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- Committer: Teddy Hogeborn
- Date: 2012-06-06 19:08:17 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120606190817-c2x5o98vzn07xufd
* plugins.d/mandos-client.c: Refactoring.
(uid, gid): New global variables.
(raise_privileges, raise_privileges_permanently, lower_privileges,
bring_up_interface): New functions.
(main): Changed to use new functions.
(uid, gid): New global variables.
(raise_privileges, raise_privileges_permanently, lower_privileges,
bring_up_interface): New functions.
(main): Changed to use new functions.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
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() */
55
64
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
58
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
69
SIOCSIFFLAGS, if_indextoname(),
60
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
61
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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 */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
67
79
#include <argp.h> /* struct argp_option, error_t, struct
68
80
argp_state, struct argp,
69
81
argp_parse(), ARGP_KEY_ARG,
70
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
71
95
72
96
/* Avahi */
73
97
/* All Avahi types, constants and functions
86
110
gnutls_*
87
111
init_gnutls_session(),
88
112
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
91
116
92
117
/* GPGME */
93
118
#include <gpgme.h> /* All GPGME types, constants and
98
123
99
124
#define BUFFER_SIZE 256
100
125
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
101
131
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
132
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
106
151
107
152
/* Used for passing in values through the Avahi callback functions */
108
153
typedef struct {
112
157
unsigned int dh_bits;
113
158
gnutls_dh_params_t dh_params;
114
159
const char *priority;
160
gpgme_ctx_t ctx;
161
server *current_server;
115
162
} mandos_context;
116
163
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
169
170
sig_atomic_t quit_now = 0;
171
int signal_received = 0;
172
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
117
192
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
* bytes. "buffer_capacity" is how much is currently allocated,
120
195
* "buffer_length" is how much is already used.
121
196
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
197
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
201
if(buffer == NULL){
127
202
return 0;
128
203
}
129
204
buffer_capacity += BUFFER_SIZE;
131
206
return buffer_capacity;
132
207
}
133
208
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
134
246
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
247
* Initialize GPGME.
137
248
*/
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;
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
144
251
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
252
gpgme_engine_info_t engine_info;
149
253
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
255
/*
256
* Helper function to insert pub and seckey to the engine keyring.
257
*/
258
bool import_key(const char *filename){
259
int ret;
260
int fd;
261
gpgme_data_t pgp_data;
262
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
if(fd == -1){
265
perror_plus("open");
266
return false;
267
}
268
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
273
return false;
274
}
275
276
rc = gpgme_op_import(mc.ctx, pgp_data);
277
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
280
return false;
281
}
282
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
if(ret == -1){
285
perror_plus("close");
286
}
287
gpgme_data_release(pgp_data);
288
return true;
289
}
290
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
152
293
}
153
294
154
295
/* Init GPGME */
155
296
gpgme_check_version(NULL);
156
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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;
298
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
301
return false;
161
302
}
162
303
163
304
/* Set GPGME home directory for the OpenPGP engine only */
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;
305
rc = gpgme_get_engine_info(&engine_info);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
309
return false;
169
310
}
170
311
while(engine_info != NULL){
171
312
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
313
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
314
engine_info->file_name, tempdir);
174
315
break;
175
316
}
176
317
engine_info = engine_info->next;
177
318
}
178
319
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
322
return false;
323
}
324
325
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc.ctx));
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
331
return false;
332
}
333
334
if(not import_key(pubkey) or not import_key(seckey)){
335
return false;
336
}
337
338
return true;
339
}
340
341
/*
342
* Decrypt OpenPGP data.
