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- Committer: Teddy Hogeborn
- Date: 2009-02-13 05:38:21 UTC
- Revision ID: teddy@fukt.bsnet.se-20090213053821-03e696gckk4nbjps
Support not using IPv6 in server:
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
- 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
43
39
stdout, ferror(), remove() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
53
49
sockaddr_in6, PF_INET6,
54
50
SOCK_STREAM, uid_t, gid_t, open(),
55
51
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
54
inet_pton(), connect() */
59
55
#include <fcntl.h> /* open() */
62
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
59
strtoimax() */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
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() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
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
78
#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() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
90
81
91
82
#ifdef __linux__
92
83
#include <sys/klog.h> /* klogctl() */
110
101
init_gnutls_session(),
111
102
GNUTLS_* */
112
103
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
115
106
116
107
/* GPGME */
117
108
#include <gpgme.h> /* All GPGME types, constants and
125
116
#define PATHDIR "/conf/conf.d/mandos"
126
117
#define SECKEY "seckey.txt"
127
118
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
119
130
120
bool debug = false;
131
121
static const char mandos_protocol_version[] = "1";
132
122
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;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
124
149
125
/* Used for passing in values through the Avahi callback functions */
150
126
typedef struct {
155
131
gnutls_dh_params_t dh_params;
156
132
const char *priority;
157
133
gpgme_ctx_t ctx;
158
server *current_server;
159
134
} mandos_context;
160
135
161
136
/* global context so signal handler can reach it*/
162
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
138
.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
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
184
140
185
141
/*
186
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
144
* "buffer_length" is how much is already used.
189
145
*/
190
146
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
147
size_t buffer_capacity){
192
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
150
if(buffer == NULL){
199
155
return buffer_capacity;
200
156
}
201
157
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
239
158
/*
240
159
* Initialize GPGME.
241
160
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
244
164
gpgme_error_t rc;
245
165
gpgme_engine_info_t engine_info;
246
166
249
169
* Helper function to insert pub and seckey to the engine keyring.
250
170
*/
251
171
bool import_key(const char *filename){
252
int ret;
253
172
int fd;
254
173
gpgme_data_t pgp_data;
255
174
256
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
176
if(fd == -1){
258
perror_plus("open");
177
perror("open");
259
178
return false;
260
179
}
261
180
262
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
182
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
184
gpgme_strsource(rc), gpgme_strerror(rc));
267
185
return false;
268
186
}
269
187
270
188
rc = gpgme_op_import(mc.ctx, pgp_data);
271
189
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
274
191
gpgme_strsource(rc), gpgme_strerror(rc));
275
192
return false;
276
193
}
277
194
278
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
196
if(ret == -1){
280
perror_plus("close");
197
perror("close");
281
198
}
282
199
gpgme_data_release(pgp_data);
283
200
return true;
284
201
}
285
202
286
203
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
204
fprintf(stderr, "Initializing GPGME\n");
289
205
}
290
206
291
207
/* Init GPGME */
292
208
gpgme_check_version(NULL);
293
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
210
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
212
gpgme_strsource(rc), gpgme_strerror(rc));
298
213
return false;
299
214
}
300
215
301
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
302
217
rc = gpgme_get_engine_info(&engine_info);
303
218
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
220
gpgme_strsource(rc), gpgme_strerror(rc));
307
221
return false;
308
222
}
315
229
engine_info = engine_info->next;
316
230
}
317
231
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
233
return false;
321
234
}
322
235
323
236
/* Create new GPGME "context" */
324
237
rc = gpgme_new(&(mc.ctx));
