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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (505.2.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- 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
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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() */
58
inet_pton(), connect() */
60
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() */
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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,
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
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() */
97
91
98
92
#ifdef __linux__
99
93
#include <sys/klog.h> /* klogctl() */
141
135
static const char sys_class_net[] = "/sys/class/net";
142
136
char *connect_to = NULL;
143
137
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
138
147
139
/* Doubly linked list that need to be circularly linked when used */
148
140
typedef struct server{
149
141
const char *ip;
150
in_port_t port;
142
uint16_t port;
151
143
AvahiIfIndex if_index;
152
144
int af;
153
145
struct timespec last_seen;
157
149
158
150
/* Used for passing in values through the Avahi callback functions */
159
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
160
153
AvahiServer *server;
161
154
gnutls_certificate_credentials_t cred;
162
155
unsigned int dh_bits;
164
157
const char *priority;
165
158
gpgme_ctx_t ctx;
166
159
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
160
} mandos_context;
170
161
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
167
174
168
sig_atomic_t quit_now = 0;
175
169
int signal_received = 0;
176
170
177
171
/* Function to use when printing errors */
178
172
void perror_plus(const char *print_text){
179
int e = errno;
180
173
fprintf(stderr, "Mandos plugin %s: ",
181
174
program_invocation_short_name);
182
errno = e;
183
175
perror(print_text);
184
176
}
185
177
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
178
int fprintf_plus(FILE *stream, const char *format, ...){
188
179
va_list ap;
189
180
va_start (ap, format);
190
181
191
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
183
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
185
}
195
186
196
187
/*
198
189
* bytes. "buffer_capacity" is how much is currently allocated,
199
190
* "buffer_length" is how much is already used.
200
191
*/
201
__attribute__((nonnull, warn_unused_result))
202
192
size_t incbuffer(char **buffer, size_t buffer_length,
203
193
size_t buffer_capacity){
204
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
211
197
return 0;
212
198
}
213
*buffer = new_buf;
214
199
buffer_capacity += BUFFER_SIZE;
215
200
}
216
201
return buffer_capacity;
217
202
}
218
203
219
204
/* Add server to set of servers to retry periodically */
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
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
223
207
int ret;
224
208
server *new_server = malloc(sizeof(server));
225
209
if(new_server == NULL){
226
210
perror_plus("malloc");
227
return false;
211
return -1;
228
212
}
229
213
*new_server = (server){ .ip = strdup(ip),
230
214
.port = port,
232
216
.af = af };
233
217
if(new_server->ip == NULL){
234
218
perror_plus("strdup");
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;
219
return -1;
241
220
}
242
221
/* Special case of first server */
243
if(*current_server == NULL){
222
if (mc.current_server == NULL){
244
223
new_server->next = new_server;
245
224
new_server->prev = new_server;
246
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
247
227
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
251
230
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
255
239
}
256
240
257
241
/*
258
242
* Initialize GPGME.
259
243
*/
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
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
265
246
gpgme_error_t rc;
266
247
gpgme_engine_info_t engine_info;
267
248
249
268
250
/*
269
251
* Helper function to insert pub and seckey to the engine keyring.
270
252
*/
271
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
272
254
int ret;
273
255
int fd;
274
256
gpgme_data_t pgp_data;
286
268
return false;
287
269
}
288
270
289
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
290
272
if(rc != GPG_ERR_NO_ERROR){
291
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
274
gpgme_strsource(rc), gpgme_strerror(rc));
336
318
}
337
319
338
320
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
340
322
if(rc != GPG_ERR_NO_ERROR){
341
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
337
* Decrypt OpenPGP data.
