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- 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
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,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
183
138
size_t buffer_capacity){
184
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
232
149
/*
233
150
* Initialize GPGME.
234
151
*/
235
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
236
153
const char *pubkey, const char *tempdir){
154
int ret;
237
155
gpgme_error_t rc;
238
156
gpgme_engine_info_t engine_info;
239
157
242
160
* Helper function to insert pub and seckey to the engine keyring.
243
161
*/
244
162
bool import_key(const char *filename){
245
int ret;
246
163
int fd;
247
164
gpgme_data_t pgp_data;
248
165
249
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
250
167
if(fd == -1){
251
perror_plus("open");
168
perror("open");
252
169
return false;
253
170
}
254
171
255
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
173
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
259
175
gpgme_strsource(rc), gpgme_strerror(rc));
260
176
return false;
261
177
}
262
178
263
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
264
180
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
267
182
gpgme_strsource(rc), gpgme_strerror(rc));
268
183
return false;
269
184
}
270
185
271
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
272
187
if(ret == -1){
273
perror_plus("close");
188
perror("close");
274
189
}
275
190
gpgme_data_release(pgp_data);
276
191
return true;
277
192
}
278
193
279
194
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
282
196
}
283
197
284
198
/* Init GPGME */
285
199
gpgme_check_version(NULL);
286
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
201
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
290
203
gpgme_strsource(rc), gpgme_strerror(rc));
291
204
return false;
292
205
}
293
206
294
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
295
208
rc = gpgme_get_engine_info(&engine_info);
296
209
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
211
gpgme_strsource(rc), gpgme_strerror(rc));
300
212
return false;
301
213
}
308
220
engine_info = engine_info->next;
309
221
}
310
222
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
313
224
return false;
314
225
}
315
226
316
227
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
318
229
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
322
232
return false;
323
233
}
324
234
326
236
return false;
327
237
}
328
238
329
return true;
239
return true;
330
240
}
331
241
332
242
/*
333
243
* Decrypt OpenPGP data.
334
244
* Returns -1 on error
335
245
*/
336
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
337
248
size_t crypto_size,
338
249
char **plaintext){
339
250
gpgme_data_t dh_crypto, dh_plain;
343
254
ssize_t plaintext_length = 0;
344
255
345
256
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
258
}
349
259
350
260
/* Create new GPGME data buffer from memory cryptotext */
351
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
262
0);
353
263
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
356
265
gpgme_strsource(rc), gpgme_strerror(rc));
357
266
return -1;
358
267
}
360
269
/* Create new empty GPGME data buffer for the plaintext */
361
270
rc = gpgme_data_new(&dh_plain);
362
271
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
365
273
gpgme_strsource(rc), gpgme_strerror(rc));
366
274
gpgme_data_release(dh_crypto);
367
275
return -1;
369
277
370
278
/* Decrypt data from the cryptotext data buffer to the plaintext
371
279
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
281
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
283
gpgme_strsource(rc), gpgme_strerror(rc));
377
284
plaintext_length = -1;
378
285
if(debug){
379
286
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
381
288
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
290
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
291
fprintf(stderr, "Unsupported algorithm: %s\n",
387
292
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
293
fprintf(stderr, "Wrong key usage: %u\n",
390
294
result->wrong_key_usage);
391
295
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
394
297
}
395
298
gpgme_recipient_t recipient;
396
299
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
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
}
408
310
}
409
311
}
410
312
}
412
314
}
413
315
414
316
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
318
}
418
319
419
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
422
323
plaintext_length = -1;
423
324
goto decrypt_end;
424
325
}
425
326
426
327
*plaintext = NULL;
427
328
while(true){
428
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
429
330
(size_t)plaintext_length,
430
331
plaintext_capacity);
431
332
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
333
perror("adjustbuffer");
433
334
plaintext_length = -1;
434
335
goto decrypt_end;
435
336
}
442
343
break;
443
344
}
444
345
if(ret < 0){
445
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
446
347
plaintext_length = -1;
447
348
goto decrypt_end;
448
349
}
450
351
}
451
352
452
353
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
455
355
for(ssize_t i = 0; i < plaintext_length; i++){
456
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
357
}
479
379
/* GnuTLS log function callback */
480
380
static void debuggnutls(__attribute__((unused)) int level,
481
381
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
483
383
}
484
384
485
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
486
387
const char *seckeyfilename){
487
388
int ret;
488
389
489