343
* Returns -1 on error
344
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext){
348
gpgme_data_t dh_crypto, dh_plain;
349
gpgme_error_t rc;
350
ssize_t ret;
351
size_t plaintext_capacity = 0;
352
ssize_t plaintext_length = 0;
353
354
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
356
}
182
357
183
358
/* Create new GPGME data buffer from memory cryptotext */
184
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
360
0);
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));
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
189
364
return -1;
190
365
}
191
366
192
367
/* Create new empty GPGME data buffer for the plaintext */
193
368
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
369
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
197
373
gpgme_data_release(dh_crypto);
198
374
return -1;
199
375
}
200
376
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
210
377
/* Decrypt data from the cryptotext data buffer to the plaintext
211
378
data buffer */
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));
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
216
383
plaintext_length = -1;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
384
if(debug){
385
gpgme_decrypt_result_t result;
386
result = gpgme_op_decrypt_result(mc.ctx);
387
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
394
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
396
}
397
gpgme_recipient_t recipient;
398
recipient = result->recipients;
240
399
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
247
407
recipient = recipient->next;
248
408
}
249
409
}
250
410
}
411
goto decrypt_end;
412
}
413
414
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
251
416
}
252
417
253
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
256
421
plaintext_length = -1;
257
422
goto decrypt_end;
258
423
}
259
424
260
425
*plaintext = NULL;
261
426
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
goto decrypt_end;
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
430
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
269
434
}
270
435
271
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
437
BUFFER_SIZE);
273
438
/* Print the data, if any */
274
if (ret == 0){
439
if(ret == 0){
275
440
/* EOF */
276
441
break;
277
442
}
278
443
if(ret < 0){
279
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
280
445
plaintext_length = -1;
281
446
goto decrypt_end;
282
447
}
283
448
plaintext_length += ret;
284
449
}
285
450
286
451
if(debug){
287
fprintf(stderr, "Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
288
453
for(ssize_t i = 0; i < plaintext_length; i++){
289
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
290
455
}
301
466
return plaintext_length;
302
467
}
303
468
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
307
473
ret = "(unknown)";
308
474
return ret;
309
475
}
311
477
/* GnuTLS log function callback */
312
478
static void debuggnutls(__attribute__((unused)) int level,
313
479
const char* string){
314
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
315
481
}
316
482
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
483
static int init_gnutls_global(const char *pubkeyfilename,
319
484
const char *seckeyfilename){
320
485
int ret;
321
486
322
487
if(debug){
323
fprintf(stderr, "Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
324
489
}
325
490
326
491
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
330
495
return -1;
331
496
}
332
497
333
if (debug){
498
if(debug){
334
499
/* "Use a log level over 10 to enable all debugging options."
335
500
* - GnuTLS manual
336
501
*/
339
504
}
340
505
341
506
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
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();
347
512
return -1;
348
513
}
349
514
350
515
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
353
seckeyfilename);
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
354
520
}
355
521
356
522
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
358
524
GNUTLS_OPENPGP_FMT_BASE64);
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));
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));
365
531
goto globalfail;
366
532
}
367
533
368
534
/* GnuTLS server initialization */
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
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
384
551
return 0;
385
552
386
553
globalfail:
387
388
gnutls_certificate_free_credentials(mc->cred);
554
555
gnutls_certificate_free_credentials(mc.cred);
389
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
390
558
return -1;
391
392
559
}
393
560
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
561
static int init_gnutls_session(gnutls_session_t *session){
396
562
int ret;
397
563
/* GnuTLS session creation */
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));
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));
402
574
}
403
575
404
576
{
405
577
const char *err;
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);
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);
412
