(root)/mandos/release
» Revision
237.16.8
(compared to revision 237.2.65)
: plugins.d/mandos-client.c
To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.16.8
- compare with another revision
- download diff
- download tarball
- view history from revision 237.16.8
- Committer: Teddy Hogeborn
- Date: 2011-11-14 20:11:42 UTC
- mto: (237.15.7 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111114201142-17zxc14jvonogwfx
* plugins.d/mandos-client.c (run_network_hooks): New.
(main): Run run_network_hooks() with "stop" and "start" at
appropriate places. Don't lower privileges permanently
prematurely.
(main): Run run_network_hooks() with "stop" and "start" at
appropriate places. Don't lower privileges permanently
prematurely.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
61
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
62
64
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
69
SIOCSIFFLAGS, if_indextoname(),
67
70
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
78
91
#ifdef __linux__
79
92
#include <sys/klog.h> /* klogctl() */
80
#endif
93
#endif /* __linux__ */
81
94
82
95
/* Avahi */
83
96
/* All Avahi types, constants and functions
97
110
init_gnutls_session(),
98
111
GNUTLS_* */
99
112
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
102
115
103
116
/* GPGME */
104
117
#include <gpgme.h> /* All GPGME types, constants and
112
125
#define PATHDIR "/conf/conf.d/mandos"
113
126
#define SECKEY "seckey.txt"
114
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
115
129
116
130
bool debug = false;
117
131
static const char mandos_protocol_version[] = "1";
118
132
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
120
148
121
149
/* Used for passing in values through the Avahi callback functions */
122
150
typedef struct {
127
155
gnutls_dh_params_t dh_params;
128
156
const char *priority;
129
157
gpgme_ctx_t ctx;
158
server *current_server;
130
159
} mandos_context;
131
160
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
132
177
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
* bytes. "buffer_capacity" is how much is currently allocated,
135
180
* "buffer_length" is how much is already used.
136
181
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
182
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
139
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
186
if(buffer == NULL){
146
191
return buffer_capacity;
147
192
}
148
193
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
149
231
/*
150
232
* Initialize GPGME.
151
233
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
155
236
gpgme_error_t rc;
156
237
gpgme_engine_info_t engine_info;
157
238
160
241
* Helper function to insert pub and seckey to the engine keyring.
161
242
*/
162
243
bool import_key(const char *filename){
244
int ret;
163
245
int fd;
164
246
gpgme_data_t pgp_data;
165
247
166
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
249
if(fd == -1){
168
perror("open");
250
perror_plus("open");
169
251
return false;
170
252
}
171
253
172
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
255
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
175
258
gpgme_strsource(rc), gpgme_strerror(rc));
176
259
return false;
177
260
}
178
261
179
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
180
263
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
182
266
gpgme_strsource(rc), gpgme_strerror(rc));
183
267
return false;
184
268
}
185
269
186
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
271
if(ret == -1){
188
perror("close");
272
perror_plus("close");
189
273
}
190
274
gpgme_data_release(pgp_data);
191
275
return true;
192
276
}
193
277
194
278
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
196
281
}
197
282
198
283
/* Init GPGME */
199
284
gpgme_check_version(NULL);
200
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
286
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
203
289
gpgme_strsource(rc), gpgme_strerror(rc));
204
290
return false;
205
291
}
206
292
207
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
208
294
rc = gpgme_get_engine_info(&engine_info);
209
295
if(rc != GPG_ERR_NO_ERROR){
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
211
298
gpgme_strsource(rc), gpgme_strerror(rc));
212
299
return false;
213
300
}
220
307
engine_info = engine_info->next;
221
308
}
222
309
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
224
312
return false;
225
313
}
226
314
227
315
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
229
317
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
232
321
return false;
233
322
}
234
323
236
325
return false;
237
326
}
238
327
239
return true;
328
return true;
240
329
}
241
330
242
331
/*
243
332
* Decrypt OpenPGP data.
