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- Committer: Teddy Hogeborn
- Date: 2012-01-01 05:42:51 UTC
- mfrom: (291 release)
- mto: (237.7.109 trunk) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 292.
- Revision ID: teddy@recompile.se-20120101054251-26jflhej4znq2mzq
Merge from release branch.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- 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
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
SIOCSIFFLAGS, if_indextoname(),
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
#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 */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
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__ */
95
96
/* Avahi */
97
/* All Avahi types, constants and functions
98
Avahi*, avahi_*,
99
AVAHI_* */
41
100
#include <avahi-core/core.h>
42
101
#include <avahi-core/lookup.h>
43
102
#include <avahi-core/log.h>
45
104
#include <avahi-common/malloc.h>
46
105
#include <avahi-common/error.h>
47
106
48
//mandos client part
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
54
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
66
// getopt long
67
#include <getopt.h>
107
/* GnuTLS */
108
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
109
functions:
110
gnutls_*
111
init_gnutls_session(),
112
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
116
117
/* GPGME */
118
#include <gpgme.h> /* All GPGME types, constants and
119
functions:
120
gpgme_*
121
GPGME_PROTOCOL_OpenPGP,
122
GPG_ERR_NO_* */
68
123
69
124
#define BUFFER_SIZE 256
70
#define DH_BITS 1024
71
125
72
const char *certdir = "/conf/conf.d/cryptkeyreq/";
73
const char *certfile = "openpgp-client.txt";
74
const char *certkey = "openpgp-client-key.txt";
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"
75
130
76
131
bool debug = false;
77
132
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
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
149
150
/* Used for passing in values through the Avahi callback functions */
78
151
typedef struct {
79
gnutls_session_t session;
152
AvahiSimplePoll *simple_poll;
153
AvahiServer *server;
80
154
gnutls_certificate_credentials_t cred;
155
unsigned int dh_bits;
81
156
gnutls_dh_params_t dh_params;
82
} encrypted_session;
83
84
85
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet, const char *homedir){
87
gpgme_data_t dh_crypto, dh_plain;
157
const char *priority;
88
158
gpgme_ctx_t ctx;
159
server *current_server;
160
} mandos_context;
161
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
/*
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
* bytes. "buffer_capacity" is how much is currently allocated,
193
* "buffer_length" is how much is already used.
194
*/
195
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
200
return 0;
201
}
202
buffer_capacity += BUFFER_SIZE;
203
}
204
return buffer_capacity;
205
}
206
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
/*
245
* Initialize GPGME.
246
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
89
249
gpgme_error_t rc;
90
ssize_t ret;
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
93
250
gpgme_engine_info_t engine_info;
94
95
if (debug){
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
251
252
253
/*
254
* Helper function to insert pub and seckey to the engine keyring.
255
*/
256
bool import_key(const char *filename){
257
int ret;
258
int fd;
259
gpgme_data_t pgp_data;
260
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
if(fd == -1){
263
perror_plus("open");
264
return false;
265
}
266
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
271
return false;
272
}
273
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
278
return false;
279
}
280
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
if(ret == -1){
283
perror_plus("close");
284
}
285
gpgme_data_release(pgp_data);
286
return true;
287
}
288
289
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
97
291
}
98
292
99
293
/* Init GPGME */
100
294
gpgme_check_version(NULL);
101
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
102
if (rc != GPG_ERR_NO_ERROR){
103
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
104
gpgme_strsource(rc), gpgme_strerror(rc));
105
return -1;
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
299
return false;
106
300
}
107
301
108
/* Set GPGME home directory */
109
rc = gpgme_get_engine_info (&engine_info);
110
if (rc != GPG_ERR_NO_ERROR){
111
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
112
gpgme_strsource(rc), gpgme_strerror(rc));
113
return -1;
302
/* Set GPGME home directory for the OpenPGP engine only */
303
rc = gpgme_get_engine_info(&engine_info);
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
307
return false;
114
308
}
115
309
while(engine_info != NULL){
116
310
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
117
311
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
118
engine_info->file_name, homedir);
312
engine_info->file_name, tempdir);
119
313
break;
120
314
}
121
315
engine_info = engine_info->next;
122
316
}
123
317
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
125
return -1;
126
}
127
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
130
if (rc != GPG_ERR_NO_ERROR){
131
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
320
return false;
321
}
322
323
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
329
return false;
330
}
331
332
if(not import_key(pubkey) or not import_key(seckey)){
333
return false;
334
}
335
336
return true;
337
}
338
339
/*
340
* Decrypt OpenPGP data.
