To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 24.1.131
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.131
- Committer: Björn Påhlsson
- Date: 2009-02-06 01:15:52 UTC
- mfrom: (299 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 306.
- Revision ID: belorn@braxen-20090206011552-p07z71hj60jm7ncl
merge
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
91
78
#ifdef __linux__
92
79
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
80
#endif
94
81
95
82
/* Avahi */
96
83
/* All Avahi types, constants and functions
110
97
init_gnutls_session(),
111
98
GNUTLS_* */
112
99
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
115
102
116
103
/* GPGME */
117
104
#include <gpgme.h> /* All GPGME types, constants and
125
112
#define PATHDIR "/conf/conf.d/mandos"
126
113
#define SECKEY "seckey.txt"
127
114
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
115
130
116
bool debug = false;
131
117
static const char mandos_protocol_version[] = "1";
132
118
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
120
149
121
/* Used for passing in values through the Avahi callback functions */
150
122
typedef struct {
155
127
gnutls_dh_params_t dh_params;
156
128
const char *priority;
157
129
gpgme_ctx_t ctx;
158
server *current_server;
159
130
} mandos_context;
160
131
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
132
/*
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
180
135
* "buffer_length" is how much is already used.
181
136
*/
182
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
184
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
141
if(buffer == NULL){
191
146
return buffer_capacity;
192
147
}
193
148
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
149
/*
232
150
* Initialize GPGME.
233
151
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
236
155
gpgme_error_t rc;
237
156
gpgme_engine_info_t engine_info;
238
157
241
160
* Helper function to insert pub and seckey to the engine keyring.
242
161
*/
243
162
bool import_key(const char *filename){
244
int ret;
245
163
int fd;
246
164
gpgme_data_t pgp_data;
247
165
248
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
167
if(fd == -1){
250
perror_plus("open");
168
perror("open");
251
169
return false;
252
170
}
253
171
254
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
173
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
175
gpgme_strsource(rc), gpgme_strerror(rc));
259
176
return false;
260
177
}
261
178
262
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
263
180
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
182
gpgme_strsource(rc), gpgme_strerror(rc));
267
183
return false;
268
184
}
269
185
270
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
187
if(ret == -1){
272
perror_plus("close");
188
perror("close");
273
189
}
274
190
gpgme_data_release(pgp_data);
275
191
return true;
276
192
}
277
193
278
194
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
281
196
}
282
197
283
198
/* Init GPGME */
284
199
gpgme_check_version(NULL);
285
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
201
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
203
gpgme_strsource(rc), gpgme_strerror(rc));
290
204
return false;
291
205
}
292
206
293
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
294
208
rc = gpgme_get_engine_info(&engine_info);
295
209
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
211
gpgme_strsource(rc), gpgme_strerror(rc));
299
212
return false;
300
213
}
307
220
engine_info = engine_info->next;
308
221
}
309
222
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
224
return false;
313
225
}
314
226
315
227
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
317
229
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
321
232
return false;
322
233
}
323
234
325
236
return false;
326
237
}
327
238
328
return true;
239
return true;
329
240
}
330
241
331
242
/*
332
243
* Decrypt OpenPGP data.
