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- Committer: Teddy Hogeborn
- Date: 2011-07-25 18:50:00 UTC
- mfrom: (24.1.176 mandos)
- Revision ID: teddy@fukt.bsnet.se-20110725185000-paes3keuo0dj4m0z
Merge from Björn.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
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, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
86
88
87
89
#ifdef __linux__
88
90
#include <sys/klog.h> /* klogctl() */
126
128
static const char mandos_protocol_version[] = "1";
127
129
const char *argp_program_version = "mandos-client " VERSION;
128
130
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;
129
144
130
145
/* Used for passing in values through the Avahi callback functions */
131
146
typedef struct {
136
151
gnutls_dh_params_t dh_params;
137
152
const char *priority;
138
153
gpgme_ctx_t ctx;
154
server *current_server;
139
155
} mandos_context;
140
156
141
157
/* global context so signal handler can reach it*/
142
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
159
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
145
162
146
163
sig_atomic_t quit_now = 0;
147
164
int signal_received = 0;
148
165
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
149
173
/*
150
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
175
* bytes. "buffer_capacity" is how much is currently allocated,
163
187
return buffer_capacity;
164
188
}
165
189
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
166
227
/*
167
228
* Initialize GPGME.
168
229
*/
182
243
183
244
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
245
if(fd == -1){
185
perror("open");
246
perror_plus("open");
186
247
return false;
187
248
}
188
249
202
263
203
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
265
if(ret == -1){
205
perror("close");
266
perror_plus("close");
206
267
}
207
268
gpgme_data_release(pgp_data);
208
269
return true;
333
394
334
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
396
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
397
perror_plus("gpgme_data_seek");
337
398
plaintext_length = -1;
338
399
goto decrypt_end;
339
400
}
344
405
(size_t)plaintext_length,
345
406
plaintext_capacity);
346
407
if(plaintext_capacity == 0){
347
perror("incbuffer");
408
perror_plus("incbuffer");
348
409
plaintext_length = -1;
349
410
goto decrypt_end;
350
411
}
357
418
break;
358
419
}
359
420
if(ret < 0){
360
perror("gpgme_data_read");
421
perror_plus("gpgme_data_read");
361
422
plaintext_length = -1;
362
423
goto decrypt_end;
363
424
}
420
481
}
421
482
422
483
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
485
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
486
fprintf(stderr, "GnuTLS memory error: %s\n",
429
487
safer_gnutls_strerror(ret));
430
488
gnutls_global_deinit();
431
489
return -1;
553
611
gnutls_session_t session;
554
612
int pf; /* Protocol family */
555
613
614
errno = 0;
615
556
616
if(quit_now){
617
errno = EINTR;
557
618
return -1;
558
619
}
559
620
566
627
break;
567
628
default:
568
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
569
631
return -1;
570
632
}
571
633
581
643
582
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
645
if(tcp_sd < 0){
584
perror("socket");
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
585
649
goto mandos_end;
586
650
}
587
651
588
652
if(quit_now){
653
errno = EINTR;
589
654
goto mandos_end;
590
655
}
591
656
598
663
ret = inet_pton(af, ip, &to.in.sin_addr);
599
664
}
600
665
if(ret < 0 ){
601
perror("inet_pton");
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
602
669
goto mandos_end;
603
670
}
604
671
if(ret == 0){
672
int e = errno;
605
673
fprintf(stderr, "Bad address: %s\n", ip);
674
errno = e;
606
675
goto mandos_end;
607
676
}
608
677
if(af == AF_INET6){
616
685
if(if_index == AVAHI_IF_UNSPEC){
617
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
687
" without a network interface\n");
688
errno = EINVAL;
619
689
goto mandos_end;
620
690
}
621
691
/* Set the network interface number as scope */
628
698
}
629
699
630
700
if(quit_now){
701
errno = EINTR;
631
702
goto mandos_end;
632
703
}
633
704
635
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
707
char interface[IF_NAMESIZE];
637
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
