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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#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 */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
56
struct in6_addr, inet_pton(),
57
connect() */
60
58
#include <fcntl.h> /* open() */
61
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
60
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#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() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
98
78
#ifdef __linux__
99
79
#include <sys/klog.h> /* klogctl() */
100
#endif /* __linux__ */
80
#endif
101
81
102
82
/* Avahi */
103
83
/* All Avahi types, constants and functions
117
97
init_gnutls_session(),
118
98
GNUTLS_* */
119
99
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
122
102
123
103
/* GPGME */
124
104
#include <gpgme.h> /* All GPGME types, constants and
132
112
#define PATHDIR "/conf/conf.d/mandos"
133
113
#define SECKEY "seckey.txt"
134
114
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
115
137
116
bool debug = false;
138
117
static const char mandos_protocol_version[] = "1";
139
118
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
120
158
121
/* Used for passing in values through the Avahi callback functions */
159
122
typedef struct {
123
AvahiSimplePoll *simple_poll;
160
124
AvahiServer *server;
161
125
gnutls_certificate_credentials_t cred;
162
126
unsigned int dh_bits;
163
127
gnutls_dh_params_t dh_params;
164
128
const char *priority;
165
129
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
130
} mandos_context;
170
131
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
132
/*
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
199
135
* "buffer_length" is how much is already used.
200
136
*/
201
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
203
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
if(buffer == NULL){
210
142
return 0;
211
143
}
212
*buffer = new_buf;
213
144
buffer_capacity += BUFFER_SIZE;
214
145
}
215
146
return buffer_capacity;
216
147
}
217
148
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
246
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
253
}
254
255
149
/*
256
150
* Initialize GPGME.
257
151
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
260
155
gpgme_error_t rc;
261
156
gpgme_engine_info_t engine_info;
262
157
158
263
159
/*
264
160
* Helper function to insert pub and seckey to the engine keyring.
265
161
*/
266
162
bool import_key(const char *filename){
267
int ret;
268
163
int fd;
269
164
gpgme_data_t pgp_data;
270
165
271
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
272
167
if(fd == -1){
273
perror_plus("open");
168
perror("open");
274
169
return false;
275
170
}
276
171
277
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
173
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
281
176
return false;
282
177
}
283
178
284
179
rc = gpgme_op_import(mc->ctx, pgp_data);
285
180
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
288
183
return false;
289
184
}
290
185
291
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
292
187
if(ret == -1){
293
perror_plus("close");
188
perror("close");
294
189
}
295
190
gpgme_data_release(pgp_data);
296
191
return true;
297
192
}
298
193
299
194
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
301
196
}
302
197
303
198
/* Init GPGME */
304
199
gpgme_check_version(NULL);
305
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
201
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
309
204
return false;
310
205
}
311
206
312
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
313
208
rc = gpgme_get_engine_info(&engine_info);
314
209
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
317
212
return false;
318
213
}
319
214
while(engine_info != NULL){
325
220
engine_info = engine_info->next;
326
221
}
327
222
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
330
224
return false;
331
225
}
332
226
333
227
/* Create new GPGME "context" */
334
228
rc = gpgme_new(&(mc->ctx));
335
229
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
339
232
return false;
340
233
}
341
234
343
236
return false;
344
237
}
345
238
346
return true;
239
return true;
347
240
}
348
241
349
242
/*
350
243
* Decrypt OpenPGP data.
