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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 343.
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- 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() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#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() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#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() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
110
105
init_gnutls_session(),
111
106
GNUTLS_* */
112
107
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
115
110
116
111
/* GPGME */
117
112
#include <gpgme.h> /* All GPGME types, constants and
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.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
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
176
144
177
145
/*
178
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
180
148
* "buffer_length" is how much is already used.
181
149
*/
182
150
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
151
size_t buffer_capacity){
184
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
154
if(buffer == NULL){
191
159
return buffer_capacity;
192
160
}
193
161
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
162
/*
232
163
* Initialize GPGME.
233
164
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
236
168
gpgme_error_t rc;
237
169
gpgme_engine_info_t engine_info;
238
170
241
173
* Helper function to insert pub and seckey to the engine keyring.
242
174
*/
243
175
bool import_key(const char *filename){
244
int ret;
245
176
int fd;
246
177
gpgme_data_t pgp_data;
247
178
248
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
180
if(fd == -1){
250
perror_plus("open");
181
perror("open");
251
182
return false;
252
183
}
253
184
254
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
186
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
188
gpgme_strsource(rc), gpgme_strerror(rc));
259
189
return false;
260
190
}
261
191
262
192
rc = gpgme_op_import(mc.ctx, pgp_data);
263
193
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
195
gpgme_strsource(rc), gpgme_strerror(rc));
267
196
return false;
268
197
}
269
198
270
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
200
if(ret == -1){
272
perror_plus("close");
201
perror("close");
273
202
}
274
203
gpgme_data_release(pgp_data);
275
204
return true;
276
205
}
277
206
278
207
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
281
209
}
282
210
283
211
/* Init GPGME */
284
212
gpgme_check_version(NULL);
285
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
214
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
216
gpgme_strsource(rc), gpgme_strerror(rc));
290
217
return false;
291
218
}
292
219
293
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
294
221
rc = gpgme_get_engine_info(&engine_info);
295
222
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
224
gpgme_strsource(rc), gpgme_strerror(rc));
299
225
return false;
300
226
}
307
233
engine_info = engine_info->next;
308
234
}
309
235
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
237
return false;
313
238
}
314
239
315
240
/* Create new GPGME "context" */
316
241
rc = gpgme_new(&(mc.ctx));
317
242
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
321
245
return false;
322
246
}
323
247
325
249
return false;
326
250
}
327
251
328
return true;
252
return true;
329
253
}
330
254
331
255
/*
342
266
ssize_t plaintext_length = 0;
343
267
344
268
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
270
}
348
271
349
272
/* Create new GPGME data buffer from memory cryptotext */
350
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
274
0);
352
275
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
277
gpgme_strsource(rc), gpgme_strerror(rc));
356
278
return -1;
357
279
}
359
281
/* Create new empty GPGME data buffer for the plaintext */
360
282
rc = gpgme_data_new(&dh_plain);
361
283
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
285
gpgme_strsource(rc), gpgme_strerror(rc));
365
286
gpgme_data_release(dh_crypto);
366
287
return -1;
370
291
data buffer */
371
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
293
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
295
gpgme_strsource(rc), gpgme_strerror(rc));
376
296
plaintext_length = -1;
377
297
if(debug){
378
298
gpgme_decrypt_result_t result;
379
299
result = gpgme_op_decrypt_result(mc.ctx);
380
300
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
302
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
303
fprintf(stderr, "Unsupported algorithm: %s\n",
386
304
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
305
fprintf(stderr, "Wrong key usage: %u\n",
389
306
result->wrong_key_usage);
390
307
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
393
309
}
394
310
gpgme_recipient_t recipient;
395
311
recipient = result->recipients;
