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237.2.166
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-11-05 02:12:57 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091105021257-l2b5nb1v4pc2tupw
* mandos (ClientDBus.disable): Bug fix: complete rename of "log" and
"signal" to "quiet".
"signal" to "quiet".
- 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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,
127
126
bool debug = false;
128
127
static const char mandos_protocol_version[] = "1";
129
128
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@recompile.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
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
130
145
131
/* Used for passing in values through the Avahi callback functions */
146
132
typedef struct {
151
137
gnutls_dh_params_t dh_params;
152
138
const char *priority;
153
139
gpgme_ctx_t ctx;
154
server *current_server;
155
140
} mandos_context;
156
141
157
142
/* global context so signal handler can reach it*/
158
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
144
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
162
146
163
147
sig_atomic_t quit_now = 0;
164
148
int signal_received = 0;
165
149
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
150
/*
174
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
152
* bytes. "buffer_capacity" is how much is currently allocated,
187
164
return buffer_capacity;
188
165
}
189
166
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
167
/*
229
168
* Initialize GPGME.
230
169
*/
244
183
245
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
185
if(fd == -1){
247
perror_plus("open");
186
perror("open");
248
187
return false;
249
188
}
250
189
264
203
265
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
205
if(ret == -1){
267
perror_plus("close");
206
perror("close");
268
207
}
269
208
gpgme_data_release(pgp_data);
270
209
return true;
283
222
return false;
284
223
}
285
224
286
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
287
226
rc = gpgme_get_engine_info(&engine_info);
288
227
if(rc != GPG_ERR_NO_ERROR){
289
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
395
334
396
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
399
338
plaintext_length = -1;
400
339
goto decrypt_end;
401
340
}
406
345
(size_t)plaintext_length,
407
346
plaintext_capacity);
408
347
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
348
perror("incbuffer");
410
349
plaintext_length = -1;
411
350
goto decrypt_end;
412
351
}
419
358
break;
420
359
}
421
360
if(ret < 0){
422
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
423
362
plaintext_length = -1;
424
363
goto decrypt_end;
425
364
}
482
421
}
483
422
484
423
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
486
425
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
488
430
safer_gnutls_strerror(ret));
489
431
gnutls_global_deinit();
490
432
return -1;
645
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
588
if(tcp_sd < 0){
647
589
int e = errno;
648
perror_plus("socket");
590
perror("socket");
649
591
errno = e;
650
592
goto mandos_end;
651
593
}
665
607
}
666
608
if(ret < 0 ){
667
609
int e = errno;
668
perror_plus("inet_pton");
610
perror("inet_pton");
669
611
errno = e;
670
612
goto mandos_end;
671
613
}
707
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
650
char interface[IF_NAMESIZE];
709
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
652
perror("if_indextoname");
711
653
} else {
712
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
655
ip, interface, port);
727
669
sizeof(addrstr));
728
670
}
729
671
if(pcret == NULL){
730
perror_plus("inet_ntop");
672
perror("inet_ntop");
731
673
} else {
732
674
if(strcmp(addrstr, ip) != 0){
733
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
746
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
689
}
748
690
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
691
int e = errno;
692
perror("connect");
693
errno = e;
754
694
goto mandos_end;
755
695
}
756
696
767
707
out_size - written));
768
708
if(ret == -1){
769
709
int e = errno;
770
perror_plus("write");
