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- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- mto: (237.7.89 trunk) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
125
71
static int dh_bits = 1024;
72
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.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"
76
130
77
131
bool debug = false;
78
79
/* Used for */
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 */
80
151
typedef struct {
81
gnutls_session_t session;
152
AvahiSimplePoll *simple_poll;
153
AvahiServer *server;
82
154
gnutls_certificate_credentials_t cred;
155
unsigned int dh_bits;
83
156
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
89
const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
157
const char *priority;
91
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
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
188
/*
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
* bytes. "buffer_capacity" is how much is currently allocated,
191
* "buffer_length" is how much is already used.
192
*/
193
size_t incbuffer(char **buffer, size_t buffer_length,
194
size_t buffer_capacity){
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
198
return 0;
199
}
200
buffer_capacity += BUFFER_SIZE;
201
}
202
return buffer_capacity;
203
}
204
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
208
int ret;
209
server *new_server = malloc(sizeof(server));
210
if(new_server == NULL){
211
perror_plus("malloc");
212
return false;
213
}
214
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
218
if(new_server->ip == NULL){
219
perror_plus("strdup");
220
return false;
221
}
222
/* Special case of first server */
223
if (mc.current_server == NULL){
224
new_server->next = new_server;
225
new_server->prev = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
228
} else {
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
231
new_server->prev->next = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
238
}
239
return true;
240
}
241
242
/*
243
* Initialize GPGME.
244
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
92
247
gpgme_error_t rc;
93
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
96
248
gpgme_engine_info_t engine_info;
97
98
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
249
250
251
/*
252
* Helper function to insert pub and seckey to the engine keyring.
253
*/
254
bool import_key(const char *filename){
255
int ret;
256
int fd;
257
gpgme_data_t pgp_data;
258
259
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
260
if(fd == -1){
261
perror_plus("open");
262
return false;
263
}
264
265
rc = gpgme_data_new_from_fd(&pgp_data, fd);
266
if(rc != GPG_ERR_NO_ERROR){
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
269
return false;
270
}
271
272
rc = gpgme_op_import(mc.ctx, pgp_data);
273
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
276
return false;
277
}
278
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
if(ret == -1){
281
perror_plus("close");
282
}
283
gpgme_data_release(pgp_data);
284
return true;
285
}
286
287
if(debug){
288
fprintf_plus(stderr, "Initializing GPGME\n");
100
289
}
101
290
102
291
/* Init GPGME */
103
292
gpgme_check_version(NULL);
104
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
105
if (rc != GPG_ERR_NO_ERROR){
106
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
107
gpgme_strsource(rc), gpgme_strerror(rc));
108
return -1;
294
if(rc != GPG_ERR_NO_ERROR){
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
297
return false;
109
298
}
110
299
111
/* Set GPGME home directory */
112
rc = gpgme_get_engine_info (&engine_info);
113
if (rc != GPG_ERR_NO_ERROR){
114
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
115
gpgme_strsource(rc), gpgme_strerror(rc));
116
return -1;
300
/* Set GPGME home directory for the OpenPGP engine only */
301
rc = gpgme_get_engine_info(&engine_info);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
305
return false;
117
306
}
118
307
while(engine_info != NULL){
119
308
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
120
309
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
121
engine_info->file_name, homedir);
310
engine_info->file_name, tempdir);
122
311
break;
123
312
}
124
313
engine_info = engine_info->next;
125
314
}
126
315
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
return -1;
129
}
130
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
318
return false;
319
}
320
321
/* Create new GPGME "context" */
322
rc = gpgme_new(&(mc.ctx));
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
327
return false;
328
}
329
330
if(not import_key(pubkey) or not import_key(seckey)){
331
return false;
332
}
333
334
return true;
335
}
336
337
/*
338
* Decrypt OpenPGP data.
339
* Returns -1 on error
340
*/
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
size_t crypto_size,
343
char **plaintext){
344
gpgme_data_t dh_crypto, dh_plain;
345
gpgme_error_t rc;
346
ssize_t ret;
347
size_t plaintext_capacity = 0;
348
ssize_t plaintext_length = 0;
349
350
if(debug){
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
352
}
353
354
/* Create new GPGME data buffer from memory cryptotext */
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
0);
357
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
136
360
return -1;
137
361
}
138
362
139
363
/* Create new empty GPGME data buffer for the plaintext */
140
364
rc = gpgme_data_new(&dh_plain);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* Create new GPGME "context" */
148
rc = gpgme_new(&ctx);
149
if (rc != GPG_ERR_NO_ERROR){
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
153
}
154
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
if (rc != GPG_ERR_NO_ERROR){
159
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
162
}
163
164
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
}
167
168
if (debug){
169
gpgme_decrypt_result_t result;
170
result = gpgme_op_decrypt_result(ctx);