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
407
322
}
408
323
}
409
324
}
411
326
}
412
327
413
328
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
330
}
417
331
418
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
421
335
plaintext_length = -1;
422
336
goto decrypt_end;
423
337
}
425
339
*plaintext = NULL;
426
340
while(true){
427
341
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
430
344
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
434
348
}
435
349
436
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
355
break;
442
356
}
443
357
if(ret < 0){
444
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
445
359
plaintext_length = -1;
446
360
goto decrypt_end;
447
361
}
449
363
}
450
364
451
365
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
454
367
for(ssize_t i = 0; i < plaintext_length; i++){
455
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
369
}
478
391
/* GnuTLS log function callback */
479
392
static void debuggnutls(__attribute__((unused)) int level,
480
393
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
482
395
}
483
396
484
397
static int init_gnutls_global(const char *pubkeyfilename,
486
399
int ret;
487
400
488
401
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
491
403
}
492
404
493
405
ret = gnutls_global_init();
494
406
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
497
409
return -1;
498
410
}
499
411
506
418
}
507
419
508
420
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
510
422
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
513
428
gnutls_global_deinit();
514
429
return -1;
515
430
}
516
431
517
432
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
435
seckeyfilename);
522
436
}
526
440
GNUTLS_OPENPGP_FMT_BASE64);
527
441
if(ret != GNUTLS_E_SUCCESS){
528
442
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
534
447
goto globalfail;
535
448
}
536
449
537
450
/* GnuTLS server initialization */
538
451
ret = gnutls_dh_params_init(&mc.dh_params);
539
452
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
454
" %s\n", safer_gnutls_strerror(ret));
543
455
goto globalfail;
544
456
}
545
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
458
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
460
safer_gnutls_strerror(ret));
550
461
goto globalfail;
551
462
}
565
476
static int init_gnutls_session(gnutls_session_t *session){
566
477
int ret;
567
478
/* GnuTLS session creation */
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
574
480
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
482
safer_gnutls_strerror(ret));
578
483
}
579
484
580
485
{
581
486
const char *err;
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
488
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
594
492
gnutls_deinit(*session);
595
493
return -1;
596
494
}
597
495
}
598
496
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);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
607
499
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
501
safer_gnutls_strerror(ret));
611
502
gnutls_deinit(*session);
612
503
return -1;
613
504
}
614
505
615
506
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
617
509
618
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
511
628
520
static int start_mandos_communication(const char *ip, uint16_t port,
629
521
AvahiIfIndex if_index,
630
522
int af){
631
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
632
524
ssize_t sret;
633
525
union {
634
526
struct sockaddr_in in;
635
527
struct sockaddr_in6 in6;
636
528
} to;
637
529
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
639
531
size_t buffer_length = 0;
640
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
641
534
size_t written;
642
int retval = -1;
535
int retval = 0;
643
536
gnutls_session_t session;
644
537
int pf; /* Protocol family */
645
538
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
539
switch(af){
654
540
case AF_INET6:
655
541
pf = PF_INET6;
658
544
pf = PF_INET;
659
545
break;
660
546
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
664
548
return -1;
665
549
}
666
550
670
554
}
671
555
672
556
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
558
"\n", ip, port);
676
559
}
677
560
678
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
562
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
563
perror("socket");
564
return -1;
689
565
}
690
566
691
567
memset(&to, 0, sizeof(to));
692
568
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
694
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
695
571
} else { /* IPv4 */
696
572
to.in.sin_family = (sa_family_t)af;
697
573
ret = inet_pton(af, ip, &to.in.sin_addr);
698
574
}
699
575
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
576
perror("inet_pton");
577
return -1;
704
578
}
705
579
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
711
582
}
712
583
