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- Committer: Teddy Hogeborn
- Date: 2008-09-06 17:24:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906172458-2x5wlfkn7oqckt1y
* legalnotice.xml: Copy DocBook 4.4-formatted text from
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
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 © 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, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
68
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
62
SIOCSIFFLAGS, if_indextoname(),
70
63
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
64
#include <netinet/in.h>
74
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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 */
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
79
70
#include <argp.h> /* struct argp_option, error_t, struct
80
71
argp_state, struct argp,
81
72
argp_parse(), ARGP_KEY_ARG,
82
73
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__ */
95
74
96
75
/* Avahi */
97
76
/* All Avahi types, constants and functions
110
89
gnutls_*
111
90
init_gnutls_session(),
112
91
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
93
GNUTLS_OPENPGP_FMT_BASE64 */
116
94
117
95
/* GPGME */
118
96
#include <gpgme.h> /* All GPGME types, constants and
123
101
124
102
#define BUFFER_SIZE 256
125
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
126
108
#define PATHDIR "/conf/conf.d/mandos"
127
109
#define SECKEY "seckey.txt"
128
110
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
111
131
112
bool debug = false;
132
113
static const char mandos_protocol_version[] = "1";
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;
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
116
152
117
/* Used for passing in values through the Avahi callback functions */
153
118
typedef struct {
158
123
gnutls_dh_params_t dh_params;
159
124
const char *priority;
160
125
gpgme_ctx_t ctx;
161
server *current_server;
162
126
} mandos_context;
163
127
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
192
128
/*
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
195
131
* "buffer_length" is how much is already used.
196
132
*/
197
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
200
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
137
if (buffer == NULL){
202
138
return 0;
203
139
}
204
140
buffer_capacity += BUFFER_SIZE;
206
142
return buffer_capacity;
207
143
}
208
144
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
246
145
/*
247
146
* Initialize GPGME.
248
147
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
251
151
gpgme_error_t rc;
252
152
gpgme_engine_info_t engine_info;
253
153
254
154
255
155
/*
256
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
257
157
*/
258
158
bool import_key(const char *filename){
259
int ret;
260
159
int fd;
261
160
gpgme_data_t pgp_data;
262
161
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
163
if(fd == -1){
265
perror_plus("open");
164
perror("open");
266
165
return false;
267
166
}
268
167
269
168
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));
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
284
183
if(ret == -1){
285
perror_plus("close");
184
perror("close");
286
185
}
287
186
gpgme_data_release(pgp_data);
288
187
return true;
289
188
}
290
189
291
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
293
192
}
294
193
295
194
/* Init GPGME */
296
195
gpgme_check_version(NULL);
297
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
301
200
return false;
302
201
}
303
202
304
/* Set GPGME home directory for the OpenPGP engine only */
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));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
309
208
return false;
310
209
}
311
210
while(engine_info != NULL){
317
216
engine_info = engine_info->next;
318
217
}
319
218
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
220
return false;
323
221
}
324
222
325
223
/* 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;
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
339
236
}
340
237
341
238
/*
342
239
* Decrypt OpenPGP data.
