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24.1.68
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: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:55 UTC
- mfrom: (103 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014055-pv5v6vqwb7wjmxqx
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
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
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
53
struct in6_addr, inet_pton(),
54
connect() */
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
95
#ifdef __linux__
96
#include <sys/klog.h> /* klogctl() */
97
#endif /* __linux__ */
98
71
99
72
/* Avahi */
100
73
/* All Avahi types, constants and functions
113
86
gnutls_*
114
87
init_gnutls_session(),
115
88
GNUTLS_* */
116
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
119
91
120
92
/* GPGME */
121
93
#include <gpgme.h> /* All GPGME types, constants and
126
98
127
99
#define BUFFER_SIZE 256
128
100
129
#define PATHDIR "/conf/conf.d/mandos"
130
#define SECKEY "seckey.txt"
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
134
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
135
103
static const char mandos_protocol_version[] = "1";
136
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
106
155
107
/* Used for passing in values through the Avahi callback functions */
156
108
typedef struct {
109
AvahiSimplePoll *simple_poll;
157
110
AvahiServer *server;
158
111
gnutls_certificate_credentials_t cred;
159
112
unsigned int dh_bits;
160
113
gnutls_dh_params_t dh_params;
161
114
const char *priority;
162
gpgme_ctx_t ctx;
163
server *current_server;
164
115
} mandos_context;
165
116
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
172
sig_atomic_t quit_now = 0;
173
int signal_received = 0;
174
175
/* Function to use when printing errors */
176
void perror_plus(const char *print_text){
177
int e = errno;
178
fprintf(stderr, "Mandos plugin %s: ",
179
program_invocation_short_name);
180
errno = e;
181
perror(print_text);
182
}
183
184
__attribute__((format (gnu_printf, 2, 3)))
185
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_list ap;
187
va_start (ap, format);
188
189
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
}
193
194
117
/*
195
* Make additional room in "buffer" for at least BUFFER_SIZE more
196
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
197
120
* "buffer_length" is how much is already used.
198
121
*/
199
size_t incbuffer(char **buffer, size_t buffer_length,
200
size_t buffer_capacity){
201
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
202
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
if(buffer == NULL){
126
if (buffer == NULL){
204
127
return 0;
205
128
}
206
129
buffer_capacity += BUFFER_SIZE;
208
131
return buffer_capacity;
209
132
}
210
133
211
/* Add server to set of servers to retry periodically */
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
214
int ret;
215
server *new_server = malloc(sizeof(server));
216
if(new_server == NULL){
217
perror_plus("malloc");
218
return false;
219
}
220
*new_server = (server){ .ip = strdup(ip),
221
.port = port,
222
.if_index = if_index,
223
.af = af };
224
if(new_server->ip == NULL){
225
perror_plus("strdup");
226
return false;
227
}
228
/* Special case of first server */
229
if (mc.current_server == NULL){
230
new_server->next = new_server;
231
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
234
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
237
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
244
}
245
return true;
246
}
247
248
134
/*
249
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
250
137
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
253
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
254
148
gpgme_engine_info_t engine_info;
255
149
256
/*
257
* Helper function to insert pub and seckey to the engine keyring.
258
*/
259
bool import_key(const char *filename){
260
int ret;
261
int fd;
262
gpgme_data_t pgp_data;
263
264
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
265
if(fd == -1){
266
perror_plus("open");
267
return false;
268
}
269
270
rc = gpgme_data_new_from_fd(&pgp_data, fd);
271
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
274
return false;
275
}
276
277
rc = gpgme_op_import(mc.ctx, pgp_data);
278
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
281
return false;
282
}
283
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
if(ret == -1){
286
perror_plus("close");
287
}
288
gpgme_data_release(pgp_data);
289
return true;
290
}
291
292
if(debug){
293
fprintf_plus(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
294
152
}
295
153
296
154
/* Init GPGME */
297
155
gpgme_check_version(NULL);
298
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
299
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
302
return false;
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
303
161
}
304
162
305
163
/* Set GPGME home directory for the OpenPGP engine only */
306
rc = gpgme_get_engine_info(&engine_info);
307
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
310
return false;
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
311
169
}
312
170
while(engine_info != NULL){
313
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
314
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
315
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
316
174
break;
317
175
}
318
176
engine_info = engine_info->next;
319
177
}
320
178
if(engine_info == NULL){
321
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
322
tempdir);
323
return false;
324
}
325
326
/* Create new GPGME "context" */
327
rc = gpgme_new(&(mc.ctx));
328
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
331
gpgme_strerror(rc));
332
return false;
333
}
334
335
if(not import_key(pubkey) or not import_key(seckey)){
336
return false;
337
}
338
339
return true;
340
}
341
342
/*
343
* Decrypt OpenPGP data.