341
* Returns -1 on error
342
*/
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
size_t crypto_size,
345
char **plaintext){
346
gpgme_data_t dh_crypto, dh_plain;
347
gpgme_error_t rc;
348
ssize_t ret;
349
size_t plaintext_capacity = 0;
350
ssize_t plaintext_length = 0;
351
352
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
354
}
355
356
/* Create new GPGME data buffer from memory cryptotext */
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
0);
359
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
133
362
return -1;
134
363
}
135
364
136
365
/* Create new empty GPGME data buffer for the plaintext */
137
366
rc = gpgme_data_new(&dh_plain);
138
if (rc != GPG_ERR_NO_ERROR){
139
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
gpgme_strsource(rc), gpgme_strerror(rc));
141
return -1;
142
}
143
144
/* Create new GPGME "context" */
145
rc = gpgme_new(&ctx);
146
if (rc != GPG_ERR_NO_ERROR){
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
gpgme_strsource(rc), gpgme_strerror(rc));
149
return -1;
150
}
151
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
if (rc != GPG_ERR_NO_ERROR){
156
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
159
}
160
161
if(debug){
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
163
}
164
165
if (debug){
166
gpgme_decrypt_result_t result;
167
result = gpgme_op_decrypt_result(ctx);
168
if (result == NULL){
169
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
170
} else {
171
fprintf(stderr, "Unsupported algorithm: %s\n",
172
result->unsupported_algorithm);
173
fprintf(stderr, "Wrong key usage: %d\n",
174
result->wrong_key_usage);
175
if(result->file_name != NULL){
176
fprintf(stderr, "File name: %s\n", result->file_name);
177
}
178
gpgme_recipient_t recipient;
179
recipient = result->recipients;
180
if(recipient){
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
371
gpgme_data_release(dh_crypto);
372
return -1;
373
}
374
375
/* Decrypt data from the cryptotext data buffer to the plaintext
376
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
381
plaintext_length = -1;
382
if(debug){
383
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
385
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
392
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
}
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
181
397
while(recipient != NULL){
182
fprintf(stderr, "Public key algorithm: %s\n",
183
gpgme_pubkey_algo_name(recipient->pubkey_algo));
184
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
185
fprintf(stderr, "Secret key available: %s\n",
186
recipient->status == GPG_ERR_NO_SECKEY
187
? "No" : "Yes");
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
188
405
recipient = recipient->next;
189
406
}
190
407
}
191
408
}
409
goto decrypt_end;
192
410
}
193
411
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
412
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
}
196
415
197
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
199
perror("pgpme_data_seek");
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
419
plaintext_length = -1;
420
goto decrypt_end;
200
421
}
201
422
202
*new_packet = 0;
423
*plaintext = NULL;
203
424
while(true){
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
207
+ BUFFER_SIZE);
208
if (*new_packet == NULL){
209
perror("realloc");
210
return -1;
211
}
212
new_packet_capacity += BUFFER_SIZE;
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
428
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
213
432
}
214
433
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
435
BUFFER_SIZE);
217
436
/* Print the data, if any */
218
if (ret == 0){
437
if(ret == 0){
438
/* EOF */
219
439
break;
220
440
}
221
441
if(ret < 0){
222
perror("gpgme_data_read");
223
return -1;
224
}
225
new_packet_length += ret;
226
}
227
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
230
/* if(debug){ */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
234
/* } */
442
perror_plus("gpgme_data_read");
443
plaintext_length = -1;
444
goto decrypt_end;
445
}
446
plaintext_length += ret;
447
}
448
449
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
451
for(ssize_t i = 0; i < plaintext_length; i++){
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
}
454
fprintf(stderr, "\n");
455
}
456
457
decrypt_end:
458
459
/* Delete the GPGME cryptotext data buffer */
460
gpgme_data_release(dh_crypto);
235
461
236
462
/* Delete the GPGME plaintext data buffer */
237
463
gpgme_data_release(dh_plain);
238
return new_packet_length;
464
return plaintext_length;
239
465
}
240
466
241
static const char * safer_gnutls_strerror (int value) {
242
const char *ret = gnutls_strerror (value);
243
if (ret == NULL)
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
244
471
ret = "(unknown)";
245
472
return ret;
246
473
}
247
474
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
475
/* GnuTLS log function callback */
476
static void debuggnutls(__attribute__((unused)) int level,
477
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
251
479
}
252
480
253
int initgnutls(encrypted_session *es){
254
const char *err;
481
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
255
483
int ret;
256
484
257
485
if(debug){
258
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
259
487
}
260
261
if ((ret = gnutls_global_init ())
262
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
488
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
264
493
return -1;
265
494
}
266
267
if (debug){
495
496
if(debug){
497
/* "Use a log level over 10 to enable all debugging options."