590
return -1;
413
591
}
414
592
}
415
593
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);
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);
422
606
return -1;
423
607
}
424
608
425
609
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
428
611
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
430
613
431
614
return 0;
432
615
}
438
621
/* Called when a Mandos server is found */
439
622
static int start_mandos_communication(const char *ip, uint16_t port,
440
623
AvahiIfIndex if_index,
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
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;
444
631
char *buffer = NULL;
445
char *decrypted_buffer;
632
char *decrypted_buffer = NULL;
446
633
size_t buffer_length = 0;
447
634
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
449
635
size_t written;
450
int retval = 0;
451
char interface[IF_NAMESIZE];
636
int retval = -1;
452
637
gnutls_session_t session;
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);
476
}
477
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
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;
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
PRIu16 "\n", ip, 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;
681
}
682
683
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;
486
696
}
487
697
if(ret == 0){
488
fprintf(stderr, "Bad address: %s\n", ip);
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
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); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
711
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
715
goto mandos_end;
716
}
717
/* Set the network interface number as scope */
718
to.in6.sin6_scope_id = (uint32_t)if_index;
719
}
720
} else {
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
}
492
725
493
to.in6.sin6_scope_id = (uint32_t)if_index;
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
494
730
495
731
if(debug){
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");
732
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
char interface[IF_NAMESIZE];
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
736
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
739
}
740
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
743
}
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
const char *pcret;
747
if(af == AF_INET6){
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
750
} else {
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
753
}
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
502
756
} else {
503
757
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
505
759
}
506
760
}
507
761
}
508
762
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
511
perror("connect");
512
return -1;
513
}
514
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
if(af == AF_INET6){
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
} else {
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
}
773
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
785
}
786
515
787
const char *out = mandos_protocol_version;
516
788
written = 0;
517
while (true){
789
while(true){
518
790
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
521
if (ret == -1){
522
perror("write");
523
retval = -1;
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
793
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
524
797
goto mandos_end;
525
798
}
526
799
written += (size_t)ret;
527
800
if(written < out_size){
528
801
continue;
529
802
} else {
530
if (out == mandos_protocol_version){
803
if(out == mandos_protocol_version){
531
804
written = 0;
532
805
out = "\r\n";
533
806
} else {
534
807
break;
535
808
}
536
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
537
815
}
538
816
539
817
if(debug){
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);
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
819
}
820
821
if(quit_now){
822
errno = EINTR;
823
goto mandos_end;
824
}
825
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
837
do {
838
ret = gnutls_handshake(session);
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
547
843
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
844
549
if (ret != GNUTLS_E_SUCCESS){
845
if(ret != GNUTLS_E_SUCCESS){
550
846
if(debug){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
848
gnutls_perror(ret);
553
849
}
554
retval = -1;
850
errno = EPROTO;
555
851
goto mandos_end;
556
852
}
557
853
558
854
/* Read OpenPGP packet that contains the wanted password */
559
855
560
856
if(debug){
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
ip);
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
563
859
}
564
860
565
861
while(true){
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){
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
870
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
874
goto mandos_end;
875
}
876
877
if(quit_now){
878
errno = EINTR;
879
goto mandos_end;
880
}
881
882
sret = gnutls_record_recv(session, buffer+buffer_length,
883
BUFFER_SIZE);
884
if(sret == 0){
577
885
break;