343
240
* Returns -1 on error
344
241
*/
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
size_t crypto_size,
347
char **plaintext){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
348
246
gpgme_data_t dh_crypto, dh_plain;
349
247
gpgme_error_t rc;
350
248
ssize_t ret;
351
249
size_t plaintext_capacity = 0;
352
250
ssize_t plaintext_length = 0;
353
251
354
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
254
}
357
255
358
256
/* Create new GPGME data buffer from memory cryptotext */
359
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
258
0);
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));
259
if (rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
364
262
return -1;
365
263
}
366
264
367
265
/* Create new empty GPGME data buffer for the plaintext */
368
266
rc = gpgme_data_new(&dh_plain);
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));
267
if (rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
373
270
gpgme_data_release(dh_crypto);
374
271
return -1;
375
272
}
376
273
377
274
/* Decrypt data from the cryptotext data buffer to the plaintext
378
275
data buffer */
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));
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
383
280
plaintext_length = -1;
384
if(debug){
281
if (debug){
385
282
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");
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
286
} 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);
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
394
291
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
292
fprintf(stderr, "File name: %s\n", result->file_name);
396
293
}
397
294
gpgme_recipient_t recipient;
398
295
recipient = result->recipients;
399
while(recipient != NULL){
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");
407
recipient = recipient->next;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
408
306
}
409
307
}
410
308
}
412
310
}
413
311
414
312
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
314
}
417
315
418
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
421
319
plaintext_length = -1;
422
320
goto decrypt_end;
423
321
}
424
322
425
323
*plaintext = NULL;
426
324
while(true){
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;
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
434
332
}
435
333
436
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
437
335
BUFFER_SIZE);
438
336
/* Print the data, if any */
439
if(ret == 0){
337
if (ret == 0){
440
338
/* EOF */
441
339
break;
442
340
}
443
341
if(ret < 0){
444
perror_plus("gpgme_data_read");
342
perror("gpgme_data_read");
445
343
plaintext_length = -1;
446
344
goto decrypt_end;
447
345
}
449
347
}
450
348
451
349
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
350
fprintf(stderr, "Decrypted password is: ");
453
351
for(ssize_t i = 0; i < plaintext_length; i++){
454
352
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
353
}
466
364
return plaintext_length;
467
365
}
468
366
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)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
473
370
ret = "(unknown)";
474
371
return ret;
475
372
}
477
374
/* GnuTLS log function callback */
478
375
static void debuggnutls(__attribute__((unused)) int level,
479
376
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
377
fprintf(stderr, "GnuTLS: %s", string);
481
378
}
482
379
483
static int init_gnutls_global(const char *pubkeyfilename,
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
484
382
const char *seckeyfilename){
485
383
int ret;
486
384
487
385
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
386
fprintf(stderr, "Initializing GnuTLS\n");
489
387
}
490
388
491
389
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
495
393
return -1;
496
394
}
497
395
498
if(debug){
396
if (debug){
499
397
/* "Use a log level over 10 to enable all debugging options."
500
398
* - GnuTLS manual
501
399
*/
504
402
}
505
403
506
404
/* 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();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
512
411
return -1;
513
412
}
514
413
515
414
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);
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
417
seckeyfilename);
520
418
}
521
419
522
420
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
421
(mc->cred, pubkeyfilename, seckeyfilename,
524
422
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));
423
if (ret != GNUTLS_E_SUCCESS) {
424
fprintf(stderr,
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
428
safer_gnutls_strerror(ret));
531
429
goto globalfail;
532
430
}
533
431
534
432
/* 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));
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
540
437
goto globalfail;
541
438
}
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));
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
546
443
goto globalfail;
547
444
}
548
445
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
447
551
448
return 0;
552
449
553
450
globalfail:
554
451
555
gnutls_certificate_free_credentials(mc.cred);
452
gnutls_certificate_free_credentials(mc->cred);
556
453
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
558
454
return -1;
559
455
}
560
456
561
static int init_gnutls_session(gnutls_session_t *session){
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
562
459
int ret;
563
460
/* 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));
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
463
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
safer_gnutls_strerror(ret));
574
465
}
575
466
576
467
{
577
468
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);
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
471
fprintf(stderr, "Syntax error at: %s\n", err);
472
fprintf(stderr, "GnuTLS error: %s\n",
473
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
590
475
return -1;
591
476
}
592
477
}
593
478
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);
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
482
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
606
485
return -1;
607
486
}
608
487
609
488
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
611
491
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
613
493
614
494
return 0;
615
495
}
621
501
/* Called when a Mandos server is found */
622
502
static int start_mandos_communication(const char *ip, uint16_t port,
623
503
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;
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
631
507
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
508
char *decrypted_buffer;
633
509
size_t buffer_length = 0;
634
510
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
635
512
size_t written;
636
int retval = -1;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
637
515
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
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;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
519
return -1;
520
}
521
522
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
524
"\n", ip, port);
525
}
526
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
531
}
532
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
681
539
}
682
540
683
541
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;
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
696
549
}
697
550
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); /* 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
}
551
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
725
555
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
556
to.in6.sin6_scope_id = (uint32_t)if_index;
730
557
731
558
if(debug){
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");
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
756
565
} else {
757
566
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
567
