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socket-default plugin allocates random ports if configured to 0. 

Also added strongswan.conf options to change the ports.
This commit is contained in:
Tobias Brunner 2012-04-20 14:58:02 +02:00
parent b223d517c8
commit 224ab4c59b
3 changed files with 97 additions and 40 deletions
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6
configure.in
View File

@ -73,7 +73,7 @@ AC_ARG_WITH(
AC_ARG_WITH(
[charon-udp-port],
AS_HELP_STRING([--with-charon-udp-port=port],[UDP port used by charon locally (default 500).]),
AS_HELP_STRING([--with-charon-udp-port=port],[UDP port used by charon locally (default 500). Set to 0 to allocate randomly.]),
[AC_DEFINE_UNQUOTED(CHARON_UDP_PORT, [$withval], [UDP port used by charon locally])
AC_SUBST(charon_udp_port, [$withval])],
[AC_SUBST(charon_udp_port, 500)]
@ -81,14 +81,14 @@ AC_ARG_WITH(
AC_ARG_WITH(
[charon-natt-port],
AS_HELP_STRING([--with-charon-natt-port=port],[UDP port used by charon locally in case a NAT is detected (must be different from charon-udp-port, default 4500)]),
AS_HELP_STRING([--with-charon-natt-port=port],[UDP port used by charon locally in case a NAT is detected (must be different from charon-udp-port, default 4500). Set to 0 to allocate randomly.]),
[AC_DEFINE_UNQUOTED(CHARON_NATT_PORT, [$withval], [UDP post used by charon locally in case a NAT is detected])
AC_SUBST(charon_natt_port, [$withval])],
[AC_SUBST(charon_natt_port, 4500)]
)
AC_MSG_CHECKING([configured UDP ports ($charon_udp_port, $charon_natt_port)])
if test x$charon_udp_port == x$charon_natt_port; then
if test x$charon_udp_port != x0 -a x$charon_udp_port = x$charon_natt_port; then
AC_MSG_ERROR(the ports have to be different)
else
AC_MSG_RESULT(ok)

9
man/strongswan.conf.5.in
View File

@ -210,6 +210,15 @@ Enable multiple authentication exchanges (RFC 4739)
.BR charon.nbns2
WINS servers assigned to peer via configuration payload (CP)
.TP
.BR charon.port " [500]"
UDP port used locally. If set to 0 a random port will be allocated.
.TP
.BR charon.port_nat_t " [4500]"
UDP port used locally in case of NAT-T. If set to 0 a random port will be
allocated. Has to be different from
.BR charon.port ,
otherwise a random port will be allocated.
.TP
.BR charon.process_route " [yes]"
Process RTM_NEWROUTE and RTM_DELROUTE events
.TP

