To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 395
- compare with another revision
- download diff
- download tarball
- view history from revision 395
- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
88
86
89
87
#ifdef __linux__
90
88
#include <sys/klog.h> /* klogctl() */
128
126
static const char mandos_protocol_version[] = "1";
129
127
const char *argp_program_version = "mandos-client " VERSION;
130
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
144
129
145
130
/* Used for passing in values through the Avahi callback functions */
146
131
typedef struct {
151
136
gnutls_dh_params_t dh_params;
152
137
const char *priority;
153
138
gpgme_ctx_t ctx;
154
server *current_server;
155
139
} mandos_context;
156
140
157
141
/* global context so signal handler can reach it*/
158
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
143
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
162
145
163
146
sig_atomic_t quit_now = 0;
164
147
int signal_received = 0;
165
148
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
149
/*
174
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
151
* bytes. "buffer_capacity" is how much is currently allocated,
187
163
return buffer_capacity;
188
164
}
189
165
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
227
166
/*
228
167
* Initialize GPGME.
229
168
*/
243
182
244
183
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
184
if(fd == -1){
246
perror_plus("open");
185
perror("open");
247
186
return false;
248
187
}
249
188
263
202
264
203
ret = (int)TEMP_FAILURE_RETRY(close(fd));
265
204
if(ret == -1){
266
perror_plus("close");
205
perror("close");
267
206
}
268
207
gpgme_data_release(pgp_data);
269
208
return true;
394
333
395
334
/* Seek back to the beginning of the GPGME plaintext data buffer */
396
335
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
336
perror("gpgme_data_seek");
398
337
plaintext_length = -1;
399
338
goto decrypt_end;
400
339
}
405
344
(size_t)plaintext_length,
406
345
plaintext_capacity);
407
346
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
347
perror("incbuffer");
409
348
plaintext_length = -1;
410
349
goto decrypt_end;
411
350
}
418
357
break;
419
358
}
420
359
if(ret < 0){
421
perror_plus("gpgme_data_read");
360
perror("gpgme_data_read");
422
361
plaintext_length = -1;
423
362
goto decrypt_end;
424
363
}
481
420
}
482
421
483
422
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
423
gnutls_certificate_allocate_credentials(&mc.cred);
485
424
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
487
429
safer_gnutls_strerror(ret));
488
430
gnutls_global_deinit();
489
431
return -1;
611
553
gnutls_session_t session;
612
554
int pf; /* Protocol family */
613
555
614
errno = 0;
615
616
556
if(quit_now){
617
errno = EINTR;
618
557
return -1;
619
558
}
620
559
627
566
break;
628
567
default:
629
568
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
569
return -1;
632
570
}
633
571
643
581
644
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
583
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
584
perror("socket");
649
585
goto mandos_end;
650
586
}
651
587
652
588
if(quit_now){
653
errno = EINTR;
654
589
goto mandos_end;
655
590
}
656
591
663
598
ret = inet_pton(af, ip, &to.in.sin_addr);
664
599
}
665
600
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
601
perror("inet_pton");
669
602
goto mandos_end;
670
603
}
671
604
if(ret == 0){
672
int e = errno;
673
605
fprintf(stderr, "Bad address: %s\n", ip);
674
errno = e;
675
606
goto mandos_end;
676
607
}
677
608
if(af == AF_INET6){
685
616
if(if_index == AVAHI_IF_UNSPEC){
686
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
618
" without a network interface\n");
688
errno = EINVAL;
689
619
goto mandos_end;
690
620
}
691
621
/* Set the network interface number as scope */
698
628
}
699
629
700
630
if(quit_now){
701
errno = EINTR;
702
631
goto mandos_end;
703
632
}
704
633
706
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
636
char interface[IF_NAMESIZE];
708
637
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
638
perror("if_indextoname");
710
639
} else {
711
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
641
ip, interface, port);
726
655
sizeof(addrstr));
727
656
}
728
657
if(pcret == NULL){