if(af == AF_INET6){
713
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
716
587
717
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
590
-Wunreachable-code*/
720
591
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
593
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
594
return -1;
726
595
}
727
596
/* Set the network interface number as scope */
728
597
to.in6.sin6_scope_id = (uint32_t)if_index;
733
602
-Wunreachable-code */
734
603
}
735
604
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
605
if(debug){
742
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
607
char interface[IF_NAMESIZE];
744
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
609
perror("if_indextoname");
746
610
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
612
ip, interface, port);
750
613
}
751
614
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
754
617
}
755
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
626
sizeof(addrstr));
764
627
}
765
628
if(pcret == NULL){
766
perror_plus("inet_ntop");
629
perror("inet_ntop");
767
630
} else {
768
631
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
633
}
772
634
}
773
635
}
774
636
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
637
if(af == AF_INET6){
781
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
639
} else {
783
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
641
}
785
642
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
643
perror("connect");
644
return -1;
797
645
}
798
646
799
647
const char *out = mandos_protocol_version;
801
649
while(true){
802
650
size_t out_size = strlen(out);
803
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
652
out_size - written));
805
653
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
654
perror("write");
655
retval = -1;
809
656
goto mandos_end;
810
657
}
811
658
written += (size_t)ret;
819
666
break;
820
667
}
821
668
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
669
}
828
670
829
671
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
840
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
676
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
677
do{
848
678
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
680
855
681
if(ret != GNUTLS_E_SUCCESS){
856
682
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
684
gnutls_perror(ret);
860
685
}
861
errno = EPROTO;
686
retval = -1;
862
687
goto mandos_end;
863
688
}
864
689
865
690
/* Read OpenPGP packet that contains the wanted password */
866
691
867
692
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
870
695
}
871
696
872
697
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
698
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
699
buffer_capacity);
881
700
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
890
703
goto mandos_end;
891
704
}
892
705
901
714
case GNUTLS_E_AGAIN:
902
715
break;
903
716
case GNUTLS_E_REHANDSHAKE:
904
do {
717
do{
905
718
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
720
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
722
gnutls_perror(ret);
916
errno = EPROTO;
723
retval = -1;
917
724
goto mandos_end;
918
725
}
919
726
break;
920
727
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
728
fprintf(stderr, "Unknown error while reading data from"
923
729
" encrypted session with Mandos server\n");
730
retval = -1;
924
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
926
732
goto mandos_end;
927
733
}
928
734
} else {
931
737
}
932
738
933
739
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
950
744
951
745
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
954
748
&decrypted_buffer);
955
749
if(decrypted_buffer_size >= 0){
956
957
750
written = 0;
958
751
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
964
752
ret = (int)fwrite(decrypted_buffer + written, 1,
965
753
(size_t)decrypted_buffer_size - written,
966
754
stdout);
967
755
if(ret == 0 and ferror(stdout)){
968
int e = errno;
969
756
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
757
fprintf(stderr, "Error writing encrypted data: %s\n",
972
758
strerror(errno));
973
759
}
974
errno = e;
975
goto mandos_end;
760
retval = -1;
761
break;
976
762
}
977
763
written += (size_t)ret;
978
764
}
979
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
980
768
}
769
} else {
770
retval = -1;
981
771
}
982
772
983
773
/* Shutdown procedure */
984
774
985
775
mandos_end:
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1005
780
}
781
gnutls_deinit(session);
1006
782
return retval;
1007
783
}
1008
784
1025
801
/* Called whenever a service has been resolved successfully or
1026
802
timed out */
1027
803
1028
if(quit_now){
1029
return;
1030
}
1031
1032
804
switch(event){
1033
805
default:
1034
806
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
809
avahi_strerror(avahi_server_errno(mc.server)));
1039
810
break;
1043
814
char ip[AVAHI_ADDRESS_STR_MAX];