244
333
* Returns -1 on error
245
334
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
336
size_t crypto_size,
249
337
char **plaintext){
250
338
gpgme_data_t dh_crypto, dh_plain;
254
342
ssize_t plaintext_length = 0;
255
343
256
344
if(debug){
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
258
347
}
259
348
260
349
/* Create new GPGME data buffer from memory cryptotext */
261
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
262
351
0);
263
352
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
265
355
gpgme_strsource(rc), gpgme_strerror(rc));
266
356
return -1;
267
357
}
269
359
/* Create new empty GPGME data buffer for the plaintext */
270
360
rc = gpgme_data_new(&dh_plain);
271
361
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
273
364
gpgme_strsource(rc), gpgme_strerror(rc));
274
365
gpgme_data_release(dh_crypto);
275
366
return -1;
277
368
278
369
/* Decrypt data from the cryptotext data buffer to the plaintext
279
370
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
372
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
283
375
gpgme_strsource(rc), gpgme_strerror(rc));
284
376
plaintext_length = -1;
285
377
if(debug){
286
378
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
288
380
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
290
383
} else {
291
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
292
386
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
294
389
result->wrong_key_usage);
295
390
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
297
393
}
298
394
gpgme_recipient_t recipient;
299
395
recipient = result->recipients;
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
}
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;
310
407
}
311
408
}
312
409
}
314
411
}
315
412
316
413
if(debug){
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
318
416
}
319
417
320
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
323
421
plaintext_length = -1;
324
422
goto decrypt_end;
325
423
}
326
424
327
425
*plaintext = NULL;
328
426
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
332
430
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
336
434
}
337
435
338
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
343
441
break;
344
442
}
345
443
if(ret < 0){
346
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
347
445
plaintext_length = -1;
348
446
goto decrypt_end;
349
447
}
351
449
}
352
450
353
451
if(debug){
354
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
355
454
for(ssize_t i = 0; i < plaintext_length; i++){
356
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
357
456
}
379
478
/* GnuTLS log function callback */
380
479
static void debuggnutls(__attribute__((unused)) int level,
381
480
const char* string){
382
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
383
482
}
384
483
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
484
static int init_gnutls_global(const char *pubkeyfilename,
387
485
const char *seckeyfilename){
388
486
int ret;
389
487
390
488
if(debug){
391
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
392
491
}
393
492
394
493
ret = gnutls_global_init();
395
494
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
398
497
return -1;
399
498
}
400
499
407
506
}
408
507
409
508
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
510
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
417
513
gnutls_global_deinit();
418
514
return -1;
419
515
}
420
516
421
517
if(debug){
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
423
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
521
seckeyfilename);
425
522
}
426
523
427
524
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
429
526
GNUTLS_OPENPGP_FMT_BASE64);
430
527
if(ret != GNUTLS_E_SUCCESS){
431
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
432
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
436
534
goto globalfail;
437
535
}
438
536
439
537
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
441
539
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
443
542
" %s\n", safer_gnutls_strerror(ret));
444
543
goto globalfail;
445
544
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
546
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
449
549
safer_gnutls_strerror(ret));
450
550
goto globalfail;
451
551
}
452
552
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
554
455
555
return 0;
456
556
457
557
globalfail:
458
558
459
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
460
560
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
462
562
return -1;
463
563
}
464
564
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
565
static int init_gnutls_session(gnutls_session_t *session){
467
566
int ret;
468
567
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
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);
470
574
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
472
577
safer_gnutls_strerror(ret));
473
578
}
474
579
475
580
{
476
581
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &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);
478
589
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
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));
482
594
gnutls_deinit(*session);
483
595
return -1;
484
596
}
485
597
}
486
598
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
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);
489
607
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
491
610
safer_gnutls_strerror(ret));
492
611
gnutls_deinit(*session);
493
612
return -1;
494
613
}
495
614
496
615
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
617
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
619
502
620
return 0;
503
621
}
509
627
/* Called when a Mandos server is found */
510
628
static int start_mandos_communication(const char *ip, uint16_t port,
511
629