356
338
* Returns -1 on error
357
339
*/
358
__attribute__((nonnull, warn_unused_result))
359
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
341
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
342
char **plaintext){
363
343
gpgme_data_t dh_crypto, dh_plain;
364
344
gpgme_error_t rc;
365
345
ssize_t ret;
391
371
392
372
/* Decrypt data from the cryptotext data buffer to the plaintext
393
373
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
375
if(rc != GPG_ERR_NO_ERROR){
396
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
377
gpgme_strsource(rc), gpgme_strerror(rc));
398
378
plaintext_length = -1;
399
379
if(debug){
400
380
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
402
382
if(result == NULL){
403
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
404
384
} else {
481
461
return plaintext_length;
482
462
}
483
463
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
487
467
if(ret == NULL)
488
468
ret = "(unknown)";
489
469
return ret;
490
470
}
491
471
492
472
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
473
static void debuggnutls(__attribute__((unused)) int level,
495
474
const char* string){
496
475
fprintf_plus(stderr, "GnuTLS: %s", string);
497
476
}
498
477
499
__attribute__((nonnull, warn_unused_result))
500
478
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
479
const char *seckeyfilename){
503
480
int ret;
504
481
505
482
if(debug){
522
499
}
523
500
524
501
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
503
if(ret != GNUTLS_E_SUCCESS){
527
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
505
safer_gnutls_strerror(ret));
538
515
}
539
516
540
517
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
542
519
GNUTLS_OPENPGP_FMT_BASE64);
543
520
if(ret != GNUTLS_E_SUCCESS){
544
521
fprintf_plus(stderr,
550
527
}
551
528
552
529
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
554
531
if(ret != GNUTLS_E_SUCCESS){
555
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
533
" initialization: %s\n",
557
534
safer_gnutls_strerror(ret));
558
535
goto globalfail;
559
536
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
538
if(ret != GNUTLS_E_SUCCESS){
562
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
540
safer_gnutls_strerror(ret));
564
541
goto globalfail;
565
542
}
566
543
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
545
569
546
return 0;
570
547
571
548
globalfail:
572
549
573
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
574
551
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
576
553
return -1;
577
554
}
578
555
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
582
557
int ret;
583
558
/* GnuTLS session creation */
584
559
do {
596
571
{
597
572
const char *err;
598
573
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
575
if(quit_now){
601
576
gnutls_deinit(*session);
602
577
return -1;
613
588
614
589
do {
615
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
591
mc.cred);
617
592
if(quit_now){
618
593
gnutls_deinit(*session);
619
594
return -1;
629
604
/* ignore client certificate if any. */
630
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
606
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
608
634
609
return 0;
635
610
}
639
614
__attribute__((unused)) const char *txt){}
640
615
641
616
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
644
618
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
619
int af){
646
620
int ret, tcp_sd = -1;
647
621
ssize_t sret;
648
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
649
626
char *buffer = NULL;
650
627
char *decrypted_buffer = NULL;
651
628
size_t buffer_length = 0;
675
652
return -1;
676
653
}
677
654
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);
655
ret = init_gnutls_session(&session);
711
656
if(ret != 0){
712
657
return -1;
713
658
}
714
659
715
660
if(debug){
716
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
718
663
}
719
664
720
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
677
733
678
memset(&to, 0, sizeof(to));
734
679
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
682
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
740
685
}
741
686
if(ret < 0 ){
742
687
int e = errno;
751
696
goto mandos_end;
752
697
}
753
698
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
757
706
if(if_index == AVAHI_IF_UNSPEC){
758
707
fprintf_plus(stderr, "An IPv6 link-local address is"
759
708
" incomplete without a network interface\n");
761
710
goto mandos_end;
762
711
}
763
712
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
765
714
}
766
715
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
768
719
}
769
720
770
721
if(quit_now){
778
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
730
perror_plus("if_indextoname");
780
731
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
783
734
}
784
735
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
787
738
}
788
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
790
742
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
795
745
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
800
748
}
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);
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
807
755
}
808
756
}
809
757
813
761
}
814
762
815
763
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
765
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
767
}
822
768
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
770
int e = errno;
825
771
perror_plus("connect");
826
772
errno = e;
872
818
goto mandos_end;
873
819
