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- Committer: Teddy Hogeborn
- Date: 2014-03-09 03:02:43 UTC
- Revision ID: teddy@recompile.se-20140309030243-0gc6l2yuqbzgyuyt
Use getnameinfo() instead of inet_ntop() in mandos-client.
* plugins.d/mandos-client.c (start_mandos_communication): Use
getnameinfo()
instead of
inet_ntop().
* plugins.d/mandos-client.c (start_mandos_communication): Use
getnameinfo()
instead of
inet_ntop().
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
87
97
88
98
#ifdef __linux__
89
99
#include <sys/klog.h> /* klogctl() */
107
117
init_gnutls_session(),
108
118
GNUTLS_* */
109
119
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
112
122
113
123
/* GPGME */
114
124
#include <gpgme.h> /* All GPGME types, constants and
122
132
#define PATHDIR "/conf/conf.d/mandos"
123
133
#define SECKEY "seckey.txt"
124
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
136
126
137
bool debug = false;
127
138
static const char mandos_protocol_version[] = "1";
128
139
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
130
157
131
158
/* Used for passing in values through the Avahi callback functions */
132
159
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
160
AvahiServer *server;
135
161
gnutls_certificate_credentials_t cred;
136
162
unsigned int dh_bits;
137
163
gnutls_dh_params_t dh_params;
138
164
const char *priority;
139
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
140
169
} mandos_context;
141
170
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
146
173
147
174
sig_atomic_t quit_now = 0;
148
175
int signal_received = 0;
149
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
150
196
/*
151
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
198
* bytes. "buffer_capacity" is how much is currently allocated,
153
199
* "buffer_length" is how much is already used.
154
200
*/
155
201
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
202
size_t buffer_capacity){
157
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
160
210
return 0;
161
211
}
212
*buffer = new_buf;
162
213
buffer_capacity += BUFFER_SIZE;
163
214
}
164
215
return buffer_capacity;
165
216
}
166
217
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
/* Special case of first server */
236
if(*current_server == NULL){
237
new_server->next = new_server;
238
new_server->prev = new_server;
239
*current_server = new_server;
240
/* Place the new server last in the list */
241
} else {
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
244
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
246
}
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
248
if(ret == -1){
249
perror_plus("clock_gettime");
250
return false;
251
}
252
return true;
253
}
254
167
255
/*
168
256
* Initialize GPGME.
169
257
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
172
260
gpgme_error_t rc;
173
261
gpgme_engine_info_t engine_info;
174
262
175
176
263
/*
177
264
* Helper function to insert pub and seckey to the engine keyring.
178
265
*/
183
270
184
271
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
272
if(fd == -1){
186
perror("open");
273
perror_plus("open");
187
274
return false;
188
275
}
189
276
190
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
278
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
194
281
return false;
195
282
}
196
283
197
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
198
285
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
201
288
return false;
202
289
}
203
290
204
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
292
if(ret == -1){
206
perror("close");
293
perror_plus("close");
207
294
}
208
295
gpgme_data_release(pgp_data);
209
296
return true;
210
297
}
211
298
212
299
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
300
fprintf_plus(stderr, "Initializing GPGME\n");
214
301
}
215
302
216
303
/* Init GPGME */
217
304
gpgme_check_version(NULL);
218
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
306
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
222
309
return false;
223
310
}
224
311
225
/* Set GPGME home directory for the OpenPGP engine only */
312
/* Set GPGME home directory for the OpenPGP engine only */
226
313
rc = gpgme_get_engine_info(&engine_info);
227
314
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
230
317
return false;
231
318
}
232
319
while(engine_info != NULL){
238
325
engine_info = engine_info->next;
239
326
}
240
327
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
242
330
return false;
243
331
}
244
332
245
333
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
247
335
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
250
339
return false;
251
340
}
252
341
263
352
*/
264
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
354
size_t crypto_size,
266
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
267
357
gpgme_data_t dh_crypto, dh_plain;
268
358
gpgme_error_t rc;
269
359
ssize_t ret;
271
361
ssize_t plaintext_length = 0;
272
362
273
363
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
365
}
276
366
277
367
/* Create new GPGME data buffer from memory cryptotext */
278
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
369
0);
280
370
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
283
373
return -1;
284
374
}
285
375
286
376
/* Create new empty GPGME data buffer for the plaintext */
