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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:55:54 UTC
- Revision ID: teddy@recompile.se-20140310065554-of3kz8jdhlll42l3
Use "struct sockaddr_storage" instead of a union in mandos-client.
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
Apparently using struct sockaddr_storage the way POSIX intended is
incompatible with strict aliasing, so turn that off in the Makefile.
* plugins.d/mandos-client.c (start_mandos_communication): Change "to"
from a union
to a struct
sockaddr_storage.
* Makefile (OPTIMIZE): Add "-fno-strict-aliasing".
- files added:
- debian/mandos-client.examples
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
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() */
88
97
89
98
#ifdef __linux__
90
99
#include <sys/klog.h> /* klogctl() */
108
117
init_gnutls_session(),
109
118
GNUTLS_* */
110
119
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
122
114
123
/* GPGME */
115
124
#include <gpgme.h> /* All GPGME types, constants and
123
132
#define PATHDIR "/conf/conf.d/mandos"
124
133
#define SECKEY "seckey.txt"
125
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
136
127
137
bool debug = false;
128
138
static const char mandos_protocol_version[] = "1";
129
139
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
141
static const char sys_class_net[] = "/sys/class/net";
132
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
133
146
134
147
/* Doubly linked list that need to be circularly linked when used */
135
148
typedef struct server{
136
149
const char *ip;
137
uint16_t port;
150
in_port_t port;
138
151
AvahiIfIndex if_index;
139
152
int af;
140
153
struct timespec last_seen;
144
157
145
158
/* Used for passing in values through the Avahi callback functions */
146
159
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
160
AvahiServer *server;
149
161
gnutls_certificate_credentials_t cred;
150
162
unsigned int dh_bits;
152
164
const char *priority;
153
165
gpgme_ctx_t ctx;
154
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
155
169
} mandos_context;
156
170
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
162
173
163
174
sig_atomic_t quit_now = 0;
164
175
int signal_received = 0;
165
176
166
177
/* Function to use when printing errors */
167
178
void perror_plus(const char *print_text){
179
int e = errno;
168
180
fprintf(stderr, "Mandos plugin %s: ",
169
181
program_invocation_short_name);
182
errno = e;
170
183
perror(print_text);
171
184
}
172
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
173
196
/*
174
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
198
* bytes. "buffer_capacity" is how much is currently allocated,
176
199
* "buffer_length" is how much is already used.
177
200
*/
178
201
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
202
size_t buffer_capacity){
180
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
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;
183
210
return 0;
184
211
}
212
*buffer = new_buf;
185
213
buffer_capacity += BUFFER_SIZE;
186
214
}
187
215
return buffer_capacity;
188
216
}
189
217
190
218
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
194
221
int ret;
195
222
server *new_server = malloc(sizeof(server));
196
223
if(new_server == NULL){
197
224
perror_plus("malloc");
198
return -1;
225
return false;
199
226
}
200
227
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
228
.port = port,
229
.if_index = if_index,
230
.af = af };
204
231
if(new_server->ip == NULL){
205
232
perror_plus("strdup");
206
return -1;
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
207
239
}
208
240
/* Special case of first server */
209
if (mc.current_server == NULL){
241
if(*current_server == NULL){
210
242
new_server->next = new_server;
211
243
new_server->prev = new_server;
212
mc.current_server = new_server;
244
*current_server = new_server;
213
245
/* Place the new server last in the list */
214
246
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
217
249
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
250
(*current_server)->prev = new_server;
251
}
252
return true;
226
253
}
227
254
228
255
/*
229
256
* Initialize GPGME.
230
257
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
233
260
gpgme_error_t rc;
234
261
gpgme_engine_info_t engine_info;
235
262
236
237
263
/*
238
264
* Helper function to insert pub and seckey to the engine keyring.