344
* Returns -1 on error
345
*/
346
static ssize_t pgp_packet_decrypt(const char *cryptotext,
347
size_t crypto_size,
348
char **plaintext){
349
gpgme_data_t dh_crypto, dh_plain;
350
gpgme_error_t rc;
351
ssize_t ret;
352
size_t plaintext_capacity = 0;
353
ssize_t plaintext_length = 0;
354
355
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
357
181
}
358
182
359
183
/* Create new GPGME data buffer from memory cryptotext */
360
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
185
0);
362
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
365
189
return -1;
366
190
}
367
191
368
192
/* Create new empty GPGME data buffer for the plaintext */
369
193
rc = gpgme_data_new(&dh_plain);
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
374
197
gpgme_data_release(dh_crypto);
375
198
return -1;
376
199
}
377
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
378
210
/* Decrypt data from the cryptotext data buffer to the plaintext
379
211
data buffer */
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
384
216
plaintext_length = -1;
385
if(debug){
217
if (debug){
386
218
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
388
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
222
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
395
227
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
228
fprintf(stderr, "File name: %s\n", result->file_name);
397
229
}
398
230
gpgme_recipient_t recipient;
399
231
recipient = result->recipients;
400
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
409
242
}
410
243
}
411
244
}
413
246
}
414
247
415
248
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
250
}
418
251
419
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
422
255
plaintext_length = -1;
423
256
goto decrypt_end;
424
257
}
425
258
426
259
*plaintext = NULL;
427
260
while(true){
428
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
431
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
263
plaintext_capacity);
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
267
goto decrypt_end;
435
268
}
436
269
437
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
438
271
BUFFER_SIZE);
439
272
/* Print the data, if any */
440
if(ret == 0){
273
if (ret == 0){
441
274
/* EOF */
442
275
break;
443
276
}
444
277
if(ret < 0){
445
perror_plus("gpgme_data_read");
278
perror("gpgme_data_read");
446
279
plaintext_length = -1;
447
280
goto decrypt_end;
448
281
}
449
282
plaintext_length += ret;
450
283
}
451
284
452
285
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
286
fprintf(stderr, "Decrypted password is: ");
454
287
for(ssize_t i = 0; i < plaintext_length; i++){
455
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
289
}
467
300
return plaintext_length;
468
301
}
469
302
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
473
306
ret = "(unknown)";
474
307
return ret;
475
308
}
477
310
/* GnuTLS log function callback */
478
311
static void debuggnutls(__attribute__((unused)) int level,
479
312
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
313
fprintf(stderr, "GnuTLS: %s", string);
481
314
}
482
315
483
static int init_gnutls_global(const char *pubkeyfilename,
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
484
318
const char *seckeyfilename){
485
319
int ret;
486
320
487
321
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
322
fprintf(stderr, "Initializing GnuTLS\n");
489
323
}
490
324
491
325
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
495
329
return -1;
496
330
}
497
331
498
if(debug){
332
if (debug){
499
333
/* "Use a log level over 10 to enable all debugging options."
500
334
* - GnuTLS manual
501
335
*/
504
338
}
505
339
506
340
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
512
347
return -1;
513
348
}
514
349
515
350
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
520
354
}
521
355
522
356
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
524
358
GNUTLS_OPENPGP_FMT_BASE64);
525
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
359
if (ret != GNUTLS_E_SUCCESS) {
360
fprintf(stderr,
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
364
safer_gnutls_strerror(ret));
531
365
goto globalfail;
532
366
}
533
367
534
368
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
536
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
551
384
return 0;
552
385
553
386
globalfail:
554
555
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
556
389
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
558
390
return -1;
391
559
392
}
560
393
561
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
562
396
int ret;
563
397
/* GnuTLS session creation */
564
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
566
if(quit_now){
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
safer_gnutls_strerror(ret));
574
402
}
575
403
576
404
{
577
405
const char *err;
578
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
if(quit_now){
581
gnutls_deinit(*session);
582
return -1;
583
}
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
589
gnutls_deinit(*session);
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
590
412
return -1;
591
413
}
592
414
}
593
415
594
do {
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
597
if(quit_now){
598
gnutls_deinit(*session);
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
605
gnutls_deinit(*session);
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
606
422
return -1;
607
423
}
608
424
609
425
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
611
428
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
613
430
614
431
return 0;
615
432
}
619
436
__attribute__((unused)) const char *txt){}
620
437
621
438
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
439
static int start_mandos_communication(const char *ip, uint16_t port,
623
440
AvahiIfIndex if_index,
624
int af){
625
int ret, tcp_sd = -1;
626
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
444
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
445
char *decrypted_buffer;
633
446
size_t buffer_length = 0;
634
447
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
635
449
size_t written;
636
int retval = -1;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
637
452
gnutls_session_t session;
638
int pf; /* Protocol family */
639
640
errno = 0;
641
642
if(quit_now){
643
errno = EINTR;
