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- Committer: Teddy Hogeborn
- Date: 2014-03-06 02:26:04 UTC
- Revision ID: teddy@recompile.se-20140306022604-4uc43taz25cflgi3
Bug fix: Free all memory and give better messages when memory is full.
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
80
80
argp_parse(), ARGP_KEY_ARG,
81
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
85
94
86
95
#ifdef __linux__
87
96
#include <sys/klog.h> /* klogctl() */
105
114
init_gnutls_session(),
106
115
GNUTLS_* */
107
116
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
119
111
120
/* GPGME */
112
121
#include <gpgme.h> /* All GPGME types, constants and
120
129
#define PATHDIR "/conf/conf.d/mandos"
121
130
#define SECKEY "seckey.txt"
122
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
133
124
134
bool debug = false;
125
135
static const char mandos_protocol_version[] = "1";
126
136
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
128
154
129
155
/* Used for passing in values through the Avahi callback functions */
130
156
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
157
AvahiServer *server;
133
158
gnutls_certificate_credentials_t cred;
134
159
unsigned int dh_bits;
135
160
gnutls_dh_params_t dh_params;
136
161
const char *priority;
137
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
138
166
} mandos_context;
139
167
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
170
171
sig_atomic_t quit_now = 0;
172
int signal_received = 0;
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
144
192
145
193
/*
146
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
148
196
* "buffer_length" is how much is already used.
149
197
*/
150
198
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
199
size_t buffer_capacity){
152
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
155
207
return 0;
156
208
}
209
*buffer = new_buf;
157
210
buffer_capacity += BUFFER_SIZE;
158
211
}
159
212
return buffer_capacity;
160
213
}
161
214
215
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
218
int ret;
219
server *new_server = malloc(sizeof(server));
220
if(new_server == NULL){
221
perror_plus("malloc");
222
return false;
223
}
224
*new_server = (server){ .ip = strdup(ip),
225
.port = port,
226
.if_index = if_index,
227
.af = af };
228
if(new_server->ip == NULL){
229
perror_plus("strdup");
230
return false;
231
}
232
/* Special case of first server */
233
if(*current_server == NULL){
234
new_server->next = new_server;
235
new_server->prev = new_server;
236
*current_server = new_server;
237
/* Place the new server last in the list */
238
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
241
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
return false;
248
}
249
return true;
250
}
251
162
252
/*
163
253
* Initialize GPGME.
164
254
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
168
257
gpgme_error_t rc;
169
258
gpgme_engine_info_t engine_info;
170
259
171
172
260
/*
173
261
* Helper function to insert pub and seckey to the engine keyring.
174
262
*/
175
263
bool import_key(const char *filename){
264
int ret;
176
265
int fd;
177
266
gpgme_data_t pgp_data;
178
267
179
268
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
269
if(fd == -1){
181
perror("open");
270
perror_plus("open");
182
271
return false;
183
272
}
184
273
185
274
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
275
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
189
278
return false;
190
279
}
191
280
192
rc = gpgme_op_import(mc.ctx, pgp_data);
281
rc = gpgme_op_import(mc->ctx, pgp_data);
193
282
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
196
285
return false;
197
286
}
198
287
199
288
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
289
if(ret == -1){
201
perror("close");
290
perror_plus("close");
202
291
}
203
292
gpgme_data_release(pgp_data);
204
293
return true;
205
294
}
206
295
207
296
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
297
fprintf_plus(stderr, "Initializing GPGME\n");
209
298
}
210
299
211
300
/* Init GPGME */
212
301
gpgme_check_version(NULL);
213
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
303
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
217
306
return false;
218
307
}
219
308
220
/* Set GPGME home directory for the OpenPGP engine only */
309
/* Set GPGME home directory for the OpenPGP engine only */
221
310
rc = gpgme_get_engine_info(&engine_info);
222
311
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
225
314
return false;
226
315
}
227
316
while(engine_info != NULL){
233
322
engine_info = engine_info->next;
234
323
}
235
324
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
325
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
326
tempdir);
237
327
return false;
238
328
}
239
329
240
330
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
331
rc = gpgme_new(&(mc->ctx));
242
332
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
245
336
return false;
246
337
}
247
338
249
340
return false;
250
341
}
251
342
252
return true;
343
return true;
253
344
}
254
345
255
346
/*
258
349
*/
259
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
351
size_t crypto_size,
261
char **plaintext){
352
char **plaintext,
353
mandos_context *mc){
262
354
gpgme_data_t dh_crypto, dh_plain;
263
355
gpgme_error_t rc;
264
356
ssize_t ret;
266
358
ssize_t plaintext_length = 0;
267
359
268
360
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
362
}
271
363
272
364
/* Create new GPGME data buffer from memory cryptotext */
273
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
366
0);
275
367
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
278
370
return -1;
279
371
}
280
372
281
373
/* Create new empty GPGME data buffer for the plaintext */
282
374