1044
815
avahi_address_snprint(ip, sizeof(ip), address);
1045
816
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
819
ip, (intmax_t)interface, port);
1050
820
}
1052
822
avahi_proto_to_af(proto));
1053
823
if(ret == 0){
1054
824
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1058
825
}
1059
826
}
1060
827
}
1076
843
/* Called whenever a new services becomes available on the LAN or
1077
844
is removed from the LAN */
1078
845
1079
if(quit_now){
1080
return;
1081
}
1082
1083
846
switch(event){
1084
847
default:
1085
848
case AVAHI_BROWSER_FAILURE:
1086
849
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
850
fprintf(stderr, "(Avahi browser) %s\n",
1089
851
avahi_strerror(avahi_server_errno(mc.server)));
1090
852
avahi_simple_poll_quit(mc.simple_poll);
1091
853
return;
1099
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
862
name, type, domain, protocol, 0,
1101
863
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1104
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1105
866
break;
1106
867
1110
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
873
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
875
}
1116
876
break;
1117
877
}
1118
878
}
1119
879
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1122
884
if(quit_now){
1123
885
return;
1124
886
}
1125
887
quit_now = 1;
1126
signal_received = sig;
1127
888
int old_errno = errno;
1128
/* set main loop to exit */
1129
889
if(mc.simple_poll != NULL){
1130
890
avahi_simple_poll_quit(mc.simple_poll);
1131
891
}
1132
892
errno = old_errno;
1133
893
}
1134
894
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
895
int main(int argc, char *argv[]){
1414
896
AvahiSServiceBrowser *sb = NULL;
1415
897
int error;
1417
899
intmax_t tmpmax;
1418
900
char *tmp;
1419
901
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
902
const char *interface = "eth0";
1421
903
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
904
int sd;
1424
905
uid_t uid;
1425
906
gid_t gid;
907
char *connect_to = NULL;
1426
908
char tempdir[] = "/tmp/mandosXXXXXX";
1427
909
bool tempdir_created = false;
1428
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
914
bool gnutls_initialized = false;
1433
915
bool gpgme_initialized = false;
1434
916
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
1437
917
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1439
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1440
920
1441
uid = getuid();
1442
gid = getgid();
1443
1444
/* Lower any group privileges we might have, just to be safe */
1445
errno = 0;
1446
ret = setgid(gid);
1447
if(ret == -1){
1448
perror_plus("setgid");
1449
}
1450
1451
/* Lower user privileges (temporarily) */
1452
errno = 0;
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror_plus("seteuid");
1456
}
1457
1458
if(quit_now){
1459
goto end;
1460
}
1461
1462
921
{
1463
922
struct argp_option options[] = {
1464
923
{ .name = "debug", .key = 128,
1493
952
.arg = "SECONDS",
1494
953
.doc = "Maximum delay to wait for interface startup",
1495
954
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
/*
1505
* These reproduce what we would get without ARGP_NO_HELP
1506
*/
1507
{ .name = "help", .key = '?',
1508
.doc = "Give this help list", .group = -1 },
1509
{ .name = "usage", .key = -3,
1510
.doc = "Give a short usage message", .group = -1 },
1511
{ .name = "version", .key = 'V',
1512
.doc = "Print program version", .group = -1 },
1513
955
{ .name = NULL }
1514
956
};
1515
957
1516
958
error_t parse_opt(int key, char *arg,
1517
959
struct argp_state *state){
1518
errno = 0;
1519
960
switch(key){
1520
961
case 128: /* --debug */
1521
962
debug = true;
1537
978
tmpmax = strtoimax(arg, &tmp, 10);
1538
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1539
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1540
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1541
983
}
1542
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1543
985
break;
1548
990
errno = 0;
1549
991
delay = strtof(arg, &tmp);
1550
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1551
argp_error(state, "Bad delay");
1552
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
break;
1565
/*
1566
* These reproduce what we would get without ARGP_NO_HELP
1567
*/
1568
case '?': /* --help */
1569
argp_state_help(state, state->out_stream,
1570
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1571
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1572
case -3: /* --usage */
1573
argp_state_help(state, state->out_stream,
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1579
1000
break;
1580
1001
default:
1581
1002
return ARGP_ERR_UNKNOWN;
1582
1003
}
1583
return errno;
1004
return 0;
1584
1005
}
1585
1006
1586
1007
struct argp argp = { .options = options, .parser = parse_opt,
1587
1008
.args_doc = "",
1588
1009
.doc = "Mandos client -- Get and decrypt"
1589