333
244
* Returns -1 on error
334
245
*/
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
336
248
size_t crypto_size,
337
249
char **plaintext){
338
250
gpgme_data_t dh_crypto, dh_plain;
342
254
ssize_t plaintext_length = 0;
343
255
344
256
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
258
}
348
259
349
260
/* Create new GPGME data buffer from memory cryptotext */
350
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
262
0);
352
263
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
265
gpgme_strsource(rc), gpgme_strerror(rc));
356
266
return -1;
357
267
}
359
269
/* Create new empty GPGME data buffer for the plaintext */
360
270
rc = gpgme_data_new(&dh_plain);
361
271
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
273
gpgme_strsource(rc), gpgme_strerror(rc));
365
274
gpgme_data_release(dh_crypto);
366
275
return -1;
368
277
369
278
/* Decrypt data from the cryptotext data buffer to the plaintext
370
279
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
281
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
283
gpgme_strsource(rc), gpgme_strerror(rc));
376
284
plaintext_length = -1;
377
285
if(debug){
378
286
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
380
288
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
290
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
386
292
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
389
294
result->wrong_key_usage);
390
295
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
393
297
}
394
298
gpgme_recipient_t recipient;
395
299
recipient = result->recipients;
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
407
310
}
408
311
}
409
312
}
411
314
}
412
315
413
316
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
318
}
417
319
418
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
421
323
plaintext_length = -1;
422
324
goto decrypt_end;
423
325
}
424
326
425
327
*plaintext = NULL;
426
328
while(true){
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
430
332
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
434
336
}
435
337
436
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
343
break;
442
344
}
443
345
if(ret < 0){
444
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
445
347
plaintext_length = -1;
446
348
goto decrypt_end;
447
349
}
449
351
}
450
352
451
353
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
454
355
for(ssize_t i = 0; i < plaintext_length; i++){
455
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
357
}
478
379
/* GnuTLS log function callback */
479
380
static void debuggnutls(__attribute__((unused)) int level,
480
381
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
482
383
}
483
384
484
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
485
387
const char *seckeyfilename){
486
388
int ret;
487
389
488
390
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
491
392
}
492
393
493
394
ret = gnutls_global_init();
494
395
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
497
398
return -1;
498
399
}
499
400
506
407
}
507
408
508
409
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
510
411
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
513
417
gnutls_global_deinit();
514
418
return -1;
515
419
}
516
420
517
421
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
424
seckeyfilename);
522
425
}
523
426
524
427
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
526
429
GNUTLS_OPENPGP_FMT_BASE64);
527
430
if(ret != GNUTLS_E_SUCCESS){
528
431
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
534
436
goto globalfail;
535
437
}
536
438
537
439
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
539
441
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
443
" %s\n", safer_gnutls_strerror(ret));
543
444
goto globalfail;
544
445
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
447
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
449
safer_gnutls_strerror(ret));
550
450
goto globalfail;
551
451
}
552
452
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
454
555
455
return 0;
556
456
557
457
globalfail:
558
458
559
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
560
460
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
562
462
return -1;
563
463
}
564
464
565
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
566
467
int ret;
567
468
/* GnuTLS session creation */
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
574
470
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
472
safer_gnutls_strerror(ret));
578
473
}
579
474
580
475
{
581
476
const char *err;
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
589
478
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
594
482