rc = gpgme_data_new(&dh_plain);
283
375
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
286
379
gpgme_data_release(dh_crypto);
287
380
return -1;
288
381
}
289
382
290
383
/* Decrypt data from the cryptotext data buffer to the plaintext
291
384
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
386
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
296
389
plaintext_length = -1;
297
390
if(debug){
298
391
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
300
393
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
395
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
307
400
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
402
}
310
403
gpgme_recipient_t recipient;
311
404
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
405
while(recipient != NULL){
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
412
? "No" : "Yes");
413
recipient = recipient->next;
322
414
}
323
415
}
324
416
}
326
418
}
327
419
328
420
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
422
}
331
423
332
424
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
425
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
426
perror_plus("gpgme_data_seek");
335
427
plaintext_length = -1;
336
428
goto decrypt_end;
337
429
}
339
431
*plaintext = NULL;
340
432
while(true){
341
433
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
434
(size_t)plaintext_length,
435
plaintext_capacity);
344
436
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
437
perror_plus("incbuffer");
438
plaintext_length = -1;
439
goto decrypt_end;
348
440
}
349
441
350
442
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
447
break;
356
448
}
357
449
if(ret < 0){
358
perror("gpgme_data_read");
450
perror_plus("gpgme_data_read");
359
451
plaintext_length = -1;
360
452
goto decrypt_end;
361
453
}
363
455
}
364
456
365
457
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
458
fprintf_plus(stderr, "Decrypted password is: ");
367
459
for(ssize_t i = 0; i < plaintext_length; i++){
368
460
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
461
}
381
473
}
382
474
383
475
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
476
const char *ret = gnutls_strerror(value);
386
477
if(ret == NULL)
387
478
ret = "(unknown)";
388
479
return ret;
391
482
/* GnuTLS log function callback */
392
483
static void debuggnutls(__attribute__((unused)) int level,
393
484
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
485
fprintf_plus(stderr, "GnuTLS: %s", string);
395
486
}
396
487
397
488
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
489
const char *seckeyfilename,
490
mandos_context *mc){
399
491
int ret;
400
492
401
493
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
495
}
404
496
405
497
ret = gnutls_global_init();
406
498
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
409
501
return -1;
410
502
}
411
503
418
510
}
419
511
420
512
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
514
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
428
517
gnutls_global_deinit();
429
518
return -1;
430
519
}
431
520
432
521
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
pubkeyfilename,
525
seckeyfilename);
436
526
}
437
527
438
528
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
440
530
GNUTLS_OPENPGP_FMT_BASE64);
441
531
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
532
fprintf_plus(stderr,
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
447
537
goto globalfail;
448
538
}
449
539
450
540
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
452
542
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
455
546
goto globalfail;
456
547
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
549
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
461
552
goto globalfail;
462
553
}
463
554
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
556
466
557
return 0;
467
558
468
559
globalfail:
469
560
470
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
471
562
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
473
564
return -1;
474
565
}
475
566
476
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
477
569
int ret;
478
570
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
571
do {
572
ret = gnutls_init(session, GNUTLS_SERVER);
573
if(quit_now){
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
577
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
483
581
}
484
582
485
583
{
486
584
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
587
if(quit_now){
588
gnutls_deinit(*session);
589
return -1;
590
}
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
592
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
593
fprintf_plus(stderr, "Syntax error at: %s\n", err);
594
fprintf_plus(stderr, "GnuTLS error: %s\n",
595
safer_gnutls_strerror(ret));
492
596
gnutls_deinit(*session);
493
597
return -1;
494
598
}
495
599
}
496
600
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
601
do {
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
604
if(quit_now){
605
gnutls_deinit(*session);
606
return -1;
607
}
608
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
609
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
502
612
gnutls_deinit(*session);
503
613
return -1;
504
614
}
505
615
506
616
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
618
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
511
620
512
621
return 0;
513
622
}
517
626
__attribute__((unused)) const char *txt){}
518
627
519
628
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
521
630
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
631
int af, mandos_context *mc){
632
int ret, tcp_sd = -1;
524
633
ssize_t sret;
525
634
union {
526
635
struct sockaddr_in in;
527
636
struct sockaddr_in6 in6;
528
637
} to;
529
638
char *buffer = NULL;