1010
" passwords from a Mandos server" };
1590
ret = argp_parse(&argp, argc, argv,
1591
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
switch(ret){
1593
case 0:
1594
break;
1595
case ENOMEM:
1596
default:
1597
errno = ret;
1598
perror_plus("argp_parse");
1599
exitcode = EX_OSERR;
1600
goto end;
1601
case EINVAL:
1602
exitcode = EX_USAGE;
1603
goto end;
1604
}
1605
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1758
1016
}
1759
1017
}
1760
1018
1762
1020
avahi_set_log_function(empty_log);
1763
1021
}
1764
1022
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1799
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
1024
from the signal handler */
1801
1025
/* Initialize the pseudo-RNG for Avahi */
1802
1026
srand((unsigned int) time(NULL));
1803
1027
mc.simple_poll = avahi_simple_poll_new();
1804
1028
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
1807
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1808
1031
goto end;
1809
1032
}
1810
1033
1811
1034
sigemptyset(&sigterm_action.sa_mask);
1812
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1813
1036
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1816
1039
goto end;
1817
1040
}
1818
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1819
1042
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1822
1045
goto end;
1823
1046
}
1824
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1825
1048
if(ret == -1){
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
/* Need to check if the handler is SIG_IGN before handling:
1831
| [[info:libc:Initial Signal Actions]] |
1832
| [[info:libc:Basic Signal Handling]] |
1833
*/
1834
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
return EX_OSERR;
1838
}
1839
if(old_sigterm_action.sa_handler != SIG_IGN){
1840
ret = sigaction(SIGINT, &sigterm_action, NULL);
1841
if(ret == -1){
1842
perror_plus("sigaction");
1843
exitcode = EX_OSERR;
1844
goto end;
1845
}
1846
}
1847
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGTERM, 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(SIGTERM, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1873
1059
1874
1060
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1061
if(interface[0] != '\0'){
1895
1062
#ifdef __linux__
1896
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1898
1065
ret = klogctl(8, NULL, 5);
1899
1066
bool restore_loglevel = true;
1900
1067
if(ret == -1){
1901
1068
restore_loglevel = false;
1902
perror_plus("klogctl");
1069
perror("klogctl");
1903
1070
}
1904
1071
#endif /* __linux__ */
1905
1072
1906
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
1074
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1910
1077
#ifdef __linux__
1911
1078
if(restore_loglevel){
1912
1079
ret = klogctl(7, NULL, 0);
1913
1080
if(ret == -1){
1914
perror_plus("klogctl");
1081
perror("klogctl");
1915
1082
}
1916
1083
}
1917
1084
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
1085
goto end;
1925
1086
}
1926
1087
strcpy(network.ifr_name, interface);
1927
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
1089
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1930
1091
#ifdef __linux__
1931
1092
if(restore_loglevel){
1932
1093
ret = klogctl(7, NULL, 0);
1933
1094
if(ret == -1){
1934
perror_plus("klogctl");
1095
perror("klogctl");
1935
1096
}
1936
1097
}
1937
1098
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1099
exitcode = EXIT_FAILURE;
1945
1100
goto end;
1946
1101
}
1947
1102
if((network.ifr_flags & IFF_UP) == 0){
1948
1103
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
1105
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1955
1108
#ifdef __linux__
1956
1109
if(restore_loglevel){
1957
1110
ret = klogctl(7, NULL, 0);
1958
1111
if(ret == -1){
1959
perror_plus("klogctl");
1112
perror("klogctl");
1960
1113
}
1961
1114
}
1962
1115
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
1116
goto end;
1970
1117
}
1971
1118
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1974
1120
for(int i=0; i < delay * 4; i++){
1975
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
1122
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1978
1124
} else if(network.ifr_flags & IFF_RUNNING){
1979
1125
break;
1980
1126
}
1981
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
1128
ret = nanosleep(&sleeptime, NULL);
1983
1129
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1130
perror("nanosleep");
1985
1131
}
1986
1132
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1993
1136
}
1994
1137
#ifdef __linux__
1995
1138
if(restore_loglevel){
1996
1139
/* Restores kernel loglevel to default */
1997
1140
ret = klogctl(7, NULL, 0);
1998
1141
if(ret == -1){
1999
perror_plus("klogctl");
1142
perror("klogctl");
2000
1143
}
2001
1144
}
2002
1145
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2018
}
2019
2020
if(quit_now){
2021
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2022
