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- Committer: Teddy Hogeborn
- Date: 2014-03-28 22:32:21 UTC
- Revision ID: teddy@recompile.se-20140328223221-w579qlvlex5if3dn
Fix location and format of signing key file.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
- files added:
- debian/mandos-client.examples
- debian/upstream
- 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
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() */
55
55
opendir(), DIR */
56
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,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
129
136
130
137
bool debug = false;
131
138
static const char mandos_protocol_version[] = "1";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
137
146
138
147
/* Doubly linked list that need to be circularly linked when used */
139
148
typedef struct server{
140
149
const char *ip;
141
uint16_t port;
150
in_port_t port;
142
151
AvahiIfIndex if_index;
143
152
int af;
144
153
struct timespec last_seen;
148
157
149
158
/* Used for passing in values through the Avahi callback functions */
150
159
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
160
AvahiServer *server;
153
161
gnutls_certificate_credentials_t cred;
154
162
unsigned int dh_bits;
156
164
const char *priority;
157
165
gpgme_ctx_t ctx;
158
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
159
169
} mandos_context;
160
170
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
166
173
167
174
sig_atomic_t quit_now = 0;
168
175
int signal_received = 0;
169
176
170
177
/* Function to use when printing errors */
171
178
void perror_plus(const char *print_text){
179
int e = errno;
172
180
fprintf(stderr, "Mandos plugin %s: ",
173
181
program_invocation_short_name);
182
errno = e;
174
183
perror(print_text);
175
184
}
176
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
187
int fprintf_plus(FILE *stream, const char *format, ...){
178
188
va_list ap;
179
189
va_start (ap, format);
180
190
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
194
}
184
195
185
196
/*
187
198
* bytes. "buffer_capacity" is how much is currently allocated,
188
199
* "buffer_length" is how much is already used.
189
200
*/
201
__attribute__((nonnull, warn_unused_result))
190
202
size_t incbuffer(char **buffer, size_t buffer_length,
191
203
size_t buffer_capacity){
192
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
195
211
return 0;
196
212
}
213
*buffer = new_buf;
197
214
buffer_capacity += BUFFER_SIZE;
198
215
}
199
216
return buffer_capacity;
200
217
}
201
218
202
219
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
205
223
int ret;
206
224
server *new_server = malloc(sizeof(server));
207
225
if(new_server == NULL){
208
226
perror_plus("malloc");
209
return -1;
227
return false;
210
228
}
211
229
*new_server = (server){ .ip = strdup(ip),
212
230
.port = port,
214
232
.af = af };
215
233
if(new_server->ip == NULL){
216
234
perror_plus("strdup");
217
return -1;
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
218
241
}
219
242
/* Special case of first server */
220
if (mc.current_server == NULL){
243
if(*current_server == NULL){
221
244
new_server->next = new_server;
222
245
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
246
*current_server = new_server;
225
247
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
228
251
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
252
(*current_server)->prev = new_server;
253
}
254
return true;
237
255
}
238
256
239
257
/*
240
258
* Initialize GPGME.
241
259
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
244
265
gpgme_error_t rc;
245
266
gpgme_engine_info_t engine_info;
246
267
247
248
268
/*
249
269
* Helper function to insert pub and seckey to the engine keyring.
250
270
*/
251
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
252
272
int ret;
253
273
int fd;
254
274
gpgme_data_t pgp_data;
262
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
283
if(rc != GPG_ERR_NO_ERROR){
264
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
285
gpgme_strsource(rc), gpgme_strerror(rc));
266
286
return false;
267
287
}
268
288
269
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
270
290
if(rc != GPG_ERR_NO_ERROR){
271
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
292
gpgme_strsource(rc), gpgme_strerror(rc));
273
293
return false;
274
294
}
275
295
290
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
311
if(rc != GPG_ERR_NO_ERROR){
292
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
313
gpgme_strsource(rc), gpgme_strerror(rc));
294
314
return false;
295
315
}
296
316
298
318
rc = gpgme_get_engine_info(&engine_info);
299
319
if(rc != GPG_ERR_NO_ERROR){
300
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
321
gpgme_strsource(rc), gpgme_strerror(rc));
302
322
return false;
303
323
}
304
324
while(engine_info != NULL){
310
330
engine_info = engine_info->next;
311
331
}
312
332
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
314
335
return false;
315
336
}
316
337
317
338
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
319
340
if(rc != GPG_ERR_NO_ERROR){
320
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
323
344
return false;
324
345
}
325
346
334
355
* Decrypt OpenPGP data.