644
return -1;
645
}
646
647
switch(af){
648
case AF_INET6:
649
pf = PF_INET6;
650
break;
651
case AF_INET:
652
pf = PF_INET;
653
break;
654
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
657
return -1;
658
}
659
660
ret = init_gnutls_session(&session);
661
if(ret != 0){
662
return -1;
663
}
664
665
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
668
}
669
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
675
goto mandos_end;
676
}
677
678
if(quit_now){
679
errno = EINTR;
680
goto mandos_end;
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
456
return -1;
457
}
458
459
if(debug){
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
"\n", ip, port);
462
}
463
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
466
perror("socket");
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
681
476
}
682
477
683
478
memset(&to, 0, sizeof(to));
684
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
687
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
690
}
691
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
695
goto mandos_end;
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
484
perror("inet_pton");
485
return -1;
696
486
}
697
487
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
701
goto mandos_end;
702
}
703
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
708
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
711
errno = EINVAL;
712
goto mandos_end;
713
}
714
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
716
}
717
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
721
}
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
722
492
723
if(quit_now){
724
errno = EINTR;
725
goto mandos_end;
726
}
493
to.in6.sin6_scope_id = (uint32_t)if_index;
727
494
728
495
if(debug){
729
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
730
char interface[IF_NAMESIZE];
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
perror_plus("if_indextoname");
733
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
736
}
737
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
740
}
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
501
perror("inet_ntop");
753
502
} else {
754
503
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
505
}
757
506
}
758
507
}
759
508
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
782
}
783
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
784
515
const char *out = mandos_protocol_version;
785
516
written = 0;
786
while(true){
517
while (true){
787
518
size_t out_size = strlen(out);
788
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
790
if(ret == -1){
791
int e = errno;
792
perror_plus("write");
793
errno = e;
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
794
524
goto mandos_end;
795
525
}
796
526
written += (size_t)ret;
797
527
if(written < out_size){
798
528
continue;
799
529
} else {
800
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
801
531
written = 0;
802
532
out = "\r\n";
803
533
} else {
804
534
break;
805
535
}
806
536
}
807
808
if(quit_now){
809
errno = EINTR;
810
goto mandos_end;
811
}
812
537
}
813
538
814
539
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
816
}
817
818
if(quit_now){
819
errno = EINTR;
820
goto mandos_end;
821
}
822
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
828
829
if(quit_now){
830
errno = EINTR;
831
goto mandos_end;
832
}
833
834
do {
835
ret = gnutls_handshake(session);
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
}
542
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
545
do{
546
ret = gnutls_handshake (session);
840
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
841
548
842
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
843
550
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
845
gnutls_perror(ret);
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
846
553
}
847
errno = EPROTO;
554
retval = -1;
848
555
goto mandos_end;
849
556
}
850
557
851
558
/* Read OpenPGP packet that contains the wanted password */
852
559
853
560
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
856
563
}
857
564
858
565
while(true){
859
860
if(quit_now){
861
errno = EINTR;
862
goto mandos_end;
863
}
864
865
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
867
if(buffer_capacity == 0){
868
int e = errno;
869
perror_plus("incbuffer");
870
errno = e;
871
goto mandos_end;
872
}
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
sret = gnutls_record_recv(session, buffer+buffer_length,
880
BUFFER_SIZE);
881
if(sret == 0){
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
buffer_capacity);
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
570
retval = -1;
571
goto mandos_end;
572
}
573
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
882
577
break;
883
578
}
884
if(sret < 0){
885
switch(sret){
579
if (ret < 0){
580
switch(ret){
886
581
case GNUTLS_E_INTERRUPTED:
887
582
case GNUTLS_E_AGAIN:
888
583
break;
889
584
case GNUTLS_E_REHANDSHAKE:
890
do {
891
ret = gnutls_handshake(session);
892
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
585
do{
586
ret = gnutls_handshake (session);
897
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
901
gnutls_perror(ret);
902
errno = EPROTO;
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
903
592
goto mandos_end;
904
593
}
905
594
break;
906
595
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
909
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
errno = EIO;
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
598
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
911
600
goto mandos_end;
912
601
}
913
602
} else {
914
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
915
604
}
916
605
}
917
606
918
607
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
920
}
921
922
if(quit_now){
923
errno = EINTR;
924
goto mandos_end;
925
}
926
927
do {
928
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
if(quit_now){
930
errno = EINTR;
931
goto mandos_end;
932
}
933
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
934
935
if(buffer_length > 0){
936
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
939
if(decrypted_buffer_size >= 0){
940
608
fprintf(stderr, "Closing TLS session\n");
609
}
610
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
941
619
written = 0;
942
620
while(written < (size_t) decrypted_buffer_size){
943