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
630
int af){
631
int ret, tcp_sd = -1;
514
632
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
516
637
char *buffer = NULL;
517
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
518
639
size_t buffer_length = 0;
519
640
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
641
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
642
int retval = -1;
524
643
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &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);
527
668
if(ret != 0){
528
669
return -1;
529
670
}
530
671
531
672
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
533
675
"\n", ip, port);
534
676
}
535
677
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
537
679
if(tcp_sd < 0){
538
perror("socket");
539
return -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
540
684
}
541
685
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);
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
548
689
}
549
690
550
691
memset(&to, 0, sizeof(to));
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);
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
}
555
699
if(ret < 0 ){
556
perror("inet_pton");
557
return -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
558
704
}
559
705
if(ret == 0){
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
562
711
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
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
564
732
-Wconversion and
565
733
-Wunreachable-code */
734
}
566
735
567
to.in6.sin6_scope_id = (uint32_t)if_index;
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
568
740
569
741
if(debug){
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");
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");
576
767
} else {
577
768
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
579
771
}
580
772
}
581
773
}
582
774
583
ret = connect(tcp_sd, &to.in, sizeof(to));
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
}
584
785
if(ret < 0){
585
perror("connect");
586
return -1;
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;
587
797
}
588
798
589
799
const char *out = mandos_protocol_version;
591
801
while(true){
592
802
size_t out_size = strlen(out);
593
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
out_size - written));
804
out_size - written));
595
805
if(ret == -1){
596
perror("write");
597
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
598
809
goto mandos_end;
599
810
}
600
811
written += (size_t)ret;
608
819
break;
609
820
}
610
821
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
611
827
}
612
828
613
829
if(debug){
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
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 */
617
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
841
619
do{
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
620
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
621
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
854
623
855
if(ret != GNUTLS_E_SUCCESS){
624
856
if(debug){
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
626
859
gnutls_perror(ret);
627
860
}
628
retval = -1;
861
errno = EPROTO;
629
862
goto mandos_end;
630
863
}
631
864
632
865
/* Read OpenPGP packet that contains the wanted password */
633
866
634
867
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
637
870
}
638
871
639
872
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
642
881
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
645
890
goto mandos_end;
646
891
}
647
892
656
901
case GNUTLS_E_AGAIN:
657
902
break;
658
903
case GNUTLS_E_REHANDSHAKE:
659
do{
904
do {
660
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
661
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
912
if(ret < 0){
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
664
915
gnutls_perror(ret);
665
retval = -1;
916
errno = EPROTO;
666
917
goto mandos_end;
667
918
}
668
919
break;
669
920
default:
670
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
671
923
" encrypted session with Mandos server\n");
672
retval = -1;
673
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
674
926
goto mandos_end;
675
927
}
676
928
} else {
679
931
}
680
932
681
933
if(debug){
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
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);
686
950
687
951
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
690
954
&decrypted_buffer);
691
955
if(decrypted_buffer_size >= 0){
956
692
957
written = 0;
693
958
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
694
964
ret = (int)fwrite(decrypted_buffer + written, 1,
695
965
(size_t)decrypted_buffer_size - written,
696
966
stdout);
697
967
if(ret == 0 and ferror(stdout)){
968
int e = errno;
698
969
if(debug){
699
fprintf(stderr, "Error writing encrypted data: %s\n",
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
700
972
strerror(errno));
701
973
}
702
retval = -1;
703
break;
974
errno = e;
975
goto mandos_end;
704
976
}
705
977
written += (size_t)ret;
706
978
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
979
retval = 0;
710
980
}
711
} else {
712
retval = -1;
713
981
}
714
982
715
983
/* Shutdown procedure */
716
984
717
985
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
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
}
722
1005
}
723
gnutls_deinit(session);
724
1006
return retval;
725
1007
}
726
1008
727
1009
static void resolve_callback(AvahiSServiceResolver *r,
728
1010
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1011
AvahiProtocol proto,
730
1012
AvahiResolverEvent event,
731
1013
const char *name,
732
1014
const char *type,
737
1019
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
1020
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
1021
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
1022
AVAHI_GCC_UNUSED void* userdata){
742
1023