709
perror_plus("if_indextoname");
639
710
} else {
640
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
712
ip, interface, port);
655
726
sizeof(addrstr));
656
727
}
657
728
if(pcret == NULL){
658
perror("inet_ntop");
729
perror_plus("inet_ntop");
659
730
} else {
660
731
if(strcmp(addrstr, ip) != 0){
661
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
664
735
}
665
736
666
737
if(quit_now){
738
errno = EINTR;
667
739
goto mandos_end;
668
740
}
669
741
673
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
746
}
675
747
if(ret < 0){
676
perror("connect");
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
677
753
goto mandos_end;
678
754
}
679
755
680
756
if(quit_now){
757
errno = EINTR;
681
758
goto mandos_end;
682
759
}
683
760
688
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
766
out_size - written));
690
767
if(ret == -1){
691
perror("write");
768
int e = errno;
769
perror_plus("write");
770
errno = e;
692
771
goto mandos_end;
693
772
}
694
773
written += (size_t)ret;
704
783
}
705
784
706
785
if(quit_now){
786
errno = EINTR;
707
787
goto mandos_end;
708
788
}
709
789
}
713
793
}
714
794
715
795
if(quit_now){
796
errno = EINTR;
716
797
goto mandos_end;
717
798
}
718
799
800
/* Spurious warning from -Wint-to-pointer-cast */
719
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
802
721
803
if(quit_now){
804
errno = EINTR;
722
805
goto mandos_end;
723
806
}
724
807
725
808
do {
726
809
ret = gnutls_handshake(session);
727
810
if(quit_now){
811
errno = EINTR;
728
812
goto mandos_end;
729
813
}
730
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
735
819
gnutls_perror(ret);
736
820
}
821
errno = EPROTO;
737
822
goto mandos_end;
738
823
}
739
824
747
832
while(true){
748
833
749
834
if(quit_now){
835
errno = EINTR;
750
836
goto mandos_end;
751
837
}
752
838
753
839
buffer_capacity = incbuffer(&buffer, buffer_length,
754
840
buffer_capacity);
755
841
if(buffer_capacity == 0){
756
perror("incbuffer");
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
757
845
goto mandos_end;
758
846
}
759
847
760
848
if(quit_now){
849
errno = EINTR;
761
850
goto mandos_end;
762
851
}
763
852
776
865
ret = gnutls_handshake(session);
777
866
778
867
if(quit_now){
868
errno = EINTR;
779
869
goto mandos_end;
780
870
}
781
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
872
if(ret < 0){
783
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
784
874
gnutls_perror(ret);
875
errno = EPROTO;
785
876
goto mandos_end;
786
877
}
787
878
break;
789
880
fprintf(stderr, "Unknown error while reading data from"
790
881
" encrypted session with Mandos server\n");
791
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
792
884
goto mandos_end;
793
885
}
794
886
} else {
801
893
}
802
894
803
895
if(quit_now){
896
errno = EINTR;
804
897
goto mandos_end;
805
898
}
806
899
807
900
do {
808
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
902
if(quit_now){
903
errno = EINTR;
810
904
goto mandos_end;
811
905
}
812
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
821
915
written = 0;
822
916
while(written < (size_t) decrypted_buffer_size){
823
917
if(quit_now){
918
errno = EINTR;
824
919
goto mandos_end;
825
920
}
826
921
828
923
(size_t)decrypted_buffer_size - written,
829
924
stdout);
830
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
831
927
if(debug){
832
928
fprintf(stderr, "Error writing encrypted data: %s\n",
833
929
strerror(errno));
834
930
}
931
errno = e;
835
932
goto mandos_end;
836
933
}
837
934
written += (size_t)ret;
843
940
/* Shutdown procedure */
844
941
845
942
mandos_end:
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;
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
}
857
962
}
858
963
return retval;
859
964
}
902
1007
avahi_proto_to_af(proto));
903
1008
if(ret == 0){
904
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
905
1013
}
906
1014
}
907
1015
}
961
1069
}
962
1070
}
963
1071
964
/* stop main loop after sigterm has been called */
1072
/* Signal handler that stops main loop after SIGTERM */
965
1073
static void handle_sigterm(int sig){
966
1074
if(quit_now){
967
1075
return;
969
1077
quit_now = 1;
970
1078
signal_received = sig;
971
1079
int old_errno = errno;
