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237.7.216
(compared to revision 237.7.142)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- debian/upstream-signing-key.pgp
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
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, inet_ntop() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
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() */
91
97
92
98
#ifdef __linux__
93
99
#include <sys/klog.h> /* klogctl() */
135
141
static const char sys_class_net[] = "/sys/class/net";
136
142
char *connect_to = NULL;
137
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
138
146
139
147
/* Doubly linked list that need to be circularly linked when used */
140
148
typedef struct server{
141
149
const char *ip;
142
uint16_t port;
150
in_port_t port;
143
151
AvahiIfIndex if_index;
144
152
int af;
145
153
struct timespec last_seen;
149
157
150
158
/* Used for passing in values through the Avahi callback functions */
151
159
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
160
AvahiServer *server;
154
161
gnutls_certificate_credentials_t cred;
155
162
unsigned int dh_bits;
157
164
const char *priority;
158
165
gpgme_ctx_t ctx;
159
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
160
169
} mandos_context;
161
170
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 };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
167
173
168
174
sig_atomic_t quit_now = 0;
169
175
int signal_received = 0;
184
190
185
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
192
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
194
}
189
195
190
196
/*
195
201
size_t incbuffer(char **buffer, size_t buffer_length,
196
202
size_t buffer_capacity){
197
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
200
210
return 0;
201
211
}
212
*buffer = new_buf;
202
213
buffer_capacity += BUFFER_SIZE;
203
214
}
204
215
return buffer_capacity;
205
216
}
206
217
207
218
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
210
221
int ret;
211
222
server *new_server = malloc(sizeof(server));
212
223
if(new_server == NULL){
221
232
perror_plus("strdup");
222
233
return false;
223
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
224
240
/* Special case of first server */
225
if (mc.current_server == NULL){
241
if(*current_server == NULL){
226
242
new_server->next = new_server;
227
243
new_server->prev = new_server;
228
mc.current_server = new_server;
244
*current_server = new_server;
229
245
/* Place the new server last in the list */
230
246
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
233
249
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
250
(*current_server)->prev = new_server;
240
251
}
241
252
return true;
242
253
}
245
256
* Initialize GPGME.
246
257
*/
247
258
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
259
const char *tempdir, mandos_context *mc){
249
260
gpgme_error_t rc;
250
261
gpgme_engine_info_t engine_info;
251
262
252
253
263
/*
254
264
* Helper function to insert pub and seckey to the engine keyring.
255
265
*/
271
281
return false;
272
282
}
273
283
274
rc = gpgme_op_import(mc.ctx, pgp_data);
284
rc = gpgme_op_import(mc->ctx, pgp_data);
275
285
if(rc != GPG_ERR_NO_ERROR){
276
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
287
gpgme_strsource(rc), gpgme_strerror(rc));
321
331
}
322
332
323
333
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
334
rc = gpgme_new(&(mc->ctx));
325
335
if(rc != GPG_ERR_NO_ERROR){
326
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
352
*/
343
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
354
size_t crypto_size,
345
char **plaintext){
355
char **plaintext,
356
mandos_context *mc){
346
357
gpgme_data_t dh_crypto, dh_plain;
347
358
gpgme_error_t rc;
348
359
ssize_t ret;
374
385
375
386
/* Decrypt data from the cryptotext data buffer to the plaintext
376
387
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
389
if(rc != GPG_ERR_NO_ERROR){
379
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
391
gpgme_strsource(rc), gpgme_strerror(rc));
381
392
plaintext_length = -1;
382
393
if(debug){
383
394
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
395
result = gpgme_op_decrypt_result(mc->ctx);
385
396
if(result == NULL){
386
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
398
} else {
465
476
}
466
477
467
478
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
479
const char *ret = gnutls_strerror(value);
470
480
if(ret == NULL)
471
481
ret = "(unknown)";
472
482
return ret;
479
489
}
480
490
481
491
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
492
const char *seckeyfilename,
493
mandos_context *mc){
483
494
int ret;
484
495
485
496
if(debug){
502
513
}
503
514
504
515
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
517
if(ret != GNUTLS_E_SUCCESS){
507
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
519
safer_gnutls_strerror(ret));
518
529
}
519
530
520
531
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
532
(mc->cred, pubkeyfilename, seckeyfilename,
522
533
GNUTLS_OPENPGP_FMT_BASE64);
523
534
if(ret != GNUTLS_E_SUCCESS){
524
535
fprintf_plus(stderr,
530
541
}
531
542
532
543
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
544