}
874
820
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);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
823
881
824
if(quit_now){
882
825
errno = EINTR;
987
930
if(buffer_length > 0){
988
931
ssize_t decrypted_buffer_size;
989
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
933
&decrypted_buffer);
991
934
if(decrypted_buffer_size >= 0){
992
935
993
936
written = 0;
1041
984
return retval;
1042
985
}
1043
986
1044
__attribute__((nonnull))
1045
987
static void resolve_callback(AvahiSServiceResolver *r,
1046
988
AvahiIfIndex interface,
1047
989
AvahiProtocol proto,
1055
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
999
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1062
1002
1063
1003
/* Called whenever a service has been resolved successfully or
1064
1004
timed out */
1073
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
1015
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1078
1017
break;
1079
1018
1080
1019
case AVAHI_RESOLVER_FOUND:
1086
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
1026
host_name, ip, (intmax_t)interface, port);
1088
1027
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1093
1030
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1095
1032
} else {
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
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1102
1035
}
1103
1036
}
1104
1037
}
1114
1047
const char *domain,
1115
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1049
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1121
1052
1122
1053
/* Called whenever a new services becomes available on the LAN or
1123
1054
is removed from the LAN */
1131
1062
case AVAHI_BROWSER_FAILURE:
1132
1063
1133
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1137
1067
return;
1138
1068
1139
1069
case AVAHI_BROWSER_NEW:
1142
1072
the callback function is called the Avahi server will free the
1143
1073
resolver for us. */
1144
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1149
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
1079
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1153
1081
break;
1154
1082
1155
1083
case AVAHI_BROWSER_REMOVE:
1174
1102
signal_received = sig;
1175
1103
int old_errno = errno;
1176
1104
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1179
1107
}
1180
1108
errno = old_errno;
1181
1109
}
1182
1110
1183
__attribute__((nonnull, warn_unused_result))
1184
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
1112
int ret;
1186
error_t ret_errno;
1187
1113
1188
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
1115
if(s < 0){
1190
ret_errno = errno;
1191
1116
perror_plus("socket");
1192
errno = ret_errno;
1193
1117
return false;
1194
1118
}
1195
1119
strcpy(ifr->ifr_name, ifname);
1196
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
1121
if(ret == -1){
1198
1122
if(debug){
1199
ret_errno = errno;
1200
1123
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
1124
}
1203
1125
return false;
1204
1126
}
1205
1127
return true;
1206
1128
}
1207
1129
1208
__attribute__((nonnull, warn_unused_result))
1209
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1131
1211
1132
/* Reject the loopback device */
1253
1174
* corresponds to an acceptable network device.
1254
1175
* (This function is passed to scandir(3) as a filter function.)
1255
1176
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
1177
int good_interface(const struct dirent *if_entry){
1258
1178
if(if_entry->d_name[0] == '.'){
1259
1179
return 0;
1275
1195
}
1276
1196
1277
1197
/*
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))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1312
1240
int notdotentries(const struct dirent *direntry){
1313
1241
/* Skip "." and ".." */
1314
1242
if(direntry->d_name[0] == '.'
1321
1249
}
1322
1250
1323
1251
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
1252
int runnable_hook(const struct dirent *direntry){
1326
1253
int ret;
1327
1254
size_t sret;
1335
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
1263
"abcdefghijklmnopqrstuvwxyz"
1337
1264
"0123456789"
1338
"_.-");
1265
"_-");
1339
1266
if((direntry->d_name)[sret] != '\0'){
1340
1267
/* Contains non-allowed characters */
1341
1268
if(debug){
1359
1286
}
1360
1287
return 0;
1361
1288
}
1362
free(fullname);
1363
1289
if(not (S_ISREG(st.st_mode))){
1364
1290
/* Not a regular file */
1365
1291
if(debug){
1383
1309
return 1;
1384
1310
}
1385
1311
1386
__attribute__((nonnull, warn_unused_result))
1387
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1388
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1389
1313
int ret;
1390
1314
struct timespec now;
1391
1315
struct timespec waited_time;
1392
1316
intmax_t block_time;
1393
1317
1394
1318
while(true){
1395
if(mc->current_server == NULL){
1396
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1397
1321
fprintf_plus(stderr, "Wait until first server is found."
1398
1322
" No timeout!\n");
1399
1323
}
1400
1324
ret = avahi_simple_poll_iterate(s, -1);
1401
1325
} else {
1402
if(debug){
1326
if (debug){
1403
1327
fprintf_plus(stderr, "Check current_server if we should run"
1404
1328
" it, or wait\n");
1405
1329
}
1412
1336
/* Calculating in ms how long time between now and server
1413
1337
who we visted longest time ago. Now - last seen. */
1414
1338
waited_time.tv_sec = (now.tv_sec
1415
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1416
1340
waited_time.tv_nsec = (now.tv_nsec
1417
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1418
1342
/* total time is 10s/10,000ms.