498
* - GnuTLS manual
499
*/
268
500
gnutls_global_set_log_level(11);
269
501
gnutls_global_set_log_function(debuggnutls);
270
502
}
271
503
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
274
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
276
safer_gnutls_strerror(ret));
504
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
277
510
return -1;
278
511
}
279
512
280
513
if(debug){
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
284
518
}
285
519
286
520
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
288
if (ret != GNUTLS_E_SUCCESS) {
289
fprintf
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
291
" '%s')\n",
292
ret, certfile, certkey);
293
fprintf(stdout, "The Error is: %s\n",
294
safer_gnutls_strerror(ret));
295
return -1;
296
}
297
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
303
return -1;
304
}
305
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
310
return -1;
311
}
312
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
314
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= GNUTLS_E_SUCCESS){
318
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
safer_gnutls_strerror(ret));
320
}
321
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
327
return -1;
328
}
329
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
fprintf(stderr, "Error setting a credentials set: %s\n",
334
safer_gnutls_strerror(ret));
521
(mc.cred, pubkeyfilename, seckeyfilename,
522
GNUTLS_OPENPGP_FMT_BASE64);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
529
goto globalfail;
530
}
531
532
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
538
goto globalfail;
539
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
549
return 0;
550
551
globalfail:
552
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
556
return -1;
557
}
558
559
static int init_gnutls_session(gnutls_session_t *session){
560
int ret;
561
/* GnuTLS session creation */
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
572
}
573
574
{
575
const char *err;
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
587
gnutls_deinit(*session);
588
return -1;
589
}
590
}
591
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
603
gnutls_deinit(*session);
335
604
return -1;
336
605
}
337
606
338
607
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
340
GNUTLS_CERT_IGNORE);
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
341
609
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
343
611
344
612
return 0;
345
613
}
346
614
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
615
/* Avahi log function callback */
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
__attribute__((unused)) const char *txt){}
349
618
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
352
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
619
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
621
AvahiIfIndex if_index,
622
int af){
623
int ret, tcp_sd = -1;
624
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
355
629
char *buffer = NULL;
356
char *decrypted_buffer;
630
char *decrypted_buffer = NULL;
357
631
size_t buffer_length = 0;
358
632
size_t buffer_capacity = 0;
359
ssize_t decrypted_buffer_size;
360
size_t written = 0;
361
int retval = 0;
362
char interface[IF_NAMESIZE];
363
364
if(debug){
365
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
366
ip, port);
367
}
368
369
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
370
if(tcp_sd < 0) {
371
perror("socket");
372
return -1;
373
}
374
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(debug){
377
perror("if_indextoname");
378
}
379
return -1;
380
}
381
382
if(debug){
383
fprintf(stderr, "Binding to interface %s\n", interface);
384
}
385
386
memset(&to,0,sizeof(to)); /* Spurious warning */
387
to.sin6_family = AF_INET6;
388
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
389
if (ret < 0 ){
390
perror("inet_pton");
391
return -1;
392
}
633
size_t written;
634
int retval = -1;
635
gnutls_session_t session;
636
int pf; /* Protocol family */
637
638
errno = 0;
639
640
if(quit_now){
641
errno = EINTR;
642
return -1;
643
}
644
645
switch(af){
646
case AF_INET6:
647
pf = PF_INET6;
648
break;
649
case AF_INET:
650
pf = PF_INET;
651
break;
652
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
655
return -1;
656
}
657
658
ret = init_gnutls_session(&session);
659
if(ret != 0){
660
return -1;
661
}
662
663
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
666
}
667
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
673
goto mandos_end;
674
}
675
676
if(quit_now){
677
errno = EINTR;
678
goto mandos_end;
679
}
680
681
memset(&to, 0, sizeof(to));
682
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
685
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
688
}
689
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
693
goto mandos_end;
694
}
393
695
if(ret == 0){
394
fprintf(stderr, "Bad address: %s\n", ip);
395
return -1;
396
}
397
to.sin6_port = htons(port); /* Spurious warning */
398
399
to.sin6_scope_id = (uint32_t)if_index;
400
401