530
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
531
640
size_t buffer_length = 0;
532
641
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
642
size_t written;
535
int retval = 0;
643
int retval = -1;
536
644
gnutls_session_t session;
537
645
int pf; /* Protocol family */
538
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
539
654
switch(af){
540
655
case AF_INET6:
541
656
pf = PF_INET6;
544
659
pf = PF_INET;
545
660
break;
546
661
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
errno = EINVAL;
548
664
return -1;
549
665
}
550
666
551
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
552
700
if(ret != 0){
553
701
return -1;
554
702
}
555
703
556
704
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
559
707
}
560
708
561
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
710
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
711
int e = errno;
712
perror_plus("socket");
713
errno = e;
714
goto mandos_end;
715
}
716
717
if(quit_now){
718
errno = EINTR;
719
goto mandos_end;
565
720
}
566
721
567
722
memset(&to, 0, sizeof(to));
568
723
if(af == AF_INET6){
569
to.in6.sin6_family = (uint16_t)af;
724
to.in6.sin6_family = (sa_family_t)af;
570
725
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
726
} else { /* IPv4 */
572
727
to.in.sin_family = (sa_family_t)af;
573
728
ret = inet_pton(af, ip, &to.in.sin_addr);
574
729
}
575
730
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
731
int e = errno;
732
perror_plus("inet_pton");
733
errno = e;
734
goto mandos_end;
578
735
}
579
736
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
737
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
739
errno = e;
740
goto mandos_end;
582
741
}
583
742
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
588
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
591
753
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
756
errno = EINVAL;
757
goto mandos_end;
595
758
}
596
759
/* Set the network interface number as scope */
597
760
to.in6.sin6_scope_id = (uint32_t)if_index;
598
761
}
599
762
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
763
to.in.sin_port = htons(port);
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
603
769
}
604
770
605
771
if(debug){
606
772
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
773
char interface[IF_NAMESIZE];
608
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
775
perror_plus("if_indextoname");
610
776
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
613
779
}
614
780
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
617
783
}
618
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
626
792
sizeof(addrstr));
627
793
}
628
794
if(pcret == NULL){
629
perror("inet_ntop");
795
perror_plus("inet_ntop");
630
796
} else {
631
797
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
633
799
}
634
800
}
635
801
}
636
802
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
637
808
if(af == AF_INET6){
638
809
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
810
} else {
640
811
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
812
}
642
813
if(ret < 0){
643
perror("connect");
644
return -1;
814
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
815
int e = errno;
816
perror_plus("connect");
817
errno = e;
818
}
819
goto mandos_end;
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
645
825
}
646
826
647
827
const char *out = mandos_protocol_version;
649
829
while(true){
650
830
size_t out_size = strlen(out);
651
831
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
832
out_size - written));
653
833
if(ret == -1){
654
perror("write");
655
retval = -1;
834
int e = errno;
835
perror_plus("write");
836
errno = e;
656
837
goto mandos_end;
657
838
}
658
839
written += (size_t)ret;
666
847
break;
667
848
}
668
849
}
850
851
if(quit_now){
852
errno = EINTR;
853
goto mandos_end;
854
}
669
855
}
670
856
671
857
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
859
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
do {
678
878
ret = gnutls_handshake(session);
879
if(quit_now){
880
errno = EINTR;
881
goto mandos_end;
882
}
679
883
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
884
681
885
if(ret != GNUTLS_E_SUCCESS){
682
886
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
888
gnutls_perror(ret);
685
889
}
686
retval = -1;
890
errno = EPROTO;
687
891
goto mandos_end;
688
892
}
689
893
690
894
/* Read OpenPGP packet that contains the wanted password */
691
895
692
896
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
695
899
}
696
900
697
901
while(true){
902
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
698
908
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
909
buffer_capacity);
700
910
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
911
int e = errno;
912
perror_plus("incbuffer");
913
errno = e;
914
goto mandos_end;
915
}
916
917
if(quit_now){
918
errno = EINTR;
703
919
goto mandos_end;
704
920
}
705
921
714
930
case GNUTLS_E_AGAIN:
715
931
break;
716
932
case GNUTLS_E_REHANDSHAKE:
717
do{
933
do {
718
934
ret = gnutls_handshake(session);
935
936
if(quit_now){
937
errno = EINTR;
938
goto mandos_end;
939
}
719
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
941
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
722
944
gnutls_perror(ret);
723
retval = -1;
945
errno = EPROTO;
724
946
goto mandos_end;
725
947
}
726
948
break;
727
949
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
731
952
gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
errno = EIO;
732
954
goto mandos_end;
733
955
}
734
956
} else {
737
959
}
738
960
739
961
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
fprintf_plus(stderr, "Closing TLS session\n");
963
}
964
965
if(quit_now){
966
errno = EINTR;
967