729
perror_plus("inet_ntop");
658
perror("inet_ntop");
730
659
} else {
731
660
if(strcmp(addrstr, ip) != 0){
732
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
664
}
736
665
737
666
if(quit_now){
738
errno = EINTR;
739
667
goto mandos_end;
740
668
}
741
669
745
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
674
}
747
675
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
676
perror("connect");
753
677
goto mandos_end;
754
678
}
755
679
756
680
if(quit_now){
757
errno = EINTR;
758
681
goto mandos_end;
759
682
}
760
683
765
688
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
689
out_size - written));
767
690
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
691
perror("write");
771
692
goto mandos_end;
772
693
}
773
694
written += (size_t)ret;
783
704
}
784
705
785
706
if(quit_now){
786
errno = EINTR;
787
707
goto mandos_end;
788
708
}
789
709
}
793
713
}
794
714
795
715
if(quit_now){
796
errno = EINTR;
797
716
goto mandos_end;
798
717
}
799
718
800
/* Spurious warning from -Wint-to-pointer-cast */
801
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
720
803
721
if(quit_now){
804
errno = EINTR;
805
722
goto mandos_end;
806
723
}
807
724
808
725
do {
809
726
ret = gnutls_handshake(session);
810
727
if(quit_now){
811
errno = EINTR;
812
728
goto mandos_end;
813
729
}
814
730
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
818
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
735
gnutls_perror(ret);
820
736
}
821
errno = EPROTO;
822
737
goto mandos_end;
823
738
}
824
739
832
747
while(true){
833
748
834
749
if(quit_now){
835
errno = EINTR;
836
750
goto mandos_end;
837
751
}
838
752
839
753
buffer_capacity = incbuffer(&buffer, buffer_length,
840
754
buffer_capacity);
841
755
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
756
perror("incbuffer");
845
757
goto mandos_end;
846
758
}
847
759
848
760
if(quit_now){
849
errno = EINTR;
850
761
goto mandos_end;
851
762
}
852
763
865
776
ret = gnutls_handshake(session);
866
777
867
778
if(quit_now){
868
errno = EINTR;
869
779
goto mandos_end;
870
780
}
871
781
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
782
if(ret < 0){
873
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
784
gnutls_perror(ret);
875
errno = EPROTO;
876
785
goto mandos_end;
877
786
}
878
787
break;
880
789
fprintf(stderr, "Unknown error while reading data from"
881
790
" encrypted session with Mandos server\n");
882
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
884
792
goto mandos_end;
885
793
}
886
794
} else {
893
801
}
894
802
895
803
if(quit_now){
896
errno = EINTR;
897
804
goto mandos_end;
898
805
}
899
806
900
807
do {
901
808
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
809
if(quit_now){
903
errno = EINTR;
904
810
goto mandos_end;
905
811
}
906
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
915
821
written = 0;
916
822
while(written < (size_t) decrypted_buffer_size){
917
823
if(quit_now){
918
errno = EINTR;
919
824
goto mandos_end;
920
825
}
921
826
923
828
(size_t)decrypted_buffer_size - written,
924
829
stdout);
925
830
if(ret == 0 and ferror(stdout)){
926
int e = errno;
927
831
if(debug){
928
832
fprintf(stderr, "Error writing encrypted data: %s\n",
929
833
strerror(errno));
930
834
}
931
errno = e;
932
835
goto mandos_end;
933
836
}
934
837
written += (size_t)ret;
940
843
/* Shutdown procedure */
941
844
942
845
mandos_end:
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
846
free(decrypted_buffer);
847
free(buffer);
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
962
857
}
963
858
return retval;
964
859
}
1007
902
avahi_proto_to_af(proto));
1008
903
if(ret == 0){
1009
904
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1013
905
}
1014
906
}
1015
907
}
1069
961
}
1070
962
}
1071
963
1072
/* Signal handler that stops main loop after SIGTERM */
964
/* stop main loop after sigterm has been called */
1073
965
static void handle_sigterm(int sig){
1074
966
if(quit_now){
1075
967
return;
1077
969
quit_now = 1;
1078
970
signal_received = sig;
1079
971
int old_errno = errno;
1080
/* set main loop to exit */
1081
972
if(mc.simple_poll != NULL){
1082
973
avahi_simple_poll_quit(mc.simple_poll);
1083
974
}
1084
975
errno = old_errno;
1085
976
}
1086
977
