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strongswan/src/pluto/connections.h

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/* information about connections between hosts and clients
* Copyright (C) 1998-2001 D. Hugh Redelmeier
* Copyright (C) 2009-2010 Andreas Steffen - Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef _CONNECTIONS_H
#define _CONNECTIONS_H
#include <sys/queue.h>
#include <utils/host.h>
#include <utils/linked_list.h>
#include <utils/identification.h>
#include <credentials/ietf_attributes/ietf_attributes.h>
#include "certs.h"
#include "smartcard.h"
#include "whack.h"
/* There are two kinds of connections:
* - ISAKMP connections, between hosts (for IKE communication)
* - IPsec connections, between clients (for secure IP communication)
*
* An ISAKMP connection looks like:
* host<--->host
*
* An IPsec connection looks like:
* client-subnet<-->host<->nexthop<--->nexthop<->host<-->client-subnet
*
* For the connection to be relevant to this instance of Pluto,
* exactly one of the hosts must be a public interface of our machine
* known to this instance.
*
* The client subnet might simply be the host -- this is a
* representation of "host mode".
*
* Each nexthop defaults to the neighbouring host's IP address.
* The nexthop is a property of the pair of hosts, not each
* individually. It is only needed for IPsec because of the
* way IPsec is mixed into the kernel routing logic. Furthermore,
* only this end's nexthop is actually used. Eventually, nexthop
* will be unnecessary.
*
* Other information represented:
* - each connection has a name: a chunk of uninterpreted text
* that is unique for each connection.
* - security requirements (currently just the "policy" flags from
* the whack command to initiate the connection, but eventually
* much more. Different for ISAKMP and IPsec connections.
* - rekeying parameters:
* + time an SA may live
* + time before SA death that a rekeying should be attempted
* (only by the initiator)
* + number of times to attempt rekeying
* - With the current KLIPS, we must route packets for a client
* subnet through the ipsec interface (ipsec0). Only one
* gateway can get traffic for a specific (client) subnet.
* Furthermore, if the routing isn't in place, packets will
* be sent in the clear.
* "routing" indicates whether the routing has been done for
* this connection. Note that several connections may claim
* the same routing, as long as they agree about where the
* packets are to be sent.
* - With the current KLIPS, only one outbound IPsec SA bundle can be
* used for a particular client. This is due to a limitation
* of using only routing for selection. So only one IPsec state (SA)
* may "own" the eroute. "eroute_owner" is the serial number of
* this state, SOS_NOBODY if there is none. "routing" indicates
* what kind of erouting has been done for this connection, if any.
*
* Details on routing is in constants.h
*
* Operations on Connections:
*
* - add a new connection (with all details) [whack command]
* - delete a connection (by name) [whack command]
* - initiate a connection (by name) [whack command]
* - find a connection (by IP addresses of hosts)
* [response to peer request; finding ISAKMP connection for IPsec connection]
*
* Some connections are templates, missing the address of the peer
* (represented by INADDR_ANY). These are always arranged so that the
* missing end is "that" (there can only be one missing end). These can
* be instantiated (turned into real connections) by Pluto in one of two
* different ways: Road Warrior Instantiation or Opportunistic
* Instantiation. A template connection is marked for Opportunistic
* Instantiation by specifying the peer client as 0.0.0.0/32 (or the IPV6
* equivalent). Otherwise, it is suitable for Road Warrior Instantiation.
*
* Instantiation creates a new temporary connection, with the missing
* details filled in. The resulting template lasts only as long as there
* is a state that uses it.
*/
/* connection policy priority: how important this policy is
* - used to implement eroute-like precedence (augmented by a small
* bonus for a routed connection).
* - a whole number
* - larger is more important
* - three subcomponents. In order of decreasing significance:
* + length of source subnet mask (8 bits)
* + length of destination subnet mask (8 bits)
* + bias (8 bit)
* - a bias of 1 is added to allow prio BOTTOM_PRIO to be less than all
* normal priorities
* - other bias values are created on the fly to give mild preference
* to certaion conditions (eg. routedness)
* - priority is inherited -- an instance of a policy has the same priority
* as the original policy, even though its subnets might be smaller.