1080
/* set main loop to exit */
972
1081
if(mc.simple_poll != NULL){
973
1082
avahi_simple_poll_quit(mc.simple_poll);
974
1083
}
975
1084
errno = old_errno;
976
1085
}
977
1086
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
978
1274
int main(int argc, char *argv[]){
979
1275
AvahiSServiceBrowser *sb = NULL;
980
1276
int error;
982
1278
intmax_t tmpmax;
983
1279
char *tmp;
984
1280
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1281
const char *interface = "";
986
1282
struct ifreq network;
987
1283
int sd = -1;
988
1284
bool take_down_interface = false;
989
1285
uid_t uid;
990
1286
gid_t gid;
991
char *connect_to = NULL;
992
1287
char tempdir[] = "/tmp/mandosXXXXXX";
993
1288
bool tempdir_created = false;
994
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
998
1293
bool gnutls_initialized = false;
999
1294
bool gpgme_initialized = false;
1000
1295
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1001
1298
1002
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1306
errno = 0;
1010
1307
ret = setgid(gid);
1011
1308
if(ret == -1){
1012
perror("setgid");
1309
perror_plus("setgid");
1013
1310
}
1014
1311
1015
1312
/* Lower user privileges (temporarily) */
1016
1313
errno = 0;
1017
1314
ret = seteuid(uid);
1018
1315
if(ret == -1){
1019
perror("seteuid");
1316
perror_plus("seteuid");
1020
1317
}
1021
1318
1022
1319
if(quit_now){
1057
1354
.arg = "SECONDS",
1058
1355
.doc = "Maximum delay to wait for interface startup",
1059
1356
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1060
1361
/*
1061
1362
* These reproduce what we would get without ARGP_NO_HELP
1062
1363
*/
1106
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1408
argp_error(state, "Bad delay");
1108
1409
}
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
}
1109
1417
break;
1110
1418
/*
1111
1419
* These reproduce what we would get without ARGP_NO_HELP
1139
1447
case ENOMEM:
1140
1448
default:
1141
1449
errno = ret;
1142
perror("argp_parse");
1450
perror_plus("argp_parse");
1143
1451
exitcode = EX_OSERR;
1144
1452
goto end;
1145
1453
case EINVAL:
1147
1455
goto end;
1148
1456
}
1149
1457
}
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
}
1150
1514
1151
1515
if(not debug){
1152
1516
avahi_set_log_function(empty_log);
1153
1517
}
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
}
1154
1543
1155
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1545
from the signal handler */
1159
1548
mc.simple_poll = avahi_simple_poll_new();
1160
1549
if(mc.simple_poll == NULL){
1161
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1551
exitcode = EX_UNAVAILABLE;
1163
1552
goto end;
1164
1553
}
1165
1554
1166
1555
sigemptyset(&sigterm_action.sa_mask);
1167
1556
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
1557
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1171
1560
goto end;
1172
1561
}
1173
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
1563
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1177
1566
goto end;
1178
1567
}
1179
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
1569
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1183
1572
goto end;
1184
1573
}
1185
1574
/* Need to check if the handler is SIG_IGN before handling:
1188
1577
*/
1189
1578
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
1579
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1193
1582
}
1194
1583
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1584
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
1585
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1199
1588
goto end;
1200
1589
}
1201
1590
}
1202
1591
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
1592
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1206
1595
}
1207
1596
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1597
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
1598
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1212
1601
goto end;
1213
1602
}
1214
1603
}
1215
1604
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
1605
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1219
1608
}
1220
1609
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1610
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
1611