ret = gnutls_dh_params_init(&mc->dh_params);
534
545
if(ret != GNUTLS_E_SUCCESS){
535
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
547
" initialization: %s\n",
537
548
safer_gnutls_strerror(ret));
538
549
goto globalfail;
539
550
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
552
if(ret != GNUTLS_E_SUCCESS){
542
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
554
safer_gnutls_strerror(ret));
544
555
goto globalfail;
545
556
}
546
557
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
559
549
560
return 0;
550
561
551
562
globalfail:
552
563
553
gnutls_certificate_free_credentials(mc.cred);
564
gnutls_certificate_free_credentials(mc->cred);
554
565
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
566
gnutls_dh_params_deinit(mc->dh_params);
556
567
return -1;
557
568
}
558
569
559
static int init_gnutls_session(gnutls_session_t *session){
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
560
572
int ret;
561
573
/* GnuTLS session creation */
562
574
do {
574
586
{
575
587
const char *err;
576
588
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
590
if(quit_now){
579
591
gnutls_deinit(*session);
580
592
return -1;
591
603
592
604
do {
593
605
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
606
mc->cred);
595
607
if(quit_now){
596
608
gnutls_deinit(*session);
597
609
return -1;
607
619
/* ignore client certificate if any. */
608
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
621
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
623
612
624
return 0;
613
625
}
617
629
__attribute__((unused)) const char *txt){}
618
630
619
631
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
632
static int start_mandos_communication(const char *ip, in_port_t port,
621
633
AvahiIfIndex if_index,
622
int af){
634
int af, mandos_context *mc){
623
635
int ret, tcp_sd = -1;
624
636
ssize_t sret;
625
637
union {
655
667
return -1;
656
668
}
657
669
658
ret = init_gnutls_session(&session);
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
673
bool match = false;
674
{
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
678
if(if_nametoindex(interface) == (unsigned int)if_index){
679
match = true;
680
break;
681
}
682
}
683
}
684
if(not match){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
687
if(debug){
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
691
} else {
692
fprintf_plus(stderr, "Skipping server on non-used interface"
693
" \"%s\"\n",
694
if_indextoname((unsigned int)if_index,
695
interface));
696
}
697
}
698
return -1;
699
}
700
}
701
702
ret = init_gnutls_session(&session, mc);
659
703
if(ret != 0){
660
704
return -1;
661
705
}
662
706
663
707
if(debug){
664
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
709
PRIuMAX "\n", ip, (uintmax_t)port);
666
710
}
667
711
668
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
699
743
goto mandos_end;
700
744
}
701
745
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
706
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
709
756
if(if_index == AVAHI_IF_UNSPEC){
710
757
fprintf_plus(stderr, "An IPv6 link-local address is"
711
758
" incomplete without a network interface\n");
716
763
to.in6.sin6_scope_id = (uint32_t)if_index;
717
764
}
718
765
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
766
to.in.sin_port = htons(port);
722
767
}
723
768
724
769
if(quit_now){
732
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
778
perror_plus("if_indextoname");
734
779
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
737
782
}
738
783
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
741
786
}
742
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
789
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
748
793
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
751
797
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
804
}
759
805
}
760
806
936
982
if(buffer_length > 0){
937
983
ssize_t decrypted_buffer_size;
938
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
985
&decrypted_buffer, mc);
940
986
if(decrypted_buffer_size >= 0){
941
987
942
988
written = 0;
1003
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1051
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1052
void* mc){
1053
if(r == NULL){
1054
return;
1055
}
1008
1056
1009
1057
/* Called whenever a service has been resolved successfully or
1010
1058
timed out */
1019
1067
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1068
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1069
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_strerror(avahi_server_errno
1071
(((mandos_context*)mc)->server)));
1023
1072
break;
1024
1073
1025
1074
case AVAHI_RESOLVER_FOUND:
1031
1080
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1081
host_name, ip, (intmax_t)interface, port);
1033
1082
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1083
int ret = start_mandos_communication(ip, (in_port_t)port,
1084
interface,
1085
avahi_proto_to_af(proto),
1086
mc);
1036
1087
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1088
avahi_simple_poll_quit(simple_poll);
1038
1089
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1090
if(not add_server(ip, (in_port_t)port, interface,
1091
avahi_proto_to_af(proto),
1092
&((mandos_context*)mc)->current_server)){