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
568
}
760
569
}
761
570
}
762
571
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;
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
785
576
}
786
577
787
578
const char *out = mandos_protocol_version;
788
579
written = 0;
789
while(true){
580
while (true){
790
581
size_t out_size = strlen(out);
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;
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
797
587
goto mandos_end;
798
588
}
799
589
written += (size_t)ret;
800
590
if(written < out_size){
801
591
continue;
802
592
} else {
803
if(out == mandos_protocol_version){
593
if (out == mandos_protocol_version){
804
594
written = 0;
805
595
out = "\r\n";
806
596
} else {
807
597
break;
808
598
}
809
599
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
600
}
816
601
817
602
if(debug){
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
}
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
}
605
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
843
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
611
845
if(ret != GNUTLS_E_SUCCESS){
612
if (ret != GNUTLS_E_SUCCESS){
846
613
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
848
gnutls_perror(ret);
614
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
849
616
}
850
errno = EPROTO;
617
retval = -1;
851
618
goto mandos_end;
852
619
}
853
620
854
621
/* Read OpenPGP packet that contains the wanted password */
855
622
856
623
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
ip);
859
626
}
860
627
861
628
while(true){
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){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
885
640
break;
886
641
}
887
if(sret < 0){
888
switch(sret){
642
if (ret < 0){
643
switch(ret){
889
644
case GNUTLS_E_INTERRUPTED:
890
645
case GNUTLS_E_AGAIN:
891
646
break;
892
647
case GNUTLS_E_REHANDSHAKE:
893
do {
894
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
648
do{
649
ret = gnutls_handshake (session);
900
650
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
904
gnutls_perror(ret);
905
errno = EPROTO;
651
if (ret < 0){
652
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
906
655
goto mandos_end;
907
656
}
908
657
break;
909
658
default:
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;
659
fprintf(stderr, "Unknown error while reading data from"
660
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
914
663
goto mandos_end;
915
664
}
916
665
} else {
917
buffer_length += (size_t) sret;
666
buffer_length += (size_t) ret;
918
667
}
919
668
}
920
669
921
670
if(debug){
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,
671
fprintf(stderr, "Closing TLS session\n");
672
}
673
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
buffer_length,
941
679
&decrypted_buffer);
942
if(decrypted_buffer_size >= 0){
943
680
if (decrypted_buffer_size >= 0){
944
681
written = 0;
945
682
while(written < (size_t) decrypted_buffer_size){
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);
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
954
686
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
687
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
688
fprintf(stderr, "Error writing encrypted data: %s\n",
689
strerror(errno));
959
690
}
960
errno = e;
961
goto mandos_end;
691
retval = -1;
692
break;
962
693
}
963
694
written += (size_t)ret;
964
695
}
965
retval = 0;
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
966
699
}
700
} else {
701
retval = -1;
967
702
}
968
703
969
704
/* Shutdown procedure */
970
705
971
706
mandos_end:
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
}
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
991
711
}
712
gnutls_deinit (session);
992
713
return retval;
993
714
}
994
715
995
716
static void resolve_callback(AvahiSServiceResolver *r,
996
717
AvahiIfIndex interface,
997
AvahiProtocol proto,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
998
719
AvahiResolverEvent event,
999
720
const char *name,
1000
721
const char *type,
1005
726
AVAHI_GCC_UNUSED AvahiStringList *txt,
1006
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1007
728
flags,
1008
AVAHI_GCC_UNUSED void* userdata){
729
void* userdata) {
730
mandos_context *mc = userdata;
1009
731
assert(r);
1010
732
1011
733
/* Called whenever a service has been resolved successfully or
1012
734
timed out */
1013
735
1014
if(quit_now){
1015
return;
1016
}
1017
1018
switch(event){
736
switch (event) {
1019
737
default:
1020
738
case AVAHI_RESOLVER_FAILURE:
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)));
739
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
1025
742
break;
1026
743
1027
744
case AVAHI_RESOLVER_FOUND:
1029
746
char ip[AVAHI_ADDRESS_STR_MAX];
1030
747
avahi_address_snprint(ip, sizeof(ip), address);
1031
748
if(debug){
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);
749
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1035
752
}
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
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1046
756
}
1047
757
}
1048
758
}
1049
759
avahi_s_service_resolver_free(r);
1050
760
}
1051
761
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){
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
1062
773
assert(b);
1063
774
1064
775
/* Called whenever a new services becomes available on the LAN or
1065
776
is removed from the LAN */
1066
777
1067
if(quit_now){
1068
return;
1069
}
1070
1071
switch(event){
778
switch (event) {
1072
779
default:
1073
780
case AVAHI_BROWSER_FAILURE:
1074
781
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
782
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1078
785
return;
1079
786
1080
787
case AVAHI_BROWSER_NEW:
1083
790
the callback function is called the Avahi server will free the
1084
791
resolver for us. */
1085
792
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)));
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
797
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1092
799
break;
1093
800
1094
801
case AVAHI_BROWSER_REMOVE:
1097
804
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
805
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
806
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
807
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
808
}
1103
809
break;
1104
810
}
1105
811
}
1106
812
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
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1402
}
1403
errno = old_errno;
1404
return ret_errno;
1405
}
1406
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1411
if(ret_errno != 0){
1412
errno = old_errno;
1413
return ret_errno;
1414
}
1415
if(setuid(0) == -1){
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1418
}
1419
errno = old_errno;
1420
return ret_errno;
1421
}
1422
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1428
ret_errno = errno;
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1436
const float delay){
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1442
if(numhooks == -1){
1443
perror_plus("scandir");
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1451
perror_plus("asprintf");
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
free(delaystring);
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1522
} else {
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
1559
}
1560
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1563
int sd = -1;
1564
int old_errno = errno;
1565
int ret_errno = 0;
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
errno = old_errno;
1572
return ENXIO;
1573
}
1574
1575
if(quit_now){
1576
errno = old_errno;
1577
return EINTR;
1578
}
1579
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
ret_errno = errno;
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1645
errno = old_errno;
1646
return ret_errno;
1647
}
1648
}
1649
/* Sleep checking until interface is running.