if(quit_now){
944
errno = EINTR;
945
goto mandos_end;
946
}
947
948
ret = (int)fwrite(decrypted_buffer + written, 1,
949
(size_t)decrypted_buffer_size - written,
950
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
951
624
if(ret == 0 and ferror(stdout)){
952
int e = errno;
953
625
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
956
628
}
957
errno = e;
958
goto mandos_end;
629
retval = -1;
630
break;
959
631
}
960
632
written += (size_t)ret;
961
633
}
962
retval = 0;
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
963
637
}
638
} else {
639
retval = -1;
964
640
}
965
641
966
642
/* Shutdown procedure */
967
643
968
644
mandos_end:
969
{
970
int e = errno;
971
free(decrypted_buffer);
972
free(buffer);
973
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
975
}
976
if(ret == -1){
977
if(e == 0){
978
e = errno;
979
}
980
perror_plus("close");
981
}
982
gnutls_deinit(session);
983
errno = e;
984
if(quit_now){
985
errno = EINTR;
986
retval = -1;
987
}
988
}
645
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
989
648
return retval;
990
649
}
991
650
992
651
static void resolve_callback(AvahiSServiceResolver *r,
993
652
AvahiIfIndex interface,
994
AvahiProtocol proto,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
995
654
AvahiResolverEvent event,
996
655
const char *name,
997
656
const char *type,
1002
661
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
662
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
663
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1006
if(r == NULL){
1007
return;
1008
}
664
void* userdata) {
665
mandos_context *mc = userdata;
666
assert(r);
1009
667
1010
668
/* Called whenever a service has been resolved successfully or
1011
669
timed out */
1012
670
1013
if(quit_now){
1014
return;
1015
}
1016
1017
switch(event){
671
switch (event) {
1018
672
default:
1019
673
case AVAHI_RESOLVER_FAILURE:
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
676
avahi_strerror(avahi_server_errno(mc->server)));
1024
677
break;
1025
678
1026
679
case AVAHI_RESOLVER_FOUND:
1028
681
char ip[AVAHI_ADDRESS_STR_MAX];
1029
682
avahi_address_snprint(ip, sizeof(ip), address);
1030
683
if(debug){
1031
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1033
host_name, ip, (intmax_t)interface, port);
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
1034
687
}
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
1037
avahi_proto_to_af(proto));
1038
if(ret == 0){
1039
avahi_simple_poll_quit(simple_poll);
1040
} else {
1041
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
1046
691
}
1047
692
}
1048
693
}
1049
694
avahi_s_service_resolver_free(r);
1050
695
}
1051
696
1052
static void browse_callback(AvahiSServiceBrowser *b,
1053
AvahiIfIndex interface,
1054
AvahiProtocol protocol,
1055
AvahiBrowserEvent event,
1056
const char *name,
1057
const char *type,
1058
const char *domain,
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1062
if(b == NULL){
1063
return;
1064
}
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
708
assert(b);
1065
709
1066
710
/* Called whenever a new services becomes available on the LAN or
1067
711
is removed from the LAN */
1068
712
1069
if(quit_now){
1070
return;
1071
}
1072
1073
switch(event){
713
switch (event) {
1074
714
default:
1075
715
case AVAHI_BROWSER_FAILURE:
1076
716
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1079
avahi_simple_poll_quit(simple_poll);
717
fprintf(stderr, "(Avahi browser) %s\n",
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
1080
720
return;
1081
721
1082
722
case AVAHI_BROWSER_NEW:
1085
725
the callback function is called the Avahi server will free the
1086
726
resolver for us. */
1087
727
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
733
name, avahi_strerror(avahi_server_errno(mc->server)));
1094
734
break;
1095
735
1096
736
case AVAHI_BROWSER_REMOVE:
1099
739
case AVAHI_BROWSER_ALL_FOR_NOW:
1100
740
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1101
741
if(debug){
1102
fprintf_plus(stderr, "No Mandos server found, still"
1103
" searching...\n");
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
743
}
1105
744
break;
1106
745
}
1107
746
}
1108
747
1109
/* Signal handler that stops main loop after SIGTERM */
1110
static void handle_sigterm(int sig){
1111
if(quit_now){
1112
return;
1113
}
1114
quit_now = 1;
1115
signal_received = sig;
1116
int old_errno = errno;
1117
/* set main loop to exit */
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1120
}
1121
errno = old_errno;
1122
}
1123
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
int ret;
1126
error_t ret_errno;
1127
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
if(s < 0){
1130
ret_errno = errno;
1131
perror_plus("socket");
1132
errno = ret_errno;
1133
return false;
1134
}
1135
strcpy(ifr->ifr_name, ifname);
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
if(ret == -1){
1138
if(debug){
1139
ret_errno = errno;
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1142
}
1143
return false;
1144
}
1145
return true;
1146
}
1147
1148
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1150
/* Reject the loopback device */
1151
if(ifr->ifr_flags & IFF_LOOPBACK){
1152
if(debug){
1153
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1154
ifname);
1155
}
1156
return false;
1157
}
1158
/* Accept point-to-point devices only if connect_to is specified */
1159
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1160
if(debug){
1161
fprintf_plus(stderr, "Accepting point-to-point interface"
1162
" \"%s\"\n", ifname);
1163
}
1164
return true;
1165
}
1166
/* Otherwise, reject non-broadcast-capable devices */
1167
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1168
if(debug){
1169
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1170
" \"%s\"\n", ifname);
1171
}
1172
return false;
1173
}
1174
/* Reject non-ARP interfaces (including dummy interfaces) */
1175
if(ifr->ifr_flags & IFF_NOARP){
1176
if(debug){
1177
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1178
ifname);
1179
}
1180
return false;
1181
}
1182
1183
/* Accept this device */
1184
if(debug){
1185
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1186
}
1187
return true;
1188
}
1189
1190
/*
1191
* This function determines if a directory entry in /sys/class/net
1192
* corresponds to an acceptable network device.