gnutls_deinit(*session);
595
483
return -1;
596
484
}
597
485
}
598
486
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
607
489
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
491
safer_gnutls_strerror(ret));
611
492
gnutls_deinit(*session);
612
493
return -1;
613
494
}
614
495
615
496
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
617
499
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
501
620
502
return 0;
621
503
}
627
509
/* Called when a Mandos server is found */
628
510
static int start_mandos_communication(const char *ip, uint16_t port,
629
511
AvahiIfIndex if_index,
630
int af){
631
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
632
514
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
637
516
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
639
518
size_t buffer_length = 0;
640
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
641
521
size_t written;
642
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
643
524
gnutls_session_t session;
644
int pf; /* Protocol family */
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
switch(af){
654
case AF_INET6:
655
pf = PF_INET6;
656
break;
657
case AF_INET:
658
pf = PF_INET;
659
break;
660
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
664
return -1;
665
}
666
667
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
668
527
if(ret != 0){
669
528
return -1;
670
529
}
671
530
672
531
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
675
533
"\n", ip, port);
676
534
}
677
535
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
679
537
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
538
perror("socket");
539
return -1;
684
540
}
685
541
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
689
548
}
690
549
691
550
memset(&to, 0, sizeof(to));
692
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
695
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
698
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
699
555
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
556
perror("inet_pton");
557
return -1;
704
558
}
705
559
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
711
562
}
712
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
720
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
726
}
727
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
729
}
730
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
732
564
-Wconversion and
733
565
-Wunreachable-code */
734
}
735
566
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
740
568
741
569
if(debug){
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
char interface[IF_NAMESIZE];
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
746
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
750
}
751
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
754
}
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
761
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
764
}
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
767
576
} else {
768
577
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
579
}
772
580
}
773
581
}
774
582
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
785
584
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
585
perror("connect");
586
return -1;
797
587
}
798
588
799
589
const char *out = mandos_protocol_version;
801
591
while(true){
802
592
size_t out_size = strlen(out);
803
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
594
out_size - written));
805
595
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
596
perror("write");
597
retval = -1;
809
598
goto mandos_end;
810
599
}
811
600
written += (size_t)ret;
819
608
break;
820
609
}
821
610
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
611
}
828
612
829
613
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
840
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
618
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
619
do{
848
620
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
622
855
623
if(ret != GNUTLS_E_SUCCESS){
856
624
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
626
gnutls_perror(ret);
860
627
}
861
errno = EPROTO;
628
retval = -1;
862
629
goto mandos_end;
863
630
}
864
631
865
632
/* Read OpenPGP packet that contains the wanted password */
866
633
867
634
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
870
637
}
871
638
872
639
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
881
642
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
890
645
goto mandos_end;
891
646
}
892
647
901
656
case GNUTLS_E_AGAIN:
902
657
break;
903
658
case GNUTLS_E_REHANDSHAKE:
904
do {
659
do{
905
660
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
662