578
886
}
579
if (ret < 0){
580
switch(ret){
887
if(sret < 0){
888
switch(sret){
581
889
case GNUTLS_E_INTERRUPTED:
582
890
case GNUTLS_E_AGAIN:
583
891
break;
584
892
case GNUTLS_E_REHANDSHAKE:
585
do{
586
ret = gnutls_handshake (session);
893
do {
894
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
587
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
591
retval = -1;
901
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
904
gnutls_perror(ret);
905
errno = EPROTO;
592
906
goto mandos_end;
593
907
}
594
908
break;
595
909
default:
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);
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
600
914
goto mandos_end;
601
915
}
602
916
} else {
603
buffer_length += (size_t) ret;
917
buffer_length += (size_t) sret;
604
918
}
605
919
}
606
920
607
921
if(debug){
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){
922
fprintf_plus(stderr, "Closing TLS session\n");
923
}
924
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
930
do {
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
if(quit_now){
933
errno = EINTR;
934
goto mandos_end;
935
}
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
937
938
if(buffer_length > 0){
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
941
&decrypted_buffer);
942
if(decrypted_buffer_size >= 0){
943
619
944
written = 0;
620
945
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
ret = (int)fwrite(decrypted_buffer + written, 1,
952
(size_t)decrypted_buffer_size - written,
953
stdout);
624
954
if(ret == 0 and ferror(stdout)){
955
int e = errno;
625
956
if(debug){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
627
strerror(errno));
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
628
959
}
629
retval = -1;
630
break;
960
errno = e;
961
goto mandos_end;
631
962
}
632
963
written += (size_t)ret;
633
964
}
634
free(decrypted_buffer);
635
} else {
636
retval = -1;
965
retval = 0;
637
966
}
638
967
}
639
968
640
969
/* Shutdown procedure */
641
970
642
971
mandos_end:
643
free(buffer);
644
close(tcp_sd);
645
gnutls_deinit (session);
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
991
}
646
992
return retval;
647
993
}
648
994
649
995
static void resolve_callback(AvahiSServiceResolver *r,
650
996
AvahiIfIndex interface,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
997
AvahiProtocol proto,
652
998
AvahiResolverEvent event,
653
999
const char *name,
654
1000
const char *type,
659
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
660
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
661
1007
flags,
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
665
1010
666
1011
/* Called whenever a service has been resolved successfully or
667
1012
timed out */
668
1013
669
switch (event) {
1014
if(quit_now){
1015
return;
1016
}
1017
1018
switch(event){
670
1019
default:
671
1020
case AVAHI_RESOLVER_FAILURE:
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
674
avahi_strerror(avahi_server_errno(mc->server)));
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
675
1025
break;
676
1026
677
1027
case AVAHI_RESOLVER_FOUND:
679
1029
char ip[AVAHI_ADDRESS_STR_MAX];
680
1030
avahi_address_snprint(ip, sizeof(ip), address);
681
1031
if(debug){
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
685
1035
}
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1038
if(ret == 0){
1039
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
689
1046
}
690
1047
}
691
1048
}
692
1049
avahi_s_service_resolver_free(r);
693
1050
}
694
1051
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
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
assert(b);
707
1063
708
1064
/* Called whenever a new services becomes available on the LAN or
709
1065
is removed from the LAN */
710
1066
711
switch (event) {
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
712
1072
default:
713
1073
case AVAHI_BROWSER_FAILURE:
714
1074
715
fprintf(stderr, "(Avahi browser) %s\n",
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
718
1078
return;
719
1079
720
1080
case AVAHI_BROWSER_NEW:
723
1083
the callback function is called the Avahi server will free the
724
1084
resolver for us. */
725
1085
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
protocol, name, type, domain,
728
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
731
name, avahi_strerror(avahi_server_errno(mc->server)));
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
732
1092
break;
733
1093
734
1094
case AVAHI_BROWSER_REMOVE:
737
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
738
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
739
1099
if(debug){
740
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
741
1102
}
742
1103
break;
743
1104
}
744
1105
}
745
1106
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
1109
if(quit_now){
1110
return;
1111
}
1112
quit_now = 1;
1113
signal_received = sig;
1114
int old_errno = errno;
1115
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1118
}
1119
errno = old_errno;
1120
}
1121