1193
* (This function is passed to scandir(3) as a filter function.)
1194
*/
1195
int good_interface(const struct dirent *if_entry){
1196
if(if_entry->d_name[0] == '.'){
1197
return 0;
1198
}
1199
1200
struct ifreq ifr;
1201
if(not get_flags(if_entry->d_name, &ifr)){
1202
if(debug){
1203
fprintf_plus(stderr, "Failed to get flags for interface "
1204
"\"%s\"\n", if_entry->d_name);
1205
}
1206
return 0;
1207
}
1208
1209
if(not good_flags(if_entry->d_name, &ifr)){
1210
return 0;
1211
}
1212
return 1;
1213
}
1214
1215
/*
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
}
1246
1247
int notdotentries(const struct dirent *direntry){
1248
/* Skip "." and ".." */
1249
if(direntry->d_name[0] == '.'
1250
and (direntry->d_name[1] == '\0'
1251
or (direntry->d_name[1] == '.'
1252
and direntry->d_name[2] == '\0'))){
1253
return 0;
1254
}
1255
return 1;
1256
}
1257
1258
/* Is this directory entry a runnable program? */
1259
int runnable_hook(const struct dirent *direntry){
1260
int ret;
1261
size_t sret;
1262
struct stat st;
1263
1264
if((direntry->d_name)[0] == '\0'){
1265
/* Empty name? */
1266
return 0;
1267
}
1268
1269
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
"abcdefghijklmnopqrstuvwxyz"
1271
"0123456789"
1272
"_-");
1273
if((direntry->d_name)[sret] != '\0'){
1274
/* Contains non-allowed characters */
1275
if(debug){
1276
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1277
direntry->d_name);
1278
}
1279
return 0;
1280
}
1281
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
1284
753
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1290
if(ret == -1){
1291
if(debug){
1292
perror_plus("Could not stat hook");
1293
}
1294
return 0;
1295
}
1296
if(not (S_ISREG(st.st_mode))){
1297
/* Not a regular file */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1305
/* Not executable */
1306
if(debug){
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
if(debug){
1313
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1314
direntry->d_name);
1315
}
1316
return 1;
754
return NULL;
755
}
756
return tmp;
1317
757
}
1318
758
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
int ret;
1321
struct timespec now;
1322
struct timespec waited_time;
1323
intmax_t block_time;
1324
1325
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1328
fprintf_plus(stderr, "Wait until first server is found."
1329
" No timeout!\n");
1330
}
1331
ret = avahi_simple_poll_iterate(s, -1);
759
760
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
855
}
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
1332
890
} else {
1333
if (debug){
1334
fprintf_plus(stderr, "Check current_server if we should run"
1335
" it, or wait\n");
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
1336
901
}
1337
/* the current time */
1338
ret = clock_gettime(CLOCK_MONOTONIC, &now);
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1339
904
if(ret == -1){
1340
perror_plus("clock_gettime");
1341
return -1;
1342
}
1343
/* Calculating in ms how long time between now and server
1344
who we visted longest time ago. Now - last seen. */
1345
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1347
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1349
/* total time is 10s/10,000ms.
1350
Converting to s from ms by dividing by 1,000,
1351
and ns to ms by dividing by 1,000,000. */
1352
block_time = ((retry_interval
1353
- ((intmax_t)waited_time.tv_sec * 1000))
1354
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1356
if (debug){
1357
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
block_time);
1359
}
1360
1361
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1366
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1368
return 0;
1369
}
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1372
912
if(ret == -1){
1373
perror_plus("clock_gettime");
1374
return -1;
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
1375
916
}
1376
mc.current_server = mc.current_server->next;
1377
block_time = 0; /* Call avahi to find new Mandos
1378
servers, but don't block */
1379
}
1380
1381
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
}
1383
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1385
return (ret != 1) ? ret : 0;
1386
}
1387
}
1388
}
1389
}
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1444
const float delay){
1445
struct dirent **direntries;
1446
struct dirent *direntry;
1447
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
917
}
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
if(if_index == 0){
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
954
goto end;
955
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
1465
959
if(ret < 0){
1466
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1525
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
960
exitcode = EXIT_FAILURE;
1537
961
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
1574
}
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
1746
}
1747
1748
int main(int argc, char *argv[]){