287
377
rc = gpgme_data_new(&dh_plain);
288
378
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
291
382
gpgme_data_release(dh_crypto);
292
383
return -1;
293
384
}
294
385
295
386
/* Decrypt data from the cryptotext data buffer to the plaintext
296
387
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
389
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
301
392
plaintext_length = -1;
302
393
if(debug){
303
394
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
305
396
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
398
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
312
403
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
405
}
315
406
gpgme_recipient_t recipient;
316
407
recipient = result->recipients;
317
408
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
324
416
recipient = recipient->next;
325
417
}
326
418
}
329
421
}
330
422
331
423
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
425
}
334
426
335
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
428
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
429
perror_plus("gpgme_data_seek");
338
430
plaintext_length = -1;
339
431
goto decrypt_end;
340
432
}
342
434
*plaintext = NULL;
343
435
while(true){
344
436
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
437
(size_t)plaintext_length,
438
plaintext_capacity);
347
439
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
351
443
}
352
444
353
445
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
450
break;
359
451
}
360
452
if(ret < 0){
361
perror("gpgme_data_read");
453
perror_plus("gpgme_data_read");
362
454
plaintext_length = -1;
363
455
goto decrypt_end;
364
456
}
366
458
}
367
459
368
460
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
370
462
for(ssize_t i = 0; i < plaintext_length; i++){
371
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
464
}
384
476
}
385
477
386
478
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
389
480
if(ret == NULL)
390
481
ret = "(unknown)";
391
482
return ret;
394
485
/* GnuTLS log function callback */
395
486
static void debuggnutls(__attribute__((unused)) int level,
396
487
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
398
489
}
399
490
400
491
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
402
494
int ret;
403
495
404
496
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
498
}
407
499
408
500
ret = gnutls_global_init();
409
501
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
412
504
return -1;
413
505
}
414
506
421
513
}
422
514
423
515
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
517
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
431
520
gnutls_global_deinit();
432
521
return -1;
433
522
}
434
523
435
524
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
439
529
}
440
530
441
531
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
443
533
GNUTLS_OPENPGP_FMT_BASE64);
444
534
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
450
540
goto globalfail;
451
541
}
452
542
453
543
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
455
545
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
458
549
goto globalfail;
459
550
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
552
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
464
555
goto globalfail;
465
556
}
466
557
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
559
469
560
return 0;
470
561
471
562
globalfail:
472
563
473
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
474
565
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
476
567
return -1;
477
568
}
478
569
479
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
480
572
int ret;
481
573
/* GnuTLS session creation */
482
574
do {
486
578
}
487
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
580
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
491
584
}
492
585
493
586
{
494
587
const char *err;
495
588
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
590
if(quit_now){
498
591
gnutls_deinit(*session);
499
592
return -1;
500
593
}
501
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
595
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
506
599
gnutls_deinit(*session);
507
600
return -1;
508
601
}
510
603
511
604
do {
512
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
606
mc->cred);
514
607
if(quit_now){
515
608
gnutls_deinit(*session);
516
609
return -1;
517
610
}
518
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
612
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
522
615
gnutls_deinit(*session);
523
616
return -1;
524
617
}
526
619
/* ignore client certificate if any. */
527
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
621
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
623
531
624
return 0;
532
625
}
536
629
__attribute__((unused)) const char *txt){}
537
630
538
631
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
540
633
AvahiIfIndex if_index,
541
int af){
634
int af, mandos_context *mc){
542
635
int ret, tcp_sd = -1;
543
636
ssize_t sret;
544
637
union {
569
662
pf = PF_INET;
570
663
break;
571
664
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
666
errno = EINVAL;
574
667
return -1;
575
668
}
576
669
577
ret = init_gnutls_session(&session);
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
578
703
if(ret != 0){