1041
1093
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1094
" list\n", name);
1043
1095
}
1056
1108
const char *domain,
1057
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1110
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1111
void* mc){
1112
if(b == NULL){
1113
return;
1114
}
1061
1115
1062
1116
/* Called whenever a new services becomes available on the LAN or
1063
1117
is removed from the LAN */
1071
1125
case AVAHI_BROWSER_FAILURE:
1072
1126
1073
1127
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1128
avahi_strerror(avahi_server_errno
1129
(((mandos_context*)mc)->server)));
1130
avahi_simple_poll_quit(simple_poll);
1076
1131
return;
1077
1132
1078
1133
case AVAHI_BROWSER_NEW:
1081
1136
the callback function is called the Avahi server will free the
1082
1137
resolver for us. */
1083
1138
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1139
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1140
interface, protocol, name, type,
1141
domain, protocol, 0,
1142
resolve_callback, mc) == NULL)
1087
1143
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1144
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1145
avahi_strerror(avahi_server_errno
1146
(((mandos_context*)mc)->server)));
1090
1147
break;
1091
1148
1092
1149
case AVAHI_BROWSER_REMOVE:
1111
1168
signal_received = sig;
1112
1169
int old_errno = errno;
1113
1170
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1116
1173
}
1117
1174
errno = old_errno;
1118
1175
}
1119
1176
1120
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1178
int ret;
1179
error_t ret_errno;
1122
1180
1123
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1182
if(s < 0){
1183
ret_errno = errno;
1125
1184
perror_plus("socket");
1185
errno = ret_errno;
1126
1186
return false;
1127
1187
}
1128
1188
strcpy(ifr->ifr_name, ifname);
1129
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1190
if(ret == -1){
1131
1191
if(debug){
1192
ret_errno = errno;
1132
1193
perror_plus("ioctl SIOCGIFFLAGS");
1194
errno = ret_errno;
1133
1195
}
1134
1196
return false;
1135
1197
}
1204
1266
}
1205
1267
1206
1268
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1269
* This function determines if a network interface is up.
1270
*/
1271
bool interface_is_up(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1282
}
1283
1284
/*
1285
* This function determines if a network interface is running
1286
*/
1287
bool interface_is_running(const char *interface){
1288
struct ifreq ifr;
1289
if(not get_flags(interface, &ifr)){
1290
if(debug){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1293
}
1294
return false;
1295
}
1296
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1298
}
1248
1299
1249
1300
int notdotentries(const struct dirent *direntry){
1318
1369
return 1;
1319
1370
}
1320
1371
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1322
1374
int ret;
1323
1375
struct timespec now;
1324
1376
struct timespec waited_time;
1325
1377
intmax_t block_time;
1326
1378
1327
1379
while(true){
1328
if(mc.current_server == NULL){
1380
if(mc->current_server == NULL){
1329
1381
if (debug){
1330
1382
fprintf_plus(stderr, "Wait until first server is found."
1331
1383
" No timeout!\n");
1345
1397
/* Calculating in ms how long time between now and server
1346
1398
who we visted longest time ago. Now - last seen. */
1347
1399
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1400
- mc->current_server->last_seen.tv_sec);
1349
1401
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1402
- mc->current_server->last_seen.tv_nsec);
1351
1403
/* total time is 10s/10,000ms.
1352
1404
Converting to s from ms by dividing by 1,000,
1353
1405
and ns to ms by dividing by 1,000,000. */
1361
1413
}
1362
1414
1363
1415
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1368
1420
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1421
avahi_simple_poll_quit(s);
1370
1422
return 0;
1371
1423
}
1372
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1425
&mc->current_server->last_seen);
1374
1426
if(ret == -1){
1375
1427
perror_plus("clock_gettime");
1376
1428
return -1;
1377
1429
}
1378
mc.current_server = mc.current_server->next;
1430
mc->current_server = mc->current_server->next;
1379
1431
block_time = 0; /* Call avahi to find new Mandos
1380
1432
servers, but don't block */
1381
1433
}
1390
1442
}
1391
1443
}
1392
1444
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1393
1497
bool run_network_hooks(const char *mode, const char *interface,
1394
1498
const float delay){
1395
1499
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
1501
alphasort);
1400
1502
if(numhooks == -1){
1401
perror_plus("scandir");
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
1510
}
1402
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1403
1514
int devnull = open("/dev/null", O_RDONLY);
1404
1515
for(int i = 0; i < numhooks; i++){
1405
1516
direntry = direntries[i];
1417
1528
if(hook_pid == 0){
1418
1529
/* Child */
1419
1530
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1531
raise_privileges_permanently();
1431
1532
/* Set group */
1432
1533
errno = 0;
1433
1534
ret = setgid(0);
1526
1627
return true;
1527
1628
}
1528
1629
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1638