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int ret;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1569
if(if_index == 0){
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
return EX_UNAVAILABLE;
1572
}
1573
1574
if(quit_now){
1575
return EINTR;
1576
}
1577
1578
/* Re-raise priviliges */
1579
raise_privileges();
1580
1581
#ifdef __linux__
1582
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1583
messages about the network interface to mess up the prompt */
1584
ret = klogctl(8, NULL, 5);
1585
bool restore_loglevel = true;
1586
if(ret == -1){
1587
restore_loglevel = false;
1588
perror_plus("klogctl");
1589
}
1590
#endif /* __linux__ */
1591
1592
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1593
if(sd < 0){
1594
perror_plus("socket");
1595
#ifdef __linux__
1596
if(restore_loglevel){
1597
ret = klogctl(7, NULL, 0);
1598
if(ret == -1){
1599
perror_plus("klogctl");
1600
}
1601
}
1602
#endif /* __linux__ */
1603
/* Lower privileges */
1604
lower_privileges();
1605
return EX_OSERR;
1606
;
1607
}
1608
strcpy(network.ifr_name, interface);
1609
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1610
if(ret == -1){
1611
perror_plus("ioctl SIOCGIFFLAGS");
1612
#ifdef __linux__
1613
if(restore_loglevel){
1614
ret = klogctl(7, NULL, 0);
1615
if(ret == -1){
1616
perror_plus("klogctl");
1617
}
1618
}
1619
#endif /* __linux__ */
1620
/* Lower privileges */
1621
lower_privileges();
1622
return EX_OSERR;
1623
}
1624
if((network.ifr_flags & IFF_UP) == 0){
1625
network.ifr_flags |= IFF_UP;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1629
#ifdef __linux__
1630
if(restore_loglevel){
1631
ret = klogctl(7, NULL, 0);
1632
if(ret == -1){
1633
perror_plus("klogctl");
1634
}
1635
}
1636
#endif /* __linux__ */
1637
/* Lower privileges */
1638
lower_privileges();
1639
return EX_OSERR;
1640
}
1641
}
1642
/* Sleep checking until interface is running.
1643
Check every 0.25s, up to total time of delay */
1644
for(int i=0; i < delay * 4; i++){
1645
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1646
if(ret == -1){
1647
perror_plus("ioctl SIOCGIFFLAGS");
1648
} else if(network.ifr_flags & IFF_RUNNING){
1649
break;
1650
}
1651
struct timespec sleeptime = { .tv_nsec = 250000000 };
1652
ret = nanosleep(&sleeptime, NULL);
1653
if(ret == -1 and errno != EINTR){
1654
perror_plus("nanosleep");
1655
}
1656
}
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
#ifdef __linux__
1663
if(restore_loglevel){
1664
/* Restores kernel loglevel to default */
1665
ret = klogctl(7, NULL, 0);
1666
if(ret == -1){
1667
perror_plus("klogctl");
1668
}
1669
}
1670
#endif /* __linux__ */
1671
/* Lower privileges */
1672
lower_privileges();
1673
return errno;
1674
}
1675
1676
int main(int argc, char *argv[]){
1677
AvahiSServiceBrowser *sb = NULL;
1678
int error;
1679
int ret;
1680
intmax_t tmpmax;
749
1681
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
755
}
756
757
758
int main(int argc, char *argv[]){
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
853
}
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1682
int exitcode = EXIT_SUCCESS;
1683
const char *interface = "";
1684
struct ifreq network;
1685
int sd = -1;
1686
bool take_down_interface = false;
1687
char tempdir[] = "/tmp/mandosXXXXXX";
1688
bool tempdir_created = false;
1689
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1690
const char *seckey = PATHDIR "/" SECKEY;
1691
const char *pubkey = PATHDIR "/" PUBKEY;
1692
1693
bool gnutls_initialized = false;
1694
bool gpgme_initialized = false;
1695
float delay = 2.5f;
1696
double retry_interval = 10; /* 10s between trying a server and
1697
retrying the same server again */
1698
1699
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1700
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1701
1702
uid = getuid();
1703
gid = getgid();
1704
1705
/* Lower any group privileges we might have, just to be safe */
1706
errno = 0;
1707
ret = setgid(gid);
1708
if(ret == -1){
1709
perror_plus("setgid");
1710
}
1711
1712
/* Lower user privileges (temporarily) */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
1719
if(quit_now){
1720
goto end;
1721
}
1722
1723
{
1724
struct argp_option options[] = {
1725
{ .name = "debug", .key = 128,
1726
.doc = "Debug mode", .group = 3 },
1727
{ .name = "connect", .key = 'c',
1728
.arg = "ADDRESS:PORT",
1729
.doc = "Connect directly to a specific Mandos server",
1730
.group = 1 },
1731
{ .name = "interface", .key = 'i',
1732
.arg = "NAME",
1733
.doc = "Network interface that will be used to search for"
1734
" Mandos servers",
1735
.group = 1 },
1736
{ .name = "seckey", .key = 's',
1737
.arg = "FILE",
1738
.doc = "OpenPGP secret key file base name",
1739
.group = 1 },
1740
{ .name = "pubkey", .key = 'p',
1741
.arg = "FILE",
1742
.doc = "OpenPGP public key file base name",
1743
.group = 2 },
1744
{ .name = "dh-bits", .key = 129,
1745
.arg = "BITS",
1746
.doc = "Bit length of the prime number used in the"
1747
" Diffie-Hellman key exchange",
1748
.group = 2 },
1749
{ .name = "priority", .key = 130,
1750
.arg = "STRING",
1751
.doc = "GnuTLS priority string for the TLS handshake",
