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237.7.148
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
50
53
sockaddr_in6, PF_INET6,
51
54
SOCK_STREAM, uid_t, gid_t, open(),
52
55
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
58
inet_pton(), connect() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
63
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
68
SIOCSIFFLAGS, if_indextoname(),
65
69
if_nametoindex(), IF_NAMESIZE */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
82
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
80
94
81
95
#ifdef __linux__
82
96
#include <sys/klog.h> /* klogctl() */
83
#endif
97
#endif /* __linux__ */
84
98
85
99
/* Avahi */
86
100
/* All Avahi types, constants and functions
100
114
init_gnutls_session(),
101
115
GNUTLS_* */
102
116
#include <gnutls/openpgp.h>
103
/* gnutls_certificate_set_openpgp_key_file(),
104
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
105
119
106
120
/* GPGME */
107
121
#include <gpgme.h> /* All GPGME types, constants and
115
129
#define PATHDIR "/conf/conf.d/mandos"
116
130
#define SECKEY "seckey.txt"
117
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
118
133
119
134
bool debug = false;
120
135
static const char mandos_protocol_version[] = "1";
121
136
const char *argp_program_version = "mandos-client " VERSION;
122
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
123
154
124
155
/* Used for passing in values through the Avahi callback functions */
125
156
typedef struct {
130
161
gnutls_dh_params_t dh_params;
131
162
const char *priority;
132
163
gpgme_ctx_t ctx;
164
server *current_server;
133
165
} mandos_context;
134
166
135
167
/* global context so signal handler can reach it*/
136
mandos_context mc;
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
172
173
sig_atomic_t quit_now = 0;
174
int signal_received = 0;
175
176
/* Function to use when printing errors */
177
void perror_plus(const char *print_text){
178
int e = errno;
179
fprintf(stderr, "Mandos plugin %s: ",
180
program_invocation_short_name);
181
errno = e;
182
perror(print_text);
183
}
184
185
__attribute__((format (gnu_printf, 2, 3)))
186
int fprintf_plus(FILE *stream, const char *format, ...){
187
va_list ap;
188
va_start (ap, format);
189
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
}
137
194
138
195
/*
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
197
* bytes. "buffer_capacity" is how much is currently allocated,
198
* "buffer_length" is how much is already used.
142
199
*/
143
200
size_t incbuffer(char **buffer, size_t buffer_length,
144
size_t buffer_capacity){
201
size_t buffer_capacity){
145
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
146
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
147
204
if(buffer == NULL){
152
209
return buffer_capacity;
153
210
}
154
211
212
/* Add server to set of servers to retry periodically */
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
215
int ret;
216
server *new_server = malloc(sizeof(server));
217
if(new_server == NULL){
218
perror_plus("malloc");
219
return false;
220
}
221
*new_server = (server){ .ip = strdup(ip),
222
.port = port,
223
.if_index = if_index,
224
.af = af };
225
if(new_server->ip == NULL){
226
perror_plus("strdup");
227
return false;
228
}
229
/* Special case of first server */
230
if (mc.current_server == NULL){
231
new_server->next = new_server;
232
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
235
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
238
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
245
}
246
return true;
247
}
248
155
249
/*
156
250
* Initialize GPGME.
157
251
*/
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
160
int ret;
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
161
254
gpgme_error_t rc;
162
255
gpgme_engine_info_t engine_info;
163
256
166
259
* Helper function to insert pub and seckey to the engine keyring.
167
260
*/
168
261
bool import_key(const char *filename){
262
int ret;
169
263
int fd;
170
264
gpgme_data_t pgp_data;
171
265
172
266
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
173
267
if(fd == -1){
174
perror("open");
268
perror_plus("open");
175
269
return false;
176
270
}
177
271
178
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
273
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
182
276
return false;
183
277
}
184
278
185
279
rc = gpgme_op_import(mc.ctx, pgp_data);
186
280
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
189
283
return false;
190
284
}
191
285
192
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
193
287
if(ret == -1){
194
perror("close");
288
perror_plus("close");
195
289
}
196
290
gpgme_data_release(pgp_data);
197
291
return true;
198
292
}
199
293
200
294
if(debug){
201
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
202
296
}
203
297
204
298
/* Init GPGME */
205
299
gpgme_check_version(NULL);
206
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
207
301
if(rc != GPG_ERR_NO_ERROR){
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
210
304
return false;
211
305
}
212
306
213
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
214
308
rc = gpgme_get_engine_info(&engine_info);
215
309
if(rc != GPG_ERR_NO_ERROR){
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
217
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
218