goto mandos_end;
968
}
969
970
do {
971
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
972
if(quit_now){
973
errno = EINTR;
974
goto mandos_end;
975
}
976
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
977
745
978
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
979
ssize_t decrypted_buffer_size;
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
749
982
if(decrypted_buffer_size >= 0){
983
750
984
written = 0;
751
985
while(written < (size_t) decrypted_buffer_size){
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
752
991
ret = (int)fwrite(decrypted_buffer + written, 1,
753
992
(size_t)decrypted_buffer_size - written,
754
993
stdout);
755
994
if(ret == 0 and ferror(stdout)){
995
int e = errno;
756
996
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
759
999
}
760
retval = -1;
761
break;
1000
errno = e;
1001
goto mandos_end;
762
1002
}
763
1003
written += (size_t)ret;
764
1004
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1005
retval = 0;
768
1006
}
769
} else {
770
retval = -1;
771
1007
}
772
1008
773
1009
/* Shutdown procedure */
774
1010
775
1011
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1012
{
1013
int e = errno;
1014
free(decrypted_buffer);
1015
free(buffer);
1016
if(tcp_sd >= 0){
1017
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1018
}
1019
if(ret == -1){
1020
if(e == 0){
1021
e = errno;
1022
}
1023
perror_plus("close");
1024
}
1025
gnutls_deinit(session);
1026
errno = e;
1027
if(quit_now){
1028
errno = EINTR;
1029
retval = -1;
1030
}
780
1031
}
781
gnutls_deinit(session);
782
1032
return retval;
783
1033
}
784
1034
795
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1047
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
800
1052
801
1053
/* Called whenever a service has been resolved successfully or
802
1054
timed out */
803
1055
1056
if(quit_now){
1057
return;
1058
}
1059
804
1060
switch(event){
805
1061
default:
806
1062
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1063
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
810
1068
break;
811
1069
812
1070
case AVAHI_RESOLVER_FOUND:
814
1072
char ip[AVAHI_ADDRESS_STR_MAX];
815
1073
avahi_address_snprint(ip, sizeof(ip), address);
816
1074
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1075
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
host_name, ip, (intmax_t)interface, port);
820
1078
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
823
1083
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1085
} else {
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
825
1092
}
826
1093
}
827
1094
}
837
1104
const char *domain,
838
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1106
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
842
1111
843
1112
/* Called whenever a new services becomes available on the LAN or
844
1113
is removed from the LAN */
845
1114
1115
if(quit_now){
1116
return;
1117
}
1118
846
1119
switch(event){
847
1120
default:
848
1121
case AVAHI_BROWSER_FAILURE:
849
1122
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1123
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
853
1127
return;
854
1128
855
1129
case AVAHI_BROWSER_NEW:
858
1132
the callback function is called the Avahi server will free the
859
1133
resolver for us. */
860
1134
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1139
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
866
1143
break;
867
1144
868
1145
case AVAHI_BROWSER_REMOVE:
871
1148
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1149
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1150
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
875
1153
}
876
1154
break;
877
1155
}
878
1156
}
879
1157
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1158
/* Signal handler that stops main loop after SIGTERM */
1159
static void handle_sigterm(int sig){
884
1160
if(quit_now){
885
1161
return;
886
1162
}
887
1163
quit_now = 1;
1164
signal_received = sig;
888
1165
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
1166
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1169
}
1170
errno = old_errno;
1171
}
1172
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
int ret;
1175
error_t ret_errno;
1176
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
if(s < 0){
1179
ret_errno = errno;
1180
perror_plus("socket");
1181
errno = ret_errno;
1182
return false;
1183
}
1184
strcpy(ifr->ifr_name, ifname);
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
if(ret == -1){
1187
if(debug){
1188
ret_errno = errno;
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
}
1192
return false;
1193
}
1194
return true;
1195
}
1196
1197
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1199
/* Reject the loopback device */
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1201
if(debug){
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1203
ifname);
1204
}
1205
return false;
1206
}
1207
/* Accept point-to-point devices only if connect_to is specified */
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1209
if(debug){
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1212
}
1213
return true;
1214
}
1215
/* Otherwise, reject non-broadcast-capable devices */
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1220
}
1221
return false;
1222
}
1223
/* Reject non-ARP interfaces (including dummy interfaces) */
1224
if(ifr->ifr_flags & IFF_NOARP){
1225
if(debug){
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
ifname);
1228
}
1229
return false;
1230
}
1231
1232
/* Accept this device */
1233
if(debug){
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1235
}
1236
return true;
1237
}
1238
1239
/*
1240
* This function determines if a directory entry in /sys/class/net
1241
* corresponds to an acceptable network device.