390
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
492
392
}
493
393
494
394
ret = gnutls_global_init();
495
395
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
498
398
return -1;
499
399
}
500
400
507
407
}
508
408
509
409
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
511
411
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"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));
514
417
gnutls_global_deinit();
515
418
return -1;
516
419
}
517
420
518
421
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
521
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
424
seckeyfilename);
523
425
}
524
426
525
427
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
527
429
GNUTLS_OPENPGP_FMT_BASE64);
528
430
if(ret != GNUTLS_E_SUCCESS){
529
431
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
535
436
goto globalfail;
536
437
}
537
438
538
439
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
540
441
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
543
443
" %s\n", safer_gnutls_strerror(ret));
544
444
goto globalfail;
545
445
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
447
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
550
449
safer_gnutls_strerror(ret));
551
450
goto globalfail;
552
451
}
553
452
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
454
556
455
return 0;
557
456
558
457
globalfail:
559
458
560
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
561
460
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
563
462
return -1;
564
463
}
565
464
566
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
567
467
int ret;
568
468
/* GnuTLS session creation */
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
575
470
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
578
472
safer_gnutls_strerror(ret));
579
473
}
580
474
581
475
{
582
476
const char *err;
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
590
478
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"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));
595
482
gnutls_deinit(*session);
596
483
return -1;
597
484
}
598
485
}
599
486
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
608
489
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
611
491
safer_gnutls_strerror(ret));
612
492
gnutls_deinit(*session);
613
493
return -1;
614
494
}
615
495
616
496
/* ignore client certificate if any. */
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
618
499
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
620
501
621
502
return 0;
622
503
}
628
509
/* Called when a Mandos server is found */
629
510
static int start_mandos_communication(const char *ip, uint16_t port,
630
511
AvahiIfIndex if_index,
631
int af){
632
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
633
514
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
638
516
char *buffer = NULL;
639
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
640
518
size_t buffer_length = 0;
641
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
642
521
size_t written;
643
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
644
524
gnutls_session_t session;
645
int pf; /* Protocol family */
646
647
errno = 0;
648
649
if(quit_now){
650
errno = EINTR;
651
return -1;
652
}
653
654
switch(af){
655
case AF_INET6:
656
pf = PF_INET6;
657
break;
658
case AF_INET:
659
pf = PF_INET;
660
break;
661
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
665
return -1;
666
}
667
668
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
669
527
if(ret != 0){
670
528
return -1;
671
529
}
672
530
673
531
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
676
533
"\n", ip, port);
677
534
}
678
535
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
680
537
if(tcp_sd < 0){
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
684
goto mandos_end;
538
perror("socket");
539
return -1;
685
540
}
686
541
687
if(quit_now){
688
errno = EINTR;
689
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);
690
548
}
691
549
692
550
memset(&to, 0, sizeof(to));
693
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
696
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
699
}
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);
700
555
if(ret < 0 ){
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
704
goto mandos_end;
556
perror("inet_pton");
557
return -1;
705
558
}
706
559
if(ret == 0){
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
711
goto mandos_end;
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
712
562
}
713
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
721
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
725
errno = EINVAL;
726
goto mandos_end;
727
}
728
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
730
}
731
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
733
564
-Wconversion and
734
565
-Wunreachable-code */
735
}
736
566
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
741
568
742
569
if(debug){
743
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
744
char interface[IF_NAMESIZE];
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
perror_plus("if_indextoname");
747
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
751
}
752
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
755
}
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
766
if(pcret == NULL){
767
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");
768
576
} else {
769
577
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
772
579
}
773
580
}
774
581
}
775
582
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
786
584
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
585