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
664
gnutls_perror(ret);
916
errno = EPROTO;
665
retval = -1;
917
666
goto mandos_end;
918
667
}
919
668
break;
920
669
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
670
fprintf(stderr, "Unknown error while reading data from"
923
671
" encrypted session with Mandos server\n");
672
retval = -1;
924
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
926
674
goto mandos_end;
927
675
}
928
676
} else {
931
679
}
932
680
933
681
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
950
686
951
687
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
954
690
&decrypted_buffer);
955
691
if(decrypted_buffer_size >= 0){
956
957
692
written = 0;
958
693
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
964
694
ret = (int)fwrite(decrypted_buffer + written, 1,
965
695
(size_t)decrypted_buffer_size - written,
966
696
stdout);
967
697
if(ret == 0 and ferror(stdout)){
968
int e = errno;
969
698
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
699
fprintf(stderr, "Error writing encrypted data: %s\n",
972
700
strerror(errno));
973
701
}
974
errno = e;
975
goto mandos_end;
702
retval = -1;
703
break;
976
704
}
977
705
written += (size_t)ret;
978
706
}
979
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
980
710
}
711
} else {
712
retval = -1;
981
713
}
982
714
983
715
/* Shutdown procedure */
984
716
985
717
mandos_end:
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
1005
722
}
723
gnutls_deinit(session);
1006
724
return retval;
1007
725
}
1008
726
1009
727
static void resolve_callback(AvahiSServiceResolver *r,
1010
728
AvahiIfIndex interface,
1011
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1012
730
AvahiResolverEvent event,
1013
731
const char *name,
1014
732
const char *type,
1019
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
739
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
1023
742
assert(r);
1024
743
1025
744
/* Called whenever a service has been resolved successfully or
1026
745
timed out */
1027
746
1028
if(quit_now){
1029
return;
1030
}
1031
1032
747
switch(event){
1033
748
default:
1034
749
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
1039
753
break;
1040
754
1041
755
case AVAHI_RESOLVER_FOUND:
1043
757
char ip[AVAHI_ADDRESS_STR_MAX];
1044
758
avahi_address_snprint(ip, sizeof(ip), address);
1045
759
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
762
ip, (intmax_t)interface, port);
1050
763
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1053
765
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
766
avahi_simple_poll_quit(mc->simple_poll);
1058
767
}
1059
768
}
1060
769
}
1070
779
const char *domain,
1071
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
781
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1074
784
assert(b);
1075
785
1076
786
/* Called whenever a new services becomes available on the LAN or
1077
787
is removed from the LAN */
1078
788
1079
if(quit_now){
1080
return;
1081
}
1082
1083
789
switch(event){
1084
790
default:
1085
791
case AVAHI_BROWSER_FAILURE:
1086
792
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
avahi_simple_poll_quit(mc.simple_poll);
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1091
796
return;
1092
797
1093
798
case AVAHI_BROWSER_NEW:
1096
801
the callback function is called the Avahi server will free the
1097
802
resolver for us. */
1098
803
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1105
810
break;
1106
811
1107
812
case AVAHI_BROWSER_REMOVE:
1110
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
817
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
819
}
1116
820
break;
1117
821
}
1118
822
}
1119
823
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
1122
if(quit_now){
1123
return;
1124
}
1125
quit_now = 1;
1126
signal_received = sig;
1127
int old_errno = errno;
1128
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1131
}
1132
errno = old_errno;
1133
}
1134
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
1413
bool run_network_hooks(const char *mode, const char *interface,
1414
const float delay){
1415
struct dirent **direntries;
1416
struct dirent *direntry;
1417
int ret;
1418
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1419
alphasort);
1420
if(numhooks == -1){
1421
perror_plus("scandir");
1422
} else {
1423
int devnull = open("/dev/null", O_RDONLY);
1424
for(int i = 0; i < numhooks; i++){
1425
direntry = direntries[0];
1426
char *fullname = NULL;
1427
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1428
if(ret < 0){
1429
perror_plus("asprintf");
1430
continue;
1431
}
1432
pid_t hook_pid = fork();
1433
if(hook_pid == 0){
1434
/* Child */
1435
dup2(devnull, STDIN_FILENO);
