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- Committer: Teddy Hogeborn
- Date: 2011-11-24 21:12:35 UTC
- mto: (505.2.9 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124211235-drbwkp12g6fdn59c
* Makefile (run-client): Add "--network-hook-dir" option.
* plugin-runner.c (main): Only try to work around Debian bug #633582
if started as root.
* plugins.d/mandos-client.c (run_network_hooks): Bug fix: Run all
network hooks, not
just the first one.
Also add debug output.
(main): Only try to work around Debian bug #633582 or run network
hooks as root if started as root.
* plugin-runner.c (main): Only try to work around Debian bug #633582
if started as root.
* plugins.d/mandos-client.c (run_network_hooks): Bug fix: Run all
network hooks, not
just the first one.
Also add debug output.
(main): Only try to work around Debian bug #633582 or run network
hooks as root if started as root.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
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(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
90
99
91
#ifdef __linux__
100
92
#include <sys/klog.h> /* klogctl() */
142
134
static const char sys_class_net[] = "/sys/class/net";
143
135
char *connect_to = NULL;
144
136
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
137
149
138
/* Doubly linked list that need to be circularly linked when used */
150
139
typedef struct server{
151
140
const char *ip;
152
in_port_t port;
141
uint16_t port;
153
142
AvahiIfIndex if_index;
154
143
int af;
155
144
struct timespec last_seen;
159
148
160
149
/* Used for passing in values through the Avahi callback functions */
161
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
162
152
AvahiServer *server;
163
153
gnutls_certificate_credentials_t cred;
164
154
unsigned int dh_bits;
166
156
const char *priority;
167
157
gpgme_ctx_t ctx;
168
158
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
159
} mandos_context;
172
160
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
166
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
178
169
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
181
int e = errno;
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
184
errno = e;
185
174
perror(print_text);
186
175
}
187
176
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
177
int fprintf_plus(FILE *stream, const char *format, ...){
190
178
va_list ap;
191
179
va_start (ap, format);
192
180
193
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
182
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
184
}
197
185
198
186
/*
200
188
* bytes. "buffer_capacity" is how much is currently allocated,
201
189
* "buffer_length" is how much is already used.
202
190
*/
203
__attribute__((nonnull, warn_unused_result))
204
191
size_t incbuffer(char **buffer, size_t buffer_length,
205
192
size_t buffer_capacity){
206
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
213
196
return 0;
214
197
}
215
*buffer = new_buf;
216
198
buffer_capacity += BUFFER_SIZE;
217
199
}
218
200
return buffer_capacity;
219
201
}
220
202
221
203
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
225
206
int ret;
226
207
server *new_server = malloc(sizeof(server));
227
208
if(new_server == NULL){
228
209
perror_plus("malloc");
229
return false;
210
return -1;
230
211
}
231
212
*new_server = (server){ .ip = strdup(ip),
232
213
.port = port,
234
215
.af = af };
235
216
if(new_server->ip == NULL){
236
217
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
218
return -1;
253
219
}
254
220
/* Special case of first server */
255
if(*current_server == NULL){
221
if (mc.current_server == NULL){
256
222
new_server->next = new_server;
257
223
new_server->prev = new_server;
258
*current_server = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
259
226
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
263
229
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
267
238
}
268
239
269
240
/*
270
241
* Initialize GPGME.
271
242
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
277
245
gpgme_error_t rc;
278
246
gpgme_engine_info_t engine_info;
279
247
248
280
249
/*
281
250
* Helper function to insert pub and seckey to the engine keyring.
282
251
*/
283
bool import_key(const char * const filename){
252
bool import_key(const char *filename){
284
253
int ret;
285
254
int fd;
286
255
gpgme_data_t pgp_data;
298
267
return false;
299
268
}
300
269
301
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
302
271
if(rc != GPG_ERR_NO_ERROR){
303
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
273
gpgme_strsource(rc), gpgme_strerror(rc));
348
317
}
349
318
350
319
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
352
321
if(rc != GPG_ERR_NO_ERROR){
353
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
336
* Decrypt OpenPGP data.