171
if (result == NULL){
172
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
173
} else {
174
fprintf(stderr, "Unsupported algorithm: %s\n",
175
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
177
result->wrong_key_usage);
178
if(result->file_name != NULL){
179
fprintf(stderr, "File name: %s\n", result->file_name);
180
}
181
gpgme_recipient_t recipient;
182
recipient = result->recipients;
183
if(recipient){
365
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
369
gpgme_data_release(dh_crypto);
370
return -1;
371
}
372
373
/* Decrypt data from the cryptotext data buffer to the plaintext
374
data buffer */
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
376
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
379
plaintext_length = -1;
380
if(debug){
381
gpgme_decrypt_result_t result;
382
result = gpgme_op_decrypt_result(mc.ctx);
383
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
} else {
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
390
if(result->file_name != NULL){
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
392
}
393
gpgme_recipient_t recipient;
394
recipient = result->recipients;
184
395
while(recipient != NULL){
185
fprintf(stderr, "Public key algorithm: %s\n",
186
gpgme_pubkey_algo_name(recipient->pubkey_algo));
187
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
188
fprintf(stderr, "Secret key available: %s\n",
189
recipient->status == GPG_ERR_NO_SECKEY
190
? "No" : "Yes");
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
191
403
recipient = recipient->next;
192
404
}
193
405
}
194
406
}
407
goto decrypt_end;
195
408
}
196
409
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
410
if(debug){
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
412
}
199
413
200
414
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
perror("pgpme_data_seek");
415
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
416
perror_plus("gpgme_data_seek");
417
plaintext_length = -1;
418
goto decrypt_end;
203
419
}
204
420
205
*new_packet = 0;
421
*plaintext = NULL;
206
422
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
423
plaintext_capacity = incbuffer(plaintext,
424
(size_t)plaintext_length,
425
plaintext_capacity);
426
if(plaintext_capacity == 0){
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
216
430
}
217
431
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
433
BUFFER_SIZE);
220
434
/* Print the data, if any */
221
if (ret == 0){
435
if(ret == 0){
436
/* EOF */
222
437
break;
223
438
}
224
439
if(ret < 0){
225
perror("gpgme_data_read");
226
return -1;
227
}
228
new_packet_length += ret;
229
}
230
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
440
perror_plus("gpgme_data_read");
441
plaintext_length = -1;
442
goto decrypt_end;
443
}
444
plaintext_length += ret;
445
}
446
447
if(debug){
448
fprintf_plus(stderr, "Decrypted password is: ");
449
for(ssize_t i = 0; i < plaintext_length; i++){
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
}
452
fprintf(stderr, "\n");
453
}
454
455
decrypt_end:
456
457
/* Delete the GPGME cryptotext data buffer */
458
gpgme_data_release(dh_crypto);
238
459
239
460
/* Delete the GPGME plaintext data buffer */
240
461
gpgme_data_release(dh_plain);
241
return new_packet_length;
462
return plaintext_length;
242
463
}
243
464
244
static const char * safer_gnutls_strerror (int value) {
245
const char *ret = gnutls_strerror (value);
246
if (ret == NULL)
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
468
if(ret == NULL)
247
469
ret = "(unknown)";
248
470
return ret;
249
471
}
250
472
473
/* GnuTLS log function callback */
251
474
static void debuggnutls(__attribute__((unused)) int level,
252
475
const char* string){
253
fprintf(stderr, "%s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
254
477
}
255
478
256
static int initgnutls(encrypted_session *es){
257
const char *err;
479
static int init_gnutls_global(const char *pubkeyfilename,
480
const char *seckeyfilename){
258
481
int ret;
259
482
260
483
if(debug){
261
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
262
485
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
486
487
ret = gnutls_global_init();
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
267
491
return -1;
268
492
}
269
270
if (debug){
493
494
if(debug){
495
/* "Use a log level over 10 to enable all debugging options."
496
* - GnuTLS manual
497
*/
271
498
gnutls_global_set_log_level(11);
272
499
gnutls_global_set_log_function(debuggnutls);
273
500
}
274
501
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
279
safer_gnutls_strerror(ret));
502
/* OpenPGP credentials */
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
504
if(ret != GNUTLS_E_SUCCESS){
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
507
gnutls_global_deinit();
280
508
return -1;
281
509
}
282
510
283
511
if(debug){
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
286
seckeyfile);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
287
516
}
288
517
289
518
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, pubkeyfile, seckeyfile);
296
fprintf(stdout, "The Error is: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, dh_bits))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
321
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
safer_gnutls_strerror(ret));
323
}
324
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
331
}
332
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
337
safer_gnutls_strerror(ret));
519
(mc.cred, pubkeyfilename, seckeyfilename,
520
GNUTLS_OPENPGP_FMT_BASE64);
521
if(ret != GNUTLS_E_SUCCESS){
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
527
goto globalfail;
528
}
529
530
/* GnuTLS server initialization */
531
ret = gnutls_dh_params_init(&mc.dh_params);
532
if(ret != GNUTLS_E_SUCCESS){
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
536
goto globalfail;
537
}
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