1436
close(devnull);
1437
dup2(STDERR_FILENO, STDOUT_FILENO);
1438
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
if(ret == -1){
1440
perror_plus("setenv");
1441
return false;
1442
}
1443
ret = setenv("DEVICE", interface, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
return false;
1447
}
1448
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
return false;
1452
}
1453
ret = setenv("MODE", mode, 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
return false;
1457
}
1458
char *delaystring;
1459
ret = asprintf(&delaystring, "%f", delay);
1460
if(ret == -1){
1461
perror_plus("asprintf");
1462
return false;
1463
}
1464
ret = setenv("DELAY", delaystring, 1);
1465
if(ret == -1){
1466
free(delaystring);
1467
perror_plus("setenv");
1468
return false;
1469
}
1470
free(delaystring);
1471
ret = execl(fullname, direntry->d_name, mode, NULL);
1472
perror_plus("execl");
1473
} else {
1474
int status;
1475
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1476
perror_plus("waitpid");
1477
free(fullname);
1478
continue;
1479
}
1480
if(WIFEXITED(status)){
1481
if(WEXITSTATUS(status) != 0){
1482
fprintf(stderr, "Mandos plugin mandos-client: "
1483
"Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf(stderr, "Mandos plugin mandos-client: "
1491
"Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf(stderr, "Mandos plugin mandos-client: "
1498
"Warning: network hook \"%s\" crashed\n",
1499
direntry->d_name);
1500
free(fullname);
1501
continue;
1502
}
1503
}
1504
free(fullname);
1505
if(quit_now){
1506
break;
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
1513
1514
824
int main(int argc, char *argv[]){
1515
825
AvahiSServiceBrowser *sb = NULL;
1516
826
int error;
1517
827
int ret;
1518
828
intmax_t tmpmax;
1519
char *tmp;
829
int numchars;
1520
830
int exitcode = EXIT_SUCCESS;
1521
const char *interface = "";
831
const char *interface = "eth0";
1522
832
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
833
int sd;
1525
834
uid_t uid;
1526
835
gid_t gid;
836
char *connect_to = NULL;
1527
837
char tempdir[] = "/tmp/mandosXXXXXX";
1528
838
bool tempdir_created = false;
1529
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
840
const char *seckey = PATHDIR "/" SECKEY;
1531
841
const char *pubkey = PATHDIR "/" PUBKEY;
1532
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1533
846
bool gnutls_initialized = false;
1534
847
bool gpgme_initialized = false;
1535
float delay = 2.5f;
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
1538
1539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1541
1542
uid = getuid();
1543
gid = getgid();
1544
1545
/* Lower any group privileges we might have, just to be safe */
1546
errno = 0;
1547
ret = setgid(gid);
1548
if(ret == -1){
1549
perror_plus("setgid");
1550
}
1551
1552
/* Lower user privileges (temporarily) */
1553
errno = 0;
1554
ret = seteuid(uid);
1555
if(ret == -1){
1556
perror_plus("seteuid");
1557
}
1558
1559
if(quit_now){
1560
goto end;
1561
}
848
double delay = 2.5;
1562
849
1563
850
{
1564
851
struct argp_option options[] = {
1570
857
.group = 1 },
1571
858
{ .name = "interface", .key = 'i',
1572
859
.arg = "NAME",
1573
.doc = "Network interface that will be used to search for"
1574
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1575
862
.group = 1 },
1576
863
{ .name = "seckey", .key = 's',
1577
864
.arg = "FILE",
1594
881
.arg = "SECONDS",
1595
882
.doc = "Maximum delay to wait for interface startup",
1596
883
.group = 2 },
1597
{ .name = "retry", .key = 132,
1598
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1605
/*
1606
* These reproduce what we would get without ARGP_NO_HELP
1607
*/
1608
{ .name = "help", .key = '?',
1609
.doc = "Give this help list", .group = -1 },
1610
{ .name = "usage", .key = -3,
1611
.doc = "Give a short usage message", .group = -1 },
1612
{ .name = "version", .key = 'V',
1613
.doc = "Print program version", .group = -1 },
1614
884
{ .name = NULL }
1615
885
};
1616
886
1617
887
error_t parse_opt(int key, char *arg,
1618
888
struct argp_state *state){
1619
errno = 0;
1620
889
switch(key){
1621
890
case 128: /* --debug */
1622
891
debug = true;
1634
903
pubkey = arg;
1635
904
break;
1636
905
case 129: /* --dh-bits */
1637
errno = 0;
1638
tmpmax = strtoimax(arg, &tmp, 10);
1639
if(errno != 0 or tmp == arg or *tmp != '\0'
1640
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1641
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1642
911
}
1643
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1644
913
break;
1646
915
mc.priority = arg;
1647
916
break;
1648
917
case 131: /* --delay */
1649
errno = 0;
1650
delay = strtof(arg, &tmp);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'){