579
704
return -1;
580
705
}
581
706
582
707
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
585
710
}
586
711
587
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
713
if(tcp_sd < 0){
589
714
int e = errno;
590
perror("socket");
715
perror_plus("socket");
591
716
errno = e;
592
717
goto mandos_end;
593
718
}
607
732
}
608
733
if(ret < 0 ){
609
734
int e = errno;
610
perror("inet_pton");
735
perror_plus("inet_pton");
611
736
errno = e;
612
737
goto mandos_end;
613
738
}
614
739
if(ret == 0){
615
740
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
742
errno = e;
618
743
goto mandos_end;
619
744
}
620
745
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
625
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
628
756
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
631
759
errno = EINVAL;
632
760
goto mandos_end;
633
761
}
635
763
to.in6.sin6_scope_id = (uint32_t)if_index;
636
764
}
637
765
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
766
to.in.sin_port = htons(port);
641
767
}
642
768
643
769
if(quit_now){
649
775
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
776
char interface[IF_NAMESIZE];
651
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
778
perror_plus("if_indextoname");
653
779
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
656
782
}
657
783
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
660
786
}
661
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
789
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
667
793
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
670
797
}
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
804
}
678
805
}
679
806
688
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
816
}
690
817
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
694
823
goto mandos_end;
695
824
}
696
825
704
833
while(true){
705
834
size_t out_size = strlen(out);
706
835
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
836
out_size - written));
708
837
if(ret == -1){
709
838
int e = errno;
710
perror("write");
839
perror_plus("write");
711
840
errno = e;
712
841
goto mandos_end;
713
842
}
730
859
}
731
860
732
861
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
863
}
735
864
736
865
if(quit_now){
738
867
goto mandos_end;
739
868
}
740
869
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
742
875
743
876
if(quit_now){
744
877
errno = EINTR;
755
888
756
889
if(ret != GNUTLS_E_SUCCESS){
757
890
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
892
gnutls_perror(ret);
760
893
}
761
894
errno = EPROTO;
765
898
/* Read OpenPGP packet that contains the wanted password */
766
899
767
900
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
902
" %s\n", ip);
770
903
}
771
904
772
905
while(true){
777
910
}
778
911
779
912
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
913
buffer_capacity);
781
914
if(buffer_capacity == 0){
782
915
int e = errno;
783
perror("incbuffer");
916
perror_plus("incbuffer");
784
917
errno = e;
785
918
goto mandos_end;
786
919
}
810
943
}
811
944
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
945
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
947
"***\n");
814
948
gnutls_perror(ret);
815
949
errno = EPROTO;
816
950
goto mandos_end;
817
951
}
818
952
break;
819
953
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
822
956
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
957
errno = EIO;
824
958
goto mandos_end;
829
963
}
830
964
831
965
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
966
fprintf_plus(stderr, "Closing TLS session\n");
833
967
}
834
968
835
969
if(quit_now){
847
981
848
982
if(buffer_length > 0){
849
983
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
853
986
if(decrypted_buffer_size >= 0){
854
987
855
988
written = 0;
865
998
if(ret == 0 and ferror(stdout)){
866
999
int e = errno;
867
1000
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1002
strerror(errno));
870
1003
}
871
1004
errno = e;
872
1005
goto mandos_end;
891
1024
if(e == 0){
892
1025
e = errno;
893
1026
}
894
perror("close");
1027
perror_plus("close");
895
1028
}
896
1029
gnutls_deinit(session);
1030
errno = e;
897
1031
if(quit_now){
898
e = EINTR;
1032
errno = EINTR;
899
1033
retval = -1;
900
1034
}
901
errno = e;
902
1035
}
903
1036
return retval;
904
1037
}
916
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1051
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
921
1056
922
1057
/* Called whenever a service has been resolved successfully or
923
1058
timed out */
929
1064
switch(event){
930
1065
default:
931
1066
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1069
domain,
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
935
1072
break;
936
1073
937
1074
case AVAHI_RESOLVER_FOUND:
939
1076
char ip[AVAHI_ADDRESS_STR_MAX];
940
1077
avahi_address_snprint(ip, sizeof(ip), address);
941
1078
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1079
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1081
host_name, ip, (intmax_t)interface, port);
945
1082
}
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
948
1087
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
1088
avahi_simple_poll_quit(simple_poll);
1089
} else {
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1094
" list\n", name);
1095
}
950
1096
}
951
1097
}
952
1098