325
238
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
329
241
return false;
330
242
}
331
243
333
245
return false;
334
246
}
335
247
336
return true;
248
return true;
337
249
}
338
250
339
251
/*
350
262
ssize_t plaintext_length = 0;
351
263
352
264
if(debug){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
266
}
356
267
357
268
/* Create new GPGME data buffer from memory cryptotext */
358
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
270
0);
360
271
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
273
gpgme_strsource(rc), gpgme_strerror(rc));
364
274
return -1;
365
275
}
367
277
/* Create new empty GPGME data buffer for the plaintext */
368
278
rc = gpgme_data_new(&dh_plain);
369
279
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
372
281
gpgme_strsource(rc), gpgme_strerror(rc));
373
282
gpgme_data_release(dh_crypto);
374
283
return -1;
378
287
data buffer */
379
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
289
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
291
gpgme_strsource(rc), gpgme_strerror(rc));
384
292
plaintext_length = -1;
385
293
if(debug){
386
294
gpgme_decrypt_result_t result;
387
295
result = gpgme_op_decrypt_result(mc.ctx);
388
296
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
298
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
299
fprintf(stderr, "Unsupported algorithm: %s\n",
394
300
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
301
fprintf(stderr, "Wrong key usage: %u\n",
397
302
result->wrong_key_usage);
398
303
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
304
fprintf(stderr, "File name: %s\n", result->file_name);
401
305
}
402
306
gpgme_recipient_t recipient;
403
307
recipient = result->recipients;
404
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
413
? "No" : "Yes");
414
recipient = recipient->next;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
415
318
}
416
319
}
417
320
}
419
322
}
420
323
421
324
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
326
}
425
327
426
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
427
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
428
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
429
331
plaintext_length = -1;
430
332
goto decrypt_end;
431
333
}
433
335
*plaintext = NULL;
434
336
while(true){
435
337
plaintext_capacity = incbuffer(plaintext,
436
(size_t)plaintext_length,
437
plaintext_capacity);
338
(size_t)plaintext_length,
339
plaintext_capacity);
438
340
if(plaintext_capacity == 0){
439
perror_plus("incbuffer");
440
plaintext_length = -1;
441
goto decrypt_end;
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
442
344
}
443
345
444
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
351
break;
450
352
}
451
353
if(ret < 0){
452
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
453
355
plaintext_length = -1;
454
356
goto decrypt_end;
455
357
}
457
359
}
458
360
459
361
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
362
fprintf(stderr, "Decrypted password is: ");
462
363
for(ssize_t i = 0; i < plaintext_length; i++){
463
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
365
}
486
387
/* GnuTLS log function callback */
487
388
static void debuggnutls(__attribute__((unused)) int level,
488
389
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
390
fprintf(stderr, "GnuTLS: %s", string);
490
391
}
491
392
492
393
static int init_gnutls_global(const char *pubkeyfilename,
494
395
int ret;
495
396
496
397
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
499
399
}
500
400
501
401
ret = gnutls_global_init();
502
402
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
505
405
return -1;
506
406
}
507
407
514
414
}
515
415
516
416
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
518
418
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
521
424
gnutls_global_deinit();
522
425
return -1;
523
426
}
524
427
525
428
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
528
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
431
seckeyfilename);
530
432
}
534
436
GNUTLS_OPENPGP_FMT_BASE64);
535
437
if(ret != GNUTLS_E_SUCCESS){
536
438
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
542
443
goto globalfail;
543
444
}
544
445
545
446
/* GnuTLS server initialization */
546
447
ret = gnutls_dh_params_init(&mc.dh_params);
547
448
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
550
450
" %s\n", safer_gnutls_strerror(ret));
551
451
goto globalfail;
552
452
}
553
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
454
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