710
perror("write");
771
711
errno = e;
772
712
goto mandos_end;
773
713
}
798
738
goto mandos_end;
799
739
}
800
740
801
/* Spurious warning from -Wint-to-pointer-cast */
802
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
742
804
743
if(quit_now){
841
780
buffer_capacity);
842
781
if(buffer_capacity == 0){
843
782
int e = errno;
844
perror_plus("incbuffer");
783
perror("incbuffer");
845
784
errno = e;
846
785
goto mandos_end;
847
786
}
952
891
if(e == 0){
953
892
e = errno;
954
893
}
955
perror_plus("close");
894
perror("close");
956
895
}
957
896
gnutls_deinit(session);
958
errno = e;
959
897
if(quit_now){
960
errno = EINTR;
898
e = EINTR;
961
899
retval = -1;
962
900
}
901
errno = e;
963
902
}
964
903
return retval;
965
904
}
1008
947
avahi_proto_to_af(proto));
1009
948
if(ret == 0){
1010
949
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1014
950
}
1015
951
}
1016
952
}
1070
1006
}
1071
1007
}
1072
1008
1073
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1074
1010
static void handle_sigterm(int sig){
1075
1011
if(quit_now){
1076
1012
return;
1078
1014
quit_now = 1;
1079
1015
signal_received = sig;
1080
1016
int old_errno = errno;
1081
/* set main loop to exit */
1082
1017
if(mc.simple_poll != NULL){
1083
1018
avahi_simple_poll_quit(mc.simple_poll);
1084
1019
}
1085
1020
errno = old_errno;
1086
1021
}
1087
1022
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1189
}
1190
return 1;
1191
}
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
1275
1023
int main(int argc, char *argv[]){
1276
1024
AvahiSServiceBrowser *sb = NULL;
1277
1025
int error;
1279
1027
intmax_t tmpmax;
1280
1028
char *tmp;
1281
1029
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1030
const char *interface = "eth0";
1283
1031
struct ifreq network;
1284
1032
int sd = -1;
1285
1033
bool take_down_interface = false;
1286
1034
uid_t uid;
1287
1035
gid_t gid;
1036
char *connect_to = NULL;
1288
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1038
bool tempdir_created = false;
1290
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1294
1043
bool gnutls_initialized = false;
1295
1044
bool gpgme_initialized = false;
1296
1045
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1046
1300
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1307
1054
errno = 0;
1308
1055
ret = setgid(gid);
1309
1056
if(ret == -1){
1310
perror_plus("setgid");
1057
perror("setgid");
1311
1058
}
1312
1059
1313
1060
/* Lower user privileges (temporarily) */
1314
1061
errno = 0;
1315
1062
ret = seteuid(uid);
1316
1063
if(ret == -1){
1317
perror_plus("seteuid");
1064
perror("seteuid");
1318
1065
}
1319
1066
1320
1067
if(quit_now){
1355
1102
.arg = "SECONDS",
1356
1103
.doc = "Maximum delay to wait for interface startup",
1357
1104
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
1105
/*
1363
1106
* These reproduce what we would get without ARGP_NO_HELP
1364
1107
*/
1408
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
1152
argp_error(state, "Bad delay");
1410
1153
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1418
}
1419
1154
break;
1420
1155
/*
1421
1156
* These reproduce what we would get without ARGP_NO_HELP
1449
1184
case ENOMEM:
1450
1185
default:
1451
1186
errno = ret;
1452
perror_plus("argp_parse");
1187
perror("argp_parse");
1453
1188
exitcode = EX_OSERR;
1454
1189
goto end;
1455
1190
case EINVAL:
1457
1192
goto end;
1458
1193
}
1459
1194
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1519
}
1520
1195
1521
1196
if(not debug){
1522
1197
avahi_set_log_function(empty_log);
1523
1198
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
1199
1550
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
1201
from the signal handler */
1561
1211
sigemptyset(&sigterm_action.sa_mask);
1562
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
1213
if(ret == -1){
1564
perror_plus("sigaddset");
1214
perror("sigaddset");
1565
1215
exitcode = EX_OSERR;
1566
1216
goto end;
1567
1217
}
1568
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
1219
if(ret == -1){
1570
perror_plus("sigaddset");
1220
perror("sigaddset");
1571
1221
exitcode = EX_OSERR;
1572
1222