1650
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1656
break;
1657
}
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1659
ret = nanosleep(&sleeptime, NULL);
1660
if(ret == -1 and errno != EINTR){
1661
perror_plus("nanosleep");
1662
}
1663
}
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
813
int main(int argc, char *argv[]){
1685
AvahiSServiceBrowser *sb = NULL;
1686
int error;
1687
int ret;
1688
intmax_t tmpmax;
1689
char *tmp;
1690
int exitcode = EXIT_SUCCESS;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1698
const char *seckey = PATHDIR "/" SECKEY;
1699
const char *pubkey = PATHDIR "/" PUBKEY;
1700
1701
bool gnutls_initialized = false;
1702
bool gpgme_initialized = false;
1703
float delay = 2.5f;
1704
double retry_interval = 10; /* 10s between trying a server and
1705
retrying the same server again */
1706
1707
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1708
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1709
1710
uid = getuid();
1711
gid = getgid();
1712
1713
/* Lower any group privileges we might have, just to be safe */
1714
errno = 0;
1715
ret = setgid(gid);
1716
if(ret == -1){
1717
perror_plus("setgid");
1718
}
1719
1720
/* Lower user privileges (temporarily) */
1721
errno = 0;
1722
ret = seteuid(uid);
1723
if(ret == -1){
1724
perror_plus("seteuid");
1725
}
1726
1727
if(quit_now){
1728
goto end;
1729
}
1730
1731
{
1732
struct argp_option options[] = {
1733
{ .name = "debug", .key = 128,
1734
.doc = "Debug mode", .group = 3 },
1735
{ .name = "connect", .key = 'c',
1736
.arg = "ADDRESS:PORT",
1737
.doc = "Connect directly to a specific Mandos server",
1738
.group = 1 },
1739
{ .name = "interface", .key = 'i',
1740
.arg = "NAME",
1741
.doc = "Network interface that will be used to search for"
1742
" Mandos servers",
1743
.group = 1 },
1744
{ .name = "seckey", .key = 's',
1745
.arg = "FILE",
1746
.doc = "OpenPGP secret key file base name",
1747
.group = 1 },
1748
{ .name = "pubkey", .key = 'p',
1749
.arg = "FILE",
1750
.doc = "OpenPGP public key file base name",
1751
.group = 2 },
1752
{ .name = "dh-bits", .key = 129,
1753
.arg = "BITS",
1754
.doc = "Bit length of the prime number used in the"
1755
" Diffie-Hellman key exchange",
1756
.group = 2 },
1757
{ .name = "priority", .key = 130,
1758
.arg = "STRING",
1759
.doc = "GnuTLS priority string for the TLS handshake",
1760
.group = 1 },
1761
{ .name = "delay", .key = 131,
1762
.arg = "SECONDS",
1763
.doc = "Maximum delay to wait for interface startup",
1764
.group = 2 },
1765
{ .name = "retry", .key = 132,
1766
.arg = "SECONDS",
1767
.doc = "Retry interval used when denied by the Mandos server",
1768
.group = 2 },
1769
{ .name = "network-hook-dir", .key = 133,
1770
.arg = "DIR",
1771
.doc = "Directory where network hooks are located",
1772
.group = 2 },
1773
/*
1774
* These reproduce what we would get without ARGP_NO_HELP
1775
*/
1776
{ .name = "help", .key = '?',
1777
.doc = "Give this help list", .group = -1 },
1778
{ .name = "usage", .key = -3,
1779
.doc = "Give a short usage message", .group = -1 },
1780
{ .name = "version", .key = 'V',
1781
.doc = "Print program version", .group = -1 },
1782
{ .name = NULL }
1783
};
1784
1785
error_t parse_opt(int key, char *arg,
1786
struct argp_state *state){
1787
errno = 0;
1788
switch(key){
1789
case 128: /* --debug */
1790
debug = true;
1791
break;
1792
case 'c': /* --connect */
1793
connect_to = arg;
1794
break;
1795
case 'i': /* --interface */
1796
interface = arg;
1797
break;
1798
case 's': /* --seckey */
1799
seckey = arg;
1800
break;
1801
case 'p': /* --pubkey */
1802
pubkey = arg;
1803
break;
1804
case 129: /* --dh-bits */
1805
errno = 0;
1806
tmpmax = strtoimax(arg, &tmp, 10);
1807
if(errno != 0 or tmp == arg or *tmp != '\0'
1808
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1809
argp_error(state, "Bad number of DH bits");
1810
}
1811
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1812