1419
1343
Converting to s from ms by dividing by 1,000,
1420
1344
and ns to ms by dividing by 1,000,000. */
1422
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1423
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1424
1348
1425
if(debug){
1349
if (debug){
1426
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1427
1351
block_time);
1428
1352
}
1429
1353
1430
1354
if(block_time <= 0){
1431
ret = start_mandos_communication(mc->current_server->ip,
1432
mc->current_server->port,
1433
mc->current_server->if_index,
1434
mc->current_server->af, mc);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1435
1359
if(ret == 0){
1436
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1437
1361
return 0;
1438
1362
}
1439
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1440
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1441
1365
if(ret == -1){
1442
1366
perror_plus("clock_gettime");
1443
1367
return -1;
1444
1368
}
1445
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1446
1370
block_time = 0; /* Call avahi to find new Mandos
1447
1371
servers, but don't block */
1448
1372
}
1450
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1451
1375
}
1452
1376
if(ret != 0){
1453
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1454
1378
return (ret != 1) ? ret : 0;
1455
1379
}
1456
1380
}
1457
1381
}
1458
1382
}
1459
1383
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1478
if(ret_errno != 0){
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
if(setuid(0) == -1){
1483
ret_errno = errno;
1484
perror_plus("seteuid");
1485
}
1486
errno = old_errno;
1487
return ret_errno;
1488
}
1489
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1496
ret_errno = errno;
1497
perror_plus("seteuid");
1498
}
1499
errno = old_errno;
1500
return ret_errno;
1501
}
1502
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1509
ret_errno = errno;
1510
perror_plus("setuid");
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1518
1385
const float delay){
1519
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1520
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
1390
alphasort);
1522
1391
if(numhooks == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("scandir");
1530
}
1392
perror_plus("scandir");
1531
1393
} else {
1532
struct dirent *direntry;
1533
int ret;
1534
1394
int devnull = open("/dev/null", O_RDONLY);
1535
1395
for(int i = 0; i < numhooks; i++){
1536
1396
direntry = direntries[i];
1548
1408
if(hook_pid == 0){
1549
1409
/* Child */
1550
1410
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1553
_exit(EX_NOPERM);
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1554
1421
}
1555
1422
/* Set group */
1556
1423
errno = 0;
1557
1424
ret = setgid(0);
1558
1425
if(ret == -1){
1559
1426
perror_plus("setgid");
1560
_exit(EX_NOPERM);
1561
1427
}
1562
1428
/* Reset supplementary groups */
1563
1429
errno = 0;
1564
1430
ret = setgroups(0, NULL);
1565
1431
if(ret == -1){
1566
1432
perror_plus("setgroups");
1567
_exit(EX_NOPERM);
1568
}
1569
ret = dup2(devnull, STDIN_FILENO);
1570
if(ret == -1){
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1572
_exit(EX_OSERR);
1573
}
1574
ret = close(devnull);
1575
if(ret == -1){
1576
perror_plus("close");
1577
_exit(EX_OSERR);
1578
}
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
if(ret == -1){
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1582
_exit(EX_OSERR);
1583
}
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1584
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
1440
if(ret == -1){
1586
1441
perror_plus("setenv");
1591
1446
perror_plus("setenv");
1592
1447
_exit(EX_OSERR);
1593
1448
}
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1595
1450
if(ret == -1){
1596
1451
perror_plus("setenv");
1597
1452
_exit(EX_OSERR);
1602
1457
_exit(EX_OSERR);
1603
1458
}
1604
1459
char *delaystring;
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1460
ret = asprintf(&delaystring, "%f", delay);
1606
1461
if(ret == -1){
1607
1462
perror_plus("asprintf");
1608
1463
_exit(EX_OSERR);
1614
1469
_exit(EX_OSERR);
1615
1470
}
1616
1471
free(delaystring);
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1619
if(ret == -1){
1620
perror_plus("setenv");
1621
_exit(EX_OSERR);
1622
}
1623
}
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1627
}
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1628
1474
} else {
1629
1475
int status;
1630
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1661
1507
}
1662
1508
close(devnull);
1663
1509
}
1664
}
1665
1666
__attribute__((nonnull, warn_unused_result))
1667
error_t bring_up_interface(const char *const interface,
1668
const float delay){
1669
error_t old_errno = errno;
1670
int ret;
1671
struct ifreq network;
1672
unsigned int if_index = if_nametoindex(interface);
1673
if(if_index == 0){
1674
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1675
errno = old_errno;
1676
return ENXIO;
1677
}
1678
1679
if(quit_now){
1680
errno = old_errno;