351
244
* Returns -1 on error
352
245
*/
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
354
248
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
249
char **plaintext){
357
250
gpgme_data_t dh_crypto, dh_plain;
358
251
gpgme_error_t rc;
359
252
ssize_t ret;
361
254
ssize_t plaintext_length = 0;
362
255
363
256
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
365
258
}
366
259
367
260
/* Create new GPGME data buffer from memory cryptotext */
368
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
262
0);
370
263
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
373
266
return -1;
374
267
}
375
268
376
269
/* Create new empty GPGME data buffer for the plaintext */
377
270
rc = gpgme_data_new(&dh_plain);
378
271
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
382
274
gpgme_data_release(dh_crypto);
383
275
return -1;
384
276
}
387
279
data buffer */
388
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
389
281
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
392
284
plaintext_length = -1;
393
285
if(debug){
394
286
gpgme_decrypt_result_t result;
395
287
result = gpgme_op_decrypt_result(mc->ctx);
396
288
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
398
290
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
403
295
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
405
297
}
406
298
gpgme_recipient_t recipient;
407
299
recipient = result->recipients;
408
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
416
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
417
310
}
418
311
}
419
312
}
421
314
}
422
315
423
316
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
425
318
}
426
319
427
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
430
323
plaintext_length = -1;
431
324
goto decrypt_end;
432
325
}
433
326
434
327
*plaintext = NULL;
435
328
while(true){
436
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
439
332
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
443
336
}
444
337
445
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
343
break;
451
344
}
452
345
if(ret < 0){
453
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
454
347
plaintext_length = -1;
455
348
goto decrypt_end;
456
349
}
458
351
}
459
352
460
353
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
462
355
for(ssize_t i = 0; i < plaintext_length; i++){
463
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
357
}
476
369
}
477
370
478
371
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
480
374
if(ret == NULL)
481
375
ret = "(unknown)";
482
376
return ret;
485
379
/* GnuTLS log function callback */
486
380
static void debuggnutls(__attribute__((unused)) int level,
487
381
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
489
383
}
490
384
491
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
494
388
int ret;
495
389
496
390
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
498
392
}
499
393
500
394
ret = gnutls_global_init();
501
395
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
504
398
return -1;
505
399
}
506
400
513
407
}
514
408
515
409
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
517
411
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
520
417
gnutls_global_deinit();
521
418
return -1;
522
419
}
523
420
524
421
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
529
425
}
530
426
531
427
ret = gnutls_certificate_set_openpgp_key_file
532
428
(mc->cred, pubkeyfilename, seckeyfilename,
533
429
GNUTLS_OPENPGP_FMT_BASE64);
534
430
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
540
436
goto globalfail;
541
437
}
542
438
543
439
/* GnuTLS server initialization */
544
440
ret = gnutls_dh_params_init(&mc->dh_params);
545
441
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
549
444
goto globalfail;
550
445
}
551
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
447
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
555
450
goto globalfail;
556
451
}
557
452
567
462
return -1;
568
463
}
569
464
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
572
467
int ret;
573
468
/* GnuTLS session creation */
574
do {
575
ret = gnutls_init(session, GNUTLS_SERVER);
576
if(quit_now){
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
580
470
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
584
473
}
585
474
586
475
{
587
476
const char *err;
588
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
if(quit_now){
591
gnutls_deinit(*session);
592
return -1;
593
}
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
595
478
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
599
482
gnutls_deinit(*session);
600
483
return -1;
601
484
}
602
485
}
603
486
604
do {
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
607
if(quit_now){
608
gnutls_deinit(*session);
609
return -1;
610
}
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
612
489
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
615
492
gnutls_deinit(*session);
616
493
return -1;
617
494
}
618
495
619
496
/* ignore client certificate if any. */
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
621
499
622
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
501
629
507
__attribute__((unused)) const char *txt){}
630
508
631
509
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
510
static int start_mandos_communication(const char *ip, uint16_t port,
633
511
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
635
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
636
514
ssize_t sret;
637
union {
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
640
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
641
516
char *buffer = NULL;
642
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
643
518
size_t buffer_length = 0;
644
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
645
521
size_t written;
646
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
647
524
gnutls_session_t session;
648
int pf; /* Protocol family */
649
650
errno = 0;
651
652
if(quit_now){
653
errno = EINTR;
654
return -1;
655
}
656
657
switch(af){
658
case AF_INET6:
659
pf = PF_INET6;
660
break;