542
goto globalfail;
543
}
544
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
546
547
return 0;
548
549
globalfail:
550
551
gnutls_certificate_free_credentials(mc.cred);
552
gnutls_global_deinit();
553
gnutls_dh_params_deinit(mc.dh_params);
554
return -1;
555
}
556
557
static int init_gnutls_session(gnutls_session_t *session){
558
int ret;
559
/* GnuTLS session creation */
560
do {
561
ret = gnutls_init(session, GNUTLS_SERVER);
562
if(quit_now){
563
return -1;
564
}
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
570
}
571
572
{
573
const char *err;
574
do {
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
if(quit_now){
577
gnutls_deinit(*session);
578
return -1;
579
}
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
581
if(ret != GNUTLS_E_SUCCESS){
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
585
gnutls_deinit(*session);
586
return -1;
587
}
588
}
589
590
do {
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
592
mc.cred);
593
if(quit_now){
594
gnutls_deinit(*session);
595
return -1;
596
}
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
598
if(ret != GNUTLS_E_SUCCESS){
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
601
gnutls_deinit(*session);
338
602
return -1;
339
603
}
340
604
341
605
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
343
GNUTLS_CERT_IGNORE);
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
344
607
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
346
609
347
610
return 0;
348
611
}
349
612
613
/* Avahi log function callback */
350
614
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
615
__attribute__((unused)) const char *txt){}
352
616
617
/* Called when a Mandos server is found */
353
618
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
355
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
619
AvahiIfIndex if_index,
620
int af){
621
int ret, tcp_sd = -1;
622
ssize_t sret;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
358
627
char *buffer = NULL;
359
char *decrypted_buffer;
628
char *decrypted_buffer = NULL;
360
629
size_t buffer_length = 0;
361
630
size_t buffer_capacity = 0;
362
ssize_t decrypted_buffer_size;
363
size_t written = 0;
364
int retval = 0;
365
char interface[IF_NAMESIZE];
366
367
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
370
}
371
372
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
373
if(tcp_sd < 0) {
374
perror("socket");
375
return -1;
376
}
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
380
perror("if_indextoname");
381
}
382
return -1;
383
}
384
385
if(debug){
386
fprintf(stderr, "Binding to interface %s\n", interface);
387
}
388
389
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
392
if (ret < 0 ){
393
perror("inet_pton");
394
return -1;
395
}
631
size_t written;
632
int retval = -1;
633
gnutls_session_t session;
634
int pf; /* Protocol family */
635
636
errno = 0;
637
638
if(quit_now){
639
errno = EINTR;
640
return -1;
641
}
642
643
switch(af){
644
case AF_INET6:
645
pf = PF_INET6;
646
break;
647
case AF_INET:
648
pf = PF_INET;
649
break;
650
default:
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
652
errno = EINVAL;
653
return -1;
654
}
655
656
ret = init_gnutls_session(&session);
657
if(ret != 0){
658
return -1;
659
}
660
661
if(debug){
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
664
}
665
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
667
if(tcp_sd < 0){
668
int e = errno;
669
perror_plus("socket");
670
errno = e;
671
goto mandos_end;
672
}
673
674
if(quit_now){
675
errno = EINTR;
676
goto mandos_end;
677
}
678
679
memset(&to, 0, sizeof(to));
680
if(af == AF_INET6){
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
683
} else { /* IPv4 */
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
686
}
687
if(ret < 0 ){
688
int e = errno;
689
perror_plus("inet_pton");
690
errno = e;
691
goto mandos_end;
692
}
396
693
if(ret == 0){
397
fprintf(stderr, "Bad address: %s\n", ip);
398
return -1;
399
}
400
to.sin6_port = htons(port); /* Spurious warning */
694
int e = errno;
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
696
errno = e;
697
goto mandos_end;
698
}
699
if(af == AF_INET6){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
707
if(if_index == AVAHI_IF_UNSPEC){
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
710
errno = EINVAL;
711
goto mandos_end;
712
}
713
/* Set the network interface number as scope */
714
to.in6.sin6_scope_id = (uint32_t)if_index;
715
}
716
} else {
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
720
}
401
721
402
to.sin6_scope_id = (uint32_t)if_index;
722
if(quit_now){
723
errno = EINTR;
724
goto mandos_end;
725
}
403
726
404
727
if(debug){
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
char addrstr[INET6_ADDRSTRLEN] = "";
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
408
sizeof(addrstr)) == NULL){
409
perror("inet_ntop");
728
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
729
char interface[IF_NAMESIZE];
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
perror_plus("if_indextoname");
732
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
735
}
736
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
739
}
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
410
752
} else {
411
753
if(strcmp(addrstr, ip) != 0){
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
414
}
415
}
416
}
417
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
419
if (ret < 0){
420
perror("connect");
421
return -1;
422
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
428
}
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
756
}
757
}
758
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
769
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
const char *out = mandos_protocol_version;
784
written = 0;
785
while(true){
786
size_t out_size = strlen(out);
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
788
out_size - written));
789
if(ret == -1){