}
962
1108
const char *domain,
963
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1110
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
967
1115
968
1116
/* Called whenever a new services becomes available on the LAN or
969
1117
is removed from the LAN */
976
1124
default:
977
1125
case AVAHI_BROWSER_FAILURE:
978
1126
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
982
1131
return;
983
1132
984
1133
case AVAHI_BROWSER_NEW:
987
1136
the callback function is called the Avahi server will free the
988
1137
resolver for us. */
989
1138
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1144
" %s\n", name,
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
995
1147
break;
996
1148
997
1149
case AVAHI_BROWSER_REMOVE:
1000
1152
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1153
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1154
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1155
fprintf_plus(stderr, "No Mandos server found, still"
1156
" searching...\n");
1004
1157
}
1005
1158
break;
1006
1159
}
1007
1160
}
1008
1161
1009
/* stop main loop after sigterm has been called */
1162
/* Signal handler that stops main loop after SIGTERM */
1010
1163
static void handle_sigterm(int sig){
1011
1164
if(quit_now){
1012
1165
return;
1014
1167
quit_now = 1;
1015
1168
signal_received = sig;
1016
1169
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1170
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1173
}
1174
errno = old_errno;
1175
}
1176
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1178
int ret;
1179
error_t ret_errno;
1180
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1182
if(s < 0){
1183
ret_errno = errno;
1184
perror_plus("socket");
1185
errno = ret_errno;
1186
return false;
1187
}
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1190
if(ret == -1){
1191
if(debug){
1192
ret_errno = errno;
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1195
}
1196
return false;
1197
}
1198
return true;
1199
}
1200
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1202
1203
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1207
ifname);
1208
}
1209
return false;
1210
}
1211
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1213
if(debug){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1216
}
1217
return true;
1218
}
1219
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return false;
1226
}
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1231
ifname);
1232
}
1233
return false;
1234
}
1235
1236
/* Accept this device */
1237
if(debug){
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1239
}
1240
return true;
1241
}
1242
1243
/*
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1247
*/
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1250
return 0;
1251
}
1252
1253
struct ifreq ifr;
1254
if(not get_flags(if_entry->d_name, &ifr)){
1255
if(debug){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1258
}
1259
return 0;
1260
}
1261
1262
if(not good_flags(if_entry->d_name, &ifr)){
1263
return 0;
1264
}
1265
return 1;
1266
}
1267
1268
/*
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1298
}
1299
1300
int notdotentries(const struct dirent *direntry){
1301
/* Skip "." and ".." */
1302
if(direntry->d_name[0] == '.'
1303
and (direntry->d_name[1] == '\0'
1304
or (direntry->d_name[1] == '.'
1305
and direntry->d_name[2] == '\0'))){
1306
return 0;
1307
}
1308
return 1;
1309
}
1310
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1313
int ret;
1314
size_t sret;
1315
struct stat st;
1316
1317
if((direntry->d_name)[0] == '\0'){
1318
/* Empty name? */
1319
return 0;
1320
}
1321
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1324
"0123456789"
1325
"_-");
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1328
if(debug){
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1330
direntry->d_name);
1331
}
1332
return 0;
1333
}
1334
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1343
if(ret == -1){
1344
if(debug){
1345
perror_plus("Could not stat hook");
1346
}
1347
return 0;
1348
}
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1351
if(debug){
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1353
direntry->d_name);
1354
}
1355
return 0;
1356
}
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(debug){
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1367
direntry->d_name);
1368
}
1369
return 1;
1370
}
1371
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1374
int ret;
1375
struct timespec now;
1376
struct timespec waited_time;
1377
intmax_t block_time;
1378
1379
while(true){
1380
if(mc->current_server == NULL){
1381
if (debug){
1382
fprintf_plus(stderr, "Wait until first server is found."
1383
" No timeout!\n");
1384
}
1385
ret = avahi_simple_poll_iterate(s, -1);
1386
} else {
1387
if (debug){
1388
fprintf_plus(stderr, "Check current_server if we should run"
1389
" it, or wait\n");
1390
}
1391
/* the current time */
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1393
if(ret == -1){
1394
perror_plus("clock_gettime");
1395
return -1;
1396
}
1397
/* Calculating in ms how long time between now and server
1398
who we visted longest time ago. Now - last seen. */
1399
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1401
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1403
/* total time is 10s/10,000ms.