assert(r);
743
1024
744
1025
/* Called whenever a service has been resolved successfully or
745
1026
timed out */
746
1027
1028
if(quit_now){
1029
return;
1030
}
1031
747
1032
switch(event){
748
1033
default:
749
1034
case AVAHI_RESOLVER_FAILURE:
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
751
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1038
avahi_strerror(avahi_server_errno(mc.server)));
753
1039
break;
754
1040
755
1041
case AVAHI_RESOLVER_FOUND:
757
1043
char ip[AVAHI_ADDRESS_STR_MAX];
758
1044
avahi_address_snprint(ip, sizeof(ip), address);
759
1045
if(debug){
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
761
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
1049
ip, (intmax_t)interface, port);
763
1050
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
765
1053
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
767
1058
}
768
1059
}
769
1060
}
779
1070
const char *domain,
780
1071
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
1072
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
1073
AVAHI_GCC_UNUSED void* userdata){
784
1074
assert(b);
785
1075
786
1076
/* Called whenever a new services becomes available on the LAN or
787
1077
is removed from the LAN */
788
1078
1079
if(quit_now){
1080
return;
1081
}
1082
789
1083
switch(event){
790
1084
default:
791
1085
case AVAHI_BROWSER_FAILURE:
792
1086
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
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);
796
1091
return;
797
1092
798
1093
case AVAHI_BROWSER_NEW:
801
1096
the callback function is called the Avahi server will free the
802
1097
resolver for us. */
803
1098
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)));
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)));
810
1105
break;
811
1106
812
1107
case AVAHI_BROWSER_REMOVE:
815
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
816
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
817
1112
if(debug){
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
819
1115
}
820
1116
break;
821
1117
}
822
1118
}
823
1119
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
824
1514
int main(int argc, char *argv[]){
825
1515
AvahiSServiceBrowser *sb = NULL;
826
1516
int error;
827
1517
int ret;
828
1518
intmax_t tmpmax;
829
int numchars;
1519
char *tmp;
830
1520
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1521
const char *interface = "";
832
1522
struct ifreq network;
833
int sd;
1523
int sd = -1;
1524
bool take_down_interface = false;
834
1525
uid_t uid;
835
1526
gid_t gid;
836
char *connect_to = NULL;
837
1527
char tempdir[] = "/tmp/mandosXXXXXX";
838
1528
bool tempdir_created = false;
839
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1530
const char *seckey = PATHDIR "/" SECKEY;
841
1531
const char *pubkey = PATHDIR "/" PUBKEY;
842
1532
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1533
bool gnutls_initialized = false;
847
1534
bool gpgme_initialized = false;
848
double delay = 2.5;
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
}
849
1562
850
1563
{
851
1564
struct argp_option options[] = {
857
1570
.group = 1 },
858
1571
{ .name = "interface", .key = 'i',
859
1572
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1573
.doc = "Network interface that will be used to search for"
1574
" Mandos servers",
862
1575
.group = 1 },
863
1576
{ .name = "seckey", .key = 's',
864
1577
.arg = "FILE",
881
1594
.arg = "SECONDS",
882
1595
.doc = "Maximum delay to wait for interface startup",
883
1596
.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 },
884
1614
{ .name = NULL }
885
1615
};
886
1616
887
1617
error_t parse_opt(int key, char *arg,
888
1618
struct argp_state *state){
1619
errno = 0;
889
1620
switch(key){
890
1621
case 128: /* --debug */
891
1622
debug = true;
903
1634
pubkey = arg;
904
1635
break;
905
1636
case 129: /* --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);
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");
911
1642
}
912
1643
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
1644
break;
915
1646
mc.priority = arg;
916
1647
break;
917
1648
case 131: /* --delay */
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:
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);
927
1680
break;
928
1681
default:
929
1682
return ARGP_ERR_UNKNOWN;
930
1683
}
931
return 0;
1684
return errno;
932
1685
}
933
1686
934
1687
struct argp argp = { .options = options, .parser = parse_opt,
935
1688
.args_doc = "",
936
1689
.doc = "Mandos client -- Get and decrypt"
937
1690
" passwords from a Mandos server" };
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");
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");
941
1820
exitcode = EXIT_FAILURE;
942
1821
goto end;
943
1822
}
944
1823
}
945
1824
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
946
1900
/* If the interface is down, bring it up */
947
{
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
948
1921
#ifdef __linux__
949
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1923
messages about the network interface to mess up the prompt */
951
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
952
1926
if(ret == -1){
953
perror("klogctl");
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
954
1929
}
955
#endif
1930
#endif /* __linux__ */
956
1931
957
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
1933
if(sd < 0){
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
961
1936
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
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);
963
1947
if(ret == -1){
964
perror("klogctl");
1948
perror_plus("seteuid");
965
1949
}
966
#endif
967
1950
goto end;
968
1951
}
969
1952
strcpy(network.ifr_name, interface);
970
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
971
1954
if(ret == -1){
972
perror("ioctl SIOCGIFFLAGS");
1955
perror_plus("ioctl SIOCGIFFLAGS");