312
return false;
219
313
}
220
314
while(engine_info != NULL){
226
320
engine_info = engine_info->next;
227
321
}
228
322
if(engine_info == NULL){
229
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
230
325
return false;
231
326
}
232
327
233
328
/* Create new GPGME "context" */
234
329
rc = gpgme_new(&(mc.ctx));
235
330
if(rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
238
334
return false;
239
335
}
240
336
242
338
return false;
243
339
}
244
340
245
return true;
341
return true;
246
342
}
247
343
248
344
/*
259
355
ssize_t plaintext_length = 0;
260
356
261
357
if(debug){
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
263
359
}
264
360
265
361
/* Create new GPGME data buffer from memory cryptotext */
266
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
267
363
0);
268
364
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
271
367
return -1;
272
368
}
273
369
274
370
/* Create new empty GPGME data buffer for the plaintext */
275
371
rc = gpgme_data_new(&dh_plain);
276
372
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
279
376
gpgme_data_release(dh_crypto);
280
377
return -1;
281
378
}
284
381
data buffer */
285
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
383
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
289
386
plaintext_length = -1;
290
387
if(debug){
291
388
gpgme_decrypt_result_t result;
292
389
result = gpgme_op_decrypt_result(mc.ctx);
293
390
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
295
392
} else {
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
300
397
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
302
399
}
303
400
gpgme_recipient_t recipient;
304
401
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
402
while(recipient != NULL){
403
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
407
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
410
recipient = recipient->next;
315
411
}
316
412
}
317
413
}
319
415
}
320
416
321
417
if(debug){
322
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
323
419
}
324
420
325
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
326
422
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
327
perror("gpgme_data_seek");
423
perror_plus("gpgme_data_seek");
328
424
plaintext_length = -1;
329
425
goto decrypt_end;
330
426
}
332
428
*plaintext = NULL;
333
429
while(true){
334
430
plaintext_capacity = incbuffer(plaintext,
335
(size_t)plaintext_length,
336
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
337
433
if(plaintext_capacity == 0){
338
perror("incbuffer");
339
plaintext_length = -1;
340
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
341
437
}
342
438
343
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
348
444
break;
349
445
}
350
446
if(ret < 0){
351
perror("gpgme_data_read");
447
perror_plus("gpgme_data_read");
352
448
plaintext_length = -1;
353
449
goto decrypt_end;
354
450
}
356
452
}
357
453
358
454
if(debug){
359
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
360
456
for(ssize_t i = 0; i < plaintext_length; i++){
361
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
362
458
}
374
470
}
375
471
376
472
static const char * safer_gnutls_strerror(int value){
377
const char *ret = gnutls_strerror(value); /* Spurious warning from
378
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
379
474
if(ret == NULL)
380
475
ret = "(unknown)";
381
476
return ret;
384
479
/* GnuTLS log function callback */
385
480
static void debuggnutls(__attribute__((unused)) int level,
386
481
const char* string){
387
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
388
483
}
389
484
390
485
static int init_gnutls_global(const char *pubkeyfilename,
392
487
int ret;
393
488
394
489
if(debug){
395
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
396
491
}
397
492
398
493
ret = gnutls_global_init();
399
494
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
402
497
return -1;
403
498
}
404
499
411
506
}
412
507
413
508
/* OpenPGP credentials */
414
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
415
510
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
417
from
418
-Wunreachable-code
419
*/
420
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
421
513
gnutls_global_deinit();
422
514
return -1;
423
515
}
424
516
425
517
if(debug){
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
428
seckeyfilename);
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
429
522
}
430
523
431
524
ret = gnutls_certificate_set_openpgp_key_file
432
525
(mc.cred, pubkeyfilename, seckeyfilename,
433
526
GNUTLS_OPENPGP_FMT_BASE64);
434
527
if(ret != GNUTLS_E_SUCCESS){
435
fprintf(stderr,
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
438
fprintf(stderr, "The GnuTLS error is: %s\n",
439
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
safer_gnutls_strerror(ret));
440
533
goto globalfail;
441
534
}
442
535
443
536
/* GnuTLS server initialization */
444
537
ret = gnutls_dh_params_init(&mc.dh_params);
445
538
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
448
542
goto globalfail;
449
543
}
450
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
545
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
454
548
goto globalfail;
455
549
}
456
550
469
563
static int init_gnutls_session(gnutls_session_t *session){
470
564
int ret;
471
565
/* GnuTLS session creation */
472