1404
Converting to s from ms by dividing by 1,000,
1405
and ns to ms by dividing by 1,000,000. */
1406
block_time = ((retry_interval
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1409
1410
if (debug){
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1412
block_time);
1413
}
1414
1415
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1420
if(ret == 0){
1421
avahi_simple_poll_quit(s);
1422
return 0;
1423
}
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1426
if(ret == -1){
1427
perror_plus("clock_gettime");
1428
return -1;
1429
}
1430
mc->current_server = mc->current_server->next;
1431
block_time = 0; /* Call avahi to find new Mandos
1432
servers, but don't block */
1433
}
1434
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1436
}
1437
if(ret != 0){
1438
if (ret > 0 or errno != EINTR){
1439
return (ret != 1) ? ret : 0;
1440
}
1441
}
1442
}
1443
}
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
1498
const float delay){
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
1502
if(numhooks == -1){
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
1520
perror_plus("asprintf");
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
1579
free(delaystring);
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
1591
} else {
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
1628
}
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1021
1798
}
1022
1799
1023
1800
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1024
1805
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1806
error_t ret_errno;
1026
1807
int ret;
1027
1808
intmax_t tmpmax;
1028
1809
char *tmp;
1029
1810
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1037
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1814
bool tempdir_created = false;
1039
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
1816
const char *seckey = PATHDIR "/" SECKEY;
1041
1817
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1042
1819
1043
1820
bool gnutls_initialized = false;
1044
1821
bool gpgme_initialized = false;
1045
1822
float delay = 2.5f;
1823
double retry_interval = 10; /* 10s between trying a server and
1824
retrying the same server again */
1046
1825
1047
1826
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1827
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1833
errno = 0;
1055
1834
ret = setgid(gid);
1056
1835
if(ret == -1){
1057
perror("setgid");
1836
perror_plus("setgid");
1058
1837
}
1059
1838
1060
1839
/* Lower user privileges (temporarily) */
1061
1840
errno = 0;
1062
1841
ret = seteuid(uid);
1063
1842
if(ret == -1){
1064
perror("seteuid");
1843
perror_plus("seteuid");
1065
1844
}
1066
1845
1067
1846
if(quit_now){
1102
1881
.arg = "SECONDS",
1103
1882
.doc = "Maximum delay to wait for interface startup",
1104
1883
.group = 2 },
1884
{ .name = "retry", .key = 132,
1885
.arg = "SECONDS",
1886
.doc = "Retry interval used when denied by the Mandos server",
1887
.group = 2 },
1888
{ .name = "network-hook-dir", .key = 133,
1889
.arg = "DIR",
1890
.doc = "Directory where network hooks are located",
1891
.group = 2 },
1105
1892
/*
1106
1893
* These reproduce what we would get without ARGP_NO_HELP
1107
1894
*/
1125
1912
connect_to = arg;
1126
1913
break;
1127
1914
case 'i': /* --interface */
1128
interface = arg;
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1129
1920
break;
1130
1921
case 's': /* --seckey */
1131
1922
seckey = arg;
1151
1942
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1943
argp_error(state, "Bad delay");
1153
1944
}
1945
case 132: /* --retry */
1946
errno = 0;
1947
retry_interval = strtod(arg, &tmp);
1948
if(errno != 0 or tmp == arg or *tmp != '\0'
1949
or (retry_interval * 1000) > INT_MAX
1950
or retry_interval < 0){
1951
argp_error(state, "Bad retry interval");
1952
}
1953
break;
1954
case 133: /* --network-hook-dir */
1955
hookdir = arg;
1154
1956
break;
1155
1957
/*
1156
1958
* These reproduce what we would get without ARGP_NO_HELP
1163
1965
argp_state_help(state, state->out_stream,
1164
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1967
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1969
exit(argp_err_exit_status);
1168
1970
break;
1169
1971
default:
1184
1986
case ENOMEM:
1185
1987
default:
1186
1988
errno = ret;
1187
perror("argp_parse");
1989
perror_plus("argp_parse");
1188
1990
exitcode = EX_OSERR;
1189
1991
goto end;
1190
1992
case EINVAL:
1192
1994
goto end;
1193
1995
}
1194
1996
}
1997
1998
{
1999
/* Work around Debian bug #633582:
2000
<http://bugs.debian.org/633582> */
2001
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2004
struct stat st;
2005
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2010
} else {