661
case AF_INET:
662
pf = PF_INET;
663
break;
664
default:
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
666
errno = EINVAL;
667
return -1;
668
}
669
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
525
526
ret = init_gnutls_session(mc, &session);
703
527
if(ret != 0){
704
528
return -1;
705
529
}
706
530
707
531
if(debug){
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
710
534
}
711
535
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
713
537
if(tcp_sd < 0){
714
int e = errno;
715
perror_plus("socket");
716
errno = e;
717
goto mandos_end;
538
perror("socket");
539
return -1;
718
540
}
719
541
720
if(quit_now){
721
errno = EINTR;
722
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
723
548
}
724
549
725
550
memset(&to, 0, sizeof(to));
726
if(af == AF_INET6){
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
729
} else { /* IPv4 */
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
732
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
733
555
if(ret < 0 ){
734
int e = errno;
735
perror_plus("inet_pton");
736
errno = e;
737
goto mandos_end;
556
perror("inet_pton");
557
return -1;
738
558
}
739
559
if(ret == 0){
740
int e = errno;
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
742
errno = e;
743
goto mandos_end;
744
}
745
if(af == AF_INET6){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
756
if(if_index == AVAHI_IF_UNSPEC){
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
759
errno = EINVAL;
760
goto mandos_end;
761
}
762
/* Set the network interface number as scope */
763
to.in6.sin6_scope_id = (uint32_t)if_index;
764
}
765
} else {
766
to.in.sin_port = htons(port);
767
}
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
562
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
564
-Wconversion and
565
-Wunreachable-code */
768
566
769
if(quit_now){
770
errno = EINTR;
771
goto mandos_end;
772
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
773
568
774
569
if(debug){
775
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
776
char interface[IF_NAMESIZE];
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
perror_plus("if_indextoname");
779
} else {
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
576
} else {
577
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
782
579
}
783
} else {
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
786
}
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
789
if(af == AF_INET6){
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
793
} else {
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
797
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
804
}
805
}
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
812
if(af == AF_INET6){
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
} else {
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
}
580
}
581
}
582
583
ret = connect(tcp_sd, &to.in, sizeof(to));
817
584
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
823
goto mandos_end;
824
}
825
826
if(quit_now){
827
errno = EINTR;
828
goto mandos_end;
585
perror("connect");
586
return -1;
829
587
}
830
588
831
589
const char *out = mandos_protocol_version;
833
591
while(true){
834
592
size_t out_size = strlen(out);
835
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
836
out_size - written));
594
out_size - written));
837
595
if(ret == -1){
838
int e = errno;
839
perror_plus("write");
840
errno = e;
596
perror("write");
597
retval = -1;
841
598
goto mandos_end;
842
599
}
843
600
written += (size_t)ret;
851
608
break;
852
609
}
853
610
}
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
611
}
860
612
861
613
if(debug){
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
863
}
864
865
if(quit_now){
866
errno = EINTR;
867
goto mandos_end;
868
}
869
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
875
876
if(quit_now){
877
errno = EINTR;
878
goto mandos_end;
879
}
880
881
do {
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
619
do{
882
620
ret = gnutls_handshake(session);
883
if(quit_now){
884
errno = EINTR;
885
goto mandos_end;
886
}
887
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
888
622
889
623
if(ret != GNUTLS_E_SUCCESS){
890
624
if(debug){
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
892
626
gnutls_perror(ret);
893
627
}
894
errno = EPROTO;
628
retval = -1;
895
629
goto mandos_end;
896
630
}
897
631
898
632
/* Read OpenPGP packet that contains the wanted password */
899
633
900
634
if(debug){
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
902
" %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
903
637
}
904
638
905
639
while(true){
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
912
buffer_capacity = incbuffer(&buffer, buffer_length,
913
buffer_capacity);
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
914
642
if(buffer_capacity == 0){
915
int e = errno;
916
perror_plus("incbuffer");
917
errno = e;
918
goto mandos_end;
919
}
920
921
if(quit_now){
922
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
923
645
goto mandos_end;
924
646
}
925
647
934
656
case GNUTLS_E_AGAIN:
935
657
break;
936
658
case GNUTLS_E_REHANDSHAKE:
937
do {
659
do{
938
660
ret = gnutls_handshake(session);
939
940
if(quit_now){
941
errno = EINTR;
942
goto mandos_end;
943
}
944
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
945
662
if(ret < 0){
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
947
"***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
948
664
gnutls_perror(ret);
949
errno = EPROTO;
665
retval = -1;
950
666
goto mandos_end;
951
667
}
952
668
break;
953
669
default:
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
956
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
957
errno = EIO;
958
674
goto mandos_end;
959
675
}
960
676
} else {
963
679
}
964
680
965
681
if(debug){
966
fprintf_plus(stderr, "Closing TLS session\n");
967
}
968
969
if(quit_now){
970
errno = EINTR;
971
goto mandos_end;
972
}
973
974
do {
975
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
976
if(quit_now){
977
errno = EINTR;
978
goto mandos_end;
979
}
980