if(debug){
402
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
403
/* char addrstr[INET6_ADDRSTRLEN]; */
404
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
405
/* sizeof(addrstr)) == NULL){ */
406
/* perror("inet_ntop"); */
407
/* } else { */
408
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
409
/* addrstr, ntohs(to.sin6_port)); */
410
/* } */
411
}
412
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
414
if (ret < 0){
415
perror("connect");
416
return -1;
417
}
418
419
ret = initgnutls (&es);
420
if (ret != 0){
421
retval = -1;
422
return -1;
423
}
424
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
427
428
if(debug){
429
fprintf(stderr, "Establishing TLS session with %s\n", ip);
430
}
431
432
ret = gnutls_handshake (es.session);
433
434
if (ret != GNUTLS_E_SUCCESS){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
699
goto mandos_end;
700
}
701
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
709
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
713
goto mandos_end;
714
}
715
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
717
}
718
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
722
}
723
724
if(quit_now){
725
errno = EINTR;
726
goto mandos_end;
727
}
728
729
if(debug){
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
char interface[IF_NAMESIZE];
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
734
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
737
}
738
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
741
}
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
783
}
784
785
const char *out = mandos_protocol_version;
786
written = 0;
787
while(true){
788
size_t out_size = strlen(out);
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
791
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
795
goto mandos_end;
796
}
797
written += (size_t)ret;
798
if(written < out_size){
799
continue;
800
} else {
801
if(out == mandos_protocol_version){
802
written = 0;
803
out = "\r\n";
804
} else {
805
break;
806
}
807
}
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
}
814
815
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
817
}
818
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
827
if(quit_now){
828
errno = EINTR;
829
goto mandos_end;
830
}
831
832
do {
833
ret = gnutls_handshake(session);
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
839
840
if(ret != GNUTLS_E_SUCCESS){
435
841
if(debug){
436
fprintf(stderr, "\n*** Handshake failed ***\n");
437
gnutls_perror (ret);
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
843
gnutls_perror(ret);
438
844
}
439
retval = -1;
440
goto exit;
845
errno = EPROTO;
846
goto mandos_end;
441
847
}
442
848
443
//Retrieve OpenPGP packet that contains the wanted password
849
/* Read OpenPGP packet that contains the wanted password */
444
850
445
851
if(debug){
446
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
447
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
448
854
}
449
855
450
856
while(true){
451
if (buffer_length + BUFFER_SIZE > buffer_capacity){
452
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
453
if (buffer == NULL){
454
perror("realloc");
455
goto exit;
456
}
457
buffer_capacity += BUFFER_SIZE;
458
}
459
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
462
if (ret == 0){
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
865
if(buffer_capacity == 0){
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
869
goto mandos_end;
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
sret = gnutls_record_recv(session, buffer+buffer_length,
878
BUFFER_SIZE);
879
if(sret == 0){
463
880
break;
464
881
}
465
if (ret < 0){
466
switch(ret){
882
if(sret < 0){
883
switch(sret){
467
884
case GNUTLS_E_INTERRUPTED:
468
885
case GNUTLS_E_AGAIN:
469
886
break;
470
887
case GNUTLS_E_REHANDSHAKE:
471
ret = gnutls_handshake (es.session);
472
if (ret < 0){
473
fprintf(stderr, "\n*** Handshake failed ***\n");
474
gnutls_perror (ret);
475
retval = -1;
476
goto exit;
888
do {
889
ret = gnutls_handshake(session);
890
891
if(quit_now){
892
errno = EINTR;
893
goto mandos_end;
894
}
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
899
gnutls_perror(ret);
900
errno = EPROTO;
901
goto mandos_end;
477
902
}
478
903
break;
479
904
default:
480
fprintf(stderr, "Unknown error while reading data from"
481
" encrypted session with mandos server\n");
482
retval = -1;
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
484
goto exit;
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
909
goto mandos_end;
485
910
}
486
911
} else {
487
buffer_length += (size_t) ret;
488
}
489
}
490
491
if (buffer_length > 0){
492
decrypted_buffer_size = pgp_packet_decrypt(buffer,
493
buffer_length,
494
&decrypted_buffer,
495
certdir);
496
if (decrypted_buffer_size >= 0){
912
buffer_length += (size_t) sret;
913
}
914
}
915
916
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
918
}
919
920
if(quit_now){
921
errno = EINTR;
922
goto mandos_end;
923
}
924
925
do {
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