1242
* (This function is passed to scandir(3) as a filter function.)
1243
*/
1244
int good_interface(const struct dirent *if_entry){
1245
if(if_entry->d_name[0] == '.'){
1246
return 0;
1247
}
1248
1249
struct ifreq ifr;
1250
if(not get_flags(if_entry->d_name, &ifr)){
1251
if(debug){
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1254
}
1255
return 0;
1256
}
1257
1258
if(not good_flags(if_entry->d_name, &ifr)){
1259
return 0;
1260
}
1261
return 1;
1262
}
1263
1264
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
}
1295
1296
int notdotentries(const struct dirent *direntry){
1297
/* Skip "." and ".." */
1298
if(direntry->d_name[0] == '.'
1299
and (direntry->d_name[1] == '\0'
1300
or (direntry->d_name[1] == '.'
1301
and direntry->d_name[2] == '\0'))){
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
1307
/* Is this directory entry a runnable program? */
1308
int runnable_hook(const struct dirent *direntry){
1309
int ret;
1310
size_t sret;
1311
struct stat st;
1312
1313
if((direntry->d_name)[0] == '\0'){
1314
/* Empty name? */
1315
return 0;
1316
}
1317
1318
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
"abcdefghijklmnopqrstuvwxyz"
1320
"0123456789"
1321
"_-");
1322
if((direntry->d_name)[sret] != '\0'){
1323
/* Contains non-allowed characters */
1324
if(debug){
1325
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1326
direntry->d_name);
1327
}
1328
return 0;
1329
}
1330
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1333
if(ret < 0){
1334
perror_plus("asprintf");
1335
return 0;
1336
}
1337
1338
ret = stat(fullname, &st);
1339
if(ret == -1){
1340
if(debug){
1341
perror_plus("Could not stat hook");
1342
}
1343
return 0;
1344
}
1345
if(not (S_ISREG(st.st_mode))){
1346
/* Not a regular file */
1347
if(debug){
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1349
direntry->d_name);
1350
}
1351
return 0;
1352
}
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1354
/* Not executable */
1355
if(debug){
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1357
direntry->d_name);
1358
}
1359
return 0;
1360
}
1361
if(debug){
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
direntry->d_name);
1364
}
1365
return 1;
1366
}
1367
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1370
int ret;
1371
struct timespec now;
1372
struct timespec waited_time;
1373
intmax_t block_time;
1374
1375
while(true){
1376
if(mc->current_server == NULL){
1377
if (debug){
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1380
}
1381
ret = avahi_simple_poll_iterate(s, -1);
1382
} else {
1383
if (debug){
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1386
}
1387
/* the current time */
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
/* Calculating in ms how long time between now and server
1394
who we visted longest time ago. Now - last seen. */
1395
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1397
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1399
/* total time is 10s/10,000ms.