335
356
* Returns -1 on error
336
357
*/
358
__attribute__((nonnull, warn_unused_result))
337
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
338
360
size_t crypto_size,
339
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
340
363
gpgme_data_t dh_crypto, dh_plain;
341
364
gpgme_error_t rc;
342
365
ssize_t ret;
352
375
0);
353
376
if(rc != GPG_ERR_NO_ERROR){
354
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
378
gpgme_strsource(rc), gpgme_strerror(rc));
356
379
return -1;
357
380
}
358
381
360
383
rc = gpgme_data_new(&dh_plain);
361
384
if(rc != GPG_ERR_NO_ERROR){
362
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
365
388
gpgme_data_release(dh_crypto);
366
389
return -1;
367
390
}
368
391
369
392
/* Decrypt data from the cryptotext data buffer to the plaintext
370
393
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
395
if(rc != GPG_ERR_NO_ERROR){
373
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
gpgme_strsource(rc), gpgme_strerror(rc));
397
gpgme_strsource(rc), gpgme_strerror(rc));
375
398
plaintext_length = -1;
376
399
if(debug){
377
400
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
379
402
if(result == NULL){
380
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
404
} else {
382
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
383
result->unsupported_algorithm);
406
result->unsupported_algorithm);
384
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
385
result->wrong_key_usage);
408
result->wrong_key_usage);
386
409
if(result->file_name != NULL){
387
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
388
411
}
390
413
recipient = result->recipients;
391
414
while(recipient != NULL){
392
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
394
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
419
fprintf_plus(stderr, "Secret key available: %s\n",
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
398
422
recipient = recipient->next;
399
423
}
400
424
}
457
481
return plaintext_length;
458
482
}
459
483
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
463
487
if(ret == NULL)
464
488
ret = "(unknown)";
465
489
return ret;
466
490
}
467
491
468
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
469
494
static void debuggnutls(__attribute__((unused)) int level,
470
495
const char* string){
471
496
fprintf_plus(stderr, "GnuTLS: %s", string);
472
497
}
473
498
499
__attribute__((nonnull, warn_unused_result))
474
500
static int init_gnutls_global(const char *pubkeyfilename,
475
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
476
503
int ret;
477
504
478
505
if(debug){
481
508
482
509
ret = gnutls_global_init();
483
510
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
485
513
return -1;
486
514
}
487
515
494
522
}
495
523
496
524
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
498
526
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
500
529
gnutls_global_deinit();
501
530
return -1;
502
531
}
503
532
504
533
if(debug){
505
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
508
538
}
509
539
510
540
ret = gnutls_certificate_set_openpgp_key_file
511
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
512
542
GNUTLS_OPENPGP_FMT_BASE64);
513
543
if(ret != GNUTLS_E_SUCCESS){
514
544
fprintf_plus(stderr,
515
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
518
549
goto globalfail;
519
550
}
520
551
521
552
/* GnuTLS server initialization */
522
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
523
554
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
526
558
goto globalfail;
527
559
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
529
561
if(ret != GNUTLS_E_SUCCESS){
530
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
563
safer_gnutls_strerror(ret));
532
564
goto globalfail;
533
565
}
534
566
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
536
568
537
569
return 0;
538
570
539
571
globalfail:
540
572
541
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
542
574
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
544
576
return -1;
545
577
}
546
578
547
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
548
582
int ret;
549
583
/* GnuTLS session creation */
550
584
do {
554
588
}
555
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
590
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
559
594
}
560
595
561
596
{
562
597
const char *err;
563
598
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
565
600
if(quit_now){
566
601
gnutls_deinit(*session);
567
602
return -1;
569
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
605
if(ret != GNUTLS_E_SUCCESS){
571
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
573
609
gnutls_deinit(*session);
574
610
return -1;
575
611
}
577
613
578
614
do {
579
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
616
mc->cred);
581
617
if(quit_now){
582
618
gnutls_deinit(*session);
583
619
return -1;
585
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
622
if(ret != GNUTLS_E_SUCCESS){
587