1752
.group = 1 },
1753
{ .name = "delay", .key = 131,
1754
.arg = "SECONDS",
1755
.doc = "Maximum delay to wait for interface startup",
1756
.group = 2 },
1757
{ .name = "retry", .key = 132,
1758
.arg = "SECONDS",
1759
.doc = "Retry interval used when denied by the Mandos server",
1760
.group = 2 },
1761
{ .name = "network-hook-dir", .key = 133,
1762
.arg = "DIR",
1763
.doc = "Directory where network hooks are located",
1764
.group = 2 },
1765
/*
1766
* These reproduce what we would get without ARGP_NO_HELP
1767
*/
1768
{ .name = "help", .key = '?',
1769
.doc = "Give this help list", .group = -1 },
1770
{ .name = "usage", .key = -3,
1771
.doc = "Give a short usage message", .group = -1 },
1772
{ .name = "version", .key = 'V',
1773
.doc = "Print program version", .group = -1 },
1774
{ .name = NULL }
1775
};
1776
1777
error_t parse_opt(int key, char *arg,
1778
struct argp_state *state){
1779
errno = 0;
1780
switch(key){
1781
case 128: /* --debug */
1782
debug = true;
1783
break;
1784
case 'c': /* --connect */
1785
connect_to = arg;
1786
break;
1787
case 'i': /* --interface */
1788
interface = arg;
1789
break;
1790
case 's': /* --seckey */
1791
seckey = arg;
1792
break;
1793
case 'p': /* --pubkey */
1794
pubkey = arg;
1795
break;
1796
case 129: /* --dh-bits */
1797
errno = 0;
1798
tmpmax = strtoimax(arg, &tmp, 10);
1799
if(errno != 0 or tmp == arg or *tmp != '\0'
1800
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1801
argp_error(state, "Bad number of DH bits");
1802
}
1803
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1804
break;
1805
case 130: /* --priority */
1806
mc.priority = arg;
1807
break;
1808
case 131: /* --delay */
1809
errno = 0;
1810
delay = strtof(arg, &tmp);
1811
if(errno != 0 or tmp == arg or *tmp != '\0'){
1812
argp_error(state, "Bad delay");
1813
}
1814
case 132: /* --retry */
1815
errno = 0;
1816
retry_interval = strtod(arg, &tmp);
1817
if(errno != 0 or tmp == arg or *tmp != '\0'
1818
or (retry_interval * 1000) > INT_MAX
1819
or retry_interval < 0){
1820
argp_error(state, "Bad retry interval");
1821
}
1822
break;
1823
case 133: /* --network-hook-dir */
1824
hookdir = arg;
1825
break;
1826
/*
1827
* These reproduce what we would get without ARGP_NO_HELP
1828
*/
1829
case '?': /* --help */
1830
argp_state_help(state, state->out_stream,
1831
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1832
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1833
case -3: /* --usage */
1834
argp_state_help(state, state->out_stream,
1835
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1836
case 'V': /* --version */
1837
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1838
exit(argp_err_exit_status);
1839
break;
1840
default:
1841
return ARGP_ERR_UNKNOWN;
1842
}
1843
return errno;
1844
}
1845
1846
struct argp argp = { .options = options, .parser = parse_opt,
1847
.args_doc = "",
1848
.doc = "Mandos client -- Get and decrypt"
1849
" passwords from a Mandos server" };
1850
ret = argp_parse(&argp, argc, argv,
1851
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1852
switch(ret){
1853
case 0:
1854
break;
1855
case ENOMEM:
1856
default:
1857
errno = ret;
1858
perror_plus("argp_parse");
1859
exitcode = EX_OSERR;
1860
goto end;
1861
case EINVAL:
1862
exitcode = EX_USAGE;
1863
goto end;
1864
}
1865
}
1866
1867
{
1868
/* Work around Debian bug #633582:
1869
<http://bugs.debian.org/633582> */
1870
1871
/* Re-raise priviliges */
1872
if(raise_privileges() == 0){
1873
struct stat st;
1874
1875
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1876
int seckey_fd = open(seckey, O_RDONLY);
1877
if(seckey_fd == -1){
1878
perror_plus("open");
1879
} else {
1880
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1881
if(ret == -1){
1882
perror_plus("fstat");
1883
} else {
1884
if(S_ISREG(st.st_mode)
1885
and st.st_uid == 0 and st.st_gid == 0){
1886
ret = fchown(seckey_fd, uid, gid);
1887
if(ret == -1){
1888
perror_plus("fchown");
1889
}
1890
}
1891
}
1892
TEMP_FAILURE_RETRY(close(seckey_fd));
1893
}
1894
}
1895
1896
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1897
int pubkey_fd = open(pubkey, O_RDONLY);
1898
if(pubkey_fd == -1){
1899
perror_plus("open");
1900
} else {
1901
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1902
if(ret == -1){
1903
perror_plus("fstat");
1904
} else {
1905
if(S_ISREG(st.st_mode)
1906
and st.st_uid == 0 and st.st_gid == 0){
1907
ret = fchown(pubkey_fd, uid, gid);
1908
if(ret == -1){
1909
perror_plus("fchown");
1910
}
1911
}
1912
}
1913
TEMP_FAILURE_RETRY(close(pubkey_fd));
1914
}
1915
}
1916
1917
/* Lower privileges */
1918
errno = 0;
1919
ret = seteuid(uid);
1920
if(ret == -1){
1921
perror_plus("seteuid");
1922
}
1923
}
1924
}
1925
1926
/* Run network hooks */
1927
if(not run_network_hooks("start", interface, delay)){
1928
goto end;
1929
}
1930
1931
if(not debug){
1932
avahi_set_log_function(empty_log);
1933
}
1934
1935
if(interface[0] == '\0'){
1936
struct dirent **direntries;
1937
/* First look for interfaces that are up */
1938
ret = scandir(sys_class_net, &direntries, up_interface,