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
1274
978
int main(int argc, char *argv[]){
1275
979
AvahiSServiceBrowser *sb = NULL;
1276
980
int error;
1278
982
intmax_t tmpmax;
1279
983
char *tmp;
1280
984
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
985
const char *interface = "eth0";
1282
986
struct ifreq network;
1283
987
int sd = -1;
1284
988
bool take_down_interface = false;
1285
989
uid_t uid;
1286
990
gid_t gid;
991
char *connect_to = NULL;
1287
992
char tempdir[] = "/tmp/mandosXXXXXX";
1288
993
bool tempdir_created = false;
1289
994
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1293
998
bool gnutls_initialized = false;
1294
999
bool gpgme_initialized = false;
1295
1000
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1298
1001
1299
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1306
1009
errno = 0;
1307
1010
ret = setgid(gid);
1308
1011
if(ret == -1){
1309
perror_plus("setgid");
1012
perror("setgid");
1310
1013
}
1311
1014
1312
1015
/* Lower user privileges (temporarily) */
1313
1016
errno = 0;
1314
1017
ret = seteuid(uid);
1315
1018
if(ret == -1){
1316
perror_plus("seteuid");
1019
perror("seteuid");
1317
1020
}
1318
1021
1319
1022
if(quit_now){
1354
1057
.arg = "SECONDS",
1355
1058
.doc = "Maximum delay to wait for interface startup",
1356
1059
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
1060
/*
1362
1061
* These reproduce what we would get without ARGP_NO_HELP
1363
1062
*/
1407
1106
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
1107
argp_error(state, "Bad delay");
1409
1108
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1416
}
1417
1109
break;
1418
1110
/*
1419
1111
* These reproduce what we would get without ARGP_NO_HELP
1447
1139
case ENOMEM:
1448
1140
default:
1449
1141
errno = ret;
1450
perror_plus("argp_parse");
1142
perror("argp_parse");
1451
1143
exitcode = EX_OSERR;
1452
1144
goto end;
1453
1145
case EINVAL:
1455
1147
goto end;
1456
1148
}
1457
1149
}
1458
1459
{
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
1513
}
1514
1150
1515
1151
if(not debug){
1516
1152
avahi_set_log_function(empty_log);
1517
1153
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
1154
1544
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
1156
from the signal handler */
1548
1159
mc.simple_poll = avahi_simple_poll_new();
1549
1160
if(mc.simple_poll == NULL){
1550
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1551
exitcode = EX_UNAVAILABLE;
1162
exitcode = EXIT_FAILURE;
1552
1163
goto end;
1553
1164
}
1554
1165
1555
1166
sigemptyset(&sigterm_action.sa_mask);
1556
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1557
1168
if(ret == -1){
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1560
1171
goto end;
1561
1172
}
1562
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1563
1174
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1566
1177
goto end;
1567
1178
}
1568
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1569
1180
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1572
1183
goto end;
1573
1184
}
1574
1185
/* Need to check if the handler is SIG_IGN before handling:
1577
1188
*/
1578
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1579
1190
if(ret == -1){
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1582
1193
}
1583
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1585
1196
if(ret == -1){
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1588
1199
goto end;
1589
1200
}
1590
1201
}
1591
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1592
1203
if(ret == -1){
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1595
1206
}
1596
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1598
1209
if(ret == -1){
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1601
1212
goto end;
1602
1213
}
1603
1214
}
1604
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1605
1216
if(ret == -1){
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1608
1219
}
1609
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1611
1222
if(ret == -1){
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1614
1225
goto end;
1615
1226
}
1616
1227
}
1617
1228
1618
1229
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1230
if(interface[0] != '\0'){
1620
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
1232