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
624
safer_gnutls_strerror(ret));
589
625
gnutls_deinit(*session);
590
626
return -1;
591
627
}
593
629
/* ignore client certificate if any. */
594
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
631
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
597
633
598
634
return 0;
599
635
}
603
639
__attribute__((unused)) const char *txt){}
604
640
605
641
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
607
644
AvahiIfIndex if_index,
608
int af){
645
int af, mandos_context *mc){
609
646
int ret, tcp_sd = -1;
610
647
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
648
struct sockaddr_storage to;
615
649
char *buffer = NULL;
616
650
char *decrypted_buffer = NULL;
617
651
size_t buffer_length = 0;
641
675
return -1;
642
676
}
643
677
644
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
645
711
if(ret != 0){
646
712
return -1;
647
713
}
648
714
649
715
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
652
718
}
653
719
654
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
732
667
733
memset(&to, 0, sizeof(to));
668
734
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
671
737
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
674
740
}
675
741
if(ret < 0 ){
676
742
int e = errno;
685
751
goto mandos_end;
686
752
}
687
753
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
757
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
698
760
errno = EINVAL;
699
761
goto mandos_end;
700
762
}
701
763
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
765
}
704
766
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
768
}
709
769
710
770
if(quit_now){
718
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
779
perror_plus("if_indextoname");
720
780
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
723
783
}
724
784
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
726
787
}
727
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
const char *pcret;
730
790
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
733
795
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
736
800
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
739
} else {
740
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
742
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
743
807
}
744
808
}
745
809
749
813
}
750
814
751
815
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
753
818
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
755
821
}
756
822
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
824
int e = errno;
759
825
perror_plus("connect");
760
826
errno = e;
806
872
goto mandos_end;
807
873
}
808
874
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
811
880
812
881
if(quit_now){
813
882
errno = EINTR;
834
903
/* Read OpenPGP packet that contains the wanted password */
835
904
836
905
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
838
908
}
839
909
840
910
while(true){
878
948
}
879
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
950
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
882
953
gnutls_perror(ret);
883
954
errno = EPROTO;
884
955
goto mandos_end;
886
957
break;
887
958
default:
888
959
fprintf_plus(stderr, "Unknown error while reading data from"
889
" encrypted session with Mandos server\n");
960
" encrypted session with Mandos server\n");
890
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
962
errno = EIO;
892
963
goto mandos_end;
916
987
if(buffer_length > 0){
917
988
ssize_t decrypted_buffer_size;
918
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
919
&decrypted_buffer);
990
&decrypted_buffer, mc);
920
991
if(decrypted_buffer_size >= 0){
921
992
922
993
written = 0;
933
1004
int e = errno;
934
1005
if(debug){
935
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
936
strerror(errno));
1007
strerror(errno));
937
1008
}
938
1009
errno = e;
939
1010
goto mandos_end;
970
1041
return retval;
971
1042
}
972
1043
1044
__attribute__((nonnull))
973
1045
static void resolve_callback(AvahiSServiceResolver *r,
974
1046
AvahiIfIndex interface,
975
1047
AvahiProtocol proto,
983
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
984
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
985
1057
flags,
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
988
1062
989
1063
/* Called whenever a service has been resolved successfully or
990
1064
timed out */
996
1070
switch(event){
997
1071
default:
998
1072
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1002
1078
break;
1003
1079
1004
1080
case AVAHI_RESOLVER_FOUND:
1007
1083
avahi_address_snprint(ip, sizeof(ip), address);
1008
1084
if(debug){
1009
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
1012
1088
}
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1015
1093
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1017
1095
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1020
1102
}
1021
1103
}
1022
1104
}
1032
1114
const char *domain,
1033
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
