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237.2.131
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-10 17:21:36 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090910172136-plhvv6jjz8bjrhz4
* plugins.d/mandos-client.c (init_gnutls_session): Retry interrupted
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
- 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
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
85
98
86
#ifdef __linux__
99
87
#include <sys/klog.h> /* klogctl() */
117
105
init_gnutls_session(),
118
106
GNUTLS_* */
119
107
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
122
110
123
111
/* GPGME */
124
112
#include <gpgme.h> /* All GPGME types, constants and
132
120
#define PATHDIR "/conf/conf.d/mandos"
133
121
#define SECKEY "seckey.txt"
134
122
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
123
137
124
bool debug = false;
138
125
static const char mandos_protocol_version[] = "1";
139
126
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
128
158
129
/* Used for passing in values through the Avahi callback functions */
159
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
160
132
AvahiServer *server;
161
133
gnutls_certificate_credentials_t cred;
162
134
unsigned int dh_bits;
163
135
gnutls_dh_params_t dh_params;
164
136
const char *priority;
165
137
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
138
} mandos_context;
170
139
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), nonnull))
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
}
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" };
195
144
196
145
/*
197
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
147
* bytes. "buffer_capacity" is how much is currently allocated,
199
148
* "buffer_length" is how much is already used.
200
149
*/
201
__attribute__((nonnull, warn_unused_result))
202
150
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
151
size_t buffer_capacity){
204
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
211
155
return 0;
212
156
}
213
*buffer = new_buf;
214
157
buffer_capacity += BUFFER_SIZE;
215
158
}
216
159
return buffer_capacity;
217
160
}
218
161
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
257
162
/*
258
163
* Initialize GPGME.
259
164
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
263
167
gpgme_error_t rc;
264
168
gpgme_engine_info_t engine_info;
265
169
170
266
171
/*
267
172
* Helper function to insert pub and seckey to the engine keyring.
268
173
*/
273
178
274
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
275
180
if(fd == -1){
276
perror_plus("open");
181
perror("open");
277
182
return false;
278
183
}
279
184
280
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
281
186
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
284
189
return false;
285
190
}
286
191
287
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
288
193
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
291
196
return false;
292
197
}
293
198
294
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
295
200
if(ret == -1){
296
perror_plus("close");
201
perror("close");
297
202
}
298
203
gpgme_data_release(pgp_data);
299
204
return true;
300
205
}
301
206
302
207
if(debug){
303
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
304
209
}
305
210
306
211
/* Init GPGME */
307
212
gpgme_check_version(NULL);
308
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
309
214
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
312
217
return false;
313
218
}
314
219
315
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
316
221
rc = gpgme_get_engine_info(&engine_info);
317
222
if(rc != GPG_ERR_NO_ERROR){
318
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
320
225
return false;
321
226
}
322
227
while(engine_info != NULL){
328
233
engine_info = engine_info->next;
329
234
}
330
235
if(engine_info == NULL){
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
237
return false;
334
238
}
335
239
336
240
/* Create new GPGME "context" */
337
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
338
242
if(rc != GPG_ERR_NO_ERROR){
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
342
245
return false;
343
246
}
344
247
353
256
* Decrypt OpenPGP data.