122
src/libcharon/plugins/socket_default/socket_default_socket.c
View File

@ -83,22 +83,32 @@ struct private_socket_default_socket_t {
socket_default_socket_t public;
/**
* IPv4 socket (500)
* Configured port (or random, if initially 0)
*/
u_int16_t port;
/**
* Configured port for NAT-T (or random, if initially 0)
*/
u_int16_t natt;
/**
* IPv4 socket (500 or port)
*/
int ipv4;
/**
* IPv4 socket for NATT (4500)
* IPv4 socket for NAT-T (4500 or natt)
*/
int ipv4_natt;
/**
* IPv6 socket (500)
* IPv6 socket (500 or port)
*/
int ipv6;
/**
* IPv6 socket for NATT (4500)
* IPv6 socket for NAT-T (4500 or natt)
*/
int ipv6_natt;
@ -153,22 +163,22 @@ METHOD(socket_t, receiver, status_t,
if (FD_ISSET(this->ipv4, &rfds))
{
port = CHARON_UDP_PORT;
port = this->port;
selected = this->ipv4;
}
if (FD_ISSET(this->ipv4_natt, &rfds))
{
port = CHARON_NATT_PORT;
port = this->natt;
selected = this->ipv4_natt;
}
if (FD_ISSET(this->ipv6, &rfds))
{
port = CHARON_UDP_PORT;
port = this->port;
selected = this->ipv6;
}
if (FD_ISSET(this->ipv6_natt, &rfds))
{
port = CHARON_NATT_PORT;
port = this->natt;
selected = this->ipv6_natt;
}
if (selected)
@ -305,7 +315,7 @@ METHOD(socket_t, sender, status_t,
/* send data */
sport = src->get_port(src);
family = dst->get_family(dst);
if (sport == 0 || sport == CHARON_UDP_PORT)
if (sport == 0 || sport == this->port)
{
if (family == AF_INET)
{
@ -316,7 +326,7 @@ METHOD(socket_t, sender, status_t,
skt = this->ipv6;
}
}
else if (sport == CHARON_NATT_PORT)
else if (sport == this->natt)
{
if (family == AF_INET)
{
@ -408,14 +418,14 @@ METHOD(socket_t, sender, status_t,
METHOD(socket_t, get_port, u_int16_t,
private_socket_default_socket_t *this, bool nat_t)
{
return nat_t ? CHARON_NATT_PORT : CHARON_UDP_PORT;
return nat_t ? this->natt : this->port;
}
/**
* open a socket to send and receive packets
*/
static int open_socket(private_socket_default_socket_t *this,
int family, u_int16_t port)
int family, u_int16_t *port)
{
int on = TRUE;
struct sockaddr_storage addr;
@ -432,7 +442,7 @@ static int open_socket(private_socket_default_socket_t *this,
{
struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
htoun32(&sin->sin_addr.s_addr, INADDR_ANY);
htoun16(&sin->sin_port, port);
htoun16(&sin->sin_port, *port);
addrlen = sizeof(struct sockaddr_in);
sol = SOL_IP;
#ifdef IP_PKTINFO
@ -446,7 +456,7 @@ static int open_socket(private_socket_default_socket_t *this,
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
memcpy(&sin6->sin6_addr, &in6addr_any, sizeof(in6addr_any));
htoun16(&sin6->sin6_port, port);
htoun16(&sin6->sin6_port, *port);
addrlen = sizeof(struct sockaddr_in6);
sol = SOL_IPV6;
pktinfo = IPV6_RECVPKTINFO;
@ -477,6 +487,32 @@ static int open_socket(private_socket_default_socket_t *this,
return 0;
}
/* retrieve randomly allocated port if needed */
if (*port == 0)
{
if (getsockname(skt, (struct sockaddr *)&addr, &addrlen) < 0)
{
DBG1(DBG_NET, "unable to determine port: %s", strerror(errno));
close(skt);
return 0;
}
switch (family)
{
case AF_INET:
{
struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
*port = untoh16(&sin->sin_port);
break;
}
case AF_INET6:
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
*port = untoh16(&sin6->sin6_port);
break;
}
}
}
/* get additional packet info on receive */
if (pktinfo > 0)
{
@ -493,15 +529,6 @@ static int open_socket(private_socket_default_socket_t *this,
{
DBG1(DBG_NET, "installing IKE bypass policy failed");
}
/* enable UDP decapsulation globally, only for one socket needed */
if (family == AF_INET && port == CHARON_NATT_PORT &&
!hydra->kernel_interface->enable_udp_decap(hydra->kernel_interface,
skt, family, port))
{
DBG1(DBG_NET, "enabling UDP decapsulation failed");
}
return skt;
}
@ -543,44 +570,65 @@ socket_default_socket_t *socket_default_socket_create()
.destroy = _destroy,
},
},
.port = lib->settings->get_int(lib->settings,
"%s.port", CHARON_UDP_PORT, charon->name),
.natt = lib->settings->get_int(lib->settings,
"%s.port_nat_t", CHARON_NATT_PORT, charon->name),
.max_packet = lib->settings->get_int(lib->settings,
"%s.max_packet", MAX_PACKET, charon->name),
"%s.max_packet", MAX_PACKET, charon->name),
);
this->ipv4 = open_socket(this, AF_INET, CHARON_UDP_PORT);
if (this->ipv4 == 0)
if (this->port && this->port == this->natt)
{
DBG1(DBG_NET, "could not open IPv4 socket, IPv4 disabled");
}
else
{
this->ipv4_natt = open_socket(this, AF_INET, CHARON_NATT_PORT);
if (this->ipv4_natt == 0)
{
DBG1(DBG_NET, "could not open IPv4 NAT-T socket");
}
DBG1(DBG_NET, "IKE ports can't be equal, will allocate NAT-T "
"port randomly");
this->natt = 0;
}
this->ipv6 = open_socket(this, AF_INET6, CHARON_UDP_PORT);
/* we allocate IPv6 sockets first as that will reserve randomly allocated
* ports also for IPv4 */
this->ipv6 = open_socket(this, AF_INET6, &this->port);
if (this->ipv6 == 0)
{
DBG1(DBG_NET, "could not open IPv6 socket, IPv6 disabled");
}
else
{
this->ipv6_natt = open_socket(this, AF_INET6, CHARON_NATT_PORT);
this->ipv6_natt = open_socket(this, AF_INET6, &this->natt);
if (this->ipv6_natt == 0)
{
DBG1(DBG_NET, "could not open IPv6 NAT-T socket");
}
}
this->ipv4 = open_socket(this, AF_INET, &this->port);
if (this->ipv4 == 0)
{
DBG1(DBG_NET, "could not open IPv4 socket, IPv4 disabled");
}
else
{
this->ipv4_natt = open_socket(this, AF_INET, &this->natt);
if (this->ipv4_natt == 0)
{
DBG1(DBG_NET, "could not open IPv4 NAT-T socket");
}
}
if (!this->ipv4 && !this->ipv6)
{
DBG1(DBG_NET, "could not create any sockets");
destroy(this);
return NULL;
}
/* enable UDP decapsulation globally, only for one socket needed */
if (!hydra->kernel_interface->enable_udp_decap(hydra->kernel_interface,
this->ipv6_natt ?: this->ipv4_natt,
this->ipv6_natt ? AF_INET6 : AF_INET, this->natt))
{
DBG1(DBG_NET, "enabling UDP decapsulation failed");
}
return &this->public;
}