239
265
*/
250
276
251
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
278
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
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));
255
281
return false;
256
282
}
257
283
258
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
259
285
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
262
288
return false;
263
289
}
264
290
271
297
}
272
298
273
299
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
300
fprintf_plus(stderr, "Initializing GPGME\n");
275
301
}
276
302
277
303
/* Init GPGME */
278
304
gpgme_check_version(NULL);
279
305
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
306
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
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));
283
309
return false;
284
310
}
285
311
286
312
/* Set GPGME home directory for the OpenPGP engine only */
287
313
rc = gpgme_get_engine_info(&engine_info);
288
314
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
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));
291
317
return false;
292
318
}
293
319
while(engine_info != NULL){
299
325
engine_info = engine_info->next;
300
326
}
301
327
if(engine_info == NULL){
302
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);
303
330
return false;
304
331
}
305
332
306
333
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
308
335
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
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));
311
339
return false;
312
340
}
313
341
324
352
*/
325
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
354
size_t crypto_size,
327
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
328
357
gpgme_data_t dh_crypto, dh_plain;
329
358
gpgme_error_t rc;
330
359
ssize_t ret;
332
361
ssize_t plaintext_length = 0;
333
362
334
363
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
365
}
337
366
338
367
/* Create new GPGME data buffer from memory cryptotext */
339
368
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
369
0);
341
370
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
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));
344
373
return -1;
345
374
}
346
375
347
376
/* Create new empty GPGME data buffer for the plaintext */
348
377
rc = gpgme_data_new(&dh_plain);
349
378
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
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));
352
382
gpgme_data_release(dh_crypto);
353
383
return -1;
354
384
}
355
385
356
386
/* Decrypt data from the cryptotext data buffer to the plaintext
357
387
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
389
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
362
392
plaintext_length = -1;
363
393
if(debug){
364
394
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
366
396
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
398
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
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);
373
403
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
405
}
376
406
gpgme_recipient_t recipient;
377
407
recipient = result->recipients;
378
408
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "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");
385
416
recipient = recipient->next;
386
417
}
387
418
}
390
421
}
391
422
392
423
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
425
}
395
426
396
427
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
434
*plaintext = NULL;
404
435
while(true){
405
436
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
437
(size_t)plaintext_length,
438
plaintext_capacity);
408
439
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
412
443
}
413
444
414
445
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
458
}
428
459
429
460
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
461
fprintf_plus(stderr, "Decrypted password is: ");
431
462
for(ssize_t i = 0; i < plaintext_length; i++){
432
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
464
}
445
476
}
446
477
447
478
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
450
480
if(ret == NULL)
451
481
ret = "(unknown)";
452
482
return ret;
455
485
/* GnuTLS log function callback */
456
486
static void debuggnutls(__attribute__((unused)) int level,
457
487
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
488
fprintf_plus(stderr, "GnuTLS: %s", string);
459
489
}
460
490
461
491
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
463
494
int ret;
464
495
465
496
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
498
}
468
499
469
500
ret = gnutls_global_init();
470
501
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
473
504
return -1;
474
505
}
475
506
482
513
}
483
514
484
515
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
517
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
489
520
gnutls_global_deinit();
490
521
return -1;
491
522
}
492
523
493
524
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
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);
497
529
}
498
530
499
531
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
501
533
GNUTLS_OPENPGP_FMT_BASE64);
502
534
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
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));
508
540
goto globalfail;
509