354
257
* Returns -1 on error
355
258
*/
356
__attribute__((nonnull, warn_unused_result))
357
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
358
260
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
261
char **plaintext){
361
262
gpgme_data_t dh_crypto, dh_plain;
362
263
gpgme_error_t rc;
363
264
ssize_t ret;
365
266
ssize_t plaintext_length = 0;
366
267
367
268
if(debug){
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
369
270
}
370
271
371
272
/* Create new GPGME data buffer from memory cryptotext */
372
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
373
274
0);
374
275
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
377
278
return -1;
378
279
}
379
280
380
281
/* Create new empty GPGME data buffer for the plaintext */
381
282
rc = gpgme_data_new(&dh_plain);
382
283
if(rc != GPG_ERR_NO_ERROR){
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
386
286
gpgme_data_release(dh_crypto);
387
287
return -1;
388
288
}
389
289
390
290
/* Decrypt data from the cryptotext data buffer to the plaintext
391
291
data buffer */
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
393
293
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
396
296
plaintext_length = -1;
397
297
if(debug){
398
298
gpgme_decrypt_result_t result;
399
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
400
300
if(result == NULL){
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
402
302
} else {
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
407
307
if(result->file_name != NULL){
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
409
309
}
410
310
gpgme_recipient_t recipient;
411
311
recipient = result->recipients;
412
312
while(recipient != NULL){
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
420
319
recipient = recipient->next;
421
320
}
422
321
}
425
324
}
426
325
427
326
if(debug){
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
429
328
}
430
329
431
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
432
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
433
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
434
333
plaintext_length = -1;
435
334
goto decrypt_end;
436
335
}
438
337
*plaintext = NULL;
439
338
while(true){
440
339
plaintext_capacity = incbuffer(plaintext,
441
(size_t)plaintext_length,
442
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
443
342
if(plaintext_capacity == 0){
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
447
346
}
448
347
449
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
454
353
break;
455
354
}
456
355
if(ret < 0){
457
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
458
357
plaintext_length = -1;
459
358
goto decrypt_end;
460
359
}
462
361
}
463
362
464
363
if(debug){
465
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
466
365
for(ssize_t i = 0; i < plaintext_length; i++){
467
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
468
367
}
479
378
return plaintext_length;
480
379
}
481
380
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
485
384
if(ret == NULL)
486
385
ret = "(unknown)";
487
386
return ret;
488
387
}
489
388
490
389
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
390
static void debuggnutls(__attribute__((unused)) int level,
493
391
const char* string){
494
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
495
393
}
496
394
497
__attribute__((nonnull, warn_unused_result))
498
395
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
396
const char *seckeyfilename){
501
397
int ret;
502
398
503
399
if(debug){
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
505
401
}
506
402
507
403
ret = gnutls_global_init();
508
404
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
511
407
return -1;
512
408
}
513
409
520
416
}
521
417
522
418
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
524
420
if(ret != GNUTLS_E_SUCCESS){
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
527
426
gnutls_global_deinit();
528
427
return -1;
529
428
}
530
429
531
430
if(debug){
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
536
434
}
537
435
538
436
ret = gnutls_certificate_set_openpgp_key_file
539
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
540
438
GNUTLS_OPENPGP_FMT_BASE64);
541
439
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
547
445
goto globalfail;
548
446
}
549
447
550
448
/* GnuTLS server initialization */
551
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
552
450
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
556
453
goto globalfail;
557
454
}
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
559
456
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
562
459
goto globalfail;
563
460
}
564
461
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
566
463
567
464
return 0;
568
465
569
466
globalfail:
570
467
571
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
572
469
gnutls_global_deinit();
573
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
574
471
return -1;
575
472
}
576
473
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
580
475
int ret;
581
476
/* GnuTLS session creation */
582
477
do {
583
478
ret = gnutls_init(session, GNUTLS_SERVER);
584
if(quit_now){
585
return -1;
586
}
587
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
588
480
if(ret != GNUTLS_E_SUCCESS){
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
592
483
}
593
484
594
485
{
595
486
const char *err;
596
487
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
598
if(quit_now){
599
gnutls_deinit(*session);
600
return -1;
601
}
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
603
490
if(ret != GNUTLS_E_SUCCESS){
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
607
494
gnutls_deinit(*session);
608
495
return -1;
609
496
}
611
498
612
499
do {
613
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
615
if(quit_now){
616
gnutls_deinit(*session);