perror("connect");
586
return -1;
798
587
}
799
588
800
589
const char *out = mandos_protocol_version;
804
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
594
out_size - written));
806
595
if(ret == -1){
807
int e = errno;
808
perror_plus("write");
809
errno = e;
596
perror("write");
597
retval = -1;
810
598
goto mandos_end;
811
599
}
812
600
written += (size_t)ret;
820
608
break;
821
609
}
822
610
}
823
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
611
}
829
612
830
613
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
833
}
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
/* Spurious warning from -Wint-to-pointer-cast */
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
841
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
842
618
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
848
do {
619
do{
849
620
ret = gnutls_handshake(session);
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
855
622
856
623
if(ret != GNUTLS_E_SUCCESS){
857
624
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
860
626
gnutls_perror(ret);
861
627
}
862
errno = EPROTO;
628
retval = -1;
863
629
goto mandos_end;
864
630
}
865
631
866
632
/* Read OpenPGP packet that contains the wanted password */
867
633
868
634
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
871
637
}
872
638
873
639
while(true){
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
879
880
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
881
641
buffer_capacity);
882
642
if(buffer_capacity == 0){
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
886
goto mandos_end;
887
}
888
889
if(quit_now){
890
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
891
645
goto mandos_end;
892
646
}
893
647
902
656
case GNUTLS_E_AGAIN:
903
657
break;
904
658
case GNUTLS_E_REHANDSHAKE:
905
do {
659
do{
906
660
ret = gnutls_handshake(session);
907
908
if(quit_now){
909
errno = EINTR;
910
goto mandos_end;
911
}
912
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
662
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
916
664
gnutls_perror(ret);
917
errno = EPROTO;
665
retval = -1;
918
666
goto mandos_end;
919
667
}
920
668
break;
921
669
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
670
fprintf(stderr, "Unknown error while reading data from"
924
671
" encrypted session with Mandos server\n");
672
retval = -1;
925
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
927
674
goto mandos_end;
928
675
}
929
676
} else {
932
679
}
933
680
934
681
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} 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);
951
686
952
687
if(buffer_length > 0){
953
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
955
689
buffer_length,
956
690
&decrypted_buffer);
957
691
if(decrypted_buffer_size >= 0){
958
959
692
written = 0;
960
693
while(written < (size_t) decrypted_buffer_size){
961
if(quit_now){
962
errno = EINTR;
963
goto mandos_end;
964
}
965
966
694
ret = (int)fwrite(decrypted_buffer + written, 1,
967
695
(size_t)decrypted_buffer_size - written,
968
696
stdout);
969
697
if(ret == 0 and ferror(stdout)){
970
int e = errno;
971
698
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
699
fprintf(stderr, "Error writing encrypted data: %s\n",
974
700
strerror(errno));
975
701
}
976
errno = e;
977
goto mandos_end;
702
retval = -1;
703
break;
978
704
}
979
705
written += (size_t)ret;
980
706
}
981
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
982
710
}
711
} else {
712
retval = -1;
983
713
}
984
714
985
715
/* Shutdown procedure */
986
716
987
717
mandos_end:
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
1007
722
}
723
gnutls_deinit(session);
1008
724
return retval;
1009
725
}
1010
726
1011
727
static void resolve_callback(AvahiSServiceResolver *r,
1012
728
AvahiIfIndex interface,
1013
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1014
730
AvahiResolverEvent event,
1015
731
const char *name,
1016
732
const char *type,
1021
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
739
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
1025
742
assert(r);
1026
743
1027
744
/* Called whenever a service has been resolved successfully or
1028
745
timed out */
1029
746
1030
if(quit_now){
1031
return;
1032
}
1033
1034
747
switch(event){
1035
748
default:
1036
749
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1039
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
1041
753
break;
1042
754
1043
755
case AVAHI_RESOLVER_FOUND:
1045
757
char ip[AVAHI_ADDRESS_STR_MAX];
1046
758
avahi_address_snprint(ip, sizeof(ip), address);
1047
759
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1050
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
762
ip, (intmax_t)interface, port);
1052
763
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1055
765
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
766
avahi_simple_poll_quit(mc->simple_poll);
1060
767
}
1061
768
}
1062
769
}
1072
779
const char *domain,
1073
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
781
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1076
784
assert(b);
1077
785
1078
786
/* Called whenever a new services becomes available on the LAN or
1079
787
is removed from the LAN */
1080
788
1081
if(quit_now){
1082
return;
1083
}
1084
1085
789
switch(event){
1086
790
default:
1087
791
case AVAHI_BROWSER_FAILURE:
1088
792
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
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);
1093
796
return;
1094
797
1095
798
case AVAHI_BROWSER_NEW:
1098
801
the callback function is called the Avahi server will free the
1099
802
resolver for us. */
1100
803