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2012
if(ret == -1){
2013
perror_plus("fstat");
2014
} else {
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2018
if(ret == -1){
2019
perror_plus("fchown");
2020
}
2021
}
2022
}
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2024
}
2025
}
2026
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2031
} else {
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2033
if(ret == -1){
2034
perror_plus("fstat");
2035
} else {
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2039
if(ret == -1){
2040
perror_plus("fchown");
2041
}
2042
}
2043
}
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2048
/* Lower privileges */
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
2066
}
2067
}
2068
}
2069
2070
/* Run network hooks */
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2076
goto end;
2077
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2085
}
1195
2086
1196
2087
if(not debug){
1197
2088
avahi_set_log_function(empty_log);
1201
2092
from the signal handler */
1202
2093
/* Initialize the pseudo-RNG for Avahi */
1203
2094
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
1207
2099
exitcode = EX_UNAVAILABLE;
1208
2100
goto end;
1209
2101
}
1211
2103
sigemptyset(&sigterm_action.sa_mask);
1212
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2105
if(ret == -1){
1214
perror("sigaddset");
2106
perror_plus("sigaddset");
1215
2107
exitcode = EX_OSERR;
1216
2108
goto end;
1217
2109
}
1218
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2111
if(ret == -1){
1220
perror("sigaddset");
2112
perror_plus("sigaddset");
1221
2113
exitcode = EX_OSERR;
1222
2114
goto end;
1223
2115
}
1224
2116
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2117
if(ret == -1){
1226
perror("sigaddset");
2118
perror_plus("sigaddset");
1227
2119
exitcode = EX_OSERR;
1228
2120
goto end;
1229
2121
}
1233
2125
*/
1234
2126
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2127
if(ret == -1){
1236
perror("sigaction");
2128
perror_plus("sigaction");
1237
2129
return EX_OSERR;
1238
2130
}
1239
2131
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2132
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2133
if(ret == -1){
1242
perror("sigaction");
2134
perror_plus("sigaction");
1243
2135
exitcode = EX_OSERR;
1244
2136
goto end;
1245
2137
}
1246
2138
}
1247
2139
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2140
if(ret == -1){
1249
perror("sigaction");
2141
perror_plus("sigaction");
1250
2142
return EX_OSERR;
1251
2143
}
1252
2144
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2145
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2146
if(ret == -1){
1255
perror("sigaction");
2147
perror_plus("sigaction");
1256
2148
exitcode = EX_OSERR;
1257
2149
goto end;
1258
2150
}
1259
2151
}
1260
2152
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2153
if(ret == -1){
1262
perror("sigaction");
2154
perror_plus("sigaction");
1263
2155
return EX_OSERR;
1264
2156
}
1265
2157
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2158
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2159
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
2160
perror_plus("sigaction");
2161
exitcode = EX_OSERR;
2162
goto end;
2163
}
2164
}
2165
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
1359
2213
}
1360
2214
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
2215
break;
1378
2216
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1416
2246
}
1417
2247
1418
2248
if(quit_now){
1419
2249
goto end;
1420
2250
}
1421
2251
1422
ret = init_gnutls_global(pubkey, seckey);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
1423
2253
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2255
exitcode = EX_UNAVAILABLE;
1426
2256
goto end;
1427
2257
} else {
1432
2262
goto end;
1433
2263
}
1434
2264
2265
if(mkdtemp(tempdir) == NULL){
2266
perror_plus("mkdtemp");
2267
goto end;
2268
}
1435
2269
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2270
1442
2271
if(quit_now){
1443
2272
goto end;
1444
2273
}
1445
2274
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2277
exitcode = EX_UNAVAILABLE;
1449
2278
goto end;
1450
2279
} else {
1459
2288
/* Connect directly, do not use Zeroconf */
1460
2289
/* (Mainly meant for debugging) */
1461
2290
char *address = strrchr(connect_to, ':');
2291
1462
2292
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2293
fprintf_plus(stderr, "No colon in address\n");
1464
2294
exitcode = EX_USAGE;
1465
2295
goto end;
1466
2296
}
1469
2299
goto end;
1470
2300
}
1471
2301
1472
uint16_t port;
2302
in_port_t port;
1473
2303
errno = 0;
1474
2304
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
1478
2308