933
if(buffer_length > 0){
934
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
937
if(decrypted_buffer_size >= 0){
938
939
written = 0;
497
940
while(written < (size_t) decrypted_buffer_size){
498
ret = (int)fwrite (decrypted_buffer + written, 1,
499
(size_t)decrypted_buffer_size - written,
500
stdout);
941
if(quit_now){
942
errno = EINTR;
943
goto mandos_end;
944
}
945
946
ret = (int)fwrite(decrypted_buffer + written, 1,
947
(size_t)decrypted_buffer_size - written,
948
stdout);
501
949
if(ret == 0 and ferror(stdout)){
950
int e = errno;
502
951
if(debug){
503
fprintf(stderr, "Error writing encrypted data: %s\n",
504
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
505
954
}
506
retval = -1;
507
break;
955
errno = e;
956
goto mandos_end;
508
957
}
509
958
written += (size_t)ret;
510
959
}
511
free(decrypted_buffer);
512
} else {
960
retval = 0;
961
}
962
}
963
964
/* Shutdown procedure */
965
966
mandos_end:
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
513
984
retval = -1;
514
985
}
515
986
}
516
517
//shutdown procedure
518
519
if(debug){
520
fprintf(stderr, "Closing TLS session\n");
521
}
522
523
free(buffer);
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
exit:
526
close(tcp_sd);
527
gnutls_deinit (es.session);
528
gnutls_certificate_free_credentials (es.cred);
529
gnutls_global_deinit ();
530
987
return retval;
531
988
}
532
989
533
static AvahiSimplePoll *simple_poll = NULL;
534
static AvahiServer *server = NULL;
535
536
static void resolve_callback(
537
AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
AVAHI_GCC_UNUSED void* userdata) {
550
551
assert(r); /* Spurious warning */
990
static void resolve_callback(AvahiSServiceResolver *r,
991
AvahiIfIndex interface,
992
AvahiProtocol proto,
993
AvahiResolverEvent event,
994
const char *name,
995
const char *type,
996
const char *domain,
997
const char *host_name,
998
const AvahiAddress *address,
999
uint16_t port,
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
552
1005
553
1006
/* Called whenever a service has been resolved successfully or
554
1007
timed out */
555
1008
556
switch (event) {
1009
if(quit_now){
1010
return;
1011
}
1012
1013
switch(event){
557
1014
default:
558
1015
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
avahi_strerror(avahi_server_errno(server)));
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
562
1020
break;
563
1021
564
1022
case AVAHI_RESOLVER_FOUND:
566
1024
char ip[AVAHI_ADDRESS_STR_MAX];
567
1025
avahi_address_snprint(ip, sizeof(ip), address);
568
1026
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
571
1030
}
572
int ret = start_mandos_communication(ip, port, interface);
573
if (ret == 0){
574
exit(EXIT_SUCCESS);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1033
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
575
1041
}
576
1042
}
577
1043
}
578
1044
avahi_s_service_resolver_free(r);
579
1045
}
580
1046
581
static void browse_callback(
582
AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
586
const char *name,
587
const char *type,
588
const char *domain,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
void* userdata) {
591
592
AvahiServer *s = userdata;
593
assert(b); /* Spurious warning */
594
595
/* Called whenever a new services becomes available on the LAN or
596
is removed from the LAN */
597
598
switch (event) {
1047
static void browse_callback(AvahiSServiceBrowser *b,
1048
AvahiIfIndex interface,
1049
AvahiProtocol protocol,
1050
AvahiBrowserEvent event,
1051
const char *name,
1052
const char *type,
1053
const char *domain,
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1058
1059
/* Called whenever a new services becomes available on the LAN or
1060
is removed from the LAN */
1061
1062
if(quit_now){
1063
return;
1064
}
1065
1066
switch(event){
1067
default:
1068
case AVAHI_BROWSER_FAILURE:
1069
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1073
return;
1074
1075
case AVAHI_BROWSER_NEW:
1076
/* We ignore the returned Avahi resolver object. In the callback
1077
function we free it. If the Avahi server is terminated before
1078
the callback function is called the Avahi server will free the
1079
resolver for us. */
1080
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1087
break;
1088
1089
case AVAHI_BROWSER_REMOVE:
1090
break;
1091
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1097
}
1098
break;
1099
}
1100
}
1101
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1104
if(quit_now){
1105
return;
1106
}
1107
quit_now = 1;
1108
signal_received = sig;
1109
int old_errno = errno;
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1113
}
1114
errno = old_errno;
1115
}
1116
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1526
int main(int argc, char *argv[]){
1527
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1529
int ret;
1530
intmax_t tmpmax;
1531
char *tmp;
1532
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
const char *seckey = PATHDIR "/" SECKEY;
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1544