617
return -1;
618
}
501
mc.cred);
619
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
620
503
if(ret != GNUTLS_E_SUCCESS){
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
623
506
gnutls_deinit(*session);
624
507
return -1;
625
508
}
627
510
/* ignore client certificate if any. */
628
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
629
512
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
631
514
632
515
return 0;
633
516
}
636
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
637
520
__attribute__((unused)) const char *txt){}
638
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
639
525
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
526
static int start_mandos_communication(const char *ip, uint16_t port,
642
527
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
528
int af){
644
529
int ret, tcp_sd = -1;
645
530
ssize_t sret;
646
struct sockaddr_storage to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
647
535
char *buffer = NULL;
648
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
649
537
size_t buffer_length = 0;
650
538
size_t buffer_capacity = 0;
651
539
size_t written;
652
int retval = -1;
540
int retval = 0;
653
541
gnutls_session_t session;
654
542
int pf; /* Protocol family */
655
543
656
errno = 0;
657
658
544
if(quit_now){
659
errno = EINTR;
660
545
return -1;
661
546
}
662
547
668
553
pf = PF_INET;
669
554
break;
670
555
default:
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
672
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
673
557
return -1;
674
558
}
675
559
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
560
ret = init_gnutls_session(&session);
709
561
if(ret != 0){
710
562
return -1;
711
563
}
712
564
713
565
if(debug){
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
716
568
}
717
569
718
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
719
571
if(tcp_sd < 0){
720
int e = errno;
721
perror_plus("socket");
722
errno = e;
572
perror("socket");
573
retval = -1;
723
574
goto mandos_end;
724
575
}
725
576
726
577
if(quit_now){
727
errno = EINTR;
728
578
goto mandos_end;
729
579
}
730
580
731
581
memset(&to, 0, sizeof(to));
732
582
if(af == AF_INET6){
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
585
} else { /* IPv4 */
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
738
588
}
739
589
if(ret < 0 ){
740
int e = errno;
741
perror_plus("inet_pton");
742
errno = e;
590
perror("inet_pton");
591
retval = -1;
743
592
goto mandos_end;
744
593
}
745
594
if(ret == 0){
746
int e = errno;
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
748
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
749
597
goto mandos_end;
750
598
}
751
599
if(af == AF_INET6){
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
755
607
if(if_index == AVAHI_IF_UNSPEC){
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
758
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
759
611
goto mandos_end;
760
612
}
761
613
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
614
to.in6.sin6_scope_id = (uint32_t)if_index;
763
615
}
764
616
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
766
620
}
767
621
768
622
if(quit_now){
769
errno = EINTR;
770
623
goto mandos_end;
771
624
}
772
625
774
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
775
628
char interface[IF_NAMESIZE];
776
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
perror_plus("if_indextoname");
630
perror("if_indextoname");
778
631
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
781
634
}
782
635
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
785
638
}
786
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
788
642
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
793
645
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
798
648
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
805
655
}
806
656
}
807
657
808
658
if(quit_now){
809
errno = EINTR;
810
659
goto mandos_end;
811
660
}
812
661
813
662
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
664
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
666
}
820
667
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
int e = errno;
823
perror_plus("connect");
824
errno = e;
825
}
668
perror("connect");
669
retval = -1;
826
670
goto mandos_end;
827
671
}
828
672
829
673
if(quit_now){
830
errno = EINTR;
831
674
goto mandos_end;
832
675
}
833
676
836
679
while(true){
837
680
size_t out_size = strlen(out);
838
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
839
out_size - written));
682
out_size - written));
840
683
if(ret == -1){
841
int e = errno;
842
perror_plus("write");
843
errno = e;
684
perror("write");
685
retval = -1;
844
686
goto mandos_end;
845
687
}
846
688
written += (size_t)ret;
856
698
}
857
699
858
700
if(quit_now){
859
errno = EINTR;
860
701
goto mandos_end;
861
702
}
862
703
}
863
704
864
705
if(debug){
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
866
707
}
867
708
868
709
if(quit_now){
869
errno = EINTR;
870
710
goto mandos_end;
871
711
}
872
712
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
878
714
879
715
if(quit_now){
880
errno = EINTR;
881
716
goto mandos_end;
882
717
}
883
718
884
719
do {
885
720
ret = gnutls_handshake(session);
886
721
if(quit_now){
887
errno = EINTR;
888
722
goto mandos_end;
889
723
}
890
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
891
725
892
726
if(ret != GNUTLS_E_SUCCESS){
893
727
if(debug){
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
895
729
gnutls_perror(ret);
896
730
}
897
errno = EPROTO;
731
retval = -1;
898
732
goto mandos_end;
899
733
}
900
734
901
735
/* Read OpenPGP packet that contains the wanted password */
902
736
903
737
if(debug){
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
906
740
}
907
741
908
742
while(true){
909
743
910
744
if(quit_now){
911
errno = EINTR;
912
745