1681
return EINTR;
1682
}
1683
1684
if(not interface_is_up(interface)){
1685
error_t ret_errno = 0, ioctl_errno = 0;
1686
if(not get_flags(interface, &network)){
1687
ret_errno = errno;
1688
fprintf_plus(stderr, "Failed to get flags for interface "
1689
"\"%s\"\n", interface);
1690
errno = old_errno;
1691
return ret_errno;
1692
}
1693
network.ifr_flags |= IFF_UP; /* set flag */
1694
1695
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
if(sd == -1){
1697
ret_errno = errno;
1698
perror_plus("socket");
1699
errno = old_errno;
1700
return ret_errno;
1701
}
1702
1703
if(quit_now){
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
if(ret == -1){
1706
perror_plus("close");
1707
}
1708
errno = old_errno;
1709
return EINTR;
1710
}
1711
1712
if(debug){
1713
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1714
interface);
1715
}
1716
1717
/* Raise privileges */
1718
ret_errno = raise_privileges();
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
1723
#ifdef __linux__
1724
int ret_linux;
1725
bool restore_loglevel = false;
1726
if(ret_errno == 0){
1727
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1728
messages about the network interface to mess up the prompt */
1729
ret_linux = klogctl(8, NULL, 5);
1730
if(ret_linux == -1){
1731
perror_plus("klogctl");
1732
} else {
1733
restore_loglevel = true;
1734
}
1735
}
1736
#endif /* __linux__ */
1737
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
ioctl_errno = errno;
1739
#ifdef __linux__
1740
if(restore_loglevel){
1741
ret_linux = klogctl(7, NULL, 0);
1742
if(ret_linux == -1){
1743
perror_plus("klogctl");
1744
}
1745
}
1746
#endif /* __linux__ */
1747
1748
/* If raise_privileges() succeeded above */
1749
if(ret_errno == 0){
1750
/* Lower privileges */
1751
ret_errno = lower_privileges();
1752
if(ret_errno != 0){
1753
errno = ret_errno;
1754
perror_plus("Failed to lower privileges");
1755
}
1756
}
1757
1758
/* Close the socket */
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1760
if(ret == -1){
1761
perror_plus("close");
1762
}
1763
1764
if(ret_setflags == -1){
1765
errno = ioctl_errno;
1766
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1767
errno = old_errno;
1768
return ioctl_errno;
1769
}
1770
} else if(debug){
1771
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1772
interface);
1773
}
1774
1775
/* Sleep checking until interface is running.
1776
Check every 0.25s, up to total time of delay */
1777
for(int i=0; i < delay * 4; i++){
1778
if(interface_is_running(interface)){
1779
break;
1780
}
1781
struct timespec sleeptime = { .tv_nsec = 250000000 };
1782
ret = nanosleep(&sleeptime, NULL);
1783
if(ret == -1 and errno != EINTR){
1784
perror_plus("nanosleep");
1785
}
1786
}
1787
1788
errno = old_errno;
1789
return 0;
1790
}
1791
1792
__attribute__((nonnull, warn_unused_result))
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
1795
struct ifreq network;
1796
unsigned int if_index = if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1799
errno = old_errno;
1800
return ENXIO;
1801
}
1802
if(interface_is_up(interface)){
1803
error_t ret_errno = 0, ioctl_errno = 0;
1804
if(not get_flags(interface, &network) and debug){
1805
ret_errno = errno;
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", interface);
1808
errno = old_errno;
1809
return ret_errno;
1810
}
1811
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
1813
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
if(sd == -1){
1815
ret_errno = errno;
1816
perror_plus("socket");
1817
errno = old_errno;
1818
return ret_errno;
1819
}
1820
1821
if(debug){
1822
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1823
interface);
1824
}
1825
1826
/* Raise privileges */
1827
ret_errno = raise_privileges();
1828
if(ret_errno != 0){
1829
perror_plus("Failed to raise privileges");
1830
}
1831
1832
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1833
ioctl_errno = errno;
1834
1835
/* If raise_privileges() succeeded above */
1836
if(ret_errno == 0){
1837
/* Lower privileges */
1838
ret_errno = lower_privileges();
1839
if(ret_errno != 0){
1840
errno = ret_errno;
1841
perror_plus("Failed to lower privileges");
1842
}
1843
}
1844
1845
/* Close the socket */
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
if(ret == -1){
1848
perror_plus("close");
1849
}
1850
1851
if(ret_setflags == -1){
1852
errno = ioctl_errno;
1853
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1854
errno = old_errno;
1855
return ioctl_errno;
1856
}
1857
} else if(debug){
1858
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1859
interface);
1860
}
1861
1862
errno = old_errno;
1863
return 0;
1510
return true;
1864
1511
}
1865
1512
1866
1513
int main(int argc, char *argv[]){
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
1871
1514
AvahiSServiceBrowser *sb = NULL;
1872
error_t ret_errno;
1515
int error;
1873
1516
int ret;
1874
1517
intmax_t tmpmax;
1875
1518
char *tmp;
1876
1519
int exitcode = EXIT_SUCCESS;
1877