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
981
686
982
687
if(buffer_length > 0){
983
ssize_t decrypted_buffer_size;
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
690
&decrypted_buffer);
986
691
if(decrypted_buffer_size >= 0){
987
988
692
written = 0;
989
693
while(written < (size_t) decrypted_buffer_size){
990
if(quit_now){
991
errno = EINTR;
992
goto mandos_end;
993
}
994
995
694
ret = (int)fwrite(decrypted_buffer + written, 1,
996
695
(size_t)decrypted_buffer_size - written,
997
696
stdout);
998
697
if(ret == 0 and ferror(stdout)){
999
int e = errno;
1000
698
if(debug){
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1002
strerror(errno));
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
1003
701
}
1004
errno = e;
1005
goto mandos_end;
702
retval = -1;
703
break;
1006
704
}
1007
705
written += (size_t)ret;
1008
706
}
1009
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
1010
710
}
711
} else {
712
retval = -1;
1011
713
}
1012
714
1013
715
/* Shutdown procedure */
1014
716
1015
717
mandos_end:
1016
{
1017
int e = errno;
1018
free(decrypted_buffer);
1019
free(buffer);
1020
if(tcp_sd >= 0){
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1022
}
1023
if(ret == -1){
1024
if(e == 0){
1025
e = errno;
1026
}
1027
perror_plus("close");
1028
}
1029
gnutls_deinit(session);
1030
errno = e;
1031
if(quit_now){
1032
errno = EINTR;
1033
retval = -1;
1034
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
1035
722
}
723
gnutls_deinit(session);
1036
724
return retval;
1037
725
}
1038
726
1039
727
static void resolve_callback(AvahiSServiceResolver *r,
1040
728
AvahiIfIndex interface,
1041
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1042
730
AvahiResolverEvent event,
1043
731
const char *name,
1044
732
const char *type,
1049
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
1050
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1051
739
flags,
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
740
void* userdata){
741
mandos_context *mc = userdata;
742
assert(r);
1056
743
1057
744
/* Called whenever a service has been resolved successfully or
1058
745
timed out */
1059
746
1060
if(quit_now){
1061
return;
1062
}
1063
1064
747
switch(event){
1065
748
default:
1066
749
case AVAHI_RESOLVER_FAILURE:
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1072
753
break;
1073
754
1074
755
case AVAHI_RESOLVER_FOUND:
1076
757
char ip[AVAHI_ADDRESS_STR_MAX];
1077
758
avahi_address_snprint(ip, sizeof(ip), address);
1078
759
if(debug){
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1082
763
}
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
764
int ret = start_mandos_communication(ip, port, interface, mc);
1087
765
if(ret == 0){
1088
avahi_simple_poll_quit(simple_poll);
1089
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
766
avahi_simple_poll_quit(mc->simple_poll);
1096
767
}
1097
768
}
1098
769
}
1108
779
const char *domain,
1109
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1110
781
flags,
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
782
void* userdata){
783
mandos_context *mc = userdata;
784
assert(b);
1115
785
1116
786
/* Called whenever a new services becomes available on the LAN or
1117
787
is removed from the LAN */
1118
788
1119
if(quit_now){
1120
return;
1121
}
1122
1123
789
switch(event){
1124
790
default:
1125
791
case AVAHI_BROWSER_FAILURE:
1126
792
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1131
796
return;
1132
797
1133
798
case AVAHI_BROWSER_NEW:
1136
801
the callback function is called the Avahi server will free the
1137
802
resolver for us. */
1138
803
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1147
810
break;
1148
811
1149
812
case AVAHI_BROWSER_REMOVE:
1152
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1153
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1154
817
if(debug){
1155
fprintf_plus(stderr, "No Mandos server found, still"
1156
" searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1157
819
}
1158
820
break;
1159
821
}
1160
822
}
1161
823
1162
/* Signal handler that stops main loop after SIGTERM */
1163
static void handle_sigterm(int sig){
1164
if(quit_now){
1165
return;
1166
}
1167
quit_now = 1;
1168
signal_received = sig;
1169
int old_errno = errno;
1170
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1173
}
1174
errno = old_errno;
1175
}
1176
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
int ret;
1179
error_t ret_errno;
1180
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
if(s < 0){
1183
ret_errno = errno;
1184
perror_plus("socket");
1185
errno = ret_errno;
1186
return false;
1187
}
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
if(ret == -1){
1191
if(debug){
1192
ret_errno = errno;
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
}
1196
return false;
1197
}
1198
return true;
1199
}
1200
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1202
1203
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1207
ifname);
1208
}
1209
return false;
1210
}
1211
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1213
if(debug){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1216
}
1217
return true;
1218
}
1219
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return false;
1226
}
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1231
ifname);
1232
}
1233
return false;
1234
}
1235
1236
/* Accept this device */
1237
if(debug){
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1239
}
1240
return true;
1241
}
1242
1243
/*
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1247
*/
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1250
return 0;
1251
}
1252
1253
struct ifreq ifr;
1254
if(not get_flags(if_entry->d_name, &ifr)){
1255
if(debug){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1258
}
1259
return 0;
1260
}
1261
1262
if(not good_flags(if_entry->d_name, &ifr)){
1263
return 0;
1264
}
1265
return 1;
1266
}
1267
1268
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1298
}
1299
1300
int notdotentries(const struct dirent *direntry){
1301
/* Skip "." and ".." */
1302
if(direntry->d_name[0] == '.'