1652
argp_error(state, "Bad delay");
1653
}
1654
case 132: /* --retry */
1655
errno = 0;
1656
retry_interval = strtod(arg, &tmp);
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1660
argp_error(state, "Bad retry interval");
1661
}
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1666
/*
1667
* These reproduce what we would get without ARGP_NO_HELP
1668
*/
1669
case '?': /* --help */
1670
argp_state_help(state, state->out_stream,
1671
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1672
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1673
case -3: /* --usage */
1674
argp_state_help(state, state->out_stream,
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
case 'V': /* --version */
1677
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1678
fprintf(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1680
927
break;
1681
928
default:
1682
929
return ARGP_ERR_UNKNOWN;
1683
930
}
1684
return errno;
931
return 0;
1685
932
}
1686
933
1687
934
struct argp argp = { .options = options, .parser = parse_opt,
1688
935
.args_doc = "",
1689
936
.doc = "Mandos client -- Get and decrypt"
1690
937
" passwords from a Mandos server" };
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1693
switch(ret){
1694
case 0:
1695
break;
1696
case ENOMEM:
1697
default:
1698
errno = ret;
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1701
goto end;
1702
case EINVAL:
1703
exitcode = EX_USAGE;
1704
goto end;
1705
}
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
struct stat st;
1712
1713
/* Re-raise priviliges */
1714
errno = 0;
1715
ret = seteuid(0);
1716
if(ret == -1){
1717
perror_plus("seteuid");
1718
}
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
1768
/* Run network hooks */
1769
{
1770
/* Re-raise priviliges */
1771
errno = 0;
1772
ret = seteuid(0);
1773
if(ret == -1){
1774
perror_plus("seteuid");
1775
}
1776
if(not run_network_hooks("start", interface, delay)){
1777
goto end;
1778
}
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
}
1786
1787
if(not debug){
1788
avahi_set_log_function(empty_log);
1789
}
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf(stderr, "Mandos plugin mandos-client: "
1807
"Using interface \"%s\"\n", interface);
1808
}
1809
if(interface == NULL){
1810
perror_plus("malloc");
1811
free(direntries);
1812
exitcode = EXIT_FAILURE;
1813
goto end;
1814
}
1815
free(direntries);
1816
} else {
1817
free(direntries);
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Could not find a network interface\n");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1820
941
exitcode = EXIT_FAILURE;
1821
942
goto end;
1822
943
}
1823
944
}
1824
945
1825
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1826
from the signal handler */
1827
/* Initialize the pseudo-RNG for Avahi */
1828
srand((unsigned int) time(NULL));
1829
mc.simple_poll = avahi_simple_poll_new();
1830
if(mc.simple_poll == NULL){
1831
fprintf(stderr, "Mandos plugin mandos-client: "
1832
"Avahi: Failed to create simple poll object.\n");
1833
exitcode = EX_UNAVAILABLE;
1834
goto end;
1835
}
1836
1837
sigemptyset(&sigterm_action.sa_mask);
1838
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1839
if(ret == -1){
1840
perror_plus("sigaddset");
1841
exitcode = EX_OSERR;
1842
goto end;
1843
}
1844
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1845
if(ret == -1){
1846
perror_plus("sigaddset");
1847
exitcode = EX_OSERR;
1848
goto end;
1849
}
1850
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1851
if(ret == -1){
1852
perror_plus("sigaddset");
1853
exitcode = EX_OSERR;
1854
goto end;
1855
}
1856
/* Need to check if the handler is SIG_IGN before handling:
1857
| [[info:libc:Initial Signal Actions]] |
1858
| [[info:libc:Basic Signal Handling]] |
1859
*/
1860
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGINT, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1886
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1887
if(ret == -1){
1888
perror_plus("sigaction");
1889
return EX_OSERR;
1890
}
1891
if(old_sigterm_action.sa_handler != SIG_IGN){
1892
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1893
if(ret == -1){
1894
perror_plus("sigaction");
1895
exitcode = EX_OSERR;
1896
goto end;
1897
}
1898
}
1899
1900
946
/* If the interface is down, bring it up */
1901
if(strcmp(interface, "none") != 0){
1902
if_index = (AvahiIfIndex) if_nametoindex(interface);
1903
if(if_index == 0){
1904
fprintf(stderr, "Mandos plugin mandos-client: "
1905
"No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
947
{
1921
948
#ifdef __linux__
1922
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1924
951
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