1400
Converting to s from ms by dividing by 1,000,
1401
and ns to ms by dividing by 1,000,000. */
1402
block_time = ((retry_interval
1403
- ((intmax_t)waited_time.tv_sec * 1000))
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
1406
if (debug){
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1409
}
1410
1411
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
1416
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1418
return 0;
1419
}
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1422
if(ret == -1){
1423
perror_plus("clock_gettime");
1424
return -1;
1425
}
1426
mc->current_server = mc->current_server->next;
1427
block_time = 0; /* Call avahi to find new Mandos
1428
servers, but don't block */
1429
}
1430
1431
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
}
1433
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
1435
return (ret != 1) ? ret : 0;
1436
}
1437
}
1438
}
1439
}
1440
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
bool run_network_hooks(const char *mode, const char *interface,
1494
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
1498
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
1516
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
1575
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1587
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
1624
}
1625
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
893
1794
}
894
1795
895
1796
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
896
1801
AvahiSServiceBrowser *sb = NULL;
897
int error;
1802
error_t ret_errno;
898
1803
int ret;
899
1804
intmax_t tmpmax;
900
1805
char *tmp;
901
1806
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
908
1809
char tempdir[] = "/tmp/mandosXXXXXX";
909
1810
bool tempdir_created = false;
910
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
1812
const char *seckey = PATHDIR "/" SECKEY;
912
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
913
1815
914
1816
bool gnutls_initialized = false;
915
1817
bool gpgme_initialized = false;
916
1818
float delay = 2.5f;
1819
double retry_interval = 10; /* 10s between trying a server and
1820
retrying the same server again */
917
1821
918
struct sigaction old_sigterm_action;
1822
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1823
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
1824
1825
uid = getuid();
1826
gid = getgid();
1827
1828
/* Lower any group privileges we might have, just to be safe */
1829
errno = 0;
1830
ret = setgid(gid);
1831
if(ret == -1){
1832
perror_plus("setgid");
1833
}
1834
1835
/* Lower user privileges (temporarily) */
1836
errno = 0;
1837
ret = seteuid(uid);
1838
if(ret == -1){
1839
perror_plus("seteuid");
1840
}
1841
1842
if(quit_now){
1843
goto end;
1844
}
1845
921
1846
{
922
1847
struct argp_option options[] = {
923
1848
{ .name = "debug", .key = 128,
952
1877
.arg = "SECONDS",
953
1878
.doc = "Maximum delay to wait for interface startup",
954
1879
.group = 2 },
1880
{ .name = "retry", .key = 132,
1881
.arg = "SECONDS",
1882
.doc = "Retry interval used when denied by the Mandos server",
1883
.group = 2 },
1884
{ .name = "network-hook-dir", .key = 133,
1885
.arg = "DIR",
1886
.doc = "Directory where network hooks are located",
1887
.group = 2 },
1888
/*
1889
* These reproduce what we would get without ARGP_NO_HELP
1890
*/
1891
{ .name = "help", .key = '?',
1892
.doc = "Give this help list", .group = -1 },
1893
{ .name = "usage", .key = -3,
1894
.doc = "Give a short usage message", .group = -1 },
1895
{ .name = "version", .key = 'V',
1896
.doc = "Print program version", .group = -1 },
955
1897
{ .name = NULL }
956
1898
};
957
1899
958
1900
error_t parse_opt(int key, char *arg,
959
1901
struct argp_state *state){
1902
errno = 0;
960
1903
switch(key){
961
1904
case 128: /* --debug */
962
1905
debug = true;
965
1908
connect_to = arg;
966
1909
break;
967
1910
case 'i': /* --interface */
968
interface = arg;
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
969
1916
break;
970
1917
case 's': /* --seckey */
971
1918
seckey = arg;
978
1925
tmpmax = strtoimax(arg, &tmp, 10);
979
1926
if(errno != 0 or tmp == arg or *tmp != '\0'
980
1927
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1928
argp_error(state, "Bad number of DH bits");
983
1929
}
984
1930
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1931
break;
990
1936
errno = 0;
991
1937
delay = strtof(arg, &tmp);
992
1938
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1939
argp_error(state, "Bad delay");
1940
}
1941
case 132: /* --retry */
1942
errno = 0;
1943
retry_interval = strtod(arg, &tmp);
1944
if(errno != 0 or tmp == arg or *tmp != '\0'
1945
or (retry_interval * 1000) > INT_MAX
1946
or retry_interval < 0){
1947
argp_error(state, "Bad retry interval");
1948
}
1949
break;
1950
case 133: /* --network-hook-dir */
1951
hookdir = arg;
1952
break;
1953
/*
1954
* These reproduce what we would get without ARGP_NO_HELP
1955
*/
1956
case '?': /* --help */
1957
argp_state_help(state, state->out_stream,
1958
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1959
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1960
case -3: /* --usage */
1961
argp_state_help(state, state->out_stream,
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1963
case 'V': /* --version */