1303
and (direntry->d_name[1] == '\0'
1304
or (direntry->d_name[1] == '.'
1305
and direntry->d_name[2] == '\0'))){
1306
return 0;
1307
}
1308
return 1;
1309
}
1310
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1313
int ret;
1314
size_t sret;
1315
struct stat st;
1316
1317
if((direntry->d_name)[0] == '\0'){
1318
/* Empty name? */
1319
return 0;
1320
}
1321
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1324
"0123456789"
1325
"_-");
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1328
if(debug){
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1330
direntry->d_name);
1331
}
1332
return 0;
1333
}
1334
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1343
if(ret == -1){
1344
if(debug){
1345
perror_plus("Could not stat hook");
1346
}
1347
return 0;
1348
}
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1351
if(debug){
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
direntry->d_name);
1354
}
1355
return 0;
1356
}
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1369
return 1;
1370
}
1371
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1374
int ret;
1375
struct timespec now;
1376
struct timespec waited_time;
1377
intmax_t block_time;
1378
1379
while(true){
1380
if(mc->current_server == NULL){
1381
if (debug){
1382
fprintf_plus(stderr, "Wait until first server is found."
1383
" No timeout!\n");
1384
}
1385
ret = avahi_simple_poll_iterate(s, -1);
1386
} else {
1387
if (debug){
1388
fprintf_plus(stderr, "Check current_server if we should run"
1389
" it, or wait\n");
1390
}
1391
/* the current time */
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1393
if(ret == -1){
1394
perror_plus("clock_gettime");
1395
return -1;
1396
}
1397
/* Calculating in ms how long time between now and server
1398
who we visted longest time ago. Now - last seen. */
1399
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1401
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1403
/* total time is 10s/10,000ms.
1404
Converting to s from ms by dividing by 1,000,
1405
and ns to ms by dividing by 1,000,000. */
1406
block_time = ((retry_interval
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1409
1410
if (debug){
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1412
block_time);
1413
}
1414
1415
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1420
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1422
return 0;
1423
}
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1426
if(ret == -1){
1427
perror_plus("clock_gettime");
1428
return -1;
1429
}
1430
mc->current_server = mc->current_server->next;
1431
block_time = 0; /* Call avahi to find new Mandos
1432
servers, but don't block */
1433
}
1434
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1436
}
1437
if(ret != 0){
1438
if (ret > 0 or errno != EINTR){
1439
return (ret != 1) ? ret : 0;
1440
}
1441
}
1442
}
1443
}
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1498
const float delay){
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1502
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1520
perror_plus("asprintf");
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1579
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1591
} else {
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
1628
}
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1798
}
1799
1800
824
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
825
AvahiSServiceBrowser *sb = NULL;
1806
error_t ret_errno;
826
int error;
1807
827
int ret;
1808
828
intmax_t tmpmax;
1809
char *tmp;
829
int numchars;
1810
830
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
831
const char *interface = "eth0";
832
struct ifreq network;
833
int sd;
834
uid_t uid;
835
gid_t gid;
836
char *connect_to = NULL;
1813
837
char tempdir[] = "/tmp/mandosXXXXXX";
1814
838
bool tempdir_created = false;
1815
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
840
const char *seckey = PATHDIR "/" SECKEY;
1817
841
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1819
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1820
846
bool gnutls_initialized = false;
1821
847
bool gpgme_initialized = false;
1822
float delay = 2.5f;
1823
double retry_interval = 10; /* 10s between trying a server and
1824
retrying the same server again */
1825
1826
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1827
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1828
1829
uid = getuid();
1830
gid = getgid();
1831
1832
/* Lower any group privileges we might have, just to be safe */
1833
errno = 0;
1834
ret = setgid(gid);
1835
if(ret == -1){
1836
perror_plus("setgid");
1837
}
1838
1839
/* Lower user privileges (temporarily) */
1840
errno = 0;