1116
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1037
1121
1038
1122
/* Called whenever a new services becomes available on the LAN or
1039
1123
is removed from the LAN */
1047
1131
case AVAHI_BROWSER_FAILURE:
1048
1132
1049
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1052
1137
return;
1053
1138
1054
1139
case AVAHI_BROWSER_NEW:
1057
1142
the callback function is called the Avahi server will free the
1058
1143
resolver for us. */
1059
1144
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1065
1153
break;
1066
1154
1067
1155
case AVAHI_BROWSER_REMOVE:
1070
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
1160
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1074
1163
}
1075
1164
break;
1076
1165
}
1085
1174
signal_received = sig;
1086
1175
int old_errno = errno;
1087
1176
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1090
1179
}
1091
1180
errno = old_errno;
1092
1181
}
1093
1182
1183
__attribute__((nonnull, warn_unused_result))
1094
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
1185
int ret;
1186
error_t ret_errno;
1096
1187
1097
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
1189
if(s < 0){
1190
ret_errno = errno;
1099
1191
perror_plus("socket");
1192
errno = ret_errno;
1100
1193
return false;
1101
1194
}
1102
1195
strcpy(ifr->ifr_name, ifname);
1103
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
1197
if(ret == -1){
1105
1198
if(debug){
1199
ret_errno = errno;
1106
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1107
1202
}
1108
1203
return false;
1109
1204
}
1110
1205
return true;
1111
1206
}
1112
1207
1208
__attribute__((nonnull, warn_unused_result))
1113
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1210
1115
1211
/* Reject the loopback device */
1116
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
1213
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1119
1216
}
1120
1217
return false;
1121
1218
}
1122
1219
/* Accept point-to-point devices only if connect_to is specified */
1123
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
1221
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1126
1224
}
1127
1225
return true;
1128
1226
}
1129
1227
/* Otherwise, reject non-broadcast-capable devices */
1130
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
1229
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1133
1232
}
1134
1233
return false;
1135
1234
}
1136
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
1236
if(ifr->ifr_flags & IFF_NOARP){
1138
1237
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1140
1240
}
1141
1241
return false;
1142
1242
}
1153
1253
* corresponds to an acceptable network device.
1154
1254
* (This function is passed to scandir(3) as a filter function.)
1155
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1156
1257
int good_interface(const struct dirent *if_entry){
1157
1258
if(if_entry->d_name[0] == '.'){
1158
1259
return 0;
1161
1262
struct ifreq ifr;
1162
1263
if(not get_flags(if_entry->d_name, &ifr)){
1163
1264
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(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_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1219
1312
int notdotentries(const struct dirent *direntry){
1220
1313
/* Skip "." and ".." */
1221
1314
if(direntry->d_name[0] == '.'
1228
1321
}
1229
1322
1230
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1231
1325
int runnable_hook(const struct dirent *direntry){
1232
1326
int ret;
1233
1327
size_t sret;
1246
1340
/* Contains non-allowed characters */
1247
1341
if(debug){
1248
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1343
direntry->d_name);
1250
1344
}
1251
1345
return 0;
1252
1346
}
1269
1363
/* Not a regular file */
1270
1364
if(debug){
1271
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1366
direntry->d_name);
1273
1367
}
1274
1368
return 0;
1275
1369
}
1277
1371
/* Not executable */
1278
1372
if(debug){
1279
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1374
direntry->d_name);
1281
1375
}
1282
1376
return 0;
1283
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1284
1382
return 1;
1285
1383
}
1286
1384
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1288
1388
int ret;
1289
1389
struct timespec now;
1290
1390
struct timespec waited_time;
1291
1391
intmax_t block_time;
1292
1392
1293
1393
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1297
1398
}
1298
1399
ret = avahi_simple_poll_iterate(s, -1);
1299
1400
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1303
1404
}
1304
1405
/* the current time */
1305
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1310
1411
/* Calculating in ms how long time between now and server
1311
1412
who we visted longest time ago. Now - last seen. */
1312
1413
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1414
- mc->current_server->last_seen.tv_sec);
1314
1415
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1416
- mc->current_server->last_seen.tv_nsec);
1316
1417
/* total time is 10s/10,000ms.