1939
alphasort);
1940
if(ret == 0){
1941
/* No up interfaces, look for any good interfaces */
1942
free(direntries);
1943
ret = scandir(sys_class_net, &direntries, good_interface,
1944
alphasort);
1945
}
1946
if(ret >= 1){
1947
/* Pick the first interface returned */
1948
interface = strdup(direntries[0]->d_name);
1949
if(debug){
1950
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1951
}
1952
if(interface == NULL){
1953
perror_plus("malloc");
1954
free(direntries);
1955
exitcode = EXIT_FAILURE;
1956
goto end;
1957
}
1958
free(direntries);
1959
} else {
1960
free(direntries);
1961
fprintf_plus(stderr, "Could not find a network interface\n");
1962
exitcode = EXIT_FAILURE;
1963
goto end;
1964
}
1965
}
1966
1967
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1968
from the signal handler */
1969
/* Initialize the pseudo-RNG for Avahi */
1970
srand((unsigned int) time(NULL));
1971
mc.simple_poll = avahi_simple_poll_new();
1972
if(mc.simple_poll == NULL){
1973
fprintf_plus(stderr,
1974
"Avahi: Failed to create simple poll object.\n");
1975
exitcode = EX_UNAVAILABLE;
1976
goto end;
1977
}
1978
1979
sigemptyset(&sigterm_action.sa_mask);
1980
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1981
if(ret == -1){
1982
perror_plus("sigaddset");
1983
exitcode = EX_OSERR;
1984
goto end;
1985
}
1986
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1987
if(ret == -1){
1988
perror_plus("sigaddset");
1989
exitcode = EX_OSERR;
1990
goto end;
1991
}
1992
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1993
if(ret == -1){
1994
perror_plus("sigaddset");
1995
exitcode = EX_OSERR;
1996
goto end;
1997
}
1998
/* Need to check if the handler is SIG_IGN before handling:
1999
| [[info:libc:Initial Signal Actions]] |
2000
| [[info:libc:Basic Signal Handling]] |
2001
*/
2002
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2003
if(ret == -1){
2004
perror_plus("sigaction");
2005
return EX_OSERR;
2006
}
2007
if(old_sigterm_action.sa_handler != SIG_IGN){
2008
ret = sigaction(SIGINT, &sigterm_action, NULL);
2009
if(ret == -1){
2010
perror_plus("sigaction");
2011
exitcode = EX_OSERR;
2012
goto end;
2013
}
2014
}
2015
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2016
if(ret == -1){
2017
perror_plus("sigaction");
2018
return EX_OSERR;
2019
}
2020
if(old_sigterm_action.sa_handler != SIG_IGN){
2021
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2022
if(ret == -1){
2023
perror_plus("sigaction");
2024
exitcode = EX_OSERR;
2025
goto end;
2026
}
2027
}
2028
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2029
if(ret == -1){
2030
perror_plus("sigaction");
2031
return EX_OSERR;
2032
}
2033
if(old_sigterm_action.sa_handler != SIG_IGN){
2034
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2035
if(ret == -1){
2036
perror_plus("sigaction");
2037
exitcode = EX_OSERR;
2038
goto end;
2039
}
2040
}
2041
2042
/* If the interface is down, bring it up */
2043
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2044
ret = bring_up_interface(interface, delay);
2045
if(ret){
2046
errno = ret;
2047
perror_plus("Failed to bring up interface");
2048
}
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
ret = init_gnutls_global(pubkey, seckey);
2056
if(ret == -1){
2057
fprintf_plus(stderr, "init_gnutls_global failed\n");
2058
exitcode = EX_UNAVAILABLE;
2059
goto end;
2060
} else {
2061
gnutls_initialized = true;
2062
}
2063
2064
if(quit_now){
2065
goto end;
2066
}
2067
2068
if(mkdtemp(tempdir) == NULL){
2069
perror_plus("mkdtemp");
2070
goto end;
2071
}
2072
tempdir_created = true;
2073
2074
if(quit_now){
2075
goto end;
2076
}
2077
2078
if(not init_gpgme(pubkey, seckey, tempdir)){
2079
fprintf_plus(stderr, "init_gpgme failed\n");
2080
exitcode = EX_UNAVAILABLE;
2081
goto end;
2082
} else {
2083
gpgme_initialized = true;
2084
}
2085
2086
if(quit_now){
2087
goto end;
2088
}
2089
2090
if(connect_to != NULL){
2091
/* Connect directly, do not use Zeroconf */
2092
/* (Mainly meant for debugging) */
2093
char *address = strrchr(connect_to, ':');
2094
2095
if(address == NULL){
2096
fprintf_plus(stderr, "No colon in address\n");
2097
exitcode = EX_USAGE;
2098
goto end;
2099
}
2100
2101
if(quit_now){
2102
goto end;
2103
}
2104
2105
uint16_t port;
2106
errno = 0;
2107
tmpmax = strtoimax(address+1, &tmp, 10);
2108
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2109
or tmpmax != (uint16_t)tmpmax){
2110
fprintf_plus(stderr, "Bad port number\n");
2111
exitcode = EX_USAGE;
2112
goto end;
2113
}
2114
2115
if(quit_now){
2116
goto end;
2117
}
2118
2119
port = (uint16_t)tmpmax;
2120
*address = '\0';
2121
/* Colon in address indicates IPv6 */
2122
int af;
2123
if(strchr(connect_to, ':') != NULL){
2124
af = AF_INET6;
2125
/* Accept [] around IPv6 address - see RFC 5952 */
2126
if(connect_to[0] == '[' and address[-1] == ']')
2127
{
2128
connect_to++;
2129
address[-1] = '\0';
2130
}
2131
} else {
2132
af = AF_INET;
2133
}
2134
address = connect_to;
2135
2136
if(quit_now){
2137
goto end;
2138
}
2139
2140
while(not quit_now){
2141
ret = start_mandos_communication(address, port, if_index, af);