368
337
* Returns -1 on error
369
338
*/
370
__attribute__((nonnull, warn_unused_result))
371
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
340
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
341
char **plaintext){
375
342
gpgme_data_t dh_crypto, dh_plain;
376
343
gpgme_error_t rc;
377
344
ssize_t ret;
403
370
404
371
/* Decrypt data from the cryptotext data buffer to the plaintext
405
372
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
374
if(rc != GPG_ERR_NO_ERROR){
408
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
376
gpgme_strsource(rc), gpgme_strerror(rc));
410
377
plaintext_length = -1;
411
378
if(debug){
412
379
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
414
381
if(result == NULL){
415
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
383
} else {
493
460
return plaintext_length;
494
461
}
495
462
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
507
469
}
508
470
509
471
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
472
static void debuggnutls(__attribute__((unused)) int level,
512
473
const char* string){
513
474
fprintf_plus(stderr, "GnuTLS: %s", string);
514
475
}
515
476
516
__attribute__((nonnull, warn_unused_result))
517
477
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
478
const char *seckeyfilename){
520
479
int ret;
521
unsigned int uret;
522
480
523
481
if(debug){
524
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
540
498
}
541
499
542
500
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
502
if(ret != GNUTLS_E_SUCCESS){
545
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
504
safer_gnutls_strerror(ret));
556
514
}
557
515
558
516
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
560
518
GNUTLS_OPENPGP_FMT_BASE64);
561
519
if(ret != GNUTLS_E_SUCCESS){
562
520
fprintf_plus(stderr,
568
526
}
569
527
570
528
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
572
530
if(ret != GNUTLS_E_SUCCESS){
573
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
532
" initialization: %s\n",
575
533
safer_gnutls_strerror(ret));
576
534
goto globalfail;
577
535
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
537
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
683
540
goto globalfail;
684
541
}
685
542
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
544
688
545
return 0;
689
546
690
547
globalfail:
691
548
692
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
693
550
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
695
552
return -1;
696
553
}
697
554
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
701
556
int ret;
702
557
/* GnuTLS session creation */
703
558
do {
715
570
{
716
571
const char *err;
717
572
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
719
574
if(quit_now){
720
575
gnutls_deinit(*session);
721
576
return -1;
732
587
733
588
do {
734
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
590
mc.cred);
736
591
if(quit_now){
737
592
gnutls_deinit(*session);
738
593
return -1;
748
603
/* ignore client certificate if any. */
749
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
605
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
607
753
608
return 0;
754
609
}
758
613
__attribute__((unused)) const char *txt){}
759
614
760
615
/* Called when a Mandos server is found */
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
763
617
AvahiIfIndex if_index,
764
int af, mandos_context *mc){
618
int af){
765
619
int ret, tcp_sd = -1;
766
620
ssize_t sret;
767
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
768
625
char *buffer = NULL;
769
626
char *decrypted_buffer = NULL;
770
627
size_t buffer_length = 0;
794
651
return -1;
795
652
}
796
653
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
825
return -1;
826
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
830
655
if(ret != 0){
831
656
return -1;
832
657
}
833
658
834
659
if(debug){
835
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
837
662
}
838
663
839
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
851
676
852
677
memset(&to, 0, sizeof(to));
853
678
if(af == AF_INET6){
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
856
681
} else { /* IPv4 */
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
859
684
}
860
685
if(ret < 0 ){
861
686
int e = errno;
870
695
goto mandos_end;
871
696
}
872
697
if(af == AF_INET6){
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
876
705
if(if_index == AVAHI_IF_UNSPEC){
877
706
fprintf_plus(stderr, "An IPv6 link-local address is"
878
707
" incomplete without a network interface\n");
880
709
goto mandos_end;
881
710
}
882
711
/* Set the network interface number as scope */
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
884
713
}
885
714
} else {
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
887
718
}
888
719
889
720
if(quit_now){
897
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
729
perror_plus("if_indextoname");
899
730
} else {
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
902
733
}
903
734
} else {
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
906
737
}
907
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
908
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
909
741
if(af == AF_INET6){
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
914
744
} else {
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
919
747
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
926
754
}
927
755
}
928