541
}
510
542
511
543
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
513
545
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
516
549
goto globalfail;
517
550
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
552
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
522
555
goto globalfail;
523
556
}
524
557
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
559
527
560
return 0;
528
561
529
562
globalfail:
530
563
531
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
532
565
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
534
567
return -1;
535
568
}
536
569
537
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
538
572
int ret;
539
573
/* GnuTLS session creation */
540
574
do {
544
578
}
545
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
580
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
549
584
}
550
585
551
586
{
552
587
const char *err;
553
588
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
590
if(quit_now){
556
591
gnutls_deinit(*session);
557
592
return -1;
558
593
}
559
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
595
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
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));
564
599
gnutls_deinit(*session);
565
600
return -1;
566
601
}
568
603
569
604
do {
570
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
606
mc->cred);
572
607
if(quit_now){
573
608
gnutls_deinit(*session);
574
609
return -1;
575
610
}
576
611
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
612
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
580
615
gnutls_deinit(*session);
581
616
return -1;
582
617
}
584
619
/* ignore client certificate if any. */
585
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
621
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
623
589
624
return 0;
590
625
}
594
629
__attribute__((unused)) const char *txt){}
595
630
596
631
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
598
633
AvahiIfIndex if_index,
599
int af){
634
int af, mandos_context *mc){
600
635
int ret, tcp_sd = -1;
601
636
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
637
struct sockaddr_storage to;
606
638
char *buffer = NULL;
607
639
char *decrypted_buffer = NULL;
608
640
size_t buffer_length = 0;
627
659
pf = PF_INET;
628
660
break;
629
661
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
663
errno = EINVAL;
632
664
return -1;
633
665
}
634
666
635
ret = init_gnutls_session(&session);
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
636
700
if(ret != 0){
637
701
return -1;
638
702
}
639
703
640
704
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
643
707
}
644
708
645
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
657
721
658
722
memset(&to, 0, sizeof(to));
659
723
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
662
726
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
665
729
}
666
730
if(ret < 0 ){
667
731
int e = errno;
671
735
}
672
736
if(ret == 0){
673
737
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
739
errno = e;
676
740
goto mandos_end;
677
741
}
678
742
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
686
746
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
689
749
errno = EINVAL;
690
750
goto mandos_end;
691
751
}
692
752
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
754
}
695
755
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
699
757
}
700
758
701
759
if(quit_now){
709
767
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
768
perror_plus("if_indextoname");
711
769
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
714
772
}
715
773
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
718
776
}
719
777
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
778
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
779
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
725
784
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
728
789
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
735
796
}
736
797
}
737
798
741
802
}
742
803
743
804
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
745
807
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
747
810
}
748
811
if(ret < 0){
749
812
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
764
827
while(true){
765
828
size_t out_size = strlen(out);
766
829
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
830
out_size - written));
768
831
if(ret == -1){
769
832
int e = errno;
770
833
perror_plus("write");
790
853
}
791
854
792
855
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
857
}
795
858
796
859
if(quit_now){
798
861
goto mandos_end;
799
862
}
800
863
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
869
804
870
if(quit_now){
805
871
errno = EINTR;
816
882
817
883
if(ret != GNUTLS_E_SUCCESS){
818
884
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
886
gnutls_perror(ret);
821
887
}
822
888
errno = EPROTO;
826
892
/* Read OpenPGP packet that contains the wanted password */
827
893
828
894
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
831
897
}
832
898
833
899
while(true){
838
904
}
839
905
840
906
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
907
buffer_capacity);
842
908
if(buffer_capacity == 0){
843
909
int e = errno;
844
910
perror_plus("incbuffer");
871
937
}
872