1841
ret = seteuid(uid);
1842
if(ret == -1){
1843
perror_plus("seteuid");
1844
}
1845
1846
if(quit_now){
1847
goto end;
1848
}
848
double delay = 2.5;
1849
849
1850
850
{
1851
851
struct argp_option options[] = {
1857
857
.group = 1 },
1858
858
{ .name = "interface", .key = 'i',
1859
859
.arg = "NAME",
1860
.doc = "Network interface that will be used to search for"
1861
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1862
862
.group = 1 },
1863
863
{ .name = "seckey", .key = 's',
1864
864
.arg = "FILE",
1881
881
.arg = "SECONDS",
1882
882
.doc = "Maximum delay to wait for interface startup",
1883
883
.group = 2 },
1884
{ .name = "retry", .key = 132,
1885
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1887
.group = 2 },
1888
{ .name = "network-hook-dir", .key = 133,
1889
.arg = "DIR",
1890
.doc = "Directory where network hooks are located",
1891
.group = 2 },
1892
/*
1893
* These reproduce what we would get without ARGP_NO_HELP
1894
*/
1895
{ .name = "help", .key = '?',
1896
.doc = "Give this help list", .group = -1 },
1897
{ .name = "usage", .key = -3,
1898
.doc = "Give a short usage message", .group = -1 },
1899
{ .name = "version", .key = 'V',
1900
.doc = "Print program version", .group = -1 },
1901
884
{ .name = NULL }
1902
885
};
1903
886
1904
887
error_t parse_opt(int key, char *arg,
1905
888
struct argp_state *state){
1906
errno = 0;
1907
889
switch(key){
1908
890
case 128: /* --debug */
1909
891
debug = true;
1912
894
connect_to = arg;
1913
895
break;
1914
896
case 'i': /* --interface */
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
897
interface = arg;
1920
898
break;
1921
899
case 's': /* --seckey */
1922
900
seckey = arg;
1925
903
pubkey = arg;
1926
904
break;
1927
905
case 129: /* --dh-bits */
1928
errno = 0;
1929
tmpmax = strtoimax(arg, &tmp, 10);
1930
if(errno != 0 or tmp == arg or *tmp != '\0'
1931
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1932
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1933
911
}
1934
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1935
913
break;
1937
915
mc.priority = arg;
1938
916
break;
1939
917
case 131: /* --delay */
1940
errno = 0;
1941
delay = strtof(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'){
1943
argp_error(state, "Bad delay");
1944
}
1945
case 132: /* --retry */
1946
errno = 0;
1947
retry_interval = strtod(arg, &tmp);
1948
if(errno != 0 or tmp == arg or *tmp != '\0'
1949
or (retry_interval * 1000) > INT_MAX
1950
or retry_interval < 0){
1951
argp_error(state, "Bad retry interval");
1952
}
1953
break;
1954
case 133: /* --network-hook-dir */
1955
hookdir = arg;
1956
break;
1957
/*
1958
* These reproduce what we would get without ARGP_NO_HELP
1959
*/
1960
case '?': /* --help */
1961
argp_state_help(state, state->out_stream,
1962
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1963
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1964
case -3: /* --usage */
1965
argp_state_help(state, state->out_stream,
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
case 'V': /* --version */
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1970
927
break;
1971
928
default:
1972
929
return ARGP_ERR_UNKNOWN;
1973
930
}
1974
return errno;
931
return 0;
1975
932
}
1976
933
1977
934
struct argp argp = { .options = options, .parser = parse_opt,
1978
935
.args_doc = "",
1979
936
.doc = "Mandos client -- Get and decrypt"
1980
937
" passwords from a Mandos server" };
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
switch(ret){
1984
case 0:
1985
break;
1986
case ENOMEM:
1987
default:
1988
errno = ret;
1989
perror_plus("argp_parse");
1990
exitcode = EX_OSERR;
1991
goto end;
1992
case EINVAL:
1993
exitcode = EX_USAGE;
1994
goto end;
1995
}
1996
}
1997
1998
{
1999
/* Work around Debian bug #633582:
2000
<http://bugs.debian.org/633582> */
2001
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
2066
}
2067
}
2068
}
2069
2070
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
946
/* If the interface is down, bring it up */
947
{
948
#ifdef __linux__
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
951
ret = klogctl(8, NULL, 5);
952
if(ret == -1){
953
perror("klogctl");
954
}
955
#endif
956
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
961
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
963
if(ret == -1){
964
perror("klogctl");
965
}
966
#endif
967
goto end;
968
}
969
strcpy(network.ifr_name, interface);
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
973
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
if((network.ifr_flags & IFF_UP) == 0){
983
network.ifr_flags |= IFF_UP;
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
988