756
932
760
}
933
761
934
762
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
937
764
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
940
766
}
941
767
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
769
int e = errno;
944
770
perror_plus("connect");
945
771
errno = e;
991
817
goto mandos_end;
992
818
}
993
819
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
999
822
1000
823
if(quit_now){
1001
824
errno = EINTR;
1106
929
if(buffer_length > 0){
1107
930
ssize_t decrypted_buffer_size;
1108
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
932
&decrypted_buffer);
1110
933
if(decrypted_buffer_size >= 0){
1111
934
1112
935
written = 0;
1160
983
return retval;
1161
984
}
1162
985
1163
__attribute__((nonnull))
1164
986
static void resolve_callback(AvahiSServiceResolver *r,
1165
987
AvahiIfIndex interface,
1166
988
AvahiProtocol proto,
1174
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1175
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1176
998
flags,
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1181
1001
1182
1002
/* Called whenever a service has been resolved successfully or
1183
1003
timed out */
1184
1004
1185
1005
if(quit_now){
1186
avahi_s_service_resolver_free(r);
1187
1006
return;
1188
1007
}
1189
1008
1193
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
1014
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1198
1016
break;
1199
1017
1200
1018
case AVAHI_RESOLVER_FOUND:
1206
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
1025
host_name, ip, (intmax_t)interface, port);
1208
1026
}
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1213
1029
if(ret == 0){
1214
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1215
1031
} else {
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1222
1034
}
1223
1035
}
1224
1036
}
1234
1046
const char *domain,
1235
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1236
1048
flags,
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1241
1051
1242
1052
/* Called whenever a new services becomes available on the LAN or
1243
1053
is removed from the LAN */
1251
1061
case AVAHI_BROWSER_FAILURE:
1252
1062
1253
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1257
1066
return;
1258
1067
1259
1068
case AVAHI_BROWSER_NEW:
1262
1071
the callback function is called the Avahi server will free the
1263
1072
resolver for us. */
1264
1073
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1269
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
1078
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1273
1080
break;
1274
1081
1275
1082
case AVAHI_BROWSER_REMOVE:
1294
1101
signal_received = sig;
1295
1102
int old_errno = errno;
1296
1103
/* set main loop to exit */
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1299
1106
}
1300
1107
errno = old_errno;
1301
1108
}
1302
1109
1303
__attribute__((nonnull, warn_unused_result))
1304
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
1111
int ret;
1306
error_t ret_errno;
1307
1112
1308
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
1114
if(s < 0){
1310
ret_errno = errno;
1311
1115
perror_plus("socket");
1312
errno = ret_errno;
1313
1116
return false;
1314
1117
}
1315
1118
strcpy(ifr->ifr_name, ifname);
1316
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
1120
if(ret == -1){
1318
1121
if(debug){
1319
ret_errno = errno;
1320
1122
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1322
1123
}
1323
1124
return false;
1324
1125
}
1325
1126
return true;
1326
1127
}
1327
1128
1328
__attribute__((nonnull, warn_unused_result))
1329
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1330
1130
1331
1131
/* Reject the loopback device */
1373
1173
* corresponds to an acceptable network device.
1374
1174
* (This function is passed to scandir(3) as a filter function.)
1375
1175
*/
1376
__attribute__((nonnull, warn_unused_result))
1377
1176
int good_interface(const struct dirent *if_entry){
1378
1177
if(if_entry->d_name[0] == '.'){
1379
1178
return 0;
1395
1194
}
1396
1195
1397
1196
/*
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1432
1239
int notdotentries(const struct dirent *direntry){
1433
1240
/* Skip "." and ".." */
1434
1241
if(direntry->d_name[0] == '.'
1441
1248
}
1442
1249
1443
1250
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1445
1251
int runnable_hook(const struct dirent *direntry){
1446
1252
int ret;
1447
1253
size_t sret;
1455
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
1262
"abcdefghijklmnopqrstuvwxyz"
1457
1263
"0123456789"
1458
"_.-");
1264
"_-");
1459
1265
if((direntry->d_name)[sret] != '\0'){
1460
1266
/* Contains non-allowed characters */
1461
1267
if(debug){
1465
1271
return 0;
1466
1272
}
1467
1273
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1469
1282
if(ret == -1){
1470
1283
if(debug){
1471
1284
perror_plus("Could not stat hook");
1488
1301
}
1489
1302
return 0;
1490
1303
}
1491
if(debug){
1492
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1493
direntry->d_name);
1494
}
1495
1304
return 1;
1496
1305
}
1497
1306
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1501
1308
int ret;
1502
1309
struct timespec now;
1503
1310
struct timespec waited_time;
1504
1311
intmax_t block_time;
1505
1312
1506
1313
while(true){
1507
if(mc->current_server == NULL){
1508
if(debug){
1314
if(mc.current_server == NULL){
1315
if (debug){
1509
1316
fprintf_plus(stderr, "Wait until first server is found."