557
456
safer_gnutls_strerror(ret));
558
457
goto globalfail;
559
458
}
573
472
static int init_gnutls_session(gnutls_session_t *session){
574
473
int ret;
575
474
/* GnuTLS session creation */
576
do {
577
ret = gnutls_init(session, GNUTLS_SERVER);
578
if(quit_now){
579
return -1;
580
}
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
582
476
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
585
478
safer_gnutls_strerror(ret));
586
479
}
587
480
588
481
{
589
482
const char *err;
590
do {
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
484
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
602
488
gnutls_deinit(*session);
603
489
return -1;
604
490
}
605
491
}
606
492
607
do {
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
609
mc.cred);
610
if(quit_now){
611
gnutls_deinit(*session);
612
return -1;
613
}
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
615
495
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
618
497
safer_gnutls_strerror(ret));
619
498
gnutls_deinit(*session);
620
499
return -1;
621
500
}
622
501
623
502
/* ignore client certificate if any. */
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
625
505
626
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
627
507
636
516
static int start_mandos_communication(const char *ip, uint16_t port,
637
517
AvahiIfIndex if_index,
638
518
int af){
639
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
640
520
ssize_t sret;
641
521
union {
642
522
struct sockaddr_in in;
643
523
struct sockaddr_in6 in6;
644
524
} to;
645
525
char *buffer = NULL;
646
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
647
527
size_t buffer_length = 0;
648
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
649
530
size_t written;
650
int retval = -1;
531
int retval = 0;
651
532
gnutls_session_t session;
652
533
int pf; /* Protocol family */
653
534
654
errno = 0;
655
656
if(quit_now){
657
errno = EINTR;
658
return -1;
659
}
660
661
535
switch(af){
662
536
case AF_INET6:
663
537
pf = PF_INET6;
666
540
pf = PF_INET;
667
541
break;
668
542
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
671
errno = EINVAL;
543
fprintf(stderr, "Bad address family: %d\n", af);
672
544
return -1;
673
545
}
674
546
678
550
}
679
551
680
552
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
683
554
"\n", ip, port);
684
555
}
685
556
686
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
687
558
if(tcp_sd < 0){
688
int e = errno;
689
perror_plus("socket");
690
errno = e;
691
goto mandos_end;
692
}
693
694
if(quit_now){
695
errno = EINTR;
696
goto mandos_end;
559
perror("socket");
560
return -1;
697
561
}
698
562
699
563
memset(&to, 0, sizeof(to));
700
564
if(af == AF_INET6){
701
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
702
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
703
567
} else { /* IPv4 */
704
568
to.in.sin_family = (sa_family_t)af;
705
569
ret = inet_pton(af, ip, &to.in.sin_addr);
706
570
}
707
571
if(ret < 0 ){
708
int e = errno;
709
perror_plus("inet_pton");
710
errno = e;
711
goto mandos_end;
572
perror("inet_pton");
573
return -1;
712
574
}
713
575
if(ret == 0){
714
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
717
errno = e;
718
goto mandos_end;
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
719
578
}
720
579
if(af == AF_INET6){
721
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
724
583
725
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
586
-Wunreachable-code*/
728
587
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
731
589
" without a network interface\n");
732
errno = EINVAL;
733
goto mandos_end;
590
return -1;
734
591
}
735
592
/* Set the network interface number as scope */
736
593
to.in6.sin6_scope_id = (uint32_t)if_index;
741
598
-Wunreachable-code */
742
599
}
743
600
744
if(quit_now){
745
errno = EINTR;
746
goto mandos_end;
747
}
748
749
601
if(debug){
750
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
603
char interface[IF_NAMESIZE];
752
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
605
perror("if_indextoname");
754
606
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
757
608
ip, interface, port);
758
609
}
759
610
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
762
613
}
763
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
771
622
sizeof(addrstr));
772
623
}
773
624
if(pcret == NULL){
774
perror_plus("inet_ntop");
625
perror("inet_ntop");
775
626
} else {
776
627
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
779
629
}
780
630
}
781
631
}
782
632
783
if(quit_now){
784
errno = EINTR;