* - display format: n,m
*/
typedef unsigned long policy_prio_t;
#define BOTTOM_PRIO ((policy_prio_t)0) /* smaller than any real prio */
#define set_policy_prio(c) { (c)->prio = \
((policy_prio_t)(c)->spd.this.client.maskbits << 16) \
| ((policy_prio_t)(c)->spd.that.client.maskbits << 8) \
| (policy_prio_t)1; }
#define POLICY_PRIO_BUF (3+1+3+1)
extern void fmt_policy_prio(policy_prio_t pp, char buf[POLICY_PRIO_BUF]);
struct virtual_t;
struct end {
identification_t *id;
ip_address host_addr, host_nexthop;
host_t *host_srcip;
ip_subnet client;
bool is_left;
bool key_from_DNS_on_demand;
bool has_client;
bool has_client_wildcard;
bool has_port_wildcard;
bool has_id_wildcards;
bool has_natip;
char *updown;
u_int16_t host_port; /* host order */
u_int16_t port; /* host order */
u_int8_t protocol;
cert_t *cert; /* end certificate */
identification_t *ca; /* CA distinguished name */
ietf_attributes_t *groups; /* access control groups */
smartcard_t *sc; /* smartcard reader and key info */
struct virtual_t *virt;
bool modecfg; /* this end: request local address from server */
/* that end: give local addresses to clients */
char *pool; /* name of an associated virtual IP address pool */
bool hostaccess; /* allow access to host via iptables INPUT/OUTPUT */
/* rules if client behind host is a subnet */
bool allow_any; /* IP address is subject to change */
certpolicy_t sendcert; /* whether or not to send the certificate */
};
struct spd_route {
struct spd_route *next;
struct end this;
struct end that;
so_serial_t eroute_owner;
enum routing_t routing; /* level of routing in place */
uint32_t reqid;
};
typedef struct connection connection_t;
struct connection {
char *name;
bool ikev1;
lset_t policy;
time_t sa_ike_life_seconds;
time_t sa_ipsec_life_seconds;
time_t sa_rekey_margin;
unsigned long sa_rekey_fuzz;
unsigned long sa_keying_tries;
/* RFC 3706 DPD */
time_t dpd_delay;
time_t dpd_timeout;
dpd_action_t dpd_action;
char *log_file_name; /* name of log file */
FILE *log_file; /* possibly open FILE */
TAILQ_ENTRY(connection) log_link; /* linked list of open conns */
bool log_file_err; /* only bitch once */
struct spd_route spd;
/* internal fields: */
unsigned long instance_serial;
policy_prio_t prio;
bool instance_initiation_ok; /* this is an instance of a policy that mandates initiate */
enum connection_kind kind;
const struct iface *interface; /* filled in iff oriented */
so_serial_t /* state object serial number */
newest_isakmp_sa,
newest_ipsec_sa;
#ifdef DEBUG
lset_t extra_debugging;
#endif
/* note: if the client is the gateway, the following must be equal */
sa_family_t addr_family; /* between gateways */
sa_family_t tunnel_addr_family; /* between clients */
connection_t *policy_next; /* if multiple policies,
next one to apply */
struct gw_info *gw_info;
struct alg_info_esp *alg_info_esp;
struct alg_info_ike *alg_info_ike;
struct host_pair *host_pair;
connection_t *hp_next; /* host pair list link */
connection_t *ac_next; /* all connections list link */
linked_list_t *requested_ca; /* collected certificate requests */
linked_list_t *requested; /* requested attributes with handlers */
linked_list_t *attributes; /* configuration attributes with handlers */
bool got_certrequest;
};
#define oriented(c) ((c).interface != NULL)
extern bool orient(connection_t *c);
extern bool same_peer_ids(const connection_t *c, const connection_t *d,
identification_t *his_id);
/* Format the topology of a connection end, leaving out defaults.