1510
1317
" No timeout!\n");
1511
1318
}
1512
1319
ret = avahi_simple_poll_iterate(s, -1);
1513
1320
} else {
1514
if(debug){
1321
if (debug){
1515
1322
fprintf_plus(stderr, "Check current_server if we should run"
1516
1323
" it, or wait\n");
1517
1324
}
1524
1331
/* Calculating in ms how long time between now and server
1525
1332
who we visted longest time ago. Now - last seen. */
1526
1333
waited_time.tv_sec = (now.tv_sec
1527
- mc->current_server->last_seen.tv_sec);
1334
- mc.current_server->last_seen.tv_sec);
1528
1335
waited_time.tv_nsec = (now.tv_nsec
1529
- mc->current_server->last_seen.tv_nsec);
1336
- mc.current_server->last_seen.tv_nsec);
1530
1337
/* total time is 10s/10,000ms.
1531
1338
Converting to s from ms by dividing by 1,000,
1532
1339
and ns to ms by dividing by 1,000,000. */
1534
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1535
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1536
1343
1537
if(debug){
1344
if (debug){
1538
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
1346
block_time);
1540
1347
}
1541
1348
1542
1349
if(block_time <= 0){
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1547
1354
if(ret == 0){
1548
avahi_simple_poll_quit(s);
1355
avahi_simple_poll_quit(mc.simple_poll);
1549
1356
return 0;
1550
1357
}
1551
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1552
&mc->current_server->last_seen);
1359
&mc.current_server->last_seen);
1553
1360
if(ret == -1){
1554
1361
perror_plus("clock_gettime");
1555
1362
return -1;
1556
1363
}
1557
mc->current_server = mc->current_server->next;
1364
mc.current_server = mc.current_server->next;
1558
1365
block_time = 0; /* Call avahi to find new Mandos
1559
1366
servers, but don't block */
1560
1367
}
1562
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1563
1370
}
1564
1371
if(ret != 0){
1565
if(ret > 0 or errno != EINTR){
1372
if (ret > 0 or errno != EINTR){
1566
1373
return (ret != 1) ? ret : 0;
1567
1374
}
1568
1375
}
1569
1376
}
1570
1377
}
1571
1378
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1379
bool run_network_hooks(const char *mode, const char *interface,
1626
1380
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1654
1386
if(numhooks == -1){
1655
1387
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[i];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1728
1395
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1396
continue;
1397
}
1398
if(debug){
1399
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1400
direntry->d_name);
1401
}
1402
pid_t hook_pid = fork();
1403
if(hook_pid == 0){
1404
/* Child */
1405
dup2(devnull, STDIN_FILENO);
1406
close(devnull);
1407
dup2(STDERR_FILENO, STDOUT_FILENO);
1408
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1409
if(ret == -1){
1410
perror_plus("setenv");
1411
return false;
1412
}
1413
ret = setenv("DEVICE", interface, 1);
1414
if(ret == -1){
1415
perror_plus("setenv");
1416
return false;
1417
}
1418
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1419
if(ret == -1){
1420
perror_plus("setenv");
1421
return false;
1422
}
1423
ret = setenv("MODE", mode, 1);
1424
if(ret == -1){
1425
perror_plus("setenv");
1426
return false;
1427
}
1428
char *delaystring;
1429
ret = asprintf(&delaystring, "%f", delay);
1430
if(ret == -1){
1431
perror_plus("asprintf");
1432
return false;
1433
}
1434
ret = setenv("DELAY", delaystring, 1);
1435
if(ret == -1){
1436
free(delaystring);
1437
perror_plus("setenv");
1438
return false;
1439
}
1733
1440
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1785
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
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
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1943
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
1441
ret = execl(fullname, direntry->d_name, mode, NULL);
1442
perror_plus("execl");
1443
} else {
1444
int status;
1445
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1446
perror_plus("waitpid");
1447
free(fullname);
1448
continue;
1449
}
1450
if(WIFEXITED(status)){
1451
if(WEXITSTATUS(status) != 0){
1452
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1453
" with status %d\n", direntry->d_name,
1454
WEXITSTATUS(status));
1455
free(fullname);
1456
continue;
1457
}
1458
} else if(WIFSIGNALED(status)){
1459
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1460
" signal %d\n", direntry->d_name,
1461