1160
}
2023
1161
2024
1162
ret = init_gnutls_global(pubkey, seckey);
2025
1163
if(ret == -1){
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2028
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2029
1166
goto end;
2030
1167
} else {
2031
1168
gnutls_initialized = true;
2032
1169
}
2033
1170
2034
if(quit_now){
2035
goto end;
2036
}
2037
2038
1171
if(mkdtemp(tempdir) == NULL){
2039
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2040
1173
goto end;
2041
1174
}
2042
1175
tempdir_created = true;
2043
1176
2044
if(quit_now){
2045
goto end;
2046
}
2047
2048
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2052
1180
goto end;
2053
1181
} else {
2054
1182
gpgme_initialized = true;
2055
1183
}
2056
1184
2057
if(quit_now){
2058
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2059
1192
}
2060
1193
2061
1194
if(connect_to != NULL){
2063
1196
/* (Mainly meant for debugging) */
2064
1197
char *address = strrchr(connect_to, ':');
2065
1198
if(address == NULL){
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2076
1203
uint16_t port;
2077
1204
errno = 0;
2078
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2079
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
1207
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2091
1212
port = (uint16_t)tmpmax;
2092
1213
*address = '\0';
1214
address = connect_to;
2093
1215
/* Colon in address indicates IPv6 */
2094
1216
int af;
2095
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2096
1218
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
2103
1219
} else {
2104
1220
af = AF_INET;
2105
1221
}
2106
address = connect_to;
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2125
1226
exitcode = EXIT_SUCCESS;
2126
1227
}
1228
goto end;
1229
}
2127
1230
2128
goto end;
2129
}
2130
2131
if(quit_now){
2132
goto end;
2133
}
2134
2135
1231
{
2136
1232
AvahiServerConfig config;
2137
1233
/* Do not publish any local Zeroconf records */
2152
1248
2153
1249
/* Check if creating the Avahi server object succeeded */
2154
1250
if(mc.server == NULL){
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2157
1252
avahi_strerror(error));
2158
exitcode = EX_UNAVAILABLE;
2159
goto end;
2160
}
2161
2162
if(quit_now){
1253
exitcode = EXIT_FAILURE;
2163
1254
goto end;
2164
1255
}
2165
1256
2168
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2169
1260
NULL, 0, browse_callback, NULL);
2170
1261
if(sb == NULL){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2173
1263
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
1264
exitcode = EXIT_FAILURE;
2179
1265
goto end;
2180
1266
}
2181
1267
2182
1268
/* Run the main loop */
2183
1269
2184
1270
if(debug){
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2187
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2191
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2196
1275
2197
1276
end:
2198
1277
2199
1278
if(debug){
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2202
1280
}
2203
1281
2204
1282
/* Cleanup things */
2220
1298
if(gpgme_initialized){
2221
1299
gpgme_release(mc.ctx);
2222
1300
}
2223
2224
/* Cleans up the circular linked list of Mandos servers the client
2225
has seen */
2226
if(mc.current_server != NULL){
2227
mc.current_server->prev->next = NULL;
2228
while(mc.current_server != NULL){
2229
server *next = mc.current_server->next;
2230
free(mc.current_server);
2231
mc.current_server = next;
2232
}
2233
}
2234
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2244
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2266
}
2267
}
2268
2269
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2270
1303
if(tempdir_created){
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2278
1324
char *fullname = NULL;
2279
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2280
1326
direntry->d_name);
2281
1327
if(ret < 0){
2282
perror_plus("asprintf");
1328
perror("asprintf");
2283
1329
continue;
2284
1330
}
2285
1331
ret = remove(fullname);
2286
1332
if(ret == -1){
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2289
1335
}
2290
1336
free(fullname);
2291
1337
}
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
1338
closedir(d);
2298
1339
}
2299
1340
ret = rmdir(tempdir);
2300
1341
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
2302
}
2303
}
2304
2305
if(quit_now){
2306
sigemptyset(&old_sigterm_action.sa_mask);
2307
old_sigterm_action.sa_handler = SIG_DFL;
2308
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2309
&old_sigterm_action,
2310
NULL));
2311
if(ret == -1){
2312
perror_plus("sigaction");
2313
}
2314
do {
2315
ret = raise(signal_received);
2316
} while(ret != 0 and errno == EINTR);
2317
if(ret != 0){
2318
perror_plus("raise");
2319
abort();
2320
}
2321
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2322
1344
}
2323
1345
2324
1346
return exitcode;
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Version: 2.0.2.dev0