785
goto mandos_end;
786
}
787
788
633
if(af == AF_INET6){
789
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
790
635
} else {
791
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
792
637
}
793
638
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
799
goto mandos_end;
800
}
801
802
if(quit_now){
803
errno = EINTR;
804
goto mandos_end;
639
perror("connect");
640
return -1;
805
641
}
806
642
807
643
const char *out = mandos_protocol_version;
809
645
while(true){
810
646
size_t out_size = strlen(out);
811
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
812
out_size - written));
648
out_size - written));
813
649
if(ret == -1){
814
int e = errno;
815
perror_plus("write");
816
errno = e;
650
perror("write");
651
retval = -1;
817
652
goto mandos_end;
818
653
}
819
654
written += (size_t)ret;
827
662
break;
828
663
}
829
664
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
665
}
836
666
837
667
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
840
}
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
/* Spurious warning from -Wint-to-pointer-cast */
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
848
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
849
672
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
855
do {
673
do{
856
674
ret = gnutls_handshake(session);
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
862
676
863
677
if(ret != GNUTLS_E_SUCCESS){
864
678
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
867
680
gnutls_perror(ret);
868
681
}
869
errno = EPROTO;
682
retval = -1;
870
683
goto mandos_end;
871
684
}
872
685
873
686
/* Read OpenPGP packet that contains the wanted password */
874
687
875
688
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
878
691
}
879
692
880
693
while(true){
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
694
buffer_capacity = incbuffer(&buffer, buffer_length,
888
buffer_capacity);
695
buffer_capacity);
889
696
if(buffer_capacity == 0){
890
int e = errno;
891
perror_plus("incbuffer");
892
errno = e;
893
goto mandos_end;
894
}
895
896
if(quit_now){
897
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
898
699
goto mandos_end;
899
700
}
900
701
909
710
case GNUTLS_E_AGAIN:
910
711
break;
911
712
case GNUTLS_E_REHANDSHAKE:
912
do {
713
do{
913
714
ret = gnutls_handshake(session);
914
915
if(quit_now){
916
errno = EINTR;
917
goto mandos_end;
918
}
919
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
716
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
923
718
gnutls_perror(ret);
924
errno = EPROTO;
719
retval = -1;
925
720
goto mandos_end;
926
721
}
927
722
break;
928
723
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
724
fprintf(stderr, "Unknown error while reading data from"
931
725
" encrypted session with Mandos server\n");
726
retval = -1;
932
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
errno = EIO;
934
728
goto mandos_end;
935
729
}
936
730
} else {
939
733
}
940
734
941
735
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
944
}
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
do {
952
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
if(quit_now){
954
errno = EINTR;
955
goto mandos_end;
956
}
957
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
958
740
959
741
if(buffer_length > 0){
960
ssize_t decrypted_buffer_size;
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
962
744
&decrypted_buffer);
963
745
if(decrypted_buffer_size >= 0){
964
965
746
written = 0;
966
747
while(written < (size_t) decrypted_buffer_size){
967
if(quit_now){
968
errno = EINTR;
969
goto mandos_end;
970
}
971
972
748
ret = (int)fwrite(decrypted_buffer + written, 1,
973
749
(size_t)decrypted_buffer_size - written,
974
750
stdout);
975
751
if(ret == 0 and ferror(stdout)){
976
int e = errno;
977
752
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
753
fprintf(stderr, "Error writing encrypted data: %s\n",
980
754
strerror(errno));
981
755
}
982
errno = e;
983
goto mandos_end;
756
retval = -1;
757
break;
984
758
}
985
759
written += (size_t)ret;
986
760
}
987
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
988
764
}
765
} else {
766
retval = -1;
989
767
}
990
768
991
769
/* Shutdown procedure */
992
770
993
771
mandos_end:
994
{
995
int e = errno;
996
free(decrypted_buffer);
997
free(buffer);
998
if(tcp_sd >= 0){
999
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1000
}
1001
if(ret == -1){
1002
if(e == 0){
1003
e = errno;
1004
}
1005
perror_plus("close");
1006
}
1007
gnutls_deinit(session);
1008
errno = e;
1009
if(quit_now){
1010