ret = gnutls_init(session, GNUTLS_SERVER);
566
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
473
572
if(ret != GNUTLS_E_SUCCESS){
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
476
576
}
477
577
478
578
{
479
579
const char *err;
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
do {
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
481
587
if(ret != GNUTLS_E_SUCCESS){
482
fprintf(stderr, "Syntax error at: %s\n", err);
483
fprintf(stderr, "GnuTLS error: %s\n",
484
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
485
591
gnutls_deinit(*session);
486
592
return -1;
487
593
}
488
594
}
489
595
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
491
mc.cred);
596
do {
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc.cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
492
604
if(ret != GNUTLS_E_SUCCESS){
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
495
607
gnutls_deinit(*session);
496
608
return -1;
497
609
}
498
610
499
611
/* ignore client certificate if any. */
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
502
613
503
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
504
615
510
621
__attribute__((unused)) const char *txt){}
511
622
512
623
/* Called when a Mandos server is found */
513
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
514
625
AvahiIfIndex if_index,
515
626
int af){
516
int ret, tcp_sd;
627
int ret, tcp_sd = -1;
517
628
ssize_t sret;
518
629
union {
519
630
struct sockaddr_in in;
520
631
struct sockaddr_in6 in6;
521
632
} to;
522
633
char *buffer = NULL;
523
char *decrypted_buffer;
634
char *decrypted_buffer = NULL;
524
635
size_t buffer_length = 0;
525
636
size_t buffer_capacity = 0;
526
ssize_t decrypted_buffer_size;
527
637
size_t written;
528
int retval = 0;
638
int retval = -1;
529
639
gnutls_session_t session;
530
640
int pf; /* Protocol family */
531
641
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
532
649
switch(af){
533
650
case AF_INET6:
534
651
pf = PF_INET6;
537
654
pf = PF_INET;
538
655
break;
539
656
default:
540
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
541
659
return -1;
542
660
}
543
661
547
665
}
548
666
549
667
if(debug){
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
551
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
552
670
}
553
671
554
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
673
if(tcp_sd < 0){
556
perror("socket");
557
return -1;
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
677
goto mandos_end;
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
558
683
}
559
684
560
685
memset(&to, 0, sizeof(to));
561
686
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
687
to.in6.sin6_family = (sa_family_t)af;
563
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
689
} else { /* IPv4 */
565
690
to.in.sin_family = (sa_family_t)af;
566
691
ret = inet_pton(af, ip, &to.in.sin_addr);
567
692
}
568
693
if(ret < 0 ){
569
perror("inet_pton");
570
return -1;
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
697
goto mandos_end;
571
698
}
572
699
if(ret == 0){
573
fprintf(stderr, "Bad address: %s\n", ip);
574
return -1;
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
703
goto mandos_end;
575
704
}
576
705
if(af == AF_INET6){
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
578
-Wconversion and
579
-Wunreachable-code */
580
706
to.in6.sin6_port = htons(port);
581
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
582
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
583
-Wunreachable-code*/
709
-Wunreachable-code*/
584
710
if(if_index == AVAHI_IF_UNSPEC){
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
" without a network interface\n");
587
return -1;
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
714
goto mandos_end;
588
715
}
589
716
/* Set the network interface number as scope */
590
717
to.in6.sin6_scope_id = (uint32_t)if_index;
595
722
-Wunreachable-code */
596
723
}
597
724
725
if(quit_now){
726
errno = EINTR;
727
goto mandos_end;
728
}
729
598
730
if(debug){
599
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
732
char interface[IF_NAMESIZE];
601
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
602
perror("if_indextoname");
734
perror_plus("if_indextoname");
603
735
} else {
604
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
605
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
606
738
}
607
739
} else {
608
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
609
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
610
742
}
611
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
612
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
619
751
sizeof(addrstr));
620
752
}
621
753
if(pcret == NULL){
622
perror("inet_ntop");
754
perror_plus("inet_ntop");
623
755
} else {
624
756
if(strcmp(addrstr, ip) != 0){
625
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
626
758
}
627
759
}
628
760
}
629
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
630
767
if(af == AF_INET6){
631
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
769
} else {
633
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
634
771
}
635
772
if(ret < 0){
636
perror("connect");
637
return -1;
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
638
784
}
639
785
640
786
const char *out = mandos_protocol_version;
642
788
while(true){
643
789