1545
bool gnutls_initialized = false;
1546
bool gpgme_initialized = false;
1547
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1550
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1552
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1553
1554
uid = getuid();
1555
gid = getgid();
1556
1557
/* Lower any group privileges we might have, just to be safe */
1558
errno = 0;
1559
ret = setgid(gid);
1560
if(ret == -1){
1561
perror_plus("setgid");
1562
}
1563
1564
/* Lower user privileges (temporarily) */
1565
errno = 0;
1566
ret = seteuid(uid);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
{
1576
struct argp_option options[] = {
1577
{ .name = "debug", .key = 128,
1578
.doc = "Debug mode", .group = 3 },
1579
{ .name = "connect", .key = 'c',
1580
.arg = "ADDRESS:PORT",
1581
.doc = "Connect directly to a specific Mandos server",
1582
.group = 1 },
1583
{ .name = "interface", .key = 'i',
1584
.arg = "NAME",
1585
.doc = "Network interface that will be used to search for"
1586
" Mandos servers",
1587
.group = 1 },
1588
{ .name = "seckey", .key = 's',
1589
.arg = "FILE",
1590
.doc = "OpenPGP secret key file base name",
1591
.group = 1 },
1592
{ .name = "pubkey", .key = 'p',
1593
.arg = "FILE",
1594
.doc = "OpenPGP public key file base name",
1595
.group = 2 },
1596
{ .name = "dh-bits", .key = 129,
1597
.arg = "BITS",
1598
.doc = "Bit length of the prime number used in the"
1599
" Diffie-Hellman key exchange",
1600
.group = 2 },
1601
{ .name = "priority", .key = 130,
1602
.arg = "STRING",
1603
.doc = "GnuTLS priority string for the TLS handshake",
1604
.group = 1 },
1605
{ .name = "delay", .key = 131,
1606
.arg = "SECONDS",
1607
.doc = "Maximum delay to wait for interface startup",
1608
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1617
/*
1618
* These reproduce what we would get without ARGP_NO_HELP
1619
*/
1620
{ .name = "help", .key = '?',
1621
.doc = "Give this help list", .group = -1 },
1622
{ .name = "usage", .key = -3,
1623
.doc = "Give a short usage message", .group = -1 },
1624
{ .name = "version", .key = 'V',
1625
.doc = "Print program version", .group = -1 },
1626
{ .name = NULL }
1627
};
1628
1629
error_t parse_opt(int key, char *arg,
1630
struct argp_state *state){
1631
errno = 0;
1632
switch(key){
1633
case 128: /* --debug */
1634
debug = true;
1635
break;
1636
case 'c': /* --connect */
1637
connect_to = arg;
1638
break;
1639
case 'i': /* --interface */
1640
interface = arg;
1641
break;
1642
case 's': /* --seckey */
1643
seckey = arg;
1644
break;
1645
case 'p': /* --pubkey */
1646
pubkey = arg;
1647
break;
1648
case 129: /* --dh-bits */
1649
errno = 0;
1650
tmpmax = strtoimax(arg, &tmp, 10);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'
1652
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1653
argp_error(state, "Bad number of DH bits");
1654
}
1655
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
break;
1657
case 130: /* --priority */
1658
mc.priority = arg;
1659
break;
1660
case 131: /* --delay */
1661
errno = 0;
1662
delay = strtof(arg, &tmp);
1663
if(errno != 0 or tmp == arg or *tmp != '\0'){
1664
argp_error(state, "Bad delay");
1665
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1678
/*
1679
* These reproduce what we would get without ARGP_NO_HELP
1680
*/
1681
case '?': /* --help */
1682
argp_state_help(state, state->out_stream,
1683
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1684
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1685
case -3: /* --usage */
1686
argp_state_help(state, state->out_stream,
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1690
exit(argp_err_exit_status);
1691
break;
1692
default:
1693
return ARGP_ERR_UNKNOWN;
1694
}
1695
return errno;
1696
}
1697
1698
struct argp argp = { .options = options, .parser = parse_opt,
1699
.args_doc = "",
1700
.doc = "Mandos client -- Get and decrypt"
1701
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
1705
case 0:
1706
break;
1707
case ENOMEM:
599
1708
default:
600
case AVAHI_BROWSER_FAILURE:
601
602
fprintf(stderr, "(Browser) %s\n",
603
avahi_strerror(avahi_server_errno(server)));
604
avahi_simple_poll_quit(simple_poll);
605
return;
606
607
case AVAHI_BROWSER_NEW:
608
/* We ignore the returned resolver object. In the callback
609
function we free it. If the server is terminated before
610
the callback function is called the server will free
611
the resolver for us. */
612
613
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
614
type, domain,
615
AVAHI_PROTO_INET6, 0,
616
resolve_callback, s)))
617
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
618
avahi_strerror(avahi_server_errno(s)));
619
break;
620
621
case AVAHI_BROWSER_REMOVE:
622
break;
623
624
case AVAHI_BROWSER_ALL_FOR_NOW:
625
case AVAHI_BROWSER_CACHE_EXHAUSTED:
626
break;
627
}
628
}
629
630
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
631
const char *combinepath(const char *first, const char *second){
632
char *tmp;
633
tmp = malloc(strlen(first) + strlen(second) + 2);
634
if (tmp == NULL){
635
perror("malloc");