790
int e = errno;
791
perror_plus("write");
792
errno = e;
793
goto mandos_end;
794
}
795
written += (size_t)ret;
796
if(written < out_size){
797
continue;
798
} else {
799
if(out == mandos_protocol_version){
800
written = 0;
801
out = "\r\n";
802
} else {
803
break;
804
}
805
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
}
432
812
433
813
if(debug){
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
}
436
437
ret = gnutls_handshake (es.session);
438
439
if (ret != GNUTLS_E_SUCCESS){
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
820
}
821
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
824
825
if(quit_now){
826
errno = EINTR;
827
goto mandos_end;
828
}
829
830
do {
831
ret = gnutls_handshake(session);
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
837
838
if(ret != GNUTLS_E_SUCCESS){
440
839
if(debug){
441
fprintf(stderr, "\n*** Handshake failed ***\n");
442
gnutls_perror (ret);
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
841
gnutls_perror(ret);
443
842
}
444
retval = -1;
445
goto exit;
843
errno = EPROTO;
844
goto mandos_end;
446
845
}
447
846
448
//Retrieve OpenPGP packet that contains the wanted password
847
/* Read OpenPGP packet that contains the wanted password */
449
848
450
849
if(debug){
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
452
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
453
852
}
454
853
455
854
while(true){
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
if (buffer == NULL){
459
perror("realloc");
460
goto exit;
461
}
462
buffer_capacity += BUFFER_SIZE;
463
}
464
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
467
if (ret == 0){
855
856
if(quit_now){
857
errno = EINTR;
858
goto mandos_end;
859
}
860
861
buffer_capacity = incbuffer(&buffer, buffer_length,
862
buffer_capacity);
863
if(buffer_capacity == 0){
864
int e = errno;
865
perror_plus("incbuffer");
866
errno = e;
867
goto mandos_end;
868
}
869
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
874
875
sret = gnutls_record_recv(session, buffer+buffer_length,
876
BUFFER_SIZE);
877
if(sret == 0){
468
878
break;
469
879
}
470
if (ret < 0){
471
switch(ret){
880
if(sret < 0){
881
switch(sret){
472
882
case GNUTLS_E_INTERRUPTED:
473
883
case GNUTLS_E_AGAIN:
474
884
break;
475
885
case GNUTLS_E_REHANDSHAKE:
476
ret = gnutls_handshake (es.session);
477
if (ret < 0){
478
fprintf(stderr, "\n*** Handshake failed ***\n");
479
gnutls_perror (ret);
480
retval = -1;
481
goto exit;
886
do {
887
ret = gnutls_handshake(session);
888
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
if(ret < 0){
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
897
gnutls_perror(ret);
898
errno = EPROTO;
899
goto mandos_end;
482
900
}
483
901
break;
484
902
default:
485
fprintf(stderr, "Unknown error while reading data from"
486
" encrypted session with mandos server\n");
487
retval = -1;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
906
errno = EIO;
907
goto mandos_end;
490
908
}
491
909
} else {
492
buffer_length += (size_t) ret;
493
}
494
}
495
496
if (buffer_length > 0){
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
498
buffer_length,
499
&decrypted_buffer,
500
keydir);
501
if (decrypted_buffer_size >= 0){
910
buffer_length += (size_t) sret;
911
}
912
}
913
914
if(debug){
915
fprintf_plus(stderr, "Closing TLS session\n");
916
}
917
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
do {
924
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
930
931
if(buffer_length > 0){
932
ssize_t decrypted_buffer_size;
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
&decrypted_buffer);
935
if(decrypted_buffer_size >= 0){
936
937
written = 0;
502
938
while(written < (size_t) decrypted_buffer_size){
503
ret = (int)fwrite (decrypted_buffer + written, 1,
504
(size_t)decrypted_buffer_size - written,
505
stdout);
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
ret = (int)fwrite(decrypted_buffer + written, 1,
945
(size_t)decrypted_buffer_size - written,
946
stdout);
506
947
if(ret == 0 and ferror(stdout)){
948
int e = errno;
507
949
if(debug){
508
fprintf(stderr, "Error writing encrypted data: %s\n",
509
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
510
952
}
511
retval = -1;
512
break;
953
errno = e;
954
goto mandos_end;
513
955
}
514
956
written += (size_t)ret;
515
957
}
516
free(decrypted_buffer);
517
} else {
958
retval = 0;
959
}
960
}
961
962
/* Shutdown procedure */
963
964
mandos_end:
965
{
966
int e = errno;
967
free(decrypted_buffer);
968
free(buffer);
969
if(tcp_sd >= 0){
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
971
}
972
if(ret == -1){
973
if(e == 0){
974
e = errno;
975
}
976
perror_plus("close");
977
}
978
gnutls_deinit(session);
979
errno = e;
980
if(quit_now){
981
errno = EINTR;
518
982
retval = -1;
519
983
}
520
984
}
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
528
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
531
close(tcp_sd);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
535
985
return retval;
536
986
}
537
987
538
static AvahiSimplePoll *simple_poll = NULL;
539
static AvahiServer *server = NULL;
540
541
static void resolve_callback(
542
AvahiSServiceResolver *r,
543
AvahiIfIndex interface,
544
AVAHI_GCC_UNUSED AvahiProtocol protocol,
545
AvahiResolverEvent event,
546
const char *name,
547
const char *type,
548
const char *domain,
549
const char *host_name,
550
const AvahiAddress *address,
551
uint16_t port,
552
AVAHI_GCC_UNUSED AvahiStringList *txt,
553
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
554
AVAHI_GCC_UNUSED void* userdata) {
555
556
assert(r); /* Spurious warning */
988
static void resolve_callback(AvahiSServiceResolver *r,
989
AvahiIfIndex interface,
990
AvahiProtocol proto,
991
AvahiResolverEvent event,
992
const char *name,
993
const char *type,
994
const char *domain,
995
const char *host_name,
996
const AvahiAddress *address,
997
uint16_t port,