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
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)));
1107
810
break;
1108
811
1109
812
case AVAHI_BROWSER_REMOVE:
1112
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
817
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1117
819
}
1118
820
break;
1119
821
}
1120
822
}
1121
823
1122
/* Signal handler that stops main loop after SIGTERM */
1123
static void handle_sigterm(int sig){
1124
if(quit_now){
1125
return;
1126
}
1127
quit_now = 1;
1128
signal_received = sig;
1129
int old_errno = errno;
1130
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1133
}
1134
errno = old_errno;
1135
}
1136
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
1407
824
int main(int argc, char *argv[]){
1408
825
AvahiSServiceBrowser *sb = NULL;
1409
826
int error;
1410
827
int ret;
1411
828
intmax_t tmpmax;
1412
char *tmp;
829
int numchars;
1413
830
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
831
const char *interface = "eth0";
1415
832
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
833
int sd;
1418
834
uid_t uid;
1419
835
gid_t gid;
836
char *connect_to = NULL;
1420
837
char tempdir[] = "/tmp/mandosXXXXXX";
1421
838
bool tempdir_created = false;
1422
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
840
const char *seckey = PATHDIR "/" SECKEY;
1424
841
const char *pubkey = PATHDIR "/" PUBKEY;
1425
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1426
846
bool gnutls_initialized = false;
1427
847
bool gpgme_initialized = false;
1428
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
1431
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1434
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
848
double delay = 2.5;
1455
849
1456
850
{
1457
851
struct argp_option options[] = {
1463
857
.group = 1 },
1464
858
{ .name = "interface", .key = 'i',
1465
859
.arg = "NAME",
1466
.doc = "Network interface that will be used to search for"
1467
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1468
862
.group = 1 },
1469
863
{ .name = "seckey", .key = 's',
1470
864
.arg = "FILE",
1487
881
.arg = "SECONDS",
1488
882
.doc = "Maximum delay to wait for interface startup",
1489
883
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
1507
884
{ .name = NULL }
1508
885
};
1509
886
1510
887
error_t parse_opt(int key, char *arg,
1511
888
struct argp_state *state){
1512
errno = 0;
1513
889
switch(key){
1514
890
case 128: /* --debug */
1515
891
debug = true;
1527
903
pubkey = arg;
1528
904
break;
1529
905
case 129: /* --dh-bits */
1530
errno = 0;
1531
tmpmax = strtoimax(arg, &tmp, 10);
1532
if(errno != 0 or tmp == arg or *tmp != '\0'
1533
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1534
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);
1535
911
}
1536
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
913
break;
1539
915
mc.priority = arg;
1540
916
break;
1541
917
case 131: /* --delay */
1542
errno = 0;
1543
delay = strtof(arg, &tmp);
1544
if(errno != 0 or tmp == arg or *tmp != '\0'){
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
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:
1573
927
break;
1574
928
default:
1575
929
return ARGP_ERR_UNKNOWN;
1576
930
}
1577
return errno;
931
return 0;
1578
932
}
1579
933
1580
934
struct argp argp = { .options = options, .parser = parse_opt,
1581
935
.args_doc = "",
1582
936
.doc = "Mandos client -- Get and decrypt"
1583
937
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
1753
}
1754
1755
if(not debug){
1756
avahi_set_log_function(empty_log);
1757
}
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"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");
1788
941
exitcode = EXIT_FAILURE;
1789
942
goto end;
1790
943
}
1791
944
}
1792
945
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
from the signal handler */
1795
/* Initialize the pseudo-RNG for Avahi */
1796
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1802
goto end;
1803
}
1804
1805
sigemptyset(&sigterm_action.sa_mask);
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1807
if(ret == -1){
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1810
goto end;
1811
}
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1813
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1816
goto end;
1817
}
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1819
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1822
goto end;
1823
}
1824
/* Need to check if the handler is SIG_IGN before handling:
1825
| [[info:libc:Initial Signal Actions]] |
1826
| [[info:libc:Basic Signal Handling]] |
1827
*/
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1829
if(ret == -1){
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1832
}
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1838
goto end;
1839
}
1840
}
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1842
if(ret == -1){
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1845
}
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1851
goto end;
1852
}
1853
}
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1855
if(ret == -1){
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1858
}
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1864
goto end;
1865
}
1866
}
1867
1868
946
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
947
{
1889
948
#ifdef __linux__
1890
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1892
951
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
952
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
953
perror("klogctl");
1897
954
}
1898
#endif /* __linux__ */
955
#endif
1899
956
1900
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