636
return NULL;
637
}
638
strcpy(tmp, first);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
640
strcat(tmp, "/");
641
}
642
strcat(tmp, second);
643
return tmp;
644
}
645
646
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
1709
errno = ret;
1710
perror_plus("argp_parse");
1711
exitcode = EX_OSERR;
1712
goto end;
1713
case EINVAL:
1714
exitcode = EX_USAGE;
1715
goto end;
1716
}
1717
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1785
}
1786
1787
if(not debug){
1788
avahi_set_log_function(empty_log);
1789
}
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
from the signal handler */
1825
/* Initialize the pseudo-RNG for Avahi */
1826
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1831
exitcode = EX_UNAVAILABLE;
1832
goto end;
1833
}
1834
1835
sigemptyset(&sigterm_action.sa_mask);
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1837
if(ret == -1){
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1840
goto end;
1841
}
1842
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1843
if(ret == -1){
1844
perror_plus("sigaddset");
1845
exitcode = EX_OSERR;
1846
goto end;
1847
}
1848
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1849
if(ret == -1){
1850
perror_plus("sigaddset");
1851
exitcode = EX_OSERR;
1852
goto end;
1853
}
1854
/* Need to check if the handler is SIG_IGN before handling:
1855
| [[info:libc:Initial Signal Actions]] |
1856
| [[info:libc:Basic Signal Handling]] |
1857
*/
1858
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1859
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1862
}
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGINT, &sigterm_action, NULL);
1865
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1868
goto end;
1869
}
1870
}
1871
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1872
if(ret == -1){
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1875
}
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1878
if(ret == -1){
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1881
goto end;
1882
}
1883
}
1884
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1885
if(ret == -1){
1886
perror_plus("sigaction");
1887
return EX_OSERR;
1888
}
1889
if(old_sigterm_action.sa_handler != SIG_IGN){
1890
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1891
if(ret == -1){
1892
perror_plus("sigaction");
1893
exitcode = EX_OSERR;
1894
goto end;
1895
}
1896
}
1897
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
1983
}
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
break;
2003
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2033
}
2034
2035
if(quit_now){
2036
goto end;
2037
}
2038
2039
ret = init_gnutls_global(pubkey, seckey);
2040
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
exitcode = EX_UNAVAILABLE;
2043
goto end;
2044
} else {
2045
gnutls_initialized = true;
2046
}
2047
2048
if(quit_now){
2049
goto end;
2050
}
2051
2052
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
2054
goto end;
2055
}
2056
tempdir_created = true;
2057
2058
if(quit_now){
2059
goto end;
2060
}
2061
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
2065
goto end;
2066
} else {
2067
gpgme_initialized = true;
2068
}
2069
2070
if(quit_now){
2071
goto end;
2072
}
2073
2074
if(connect_to != NULL){
2075
/* Connect directly, do not use Zeroconf */
2076
/* (Mainly meant for debugging) */
2077
char *address = strrchr(connect_to, ':');
2078
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
2080
exitcode = EX_USAGE;
2081
goto end;
2082
}
2083
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
uint16_t port;
2089
errno = 0;
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
2094
exitcode = EX_USAGE;
2095
goto end;
2096
}
2097
2098
if(quit_now){
2099
goto end;
2100
}
2101
2102
port = (uint16_t)tmpmax;
2103
*address = '\0';
2104
/* Colon in address indicates IPv6 */
2105
int af;
2106
if(strchr(connect_to, ':') != NULL){
2107
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
2114
} else {
2115
af = AF_INET;
2116
}
2117
address = connect_to;
2118
2119
if(quit_now){
2120
goto end;
2121
}
2122
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
if (not quit_now){
2136
exitcode = EXIT_SUCCESS;
2137
}
2138
2139
goto end;
2140
}
2141
2142
if(quit_now){
2143
goto end;
2144
}
2145
2146
{
648
2147
AvahiServerConfig config;
649
AvahiSServiceBrowser *sb = NULL;
650
int error;
651
int ret;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
654
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
655
char *connect_to = NULL;
656
657
while (true){
658
static struct option long_options[] = {
659
{"debug", no_argument, (int *)&debug, 1},
660
{"connect", required_argument, 0, 'C'},
661
{"interface", required_argument, 0, 'i'},
662
{"certdir", required_argument, 0, 'd'},
663
{"certkey", required_argument, 0, 'c'},
664
{"certfile", required_argument, 0, 'k'},
665
{0, 0, 0, 0} };
666
667
int option_index = 0;
668
ret = getopt_long (argc, argv, "i:", long_options,
669
&option_index);
670
671
if (ret == -1){
672
break;
673
}
674
675
switch(ret){
676
case 0:
677
break;
678
case 'i':
679
interface = optarg;
680
break;
681
case 'C':
682
connect_to = optarg;
683
break;
684
case 'd':
685
certdir = optarg;
686
break;
687
case 'c':
688
certfile = optarg;
689
break;
690
case 'k':
691
certkey = optarg;
692
break;
693
default:
694
exit(EXIT_FAILURE);
695
}
696
}
697
698
certfile = combinepath(certdir, certfile);
699
if (certfile == NULL){
700
goto exit;
701
}
702
703
if(interface != NULL){
704
if_index = (AvahiIfIndex) if_nametoindex(interface);
705
if(if_index == 0){
706
fprintf(stderr, "No such interface: \"%s\"\n", interface);
707
exit(EXIT_FAILURE);
708
}
709
}
710
711
if(connect_to != NULL){
712
/* Connect directly, do not use Zeroconf */
713
/* (Mainly meant for debugging) */
714
char *address = strrchr(connect_to, ':');
715
if(address == NULL){
716
fprintf(stderr, "No colon in address\n");
717
exit(EXIT_FAILURE);
718
}
719
errno = 0;
720
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
721
if(errno){
722
perror("Bad port number");
723
exit(EXIT_FAILURE);
724
}
725
*address = '\0';
726
address = connect_to;
727
ret = start_mandos_communication(address, port, if_index);
728
if(ret < 0){
729
exit(EXIT_FAILURE);
730
} else {
731
exit(EXIT_SUCCESS);
732
}
733
}
734
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
737
goto exit;
738
}
739
740
if (not debug){
741
avahi_set_log_function(empty_log);
742
}
743
744
/* Initialize the psuedo-RNG */
745
srand((unsigned int) time(NULL));
746
747
/* Allocate main loop object */
748
if (!(simple_poll = avahi_simple_poll_new())) {
749
fprintf(stderr, "Failed to create simple poll object.\n");
750
751
goto exit;
752
}
753
754
/* Do not publish any local records */
2148
/* Do not publish any local Zeroconf records */
755
2149
avahi_server_config_init(&config);
756
2150
config.publish_hinfo = 0;
757
2151
config.publish_addresses = 0;
758
2152
config.publish_workstation = 0;
759
2153
config.publish_domain = 0;
760
2154
761
2155
/* Allocate a new server */
762
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
763
&config, NULL, NULL, &error);
764
765
/* Free the configuration data */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2159
2160
/* Free the Avahi configuration data */
766
2161
avahi_server_config_free(&config);
767
768
/* Check if creating the server object succeeded */
769
if (!server) {
770
fprintf(stderr, "Failed to create server: %s\n",
771
avahi_strerror(error));
772
returncode = EXIT_FAILURE;
773
goto exit;
774
}
775
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
778
AVAHI_PROTO_INET6,
779
"_mandos._tcp", NULL, 0,
780
browse_callback, server);
781
if (!sb) {
782
fprintf(stderr, "Failed to create service browser: %s\n",
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
785
goto exit;
786
}
787
788
/* Run the main loop */
789
790
if (debug){
791
fprintf(stderr, "Starting avahi loop search\n");
792
}
793
794
avahi_simple_poll_loop(simple_poll);
795
796
exit:
797
798
if (debug){
799
fprintf(stderr, "%s exiting\n", argv[0]);
800
}
801
802
/* Cleanup things */
803
if (sb)
804
avahi_s_service_browser_free(sb);
805
806
if (server)
807
avahi_server_free(server);
808
809
if (simple_poll)
810
avahi_simple_poll_free(simple_poll);
811
free(certfile);
812
free(certkey);
813
814
return returncode;
2162
}
2163
2164
/* Check if creating the Avahi server object succeeded */
2165
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
2173
goto end;
2174
}
2175
2176
/* Create the Avahi service browser */
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2180
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2183
exitcode = EX_UNAVAILABLE;
2184
goto end;
2185
}
2186
2187
if(quit_now){
2188
goto end;
2189
}
2190
2191
/* Run the main loop */
2192
2193
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
2203
2204
end:
2205
2206
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2208
}
2209
2210
/* Cleanup things */
2211
if(sb != NULL)
2212
avahi_s_service_browser_free(sb);
2213
2214
if(mc.server != NULL)
2215
avahi_server_free(mc.server);
2216
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2219
2220
if(gnutls_initialized){
2221
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
gnutls_dh_params_deinit(mc.dh_params);
2224
}
2225
2226
if(gpgme_initialized){
2227
gpgme_release(mc.ctx);
2228
}
2229
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
2268
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
2277
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
2311
}
2312
2313
if(quit_now){
2314
sigemptyset(&old_sigterm_action.sa_mask);
2315
old_sigterm_action.sa_handler = SIG_DFL;
2316
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2317
&old_sigterm_action,
2318
NULL));
2319
if(ret == -1){
2320
perror_plus("sigaction");
2321
}
2322
do {
2323
ret = raise(signal_received);
2324
} while(ret != 0 and errno == EINTR);
2325
if(ret != 0){
2326
perror_plus("raise");
2327
abort();
2328
}
2329
TEMP_FAILURE_RETRY(pause());
2330
}
2331
2332
return exitcode;
815
2333
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0