if(if_index == 0){
1622
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1234
exitcode = EXIT_FAILURE;
1624
1235
goto end;
1625
1236
}
1626
1237
1632
1243
errno = 0;
1633
1244
ret = seteuid(0);
1634
1245
if(ret == -1){
1635
perror_plus("seteuid");
1246
perror("seteuid");
1636
1247
}
1637
1248
1638
1249
#ifdef __linux__
1642
1253
bool restore_loglevel = true;
1643
1254
if(ret == -1){
1644
1255
restore_loglevel = false;
1645
perror_plus("klogctl");
1256
perror("klogctl");
1646
1257
}
1647
1258
#endif /* __linux__ */
1648
1259
1649
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
1261
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1653
1264
#ifdef __linux__
1654
1265
if(restore_loglevel){
1655
1266
ret = klogctl(7, NULL, 0);
1656
1267
if(ret == -1){
1657
perror_plus("klogctl");
1268
perror("klogctl");
1658
1269
}
1659
1270
}
1660
1271
#endif /* __linux__ */
1662
1273
errno = 0;
1663
1274
ret = seteuid(uid);
1664
1275
if(ret == -1){
1665
perror_plus("seteuid");
1276
perror("seteuid");
1666
1277
}
1667
1278
goto end;
1668
1279
}
1669
1280
strcpy(network.ifr_name, interface);
1670
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
1282
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1283
perror("ioctl SIOCGIFFLAGS");
1673
1284
#ifdef __linux__
1674
1285
if(restore_loglevel){
1675
1286
ret = klogctl(7, NULL, 0);
1676
1287
if(ret == -1){
1677
perror_plus("klogctl");
1288
perror("klogctl");
1678
1289
}
1679
1290
}
1680
1291
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1292
exitcode = EXIT_FAILURE;
1682
1293
/* Lower privileges */
1683
1294
errno = 0;
1684
1295
ret = seteuid(uid);
1685
1296
if(ret == -1){
1686
perror_plus("seteuid");
1297
perror("seteuid");
1687
1298
}
1688
1299
goto end;
1689
1300
}
1693
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
1305
if(ret == -1){
1695
1306
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1698
1309
#ifdef __linux__
1699
1310
if(restore_loglevel){
1700
1311
ret = klogctl(7, NULL, 0);
1701
1312
if(ret == -1){
1702
perror_plus("klogctl");
1313
perror("klogctl");
1703
1314
}
1704
1315
}
1705
1316
#endif /* __linux__ */
1707
1318
errno = 0;
1708
1319
ret = seteuid(uid);
1709
1320
if(ret == -1){
1710
perror_plus("seteuid");
1321
perror("seteuid");
1711
1322
}
1712
1323
goto end;
1713
1324
}
1714
1325
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1326
/* sleep checking until interface is running */
1717
1327
for(int i=0; i < delay * 4; i++){
1718
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
1329
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1330
perror("ioctl SIOCGIFFLAGS");
1721
1331
} else if(network.ifr_flags & IFF_RUNNING){
1722
1332
break;
1723
1333
}
1724
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
1335
ret = nanosleep(&sleeptime, NULL);
1726
1336
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1337
perror("nanosleep");
1728
1338
}
1729
1339
}
1730
1340
if(not take_down_interface){
1731
1341
/* We won't need the socket anymore */
1732
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
1343
if(ret == -1){
1734
perror_plus("close");
1344
perror("close");
1735
1345
}
1736
1346
}
1737
1347
#ifdef __linux__
1739
1349
/* Restores kernel loglevel to default */
1740
1350
ret = klogctl(7, NULL, 0);
1741
1351
if(ret == -1){
1742
perror_plus("klogctl");
1352
perror("klogctl");
1743
1353
}
1744
1354
}
1745
1355
#endif /* __linux__ */
1749
1359
/* Lower privileges */
1750
1360
ret = seteuid(uid);
1751
1361
if(ret == -1){
1752
perror_plus("seteuid");
1362
perror("seteuid");
1753
1363
}
1754
1364
} else {
1755
1365
/* Lower privileges permanently */
1756
1366
ret = setuid(uid);
1757
1367
if(ret == -1){
1758
perror_plus("setuid");
1368
perror("setuid");
1759
1369
}
1760
1370
}
1761
1371
}
1767
1377
ret = init_gnutls_global(pubkey, seckey);
1768
1378
if(ret == -1){
1769
1379
fprintf(stderr, "init_gnutls_global failed\n");
1770
exitcode = EX_UNAVAILABLE;
1380
exitcode = EXIT_FAILURE;
1771
1381
goto end;
1772
1382
} else {
1773
1383
gnutls_initialized = true;
1777
1387
goto end;
1778
1388
}
1779
1389
1390
tempdir_created = true;
1780
1391
if(mkdtemp(tempdir) == NULL){
1781
perror_plus("mkdtemp");
1392
tempdir_created = false;
1393
perror("mkdtemp");
1782
1394
goto end;
1783
1395
}
1784