2142
if(quit_now or ret == 0){
2143
break;
2144
}
2145
if(debug){
2146
fprintf_plus(stderr, "Retrying in %d seconds\n",
2147
(int)retry_interval);
2148
}
2149
sleep((int)retry_interval);
2150
}
2151
2152
if (not quit_now){
2153
exitcode = EXIT_SUCCESS;
2154
}
2155
2156
goto end;
2157
}
2158
2159
if(quit_now){
2160
goto end;
2161
}
2162
2163
{
2164
AvahiServerConfig config;
2165
/* Do not publish any local Zeroconf records */
2166
avahi_server_config_init(&config);
2167
config.publish_hinfo = 0;
2168
config.publish_addresses = 0;
2169
config.publish_workstation = 0;
2170
config.publish_domain = 0;
2171
2172
/* Allocate a new server */
2173
mc.server = avahi_server_new(avahi_simple_poll_get
2174
(mc.simple_poll), &config, NULL,
2175
NULL, &error);
2176
2177
/* Free the Avahi configuration data */
2178
avahi_server_config_free(&config);
2179
}
2180
2181
/* Check if creating the Avahi server object succeeded */
2182
if(mc.server == NULL){
2183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2184
avahi_strerror(error));
2185
exitcode = EX_UNAVAILABLE;
2186
goto end;
2187
}
2188
2189
if(quit_now){
2190
goto end;
2191
}
2192
2193
/* Create the Avahi service browser */
2194
sb = avahi_s_service_browser_new(mc.server, if_index,
2195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2196
NULL, 0, browse_callback, NULL);
2197
if(sb == NULL){
2198
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2199
avahi_strerror(avahi_server_errno(mc.server)));
2200
exitcode = EX_UNAVAILABLE;
2201
goto end;
2202
}
2203
2204
if(quit_now){
2205
goto end;
2206
}
2207
2208
/* Run the main loop */
2209
2210
if(debug){
2211
fprintf_plus(stderr, "Starting Avahi loop search\n");
2212
}
2213
2214
ret = avahi_loop_with_timeout(mc.simple_poll,
2215
(int)(retry_interval * 1000));
2216
if(debug){
2217
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2218
(ret == 0) ? "successfully" : "with error");
2219
}
2220
2221
end:
2222
2223
if(debug){
2224
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2225
}
2226
2227
/* Cleanup things */
2228
if(sb != NULL)
2229
avahi_s_service_browser_free(sb);
2230
2231
if(mc.server != NULL)
2232
avahi_server_free(mc.server);
2233
2234
if(mc.simple_poll != NULL)
2235
avahi_simple_poll_free(mc.simple_poll);
2236
2237
if(gnutls_initialized){
2238
gnutls_certificate_free_credentials(mc.cred);
2239
gnutls_global_deinit();
2240
gnutls_dh_params_deinit(mc.dh_params);
2241
}
2242
2243
if(gpgme_initialized){
2244
gpgme_release(mc.ctx);
2245
}
2246
2247
/* Cleans up the circular linked list of Mandos servers the client
2248
has seen */
2249
if(mc.current_server != NULL){
2250
mc.current_server->prev->next = NULL;
2251
while(mc.current_server != NULL){
2252
server *next = mc.current_server->next;
2253
free(mc.current_server);
2254
mc.current_server = next;
2255
}
2256
}
2257
2258
/* Run network hooks */
2259
run_network_hooks("stop", interface, delay);
2260
2261
/* Re-raise priviliges */
2262
{
2263
raise_privileges();
2264
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
901
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
902
2268
if(ret == -1){
903
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
909
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
2273
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
if(if_index == 0){
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1027
end:
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
}
2276
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2280
}
2281
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2289
2290
/* Removes the GPGME temp directory and all files inside */
2291
if(tempdir_created){
2292
struct dirent **direntries = NULL;
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2295
alphasort);
2296
if (numentries > 0){
2297
for(int i = 0; i < numentries; i++){
2298
direntry = direntries[i];
2299
char *fullname = NULL;
2300
ret = asprintf(&fullname, "%s/%s", tempdir,
2301
direntry->d_name);
2302
if(ret < 0){
2303
perror_plus("asprintf");
2304
continue;
2305
}
2306
ret = remove(fullname);
2307
if(ret == -1){
2308
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2309
strerror(errno));
2310
}
2311
free(fullname);
2312
}
2313
}
2314
2315
/* need to clean even if 0 because man page doesn't specify */
2316
free(direntries);
2317
if (numentries == -1){
2318
perror_plus("scandir");
2319
}
2320
ret = rmdir(tempdir);
2321
if(ret == -1 and errno != ENOENT){
2322
perror_plus("rmdir");
2323
}
2324
}
2325
2326
if(quit_now){
2327
sigemptyset(&old_sigterm_action.sa_mask);
2328
old_sigterm_action.sa_handler = SIG_DFL;
2329
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2330
&old_sigterm_action,
2331
NULL));
2332
if(ret == -1){
2333
perror_plus("sigaction");
2334
}
2335
do {
2336
ret = raise(signal_received);
2337
} while(ret != 0 and errno == EINTR);
2338
if(ret != 0){
2339
perror_plus("raise");
2340
abort();
2341
}
2342
TEMP_FAILURE_RETRY(pause());
2343
}
2344
2345
return exitcode;
1051
2346
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0