errno = EINTR;
1011
retval = -1;
1012
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
1013
776
}
777
gnutls_deinit(session);
1014
778
return retval;
1015
779
}
1016
780
1033
797
/* Called whenever a service has been resolved successfully or
1034
798
timed out */
1035
799
1036
if(quit_now){
1037
return;
1038
}
1039
1040
800
switch(event){
1041
801
default:
1042
802
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1045
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
805
avahi_strerror(avahi_server_errno(mc.server)));
1047
806
break;
1051
810
char ip[AVAHI_ADDRESS_STR_MAX];
1052
811
avahi_address_snprint(ip, sizeof(ip), address);
1053
812
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1056
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
815
ip, (intmax_t)interface, port);
1058
816
}
1060
818
avahi_proto_to_af(proto));
1061
819
if(ret == 0){
1062
820
avahi_simple_poll_quit(mc.simple_poll);
1063
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1066
821
}
1067
822
}
1068
823
}
1084
839
/* Called whenever a new services becomes available on the LAN or
1085
840
is removed from the LAN */
1086
841
1087
if(quit_now){
1088
return;
1089
}
1090
1091
842
switch(event){
1092
843
default:
1093
844
case AVAHI_BROWSER_FAILURE:
1094
845
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
846
fprintf(stderr, "(Avahi browser) %s\n",
1097
847
avahi_strerror(avahi_server_errno(mc.server)));
1098
848
avahi_simple_poll_quit(mc.simple_poll);
1099
849
return;
1107
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
858
name, type, domain, protocol, 0,
1109
859
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1112
861
name, avahi_strerror(avahi_server_errno(mc.server)));
1113
862
break;
1114
863
1118
867
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
868
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
869
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
870
fprintf(stderr, "No Mandos server found, still searching...\n");
1123
871
}
1124
872
break;
1125
873
}
1126
874
}
1127
875
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1130
880
if(quit_now){
1131
881
return;
1132
882
}
1133
883
quit_now = 1;
1134
signal_received = sig;
1135
884
int old_errno = errno;
1136
/* set main loop to exit */
1137
885
if(mc.simple_poll != NULL){
1138
886
avahi_simple_poll_quit(mc.simple_poll);
1139
887
}
1140
888
errno = old_errno;
1141
889
}
1142
890
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
int ret;
1145
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
if(s < 0){
1148
perror_plus("socket");
1149
return false;
1150
}
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
if(ret == -1){
1154
if(debug){
1155
perror_plus("ioctl SIOCGIFFLAGS");
1156
}
1157
return false;
1158
}
1159
return true;
1160
}
1161
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1169
}
1170
return false;
1171
}
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1177
}
1178
return true;
1179
}
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1193
}
1194
return false;
1195
}
1196
1197
/* Accept this device */
1198
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1201
}
1202
return true;
1203
}
1204
1205
/*
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1209
*/
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1212
return 0;
1213
}
1214
1215
struct ifreq ifr;
1216
if(not get_flags(if_entry->d_name, &ifr)){
1217
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1283
return 0;
1284
}
1285
return 1;
1286
}
1287
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1290
int ret;
1291
size_t sret;
1292
struct stat st;
1293
1294
if((direntry->d_name)[0] == '\0'){
1295
/* Empty name? */
1296
return 0;
1297
}
1298
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1301
"0123456789"
1302
"_-");
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1305
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1321
if(ret == -1){
1322
if(debug){
1323
perror_plus("Could not stat hook");
1324
}
1325
return 0;
1326
}
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1329
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1333
}
1334
return 0;
1335
}
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1338
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
return 1;
1346
}
1347
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1349
int ret;
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1353
1354
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1359
}
1360
ret = avahi_simple_poll_iterate(s, -1);
1361
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1366