952
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
953
perror("klogctl");
1929
954
}
1930
#endif /* __linux__ */
955
#endif
1931
956
1932
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
958
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1936
961
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1947
963
if(ret == -1){
1948
perror_plus("seteuid");
964
perror("klogctl");
1949
965
}
966
#endif
1950
967
goto end;
1951
968
}
1952
969
strcpy(network.ifr_name, interface);
1953
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
971
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1956
973
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1968
975
if(ret == -1){
1969
perror_plus("seteuid");
976
perror("klogctl");
1970
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1971
980
goto end;
1972
981
}
1973
982
if((network.ifr_flags & IFF_UP) == 0){
1974
983
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
985
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1981
988
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
1986
}
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1992
990
if(ret == -1){
1993
perror_plus("seteuid");
991
perror("klogctl");
1994
992
}
993
#endif
1995
994
goto end;
1996
995
}
1997
996
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
2000
998
for(int i=0; i < delay * 4; i++){
2001
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
1000
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
2004
1002
} else if(network.ifr_flags & IFF_RUNNING){
2005
1003
break;
2006
1004
}
2007
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
1006
ret = nanosleep(&sleeptime, NULL);
2009
1007
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
1008
perror("nanosleep");
2011
1009
}
2012
1010
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
2019
1014
}
2020
1015
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
2033
1018
if(ret == -1){
2034
perror_plus("seteuid");
1019
perror("klogctl");
2035
1020
}
2036
}
2037
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
ret = init_gnutls_global(pubkey, seckey);
2043
if(ret == -1){
2044
fprintf(stderr, "Mandos plugin mandos-client: "
2045
"init_gnutls_global failed\n");
2046
exitcode = EX_UNAVAILABLE;
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2047
1041
goto end;
2048
1042
} else {
2049
1043
gnutls_initialized = true;
2050
1044
}
2051
1045
2052
if(quit_now){
2053
goto end;
2054
}
2055
2056
1046
if(mkdtemp(tempdir) == NULL){
2057
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2058
1048
goto end;
2059
1049
}
2060
1050
tempdir_created = true;
2061
1051
2062
if(quit_now){
2063
goto end;
2064
}
2065
2066
if(not init_gpgme(pubkey, seckey, tempdir)){
2067
fprintf(stderr, "Mandos plugin mandos-client: "
2068
"init_gpgme failed\n");
2069
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2070
1055
goto end;
2071
1056
} else {
2072
1057
gpgme_initialized = true;
2073
1058
}
2074
1059
2075
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2076
1064
goto end;
2077
1065
}
2078
1066
2081
1069
/* (Mainly meant for debugging) */
2082
1070
char *address = strrchr(connect_to, ':');
2083
1071
if(address == NULL){
2084
fprintf(stderr, "Mandos plugin mandos-client: "
2085
"No colon in address\n");
2086
exitcode = EX_USAGE;
2087
goto end;
2088
}
2089
2090
if(quit_now){
2091
goto end;
2092
}
2093
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2094
1076
uint16_t port;
2095
errno = 0;
2096
tmpmax = strtoimax(address+1, &tmp, 10);
2097
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2098
or tmpmax != (uint16_t)tmpmax){
2099
fprintf(stderr, "Mandos plugin mandos-client: "
2100
"Bad port number\n");
2101
exitcode = EX_USAGE;
2102
goto end;
2103
}
2104
2105
if(quit_now){
2106
goto end;
2107
}
2108
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
2109
1084
port = (uint16_t)tmpmax;
2110
1085
*address = '\0';
2111
/* Colon in address indicates IPv6 */
2112
int af;
2113
if(strchr(connect_to, ':') != NULL){
2114
af = AF_INET6;
2115
/* Accept [] around IPv6 address - see RFC 5952 */
2116
if(connect_to[0] == '[' and address[-1] == ']')
2117
{
2118
connect_to++;
2119
address[-1] = '\0';
2120
}
2121
} else {
2122
af = AF_INET;
2123
}
2124
1086
address = connect_to;
2125
2126
if(quit_now){
2127
goto end;
2128
}
2129
2130
while(not quit_now){
2131
ret = start_mandos_communication(address, port, if_index, af);
2132
if(quit_now or ret == 0){
2133
break;
2134
}
2135
if(debug){
2136
fprintf(stderr, "Mandos plugin mandos-client: "
2137
"Retrying in %d seconds\n", (int)retry_interval);
2138
}
2139
sleep((int)retry_interval);
2140
}
2141
2142
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2143