1749
AvahiSServiceBrowser *sb = NULL;
1750
error_t ret_errno;
1751
int ret;
1752
intmax_t tmpmax;
1753
char *tmp;
1754
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
1761
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
const char *seckey = PATHDIR "/" SECKEY;
1763
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
1767
bool gnutls_initialized = false;
1768
bool gpgme_initialized = false;
1769
float delay = 2.5f;
1770
double retry_interval = 10; /* 10s between trying a server and
1771
retrying the same server again */
1772
1773
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1774
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1775
1776
uid = getuid();
1777
gid = getgid();
1778
1779
/* Lower any group privileges we might have, just to be safe */
1780
errno = 0;
1781
ret = setgid(gid);
1782
if(ret == -1){
1783
perror_plus("setgid");
1784
}
1785
1786
/* Lower user privileges (temporarily) */
1787
errno = 0;
1788
ret = seteuid(uid);
1789
if(ret == -1){
1790
perror_plus("seteuid");
1791
}
1792
1793
if(quit_now){
1794
goto end;
1795
}
1796
1797
{
1798
struct argp_option options[] = {
1799
{ .name = "debug", .key = 128,
1800
.doc = "Debug mode", .group = 3 },
1801
{ .name = "connect", .key = 'c',
1802
.arg = "ADDRESS:PORT",
1803
.doc = "Connect directly to a specific Mandos server",
1804
.group = 1 },
1805
{ .name = "interface", .key = 'i',
1806
.arg = "NAME",
1807
.doc = "Network interface that will be used to search for"
1808
" Mandos servers",
1809
.group = 1 },
1810
{ .name = "seckey", .key = 's',
1811
.arg = "FILE",
1812
.doc = "OpenPGP secret key file base name",
1813
.group = 1 },
1814
{ .name = "pubkey", .key = 'p',
1815
.arg = "FILE",
1816
.doc = "OpenPGP public key file base name",
1817
.group = 2 },
1818
{ .name = "dh-bits", .key = 129,
1819
.arg = "BITS",
1820
.doc = "Bit length of the prime number used in the"
1821
" Diffie-Hellman key exchange",
1822
.group = 2 },
1823
{ .name = "priority", .key = 130,
1824
.arg = "STRING",
1825
.doc = "GnuTLS priority string for the TLS handshake",
1826
.group = 1 },
1827
{ .name = "delay", .key = 131,
1828
.arg = "SECONDS",
1829
.doc = "Maximum delay to wait for interface startup",
1830
.group = 2 },
1831
{ .name = "retry", .key = 132,
1832
.arg = "SECONDS",
1833
.doc = "Retry interval used when denied by the Mandos server",
1834
.group = 2 },
1835
{ .name = "network-hook-dir", .key = 133,
1836
.arg = "DIR",
1837
.doc = "Directory where network hooks are located",
1838
.group = 2 },
1839
/*
1840
* These reproduce what we would get without ARGP_NO_HELP
1841
*/
1842
{ .name = "help", .key = '?',
1843
.doc = "Give this help list", .group = -1 },
1844
{ .name = "usage", .key = -3,
1845
.doc = "Give a short usage message", .group = -1 },
1846
{ .name = "version", .key = 'V',
1847
.doc = "Print program version", .group = -1 },
1848
{ .name = NULL }
1849
};
1850
1851
error_t parse_opt(int key, char *arg,
1852
struct argp_state *state){
1853
errno = 0;
1854
switch(key){
1855
case 128: /* --debug */
1856
debug = true;
1857
break;
1858
case 'c': /* --connect */
1859
connect_to = arg;
1860
break;
1861
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1867
break;
1868
case 's': /* --seckey */
1869
seckey = arg;
1870
break;
1871
case 'p': /* --pubkey */
1872
pubkey = arg;
1873
break;
1874
case 129: /* --dh-bits */
1875
errno = 0;
1876
tmpmax = strtoimax(arg, &tmp, 10);
1877
if(errno != 0 or tmp == arg or *tmp != '\0'
1878
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1879
argp_error(state, "Bad number of DH bits");
1880
}
1881
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
break;
1883
case 130: /* --priority */
1884
mc.priority = arg;
1885
break;
1886
case 131: /* --delay */
1887
errno = 0;
1888
delay = strtof(arg, &tmp);
1889
if(errno != 0 or tmp == arg or *tmp != '\0'){
1890
argp_error(state, "Bad delay");
1891
}
1892
case 132: /* --retry */
1893
errno = 0;
1894
retry_interval = strtod(arg, &tmp);
1895
if(errno != 0 or tmp == arg or *tmp != '\0'
1896
or (retry_interval * 1000) > INT_MAX
1897
or retry_interval < 0){
1898
argp_error(state, "Bad retry interval");
1899
}
1900
break;
1901
case 133: /* --network-hook-dir */
1902
hookdir = arg;
1903
break;
1904
/*
1905
* These reproduce what we would get without ARGP_NO_HELP
1906
*/
1907
case '?': /* --help */
1908
argp_state_help(state, state->out_stream,
1909
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1910
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1911
case -3: /* --usage */
1912
argp_state_help(state, state->out_stream,
1913
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1914
case 'V': /* --version */
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1916
exit(argp_err_exit_status);
1917
break;
1918
default:
1919
return ARGP_ERR_UNKNOWN;
1920
}
1921
return errno;
1922
}
1923
1924
struct argp argp = { .options = options, .parser = parse_opt,
1925
.args_doc = "",
1926
.doc = "Mandos client -- Get and decrypt"
1927