}
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1389
}
1390
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1396
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1398
return 0;
1399
}
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1409
}
1410
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
}
1413
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1416
}
1417
}
1418
}
1419
}
1420
1421
891
int main(int argc, char *argv[]){
1422
892
AvahiSServiceBrowser *sb = NULL;
1423
893
int error;
1425
895
intmax_t tmpmax;
1426
896
char *tmp;
1427
897
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
898
const char *interface = "eth0";
1429
899
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
900
int sd;
1432
901
uid_t uid;
1433
902
gid_t gid;
903
char *connect_to = NULL;
1434
904
char tempdir[] = "/tmp/mandosXXXXXX";
1435
905
bool tempdir_created = false;
1436
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1440
910
bool gnutls_initialized = false;
1441
911
bool gpgme_initialized = false;
1442
912
float delay = 2.5f;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1445
913
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1447
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1448
916
1449
uid = getuid();
1450
gid = getgid();
1451
1452
/* Lower any group privileges we might have, just to be safe */
1453
errno = 0;
1454
ret = setgid(gid);
1455
if(ret == -1){
1456
perror_plus("setgid");
1457
}
1458
1459
/* Lower user privileges (temporarily) */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror_plus("seteuid");
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
917
{
1471
918
struct argp_option options[] = {
1472
919
{ .name = "debug", .key = 128,
1501
948
.arg = "SECONDS",
1502
949
.doc = "Maximum delay to wait for interface startup",
1503
950
.group = 2 },
1504
{ .name = "retry", .key = 132,
1505
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1507
.group = 2 },
1508
{ .name = "network-hook-dir", .key = 133,
1509
.arg = "DIR",
1510
.doc = "Directory where network hooks are located",
1511
.group = 2 },
1512
/*
1513
* These reproduce what we would get without ARGP_NO_HELP
1514
*/
1515
{ .name = "help", .key = '?',
1516
.doc = "Give this help list", .group = -1 },
1517
{ .name = "usage", .key = -3,
1518
.doc = "Give a short usage message", .group = -1 },
1519
{ .name = "version", .key = 'V',
1520
.doc = "Print program version", .group = -1 },
1521
951
{ .name = NULL }
1522
952
};
1523
953
1524
954
error_t parse_opt(int key, char *arg,
1525
955
struct argp_state *state){
1526
errno = 0;
1527
956
switch(key){
1528
957
case 128: /* --debug */
1529
958
debug = true;
1545
974
tmpmax = strtoimax(arg, &tmp, 10);
1546
975
if(errno != 0 or tmp == arg or *tmp != '\0'
1547
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1548
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1549
979
}
1550
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1551
981
break;
1556
986
errno = 0;
1557
987
delay = strtof(arg, &tmp);
1558
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1560
}
1561
case 132: /* --retry */
1562
errno = 0;
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1568
}
1569
break;
1570
case 133: /* --network-hook-dir */
1571
hookdir = arg;
1572
break;
1573
/*
1574
* These reproduce what we would get without ARGP_NO_HELP
1575
*/
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1587
996
break;
1588
997
default:
1589
998
return ARGP_ERR_UNKNOWN;
1590
999
}
1591
return errno;
1000
return 0;
1592
1001
}
1593
1002
1594
1003
struct argp argp = { .options = options, .parser = parse_opt,
1595
1004
.args_doc = "",
1596
1005
.doc = "Mandos client -- Get and decrypt"
1597
1006
" passwords from a Mandos server" };
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1600
switch(ret){
1601
case 0:
1602
break;
1603
case ENOMEM:
1604
default:
1605
errno = ret;
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1608
goto end;
1609
case EINVAL:
1610
exitcode = EX_USAGE;
1611
goto end;
1612
}
1613
}
1614
1615
{
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
1683
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1771
1012
}
1772
1013
}
1773
1014
1775
1016
avahi_set_log_function(empty_log);
1776
1017
}
1777
1018
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
1020
from the signal handler */
1814
1021
/* Initialize the pseudo-RNG for Avahi */
1815
1022
srand((unsigned int) time(NULL));
1816
1023
mc.simple_poll = avahi_simple_poll_new();
1817
1024
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1821