break;
1813
case 130: /* --priority */
1814
mc.priority = arg;
1815
break;
1816
case 131: /* --delay */
1817
errno = 0;
1818
delay = strtof(arg, &tmp);
1819
if(errno != 0 or tmp == arg or *tmp != '\0'){
1820
argp_error(state, "Bad delay");
1821
}
1822
case 132: /* --retry */
1823
errno = 0;
1824
retry_interval = strtod(arg, &tmp);
1825
if(errno != 0 or tmp == arg or *tmp != '\0'
1826
or (retry_interval * 1000) > INT_MAX
1827
or retry_interval < 0){
1828
argp_error(state, "Bad retry interval");
1829
}
1830
break;
1831
case 133: /* --network-hook-dir */
1832
hookdir = arg;
1833
break;
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
case '?': /* --help */
1838
argp_state_help(state, state->out_stream,
1839
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1840
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1841
case -3: /* --usage */
1842
argp_state_help(state, state->out_stream,
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1844
case 'V': /* --version */
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1846
exit(argp_err_exit_status);
1847
break;
1848
default:
1849
return ARGP_ERR_UNKNOWN;
1850
}
1851
return errno;
1852
}
1853
1854
struct argp argp = { .options = options, .parser = parse_opt,
1855
.args_doc = "",
1856
.doc = "Mandos client -- Get and decrypt"
1857
" passwords from a Mandos server" };
1858
ret = argp_parse(&argp, argc, argv,
1859
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1860
switch(ret){
1861
case 0:
1862
break;
1863
case ENOMEM:
1864
default:
1865
errno = ret;
1866
perror_plus("argp_parse");
1867
exitcode = EX_OSERR;
1868
goto end;
1869
case EINVAL:
1870
exitcode = EX_USAGE;
1871
goto end;
1872
}
1873
}
1874
1875
{
1876
/* Work around Debian bug #633582:
1877
<http://bugs.debian.org/633582> */
1878
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
1881
struct stat st;
1882
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1884
int seckey_fd = open(seckey, O_RDONLY);
1885
if(seckey_fd == -1){
1886
perror_plus("open");
1887
} else {
1888
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1889
if(ret == -1){
1890
perror_plus("fstat");
1891
} else {
1892
if(S_ISREG(st.st_mode)
1893
and st.st_uid == 0 and st.st_gid == 0){
1894
ret = fchown(seckey_fd, uid, gid);
1895
if(ret == -1){
1896
perror_plus("fchown");
1897
}
1898
}
1899
}
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
1901
}
1902
}
1903
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
int pubkey_fd = open(pubkey, O_RDONLY);
1906
if(pubkey_fd == -1){
1907
perror_plus("open");
1908
} else {
1909
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1910
if(ret == -1){
1911
perror_plus("fstat");
1912
} else {
1913
if(S_ISREG(st.st_mode)
1914
and st.st_uid == 0 and st.st_gid == 0){
1915
ret = fchown(pubkey_fd, uid, gid);
1916
if(ret == -1){
1917
perror_plus("fchown");
1918
}
1919
}
1920
}
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1922
}
1923
}
1924
1925
/* Lower privileges */
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
1930
}
1931
}
1932
}
1933
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1937
}
1938
1939
if(not debug){
1940
avahi_set_log_function(empty_log);
1941
}
1942
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
1964
goto end;
1965
}
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
1972
}
1973
}
1974
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1976
from the signal handler */
1977
/* Initialize the pseudo-RNG for Avahi */
1978
srand((unsigned int) time(NULL));
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1983
exitcode = EX_UNAVAILABLE;
1984
goto end;
1985
}
1986
1987
sigemptyset(&sigterm_action.sa_mask);
1988
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1989
if(ret == -1){
1990
perror_plus("sigaddset");
1991
exitcode = EX_OSERR;
1992
goto end;
1993
}
1994
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1995
if(ret == -1){
1996