938
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
939
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
875
942
gnutls_perror(ret);
876
943
errno = EPROTO;
877
944
goto mandos_end;
878
945
}
879
946
break;
880
947
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
883
950
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
951
errno = EIO;
885
952
goto mandos_end;
890
957
}
891
958
892
959
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
960
fprintf_plus(stderr, "Closing TLS session\n");
894
961
}
895
962
896
963
if(quit_now){
908
975
909
976
if(buffer_length > 0){
910
977
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
914
980
if(decrypted_buffer_size >= 0){
915
981
916
982
written = 0;
926
992
if(ret == 0 and ferror(stdout)){
927
993
int e = errno;
928
994
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
931
997
}
932
998
errno = e;
933
999
goto mandos_end;
977
1043
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1044
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1045
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
982
1050
983
1051
/* Called whenever a service has been resolved successfully or
984
1052
timed out */
990
1058
switch(event){
991
1059
default:
992
1060
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
996
1066
break;
997
1067
998
1068
case AVAHI_RESOLVER_FOUND:
1000
1070
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1071
avahi_address_snprint(ip, sizeof(ip), address);
1002
1072
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
1006
1076
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1009
1081
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1082
avahi_simple_poll_quit(simple_poll);
1011
1083
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
1014
1090
}
1015
1091
}
1016
1092
}
1026
1102
const char *domain,
1027
1103
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1104
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1031
1109
1032
1110
/* Called whenever a new services becomes available on the LAN or
1033
1111
is removed from the LAN */
1040
1118
default:
1041
1119
case AVAHI_BROWSER_FAILURE:
1042
1120
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1046
1125
return;
1047
1126
1048
1127
case AVAHI_BROWSER_NEW:
1051
1130
the callback function is called the Avahi server will free the
1052
1131
resolver for us. */
1053
1132
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1059
1141
break;
1060
1142
1061
1143
case AVAHI_BROWSER_REMOVE:
1064
1146
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1147
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1148
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
1068
1151
}
1069
1152
break;
1070
1153
}
1079
1162
signal_received = sig;
1080
1163
int old_errno = errno;
1081
1164
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1084
1167
}
1085
1168
errno = old_errno;
1086
1169
}
1087
1170
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
int ret;
1173
error_t ret_errno;
1174
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
if(s < 0){
1177
ret_errno = errno;
1178
perror_plus("socket");
1179
errno = ret_errno;
1180
return false;
1181
}
1182
strcpy(ifr->ifr_name, ifname);
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
if(ret == -1){
1185
if(debug){
1186
ret_errno = errno;
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
}
1190
return false;
1191
}
1192
return true;
1193
}
1194
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1197
/* Reject the loopback device */
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1199
if(debug){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1202
}
1203
return false;
1204
}
1205
/* Accept point-to-point devices only if connect_to is specified */
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1207
if(debug){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1210
}
1211
return true;
1212
}
1213
/* Otherwise, reject non-broadcast-capable devices */
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1218
}
1219
return false;
1220
}
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
if(ifr->ifr_flags & IFF_NOARP){
1223
if(debug){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1226
}
1227
return false;
1228
}
1229
1230
/* Accept this device */
1231
if(debug){
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1233
}
1234
return true;
1235
}
1236
1088
1237
/*
1089
1238
* This function determines if a directory entry in /sys/class/net
1090
1239
* corresponds to an acceptable network device.
1091
1240
* (This function is passed to scandir(3) as a filter function.)
1092
1241
*/
1093
1242
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1243
if(if_entry->d_name[0] == '.'){
1097
1244
return 0;
1098
1245
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1246
1247
struct ifreq ifr;
1248
if(not get_flags(if_entry->d_name, &ifr)){
1249
if(debug){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
return 0;
1254
}
1255
1256
if(not good_flags(if_entry->d_name, &ifr)){
1257
return 0;
1189
1258
}
1190
1259
return 1;
1191
1260
}
1192
1261
1262
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1292
}
1293
1193
1294
int notdotentries(const struct dirent *direntry){
1194
1295
/* Skip "." and ".." */
1195
1296
if(direntry->d_name[0] == '.'