exitcode = EX_USAGE;
1479
2309
goto end;
1480
2310
}
1481
2311
1482
2312
if(quit_now){
1483
2313
goto end;
1484
2314
}
1485
2315
1486
port = (uint16_t)tmpmax;
2316
port = (in_port_t)tmpmax;
1487
2317
*address = '\0';
1488
address = connect_to;
1489
2318
/* Colon in address indicates IPv6 */
1490
2319
int af;
1491
if(strchr(address, ':') != NULL){
2320
if(strchr(connect_to, ':') != NULL){
1492
2321
af = AF_INET6;
2322
/* Accept [] around IPv6 address - see RFC 5952 */
2323
if(connect_to[0] == '[' and address[-1] == ']')
2324
{
2325
connect_to++;
2326
address[-1] = '\0';
2327
}
1493
2328
} else {
1494
2329
af = AF_INET;
1495
2330
}
2331
address = connect_to;
1496
2332
1497
2333
if(quit_now){
1498
2334
goto end;
1499
2335
}
1500
2336
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2337
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2340
if(quit_now or ret == 0){
2341
break;
2342
}
2343
if(debug){
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2346
}
2347
sleep((unsigned int)retry_interval);
2348
}
2349
2350
if (not quit_now){
1523
2351
exitcode = EXIT_SUCCESS;
1524
2352
}
2353
1525
2354
goto end;
1526
2355
}
1527
2356
1539
2368
config.publish_domain = 0;
1540
2369
1541
2370
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
1545
2373
1546
2374
/* Free the Avahi configuration data */
1547
2375
avahi_server_config_free(&config);
1549
2377
1550
2378
/* Check if creating the Avahi server object succeeded */
1551
2379
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
1554
2382
exitcode = EX_UNAVAILABLE;
1555
2383
goto end;
1556
2384
}
1562
2390
/* Create the Avahi service browser */
1563
2391
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
1566
2395
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
1569
2398
exitcode = EX_UNAVAILABLE;
1570
2399
goto end;
1571
2400
}
1577
2406
/* Run the main loop */
1578
2407
1579
2408
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2410
}
2411
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2414
if(debug){
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
2417
}
1584
2418
1585
2419
end:
1586
2420
1587
2421
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2423
}
1590
2424
1591
2425
/* Cleanup things */
2426
free(mc.interfaces);
2427
1592
2428
if(sb != NULL)
1593
2429
avahi_s_service_browser_free(sb);
1594
2430
1595
2431
if(mc.server != NULL)
1596
2432
avahi_server_free(mc.server);
1597
2433
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
1600
2436
1601
2437
if(gnutls_initialized){
1602
2438
gnutls_certificate_free_credentials(mc.cred);
1608
2444
gpgme_release(mc.ctx);
1609
2445
}
1610
2446
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
2447
/* Cleans up the circular linked list of Mandos servers the client
2448
has seen */
2449
if(mc.current_server != NULL){
2450
mc.current_server->prev->next = NULL;
2451
while(mc.current_server != NULL){
2452
server *next = mc.current_server->next;
2453
free(mc.current_server);
2454
mc.current_server = next;
1618
2455
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2456
}
2457
2458
/* Re-raise priviliges */
2459
{
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
1628
2476
}
1629
2477
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
1639
2481
}
1640
2482
}
2483
2484
lower_privileges_permanently();
1641
2485
}
1642
2486
1643
/* Removes the temp directory used by GPGME */
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2489
2490
/* Removes the GPGME temp directory and all files inside */
1644
2491
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2492
struct dirent **direntries = NULL;
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
1665
2499
char *fullname = NULL;
1666
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2501
direntry->d_name);
1668
2502
if(ret < 0){
1669
perror("asprintf");
2503
perror_plus("asprintf");
1670
2504
continue;
1671
2505
}
1672
2506
ret = remove(fullname);
1673
2507
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
1676
2510
}
1677
2511
free(fullname);
1678
2512
}
1679
closedir(d);
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
1680
2519
}
1681
2520
ret = rmdir(tempdir);
1682
2521
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2522
perror_plus("rmdir");
1684
2523
}
1685
2524
}
1686
2525
1691
2530
&old_sigterm_action,
1692
2531
NULL));
1693
2532
if(ret == -1){
1694
perror("sigaction");
2533
perror_plus("sigaction");
1695
2534
}
1696
2535
do {
1697
2536
ret = raise(signal_received);
1698
2537
} while(ret != 0 and errno == EINTR);
1699
2538
if(ret != 0){
1700
perror("raise");
2539
perror_plus("raise");
1701
2540
abort();
1702
2541
}
1703
2542
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0