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
flags,
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
557
1003
558
1004
/* Called whenever a service has been resolved successfully or
559
1005
timed out */
560
1006
561
switch (event) {
1007
if(quit_now){
1008
return;
1009
}
1010
1011
switch(event){
562
1012
default:
563
1013
case AVAHI_RESOLVER_FAILURE:
564
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
565
" type '%s' in domain '%s': %s\n", name, type, domain,
566
avahi_strerror(avahi_server_errno(server)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
567
1018
break;
568
1019
569
1020
case AVAHI_RESOLVER_FOUND:
571
1022
char ip[AVAHI_ADDRESS_STR_MAX];
572
1023
avahi_address_snprint(ip, sizeof(ip), address);
573
1024
if(debug){
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
576
1028
}
577
int ret = start_mandos_communication(ip, port, interface);
578
if (ret == 0){
579
exit(EXIT_SUCCESS);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1031
if(ret == 0){
1032
avahi_simple_poll_quit(mc.simple_poll);
1033
} else {
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
580
1039
}
581
1040
}
582
1041
}
583
1042
avahi_s_service_resolver_free(r);
584
1043
}
585
1044
586
static void browse_callback(
587
AvahiSServiceBrowser *b,
588
AvahiIfIndex interface,
589
AvahiProtocol protocol,
590
AvahiBrowserEvent event,
591
const char *name,
592
const char *type,
593
const char *domain,
594
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
595
void* userdata) {
596
597
AvahiServer *s = userdata;
598
assert(b); /* Spurious warning */
599
600
/* Called whenever a new services becomes available on the LAN or
601
is removed from the LAN */
602
603
switch (event) {
1045
static void browse_callback(AvahiSServiceBrowser *b,
1046
AvahiIfIndex interface,
1047
AvahiProtocol protocol,
1048
AvahiBrowserEvent event,
1049
const char *name,
1050
const char *type,
1051
const char *domain,
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1053
flags,
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1056
1057
/* Called whenever a new services becomes available on the LAN or
1058
is removed from the LAN */
1059
1060
if(quit_now){
1061
return;
1062
}
1063
1064
switch(event){
1065
default:
1066
case AVAHI_BROWSER_FAILURE:
1067
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1071
return;
1072
1073
case AVAHI_BROWSER_NEW:
1074
/* We ignore the returned Avahi resolver object. In the callback
1075
function we free it. If the Avahi server is terminated before
1076
the callback function is called the Avahi server will free the
1077
resolver for us. */
1078
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1085
break;
1086
1087
case AVAHI_BROWSER_REMOVE:
1088
break;
1089
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1092
if(debug){
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
1095
}
1096
break;
1097
}
1098
}
1099
1100
/* Signal handler that stops main loop after SIGTERM */
1101
static void handle_sigterm(int sig){
1102
if(quit_now){
1103
return;
1104
}
1105
quit_now = 1;
1106
signal_received = sig;
1107
int old_errno = errno;
1108
/* set main loop to exit */
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1111
}
1112
errno = old_errno;
1113
}
1114
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1126
if(debug){
1127
perror_plus("ioctl SIOCGIFFLAGS");
1128
}
1129
return false;
1130
}
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1136
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1141
}
1142
return false;
1143
}
1144
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1146
if(debug){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1149
}
1150
return true;
1151
}
1152
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1157
}
1158
return false;
1159
}
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1162
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1165
}
1166
return false;
1167
}
1168
1169
/* Accept this device */
1170
if(debug){
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1244
int notdotentries(const struct dirent *direntry){
1245
/* Skip "." and ".." */
1246
if(direntry->d_name[0] == '.'
1247
and (direntry->d_name[1] == '\0'
1248
or (direntry->d_name[1] == '.'
1249
and direntry->d_name[2] == '\0'))){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
int ret;
1318
struct timespec now;
1319
struct timespec waited_time;
1320
intmax_t block_time;
1321
1322
while(true){
1323
if(mc.current_server == NULL){
1324
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1327
}
1328
ret = avahi_simple_poll_iterate(s, -1);
1329
} else {
1330
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1333
}
1334
/* the current time */
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1336
if(ret == -1){
1337
perror_plus("clock_gettime");
1338
return -1;
1339
}
1340
/* Calculating in ms how long time between now and server
1341
who we visted longest time ago. Now - last seen. */
1342
waited_time.tv_sec = (now.tv_sec
1343
- mc.current_server->last_seen.tv_sec);
1344
waited_time.tv_nsec = (now.tv_nsec
1345
- mc.current_server->last_seen.tv_nsec);
1346
/* total time is 10s/10,000ms.
1347
Converting to s from ms by dividing by 1,000,
1348
and ns to ms by dividing by 1,000,000. */
1349
block_time = ((retry_interval
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1353
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1356
}
1357
1358
if(block_time <= 0){
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1363
if(ret == 0){
1364
avahi_simple_poll_quit(mc.simple_poll);
1365
return 0;
1366
}
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1368
&mc.current_server->last_seen);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
mc.current_server = mc.current_server->next;
1374
block_time = 0; /* Call avahi to find new Mandos
1375
servers, but don't block */
1376
}
1377
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
}
1380
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1382