size_t out_size = strlen(out);
644
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
645
out_size - written));
791
out_size - written));
646
792
if(ret == -1){
647
perror("write");
648
retval = -1;
793
int e = errno;
794
perror_plus("write");
795
errno = e;
649
796
goto mandos_end;
650
797
}
651
798
written += (size_t)ret;
659
806
break;
660
807
}
661
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
662
814
}
663
815
664
816
if(debug){
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
666
}
667
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
670
do{
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
824
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
836
do {
671
837
ret = gnutls_handshake(session);
838
if(quit_now){
839
errno = EINTR;
840
goto mandos_end;
841
}
672
842
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
673
843
674
844
if(ret != GNUTLS_E_SUCCESS){
675
845
if(debug){
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
677
847
gnutls_perror(ret);
678
848
}
679
retval = -1;
849
errno = EPROTO;
680
850
goto mandos_end;
681
851
}
682
852
683
853
/* Read OpenPGP packet that contains the wanted password */
684
854
685
855
if(debug){
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
687
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
688
858
}
689
859
690
860
while(true){
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
691
867
buffer_capacity = incbuffer(&buffer, buffer_length,
692
buffer_capacity);
868
buffer_capacity);
693
869
if(buffer_capacity == 0){
694
perror("incbuffer");
695
retval = -1;
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
873
goto mandos_end;
874
}
875
876
if(quit_now){
877
errno = EINTR;
696
878
goto mandos_end;
697
879
}
698
880
707
889
case GNUTLS_E_AGAIN:
708
890
break;
709
891
case GNUTLS_E_REHANDSHAKE:
710
do{
892
do {
711
893
ret = gnutls_handshake(session);
894
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
712
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
713
900
if(ret < 0){
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
715
903
gnutls_perror(ret);
716
retval = -1;
904
errno = EPROTO;
717
905
goto mandos_end;
718
906
}
719
907
break;
720
908
default:
721
fprintf(stderr, "Unknown error while reading data from"
722
" encrypted session with Mandos server\n");
723
retval = -1;
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
724
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
725
913
goto mandos_end;
726
914
}
727
915
} else {
730
918
}
731
919
732
920
if(debug){
733
fprintf(stderr, "Closing TLS session\n");
734
}
735
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
921
fprintf_plus(stderr, "Closing TLS session\n");
922
}
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
do {
930
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
931
if(quit_now){
932
errno = EINTR;
933
goto mandos_end;
934
}
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
737
936
738
937
if(buffer_length > 0){
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
740
buffer_length,
938
ssize_t decrypted_buffer_size;
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
741
940
&decrypted_buffer);
742
941
if(decrypted_buffer_size >= 0){
942
743
943
written = 0;
744
944
while(written < (size_t) decrypted_buffer_size){
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
745
950
ret = (int)fwrite(decrypted_buffer + written, 1,
746
951
(size_t)decrypted_buffer_size - written,
747
952
stdout);
748
953
if(ret == 0 and ferror(stdout)){
954
int e = errno;
749
955
if(debug){
750
fprintf(stderr, "Error writing encrypted data: %s\n",
751
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
752
958
}
753
retval = -1;
754
break;
959
errno = e;
960
goto mandos_end;
755
961
}
756
962
written += (size_t)ret;
757
963
}
758
free(decrypted_buffer);
759
} else {
760
retval = -1;
964
retval = 0;
761
965
}
762
} else {
763
retval = -1;
764
966
}
765
967
766
968
/* Shutdown procedure */
767
969
768
970
mandos_end:
769
free(buffer);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
971
{
972
int e = errno;
973
free(decrypted_buffer);
974
free(buffer);
975
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
977
}
978
if(ret == -1){
979
if(e == 0){
980
e = errno;
981
}
982
perror_plus("close");
983
}
984
gnutls_deinit(session);
985
errno = e;
986
if(quit_now){
987
errno = EINTR;
988
retval = -1;
989
}
773
990
}
774
gnutls_deinit(session);
775
991
return retval;
776
992
}
777
993
789
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
790
1006
flags,
791
1007
AVAHI_GCC_UNUSED void* userdata){
792
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
793
1011
794
1012
/* Called whenever a service has been resolved successfully or
795
1013
timed out */
796
1014
1015
if(quit_now){
1016
return;
1017
}
1018
797
1019
switch(event){
798
1020
default:
799
1021
case AVAHI_RESOLVER_FAILURE:
800
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
801
" of type '%s' in domain '%s': %s\n", name, type, domain,
802
avahi_strerror(avahi_server_errno(mc.server)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
803
1026
break;
804
1027
805
1028
case AVAHI_RESOLVER_FOUND:
807
1030
char ip[AVAHI_ADDRESS_STR_MAX];
808
1031
avahi_address_snprint(ip, sizeof(ip), address);
809
1032
if(debug){
810
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
1033