1027
goto end;
1822
1028
}
1823
1029
1824
1030
sigemptyset(&sigterm_action.sa_mask);
1825
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
1032
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1829
1035
goto end;
1830
1036
}
1831
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
1038
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1835
1041
goto end;
1836
1042
}
1837
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
1044
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, 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(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, 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(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1886
1055
1887
1056
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1057
if(interface[0] != '\0'){
1908
1058
#ifdef __linux__
1909
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1060
messages to mess up the prompt */
1911
1061
ret = klogctl(8, NULL, 5);
1912
1062
bool restore_loglevel = true;
1913
1063
if(ret == -1){
1914
1064
restore_loglevel = false;
1915
perror_plus("klogctl");
1065
perror("klogctl");
1916
1066
}
1917
1067
#endif /* __linux__ */
1918
1068
1919
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
1070
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1923
1073
#ifdef __linux__
1924
1074
if(restore_loglevel){
1925
1075
ret = klogctl(7, NULL, 0);
1926
1076
if(ret == -1){
1927
perror_plus("klogctl");
1077
perror("klogctl");
1928
1078
}
1929
1079
}
1930
1080
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
1081
goto end;
1938
1082
}
1939
1083
strcpy(network.ifr_name, interface);
1940
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
1085
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1086
perror("ioctl SIOCGIFFLAGS");
1943
1087
#ifdef __linux__
1944
1088
if(restore_loglevel){
1945
1089
ret = klogctl(7, NULL, 0);
1946
1090
if(ret == -1){
1947
perror_plus("klogctl");
1091
perror("klogctl");
1948
1092
}
1949
1093
}
1950
1094
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1095
exitcode = EXIT_FAILURE;
1958
1096
goto end;
1959
1097
}
1960
1098
if((network.ifr_flags & IFF_UP) == 0){
1961
1099
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
1101
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1968
1104
#ifdef __linux__
1969
1105
if(restore_loglevel){
1970
1106
ret = klogctl(7, NULL, 0);
1971
1107
if(ret == -1){
1972
perror_plus("klogctl");
1108
perror("klogctl");
1973
1109
}
1974
1110
}
1975
1111
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
1112
goto end;
1983
1113
}
1984
1114
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1115
/* sleep checking until interface is running */
1987
1116
for(int i=0; i < delay * 4; i++){
1988
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
1118
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1119
perror("ioctl SIOCGIFFLAGS");
1991
1120
} else if(network.ifr_flags & IFF_RUNNING){
1992
1121
break;
1993
1122
}
1994
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
1124
ret = nanosleep(&sleeptime, NULL);
1996
1125
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1126
perror("nanosleep");
1998
1127
}
1999
1128
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
2006
1132
}
2007
1133
#ifdef __linux__
2008
1134
if(restore_loglevel){
2009
1135
/* Restores kernel loglevel to default */
2010
1136
ret = klogctl(7, NULL, 0);
2011
1137
if(ret == -1){
2012
perror_plus("klogctl");
1138
perror("klogctl");
2013
1139
}
2014
1140
}
2015
1141
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
} else {
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2031
}
2032
2033
if(quit_now){
2034
goto end;
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
2035
1156
}
2036
1157
2037
1158
ret = init_gnutls_global(pubkey, seckey);
2038
1159
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
2042
1162
goto end;
2043
1163
} else {
2044
1164
gnutls_initialized = true;
2045
1165
}
2046
1166
2047
if(quit_now){
2048
goto end;
2049
}
2050
2051
1167
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
1168
perror("mkdtemp");
2053
1169
goto end;
2054
1170
}
2055
1171
tempdir_created = true;
2056
1172
2057
if(quit_now){
2058
goto end;
2059
}
2060
2061
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
2065
1176
goto end;
2066
1177
} else {
2067
1178
gpgme_initialized = true;
2068
1179
}
2069
1180
2070
if(quit_now){
2071
goto end;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
2072
1188
}
2073
1189
2074
1190
if(connect_to != NULL){
2076
1192
/* (Mainly meant for debugging) */