return (ret != 1) ? ret : 0;
1383
}
1384
}
1385
}
1386
}
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
1517
int main(int argc, char *argv[]){
1518
AvahiSServiceBrowser *sb = NULL;
1519
int error;
1520
int ret;
1521
intmax_t tmpmax;
1522
char *tmp;
1523
int exitcode = EXIT_SUCCESS;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1533
const char *seckey = PATHDIR "/" SECKEY;
1534
const char *pubkey = PATHDIR "/" PUBKEY;
1535
1536
bool gnutls_initialized = false;
1537
bool gpgme_initialized = false;
1538
float delay = 2.5f;
1539
double retry_interval = 10; /* 10s between trying a server and
1540
retrying the same server again */
1541
1542
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1543
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1544
1545
uid = getuid();
1546
gid = getgid();
1547
1548
/* Lower any group privileges we might have, just to be safe */
1549
errno = 0;
1550
ret = setgid(gid);
1551
if(ret == -1){
1552
perror_plus("setgid");
1553
}
1554
1555
/* Lower user privileges (temporarily) */
1556
errno = 0;
1557
ret = seteuid(uid);
1558
if(ret == -1){
1559
perror_plus("seteuid");
1560
}
1561
1562
if(quit_now){
1563
goto end;
1564
}
1565
1566
{
1567
struct argp_option options[] = {
1568
{ .name = "debug", .key = 128,
1569
.doc = "Debug mode", .group = 3 },
1570
{ .name = "connect", .key = 'c',
1571
.arg = "ADDRESS:PORT",
1572
.doc = "Connect directly to a specific Mandos server",
1573
.group = 1 },
1574
{ .name = "interface", .key = 'i',
1575
.arg = "NAME",
1576
.doc = "Network interface that will be used to search for"
1577
" Mandos servers",
1578
.group = 1 },
1579
{ .name = "seckey", .key = 's',
1580
.arg = "FILE",
1581
.doc = "OpenPGP secret key file base name",
1582
.group = 1 },
1583
{ .name = "pubkey", .key = 'p',
1584
.arg = "FILE",
1585
.doc = "OpenPGP public key file base name",
1586
.group = 2 },
1587
{ .name = "dh-bits", .key = 129,
1588
.arg = "BITS",
1589
.doc = "Bit length of the prime number used in the"
1590
" Diffie-Hellman key exchange",
1591
.group = 2 },
1592
{ .name = "priority", .key = 130,
1593
.arg = "STRING",
1594
.doc = "GnuTLS priority string for the TLS handshake",
1595
.group = 1 },
1596
{ .name = "delay", .key = 131,
1597
.arg = "SECONDS",
1598
.doc = "Maximum delay to wait for interface startup",
1599
.group = 2 },
1600
{ .name = "retry", .key = 132,
1601
.arg = "SECONDS",
1602
.doc = "Retry interval used when denied by the mandos server",
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1608
/*
1609
* These reproduce what we would get without ARGP_NO_HELP
1610
*/
1611
{ .name = "help", .key = '?',
1612
.doc = "Give this help list", .group = -1 },
1613
{ .name = "usage", .key = -3,
1614
.doc = "Give a short usage message", .group = -1 },
1615
{ .name = "version", .key = 'V',
1616
.doc = "Print program version", .group = -1 },
1617
{ .name = NULL }
1618
};
1619
1620
error_t parse_opt(int key, char *arg,
1621
struct argp_state *state){
1622
errno = 0;
1623
switch(key){
1624
case 128: /* --debug */
1625
debug = true;
1626
break;
1627
case 'c': /* --connect */
1628
connect_to = arg;
1629
break;
1630
case 'i': /* --interface */
1631
interface = arg;
1632
break;
1633
case 's': /* --seckey */
1634
seckey = arg;
1635
break;
1636
case 'p': /* --pubkey */
1637
pubkey = arg;
1638
break;
1639
case 129: /* --dh-bits */
1640
errno = 0;
1641
tmpmax = strtoimax(arg, &tmp, 10);
1642
if(errno != 0 or tmp == arg or *tmp != '\0'
1643
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1644
argp_error(state, "Bad number of DH bits");
1645
}
1646
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1647
break;
1648
case 130: /* --priority */
1649
mc.priority = arg;
1650
break;
1651
case 131: /* --delay */
1652
errno = 0;
1653
delay = strtof(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'){
1655
argp_error(state, "Bad delay");
1656
}
1657
case 132: /* --retry */
1658
errno = 0;
1659
retry_interval = strtod(arg, &tmp);
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1663
argp_error(state, "Bad retry interval");
1664
}
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1669
/*
1670
* These reproduce what we would get without ARGP_NO_HELP
1671
*/
1672
case '?': /* --help */
1673
argp_state_help(state, state->out_stream,
1674
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1675
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1676
case -3: /* --usage */
1677
argp_state_help(state, state->out_stream,
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1679
case 'V': /* --version */
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1681
exit(argp_err_exit_status);
1682
break;
1683
default:
1684
return ARGP_ERR_UNKNOWN;
1685
}
1686
return errno;
1687
}
1688
1689
struct argp argp = { .options = options, .parser = parse_opt,
1690
.args_doc = "",
1691
.doc = "Mandos client -- Get and decrypt"
1692
" passwords from a Mandos server" };
1693
ret = argp_parse(&argp, argc, argv,
1694
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1695
switch(ret){
1696
case 0:
1697
break;
1698
case ENOMEM:
604
1699
default:
605
case AVAHI_BROWSER_FAILURE:
606
607
fprintf(stderr, "(Browser) %s\n",
608
avahi_strerror(avahi_server_errno(server)));
609
avahi_simple_poll_quit(simple_poll);
610
return;
611
612
case AVAHI_BROWSER_NEW:
613
/* We ignore the returned resolver object. In the callback
614
function we free it. If the server is terminated before
615
the callback function is called the server will free
616
the resolver for us. */
617
618
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
619
type, domain,
620
AVAHI_PROTO_INET6, 0,
621
resolve_callback, s)))
622
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
623
avahi_strerror(avahi_server_errno(s)));
624
break;
625
626
case AVAHI_BROWSER_REMOVE:
627
break;
628
629
case AVAHI_BROWSER_ALL_FOR_NOW:
630
case AVAHI_BROWSER_CACHE_EXHAUSTED:
631
break;
632
}
633
}
634
635