char *interfaces_to_take_down = NULL;
1878
size_t interfaces_to_take_down_size = 0;
1879
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1880
char old_tempdir[] = "/tmp/mandosXXXXXX";
1881
char *tempdir = NULL;
1520
const char *interface = "";
1521
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
1524
uid_t uid;
1525
gid_t gid;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
1882
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1883
1529
const char *seckey = PATHDIR "/" SECKEY;
1884
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1885
char *interfaces_hooks = NULL;
1886
1531
1887
1532
bool gnutls_initialized = false;
1888
1533
bool gpgme_initialized = false;
1950
1595
.group = 2 },
1951
1596
{ .name = "retry", .key = 132,
1952
1597
.arg = "SECONDS",
1953
.doc = "Retry interval used when denied by the Mandos server",
1598
.doc = "Retry interval used when denied by the mandos server",
1954
1599
.group = 2 },
1955
1600
{ .name = "network-hook-dir", .key = 133,
1956
1601
.arg = "DIR",
1979
1624
connect_to = arg;
1980
1625
break;
1981
1626
case 'i': /* --interface */
1982
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1983
arg, (int)',');
1984
if(ret_errno != 0){
1985
argp_error(state, "%s", strerror(ret_errno));
1986
}
1627
interface = arg;
1987
1628
break;
1988
1629
case 's': /* --seckey */
1989
1630
seckey = arg;
2032
1673
argp_state_help(state, state->out_stream,
2033
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2034
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
2035
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2036
1679
exit(argp_err_exit_status);
2037
1680
break;
2066
1709
/* Work around Debian bug #633582:
2067
1710
<http://bugs.debian.org/633582> */
2068
1711
2069
/* Re-raise privileges */
2070
ret_errno = raise_privileges();
2071
if(ret_errno != 0){
2072
errno = ret_errno;
2073
perror_plus("Failed to raise privileges");
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
2074
1717
} else {
2075
1718
struct stat st;
2076
1719
2117
1760
}
2118
1761
2119
1762
/* Lower privileges */
2120
ret_errno = lower_privileges();
2121
if(ret_errno != 0){
2122
errno = ret_errno;
2123
perror_plus("Failed to lower privileges");
2124
}
2125
}
2126
}
2127
2128
/* Remove invalid interface names (except "none") */
2129
{
2130
char *interface = NULL;
2131
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2132
interface))){
2133
if(strcmp(interface, "none") != 0
2134
and if_nametoindex(interface) == 0){
2135
if(interface[0] != '\0'){
2136
fprintf_plus(stderr, "Not using nonexisting interface"
2137
" \"%s\"\n", interface);
2138
}
2139
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2140
interface = NULL;
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
2141
1767
}
2142
1768
}
2143
1769
}
2144
1770
2145
1771
/* Run network hooks */
2146
{
2147
if(mc.interfaces != NULL){
2148
interfaces_hooks = malloc(mc.interfaces_size);
2149
if(interfaces_hooks == NULL){
2150
perror_plus("malloc");
2151
goto end;
2152
}
2153
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2154
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
}
2156
run_network_hooks("start", interfaces_hooks != NULL ?
2157
interfaces_hooks : "", delay);
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
2158
1774
}
2159
1775
2160
1776
if(not debug){
2161
1777
avahi_set_log_function(empty_log);
2162
1778
}
2163
1779
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2164
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2165
1813
from the signal handler */
2166
1814
/* Initialize the pseudo-RNG for Avahi */
2167
1815
srand((unsigned int) time(NULL));
2168
simple_poll = avahi_simple_poll_new();
2169
if(simple_poll == NULL){
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2170
1818
fprintf_plus(stderr,
2171
1819
"Avahi: Failed to create simple poll object.\n");
2172
1820
exitcode = EX_UNAVAILABLE;
2236
1884
}
2237
1885
}
2238
1886
2239
/* If no interfaces were specified, make a list */
2240
if(mc.interfaces == NULL){
2241
struct dirent **direntries;
2242
/* Look for any good interfaces */
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2244
alphasort);
2245
if(ret >= 1){
2246
/* Add all found interfaces to interfaces list */
2247
for(int i = 0; i < ret; ++i){
2248
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2249
direntries[i]->d_name);
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("argz_add");
2253
continue;
2254
}
2255
if(debug){
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2257
direntries[i]->d_name);
2258
}
2259
}
2260
free(direntries);
2261
} else {
2262
free(direntries);
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2264
exitcode = EXIT_FAILURE;
2265
goto end;
2266
}
2267
}
2268
2269
/* Bring up interfaces which are down, and remove any "none"s */
2270
{
2271
char *interface = NULL;
2272
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2273
interface))){
2274
/* If interface name is "none", stop bringing up interfaces.