WTERMSIG(status));
1462
free(fullname);
1463
continue;
1464
} else {
1465
fprintf_plus(stderr, "Warning: network hook \"%s\""
1466
" crashed\n", direntry->d_name);
1467
free(fullname);
1468
continue;
1469
}
1470
}
1471
free(fullname);
1472
if(quit_now){
1473
break;
1474
}
1475
}
1476
close(devnull);
1477
}
1478
return true;
2007
1479
}
2008
1480
2009
1481
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2014
1482
AvahiSServiceBrowser *sb = NULL;
2015
error_t ret_errno;
1483
int error;
2016
1484
int ret;
2017
1485
intmax_t tmpmax;
2018
1486
char *tmp;
2019
1487
int exitcode = EXIT_SUCCESS;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1488
const char *interface = "";
1489
struct ifreq network;
1490
int sd = -1;
1491
bool take_down_interface = false;
1492
uid_t uid;
1493
gid_t gid;
1494
char tempdir[] = "/tmp/mandosXXXXXX";
1495
bool tempdir_created = false;
2025
1496
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2026
1497
const char *seckey = PATHDIR "/" SECKEY;
2027
1498
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
2029
1499
2030
1500
bool gnutls_initialized = false;
2031
1501
bool gpgme_initialized = false;
2093
1563
.group = 2 },
2094
1564
{ .name = "retry", .key = 132,
2095
1565
.arg = "SECONDS",
2096
.doc = "Retry interval used when denied by the Mandos server",
1566
.doc = "Retry interval used when denied by the mandos server",
2097
1567
.group = 2 },
2098
1568
{ .name = "network-hook-dir", .key = 133,
2099
1569
.arg = "DIR",
2122
1592
connect_to = arg;
2123
1593
break;
2124
1594
case 'i': /* --interface */
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
1595
interface = arg;
2130
1596
break;
2131
1597
case 's': /* --seckey */
2132
1598
seckey = arg;
2175
1641
argp_state_help(state, state->out_stream,
2176
1642
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2177
1643
case 'V': /* --version */
1644
fprintf_plus(state->out_stream,
1645
"Mandos plugin mandos-client: ");
2178
1646
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2179
1647
exit(argp_err_exit_status);
2180
1648
break;
2205
1673
}
2206
1674
}
2207
1675
2208
{
1676
if(getuid() == 0){
2209
1677
/* Work around Debian bug #633582:
2210
1678
<http://bugs.debian.org/633582> */
2211
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
2218
struct stat st;
2219
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2221
int seckey_fd = open(seckey, O_RDONLY);
2222
if(seckey_fd == -1){
2223
perror_plus("open");
2224
} else {
2225
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2226
if(ret == -1){
2227
perror_plus("fstat");
2228
} else {
2229
if(S_ISREG(st.st_mode)
2230
and st.st_uid == 0 and st.st_gid == 0){
2231
ret = fchown(seckey_fd, uid, gid);
2232
if(ret == -1){
2233
perror_plus("fchown");
2234
}
2235
}
2236
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2238
}
2239
}
2240
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2243
if(pubkey_fd == -1){
2244
perror_plus("open");
2245
} else {
2246
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2247
if(ret == -1){
2248
perror_plus("fstat");
2249
} else {
2250
if(S_ISREG(st.st_mode)
2251
and st.st_uid == 0 and st.st_gid == 0){
2252
ret = fchown(pubkey_fd, uid, gid);
2253
if(ret == -1){
2254
perror_plus("fchown");
2255
}
2256
}
2257
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
2284
}
1679
struct stat st;
1680
1681
/* Re-raise priviliges */
1682
errno = 0;
1683
ret = seteuid(0);
1684
if(ret == -1){
1685
perror_plus("seteuid");
1686
}
1687
1688
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1689
int seckey_fd = open(seckey, O_RDONLY);
1690
if(seckey_fd == -1){
1691
perror_plus("open");
1692
} else {
1693
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1694
if(ret == -1){
1695
perror_plus("fstat");
1696
} else {
1697
if(S_ISREG(st.st_mode)
1698
and st.st_uid == 0 and st.st_gid == 0){
1699
ret = fchown(seckey_fd, uid, gid);
1700
if(ret == -1){
1701
perror_plus("fchown");
1702
}
1703
}
1704
}
1705
TEMP_FAILURE_RETRY(close(seckey_fd));
1706
}
1707
}
1708
1709
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1710
int pubkey_fd = open(pubkey, O_RDONLY);
1711
if(pubkey_fd == -1){
1712
perror_plus("open");
1713
} else {
1714
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1715
if(ret == -1){
1716
perror_plus("fstat");
1717
} else {
1718
if(S_ISREG(st.st_mode)
1719
and st.st_uid == 0 and st.st_gid == 0){
1720