1317
1418
Converting to s from ms by dividing by 1,000,
1318
1419
and ns to ms by dividing by 1,000,000. */
1320
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1321
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1423
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1325
1427
}
1326
1428
1327
1429
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1332
1434
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1334
1436
return 0;
1335
1437
}
1336
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1338
1440
if(ret == -1){
1339
1441
perror_plus("clock_gettime");
1340
1442
return -1;
1341
1443
}
1342
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1343
1445
block_time = 0; /* Call avahi to find new Mandos
1344
1446
servers, but don't block */
1345
1447
}
1347
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
1450
}
1349
1451
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1351
1453
return (ret != 1) ? ret : 0;
1352
1454
}
1353
1455
}
1354
1456
}
1355
1457
}
1356
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
1861
}
1862
1357
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1358
1868
AvahiSServiceBrowser *sb = NULL;
1359
int error;
1869
error_t ret_errno;
1360
1870
int ret;
1361
1871
intmax_t tmpmax;
1362
1872
char *tmp;
1363
1873
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1372
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
1880
const char *seckey = PATHDIR "/" SECKEY;
1374
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1375
1883
1376
1884
bool gnutls_initialized = false;
1377
1885
bool gpgme_initialized = false;
1439
1947
.group = 2 },
1440
1948
{ .name = "retry", .key = 132,
1441
1949
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
1950
.doc = "Retry interval used when denied by the Mandos server",
1443
1951
.group = 2 },
1444
1952
{ .name = "network-hook-dir", .key = 133,
1445
1953
.arg = "DIR",
1468
1976
connect_to = arg;
1469
1977
break;
1470
1978
case 'i': /* --interface */
1471
interface = arg;
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1472
1984
break;
1473
1985
case 's': /* --seckey */
1474
1986
seckey = arg;
1517
2029
argp_state_help(state, state->out_stream,
1518
2030
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
2031
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
2032
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
2033
exit(argp_err_exit_status);
1523
2034
break;
1551
2062
{
1552
2063
/* Work around Debian bug #633582:
1553
2064
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
1619
2071
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
2139
}
2140
}
2141
2142
/* Run network hooks */
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1705
2155
}
1706
2156
1707
2157
if(not debug){
1708
2158
avahi_set_log_function(empty_log);
1709
2159
}
1710
2160
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1743
2161
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
2162
from the signal handler */
1745
2163
/* Initialize the pseudo-RNG for Avahi */
1746
2164
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
2167
fprintf_plus(stderr,
2168
"Avahi: Failed to create simple poll object.\n");
1750
2169
exitcode = EX_UNAVAILABLE;
1751
2170
goto end;
1752
2171
}
1814
2233
}
1815
2234
}
1816
2235
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1902
2283
}
1903
2284
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
2285
break;
1922
2286
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1960
2314
}
1961
2315
1962
2316
if(quit_now){
1963
2317
goto end;
1964
2318
}
1965
2319
1966
ret = init_gnutls_global(pubkey, seckey);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
1967
2321
if(ret == -1){
1968
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
2323
exitcode = EX_UNAVAILABLE;
1976
2330
goto end;
1977
2331
}
1978
2332
1979
if(mkdtemp(tempdir) == NULL){
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
1980
2343
perror_plus("mkdtemp");
1981
2344
goto end;
1982
2345
}
1983
tempdir_created = true;
1984
2346
1985
2347
if(quit_now){
1986
2348
goto end;
1987
2349
}
1988
2350
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1990
2352
fprintf_plus(stderr, "init_gpgme failed\n");
1991
2353
exitcode = EX_UNAVAILABLE;
1992
2354
goto end;
2002
2364
/* Connect directly, do not use Zeroconf */
2003
2365