/* Combines file name and path and returns the malloced new
636
string. some sane checks could/should be added */
637
static const char *combinepath(const char *first, const char *second){
638
size_t f_len = strlen(first);
639
size_t s_len = strlen(second);
640
char *tmp = malloc(f_len + s_len + 2);
641
if (tmp == NULL){
642
return NULL;
643
}
644
if(f_len > 0){
645
memcpy(tmp, first, f_len);
646
}
647
tmp[f_len] = '/';
648
if(s_len > 0){
649
memcpy(tmp + f_len + 1, second, s_len);
650
}
651
tmp[f_len + 1 + s_len] = '\0';
652
return tmp;
653
}
654
655
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
1700
errno = ret;
1701
perror_plus("argp_parse");
1702
exitcode = EX_OSERR;
1703
goto end;
1704
case EINVAL:
1705
exitcode = EX_USAGE;
1706
goto end;
1707
}
1708
}
1709
1710
{
1711
/* Work around Debian bug #633582:
1712
<http://bugs.debian.org/633582> */
1713
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1776
}
1777
1778
if(not debug){
1779
avahi_set_log_function(empty_log);
1780
}
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1815
from the signal handler */
1816
/* Initialize the pseudo-RNG for Avahi */
1817
srand((unsigned int) time(NULL));
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
sigemptyset(&sigterm_action.sa_mask);
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1828
if(ret == -1){
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1831
goto end;
1832
}
1833
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1834
if(ret == -1){
1835
perror_plus("sigaddset");
1836
exitcode = EX_OSERR;
1837
goto end;
1838
}
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1840
if(ret == -1){
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1843
goto end;
1844
}
1845
/* Need to check if the handler is SIG_IGN before handling:
1846
| [[info:libc:Initial Signal Actions]] |
1847
| [[info:libc:Basic Signal Handling]] |
1848
*/
1849
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1850
if(ret == -1){
1851
perror_plus("sigaction");
1852
return EX_OSERR;
1853
}
1854
if(old_sigterm_action.sa_handler != SIG_IGN){
1855
ret = sigaction(SIGINT, &sigterm_action, NULL);
1856
if(ret == -1){
1857
perror_plus("sigaction");
1858
exitcode = EX_OSERR;
1859
goto end;
1860
}
1861
}
1862
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1863
if(ret == -1){
1864
perror_plus("sigaction");
1865
return EX_OSERR;
1866
}
1867
if(old_sigterm_action.sa_handler != SIG_IGN){
1868
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1869
if(ret == -1){
1870
perror_plus("sigaction");
1871
exitcode = EX_OSERR;
1872
goto end;
1873
}
1874
}
1875
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1876
if(ret == -1){
1877
perror_plus("sigaction");
1878
return EX_OSERR;
1879
}
1880
if(old_sigterm_action.sa_handler != SIG_IGN){
1881
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1882
if(ret == -1){
1883
perror_plus("sigaction");
1884
exitcode = EX_OSERR;
1885
goto end;
1886
}
1887
}
1888
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
1974
}
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
1993
break;
1994
}
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
}
2025
2026
if(quit_now){
2027
goto end;
2028
}
2029
2030
ret = init_gnutls_global(pubkey, seckey);
2031
if(ret == -1){
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
2034
goto end;
2035
} else {
2036
gnutls_initialized = true;
2037
}
2038
2039
if(quit_now){
2040
goto end;
2041
}
2042
2043
if(mkdtemp(tempdir) == NULL){
2044
perror_plus("mkdtemp");
2045
goto end;
2046
}
2047
tempdir_created = true;
2048
2049
if(quit_now){
2050
goto end;
2051
}
2052
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2055
exitcode = EX_UNAVAILABLE;
2056
goto end;
2057
} else {
2058
gpgme_initialized = true;
2059
}
2060
2061
if(quit_now){
2062
goto end;
2063
}
2064
2065
if(connect_to != NULL){
2066
/* Connect directly, do not use Zeroconf */
2067
/* (Mainly meant for debugging) */
2068
char *address = strrchr(connect_to, ':');
2069
if(address == NULL){
2070
fprintf_plus(stderr, "No colon in address\n");
2071
exitcode = EX_USAGE;
2072
goto end;
2073
}
2074
2075
if(quit_now){
2076
goto end;
2077
}
2078
2079
uint16_t port;
2080
errno = 0;
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
or tmpmax != (uint16_t)tmpmax){
2084
fprintf_plus(stderr, "Bad port number\n");
2085
exitcode = EX_USAGE;
2086
goto end;
2087
}
2088
2089
if(quit_now){
2090
goto end;
2091
}
2092
2093
port = (uint16_t)tmpmax;
2094
*address = '\0';
2095
/* Colon in address indicates IPv6 */
2096
int af;
2097
if(strchr(connect_to, ':') != NULL){
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
2105
} else {
2106
af = AF_INET;
2107
}
2108
address = connect_to;
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
2114
while(not quit_now){
2115
ret = start_mandos_communication(address, port, if_index, af);
2116
if(quit_now or ret == 0){
2117
break;
2118
}
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
2126
if (not quit_now){
2127
exitcode = EXIT_SUCCESS;
2128
}
2129
2130
goto end;
2131
}
2132
2133
if(quit_now){
2134
goto end;
2135
}
2136
2137
{
657
2138
AvahiServerConfig config;
658
AvahiSServiceBrowser *sb = NULL;
659
int error;
660
int ret;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
char *connect_to = NULL;
666
667
debug_int = debug ? 1 : 0;
668
while (true){
669
static struct option long_options[] = {
670
{"debug", no_argument, &debug_int, 1},
671
{"connect", required_argument, NULL, 'C'},
672
{"interface", required_argument, NULL, 'i'},
673
{"keydir", required_argument, NULL, 'd'},
674
{"seckey", required_argument, NULL, 'c'},
675
{"pubkey", required_argument, NULL, 'k'},
676
{"dh-bits", required_argument, NULL, 'D'},
677
{0, 0, 0, 0} };
678
679
int option_index = 0;
680
ret = getopt_long (argc, argv, "i:", long_options,
681
&option_index);
682
683
if (ret == -1){
684
break;
685
}
686
687
switch(ret){
688
case 0:
689
break;
690
case 'i':
691
interface = optarg;
692
break;