ret = fchown(pubkey_fd, uid, gid);
1721
if(ret == -1){
1722
perror_plus("fchown");
1723
}
1724
}
1725
}
1726
TEMP_FAILURE_RETRY(close(pubkey_fd));
1727
}
1728
}
1729
1730
/* Lower privileges */
1731
errno = 0;
1732
ret = seteuid(uid);
1733
if(ret == -1){
1734
perror_plus("seteuid");
2285
1735
}
2286
1736
}
2287
1737
2288
1738
/* Run network hooks */
2289
1739
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
2294
goto end;
2295
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
1740
if(getuid() == 0){
1741
/* Re-raise priviliges */
1742
errno = 0;
1743
ret = seteuid(0);
1744
if(ret == -1){
1745
perror_plus("seteuid");
1746
}
1747
}
1748
if(not run_network_hooks("start", interface, delay)){
1749
goto end;
1750
}
1751
if(getuid() == 0){
1752
/* Lower privileges */
1753
errno = 0;
1754
ret = seteuid(uid);
1755
if(ret == -1){
1756
perror_plus("seteuid");
1757
}
1758
}
2301
1759
}
2302
1760
2303
1761
if(not debug){
2304
1762
avahi_set_log_function(empty_log);
2305
1763
}
2306
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1781
}
1782
if(interface == NULL){
1783
perror_plus("malloc");
1784
free(direntries);
1785
exitcode = EXIT_FAILURE;
1786
goto end;
1787
}
1788
free(direntries);
1789
} else {
1790
free(direntries);
1791
fprintf_plus(stderr, "Could not find a network interface\n");
1792
exitcode = EXIT_FAILURE;
1793
goto end;
1794
}
1795
}
1796
2307
1797
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2308
1798
from the signal handler */
2309
1799
/* Initialize the pseudo-RNG for Avahi */
2310
1800
srand((unsigned int) time(NULL));
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
1801
mc.simple_poll = avahi_simple_poll_new();
1802
if(mc.simple_poll == NULL){
2313
1803
fprintf_plus(stderr,
2314
1804
"Avahi: Failed to create simple poll object.\n");
2315
1805
exitcode = EX_UNAVAILABLE;
2379
1869
}
2380
1870
}
2381
1871
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
1872
/* If the interface is down, bring it up */
1873
if(strcmp(interface, "none") != 0){
1874
if_index = (AvahiIfIndex) if_nametoindex(interface);
1875
if(if_index == 0){
1876
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1877
exitcode = EX_UNAVAILABLE;
1878
goto end;
1879
}
1880
1881
if(quit_now){
1882
goto end;
1883
}
1884
1885
/* Re-raise priviliges */
1886
errno = 0;
1887
ret = seteuid(0);
1888
if(ret == -1){
1889
perror_plus("seteuid");
1890
}
1891
1892
#ifdef __linux__
1893
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1894
messages about the network interface to mess up the prompt */
1895
ret = klogctl(8, NULL, 5);
1896
bool restore_loglevel = true;
1897
if(ret == -1){
1898
restore_loglevel = false;
1899
perror_plus("klogctl");
1900
}
1901
#endif /* __linux__ */
1902
1903
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1904
if(sd < 0){
1905
perror_plus("socket");
1906
exitcode = EX_OSERR;
1907
#ifdef __linux__
1908
if(restore_loglevel){
1909
ret = klogctl(7, NULL, 0);
1910
if(ret == -1){
1911
perror_plus("klogctl");
1912
}
1913
}
1914
#endif /* __linux__ */
1915
/* Lower privileges */
1916
errno = 0;
1917
ret = seteuid(uid);
1918
if(ret == -1){
1919
perror_plus("seteuid");
1920
}
1921
goto end;
1922
}
1923
strcpy(network.ifr_name, interface);
1924
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1925
if(ret == -1){
1926
perror_plus("ioctl SIOCGIFFLAGS");
1927
#ifdef __linux__
1928
if(restore_loglevel){
1929
ret = klogctl(7, NULL, 0);
1930
if(ret == -1){
1931
perror_plus("klogctl");
1932
}
1933
}
1934
#endif /* __linux__ */
1935
exitcode = EX_OSERR;
1936
/* Lower privileges */
1937
errno = 0;
1938
ret = seteuid(uid);
1939
if(ret == -1){
1940
perror_plus("seteuid");
1941
}
1942
goto end;
1943
}
1944
if((network.ifr_flags & IFF_UP) == 0){
1945
network.ifr_flags |= IFF_UP;
1946
take_down_interface = true;
1947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1948
if(ret == -1){
1949
take_down_interface = false;
1950
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1951
exitcode = EX_OSERR;
1952
#ifdef __linux__
1953
if(restore_loglevel){
1954
ret = klogctl(7, NULL, 0);
1955
if(ret == -1){
1956
perror_plus("klogctl");
2433
1957
}
2434
1958
}
1959
#endif /* __linux__ */
1960
/* Lower privileges */
1961
errno = 0;
1962
ret = seteuid(uid);
1963
if(ret == -1){
1964
perror_plus("seteuid");
1965
}
1966
goto end;
1967
}
1968
}
1969
/* Sleep checking until interface is running.