/* (Mainly meant for debugging) */
2004
2366
char *address = strrchr(connect_to, ':');
2367
2005
2368
if(address == NULL){
2006
2369
fprintf_plus(stderr, "No colon in address\n");
2007
2370
exitcode = EX_USAGE;
2012
2375
goto end;
2013
2376
}
2014
2377
2015
uint16_t port;
2378
in_port_t port;
2016
2379
errno = 0;
2017
2380
tmpmax = strtoimax(address+1, &tmp, 10);
2018
2381
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
2382
or tmpmax != (in_port_t)tmpmax){
2020
2383
fprintf_plus(stderr, "Bad port number\n");
2021
2384
exitcode = EX_USAGE;
2022
2385
goto end;
2023
2386
}
2024
2387
2025
2388
if(quit_now){
2026
2389
goto end;
2027
2390
}
2028
2391
2029
port = (uint16_t)tmpmax;
2392
port = (in_port_t)tmpmax;
2030
2393
*address = '\0';
2031
2394
/* Colon in address indicates IPv6 */
2032
2395
int af;
2048
2411
}
2049
2412
2050
2413
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2052
2416
if(quit_now or ret == 0){
2053
2417
break;
2054
2418
}
2055
2419
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
(int)retry_interval);
2057
2422
}
2058
sleep((int)retry_interval);
2423
sleep((unsigned int)retry_interval);
2059
2424
}
2060
2425
2061
if (not quit_now){
2426
if(not quit_now){
2062
2427
exitcode = EXIT_SUCCESS;
2063
2428
}
2064
2429
2079
2444
config.publish_domain = 0;
2080
2445
2081
2446
/* Allocate a new server */
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
2085
2449
2086
2450
/* Free the Avahi configuration data */
2087
2451
avahi_server_config_free(&config);
2090
2454
/* Check if creating the Avahi server object succeeded */
2091
2455
if(mc.server == NULL){
2092
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2093
avahi_strerror(error));
2457
avahi_strerror(ret_errno));
2094
2458
exitcode = EX_UNAVAILABLE;
2095
2459
goto end;
2096
2460
}
2102
2466
/* Create the Avahi service browser */
2103
2467
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
2468
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
2106
2471
if(sb == NULL){
2107
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2108
avahi_strerror(avahi_server_errno(mc.server)));
2473
avahi_strerror(avahi_server_errno(mc.server)));
2109
2474
exitcode = EX_UNAVAILABLE;
2110
2475
goto end;
2111
2476
}
2120
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
2486
}
2122
2487
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2125
2490
if(debug){
2126
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2492
(ret == 0) ? "successfully" : "with error");
2128
2493
}
2129
2494
2130
2495
end:
2134
2499
}
2135
2500
2136
2501
/* Cleanup things */
2502
free(mc.interfaces);
2503
2137
2504
if(sb != NULL)
2138
2505
avahi_s_service_browser_free(sb);
2139
2506
2140
2507
if(mc.server != NULL)
2141
2508
avahi_server_free(mc.server);
2142
2509
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
2145
2512
2146
2513
if(gnutls_initialized){
2147
2514
gnutls_certificate_free_credentials(mc.cred);
2152
2519
if(gpgme_initialized){
2153
2520
gpgme_release(mc.ctx);
2154
2521
}
2155
2522
2156
2523
/* Cleans up the circular linked list of Mandos servers the client
2157
2524
has seen */
2158
2525
if(mc.current_server != NULL){
2164
2531
}
2165
2532
}
2166
2533
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2534
/* Re-raise privileges */
2535
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2176
2562
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2198
2566
}
2199
2567
}
2200
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2571
2201
2572
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
2573
if(tempdir != NULL){
2203
2574
struct dirent **direntries = NULL;
2204
2575
struct dirent *direntry = NULL;
2205
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
2577
alphasort);
2207
if (numentries > 0){
2578
if(numentries > 0){
2208
2579
for(int i = 0; i < numentries; i++){
2209
2580
direntry = direntries[i];
2210
2581
char *fullname = NULL;
2216
2587
}
2217
2588
ret = remove(fullname);
2218
2589
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
2220
2592
}
2221
2593
free(fullname);
2222
2594
}
2224
2596
2225
2597
/* need to clean even if 0 because man page doesn't specify */
2226
2598
free(direntries);
2227
if (numentries == -1){
2599
if(numentries == -1){
2228
2600
perror_plus("scandir");
2229
2601
}
2230
2602
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0