693
case 'C':
694
connect_to = optarg;
695
break;
696
case 'd':
697
keydir = optarg;
698
break;
699
case 'c':
700
pubkeyfile = optarg;
701
break;
702
case 'k':
703
seckeyfile = optarg;
704
break;
705
case 'D':
706
dh_bits = atoi(optarg);
707
break;
708
case '?':
709
break
710
default:
711
exit(EXIT_FAILURE);
712
}
713
}
714
debug = debug_int ? true : false;
715
716
pubkeyfile = combinepath(keydir, pubkeyfile);
717
if (pubkeyfile == NULL){
718
perror("combinepath");
719
goto exit;
720
}
721
722
if(interface != NULL){
723
if_index = (AvahiIfIndex) if_nametoindex(interface);
724
if(if_index == 0){
725
fprintf(stderr, "No such interface: \"%s\"\n", interface);
726
exit(EXIT_FAILURE);
727
}
728
}
729
730
if(connect_to != NULL){
731
/* Connect directly, do not use Zeroconf */
732
/* (Mainly meant for debugging) */
733
char *address = strrchr(connect_to, ':');
734
if(address == NULL){
735
fprintf(stderr, "No colon in address\n");
736
exit(EXIT_FAILURE);
737
}
738
errno = 0;
739
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
740
if(errno){
741
perror("Bad port number");
742
exit(EXIT_FAILURE);
743
}
744
*address = '\0';
745
address = connect_to;
746
ret = start_mandos_communication(address, port, if_index);
747
if(ret < 0){
748
exit(EXIT_FAILURE);
749
} else {
750
exit(EXIT_SUCCESS);
751
}
752
}
753
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
758
}
759
760
if (not debug){
761
avahi_set_log_function(empty_log);
762
}
763
764
/* Initialize the psuedo-RNG */
765
srand((unsigned int) time(NULL));
766
767
/* Allocate main loop object */
768
if (!(simple_poll = avahi_simple_poll_new())) {
769
fprintf(stderr, "Failed to create simple poll object.\n");
770
771
goto exit;
772
}
773
774
/* Do not publish any local records */
2139
/* Do not publish any local Zeroconf records */
775
2140
avahi_server_config_init(&config);
776
2141
config.publish_hinfo = 0;
777
2142
config.publish_addresses = 0;
778
2143
config.publish_workstation = 0;
779
2144
config.publish_domain = 0;
780
2145
781
2146
/* Allocate a new server */
782
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
783
&config, NULL, NULL, &error);
784
785
/* Free the configuration data */
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2150
2151
/* Free the Avahi configuration data */
786
2152
avahi_server_config_free(&config);
787
788
/* Check if creating the server object succeeded */
789
if (!server) {
790
fprintf(stderr, "Failed to create server: %s\n",
791
avahi_strerror(error));
792
returncode = EXIT_FAILURE;
793
goto exit;
794
}
795
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
798
AVAHI_PROTO_INET6,
799
"_mandos._tcp", NULL, 0,
800
browse_callback, server);
801
if (!sb) {
802
fprintf(stderr, "Failed to create service browser: %s\n",
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
806
}
807
808
/* Run the main loop */
809
810
if (debug){
811
fprintf(stderr, "Starting avahi loop search\n");
812
}
813
814
avahi_simple_poll_loop(simple_poll);
815
816
exit:
817
818
if (debug){
819
fprintf(stderr, "%s exiting\n", argv[0]);
820
}
821
822
/* Cleanup things */
823
if (sb)
824
avahi_s_service_browser_free(sb);
825
826
if (server)
827
avahi_server_free(server);
828
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
831
free(pubkeyfile);
832
free(seckeyfile);
833
834
return returncode;
2153
}
2154
2155
/* Check if creating the Avahi server object succeeded */
2156
if(mc.server == NULL){
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
2159
exitcode = EX_UNAVAILABLE;
2160
goto end;
2161
}
2162
2163
if(quit_now){
2164
goto end;
2165
}
2166
2167
/* Create the Avahi service browser */
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
NULL, 0, browse_callback, NULL);
2171
if(sb == NULL){
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
2179
goto end;
2180
}
2181
2182
/* Run the main loop */
2183
2184
if(debug){
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
}
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2190
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
2193
}
2194
2195
end:
2196
2197
if(debug){
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2199
}
2200
2201
/* Cleanup things */
2202
if(sb != NULL)
2203
avahi_s_service_browser_free(sb);
2204
2205
if(mc.server != NULL)
2206
avahi_server_free(mc.server);
2207
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2210
2211
if(gnutls_initialized){
2212
gnutls_certificate_free_credentials(mc.cred);
2213
gnutls_global_deinit();
2214
gnutls_dh_params_deinit(mc.dh_params);
2215
}
2216
2217
if(gpgme_initialized){
2218
gpgme_release(mc.ctx);
2219
}
2220
2221
/* Cleans up the circular linked list of Mandos servers the client
2222
has seen */
2223
if(mc.current_server != NULL){
2224
mc.current_server->prev->next = NULL;
2225
while(mc.current_server != NULL){
2226
server *next = mc.current_server->next;
2227
free(mc.current_server);
2228
mc.current_server = next;
2229
}
2230
}
2231
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
2241
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
}
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2267
2268
/* Removes the GPGME temp directory and all files inside */
2269
if(tempdir_created){
2270
struct dirent **direntries = NULL;
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
2290
}
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
2301
}
2302
}
2303
2304
if(quit_now){
2305
sigemptyset(&old_sigterm_action.sa_mask);
2306
old_sigterm_action.sa_handler = SIG_DFL;
2307
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2308
&old_sigterm_action,
2309
NULL));
2310
if(ret == -1){
2311
perror_plus("sigaction");
2312
}
2313
do {
2314
ret = raise(signal_received);
2315
} while(ret != 0 and errno == EINTR);
2316
if(ret != 0){
2317
perror_plus("raise");
2318
abort();
2319
}
2320
TEMP_FAILURE_RETRY(pause());
2321
}
2322
2323
return exitcode;
835
2324
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0