2077
1193
char *address = strrchr(connect_to, ':');
2078
1194
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2081
exitcode = EX_USAGE;
2082
goto end;
2083
}
2084
2085
if(quit_now){
2086
goto end;
2087
}
2088
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
2089
1199
uint16_t port;
2090
1200
errno = 0;
2091
1201
tmpmax = strtoimax(address+1, &tmp, 10);
2092
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
1203
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2096
exitcode = EX_USAGE;
2097
goto end;
2098
}
2099
2100
if(quit_now){
2101
goto end;
2102
}
2103
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
2104
1208
port = (uint16_t)tmpmax;
2105
1209
*address = '\0';
1210
address = connect_to;
2106
1211
/* Colon in address indicates IPv6 */
2107
1212
int af;
2108
if(strchr(connect_to, ':') != NULL){
1213
if(strchr(address, ':') != NULL){
2109
1214
af = AF_INET6;
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2112
{
2113
connect_to++;
2114
address[-1] = '\0';
2115
}
2116
1215
} else {
2117
1216
af = AF_INET;
2118
1217
}
2119
address = connect_to;
2120
2121
if(quit_now){
2122
goto end;
2123
}
2124
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2128
break;
2129
}
2130
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2133
}
2134
sleep((int)retry_interval);
2135
}
2136
2137
if (not quit_now){
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
2138
1222
exitcode = EXIT_SUCCESS;
2139
1223
}
1224
goto end;
1225
}
2140
1226
2141
goto end;
2142
}
2143
2144
if(quit_now){
2145
goto end;
2146
}
2147
2148
1227
{
2149
1228
AvahiServerConfig config;
2150
1229
/* Do not publish any local Zeroconf records */
2165
1244
2166
1245
/* Check if creating the Avahi server object succeeded */
2167
1246
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
2170
1248
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
2172
goto end;
2173
}
2174
2175
if(quit_now){
1249
exitcode = EXIT_FAILURE;
2176
1250
goto end;
2177
1251
}
2178
1252
2181
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
1256
NULL, 0, browse_callback, NULL);
2183
1257
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
1258
fprintf(stderr, "Failed to create service browser: %s\n",
2186
1259
avahi_strerror(avahi_server_errno(mc.server)));
2187
exitcode = EX_UNAVAILABLE;
2188
goto end;
2189
}
2190
2191
if(quit_now){
1260
exitcode = EXIT_FAILURE;
2192
1261
goto end;
2193
1262
}
2194
1263
2195
1264
/* Run the main loop */
2196
1265
2197
1266
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2200
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2204
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2208
}
1267
fprintf(stderr, "Starting Avahi loop search\n");
1268
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
2209
1271
2210
1272
end:
2211
1273
2212
1274
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
1275
fprintf(stderr, "%s exiting\n", argv[0]);
2215
1276
}
2216
1277
2217
1278
/* Cleanup things */
2233
1294
if(gpgme_initialized){
2234
1295
gpgme_release(mc.ctx);
2235
1296
}
2236
2237
/* Cleans up the circular linked list of Mandos servers the client
2238
has seen */
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2245
}
2246
}
2247
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
2257
}
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2279
}
2280
}
2281
2282
/* Removes the GPGME temp directory and all files inside */
1297
1298
/* Removes the temp directory used by GPGME */
2283
1299
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
2291
1320
char *fullname = NULL;
2292
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
1322
direntry->d_name);
2294
1323
if(ret < 0){
2295
perror_plus("asprintf");
1324
perror("asprintf");
2296
1325
continue;
2297
1326
}
2298
1327
ret = remove(fullname);
2299
1328
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
2302
1331
}
2303
1332
free(fullname);
2304
1333
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
1334
closedir(d);
2311
1335
}
2312
1336
ret = rmdir(tempdir);
2313
1337
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2315
}
2316
}
2317
2318
if(quit_now){
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2323
NULL));
2324
if(ret == -1){
2325
perror_plus("sigaction");
2326
}
2327
do {
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2330
if(ret != 0){
2331
perror_plus("raise");
2332
abort();
2333
}
2334
TEMP_FAILURE_RETRY(pause());
1338
perror("rmdir");
1339
}
2335
1340
}
2336
1341
2337
1342
return exitcode;
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Version: 2.0.2.dev0