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1225
1614
goto end;
1226
1615
}
1227
1616
}
1228
1617
1229
1618
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1619
if(strcmp(interface, "none") != 0){
1231
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1621
if(if_index == 0){
1233
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1623
exitcode = EX_UNAVAILABLE;
1235
1624
goto end;
1236
1625
}
1237
1626
1243
1632
errno = 0;
1244
1633
ret = seteuid(0);
1245
1634
if(ret == -1){
1246
perror("seteuid");
1635
perror_plus("seteuid");
1247
1636
}
1248
1637
1249
1638
#ifdef __linux__
1253
1642
bool restore_loglevel = true;
1254
1643
if(ret == -1){
1255
1644
restore_loglevel = false;
1256
perror("klogctl");
1645
perror_plus("klogctl");
1257
1646
}
1258
1647
#endif /* __linux__ */
1259
1648
1260
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
1650
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1264
1653
#ifdef __linux__
1265
1654
if(restore_loglevel){
1266
1655
ret = klogctl(7, NULL, 0);
1267
1656
if(ret == -1){
1268
perror("klogctl");
1657
perror_plus("klogctl");
1269
1658
}
1270
1659
}
1271
1660
#endif /* __linux__ */
1273
1662
errno = 0;
1274
1663
ret = seteuid(uid);
1275
1664
if(ret == -1){
1276
perror("seteuid");
1665
perror_plus("seteuid");
1277
1666
}
1278
1667
goto end;
1279
1668
}
1280
1669
strcpy(network.ifr_name, interface);
1281
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
1671
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1672
perror_plus("ioctl SIOCGIFFLAGS");
1284
1673
#ifdef __linux__
1285
1674
if(restore_loglevel){
1286
1675
ret = klogctl(7, NULL, 0);
1287
1676
if(ret == -1){
1288
perror("klogctl");
1677
perror_plus("klogctl");
1289
1678
}
1290
1679
}
1291
1680
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1681
exitcode = EX_OSERR;
1293
1682
/* Lower privileges */
1294
1683
errno = 0;
1295
1684
ret = seteuid(uid);
1296
1685
if(ret == -1){
1297
perror("seteuid");
1686
perror_plus("seteuid");
1298
1687
}
1299
1688
goto end;
1300
1689
}
1304
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
1694
if(ret == -1){
1306
1695
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1309
1698
#ifdef __linux__
1310
1699
if(restore_loglevel){
1311
1700
ret = klogctl(7, NULL, 0);
1312
1701
if(ret == -1){
1313
perror("klogctl");
1702
perror_plus("klogctl");
1314
1703
}
1315
1704
}
1316
1705
#endif /* __linux__ */
1318
1707
errno = 0;
1319
1708
ret = seteuid(uid);
1320
1709
if(ret == -1){
1321
perror("seteuid");
1710
perror_plus("seteuid");
1322
1711
}
1323
1712
goto end;
1324
1713
}
1325
1714
}
1326
/* sleep checking until interface is running */
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1327
1717
for(int i=0; i < delay * 4; i++){
1328
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
1719
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1720
perror_plus("ioctl SIOCGIFFLAGS");
1331
1721
} else if(network.ifr_flags & IFF_RUNNING){
1332
1722
break;
1333
1723
}
1334
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
1725
ret = nanosleep(&sleeptime, NULL);
1336
1726
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1727
perror_plus("nanosleep");
1338
1728
}
1339
1729
}
1340
1730
if(not take_down_interface){
1341
1731
/* We won't need the socket anymore */
1342
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
1733
if(ret == -1){
1344
perror("close");
1734
perror_plus("close");
1345
1735
}
1346
1736
}
1347
1737
#ifdef __linux__
1349
1739
/* Restores kernel loglevel to default */
1350
1740
ret = klogctl(7, NULL, 0);
1351
1741
if(ret == -1){
1352
perror("klogctl");
1742
perror_plus("klogctl");
1353
1743
}
1354
1744
}
1355
1745
#endif /* __linux__ */
1359
1749
/* Lower privileges */
1360
1750
ret = seteuid(uid);
1361
1751
if(ret == -1){
1362
perror("seteuid");
1752
perror_plus("seteuid");
1363
1753
}
1364
1754
} else {
1365
1755
/* Lower privileges permanently */
1366
1756
ret = setuid(uid);
1367
1757
if(ret == -1){
1368
perror("setuid");
1758
perror_plus("setuid");
1369
1759
}
1370
1760
}
1371
1761
}
1377
1767
ret = init_gnutls_global(pubkey, seckey);
1378
1768
if(ret == -1){
1379
1769
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
1770
exitcode = EX_UNAVAILABLE;
1381
1771
goto end;
1382
1772