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1035
host_name, ip, (intmax_t)interface, port);
813
1036
}
814
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
815
1039
avahi_proto_to_af(proto));
816
1040
if(ret == 0){
817
1041
avahi_simple_poll_quit(mc.simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
818
1048
}
819
1049
}
820
1050
}
831
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
1062
flags,
833
1063
AVAHI_GCC_UNUSED void* userdata){
834
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
835
1067
836
1068
/* Called whenever a new services becomes available on the LAN or
837
1069
is removed from the LAN */
838
1070
1071
if(quit_now){
1072
return;
1073
}
1074
839
1075
switch(event){
840
1076
default:
841
1077
case AVAHI_BROWSER_FAILURE:
842
1078
843
fprintf(stderr, "(Avahi browser) %s\n",
844
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
845
1081
avahi_simple_poll_quit(mc.simple_poll);
846
1082
return;
847
1083
851
1087
the callback function is called the Avahi server will free the
852
1088
resolver for us. */
853
1089
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
855
protocol, name, type, domain,
856
AVAHI_PROTO_INET6, 0,
857
resolve_callback, NULL)))
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
859
name, avahi_strerror(avahi_server_errno(mc.server)));
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
860
1096
break;
861
1097
862
1098
case AVAHI_BROWSER_REMOVE:
865
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
866
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
867
1103
if(debug){
868
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
869
1106
}
870
1107
break;
871
1108
}
872
1109
}
873
1110
874
static void handle_sigterm(__attribute__((unused)) int sig){
1111
/* Signal handler that stops main loop after SIGTERM */
1112
static void handle_sigterm(int sig){
1113
if(quit_now){
1114
return;
1115
}
1116
quit_now = 1;
1117
signal_received = sig;
875
1118
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
877
errno = old_errno;
1119
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1122
}
1123
errno = old_errno;
1124
}
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1468
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1539
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1576
}
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
878
1748
}
879
1749
880
1750
int main(int argc, char *argv[]){
881
1751
AvahiSServiceBrowser *sb = NULL;
882
int error;
1752
error_t ret_errno;
883
1753
int ret;
884
1754
intmax_t tmpmax;
885
int numchars;
1755
char *tmp;
886
1756
int exitcode = EXIT_SUCCESS;
887
const char *interface = "eth0";
888
struct ifreq network;
889
int sd;
890
uid_t uid;
891
gid_t gid;
892
char *connect_to = NULL;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
893
1761
char tempdir[] = "/tmp/mandosXXXXXX";
894
1762
bool tempdir_created = false;
895
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
1764
const char *seckey = PATHDIR "/" SECKEY;
897
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
898
1768
899
/* Initialize Mandos context */
900
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
901
.dh_bits = 1024, .priority = "SECURE256"
902
":!CTYPE-X.509:+CTYPE-OPENPGP" };
903
1769
bool gnutls_initialized = false;
904
1770
bool gpgme_initialized = false;
905
double delay = 2.5;
906
907
struct sigaction old_sigterm_action;
1771
float delay = 2.5f;
1772
double retry_interval = 10; /* 10s between trying a server and
1773
retrying the same server again */
1774
1775
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
908
1776
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
909
1777
1778
uid = getuid();
1779
gid = getgid();
1780
1781
/* Lower any group privileges we might have, just to be safe */
1782
errno = 0;
1783
ret = setgid(gid);
1784
if(ret == -1){
1785
perror_plus("setgid");
1786
}
1787
1788
/* Lower user privileges (temporarily) */
1789
errno = 0;
1790
ret = seteuid(uid);
1791
if(ret == -1){
1792
perror_plus("seteuid");
1793
}
1794
1795
if(quit_now){
1796
goto end;
1797
}
1798
910
1799
{
911
1800
struct argp_option options[] = {
912
1801
{ .name = "debug", .key = 128,
941
1830
.arg = "SECONDS",
942
1831
.doc = "Maximum delay to wait for interface startup",
943
1832
.group = 2 },
1833
{ .name = "retry", .key = 132,
1834
.arg = "SECONDS",
1835
.doc = "Retry interval used when denied by the Mandos server",
1836
.group = 2 },
1837
{ .name = "network-hook-dir", .key = 133,
1838
.arg = "DIR",
1839
.doc = "Directory where network hooks are located",
1840
.group = 2 },
1841
/*
1842
* These reproduce what we would get without ARGP_NO_HELP
1843
*/
1844
{ .name = "help", .key = '?',
1845
.doc = "Give this help list", .group = -1 },
1846
{ .name = "usage", .key = -3,
1847
.doc = "Give a short usage message", .group = -1 },
1848
{ .name = "version", .key = 'V',
1849
.doc = "Print program version", .group = -1 },
944
1850
{ .name = NULL }
945
1851
};
946
1852
947
1853
error_t parse_opt(int key, char *arg,
948
1854
struct argp_state *state){
1855
errno = 0;
949
1856
switch(key){
950
1857
case 128: /* --debug */
951
1858
debug = true;
954
1861
connect_to = arg;
955
1862
break;
956
1863
case 'i': /* --interface */
957
interface = arg;
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
958
1869
break;
959
1870
case 's': /* --seckey */
960