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
990
if(ret == -1){
991
perror("klogctl");
992
}
993
#endif
2076
994
goto end;
2077
995
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2085
}
2086
2087
if(not debug){
2088
avahi_set_log_function(empty_log);
2089
}
2090
2091
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
from the signal handler */
2093
/* Initialize the pseudo-RNG for Avahi */
2094
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
2099
exitcode = EX_UNAVAILABLE;
2100
goto end;
2101
}
2102
2103
sigemptyset(&sigterm_action.sa_mask);
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2105
if(ret == -1){
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
2108
goto end;
2109
}
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2111
if(ret == -1){
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
2114
goto end;
2115
}
2116
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2117
if(ret == -1){
2118
perror_plus("sigaddset");
2119
exitcode = EX_OSERR;
2120
goto end;
2121
}
2122
/* Need to check if the handler is SIG_IGN before handling:
2123
| [[info:libc:Initial Signal Actions]] |
2124
| [[info:libc:Basic Signal Handling]] |
2125
*/
2126
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2127
if(ret == -1){
2128
perror_plus("sigaction");
2129
return EX_OSERR;
2130
}
2131
if(old_sigterm_action.sa_handler != SIG_IGN){
2132
ret = sigaction(SIGINT, &sigterm_action, NULL);
2133
if(ret == -1){
2134
perror_plus("sigaction");
2135
exitcode = EX_OSERR;
2136
goto end;
2137
}
2138
}
2139
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2140
if(ret == -1){
2141
perror_plus("sigaction");
2142
return EX_OSERR;
2143
}
2144
if(old_sigterm_action.sa_handler != SIG_IGN){
2145
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2146
if(ret == -1){
2147
perror_plus("sigaction");
2148
exitcode = EX_OSERR;
2149
goto end;
2150
}
2151
}
2152
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2153
if(ret == -1){
2154
perror_plus("sigaction");
2155
return EX_OSERR;
2156
}
2157
if(old_sigterm_action.sa_handler != SIG_IGN){
2158
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2159
if(ret == -1){
2160
perror_plus("sigaction");
2161
exitcode = EX_OSERR;
2162
goto end;
2163
}
2164
}
2165
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
2213
}
2214
}
996
}
997
/* sleep checking until interface is running */
998
for(int i=0; i < delay * 4; i++){
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
1002
} else if(network.ifr_flags & IFF_RUNNING){
2215
1003
break;
2216
1004
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
ret = nanosleep(&sleeptime, NULL);
1007
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
2232
1009
}
2233
1010
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2246
}
2247
2248
if(quit_now){
2249
goto end;
2250
}
2251
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2253
if(ret == -1){
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
exitcode = EX_UNAVAILABLE;
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1014
}
1015
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2256
1041
goto end;
2257
1042
} else {
2258
1043
gnutls_initialized = true;
2259
1044
}
2260
1045
2261
if(quit_now){
2262
goto end;
2263
}
2264
2265
1046
if(mkdtemp(tempdir) == NULL){
2266
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2267
1048
goto end;
2268
1049
}
2269
1050
tempdir_created = true;
2270
1051
2271
if(quit_now){
2272
goto end;
2273
}
2274
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2277
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2278
1055
goto end;
2279
1056
} else {
2280
1057
gpgme_initialized = true;
2281
1058
}
2282
1059
2283
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2284
1064
goto end;
2285
1065
}
2286
1066
2288
1068
/* Connect directly, do not use Zeroconf */
2289
1069
/* (Mainly meant for debugging) */
2290
1070
char *address = strrchr(connect_to, ':');
2291
2292
1071
if(address == NULL){
2293
fprintf_plus(stderr, "No colon in address\n");
2294
exitcode = EX_USAGE;
2295
goto end;
2296
}
2297
2298
if(quit_now){
2299
goto end;
2300
}
2301
2302
in_port_t port;
2303
errno = 0;
2304
tmpmax = strtoimax(address+1, &tmp, 10);
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
2308
exitcode = EX_USAGE;
2309
goto end;
2310
}
2311
2312
if(quit_now){
2313
goto end;
2314
}
2315
2316
port = (in_port_t)tmpmax;
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1076
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1084
port = (uint16_t)tmpmax;
2317
1085
*address = '\0';
2318
/* Colon in address indicates IPv6 */
2319
int af;
2320
if(strchr(connect_to, ':') != NULL){
2321
af = AF_INET6;
2322