1201
1302
return 1;
1202
1303
}
1203
1304
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1305
/* Is this directory entry a runnable program? */
1306
int runnable_hook(const struct dirent *direntry){
1307
int ret;
1308
size_t sret;
1309
struct stat st;
1310
1311
if((direntry->d_name)[0] == '\0'){
1312
/* Empty name? */
1313
return 0;
1314
}
1315
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1318
"0123456789"
1319
"_-");
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1322
if(debug){
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1337
if(ret == -1){
1338
if(debug){
1339
perror_plus("Could not stat hook");
1340
}
1341
return 0;
1342
}
1343
if(not (S_ISREG(st.st_mode))){
1344
/* Not a regular file */
1345
if(debug){
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1348
}
1349
return 0;
1350
}
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
/* Not executable */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1363
return 1;
1364
}
1365
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1205
1368
int ret;
1206
1369
struct timespec now;
1207
1370
struct timespec waited_time;
1208
1371
intmax_t block_time;
1209
1372
1210
1373
while(true){
1211
if(mc.current_server == NULL){
1374
if(mc->current_server == NULL){
1212
1375
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1215
1378
}
1216
1379
ret = avahi_simple_poll_iterate(s, -1);
1217
1380
} else {
1218
1381
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1221
1384
}
1222
1385
/* the current time */
1223
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1391
/* Calculating in ms how long time between now and server
1229
1392
who we visted longest time ago. Now - last seen. */
1230
1393
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1394
- mc->current_server->last_seen.tv_sec);
1232
1395
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1396
- mc->current_server->last_seen.tv_nsec);
1234
1397
/* total time is 10s/10,000ms.
1235
1398
Converting to s from ms by dividing by 1,000,
1236
1399
and ns to ms by dividing by 1,000,000. */
1239
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1403
1241
1404
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1243
1407
}
1244
1408
1245
1409
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1250
1414
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1415
avahi_simple_poll_quit(s);
1252
1416
return 0;
1253
1417
}
1254
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1419
&mc->current_server->last_seen);
1256
1420
if(ret == -1){
1257
1421
perror_plus("clock_gettime");
1258
1422
return -1;
1259
1423
}
1260
mc.current_server = mc.current_server->next;
1424
mc->current_server = mc->current_server->next;
1261
1425
block_time = 0; /* Call avahi to find new Mandos
1262
1426
servers, but don't block */
1263
1427
}
1265
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1430
}
1267
1431
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1432
if (ret > 0 or errno != EINTR){
1269
1433
return (ret != 1) ? ret : 0;
1270
1434
}
1271
1435
}
1272
1436
}
1273
1437
}
1274
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1275
1794
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1276
1799
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1800
error_t ret_errno;
1278
1801
int ret;
1279
1802
intmax_t tmpmax;
1280
1803
char *tmp;
1281
1804
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1288
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1808
bool tempdir_created = false;
1290
1809
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1810
const char *seckey = PATHDIR "/" SECKEY;
1292
1811
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1293
1813
1294
1814
bool gnutls_initialized = false;
1295
1815
bool gpgme_initialized = false;
1357
1877
.group = 2 },
1358
1878
{ .name = "retry", .key = 132,
1359
1879
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1361
1885
.group = 2 },
1362
1886
/*
1363
1887
* These reproduce what we would get without ARGP_NO_HELP
1382
1906
connect_to = arg;
1383
1907
break;
1384
1908
case 'i': /* --interface */
1385
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1386
1914
break;
1387
1915
case 's': /* --seckey */
1388
1916
seckey = arg;
1417
1945
argp_error(state, "Bad retry interval");
1418
1946
}
1419
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1420
1951
/*
1421
1952
* These reproduce what we would get without ARGP_NO_HELP
1422
1953
*/
1428
1959
argp_state_help(state, state->out_stream,
1429
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1961
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1963
exit(argp_err_exit_status);
1433
1964
break;
1434
1965
default:
1461
1992
{
1462
1993
/* Work around Debian bug #633582:
1463
1994
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1995
1466
1996
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
1518
2078
}
1519
2079
}
1520
2080
1521
2081