2275
Also remove all instances of "none" from the list */
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
while((interface = argz_next(mc.interfaces,
2281
mc.interfaces_size, interface))){
2282
if(strcmp(interface, "none") == 0){
2283
argz_delete(&mc.interfaces, &mc.interfaces_size,
2284
interface);
2285
interface = NULL;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1907
#ifdef __linux__
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1912
if(ret == -1){
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1915
}
1916
#endif /* __linux__ */
1917
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1922
#ifdef __linux__
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
goto end;
1937
}
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1942
#ifdef __linux__
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1945
if(ret == -1){
1946
perror_plus("klogctl");
1947
}
1948
}
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1957
goto end;
1958
}
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1967
#ifdef __linux__
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1970
if(ret == -1){
1971
perror_plus("klogctl");
2286
1972
}
2287
1973
}
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
goto end;
1982
}
1983
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
2288
1991
break;
2289
1992
}
2290
bool interface_was_up = interface_is_up(interface);
2291
errno = bring_up_interface(interface, delay);
2292
if(not interface_was_up){
2293
if(errno != 0){
2294
perror_plus("Failed to bring up interface");
2295
} else {
2296
errno = argz_add(&interfaces_to_take_down,
2297
&interfaces_to_take_down_size,
2298
interface);
2299
if(errno != 0){
2300
perror_plus("argz_add");
2301
}
2302
}
2303
}
2304
}
2305
if(debug and (interfaces_to_take_down == NULL)){
2306
fprintf_plus(stderr, "No interfaces were brought up\n");
2307
}
2308
}
2309
2310
/* If we only got one interface, explicitly use only that one */
2311
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
if(debug){
2313
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2314
mc.interfaces);
2315
}
2316
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1997
}
1998
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
2005
}
2006
#ifdef __linux__
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2010
if(ret == -1){
2011
perror_plus("klogctl");
2012
}
2013
}
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2317
2022
}
2318
2023
2319
2024
if(quit_now){
2320
2025
goto end;
2321
2026
}
2322
2027
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
2028
ret = init_gnutls_global(pubkey, seckey);
2324
2029
if(ret == -1){
2325
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2326
2031
exitcode = EX_UNAVAILABLE;
2333
2038
goto end;
2334
2039
}
2335
2040
2336
/* Try /run/tmp before /tmp */
2337
tempdir = mkdtemp(run_tempdir);
2338
if(tempdir == NULL and errno == ENOENT){
2339
if(debug){
2340
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2341
run_tempdir, old_tempdir);
2342
}
2343
tempdir = mkdtemp(old_tempdir);
2344
}
2345
if(tempdir == NULL){
2041
if(mkdtemp(tempdir) == NULL){
2346
2042
perror_plus("mkdtemp");
2347
2043
goto end;
2348
2044
}
2045
tempdir_created = true;
2349
2046
2350
2047
if(quit_now){
2351
2048
goto end;
2352
2049
}
2353
2050
2354
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2355
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2356
2053
exitcode = EX_UNAVAILABLE;
2357
2054
goto end;
2367
2064
/* Connect directly, do not use Zeroconf */
2368
2065
/* (Mainly meant for debugging) */
2369
2066
char *address = strrchr(connect_to, ':');
2370
2371
2067
if(address == NULL){
2372
2068
fprintf_plus(stderr, "No colon in address\n");
2373
2069
exitcode = EX_USAGE;
2378
2074
goto end;
2379
2075
}
2380
2076
2381
in_port_t port;
2077
uint16_t port;
2382
2078
errno = 0;
2383
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2384
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2385
or tmpmax != (in_port_t)tmpmax){
2081
or tmpmax != (uint16_t)tmpmax){
2386
2082
fprintf_plus(stderr, "Bad port number\n");
2387
2083
exitcode = EX_USAGE;
2388
2084
goto end;
2389
2085
}
2390
2086
2391
2087
if(quit_now){
2392
2088
goto end;
2393
2089
}
2394
2090
2395
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2396
2092
*address = '\0';
2397
2093
/* Colon in address indicates IPv6 */
2398
2094
int af;
2414
2110