goto mandos_end;
913
746
}
914
747
915
748
buffer_capacity = incbuffer(&buffer, buffer_length,
916
buffer_capacity);
749
buffer_capacity);
917
750
if(buffer_capacity == 0){
918
int e = errno;
919
perror_plus("incbuffer");
920
errno = e;
751
perror("incbuffer");
752
retval = -1;
921
753
goto mandos_end;
922
754
}
923
755
924
756
if(quit_now){
925
errno = EINTR;
926
757
goto mandos_end;
927
758
}
928
759
941
772
ret = gnutls_handshake(session);
942
773
943
774
if(quit_now){
944
errno = EINTR;
945
775
goto mandos_end;
946
776
}
947
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
948
778
if(ret < 0){
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
780
gnutls_perror(ret);
952
errno = EPROTO;
781
retval = -1;
953
782
goto mandos_end;
954
783
}
955
784
break;
956
785
default:
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
959
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
errno = EIO;
961
790
goto mandos_end;
962
791
}
963
792
} else {
966
795
}
967
796
968
797
if(debug){
969
fprintf_plus(stderr, "Closing TLS session\n");
970
}
971
972
if(quit_now){
973
errno = EINTR;
974
goto mandos_end;
975
}
976
977
do {
978
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
979
if(quit_now){
980
errno = EINTR;
981
goto mandos_end;
982
}
983
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
984
810
985
811
if(buffer_length > 0){
986
812
ssize_t decrypted_buffer_size;
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
989
816
if(decrypted_buffer_size >= 0){
990
817
991
818
written = 0;
992
819
while(written < (size_t) decrypted_buffer_size){
993
820
if(quit_now){
994
errno = EINTR;
995
821
goto mandos_end;
996
822
}
997
823
999
825
(size_t)decrypted_buffer_size - written,
1000
826
stdout);
1001
827
if(ret == 0 and ferror(stdout)){
1002
int e = errno;
1003
828
if(debug){
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1006
831
}
1007
errno = e;
1008
goto mandos_end;
832
retval = -1;
833
break;
1009
834
}
1010
835
written += (size_t)ret;
1011
836
}
1012
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1013
840
}
841
} else {
842
retval = -1;
1014
843
}
1015
844
1016
845
/* Shutdown procedure */
1017
846
1018
847
mandos_end:
1019
{
1020
int e = errno;
1021
free(decrypted_buffer);
1022
free(buffer);
1023
if(tcp_sd >= 0){
1024
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1025
}
1026
if(ret == -1){
1027
if(e == 0){
1028
e = errno;
1029
}
1030
perror_plus("close");
1031
}
1032
gnutls_deinit(session);
1033
errno = e;
1034
if(quit_now){
1035
errno = EINTR;
1036
retval = -1;
1037
}
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1038
858
}
1039
859
return retval;
1040
860
}
1041
861
1042
__attribute__((nonnull))
1043
862
static void resolve_callback(AvahiSServiceResolver *r,
1044
863
AvahiIfIndex interface,
1045
864
AvahiProtocol proto,
1053
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
874
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1060
877
1061
878
/* Called whenever a service has been resolved successfully or
1062
879
timed out */
1068
885
switch(event){
1069
886
default:
1070
887
case AVAHI_RESOLVER_FAILURE:
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1076
891
break;
1077
892
1078
893
case AVAHI_RESOLVER_FOUND:
1080
895
char ip[AVAHI_ADDRESS_STR_MAX];
1081
896
avahi_address_snprint(ip, sizeof(ip), address);
1082
897
if(debug){
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1086
901
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1091
904
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1093
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
905
avahi_simple_poll_quit(mc.simple_poll);
1100
906
}
1101
907
}
1102
908
}
1112
918
const char *domain,
1113
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
920
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1119
923
1120
924
/* Called whenever a new services becomes available on the LAN or
1121
925
is removed from the LAN */
1128
932
default:
1129
933
case AVAHI_BROWSER_FAILURE:
1130
934
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1135
938
return;
1136
939
1137
940
case AVAHI_BROWSER_NEW:
1140
943
the callback function is called the Avahi server will free the
1141
944
resolver for us. */
1142
945
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1151
951
break;
1152
952
1153
953
case AVAHI_BROWSER_REMOVE:
1156
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1157
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1158
958
if(debug){
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
960
}
1162
961
break;
1163
962
}
1164
963
}
1165
964
1166
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1167
966
static void handle_sigterm(int sig){
1168
967
if(quit_now){
1169
968
return;
1171
970
quit_now = 1;
1172
971
signal_received = sig;
1173
972
int old_errno = errno;
1174
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1177
}
1178
errno = old_errno;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1196
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
}
1201
return false;
1202
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1209
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1211
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1214
}
1215
return false;
1216
}
1217
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1219
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1222
}
1223
return true;
1224
}
1225
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1230
}
1231
return false;
1232
}
1233
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1235
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1238
}
1239
return false;
1240
}
1241
1242
/* Accept this device */
1243
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1249
/*
1250
* This function determines if a directory entry in /sys/class/net
1251
* corresponds to an acceptable network device.