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1965
exit(argp_err_exit_status);
1000
1966
break;
1001
1967
default:
1002
1968
return ARGP_ERR_UNKNOWN;
1003
1969
}
1004
return 0;
1970
return errno;
1005
1971
}
1006
1972
1007
1973
struct argp argp = { .options = options, .parser = parse_opt,
1008
1974
.args_doc = "",
1009
1975
.doc = "Mandos client -- Get and decrypt"
1010
1976
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1977
ret = argp_parse(&argp, argc, argv,
1978
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1979
switch(ret){
1980
case 0:
1981
break;
1982
case ENOMEM:
1983
default:
1984
errno = ret;
1985
perror_plus("argp_parse");
1986
exitcode = EX_OSERR;
1987
goto end;
1988
case EINVAL:
1989
exitcode = EX_USAGE;
1990
goto end;
1991
}
1992
}
1993
1994
{
1995
/* Work around Debian bug #633582:
1996
<http://bugs.debian.org/633582> */
1997
1998
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2000
struct stat st;
2001
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2006
} else {
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2008
if(ret == -1){
2009
perror_plus("fstat");
2010
} else {
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2014
if(ret == -1){
2015
perror_plus("fchown");
2016
}
2017
}
2018
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2020
}
2021
}
2022
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2027
} else {
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2029
if(ret == -1){
2030
perror_plus("fstat");
2031
} else {
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2035
if(ret == -1){
2036
perror_plus("fchown");
2037
}
2038
}
2039
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2044
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
2062
}
2063
}
2064
}
2065
2066
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
1015
2079
goto end;
1016
2080
}
1017
2081
}
1024
2088
from the signal handler */
1025
2089
/* Initialize the pseudo-RNG for Avahi */
1026
2090
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
2095
exitcode = EX_UNAVAILABLE;
1031
2096
goto end;
1032
2097
}
1033
2098
1034
2099
sigemptyset(&sigterm_action.sa_mask);
1035
2100
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2101
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2102
perror_plus("sigaddset");
2103
exitcode = EX_OSERR;
1039
2104
goto end;
1040
2105
}
1041
2106
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2107
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2108
perror_plus("sigaddset");
2109
exitcode = EX_OSERR;
1045
2110
goto end;
1046
2111
}
1047
2112
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2113
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2114
perror_plus("sigaddset");
2115
exitcode = EX_OSERR;
2116
goto end;
2117
}
2118
/* Need to check if the handler is SIG_IGN before handling:
2119
| [[info:libc:Initial Signal Actions]] |
2120
| [[info:libc:Basic Signal Handling]] |
2121
*/
2122
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2123
if(ret == -1){
2124
perror_plus("sigaction");
2125
return EX_OSERR;
2126
}
2127
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
ret = sigaction(SIGINT, &sigterm_action, NULL);
2129
if(ret == -1){
2130
perror_plus("sigaction");
2131
exitcode = EX_OSERR;
2132
goto end;
2133
}
2134
}
2135
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2136
if(ret == -1){
2137
perror_plus("sigaction");
2138
return EX_OSERR;
2139
}
2140
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2142
if(ret == -1){
2143
perror_plus("sigaction");
2144
exitcode = EX_OSERR;
2145
goto end;
2146
}
2147
}
2148
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2149
if(ret == -1){
2150
perror_plus("sigaction");
2151
return EX_OSERR;
2152
}
2153
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2155
if(ret == -1){
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
2184
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
1113
2209
}
1114
2210
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
2211
break;
1126
2212
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2242
}
2243
2244
if(quit_now){
2245
goto end;
2246
}
2247
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2249
if(ret == -1){
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
exitcode = EX_UNAVAILABLE;
1166
2252
goto end;
1167
2253
} else {
1168
2254
gnutls_initialized = true;
1169
2255
}
1170
2256
2257
if(quit_now){
2258
goto end;
2259
}
2260
1171
2261
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
2262
perror_plus("mkdtemp");
1173
2263
goto end;
1174
2264
}
1175
2265
tempdir_created = true;
1176
2266
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2267
if(quit_now){
2268
goto end;
2269
}
2270
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
2273
exitcode = EX_UNAVAILABLE;
1180
2274
goto end;
1181
2275
} else {
1182
2276
gpgme_initialized = true;
1183
2277
}
1184
2278
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2279
if(quit_now){
2280
goto end;
1192
2281
}
1193
2282
1194
2283
if(connect_to != NULL){
1195
2284
/* Connect directly, do not use Zeroconf */
1196
2285
/* (Mainly meant for debugging) */
1197
2286
char *address = strrchr(connect_to, ':');
2287
1198
2288
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2289
fprintf_plus(stderr, "No colon in address\n");
2290