perror_plus("sigaddset");
1997
exitcode = EX_OSERR;
1998
goto end;
1999
}
2000
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2001
if(ret == -1){
2002
perror_plus("sigaddset");
2003
exitcode = EX_OSERR;
2004
goto end;
2005
}
2006
/* Need to check if the handler is SIG_IGN before handling:
2007
| [[info:libc:Initial Signal Actions]] |
2008
| [[info:libc:Basic Signal Handling]] |
2009
*/
2010
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2011
if(ret == -1){
2012
perror_plus("sigaction");
2013
return EX_OSERR;
2014
}
2015
if(old_sigterm_action.sa_handler != SIG_IGN){
2016
ret = sigaction(SIGINT, &sigterm_action, NULL);
2017
if(ret == -1){
2018
perror_plus("sigaction");
2019
exitcode = EX_OSERR;
2020
goto end;
2021
}
2022
}
2023
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2024
if(ret == -1){
2025
perror_plus("sigaction");
2026
return EX_OSERR;
2027
}
2028
if(old_sigterm_action.sa_handler != SIG_IGN){
2029
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2030
if(ret == -1){
2031
perror_plus("sigaction");
2032
exitcode = EX_OSERR;
2033
goto end;
2034
}
2035
}
2036
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2037
if(ret == -1){
2038
perror_plus("sigaction");
2039
return EX_OSERR;
2040
}
2041
if(old_sigterm_action.sa_handler != SIG_IGN){
2042
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2043
if(ret == -1){
2044
perror_plus("sigaction");
2045
exitcode = EX_OSERR;
2046
goto end;
2047
}
2048
}
2049
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2057
}
2058
2059
if(quit_now){
2060
goto end;
2061
}
2062
2063
ret = init_gnutls_global(pubkey, seckey);
2064
if(ret == -1){
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2066
exitcode = EX_UNAVAILABLE;
2067
goto end;
2068
} else {
2069
gnutls_initialized = true;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
2076
if(mkdtemp(tempdir) == NULL){
2077
perror_plus("mkdtemp");
2078
goto end;
2079
}
2080
tempdir_created = true;
2081
2082
if(quit_now){
2083
goto end;
2084
}
2085
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2088
exitcode = EX_UNAVAILABLE;
2089
goto end;
2090
} else {
2091
gpgme_initialized = true;
2092
}
2093
2094
if(quit_now){
2095
goto end;
2096
}
2097
2098
if(connect_to != NULL){
2099
/* Connect directly, do not use Zeroconf */
2100
/* (Mainly meant for debugging) */
2101
char *address = strrchr(connect_to, ':');
2102
2103
if(address == NULL){
2104
fprintf_plus(stderr, "No colon in address\n");
2105
exitcode = EX_USAGE;
2106
goto end;
2107
}
2108
2109
if(quit_now){
2110
goto end;
2111
}
2112
2113
uint16_t port;
2114
errno = 0;
2115
tmpmax = strtoimax(address+1, &tmp, 10);
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2117
or tmpmax != (uint16_t)tmpmax){
2118
fprintf_plus(stderr, "Bad port number\n");
2119
exitcode = EX_USAGE;
2120
goto end;
2121
}
2122
2123
if(quit_now){
2124
goto end;
2125
}
2126
2127
port = (uint16_t)tmpmax;
2128
*address = '\0';
2129
/* Colon in address indicates IPv6 */
2130
int af;
2131
if(strchr(connect_to, ':') != NULL){
2132
af = AF_INET6;
2133
/* Accept [] around IPv6 address - see RFC 5952 */
2134
if(connect_to[0] == '[' and address[-1] == ']')
2135
{
2136
connect_to++;
2137
address[-1] = '\0';
2138
}
2139
} else {
2140
af = AF_INET;
2141
}
2142
address = connect_to;
2143
2144
if(quit_now){
2145
goto end;
2146
}
2147
2148
while(not quit_now){
2149
ret = start_mandos_communication(address, port, if_index, af);
2150
if(quit_now or ret == 0){
2151
break;
2152
}
2153
if(debug){
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
(int)retry_interval);
2156
}
2157
sleep((int)retry_interval);
2158
}
2159
2160
if (not quit_now){
2161
exitcode = EXIT_SUCCESS;
2162
}
2163
2164
goto end;
2165
}
2166
2167
if(quit_now){
2168
goto end;
2169
}
2170
2171
{
2172
AvahiServerConfig config;
2173
/* Do not publish any local Zeroconf records */
2174
avahi_server_config_init(&config);
2175
config.publish_hinfo = 0;
2176