1252
* (This function is passed to scandir(3) as a filter function.)
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
int good_interface(const struct dirent *if_entry){
1256
if(if_entry->d_name[0] == '.'){
1257
return 0;
1258
}
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1271
}
1272
return 1;
1273
}
1274
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
int notdotentries(const struct dirent *direntry){
1311
/* Skip "." and ".." */
1312
if(direntry->d_name[0] == '.'
1313
and (direntry->d_name[1] == '\0'
1314
or (direntry->d_name[1] == '.'
1315
and direntry->d_name[2] == '\0'))){
1316
return 0;
1317
}
1318
return 1;
1319
}
1320
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
1859
977
}
1860
978
1861
979
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1866
980
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
981
int error;
1868
982
int ret;
1869
983
intmax_t tmpmax;
1870
984
char *tmp;
1871
985
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
1874
993
char tempdir[] = "/tmp/mandosXXXXXX";
1875
994
bool tempdir_created = false;
1876
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
996
const char *seckey = PATHDIR "/" SECKEY;
1878
997
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
998
1881
999
bool gnutls_initialized = false;
1882
1000
bool gpgme_initialized = false;
1883
1001
float delay = 2.5f;
1884
double retry_interval = 10; /* 10s between trying a server and
1885
retrying the same server again */
1886
1002
1887
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
struct sigaction old_sigterm_action;
1888
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1889
1005
1890
1006
uid = getuid();
1894
1010
errno = 0;
1895
1011
ret = setgid(gid);
1896
1012
if(ret == -1){
1897
perror_plus("setgid");
1013
perror("setgid");
1898
1014
}
1899
1015
1900
1016
/* Lower user privileges (temporarily) */
1901
1017
errno = 0;
1902
1018
ret = seteuid(uid);
1903
1019
if(ret == -1){
1904
perror_plus("seteuid");
1020
perror("seteuid");
1905
1021
}
1906
1022
1907
1023
if(quit_now){
1942
1058
.arg = "SECONDS",
1943
1059
.doc = "Maximum delay to wait for interface startup",
1944
1060
.group = 2 },
1945
{ .name = "retry", .key = 132,
1946
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1952
.group = 2 },
1953
/*
1954
* These reproduce what we would get without ARGP_NO_HELP
1955
*/
1956
{ .name = "help", .key = '?',
1957
.doc = "Give this help list", .group = -1 },
1958
{ .name = "usage", .key = -3,
1959
.doc = "Give a short usage message", .group = -1 },
1960
{ .name = "version", .key = 'V',
1961
.doc = "Print program version", .group = -1 },
1962
1061
{ .name = NULL }
1963
1062
};
1964
1063
1965
1064
error_t parse_opt(int key, char *arg,
1966
1065
struct argp_state *state){
1967
errno = 0;
1968
1066
switch(key){
1969
1067
case 128: /* --debug */
1970
1068
debug = true;
1973
1071
connect_to = arg;
1974
1072
break;
1975
1073
case 'i': /* --interface */
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1074
interface = arg;
1981
1075
break;
1982
1076
case 's': /* --seckey */
1983
1077
seckey = arg;
1990
1084
tmpmax = strtoimax(arg, &tmp, 10);
1991
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1992
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1993
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1994
1089
}
1995
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1996
1091
break;
2001
1096
errno = 0;
2002
1097
delay = strtof(arg, &tmp);
2003
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
2004
argp_error(state, "Bad delay");
2005
}
2006
case 132: /* --retry */
2007
errno = 0;
2008
retry_interval = strtod(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'
2010
or (retry_interval * 1000) > INT_MAX
2011
or retry_interval < 0){
2012
argp_error(state, "Bad retry interval");
2013
}
2014
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
2017
break;
2018
/*
2019
* These reproduce what we would get without ARGP_NO_HELP
2020
*/
2021
case '?': /* --help */
2022
argp_state_help(state, state->out_stream,
2023
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2024
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2025
case -3: /* --usage */
2026
argp_state_help(state, state->out_stream,
2027
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
case 'V': /* --version */
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2030
exit(argp_err_exit_status);
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
2031
1106
break;
2032
1107
default:
2033
1108
return ARGP_ERR_UNKNOWN;
2034
1109
}
2035
return errno;
1110
return 0;
2036
1111
}
2037
1112
2038
1113
struct argp argp = { .options = options, .parser = parse_opt,
2039
1114
.args_doc = "",
2040
1115
.doc = "Mandos client -- Get and decrypt"
2041
1116