if(if_index == 0){
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1640
errno = old_errno;
1641
return ENXIO;
1642
}
1643
1644
if(quit_now){
1645
errno = old_errno;
1646
return EINTR;
1647
}
1648
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1651
ret_errno = errno;
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1654
return ret_errno;
1655
}
1656
network.ifr_flags |= IFF_UP;
1657
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
1660
ret_errno = errno;
1661
perror_plus("socket");
1662
errno = old_errno;
1663
return ret_errno;
1664
}
1665
1666
if(quit_now){
1667
close(sd);
1668
errno = old_errno;
1669
return EINTR;
1670
}
1671
1672
if(debug){
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1674
interface);
1675
}
1676
1677
/* Raise priviliges */
1678
raise_privileges();
1679
1680
#ifdef __linux__
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1688
}
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
1692
#ifdef __linux__
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
1697
}
1698
}
1699
#endif /* __linux__ */
1700
1701
/* Lower privileges */
1702
lower_privileges();
1703
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1706
if(ret == -1){
1707
perror_plus("close");
1708
}
1709
1710
if(ret_setflags == -1){
1711
errno = ret_errno;
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
} else if(debug){
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1718
interface);
1719
}
1720
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1725
break;
1726
}
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1731
}
1732
}
1733
1734
errno = old_errno;
1735
return 0;
1736
}
1737
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1742
if(if_index == 0){
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1744
errno = old_errno;
1745
return ENXIO;
1746
}
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1750
ret_errno = errno;
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1753
return ret_errno;
1754
}
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1756
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1758
if(sd < 0){
1759
ret_errno = errno;
1760
perror_plus("socket");
1761
errno = old_errno;
1762
return ret_errno;
1763
}
1764
1765
if(debug){
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1767
interface);
1768
}
1769
1770
/* Raise priviliges */
1771
raise_privileges();
1772
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1774
ret_errno = errno;
1775
1776
/* Lower privileges */
1777
lower_privileges();
1778
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1781
if(ret == -1){
1782
perror_plus("close");
1783
}
1784
1785
if(ret_setflags == -1){
1786
errno = ret_errno;
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1788
errno = old_errno;
1789
return ret_errno;
1790
}
1791
} else if(debug){
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1793
interface);
1794
}
1795
1796
errno = old_errno;
1797
return 0;
1798
}
1799
1529
1800
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1530
1805
AvahiSServiceBrowser *sb = NULL;
1531
int error;
1806
error_t ret_errno;
1532
1807
int ret;
1533
1808
intmax_t tmpmax;
1534
1809
char *tmp;
1535
1810
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1542
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1543
1814
bool tempdir_created = false;
1544
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
1816
const char *seckey = PATHDIR "/" SECKEY;
1546
1817
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1547
1819
1548
1820
bool gnutls_initialized = false;
1549
1821
bool gpgme_initialized = false;
1640
1912
connect_to = arg;
1641
1913
break;
1642
1914
case 'i': /* --interface */
1643
interface = arg;
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1916
arg, (int)',');
1917
if(ret_errno != 0){
1918
argp_error(state, "%s", strerror(ret_errno));
1919
}
1644
1920
break;
1645
1921
case 's': /* --seckey */
1646
1922
seckey = arg;
1724
2000
<http://bugs.debian.org/633582> */
1725
2001
1726
2002
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
2003
if(raise_privileges() == 0){
1732
2004
struct stat st;
1733
2005
1734
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1774
2046
}
1775
2047
1776
2048
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2049
lower_privileges();
2050
}
2051
}
2052
2053
/* Remove invalid interface names (except "none") */
2054
{
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2057
interface))){
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2063
}
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2065
interface = NULL;
1781
2066
}
1782
2067
}
1783
2068
}
1784
2069
1785
2070
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2071
{
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
2076
goto end;
2077
}
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2080
}
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
1788
2085
}
1789
2086
1790
2087
if(not debug){
1791
2088
avahi_set_log_function(empty_log);
1792
2089
}
1793
2090
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2091
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2092
from the signal handler */
1828
2093
/* Initialize the pseudo-RNG for Avahi */
1829
2094
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