1871
seckey = arg;
963
1874
pubkey = arg;
964
1875
break;
965
1876
case 129: /* --dh-bits */
966
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
967
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
968
or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad number of DH bits\n");
970
exit(EXIT_FAILURE);
1877
errno = 0;
1878
tmpmax = strtoimax(arg, &tmp, 10);
1879
if(errno != 0 or tmp == arg or *tmp != '\0'
1880
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1881
argp_error(state, "Bad number of DH bits");
971
1882
}
972
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
973
1884
break;
975
1886
mc.priority = arg;
976
1887
break;
977
1888
case 131: /* --delay */
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
980
fprintf(stderr, "Bad delay\n");
981
exit(EXIT_FAILURE);
982
}
983
break;
984
case ARGP_KEY_ARG:
985
argp_usage(state);
986
case ARGP_KEY_END:
1889
errno = 0;
1890
delay = strtof(arg, &tmp);
1891
if(errno != 0 or tmp == arg or *tmp != '\0'){
1892
argp_error(state, "Bad delay");
1893
}
1894
case 132: /* --retry */
1895
errno = 0;
1896
retry_interval = strtod(arg, &tmp);
1897
if(errno != 0 or tmp == arg or *tmp != '\0'
1898
or (retry_interval * 1000) > INT_MAX
1899
or retry_interval < 0){
1900
argp_error(state, "Bad retry interval");
1901
}
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
break;
1906
/*
1907
* These reproduce what we would get without ARGP_NO_HELP
1908
*/
1909
case '?': /* --help */
1910
argp_state_help(state, state->out_stream,
1911
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1912
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1913
case -3: /* --usage */
1914
argp_state_help(state, state->out_stream,
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1916
case 'V': /* --version */
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1918
exit(argp_err_exit_status);
987
1919
break;
988
1920
default:
989
1921
return ARGP_ERR_UNKNOWN;
990
1922
}
991
return 0;
1923
return errno;
992
1924
}
993
1925
994
1926
struct argp argp = { .options = options, .parser = parse_opt,
995
1927
.args_doc = "",
996
1928
.doc = "Mandos client -- Get and decrypt"
997
1929
" passwords from a Mandos server" };
998
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
999
if(ret == ARGP_ERR_UNKNOWN){
1000
fprintf(stderr, "Unknown error while parsing arguments\n");
1001
exitcode = EXIT_FAILURE;
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
1933
case 0:
1934
break;
1935
case ENOMEM:
1936
default:
1937
errno = ret;
1938
perror_plus("argp_parse");
1939
exitcode = EX_OSERR;
1940
goto end;
1941
case EINVAL:
1942
exitcode = EX_USAGE;
1002
1943
goto end;
1003
1944
}
1004
1945
}
1005
1006
/* If the interface is down, bring it up */
1007
if(interface[0] != '\0'){
1008
#ifdef __linux__
1009
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
messages to mess up the prompt */
1011
ret = klogctl(8, NULL, 5);
1012
bool restore_loglevel = true;
1013
if(ret == -1){
1014
restore_loglevel = false;
1015
perror("klogctl");
1016
}
1017
#endif
1018
1019
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1020
if(sd < 0){
1021
perror("socket");
1022
exitcode = EXIT_FAILURE;
1023
#ifdef __linux__
1024
if(restore_loglevel){
1025
ret = klogctl(7, NULL, 0);
1026
if(ret == -1){
1027
perror("klogctl");
1028
}
1029
}
1030
#endif
1031
goto end;
1032
}
1033
strcpy(network.ifr_name, interface);
1034
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1035
if(ret == -1){
1036
perror("ioctl SIOCGIFFLAGS");
1037
#ifdef __linux__
1038
if(restore_loglevel){
1039
ret = klogctl(7, NULL, 0);
1040
if(ret == -1){
1041
perror("klogctl");
1042
}
1043
}
1044
#endif
1045
exitcode = EXIT_FAILURE;
1046
goto end;
1047
}
1048
if((network.ifr_flags & IFF_UP) == 0){
1049
network.ifr_flags |= IFF_UP;
1050
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1946
1947
{
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
1051
2000
if(ret == -1){
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1054
#ifdef __linux__
1055
if(restore_loglevel){
1056
ret = klogctl(7, NULL, 0);
1057
if(ret == -1){
1058
perror("klogctl");
1059
}
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
1060
2015
}
1061
#endif
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
2019
}
2020
}
2021
2022
/* Run network hooks */
2023
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2027
if(interfaces_hooks == NULL){
2028
perror_plus("malloc");
1062
2029
goto end;
1063
2030
}
1064
}
1065
/* sleep checking until interface is running */
1066
for(int i=0; i < delay * 4; i++){
1067
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1068
if(ret == -1){
1069
perror("ioctl SIOCGIFFLAGS");
1070
} else if(network.ifr_flags & IFF_RUNNING){
1071
break;
1072
}
1073
struct timespec sleeptime = { .tv_nsec = 250000000 };
1074
ret = nanosleep(&sleeptime, NULL);
1075
if(ret == -1 and errno != EINTR){
1076
perror("nanosleep");
1077
}
1078
}
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1080
if(ret == -1){
1081
perror("close");
1082
}
1083
#ifdef __linux__
1084
if(restore_loglevel){
1085
/* Restores kernel loglevel to default */
1086
ret = klogctl(7, NULL, 0);
1087
if(ret == -1){
1088
perror("klogctl");
1089
}
1090
}
1091
#endif
1092
}
1093
1094
uid = getuid();
1095
gid = getgid();
1096
1097
errno = 0;
1098
setgid(gid);
1099
if(ret == -1){
1100
perror("setgid");