1091
exitcode = EXIT_SUCCESS;
2144
1092
}
2145
2146
1093
goto end;
2147
1094
}
2148
1095
2149
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2150
1108
goto end;
2151
1109
}
2152
1110
2170
1128
2171
1129
/* Check if creating the Avahi server object succeeded */
2172
1130
if(mc.server == NULL){
2173
fprintf(stderr, "Mandos plugin mandos-client: "
2174
"Failed to create Avahi server: %s\n",
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
2175
1132
avahi_strerror(error));
2176
exitcode = EX_UNAVAILABLE;
2177
goto end;
2178
}
2179
2180
if(quit_now){
1133
exitcode = EXIT_FAILURE;
2181
1134
goto end;
2182
1135
}
2183
1136
2184
1137
/* Create the Avahi service browser */
2185
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2186
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2187
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2188
1141
if(sb == NULL){
2189
fprintf(stderr, "Mandos plugin mandos-client: "
2190
"Failed to create service browser: %s\n",
1142
fprintf(stderr, "Failed to create service browser: %s\n",
2191
1143
avahi_strerror(avahi_server_errno(mc.server)));
2192
exitcode = EX_UNAVAILABLE;
2193
goto end;
2194
}
2195
2196
if(quit_now){
1144
exitcode = EXIT_FAILURE;
2197
1145
goto end;
2198
1146
}
2199
1147
2200
1148
/* Run the main loop */
2201
1149
2202
1150
if(debug){
2203
fprintf(stderr, "Mandos plugin mandos-client: "
2204
"Starting Avahi loop search\n");
2205
}
2206
2207
ret = avahi_loop_with_timeout(mc.simple_poll,
2208
(int)(retry_interval * 1000));
2209
if(debug){
2210
fprintf(stderr, "Mandos plugin mandos-client: "
2211
"avahi_loop_with_timeout exited %s\n",
2212
(ret == 0) ? "successfully" : "with error");
2213
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2214
1155
2215
1156
end:
2216
1157
2217
1158
if(debug){
2218
fprintf(stderr, "Mandos plugin mandos-client: "
2219
"%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2220
1160
}
2221
1161
2222
1162
/* Cleanup things */
2238
1178
if(gpgme_initialized){
2239
1179
gpgme_release(mc.ctx);
2240
1180
}
2241
2242
/* Cleans up the circular linked list of Mandos servers the client
2243
has seen */
2244
if(mc.current_server != NULL){
2245
mc.current_server->prev->next = NULL;
2246
while(mc.current_server != NULL){
2247
server *next = mc.current_server->next;
2248
free(mc.current_server);
2249
mc.current_server = next;
2250
}
2251
}
2252
2253
/* Re-raise priviliges */
2254
{
2255
errno = 0;
2256
ret = seteuid(0);
2257
if(ret == -1){
2258
perror_plus("seteuid");
2259
}
2260
/* Run network hooks */
2261
if(not run_network_hooks("stop", interface, delay)){
2262
goto end;
2263
}
2264
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2268
if(ret == -1){
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2273
if(ret == -1){
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
}
2276
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2280
}
2281
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2289
2290
/* Removes the GPGME temp directory and all files inside */
1181
1182
/* Removes the temp directory used by GPGME */
2291
1183
if(tempdir_created){
2292
struct dirent **direntries = NULL;
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2295
alphasort);
2296
if (numentries > 0){
2297
for(int i = 0; i < numentries; i++){
2298
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2299
1204
char *fullname = NULL;
2300
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2301
1206
direntry->d_name);
2302
1207
if(ret < 0){
2303
perror_plus("asprintf");
1208
perror("asprintf");
2304
1209
continue;
2305
1210
}
2306
1211
ret = remove(fullname);
2307
1212
if(ret == -1){
2308
fprintf(stderr, "Mandos plugin mandos-client: "
2309
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2310
1215
}
2311
1216
free(fullname);
2312
1217
}
2313
}
2314
2315
/* need to clean even if 0 because man page doesn't specify */
2316
free(direntries);
2317
if (numentries == -1){
2318
perror_plus("scandir");
1218
closedir(d);
2319
1219
}
2320
1220
ret = rmdir(tempdir);
2321
1221
if(ret == -1 and errno != ENOENT){
2322
perror_plus("rmdir");
2323
}
2324
}
2325
2326
if(quit_now){
2327
sigemptyset(&old_sigterm_action.sa_mask);
2328
old_sigterm_action.sa_handler = SIG_DFL;
2329
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2330
&old_sigterm_action,
2331
NULL));
2332
if(ret == -1){
2333
perror_plus("sigaction");
2334
}
2335
do {
2336
ret = raise(signal_received);
2337
} while(ret != 0 and errno == EINTR);
2338
if(ret != 0){
2339
perror_plus("raise");
2340
abort();
2341
}
2342
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2343
1224
}
2344
1225
2345
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0