958
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1904
961
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1915
963
if(ret == -1){
1916
perror_plus("seteuid");
964
perror("klogctl");
1917
965
}
966
#endif
1918
967
goto end;
1919
968
}
1920
969
strcpy(network.ifr_name, interface);
1921
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
971
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1924
973
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1936
975
if(ret == -1){
1937
perror_plus("seteuid");
976
perror("klogctl");
1938
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1939
980
goto end;
1940
981
}
1941
982
if((network.ifr_flags & IFF_UP) == 0){
1942
983
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
985
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1949
988
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
1954
}
1955
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1960
990
if(ret == -1){
1961
perror_plus("seteuid");
991
perror("klogctl");
1962
992
}
993
#endif
1963
994
goto end;
1964
995
}
1965
996
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1968
998
for(int i=0; i < delay * 4; i++){
1969
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
1000
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1972
1002
} else if(network.ifr_flags & IFF_RUNNING){
1973
1003
break;
1974
1004
}
1975
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
1006
ret = nanosleep(&sleeptime, NULL);
1977
1007
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1008
perror("nanosleep");
1979
1009
}
1980
1010
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1987
1014
}
1988
1015
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
ret = init_gnutls_global(pubkey, seckey);
2019
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2023
1041
goto end;
2024
1042
} else {
2025
1043
gnutls_initialized = true;
2026
1044
}
2027
1045
2028
if(quit_now){
2029
goto end;
2030
}
2031
2032
1046
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2034
1048
goto end;
2035
1049
}
2036
1050
tempdir_created = true;
2037
1051
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2046
1055
goto end;
2047
1056
} else {
2048
1057
gpgme_initialized = true;
2049
1058
}
2050
1059
2051
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;
2052
1064
goto end;
2053
1065
}
2054
1066
2057
1069
/* (Mainly meant for debugging) */
2058
1070
char *address = strrchr(connect_to, ':');
2059
1071
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2070
1076
uint16_t port;
2071
errno = 0;
2072
tmpmax = strtoimax(address+1, &tmp, 10);
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
2078
goto end;
2079
}
2080
2081
if(quit_now){
2082
goto end;
2083
}
2084
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
}
2085
1084
port = (uint16_t)tmpmax;
2086
1085
*address = '\0';
2087
/* Colon in address indicates IPv6 */
2088
int af;
2089
if(strchr(connect_to, ':') != NULL){
2090
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
2097
} else {
2098
af = AF_INET;
2099
}
2100
1086
address = connect_to;
2101
2102
if(quit_now){
2103
goto end;
2104
}
2105
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2119
1091
exitcode = EXIT_SUCCESS;
2120
1092
}
2121
2122
1093
goto end;
2123
1094
}
2124
1095
2125
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;
2126
1108
goto end;
2127
1109
}
2128
1110
2146
1128
2147
1129
/* Check if creating the Avahi server object succeeded */
2148
1130
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
2151
1132
avahi_strerror(error));
2152
exitcode = EX_UNAVAILABLE;
2153
goto end;
2154
}
2155
2156
if(quit_now){
1133
exitcode = EXIT_FAILURE;
2157
1134
goto end;
2158
1135
}
2159
1136
2160
1137
/* Create the Avahi service browser */
2161
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2164
1141
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1142
fprintf(stderr, "Failed to create service browser: %s\n",
2167
1143
avahi_strerror(avahi_server_errno(mc.server)));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
1144
exitcode = EXIT_FAILURE;
2173
1145
goto end;
2174
1146
}
2175
1147
2176
1148
/* Run the main loop */
2177
1149
2178
1150
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2190
1155
2191
1156
end:
2192
1157
2193
1158
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1160
}
2197
1161
2198
1162
/* Cleanup things */
2214
1178
if(gpgme_initialized){
2215
1179
gpgme_release(mc.ctx);
2216
1180
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
2261
}
2262
2263
/* Removes the GPGME temp directory and all files inside */
1181
1182
/* Removes the temp directory used by GPGME */
2264
1183
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
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
}
2272
1204
char *fullname = NULL;
2273
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
1206
direntry->d_name);
2275
1207
if(ret < 0){
2276
perror_plus("asprintf");
1208
perror("asprintf");
2277
1209
continue;
2278
1210
}
2279
1211
ret = remove(fullname);
2280
1212
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2283
1215
}
2284
1216
free(fullname);
2285
1217
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1218
closedir(d);
2292
1219
}
2293
1220
ret = rmdir(tempdir);
2294
1221
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
2297
}
2298
2299
if(quit_now){
2300
sigemptyset(&old_sigterm_action.sa_mask);
2301
old_sigterm_action.sa_handler = SIG_DFL;
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
2305
if(ret == -1){
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2316
1224
}
2317
1225
2318
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0