973
1956
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
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);
975
1968
if(ret == -1){
976
perror("klogctl");
1969
perror_plus("seteuid");
977
1970
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
1971
goto end;
981
1972
}
982
1973
if((network.ifr_flags & IFF_UP) == 0){
983
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
984
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
1977
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
988
1981
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
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);
990
1992
if(ret == -1){
991
perror("klogctl");
1993
perror_plus("seteuid");
992
1994
}
993
#endif
994
1995
goto end;
995
1996
}
996
1997
}
997
/* sleep checking until interface is running */
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
998
2000
for(int i=0; i < delay * 4; i++){
999
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1000
2002
if(ret == -1){
1001
perror("ioctl SIOCGIFFLAGS");
2003
perror_plus("ioctl SIOCGIFFLAGS");
1002
2004
} else if(network.ifr_flags & IFF_RUNNING){
1003
2005
break;
1004
2006
}
1005
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
2008
ret = nanosleep(&sleeptime, NULL);
1007
2009
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
2010
perror_plus("nanosleep");
1009
2011
}
1010
2012
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
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
}
1014
2019
}
1015
2020
#ifdef __linux__
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
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);
1018
2033
if(ret == -1){
1019
perror("klogctl");
2034
perror_plus("seteuid");
1020
2035
}
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;
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;
1041
2047
goto end;
1042
2048
} else {
1043
2049
gnutls_initialized = true;
1044
2050
}
1045
2051
2052
if(quit_now){
2053
goto end;
2054
}
2055
1046
2056
if(mkdtemp(tempdir) == NULL){
1047
perror("mkdtemp");
2057
perror_plus("mkdtemp");
1048
2058
goto end;
1049
2059
}
1050
2060
tempdir_created = true;
1051
2061
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
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;
1055
2070
goto end;
1056
2071
} else {
1057
2072
gpgme_initialized = true;
1058
2073
}
1059
2074
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;
2075
if(quit_now){
1064
2076
goto end;
1065
2077
}
1066
2078
1069
2081
/* (Mainly meant for debugging) */
1070
2082
char *address = strrchr(connect_to, ':');
1071
2083
if(address == NULL){
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
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
1076
2094
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
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
1084
2109
port = (uint16_t)tmpmax;
1085
2110
*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
}
1086
2124
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
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){
1091
2143
exitcode = EXIT_SUCCESS;
1092
2144
}
2145
1093
2146
goto end;
1094
2147
}
1095
2148
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;
2149
if(quit_now){
1108
2150
goto end;
1109
2151
}
1110
2152
1128
2170
1129
2171
/* Check if creating the Avahi server object succeeded */
1130
2172
if(mc.server == NULL){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
2173
fprintf(stderr, "Mandos plugin mandos-client: "
2174
"Failed to create Avahi server: %s\n",
1132
2175
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2176
exitcode = EX_UNAVAILABLE;
2177
goto end;
2178
}
2179
2180
if(quit_now){
1134
2181
goto end;
1135
2182
}
1136
2183
1137
2184
/* Create the Avahi service browser */
1138
2185
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2186
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2187
NULL, 0, browse_callback, NULL);
1141
2188
if(sb == NULL){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
2189
fprintf(stderr, "Mandos plugin mandos-client: "
2190
"Failed to create service browser: %s\n",
1143
2191
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2192
exitcode = EX_UNAVAILABLE;
2193
goto end;
2194
}
2195
2196
if(quit_now){
1145
2197
goto end;
1146
2198
}
1147
2199
1148
2200
/* Run the main loop */
1149
2201
1150
2202
if(debug){
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
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
}
1155
2214
1156
2215
end:
1157
2216
1158
2217
if(debug){
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2218
fprintf(stderr, "Mandos plugin mandos-client: "
2219
"%s exiting\n", argv[0]);
1160
2220
}
1161
2221
1162
2222
/* Cleanup things */
1178
2238
if(gpgme_initialized){
1179
2239
gpgme_release(mc.ctx);
1180
2240
}
1181
1182
/* Removes the temp directory used by GPGME */
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 */
1183
2291
if(tempdir_created){
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
}
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];
1204
2299
char *fullname = NULL;
1205
2300
ret = asprintf(&fullname, "%s/%s", tempdir,
1206
2301
direntry->d_name);
1207
2302
if(ret < 0){
1208
perror("asprintf");
2303
perror_plus("asprintf");
1209
2304
continue;
1210
2305
}
1211
2306
ret = remove(fullname);
1212
2307
if(ret == -1){
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2308
fprintf(stderr, "Mandos plugin mandos-client: "
2309
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1215
2310
}
1216
2311
free(fullname);
1217
2312
}
1218
closedir(d);
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");
1219
2319
}
1220
2320
ret = rmdir(tempdir);
1221
2321
if(ret == -1 and errno != ENOENT){
1222
perror("rmdir");
1223
}
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());
1224
2343
}
1225
2344
1226
2345
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0