" passwords from a Mandos server" };
2042
ret = argp_parse(&argp, argc, argv,
2043
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2044
switch(ret){
2045
case 0:
2046
break;
2047
case ENOMEM:
2048
default:
2049
errno = ret;
2050
perror_plus("argp_parse");
2051
exitcode = EX_OSERR;
2052
goto end;
2053
case EINVAL:
2054
exitcode = EX_USAGE;
2055
goto end;
2056
}
2057
}
2058
2059
{
2060
/* Work around Debian bug #633582:
2061
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
2152
1123
}
2153
1124
2154
1125
if(not debug){
2159
1130
from the signal handler */
2160
1131
/* Initialize the pseudo-RNG for Avahi */
2161
1132
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
2166
exitcode = EX_UNAVAILABLE;
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2167
1137
goto end;
2168
1138
}
2169
1139
2170
1140
sigemptyset(&sigterm_action.sa_mask);
2171
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2172
1142
if(ret == -1){
2173
perror_plus("sigaddset");
2174
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2175
1145
goto end;
2176
1146
}
2177
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2178
1148
if(ret == -1){
2179
perror_plus("sigaddset");
2180
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2181
1151
goto end;
2182
1152
}
2183
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2184
1154
if(ret == -1){
2185
perror_plus("sigaddset");
2186
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2187
1157
goto end;
2188
1158
}
2189
1159
/* Need to check if the handler is SIG_IGN before handling:
2192
1162
*/
2193
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2194
1164
if(ret == -1){
2195
perror_plus("sigaction");
2196
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2197
1167
}
2198
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2199
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
2200
1170
if(ret == -1){
2201
perror_plus("sigaction");
2202
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2203
1173
goto end;
2204
1174
}
2205
1175
}
2206
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2207
1177
if(ret == -1){
2208
perror_plus("sigaction");
2209
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2210
1180
}
2211
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
2212
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2213
1183
if(ret == -1){
2214
perror_plus("sigaction");
2215
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2216
1186
goto end;
2217
1187
}
2218
1188
}
2219
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2220
1190
if(ret == -1){
2221
perror_plus("sigaction");
2222
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2223
1193
}
2224
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2225
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2226
1196
if(ret == -1){
2227
perror_plus("sigaction");
2228
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2229
1199
goto end;
2230
1200
}
2231
1201
}
2232
1202
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
2255
1338
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
}
2281
}
2282
break;
2283
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2311
1345
}
2312
1346
2313
1347
if(quit_now){
2314
1348
goto end;
2315
1349
}
2316
1350
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
1351
ret = init_gnutls_global(pubkey, seckey);
2318
1352
if(ret == -1){
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
2320
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2321
1355
goto end;
2322
1356
} else {
2323
1357
gnutls_initialized = true;
2327
1361
goto end;
2328
1362
}
2329
1363
1364
tempdir_created = true;
2330
1365
if(mkdtemp(tempdir) == NULL){
2331
perror_plus("mkdtemp");
1366
tempdir_created = false;
1367
perror("mkdtemp");
2332
1368
goto end;
2333
1369
}
2334
tempdir_created = true;
2335
1370
2336
1371
if(quit_now){
2337
1372
goto end;
2338
1373
}
2339
1374
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
2342
exitcode = EX_UNAVAILABLE;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2343
1378
goto end;
2344
1379
} else {
2345
1380
gpgme_initialized = true;
2353
1388
/* Connect directly, do not use Zeroconf */
2354
1389
/* (Mainly meant for debugging) */
2355
1390
char *address = strrchr(connect_to, ':');
2356
2357
1391
if(address == NULL){
2358
fprintf_plus(stderr, "No colon in address\n");
2359
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2360
1394
goto end;
2361
1395
}
2362
1396
2364
1398
goto end;
2365
1399
}
2366
1400
2367
in_port_t port;
1401
uint16_t port;
2368
1402
errno = 0;
2369
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2370
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
2373
exitcode = EX_USAGE;
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2374
1408
goto end;