1101
}
1102
1103
ret = setuid(uid);
1104
if(ret == -1){
1105
perror("setuid");
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2040
}
2041
2042
if(not debug){
2043
avahi_set_log_function(empty_log);
2044
}
2045
2046
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2047
from the signal handler */
2048
/* Initialize the pseudo-RNG for Avahi */
2049
srand((unsigned int) time(NULL));
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2052
fprintf_plus(stderr,
2053
"Avahi: Failed to create simple poll object.\n");
2054
exitcode = EX_UNAVAILABLE;
2055
goto end;
2056
}
2057
2058
sigemptyset(&sigterm_action.sa_mask);
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2060
if(ret == -1){
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
2063
goto end;
2064
}
2065
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2066
if(ret == -1){
2067
perror_plus("sigaddset");
2068
exitcode = EX_OSERR;
2069
goto end;
2070
}
2071
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2072
if(ret == -1){
2073
perror_plus("sigaddset");
2074
exitcode = EX_OSERR;
2075
goto end;
2076
}
2077
/* Need to check if the handler is SIG_IGN before handling:
2078
| [[info:libc:Initial Signal Actions]] |
2079
| [[info:libc:Basic Signal Handling]] |
2080
*/
2081
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2082
if(ret == -1){
2083
perror_plus("sigaction");
2084
return EX_OSERR;
2085
}
2086
if(old_sigterm_action.sa_handler != SIG_IGN){
2087
ret = sigaction(SIGINT, &sigterm_action, NULL);
2088
if(ret == -1){
2089
perror_plus("sigaction");
2090
exitcode = EX_OSERR;
2091
goto end;
2092
}
2093
}
2094
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2095
if(ret == -1){
2096
perror_plus("sigaction");
2097
return EX_OSERR;
2098
}
2099
if(old_sigterm_action.sa_handler != SIG_IGN){
2100
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2101
if(ret == -1){
2102
perror_plus("sigaction");
2103
exitcode = EX_OSERR;
2104
goto end;
2105
}
2106
}
2107
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2108
if(ret == -1){
2109
perror_plus("sigaction");
2110
return EX_OSERR;
2111
}
2112
if(old_sigterm_action.sa_handler != SIG_IGN){
2113
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2114
if(ret == -1){
2115
perror_plus("sigaction");
2116
exitcode = EX_OSERR;
2117
goto end;
2118
}
2119
}
2120
2121
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2124
/* Look for any good interfaces */
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2126
alphasort);
2127
if(ret >= 1){
2128
/* Add all found interfaces to interfaces list */
2129
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2131
direntries[i]->d_name);
2132
if(ret_errno != 0){
2133
perror_plus("argz_add");
2134
continue;
2135
}
2136
if(debug){
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
direntries[i]->d_name);
2139
}
2140
}
2141
free(direntries);
2142
} else {
2143
free(direntries);
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2145
exitcode = EXIT_FAILURE;
2146
goto end;
2147
}
2148
}
2149
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2162
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2164
interface))){
2165
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2167
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2171
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2175
}
2176
}
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
if(debug and (interfaces_to_take_down == NULL)){
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
}
2184
}
2185
2186
if(quit_now){
2187
goto end;
1106
2188
}
1107
2189
1108
2190
ret = init_gnutls_global(pubkey, seckey);
1109
2191
if(ret == -1){
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
exitcode = EX_UNAVAILABLE;
1112
2194
goto end;
1113
2195
} else {
1114
2196
gnutls_initialized = true;
1115
2197
}
1116
2198
2199
if(quit_now){
2200
goto end;
2201
}
2202
1117
2203
if(mkdtemp(tempdir) == NULL){
1118
perror("mkdtemp");
2204
perror_plus("mkdtemp");
1119
2205
goto end;
1120
2206
}
1121
2207
tempdir_created = true;
1122
2208
2209
if(quit_now){
2210
goto end;
2211
}
2212
1123
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2215
exitcode = EX_UNAVAILABLE;
1126
2216
goto end;
1127
2217
} else {
1128
2218
gpgme_initialized = true;
1129
2219
}
1130
2220
1131
if(interface[0] != '\0'){
1132
if_index = (AvahiIfIndex) if_nametoindex(interface);
1133
if(if_index == 0){
1134
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
2221
if(quit_now){
2222
goto end;
1138
2223
}
1139
2224
1140
2225
if(connect_to != NULL){
1141
2226
/* Connect directly, do not use Zeroconf */
1142
2227
/* (Mainly meant for debugging) */
1143
2228
char *address = strrchr(connect_to, ':');
2229
1144
2230
if(address == NULL){
1145
fprintf(stderr, "No colon in address\n");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
uint16_t port;
1150
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1151
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1152
or address[numchars+1] != '\0'){
1153
fprintf(stderr, "Bad port number\n");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
port = (uint16_t)tmpmax;
2231
fprintf_plus(stderr, "No colon in address\n");
2232
exitcode = EX_USAGE;
2233
goto end;
2234
}
2235
2236
if(quit_now){
2237
goto end;
2238
}
2239
2240
in_port_t port;
2241
errno = 0;
2242
tmpmax = strtoimax(address+1, &tmp, 10);
2243