1832
2097
fprintf_plus(stderr,
1833
2098
"Avahi: Failed to create simple poll object.\n");
1834
2099
exitcode = EX_UNAVAILABLE;
1898
2163
}
1899
2164
}
1900
2165
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2171
alphasort);
2172
if(ret >= 1){
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2177
if(ret_errno != 0){
2178
errno = ret_errno;
2179
perror_plus("argz_add");
2180
continue;
2181
}
2182
if(debug){
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2185
}
2186
}
2187
free(direntries);
2188
} else {
2189
free(direntries);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2192
goto end;
2193
}
2194
}
2195
2196
/* Bring up interfaces which are down, and remove any "none"s */
2197
{
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2200
interface))){
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2211
interface);
2212
interface = NULL;
1986
2213
}
1987
2214
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2215
break;
2006
2216
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2223
} else {
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2229
perror_plus("argz_add");
2230
}
2231
}
2232
}
2233
}
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2236
}
2237
}
2238
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2241
if(debug){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2243
mc.interfaces);
2244
}
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2246
}
2037
2247
2038
2248
if(quit_now){
2039
2249
goto end;
2040
2250
}
2041
2251
2042
ret = init_gnutls_global(pubkey, seckey);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2043
2253
if(ret == -1){
2044
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2255
exitcode = EX_UNAVAILABLE;
2062
2272
goto end;
2063
2273
}
2064
2274
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2277
exitcode = EX_UNAVAILABLE;
2068
2278
goto end;
2078
2288
/* Connect directly, do not use Zeroconf */
2079
2289
/* (Mainly meant for debugging) */
2080
2290
char *address = strrchr(connect_to, ':');
2291
2081
2292
if(address == NULL){
2082
2293
fprintf_plus(stderr, "No colon in address\n");
2083
2294
exitcode = EX_USAGE;
2088
2299
goto end;
2089
2300
}
2090
2301
2091
uint16_t port;
2302
in_port_t port;
2092
2303
errno = 0;
2093
2304
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2306
or tmpmax != (in_port_t)tmpmax){
2096
2307
fprintf_plus(stderr, "Bad port number\n");
2097
2308
exitcode = EX_USAGE;
2098
2309
goto end;
2099
2310
}
2100
2311
2101
2312
if(quit_now){
2102
2313
goto end;
2103
2314
}
2104
2315
2105
port = (uint16_t)tmpmax;
2316
port = (in_port_t)tmpmax;
2106
2317
*address = '\0';
2107
2318
/* Colon in address indicates IPv6 */
2108
2319
int af;
2124
2335
}
2125
2336
2126
2337
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2338
ret = start_mandos_communication(address, port, if_index, af,
2339
&mc);
2128
2340
if(quit_now or ret == 0){
2129
2341
break;
2130
2342
}
2132
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2345
(int)retry_interval);
2134
2346
}
2135
sleep((int)retry_interval);
2347
sleep((unsigned int)retry_interval);
2136
2348
}
2137
2349
2138
2350
if (not quit_now){
2156
2368
config.publish_domain = 0;
2157
2369
2158
2370
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2162
2373
2163
2374
/* Free the Avahi configuration data */
2164
2375
avahi_server_config_free(&config);
2167
2378
/* Check if creating the Avahi server object succeeded */
2168
2379
if(mc.server == NULL){
2169
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2381
avahi_strerror(ret_errno));
2171
2382
exitcode = EX_UNAVAILABLE;
2172
2383
goto end;
2173
2384
}
2179
2390
/* Create the Avahi service browser */
2180
2391
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2393
NULL, 0, browse_callback,
2394
(void *)&mc);
2183
2395
if(sb == NULL){
2184
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2397
avahi_strerror(avahi_server_errno(mc.server)));
2197
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2410
}
2199
2411
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2202
2414
if(debug){
2203
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2416
(ret == 0) ? "successfully" : "with error");
2211
2423
}
2212
2424
2213
2425
/* Cleanup things */
2426
free(mc.interfaces);
2427
2214
2428
if(sb != NULL)
2215
2429
avahi_s_service_browser_free(sb);
2216
2430
2217
2431
if(mc.server != NULL)
2218
2432
avahi_server_free(mc.server);
2219
2433
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2222
2436
2223
2437
if(gnutls_initialized){
2224
2438
gnutls_certificate_free_credentials(mc.cred);
2241
2455
}
2242
2456
}
2243
2457
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
2458
/* Re-raise priviliges */
2248
2459
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2253
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2265
2476
}
2266
2477
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2270
2481
}
2271
2482
}
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2483
2484
lower_privileges_permanently();
2485
}
2486
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2279
2489
2280
2490
/* Removes the GPGME temp directory and all files inside */
2281
2491
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0