2375
1409
}
2376
1410
2377
1411
if(quit_now){
2378
1412
goto end;
2379
1413
}
2380
1414
2381
port = (in_port_t)tmpmax;
1415
port = (uint16_t)tmpmax;
2382
1416
*address = '\0';
1417
address = connect_to;
2383
1418
/* Colon in address indicates IPv6 */
2384
1419
int af;
2385
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2386
1421
af = AF_INET6;
2387
/* Accept [] around IPv6 address - see RFC 5952 */
2388
if(connect_to[0] == '[' and address[-1] == ']')
2389
{
2390
connect_to++;
2391
address[-1] = '\0';
2392
}
2393
1422
} else {
2394
1423
af = AF_INET;
2395
1424
}
2396
address = connect_to;
2397
1425
2398
1426
if(quit_now){
2399
1427
goto end;
2400
1428
}
2401
1429
2402
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
2405
if(quit_now or ret == 0){
2406
break;
2407
}
2408
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
2411
}
2412
sleep((unsigned int)retry_interval);
2413
}
2414
2415
if(not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2416
1434
exitcode = EXIT_SUCCESS;
2417
1435
}
2418
2419
1436
goto end;
2420
1437
}
2421
1438
2433
1450
config.publish_domain = 0;
2434
1451
2435
1452
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
2438
1456
2439
1457
/* Free the Avahi configuration data */
2440
1458
avahi_server_config_free(&config);
2442
1460
2443
1461
/* Check if creating the Avahi server object succeeded */
2444
1462
if(mc.server == NULL){
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
2447
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2448
1466
goto end;
2449
1467
}
2450
1468
2455
1473
/* Create the Avahi service browser */
2456
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
1476
NULL, 0, browse_callback, NULL);
2460
1477
if(sb == NULL){
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
2463
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2464
1481
goto end;
2465
1482
}
2466
1483
2471
1488
/* Run the main loop */
2472
1489
2473
1490
if(debug){
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
}
2476
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2479
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
2482
}
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
2483
1495
2484
1496
end:
2485
1497
2486
1498
if(debug){
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2488
1500
}
2489
1501
2490
1502
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
1503
if(sb != NULL)
2494
1504
avahi_s_service_browser_free(sb);
2495
1505
2496
1506
if(mc.server != NULL)
2497
1507
avahi_server_free(mc.server);
2498
1508
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
2501
1511
2502
1512
if(gnutls_initialized){
2503
1513
gnutls_certificate_free_credentials(mc.cred);
2509
1519
gpgme_release(mc.ctx);
2510
1520
}
2511
1521
2512
/* Cleans up the circular linked list of Mandos servers the client
2513
has seen */
2514
if(mc.current_server != NULL){
2515
mc.current_server->prev->next = NULL;
2516
while(mc.current_server != NULL){
2517
server *next = mc.current_server->next;
2518
free(mc.current_server);
2519
mc.current_server = next;
2520
}
2521
}
2522
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
/* Removes the GPGME temp directory and all files inside */
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
2562
1555
if(tempdir_created){
2563
struct dirent **direntries = NULL;
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
2568
for(int i = 0; i < numentries; i++){
2569
direntry = direntries[i];
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
2570
1576
char *fullname = NULL;
2571
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
2572
1578
direntry->d_name);
2573
1579
if(ret < 0){
2574
perror_plus("asprintf");
1580
perror("asprintf");
2575
1581
continue;
2576
1582
}
2577
1583
ret = remove(fullname);
2578
1584
if(ret == -1){
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2581
1587
}
2582
1588
free(fullname);
2583
1589
}
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
1590
closedir(d);
2590
1591
}
2591
1592
ret = rmdir(tempdir);
2592
1593
if(ret == -1 and errno != ENOENT){
2593
perror_plus("rmdir");
1594
perror("rmdir");
2594
1595
}
2595
1596
}
2596
1597
2597
1598
if(quit_now){
2598
1599
sigemptyset(&old_sigterm_action.sa_mask);
2599
1600
old_sigterm_action.sa_handler = SIG_DFL;
2600
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2601
&old_sigterm_action,
2602
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2603
1602
if(ret == -1){
2604
perror_plus("sigaction");
2605
}
2606
do {
2607
ret = raise(signal_received);
2608
} while(ret != 0 and errno == EINTR);
2609
if(ret != 0){
2610
perror_plus("raise");
2611
abort();
2612
}
2613
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2614
1606
}
2615
1607
2616
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0