1970
Check every 0.25s, up to total time of delay */
1971
for(int i=0; i < delay * 4; i++){
1972
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1973
if(ret == -1){
1974
perror_plus("ioctl SIOCGIFFLAGS");
1975
} else if(network.ifr_flags & IFF_RUNNING){
2435
1976
break;
2436
1977
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1978
struct timespec sleeptime = { .tv_nsec = 250000000 };
1979
ret = nanosleep(&sleeptime, NULL);
1980
if(ret == -1 and errno != EINTR){
1981
perror_plus("nanosleep");
1982
}
1983
}
1984
if(not take_down_interface){
1985
/* We won't need the socket anymore */
1986
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1987
if(ret == -1){
1988
perror_plus("close");
1989
}
1990
}
1991
#ifdef __linux__
1992
if(restore_loglevel){
1993
/* Restores kernel loglevel to default */
1994
ret = klogctl(7, NULL, 0);
1995
if(ret == -1){
1996
perror_plus("klogctl");
1997
}
1998
}
1999
#endif /* __linux__ */
2000
/* Lower privileges */
2001
errno = 0;
2002
/* Lower privileges */
2003
ret = seteuid(uid);
2004
if(ret == -1){
2005
perror_plus("seteuid");
2006
}
2464
2007
}
2465
2008
2466
2009
if(quit_now){
2467
2010
goto end;
2468
2011
}
2469
2012
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2013
ret = init_gnutls_global(pubkey, seckey);
2471
2014
if(ret == -1){
2472
2015
fprintf_plus(stderr, "init_gnutls_global failed\n");
2473
2016
exitcode = EX_UNAVAILABLE;
2480
2023
goto end;
2481
2024
}
2482
2025
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
2026
if(mkdtemp(tempdir) == NULL){
2493
2027
perror_plus("mkdtemp");
2494
2028
goto end;
2495
2029
}
2030
tempdir_created = true;
2496
2031
2497
2032
if(quit_now){
2498
2033
goto end;
2499
2034
}
2500
2035
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2036
if(not init_gpgme(pubkey, seckey, tempdir)){
2502
2037
fprintf_plus(stderr, "init_gpgme failed\n");
2503
2038
exitcode = EX_UNAVAILABLE;
2504
2039
goto end;
2514
2049
/* Connect directly, do not use Zeroconf */
2515
2050
/* (Mainly meant for debugging) */
2516
2051
char *address = strrchr(connect_to, ':');
2517
2518
2052
if(address == NULL){
2519
2053
fprintf_plus(stderr, "No colon in address\n");
2520
2054
exitcode = EX_USAGE;
2525
2059
goto end;
2526
2060
}
2527
2061
2528
in_port_t port;
2062
uint16_t port;
2529
2063
errno = 0;
2530
2064
tmpmax = strtoimax(address+1, &tmp, 10);
2531
2065
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2532
or tmpmax != (in_port_t)tmpmax){
2066
or tmpmax != (uint16_t)tmpmax){
2533
2067
fprintf_plus(stderr, "Bad port number\n");
2534
2068
exitcode = EX_USAGE;
2535
2069
goto end;
2536
2070
}
2537
2071
2538
2072
if(quit_now){
2539
2073
goto end;
2540
2074
}
2541
2075
2542
port = (in_port_t)tmpmax;
2076
port = (uint16_t)tmpmax;
2543
2077
*address = '\0';
2544
2078
/* Colon in address indicates IPv6 */
2545
2079
int af;
2561
2095
}
2562
2096
2563
2097
while(not quit_now){
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
2098
ret = start_mandos_communication(address, port, if_index, af);
2566
2099
if(quit_now or ret == 0){
2567
2100
break;
2568
2101
}
2570
2103
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
2104
(int)retry_interval);
2572
2105
}
2573
sleep((unsigned int)retry_interval);
2106
sleep((int)retry_interval);
2574
2107
}
2575
2108
2576
if(not quit_now){
2109
if (not quit_now){
2577
2110
exitcode = EXIT_SUCCESS;
2578
2111
}
2579
2112
2594
2127
config.publish_domain = 0;
2595
2128
2596
2129
/* Allocate a new server */
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
2130
mc.server = avahi_server_new(avahi_simple_poll_get
2131
(mc.simple_poll), &config, NULL,
2132
NULL, &error);
2599
2133
2600
2134
/* Free the Avahi configuration data */
2601
2135
avahi_server_config_free(&config);
2604
2138
/* Check if creating the Avahi server object succeeded */
2605
2139
if(mc.server == NULL){
2606
2140
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
2141
avahi_strerror(error));
2608
2142
exitcode = EX_UNAVAILABLE;
2609
2143