" passwords from a Mandos server" };
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
1931
case 0:
1932
break;
1933
case ENOMEM:
1934
default:
1935
errno = ret;
1936
perror_plus("argp_parse");
1937
exitcode = EX_OSERR;
1938
goto end;
1939
case EINVAL:
1940
exitcode = EX_USAGE;
1941
goto end;
1942
}
1943
}
1944
1945
{
1946
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
1948
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
1951
struct stat st;
1952
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1954
int seckey_fd = open(seckey, O_RDONLY);
1955
if(seckey_fd == -1){
1956
perror_plus("open");
1957
} else {
1958
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1959
if(ret == -1){
1960
perror_plus("fstat");
1961
} else {
1962
if(S_ISREG(st.st_mode)
1963
and st.st_uid == 0 and st.st_gid == 0){
1964
ret = fchown(seckey_fd, uid, gid);
1965
if(ret == -1){
1966
perror_plus("fchown");
1967
}
1968
}
1969
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
1971
}
1972
}
1973
1974
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
int pubkey_fd = open(pubkey, O_RDONLY);
1976
if(pubkey_fd == -1){
1977
perror_plus("open");
1978
} else {
1979
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1980
if(ret == -1){
1981
perror_plus("fstat");
1982
} else {
1983
if(S_ISREG(st.st_mode)
1984
and st.st_uid == 0 and st.st_gid == 0){
1985
ret = fchown(pubkey_fd, uid, gid);
1986
if(ret == -1){
1987
perror_plus("fchown");
1988
}
1989
}
1990
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
1995
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2000
}
2001
}
2002
}
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
2020
/* Run network hooks */
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2038
}
2039
2040
if(not debug){
2041
avahi_set_log_function(empty_log);
2042
}
2043
2044
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2045
from the signal handler */
2046
/* Initialize the pseudo-RNG for Avahi */
2047
srand((unsigned int) time(NULL));
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
2050
fprintf_plus(stderr,
2051
"Avahi: Failed to create simple poll object.\n");
2052
exitcode = EX_UNAVAILABLE;
2053
goto end;
2054
}
2055
2056
sigemptyset(&sigterm_action.sa_mask);
2057
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2058
if(ret == -1){
2059
perror_plus("sigaddset");
2060
exitcode = EX_OSERR;
2061
goto end;
2062
}
2063
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2064
if(ret == -1){
2065
perror_plus("sigaddset");
2066
exitcode = EX_OSERR;
2067
goto end;
2068
}
2069
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2070
if(ret == -1){
2071
perror_plus("sigaddset");
2072
exitcode = EX_OSERR;
2073
goto end;
2074
}
2075
/* Need to check if the handler is SIG_IGN before handling:
2076
| [[info:libc:Initial Signal Actions]] |
2077
| [[info:libc:Basic Signal Handling]] |
2078
*/
2079
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2080
if(ret == -1){
2081
perror_plus("sigaction");
2082
return EX_OSERR;
2083
}
2084
if(old_sigterm_action.sa_handler != SIG_IGN){
2085
ret = sigaction(SIGINT, &sigterm_action, NULL);
2086
if(ret == -1){
2087
perror_plus("sigaction");
2088
exitcode = EX_OSERR;
2089
goto end;
2090
}
2091
}
2092
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2093
if(ret == -1){
2094
perror_plus("sigaction");
2095
return EX_OSERR;
2096
}
2097
if(old_sigterm_action.sa_handler != SIG_IGN){
2098
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2099
if(ret == -1){
2100
perror_plus("sigaction");
2101
exitcode = EX_OSERR;
2102
goto end;
2103
}
2104
}
2105
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2106
if(ret == -1){
2107
perror_plus("sigaction");
2108
return EX_OSERR;
2109
}
2110
if(old_sigterm_action.sa_handler != SIG_IGN){
2111
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2112
if(ret == -1){
2113
perror_plus("sigaction");
2114
exitcode = EX_OSERR;
2115
goto end;
2116
}
2117
}
2118
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
2140
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
2174
}
2175
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
}
2182
}
2183
2184
if(quit_now){
2185
goto end;
2186
}
2187
2188
ret = init_gnutls_global(pubkey, seckey);
2189
if(ret == -1){
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
exitcode = EX_UNAVAILABLE;
2192
goto end;
2193
} else {
2194
gnutls_initialized = true;
2195
}
2196
2197
if(quit_now){
2198
goto end;
2199
}
2200
2201
if(mkdtemp(tempdir) == NULL){
2202
perror_plus("mkdtemp");
2203
goto end;
2204
}
2205
tempdir_created = true;
2206
2207
if(quit_now){
2208
goto end;
2209
}
2210
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
2212
fprintf_plus(stderr, "init_gpgme failed\n");
2213
exitcode = EX_UNAVAILABLE;
2214
goto end;
2215
} else {
2216
gpgme_initialized = true;
2217
}
2218
2219
if(quit_now){
2220
goto end;
2221
}
2222
2223
if(connect_to != NULL){
2224
/* Connect directly, do not use Zeroconf */
2225
/* (Mainly meant for debugging) */
2226