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2244
or tmpmax != (in_port_t)tmpmax){
2245
fprintf_plus(stderr, "Bad port number\n");
2246
exitcode = EX_USAGE;
2247
goto end;
2248
}
2249
2250
if(quit_now){
2251
goto end;
2252
}
2253
2254
port = (in_port_t)tmpmax;
1158
2255
*address = '\0';
1159
address = connect_to;
1160
2256
/* Colon in address indicates IPv6 */
1161
2257
int af;
1162
if(strchr(address, ':') != NULL){
2258
if(strchr(connect_to, ':') != NULL){
1163
2259
af = AF_INET6;
2260
/* Accept [] around IPv6 address - see RFC 5952 */
2261
if(connect_to[0] == '[' and address[-1] == ']')
2262
{
2263
connect_to++;
2264
address[-1] = '\0';
2265
}
1164
2266
} else {
1165
2267
af = AF_INET;
1166
2268
}
1167
ret = start_mandos_communication(address, port, if_index, af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
2269
address = connect_to;
2270
2271
if(quit_now){
2272
goto end;
2273
}
2274
2275
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
2277
if(quit_now or ret == 0){
2278
break;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
(int)retry_interval);
2283
}
2284
sleep((int)retry_interval);
2285
}
2286
2287
if (not quit_now){
1171
2288
exitcode = EXIT_SUCCESS;
1172
2289
}
2290
1173
2291
goto end;
1174
2292
}
1175
2293
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
2294
if(quit_now){
1188
2295
goto end;
1189
2296
}
1190
2297
1200
2307
/* Allocate a new server */
1201
2308
mc.server = avahi_server_new(avahi_simple_poll_get
1202
2309
(mc.simple_poll), &config, NULL,
1203
NULL, &error);
2310
NULL, &ret_errno);
1204
2311
1205
2312
/* Free the Avahi configuration data */
1206
2313
avahi_server_config_free(&config);
1208
2315
1209
2316
/* Check if creating the Avahi server object succeeded */
1210
2317
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
2320
exitcode = EX_UNAVAILABLE;
2321
goto end;
2322
}
2323
2324
if(quit_now){
1214
2325
goto end;
1215
2326
}
1216
2327
1217
2328
/* Create the Avahi service browser */
1218
2329
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1220
2331
NULL, 0, browse_callback, NULL);
1221
2332
if(sb == NULL){
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
avahi_strerror(avahi_server_errno(mc.server)));
2335
exitcode = EX_UNAVAILABLE;
1225
2336
goto end;
1226
2337
}
1227
2338
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
2339
if(quit_now){
1233
2340
goto end;
1234
2341
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1241
2342
1242
2343
/* Run the main loop */
1243
2344
1244
2345
if(debug){
1245
fprintf(stderr, "Starting Avahi loop search\n");
1246
}
1247
1248
avahi_simple_poll_loop(mc.simple_poll);
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2351
if(debug){
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
(ret == 0) ? "successfully" : "with error");
2354
}
1249
2355
1250
2356
end:
1251
2357
1252
2358
if(debug){
1253
fprintf(stderr, "%s exiting\n", argv[0]);
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1254
2360
}
1255
2361
1256
2362
/* Cleanup things */
1273
2379
gpgme_release(mc.ctx);
1274
2380
}
1275
2381
1276
/* Removes the temp directory used by GPGME */
2382
/* Cleans up the circular linked list of Mandos servers the client
2383
has seen */
2384
if(mc.current_server != NULL){
2385
mc.current_server->prev->next = NULL;
2386
while(mc.current_server != NULL){
2387
server *next = mc.current_server->next;
2388
free(mc.current_server);
2389
mc.current_server = next;
2390
}
2391
}
2392
2393
/* Re-raise priviliges */
2394
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
2420
}
2421
2422
free(interfaces_to_take_down);
2423
free(interfaces_hooks);
2424
2425
/* Removes the GPGME temp directory and all files inside */
1277
2426
if(tempdir_created){
1278
DIR *d;
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1281
if(d == NULL){
1282
if(errno != ENOENT){
1283
perror("opendir");
1284
}
1285
} else {
1286
while(true){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1289
break;
1290
}
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
continue;
1297
}
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
1298
2434
char *fullname = NULL;
1299
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
2436
direntry->d_name);
1301
2437
if(ret < 0){
1302
perror("asprintf");
2438
perror_plus("asprintf");
1303
2439
continue;
1304
2440
}
1305
2441
ret = remove(fullname);
1306
2442
if(ret == -1){
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1308
strerror(errno));
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
1309
2445
}
1310
2446
free(fullname);
1311
2447
}
1312
closedir(d);
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
1313
2454
}
1314
2455
ret = rmdir(tempdir);
1315
2456
if(ret == -1 and errno != ENOENT){
1316
perror("rmdir");
1317
}
2457
perror_plus("rmdir");
2458
}
2459
}
2460
2461
if(quit_now){
2462
sigemptyset(&old_sigterm_action.sa_mask);
2463
old_sigterm_action.sa_handler = SIG_DFL;
2464
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2465
&old_sigterm_action,
2466
NULL));
2467
if(ret == -1){
2468
perror_plus("sigaction");
2469
}
2470
do {
2471
ret = raise(signal_received);
2472
} while(ret != 0 and errno == EINTR);
2473
if(ret != 0){
2474
perror_plus("raise");
2475
abort();
2476
}
2477
TEMP_FAILURE_RETRY(pause());
1318
2478
}
1319
2479
1320
2480
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0