if(not debug){
1522
2082
avahi_set_log_function(empty_log);
1523
2083
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2084
1550
2085
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2086
from the signal handler */
1552
2087
/* Initialize the pseudo-RNG for Avahi */
1553
2088
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
1557
2093
exitcode = EX_UNAVAILABLE;
1558
2094
goto end;
1559
2095
}
1621
2157
}
1622
2158
}
1623
2159
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
1709
2207
}
1710
2208
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
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
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2209
break;
1729
2210
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
2240
}
1768
2241
1769
2242
if(quit_now){
1770
2243
goto end;
1771
2244
}
1772
2245
1773
ret = init_gnutls_global(pubkey, seckey);
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2247
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2249
exitcode = EX_UNAVAILABLE;
1777
2250
goto end;
1778
2251
} else {
1793
2266
goto end;
1794
2267
}
1795
2268
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2271
exitcode = EX_UNAVAILABLE;
1799
2272
goto end;
1800
2273
} else {
1809
2282
/* Connect directly, do not use Zeroconf */
1810
2283
/* (Mainly meant for debugging) */
1811
2284
char *address = strrchr(connect_to, ':');
2285
1812
2286
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2287
fprintf_plus(stderr, "No colon in address\n");
1814
2288
exitcode = EX_USAGE;
1815
2289
goto end;
1816
2290
}
1819
2293
goto end;
1820
2294
}
1821
2295
1822
uint16_t port;
2296
in_port_t port;
1823
2297
errno = 0;
1824
2298
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2299
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
1828
2302
exitcode = EX_USAGE;
1829
2303
goto end;
1830
2304
}
1831
2305
1832
2306
if(quit_now){
1833
2307
goto end;
1834
2308
}
1835
2309
1836
port = (uint16_t)tmpmax;
2310
port = (in_port_t)tmpmax;
1837
2311
*address = '\0';
1838
2312
/* Colon in address indicates IPv6 */
1839
2313
int af;
1855
2329
}
1856
2330
1857
2331
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
1859
2334
if(quit_now or ret == 0){
1860
2335
break;
1861
2336
}
1862
2337
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
1865
2340
}
1866
sleep((int)retry_interval);
2341
sleep((unsigned int)retry_interval);
1867
2342
}
1868
2343
1869
2344
if (not quit_now){
1870
2345
exitcode = EXIT_SUCCESS;
1871
2346
}
1872
2347
1873
2348
goto end;
1874
2349
}
1875
2350
1887
2362
config.publish_domain = 0;
1888
2363
1889
2364
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
1893
2367
1894
2368
/* Free the Avahi configuration data */
1895
2369
avahi_server_config_free(&config);
1897
2371
1898
2372
/* Check if creating the Avahi server object succeeded */
1899
2373
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
1902
2376
exitcode = EX_UNAVAILABLE;
1903
2377
goto end;
1904
2378
}
1910
2384
/* Create the Avahi service browser */
1911
2385
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2386
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
1914
2389
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
1917
2392
exitcode = EX_UNAVAILABLE;
1918
2393
goto end;
1919
2394
}
1925
2400
/* Run the main loop */
1926
2401
1927
2402
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2404
}
1930
2405
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
1933
2408
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
1936
2411
}
1937
2412
1938
2413
end:
1939
2414
1940
2415
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2417
}
1943
2418
1944
2419
/* Cleanup things */
2420
free(mc.interfaces);
2421
1945
2422
if(sb != NULL)
1946
2423
avahi_s_service_browser_free(sb);
1947
2424
1948
2425
if(mc.server != NULL)
1949
2426
avahi_server_free(mc.server);
1950
2427
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
1953
2430
1954
2431
if(gnutls_initialized){
1955
2432
gnutls_certificate_free_credentials(mc.cred);
1960
2437
if(gpgme_initialized){
1961
2438
gpgme_release(mc.ctx);
1962
2439
}
1963
2440
1964
2441
/* Cleans up the circular linked list of Mandos servers the client
1965
2442
has seen */
1966
2443
if(mc.current_server != NULL){
1972
2449
}
1973
2450
}
1974
2451
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
1992
2470
}
1993
2471
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2003
2475
}
2004
2476
}
2477
2478
lower_privileges_permanently();
2005
2479
}
2006
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2007
2484
/* Removes the GPGME temp directory and all files inside */
2008
2485
if(tempdir_created){
2009
2486
struct dirent **direntries = NULL;
2022
2499
}
2023
2500
ret = remove(fullname);
2024
2501
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2027
2504
}
2028
2505
free(fullname);
2029
2506
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0