goto end;
1573
1223
}
1574
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
1225
if(ret == -1){
1576
perror_plus("sigaddset");
1226
perror("sigaddset");
1577
1227
exitcode = EX_OSERR;
1578
1228
goto end;
1579
1229
}
1583
1233
*/
1584
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
1235
if(ret == -1){
1586
perror_plus("sigaction");
1236
perror("sigaction");
1587
1237
return EX_OSERR;
1588
1238
}
1589
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
1241
if(ret == -1){
1592
perror_plus("sigaction");
1242
perror("sigaction");
1593
1243
exitcode = EX_OSERR;
1594
1244
goto end;
1595
1245
}
1596
1246
}
1597
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
1248
if(ret == -1){
1599
perror_plus("sigaction");
1249
perror("sigaction");
1600
1250
return EX_OSERR;
1601
1251
}
1602
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
1254
if(ret == -1){
1605
perror_plus("sigaction");
1255
perror("sigaction");
1606
1256
exitcode = EX_OSERR;
1607
1257
goto end;
1608
1258
}
1609
1259
}
1610
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
1261
if(ret == -1){
1612
perror_plus("sigaction");
1262
perror("sigaction");
1613
1263
return EX_OSERR;
1614
1264
}
1615
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
1267
if(ret == -1){
1618
perror_plus("sigaction");
1268
perror("sigaction");
1619
1269
exitcode = EX_OSERR;
1620
1270
goto end;
1621
1271
}
1622
1272
}
1623
1273
1624
1274
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1626
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1277
if(if_index == 0){
1628
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1638
1288
errno = 0;
1639
1289
ret = seteuid(0);
1640
1290
if(ret == -1){
1641
perror_plus("seteuid");
1291
perror("seteuid");
1642
1292
}
1643
1293
1644
1294
#ifdef __linux__
1648
1298
bool restore_loglevel = true;
1649
1299
if(ret == -1){
1650
1300
restore_loglevel = false;
1651
perror_plus("klogctl");
1301
perror("klogctl");
1652
1302
}
1653
1303
#endif /* __linux__ */
1654
1304
1655
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
1306
if(sd < 0){
1657
perror_plus("socket");
1307
perror("socket");
1658
1308
exitcode = EX_OSERR;
1659
1309
#ifdef __linux__
1660
1310
if(restore_loglevel){
1661
1311
ret = klogctl(7, NULL, 0);
1662
1312
if(ret == -1){
1663
perror_plus("klogctl");
1313
perror("klogctl");
1664
1314
}
1665
1315
}
1666
1316
#endif /* __linux__ */
1668
1318
errno = 0;
1669
1319
ret = seteuid(uid);
1670
1320
if(ret == -1){
1671
perror_plus("seteuid");
1321
perror("seteuid");
1672
1322
}
1673
1323
goto end;
1674
1324
}
1675
1325
strcpy(network.ifr_name, interface);
1676
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
1327
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1679
1329
#ifdef __linux__
1680
1330
if(restore_loglevel){
1681
1331
ret = klogctl(7, NULL, 0);
1682
1332
if(ret == -1){
1683
perror_plus("klogctl");
1333
perror("klogctl");
1684
1334
}
1685
1335
}
1686
1336
#endif /* __linux__ */
1689
1339
errno = 0;
1690
1340
ret = seteuid(uid);
1691
1341
if(ret == -1){
1692
perror_plus("seteuid");
1342
perror("seteuid");
1693
1343
}
1694
1344
goto end;
1695
1345
}
1699
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
1350
if(ret == -1){
1701
1351
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1703
1353
exitcode = EX_OSERR;
1704
1354
#ifdef __linux__
1705
1355
if(restore_loglevel){
1706
1356
ret = klogctl(7, NULL, 0);
1707
1357
if(ret == -1){
1708
perror_plus("klogctl");
1358
perror("klogctl");
1709
1359
}
1710
1360
}
1711
1361
#endif /* __linux__ */
1713
1363
errno = 0;
1714
1364
ret = seteuid(uid);
1715
1365
if(ret == -1){
1716
perror_plus("seteuid");
1366
perror("seteuid");
1717
1367
}
1718
1368
goto end;
1719
1369
}
1720
1370
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1723
1372
for(int i=0; i < delay * 4; i++){
1724
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
1374
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1727
1376
} else if(network.ifr_flags & IFF_RUNNING){
1728
1377
break;
1729
1378
}
1730
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
1380
ret = nanosleep(&sleeptime, NULL);
1732
1381