goto end;
2610
2144
}
2616
2150
/* Create the Avahi service browser */
2617
2151
sb = avahi_s_service_browser_new(mc.server, if_index,
2618
2152
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
2153
NULL, 0, browse_callback, NULL);
2621
2154
if(sb == NULL){
2622
2155
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
2156
avahi_strerror(avahi_server_errno(mc.server)));
2634
2167
if(debug){
2635
2168
fprintf_plus(stderr, "Starting Avahi loop search\n");
2636
2169
}
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
2170
2171
ret = avahi_loop_with_timeout(mc.simple_poll,
2172
(int)(retry_interval * 1000));
2640
2173
if(debug){
2641
2174
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
2175
(ret == 0) ? "successfully" : "with error");
2649
2182
}
2650
2183
2651
2184
/* Cleanup things */
2652
free(mc.interfaces);
2653
2654
2185
if(sb != NULL)
2655
2186
avahi_s_service_browser_free(sb);
2656
2187
2657
2188
if(mc.server != NULL)
2658
2189
avahi_server_free(mc.server);
2659
2190
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
2191
if(mc.simple_poll != NULL)
2192
avahi_simple_poll_free(mc.simple_poll);
2662
2193
2663
2194
if(gnutls_initialized){
2664
2195
gnutls_certificate_free_credentials(mc.cred);
2669
2200
if(gpgme_initialized){
2670
2201
gpgme_release(mc.ctx);
2671
2202
}
2672
2203
2673
2204
/* Cleans up the circular linked list of Mandos servers the client
2674
2205
has seen */
2675
2206
if(mc.current_server != NULL){
2676
2207
mc.current_server->prev->next = NULL;
2677
2208
while(mc.current_server != NULL){
2678
2209
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
2687
2210
free(mc.current_server);
2688
2211
mc.current_server = next;
2689
2212
}
2690
2213
}
2691
2214
2692
/* Re-raise privileges */
2215
/* Re-raise priviliges */
2693
2216
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2217
if(getuid() == 0){
2218
errno = 0;
2219
ret = seteuid(0);
2220
if(ret == -1){
2221
perror_plus("seteuid");
2720
2222
}
2721
2223
}
2224
/* Run network hooks */
2225
if(not run_network_hooks("stop", interface, delay)){
2226
goto end;
2227
}
2722
2228
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
2727
}
2728
}
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2229
/* Take down the network interface */
2230
if(take_down_interface and geteuid() == 0){
2231
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2232
if(ret == -1){
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2237
if(ret == -1){
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2239
}
2240
}
2241
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2242
if(ret == -1){
2243
perror_plus("close");
2244
}
2245
}
2246
}
2247
if(getuid() == 0){
2248
/* Lower privileges permanently */
2249
errno = 0;
2250
ret = setuid(uid);
2251
if(ret == -1){
2252
perror_plus("setuid");
2253
}
2254
}
2732
2255
2733
2256
/* Removes the GPGME temp directory and all files inside */
2734
if(tempdir != NULL){
2257
if(tempdir_created){
2735
2258
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2259
struct dirent *direntry = NULL;
2260
int numentries = scandir(tempdir, &direntries, notdotentries,
2261
alphasort);
2262
if (numentries > 0){
2263
for(int i = 0; i < numentries; i++){
2264
direntry = direntries[i];
2265
char *fullname = NULL;
2266
ret = asprintf(&fullname, "%s/%s", tempdir,
2267
direntry->d_name);
2268
if(ret < 0){
2269
perror_plus("asprintf");
2270
continue;
2271
}
2272
ret = remove(fullname);
2273
if(ret == -1){
2274
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2275
strerror(errno));
2276
}
2277
free(fullname);
2773
2278
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2279
}
2280
2281
/* need to clean even if 0 because man page doesn't specify */
2282
free(direntries);
2283
if (numentries == -1){
2284
perror_plus("scandir");
2285
}
2286
ret = rmdir(tempdir);
2287
if(ret == -1 and errno != ENOENT){
2288
perror_plus("rmdir");
2775
2289
}
2776
2290
}
2777
2291
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0