} else {
1383
1773
gnutls_initialized = true;
1387
1777
goto end;
1388
1778
}
1389
1779
1780
if(mkdtemp(tempdir) == NULL){
1781
perror_plus("mkdtemp");
1782
goto end;
1783
}
1390
1784
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
1785
1397
1786
if(quit_now){
1398
1787
goto end;
1400
1789
1401
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
1791
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
1792
exitcode = EX_UNAVAILABLE;
1404
1793
goto end;
1405
1794
} else {
1406
1795
gpgme_initialized = true;
1416
1805
char *address = strrchr(connect_to, ':');
1417
1806
if(address == NULL){
1418
1807
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
1808
exitcode = EX_USAGE;
1420
1809
goto end;
1421
1810
}
1422
1811
1430
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
1820
or tmpmax != (uint16_t)tmpmax){
1432
1821
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
1822
exitcode = EX_USAGE;
1434
1823
goto end;
1435
1824
}
1436
1825
1452
1841
if(quit_now){
1453
1842
goto end;
1454
1843
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
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){
1460
1854
exitcode = EXIT_SUCCESS;
1461
1855
}
1856
1462
1857
goto end;
1463
1858
}
1464
1859
1488
1883
if(mc.server == NULL){
1489
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
1885
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
1886
exitcode = EX_UNAVAILABLE;
1492
1887
goto end;
1493
1888
}
1494
1889
1503
1898
if(sb == NULL){
1504
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1505
1900
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
1901
exitcode = EX_UNAVAILABLE;
1507
1902
goto end;
1508
1903
}
1509
1904
1516
1911
if(debug){
1517
1912
fprintf(stderr, "Starting Avahi loop search\n");
1518
1913
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
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
}
1521
1921
1522
1922
end:
1523
1923
1544
1944
if(gpgme_initialized){
1545
1945
gpgme_release(mc.ctx);
1546
1946
}
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
}
1547
1958
1548
1959
/* Take down the network interface */
1549
1960
if(take_down_interface){
1551
1962
errno = 0;
1552
1963
ret = seteuid(0);
1553
1964
if(ret == -1){
1554
perror("seteuid");
1965
perror_plus("seteuid");
1555
1966
}
1556
1967
if(geteuid() == 0){
1557
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
1969
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1970
perror_plus("ioctl SIOCGIFFLAGS");
1560
1971
} else if(network.ifr_flags & IFF_UP) {
1561
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
1974
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1565
1976
}
1566
1977
}
1567
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
1979
if(ret == -1){
1569
perror("close");
1980
perror_plus("close");
1570
1981
}
1571
1982
/* Lower privileges permanently */
1572
1983
errno = 0;
1573
1984
ret = setuid(uid);
1574
1985
if(ret == -1){
1575
perror("setuid");
1986
perror_plus("setuid");
1576
1987
}
1577
1988
}
1578
1989
}
1579
1990
1580
/* Removes the temp directory used by GPGME */
1991
/* Removes the GPGME temp directory and all files inside */
1581
1992
if(tempdir_created){
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
}
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];
1602
1999
char *fullname = NULL;
1603
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2001
direntry->d_name);
1605
2002
if(ret < 0){
1606
perror("asprintf");
2003
perror_plus("asprintf");
1607
2004
continue;
1608
2005
}
1609
2006
ret = remove(fullname);
1613
2010
}
1614
2011
free(fullname);
1615
2012
}
1616
closedir(d);
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");
1617
2020
}
1618
2021
ret = rmdir(tempdir);
1619
2022
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2023
perror_plus("rmdir");
1621
2024
}
1622
2025
}
1623
2026
1628
2031
&old_sigterm_action,
1629
2032
NULL));
1630
2033
if(ret == -1){
1631
perror("sigaction");
2034
perror_plus("sigaction");
1632
2035
}
1633
2036
do {
1634
2037
ret = raise(signal_received);
1635
2038
} while(ret != 0 and errno == EINTR);
1636
2039
if(ret != 0){
1637
perror("raise");
2040
perror_plus("raise");
1638
2041
abort();
1639
2042
}
1640
2043
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0