char *address = strrchr(connect_to, ':');
2227
2228
if(address == NULL){
2229
fprintf_plus(stderr, "No colon in address\n");
2230
exitcode = EX_USAGE;
2231
goto end;
2232
}
2233
2234
if(quit_now){
2235
goto end;
2236
}
2237
2238
in_port_t port;
2239
errno = 0;
2240
tmpmax = strtoimax(address+1, &tmp, 10);
2241
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2242
or tmpmax != (in_port_t)tmpmax){
2243
fprintf_plus(stderr, "Bad port number\n");
2244
exitcode = EX_USAGE;
2245
goto end;
2246
}
2247
2248
if(quit_now){
2249
goto end;
2250
}
2251
2252
port = (in_port_t)tmpmax;
2253
*address = '\0';
2254
/* Colon in address indicates IPv6 */
2255
int af;
2256
if(strchr(connect_to, ':') != NULL){
2257
af = AF_INET6;
2258
/* Accept [] around IPv6 address - see RFC 5952 */
2259
if(connect_to[0] == '[' and address[-1] == ']')
2260
{
2261
connect_to++;
2262
address[-1] = '\0';
2263
}
2264
} else {
2265
af = AF_INET;
2266
}
2267
address = connect_to;
2268
2269
if(quit_now){
2270
goto end;
2271
}
2272
2273
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2275
if(quit_now or ret == 0){
2276
break;
2277
}
2278
if(debug){
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
(int)retry_interval);
2281
}
2282
sleep((int)retry_interval);
2283
}
2284
2285
if (not quit_now){
2286
exitcode = EXIT_SUCCESS;
2287
}
2288
2289
goto end;
2290
}
2291
2292
if(quit_now){
2293
goto end;
2294
}
2295
2296
{
2297
AvahiServerConfig config;
2298
/* Do not publish any local Zeroconf records */
2299
avahi_server_config_init(&config);
2300
config.publish_hinfo = 0;
2301
config.publish_addresses = 0;
2302
config.publish_workstation = 0;
2303
config.publish_domain = 0;
2304
2305
/* Allocate a new server */
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
2308
2309
/* Free the Avahi configuration data */
2310
avahi_server_config_free(&config);
2311
}
2312
2313
/* Check if creating the Avahi server object succeeded */
2314
if(mc.server == NULL){
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
2317
exitcode = EX_UNAVAILABLE;
2318
goto end;
2319
}
2320
2321
if(quit_now){
2322
goto end;
2323
}
2324
2325
/* Create the Avahi service browser */
2326
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
2329
if(sb == NULL){
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
avahi_strerror(avahi_server_errno(mc.server)));
2332
exitcode = EX_UNAVAILABLE;
2333
goto end;
2334
}
2335
2336
if(quit_now){
2337
goto end;
2338
}
2339
2340
/* Run the main loop */
2341
2342
if(debug){
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
}
2345
2346
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2348
if(debug){
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
(ret == 0) ? "successfully" : "with error");
2351
}
2352
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
2353
1029
end:
2354
2355
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2357
}
2358
2359
/* Cleanup things */
2360
if(sb != NULL)
2361
avahi_s_service_browser_free(sb);
2362
2363
if(mc.server != NULL)
2364
avahi_server_free(mc.server);
2365
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
2368
2369
if(gnutls_initialized){
2370
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2372
gnutls_dh_params_deinit(mc.dh_params);
2373
}
2374
2375
if(gpgme_initialized){
2376
gpgme_release(mc.ctx);
2377
}
2378
2379
/* Cleans up the circular linked list of Mandos servers the client
2380
has seen */
2381
if(mc.current_server != NULL){
2382
mc.current_server->prev->next = NULL;
2383
while(mc.current_server != NULL){
2384
server *next = mc.current_server->next;
2385
free(mc.current_server);
2386
mc.current_server = next;
2387
}
2388
}
2389
2390
/* Re-raise priviliges */
2391
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
2417
}
2418
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2421
2422
/* Removes the GPGME temp directory and all files inside */
2423
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
2431
char *fullname = NULL;
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
direntry->d_name);
2434
if(ret < 0){
2435
perror_plus("asprintf");
2436
continue;
2437
}
2438
ret = remove(fullname);
2439
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
2442
}
2443
free(fullname);
2444
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
2451
}
2452
ret = rmdir(tempdir);
2453
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
2455
}
2456
}
2457
2458
if(quit_now){
2459
sigemptyset(&old_sigterm_action.sa_mask);
2460
old_sigterm_action.sa_handler = SIG_DFL;
2461
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2462
&old_sigterm_action,
2463
NULL));
2464
if(ret == -1){
2465
perror_plus("sigaction");
2466
}
2467
do {
2468
ret = raise(signal_received);
2469
} while(ret != 0 and errno == EINTR);
2470
if(ret != 0){
2471
perror_plus("raise");
2472
abort();
2473
}
2474
TEMP_FAILURE_RETRY(pause());
2475
}
2476
2477
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2478
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0