exitcode = EX_USAGE;
2291
goto end;
2292
}
2293
2294
if(quit_now){
2295
goto end;
2296
}
2297
2298
in_port_t port;
1204
2299
errno = 0;
1205
2300
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
2304
exitcode = EX_USAGE;
2305
goto end;
2306
}
2307
2308
if(quit_now){
2309
goto end;
2310
}
2311
2312
port = (in_port_t)tmpmax;
1213
2313
*address = '\0';
1214
address = connect_to;
1215
2314
/* Colon in address indicates IPv6 */
1216
2315
int af;
1217
if(strchr(address, ':') != NULL){
2316
if(strchr(connect_to, ':') != NULL){
1218
2317
af = AF_INET6;
2318
/* Accept [] around IPv6 address - see RFC 5952 */
2319
if(connect_to[0] == '[' and address[-1] == ']')
2320
{
2321
connect_to++;
2322
address[-1] = '\0';
2323
}
1219
2324
} else {
1220
2325
af = AF_INET;
1221
2326
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2327
address = connect_to;
2328
2329
if(quit_now){
2330
goto end;
2331
}
2332
2333
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2336
if(quit_now or ret == 0){
2337
break;
2338
}
2339
if(debug){
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
(int)retry_interval);
2342
}
2343
sleep((unsigned int)retry_interval);
2344
}
2345
2346
if (not quit_now){
1226
2347
exitcode = EXIT_SUCCESS;
1227
2348
}
1228
goto end;
1229
}
1230
2349
2350
goto end;
2351
}
2352
2353
if(quit_now){
2354
goto end;
2355
}
2356
1231
2357
{
1232
2358
AvahiServerConfig config;
1233
2359
/* Do not publish any local Zeroconf records */
1238
2364
config.publish_domain = 0;
1239
2365
1240
2366
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
1244
2369
1245
2370
/* Free the Avahi configuration data */
1246
2371
avahi_server_config_free(&config);
1248
2373
1249
2374
/* Check if creating the Avahi server object succeeded */
1250
2375
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
2378
exitcode = EX_UNAVAILABLE;
2379
goto end;
2380
}
2381
2382
if(quit_now){
1254
2383
goto end;
1255
2384
}
1256
2385
1257
2386
/* Create the Avahi service browser */
1258
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
1261
2391
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
avahi_strerror(avahi_server_errno(mc.server)));
2394
exitcode = EX_UNAVAILABLE;
2395
goto end;
2396
}
2397
2398
if(quit_now){
1265
2399
goto end;
1266
2400
}
1267
2401
1268
2402
/* Run the main loop */
1269
2403
1270
2404
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
}
2407
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2410
if(debug){
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
2413
}
1275
2414
1276
2415
end:
1277
2416
1278
2417
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1280
2419
}
1281
2420
1282
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
1283
2424
if(sb != NULL)
1284
2425
avahi_s_service_browser_free(sb);
1285
2426
1286
2427
if(mc.server != NULL)
1287
2428
avahi_server_free(mc.server);
1288
2429
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
1291
2432
1292
2433
if(gnutls_initialized){
1293
2434
gnutls_certificate_free_credentials(mc.cred);
1299
2440
gpgme_release(mc.ctx);
1300
2441
}
1301
2442
1302
/* Removes the temp directory used by GPGME */
2443
/* Cleans up the circular linked list of Mandos servers the client
2444
has seen */
2445
if(mc.current_server != NULL){
2446
mc.current_server->prev->next = NULL;
2447
while(mc.current_server != NULL){
2448
server *next = mc.current_server->next;
2449
free(mc.current_server);
2450
mc.current_server = next;
2451
}
2452
}
2453
2454
/* Re-raise priviliges */
2455
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2472
}
2473
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2477
}
2478
}
2479
2480
lower_privileges_permanently();
2481
}
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2486
/* Removes the GPGME temp directory and all files inside */
1303
2487
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2488
struct dirent **direntries = NULL;
2489
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2491
alphasort);
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
2494
direntry = direntries[i];
1324
2495
char *fullname = NULL;
1325
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
2497
direntry->d_name);
1327
2498
if(ret < 0){
1328
perror("asprintf");
2499
perror_plus("asprintf");
1329
2500
continue;
1330
2501
}
1331
2502
ret = remove(fullname);
1332
2503
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
1335
2506
}
1336
2507
free(fullname);
1337
2508
}
1338
closedir(d);
2509
}
2510
2511
/* need to clean even if 0 because man page doesn't specify */
2512
free(direntries);
2513
if (numentries == -1){
2514
perror_plus("scandir");
1339
2515
}
1340
2516
ret = rmdir(tempdir);
1341
2517
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2518
perror_plus("rmdir");
2519
}
2520
}
2521
2522
if(quit_now){
2523
sigemptyset(&old_sigterm_action.sa_mask);
2524
old_sigterm_action.sa_handler = SIG_DFL;
2525
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2526
&old_sigterm_action,
2527
NULL));
2528
if(ret == -1){
2529
perror_plus("sigaction");
2530
}
2531
do {
2532
ret = raise(signal_received);
2533
} while(ret != 0 and errno == EINTR);
2534
if(ret != 0){
2535
perror_plus("raise");
2536
abort();
2537
}
2538
TEMP_FAILURE_RETRY(pause());
1344
2539
}
1345
2540
1346
2541
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0