* Largest left end looks like: client === host : port [ host_id ] --- hop
* Note: if that==NULL, skip nexthop
*/
#define END_BUF (SUBNETTOT_BUF + ADDRTOT_BUF + IDTOA_BUF + ADDRTOT_BUF + 10)
extern size_t format_end(char *buf, size_t buf_len, const struct end *this,
const struct end *that, bool is_left, lset_t policy);
extern void add_connection(const whack_message_t *wm);
extern void initiate_connection(const char *name, int whackfd);
extern void initiate_opportunistic(const ip_address *our_client,
const ip_address *peer_client,
int transport_proto, bool held, int whackfd);
extern void terminate_connection(const char *nm);
extern void release_connection(connection_t *c, bool relations);
extern void delete_connection(connection_t *c, bool relations);
extern void delete_connections_by_name(const char *name, bool strict);
extern void delete_every_connection(void);
extern char *add_group_instance(connection_t *group, const ip_subnet *target);
extern void remove_group_instance(const connection_t *group, const char *name);
extern void release_dead_interfaces(void);
extern void check_orientations(void);
extern connection_t *route_owner(connection_t *c, struct spd_route **srp,
connection_t **erop, struct spd_route **esrp);
extern connection_t *shunt_owner(const ip_subnet *ours, const ip_subnet *his);
extern bool uniqueIDs; /* --uniqueids? */
extern void ISAKMP_SA_established(connection_t *c, so_serial_t serial);
#define id_is_ipaddr(id) ((id)->get_type(id) == ID_IPV4_ADDR || \
(id)->get_type(id) == ID_IPV6_ADDR)
extern bool his_id_was_instantiated(const connection_t *c);
struct state; /* forward declaration of tag (defined in state.h) */
extern connection_t* con_by_name(const char *nm, bool strict);
extern connection_t* find_host_connection(const ip_address *me,
u_int16_t my_port,
const ip_address *him,
u_int16_t his_port, lset_t policy);
extern connection_t* refine_host_connection(const struct state *st,
identification_t *id,
identification_t *peer_ca);
extern connection_t* find_client_connection(connection_t *c,
const ip_subnet *our_net,
const ip_subnet *peer_net,
const u_int8_t our_protocol,
const u_int16_t out_port,
const u_int8_t peer_protocol,
const u_int16_t peer_port);
extern connection_t* find_connection_by_reqid(uint32_t reqid);
extern connection_t* find_connection_for_clients(struct spd_route **srp,
const ip_address *our_client,
const ip_address *peer_client,
int transport_proto);
extern void get_peer_ca_and_groups(connection_t *c,
identification_t **peer_ca,
ietf_attributes_t **peer_attributes);
/* instantiating routines
* Note: connection_discard() is in state.h because all its work
* is looking through state objects.
*/
struct gw_info; /* forward declaration of tag (defined in dnskey.h) */
struct alg_info; /* forward declaration of tag (defined in alg_info.h) */
extern connection_t *rw_instantiate(connection_t *c,
const ip_address *him,
u_int16_t his_port,
const ip_subnet *his_net,
identification_t *his_id);
extern connection_t *oppo_instantiate(connection_t *c,
const ip_address *him,
identification_t *his_id,
struct gw_info *gw,
const ip_address *our_client,
const ip_address *peer_client);
extern connection_t
*build_outgoing_opportunistic_connection(struct gw_info *gw,
const ip_address *our_client,
const ip_address *peer_client);
#define CONN_INST_BUF BUF_LEN
extern void fmt_conn_instance(const connection_t *c, char buf[CONN_INST_BUF]);
/* operations on "pending", the structure representing Quick Mode
* negotiations delayed until a Keying Channel has been negotiated.
*/
struct pending; /* forward declaration (opaque outside connections.c) */
extern void add_pending(int whack_sock, struct state *isakmp_sa,
connection_t *c, lset_t policy, unsigned long try,
so_serial_t replacing);
extern void release_pending_whacks(struct state *st, err_t story);
extern void unpend(struct state *st);
extern void update_pending(struct state *os, struct state *ns);
extern void flush_pending_by_state(struct state *st);
extern void show_pending_phase2(const struct host_pair *hp, const struct state *st);
extern void connection_discard(connection_t *c);
/* A template connection's eroute can be eclipsed by
* either a %hold or an eroute for an instance iff
* the template is a /32 -> /32. This requires some special casing.
*/
#define eclipsable(sr) (subnetishost(&(sr)->this.client) && subnetishost(&(sr)->that.client))
extern long eclipse_count;
extern connection_t *eclipsed(connection_t *c, struct spd_route **);
/* print connection status */
extern void show_connections_status(bool all, const char *name);
extern int connection_compare(const connection_t *ca
, const connection_t *cb);
extern void update_host_pair(const char *why, connection_t *c
, const ip_address *myaddr, u_int16_t myport
, const ip_address *hisaddr, u_int16_t hisport);
#endif /* _CONNECTIONS_H */
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