config.publish_addresses = 0;
2177
config.publish_workstation = 0;
2178
config.publish_domain = 0;
2179
2180
/* Allocate a new server */
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
2184
2185
/* Free the Avahi configuration data */
2186
avahi_server_config_free(&config);
2187
}
2188
2189
/* Check if creating the Avahi server object succeeded */
2190
if(mc.server == NULL){
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
2193
exitcode = EX_UNAVAILABLE;
2194
goto end;
2195
}
2196
2197
if(quit_now){
2198
goto end;
2199
}
2200
2201
/* Create the Avahi service browser */
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2204
NULL, 0, browse_callback, NULL);
2205
if(sb == NULL){
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
avahi_strerror(avahi_server_errno(mc.server)));
2208
exitcode = EX_UNAVAILABLE;
2209
goto end;
2210
}
2211
2212
if(quit_now){
2213
goto end;
2214
}
2215
2216
/* Run the main loop */
2217
2218
if(debug){
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2220
}
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2224
if(debug){
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
(ret == 0) ? "successfully" : "with error");
2227
}
2228
2229
end:
2230
2231
if(debug){
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2233
}
2234
2235
/* Cleanup things */
2236
if(sb != NULL)
2237
avahi_s_service_browser_free(sb);
2238
2239
if(mc.server != NULL)
2240
avahi_server_free(mc.server);
2241
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
2244
2245
if(gnutls_initialized){
2246
gnutls_certificate_free_credentials(mc.cred);
2247
gnutls_global_deinit();
2248
gnutls_dh_params_deinit(mc.dh_params);
2249
}
2250
2251
if(gpgme_initialized){
2252
gpgme_release(mc.ctx);
2253
}
2254
2255
/* Cleans up the circular linked list of Mandos servers the client
2256
has seen */
2257
if(mc.current_server != NULL){
2258
mc.current_server->prev->next = NULL;
2259
while(mc.current_server != NULL){
2260
server *next = mc.current_server->next;
2261
free(mc.current_server);
2262
mc.current_server = next;
2263
}
2264
}
2265
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
2270
{
2271
raise_privileges();
2272
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
2275
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
931
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
2280
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
939
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
}
2284
}
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2288
}
2289
}
2290
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2297
2298
/* Removes the GPGME temp directory and all files inside */
2299
if(tempdir_created){
2300
struct dirent **direntries = NULL;
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
direntry->d_name);
2310
if(ret < 0){
2311
perror_plus("asprintf");
2312
continue;
2313
}
2314
ret = remove(fullname);
2315
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2318
}
2319
free(fullname);
2320
}
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
2327
}
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2331
}
2332
}
2333
2334
if(quit_now){
2335
sigemptyset(&old_sigterm_action.sa_mask);
2336
old_sigterm_action.sa_handler = SIG_DFL;
2337
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2338
&old_sigterm_action,
2339
NULL));
2340
if(ret == -1){
2341
perror_plus("sigaction");
2342
}
2343
do {
2344
ret = raise(signal_received);
2345
} while(ret != 0 and errno == EINTR);
2346
if(ret != 0){
2347
perror_plus("raise");
2348
abort();
2349
}
2350
TEMP_FAILURE_RETRY(pause());
2351
}
2352
2353
return exitcode;
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
987
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
if(if_index == 0){
989
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
1082
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2354
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0