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Added -c flag to disable IP/port checking in each request

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Erik Ekman 2008-07-12 22:39:29 +00:00 committed by Erik Ekman
parent 06f60e2a3b
commit 0d3494ae78
3 changed files with 26 additions and 13 deletions
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2
CHANGELOG
View file

@ -12,6 +12,8 @@ CHANGES:
- Applied a security patch from Andrew Griffiths, use setgroups() to
limit the groups of the user
- Applied a patch to make iodine work on (Open)Solaris, from Albert Lee
- Added option in server (-c) to disable IP/port checking on each packet,
will hopefully help when server is behind NAT
2007-11-30: 0.4.1 "Tea Online"
- Introduced encoding API

16
man/iodine.8
View file

@ -1,5 +1,5 @@
.\" groff -man -Tascii iodine.8
.TH IODINE 8 "JUN 2007" "User Manuals"
.TH IODINE 8 "JUL 2008" "User Manuals"
.SH NAME
iodine, iodined \- tunnel IPv4 over DNS
.SH SYNOPSIS
@ -25,7 +25,7 @@ iodine, iodined \- tunnel IPv4 over DNS
.B iodined [-h]
.B iodined [-f] [-s] [-u
.B iodined [-c] [-s] [-f] [-u
.I user
.B ] [-P
.I password
@ -62,10 +62,6 @@ Print usage info and exit.
.B -f
Keep running in foreground.
.TP
.B -s
Don't try to configure IP address or MTU. This should only be used if
you have already configured the device that will be used.
.TP
.B -u user
Drop privileges and run as user 'user' after setting up tunnel.
.TP
@ -82,6 +78,14 @@ Use the TUN device 'device' instead of the normal one, which is dnsX on Linux
and otherwise tunX.
.SS Server Options:
.TP
.B -c
Disable checks on client IP and port on all incoming requests.
This might help if server is behind a NAT firewall.
.TP
.B -s
Don't try to configure IP address or MTU. This should only be used if
you have already configured the device that will be used.
.TP
.B -m mtu
Set 'mtu' as mtu size for the tunnel device. This will be sent to the client
on connect, and the client will use the same mtu.

21
src/iodined.c
View file

@ -49,6 +49,7 @@ static char *topdomain;
static char password[33];
static struct encoder *b32;
static int check_ip;
static int my_mtu;
static in_addr_t my_ip;
@ -191,8 +192,8 @@ tunnel_dns(int tun_fd, int dns_fd)
users[userid].last_pkt = time(NULL);
login_calculate(logindata, 16, password, users[userid].seed);
if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
if (check_ip && (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0)) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else {
if (read >= 18 && (memcmp(logindata, unpacked+1, 16) == 0)) {
@ -248,8 +249,8 @@ tunnel_dns(int tun_fd, int dns_fd)
}
/* Check sending ip number */
if (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0) {
if (check_ip && (dummy.q.fromlen != users[userid].addrlen ||
memcmp(&(users[userid].host), &(dummy.q.from), dummy.q.fromlen) != 0)) {
write_dns(dns_fd, &(dummy.q), "BADIP", 5);
} else {
/* decode with this users encoding */
@ -402,7 +403,7 @@ static void
usage() {
extern char *__progname;
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
printf("Usage: %s [-v] [-h] [-c] [-s] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
"[-l ip address to listen on] [-p port] [-P password]"
" tunnel_ip topdomain\n", __progname);
exit(2);
@ -413,11 +414,13 @@ help() {
extern char *__progname;
printf("iodine IP over DNS tunneling server\n");
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
printf("Usage: %s [-v] [-h] [-c] [-s] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
"[-l ip address to listen on] [-p port] [-P password]"
" tunnel_ip topdomain\n", __progname);
printf(" -v to print version info and exit\n");
printf(" -h to print this help and exit\n");
printf(" -c to disable check of client IP/port on each request\n");
printf(" -s to skip creating and configuring the tun device which then has to be created manually\n");
printf(" -f to keep running in foreground\n");
printf(" -u name to drop privileges and run as user 'name'\n");
printf(" -t dir to chroot to directory dir\n");
@ -463,6 +466,7 @@ main(int argc, char **argv)
mtu = 1024;
listen_ip = INADDR_ANY;
port = 53;
check_ip = 1;
skipipconfig = 0;
b32 = get_base32_encoder();
@ -478,11 +482,14 @@ main(int argc, char **argv)
memset(password, 0, sizeof(password));
srand(time(NULL));
while ((choice = getopt(argc, argv, "vsfhu:t:d:m:l:p:P:")) != -1) {
while ((choice = getopt(argc, argv, "vcsfhu:t:d:m:l:p:P:")) != -1) {
switch(choice) {
case 'v':
version();
break;
case 'c':
check_ip = 0;
break;
case 's':
skipipconfig = 1;
break;