/* Accept [] around IPv6 address - see RFC 5952 */
2323
if(connect_to[0] == '[' and address[-1] == ']')
2324
{
2325
connect_to++;
2326
address[-1] = '\0';
2327
}
2328
} else {
2329
af = AF_INET;
2330
}
2331
1086
address = connect_to;
2332
2333
if(quit_now){
2334
goto end;
2335
}
2336
2337
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2340
if(quit_now or ret == 0){
2341
break;
2342
}
2343
if(debug){
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2346
}
2347
sleep((unsigned int)retry_interval);
2348
}
2349
2350
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2351
1091
exitcode = EXIT_SUCCESS;
2352
1092
}
2353
2354
1093
goto end;
2355
1094
}
2356
1095
2357
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2358
1108
goto end;
2359
1109
}
2360
1110
2368
1118
config.publish_domain = 0;
2369
1119
2370
1120
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
1121
mc.server = avahi_server_new(avahi_simple_poll_get
1122
(mc.simple_poll), &config, NULL,
1123
NULL, &error);
2373
1124
2374
1125
/* Free the Avahi configuration data */
2375
1126
avahi_server_config_free(&config);
2377
1128
2378
1129
/* Check if creating the Avahi server object succeeded */
2379
1130
if(mc.server == NULL){
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2382
exitcode = EX_UNAVAILABLE;
2383
goto end;
2384
}
2385
2386
if(quit_now){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2387
1134
goto end;
2388
1135
}
2389
1136
2390
1137
/* Create the Avahi service browser */
2391
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2395
1141
if(sb == NULL){
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
2398
exitcode = EX_UNAVAILABLE;
2399
goto end;
2400
}
2401
2402
if(quit_now){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2403
1145
goto end;
2404
1146
}
2405
1147
2406
1148
/* Run the main loop */
2407
1149
2408
1150
if(debug){
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
}
2411
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2414
if(debug){
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
2417
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2418
1155
2419
1156
end:
2420
1157
2421
1158
if(debug){
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2423
1160
}
2424
1161
2425
1162
/* Cleanup things */
2426
free(mc.interfaces);
2427
2428
1163
if(sb != NULL)
2429
1164
avahi_s_service_browser_free(sb);
2430
1165
2431
1166
if(mc.server != NULL)
2432
1167
avahi_server_free(mc.server);
2433
1168
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
1169
if(mc.simple_poll != NULL)
1170
avahi_simple_poll_free(mc.simple_poll);
2436
1171
2437
1172
if(gnutls_initialized){
2438
1173
gnutls_certificate_free_credentials(mc.cred);
2444
1179
gpgme_release(mc.ctx);
2445
1180
}
2446
1181
2447
/* Cleans up the circular linked list of Mandos servers the client
2448
has seen */
2449
if(mc.current_server != NULL){
2450
mc.current_server->prev->next = NULL;
2451
while(mc.current_server != NULL){
2452
server *next = mc.current_server->next;
2453
free(mc.current_server);
2454
mc.current_server = next;
2455
}
2456
}
2457
2458
/* Re-raise priviliges */
2459
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2476
}
2477
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2481
}
2482
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2489
2490
/* Removes the GPGME temp directory and all files inside */
1182
/* Removes the temp directory used by GPGME */
2491
1183
if(tempdir_created){
2492
struct dirent **direntries = NULL;
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2499
1204
char *fullname = NULL;
2500
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
1206
direntry->d_name);
2502
1207
if(ret < 0){
2503
perror_plus("asprintf");
1208
perror("asprintf");
2504
1209
continue;
2505
1210
}
2506
1211
ret = remove(fullname);
2507
1212
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2510
1215
}
2511
1216
free(fullname);
2512
1217
}
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
1218
closedir(d);
2519
1219
}
2520
1220
ret = rmdir(tempdir);
2521
1221
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
2523
}
2524
}
2525
2526
if(quit_now){
2527
sigemptyset(&old_sigterm_action.sa_mask);
2528
old_sigterm_action.sa_handler = SIG_DFL;
2529
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2530
&old_sigterm_action,
2531
NULL));
2532
if(ret == -1){
2533
perror_plus("sigaction");
2534
}
2535
do {
2536
ret = raise(signal_received);
2537
} while(ret != 0 and errno == EINTR);
2538
if(ret != 0){
2539
perror_plus("raise");
2540
abort();
2541
}
2542
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2543
1224
}
2544
1225
2545
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0