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1382
perror("nanosleep");
1734
1383
}
1735
1384
}
1736
1385
if(not take_down_interface){
1737
1386
/* We won't need the socket anymore */
1738
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
1388
if(ret == -1){
1740
perror_plus("close");
1389
perror("close");
1741
1390
}
1742
1391
}
1743
1392
#ifdef __linux__
1745
1394
/* Restores kernel loglevel to default */
1746
1395
ret = klogctl(7, NULL, 0);
1747
1396
if(ret == -1){
1748
perror_plus("klogctl");
1397
perror("klogctl");
1749
1398
}
1750
1399
}
1751
1400
#endif /* __linux__ */
1755
1404
/* Lower privileges */
1756
1405
ret = seteuid(uid);
1757
1406
if(ret == -1){
1758
perror_plus("seteuid");
1407
perror("seteuid");
1759
1408
}
1760
1409
} else {
1761
1410
/* Lower privileges permanently */
1762
1411
ret = setuid(uid);
1763
1412
if(ret == -1){
1764
perror_plus("setuid");
1413
perror("setuid");
1765
1414
}
1766
1415
}
1767
1416
}
1783
1432
goto end;
1784
1433
}
1785
1434
1435
tempdir_created = true;
1786
1436
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
1788
1439
goto end;
1789
1440
}
1790
tempdir_created = true;
1791
1441
1792
1442
if(quit_now){
1793
1443
goto end;
1835
1485
1836
1486
port = (uint16_t)tmpmax;
1837
1487
*address = '\0';
1488
address = connect_to;
1838
1489
/* Colon in address indicates IPv6 */
1839
1490
int af;
1840
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
1841
1492
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
1847
}
1848
1493
} else {
1849
1494
af = AF_INET;
1850
1495
}
1851
address = connect_to;
1852
1496
1853
1497
if(quit_now){
1854
1498
goto end;
1855
1499
}
1856
1500
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
1870
1523
exitcode = EXIT_SUCCESS;
1871
1524
}
1872
1873
1525
goto end;
1874
1526
}
1875
1527
1927
1579
if(debug){
1928
1580
fprintf(stderr, "Starting Avahi loop search\n");
1929
1581
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
1937
1584
1938
1585
end:
1939
1586
1960
1607
if(gpgme_initialized){
1961
1608
gpgme_release(mc.ctx);
1962
1609
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1974
1610
1975
1611
/* Take down the network interface */
1976
1612
if(take_down_interface){
1978
1614
errno = 0;
1979
1615
ret = seteuid(0);
1980
1616
if(ret == -1){
1981
perror_plus("seteuid");
1617
perror("seteuid");
1982
1618
}
1983
1619
if(geteuid() == 0){
1984
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
1621
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1622
perror("ioctl SIOCGIFFLAGS");
1987
1623
} else if(network.ifr_flags & IFF_UP) {
1988
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
1626
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
1992
1628
}
1993
1629
}
1994
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
1631
if(ret == -1){
1996
perror_plus("close");
1632
perror("close");
1997
1633
}
1998
1634
/* Lower privileges permanently */
1999
1635
errno = 0;
2000
1636
ret = setuid(uid);
2001
1637
if(ret == -1){
2002
perror_plus("setuid");
1638
perror("setuid");
2003
1639
}
2004
1640
}
2005
1641
}
2006
1642
2007
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2008
1644
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2016
1665
char *fullname = NULL;
2017
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
1667
direntry->d_name);
2019
1668
if(ret < 0){
2020
perror_plus("asprintf");
1669
perror("asprintf");
2021
1670
continue;
2022
1671
}
2023
1672
ret = remove(fullname);
2027
1676
}
2028
1677
free(fullname);
2029
1678
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
1679
closedir(d);
2036
1680
}
2037
1681
ret = rmdir(tempdir);
2038
1682
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
1683
perror("rmdir");
2040
1684
}
2041
1685
}
2042
1686
2047
1691
&old_sigterm_action,
2048
1692
NULL));
2049
1693
if(ret == -1){
2050
perror_plus("sigaction");
1694
perror("sigaction");
2051
1695
}
2052
1696
do {
2053
1697
ret = raise(signal_received);
2054
1698
} while(ret != 0 and errno == EINTR);
2055
1699
if(ret != 0){
2056
perror_plus("raise");
1700
perror("raise");
2057
1701
abort();
2058
1702
}
2059
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0