tempdir_created = true;
1785
1396
1786
1397
if(quit_now){
1787
1398
goto end;
1789
1400
1790
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
1402
fprintf(stderr, "init_gpgme failed\n");
1792
exitcode = EX_UNAVAILABLE;
1403
exitcode = EXIT_FAILURE;
1793
1404
goto end;
1794
1405
} else {
1795
1406
gpgme_initialized = true;
1805
1416
char *address = strrchr(connect_to, ':');
1806
1417
if(address == NULL){
1807
1418
fprintf(stderr, "No colon in address\n");
1808
exitcode = EX_USAGE;
1419
exitcode = EXIT_FAILURE;
1809
1420
goto end;
1810
1421
}
1811
1422
1819
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
1431
or tmpmax != (uint16_t)tmpmax){
1821
1432
fprintf(stderr, "Bad port number\n");
1822
exitcode = EX_USAGE;
1433
exitcode = EXIT_FAILURE;
1823
1434
goto end;
1824
1435
}
1825
1436
1841
1452
if(quit_now){
1842
1453
goto end;
1843
1454
}
1844
1845
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
1847
if(quit_now or ret == 0){
1848
break;
1849
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
1854
1460
exitcode = EXIT_SUCCESS;
1855
1461
}
1856
1857
1462
goto end;
1858
1463
}
1859
1464
1883
1488
if(mc.server == NULL){
1884
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
1490
avahi_strerror(error));
1886
exitcode = EX_UNAVAILABLE;
1491
exitcode = EXIT_FAILURE;
1887
1492
goto end;
1888
1493
}
1889
1494
1898
1503
if(sb == NULL){
1899
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1900
1505
avahi_strerror(avahi_server_errno(mc.server)));
1901
exitcode = EX_UNAVAILABLE;
1506
exitcode = EXIT_FAILURE;
1902
1507
goto end;
1903
1508
}
1904
1509
1911
1516
if(debug){
1912
1517
fprintf(stderr, "Starting Avahi loop search\n");
1913
1518
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1917
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1920
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
1921
1521
1922
1522
end:
1923
1523
1944
1544
if(gpgme_initialized){
1945
1545
gpgme_release(mc.ctx);
1946
1546
}
1947
1948
/* Cleans up the circular linked list of Mandos servers the client
1949
has seen */
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1956
}
1957
}
1958
1547
1959
1548
/* Take down the network interface */
1960
1549
if(take_down_interface){
1962
1551
errno = 0;
1963
1552
ret = seteuid(0);
1964
1553
if(ret == -1){
1965
perror_plus("seteuid");
1554
perror("seteuid");
1966
1555
}
1967
1556
if(geteuid() == 0){
1968
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
1558
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1559
perror("ioctl SIOCGIFFLAGS");
1971
1560
} else if(network.ifr_flags & IFF_UP) {
1972
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
1563
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1564
perror("ioctl SIOCSIFFLAGS");
1976
1565
}
1977
1566
}
1978
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
1568
if(ret == -1){
1980
perror_plus("close");
1569
perror("close");
1981
1570
}
1982
1571
/* Lower privileges permanently */
1983
1572
errno = 0;
1984
1573
ret = setuid(uid);
1985
1574
if(ret == -1){
1986
perror_plus("setuid");
1575
perror("setuid");
1987
1576
}
1988
1577
}
1989
1578
}
1990
1579
1991
/* Removes the GPGME temp directory and all files inside */
1580
/* Removes the temp directory used by GPGME */
1992
1581
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
1999
1602
char *fullname = NULL;
2000
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
1604
direntry->d_name);
2002
1605
if(ret < 0){
2003
perror_plus("asprintf");
1606
perror("asprintf");
2004
1607
continue;
2005
1608
}
2006
1609
ret = remove(fullname);
2010
1613
}
2011
1614
free(fullname);
2012
1615
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
1616
closedir(d);
2020
1617
}
2021
1618
ret = rmdir(tempdir);
2022
1619
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
1620
perror("rmdir");
2024
1621
}
2025
1622
}
2026
1623
2031
1628
&old_sigterm_action,
2032
1629
NULL));
2033
1630
if(ret == -1){
2034
perror_plus("sigaction");
1631
perror("sigaction");
2035
1632
}
2036
1633
do {
2037
1634
ret = raise(signal_received);
2038
1635
} while(ret != 0 and errno == EINTR);
2039
1636
if(ret != 0){
2040
perror_plus("raise");
1637
perror("raise");
2041
1638
abort();
2042
1639
}
2043
1640
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0