}
2415
2111
2416
2112
while(not quit_now){
2417
ret = start_mandos_communication(address, port, if_index, af,
2418
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2419
2114
if(quit_now or ret == 0){
2420
2115
break;
2421
2116
}
2423
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2424
2119
(int)retry_interval);
2425
2120
}
2426
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2427
2122
}
2428
2123
2429
if(not quit_now){
2124
if (not quit_now){
2430
2125
exitcode = EXIT_SUCCESS;
2431
2126
}
2432
2127
2447
2142
config.publish_domain = 0;
2448
2143
2449
2144
/* Allocate a new server */
2450
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2451
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2452
2148
2453
2149
/* Free the Avahi configuration data */
2454
2150
avahi_server_config_free(&config);
2457
2153
/* Check if creating the Avahi server object succeeded */
2458
2154
if(mc.server == NULL){
2459
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2460
avahi_strerror(ret_errno));
2156
avahi_strerror(error));
2461
2157
exitcode = EX_UNAVAILABLE;
2462
2158
goto end;
2463
2159
}
2469
2165
/* Create the Avahi service browser */
2470
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2471
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2472
NULL, 0, browse_callback,
2473
(void *)&mc);
2168
NULL, 0, browse_callback, NULL);
2474
2169
if(sb == NULL){
2475
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2476
2171
avahi_strerror(avahi_server_errno(mc.server)));
2487
2182
if(debug){
2488
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2489
2184
}
2490
2491
ret = avahi_loop_with_timeout(simple_poll,
2492
(int)(retry_interval * 1000), &mc);
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2493
2188
if(debug){
2494
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2495
2190
(ret == 0) ? "successfully" : "with error");
2502
2197
}
2503
2198
2504
2199
/* Cleanup things */
2505
free(mc.interfaces);
2506
2507
2200
if(sb != NULL)
2508
2201
avahi_s_service_browser_free(sb);
2509
2202
2510
2203
if(mc.server != NULL)
2511
2204
avahi_server_free(mc.server);
2512
2205
2513
if(simple_poll != NULL)
2514
avahi_simple_poll_free(simple_poll);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2515
2208
2516
2209
if(gnutls_initialized){
2517
2210
gnutls_certificate_free_credentials(mc.cred);
2534
2227
}
2535
2228
}
2536
2229
2537
/* Re-raise privileges */
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2538
2234
{
2539
ret_errno = raise_privileges();
2540
if(ret_errno != 0){
2541
perror_plus("Failed to raise privileges");
2542
} else {
2543
2544
/* Run network hooks */
2545
run_network_hooks("stop", interfaces_hooks != NULL ?
2546
interfaces_hooks : "", delay);
2547
2548
/* Take down the network interfaces which were brought up */
2549
{
2550
char *interface = NULL;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2553
interface))){
2554
ret_errno = take_down_interface(interface);
2555
if(ret_errno != 0){
2556
errno = ret_errno;
2557
perror_plus("Failed to take down interface");
2558
}
2559
}
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces needed to be taken"
2562
" down\n");
2563
}
2564
}
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2565
2239
}
2566
2240
2567
ret_errno = lower_privileges_permanently();
2568
if(ret_errno != 0){
2569
perror_plus("Failed to lower privileges permanently");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2570
2257
}
2571
2258
}
2572
2573
free(interfaces_to_take_down);
2574
free(interfaces_hooks);
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2575
2265
2576
2266
/* Removes the GPGME temp directory and all files inside */
2577
if(tempdir != NULL){
2267
if(tempdir_created){
2578
2268
struct dirent **direntries = NULL;
2579
2269
struct dirent *direntry = NULL;
2580
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2581
2271
alphasort);
2582
if(numentries > 0){
2272
if (numentries > 0){
2583
2273
for(int i = 0; i < numentries; i++){
2584
2274
direntry = direntries[i];
2585
2275
char *fullname = NULL;
2597
2287
free(fullname);
2598
2288
}
2599
2289
}
2600
2290
2601
2291
/* need to clean even if 0 because man page doesn't specify */
2602
2292
free(direntries);
2603
if(numentries == -1){
2293
if (numentries == -1){
2604
2294
perror_plus("scandir");
2605
2295
}
2606
2296
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0