www.pudn.com > strongswan-4.2.4.rar > child_cfg.c
/*
* Copyright (C) 2008 Tobias Brunner
* Copyright (C) 2005-2007 Martin Willi
* Copyright (C) 2005 Jan Hutter
* 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 .
*
* 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.
*
* $Id: child_cfg.c 4062 2008-06-12 11:42:19Z martin $
*/
#include "child_cfg.h"
#include
ENUM(mode_names, MODE_TRANSPORT, MODE_BEET,
"TRANSPORT",
"TUNNEL",
"2",
"3",
"BEET",
);
ENUM(action_names, ACTION_NONE, ACTION_RESTART,
"ACTION_NONE",
"ACTION_ROUTE",
"ACTION_RESTART",
);
ENUM_BEGIN(ipcomp_transform_names, IPCOMP_NONE, IPCOMP_NONE,
"IPCOMP_NONE");
ENUM_NEXT(ipcomp_transform_names, IPCOMP_OUI, IPCOMP_LZJH, IPCOMP_NONE,
"IPCOMP_OUI",
"IPCOMP_DEFLATE",
"IPCOMP_LZS",
"IPCOMP_LZJH");
ENUM_END(ipcomp_transform_names, IPCOMP_LZJH);
typedef struct private_child_cfg_t private_child_cfg_t;
/**
* Private data of an child_cfg_t object
*/
struct private_child_cfg_t {
/**
* Public part
*/
child_cfg_t public;
/**
* Number of references hold by others to this child_cfg
*/
refcount_t refcount;
/**
* Name of the child_cfg, used to query it
*/
char *name;
/**
* list for all proposals
*/
linked_list_t *proposals;
/**
* list for traffic selectors for my site
*/
linked_list_t *my_ts;
/**
* list for traffic selectors for others site
*/
linked_list_t *other_ts;
/**
* updown script
*/
char *updown;
/**
* allow host access
*/
bool hostaccess;
/**
* Mode to propose for a initiated CHILD: tunnel/transport
*/
mode_t mode;
/**
* action to take on DPD
*/
action_t dpd_action;
/**
* action to take on CHILD_SA close
*/
action_t close_action;
/**
* Time before an SA gets invalid
*/
u_int32_t lifetime;
/**
* Time before an SA gets rekeyed
*/
u_int32_t rekeytime;
/**
* Time, which specifies the range of a random value
* substracted from rekeytime.
*/
u_int32_t jitter;
/**
* enable IPComp
*/
bool use_ipcomp;
};
/**
* Implementation of child_cfg_t.get_name
*/
static char *get_name(private_child_cfg_t *this)
{
return this->name;
}
/**
* Implementation of child_cfg_t.add_proposal
*/
static void add_proposal(private_child_cfg_t *this, proposal_t *proposal)
{
this->proposals->insert_last(this->proposals, proposal);
}
/**
* Implementation of child_cfg_t.get_proposals
*/
static linked_list_t* get_proposals(private_child_cfg_t *this, bool strip_dh)
{
enumerator_t *enumerator;
proposal_t *current;
linked_list_t *proposals = linked_list_create();
enumerator = this->proposals->create_enumerator(this->proposals);
while (enumerator->enumerate(enumerator, ¤t))
{
current = current->clone(current);
if (strip_dh)
{
current->strip_dh(current);
}
proposals->insert_last(proposals, current);
}
enumerator->destroy(enumerator);
return proposals;
}
/**
* Implementation of child_cfg_t.get_name
*/
static proposal_t* select_proposal(private_child_cfg_t*this,
linked_list_t *proposals, bool strip_dh)
{
enumerator_t *stored_enum, *supplied_enum;
proposal_t *stored, *supplied, *selected = NULL;
stored_enum = this->proposals->create_enumerator(this->proposals);
supplied_enum = proposals->create_enumerator(proposals);
/* compare all stored proposals with all supplied. Stored ones are preferred. */
while (stored_enum->enumerate(stored_enum, &stored))
{
stored = stored->clone(stored);
while (supplied_enum->enumerate(supplied_enum, &supplied))
{
if (strip_dh)
{
stored->strip_dh(stored);
}
selected = stored->select(stored, supplied);
if (selected)
{
DBG2(DBG_CFG, "received proposals: %#P", proposals);
DBG2(DBG_CFG, "configured proposals: %#P", this->proposals);
DBG2(DBG_CFG, "selected proposal: %P", selected);
break;
}
}
stored->destroy(stored);
if (selected)
{
break;
}
supplied_enum->destroy(supplied_enum);
supplied_enum = proposals->create_enumerator(proposals);
}
stored_enum->destroy(stored_enum);
supplied_enum->destroy(supplied_enum);
if (selected == NULL)
{
DBG1(DBG_CFG, "received proposals: %#P", proposals);
DBG1(DBG_CFG, "configured proposals: %#P", this->proposals);
}
return selected;
}
/**
* Implementation of child_cfg_t.get_name
*/
static void add_traffic_selector(private_child_cfg_t *this, bool local,
traffic_selector_t *ts)
{
if (local)
{
this->my_ts->insert_last(this->my_ts, ts);
}
else
{
this->other_ts->insert_last(this->other_ts, ts);
}
}
/**
* Implementation of child_cfg_t.get_name
*/
static linked_list_t* get_traffic_selectors(private_child_cfg_t *this, bool local,
linked_list_t *supplied,
host_t *host)
{
enumerator_t *e1, *e2;
traffic_selector_t *ts1, *ts2, *selected;
linked_list_t *result = linked_list_create();
if (local)
{
e1 = this->my_ts->create_enumerator(this->my_ts);
}
else
{
e1 = this->other_ts->create_enumerator(this->other_ts);
}
/* no list supplied, just fetch the stored traffic selectors */
if (supplied == NULL)
{
DBG2(DBG_CFG, "proposing traffic selectors for %s:",
local ? "us" : "other");
while (e1->enumerate(e1, &ts1))
{
/* we make a copy of the TS, this allows us to update dynamic TS' */
selected = ts1->clone(ts1);
if (host)
{
selected->set_address(selected, host);
}
DBG2(DBG_CFG, " %R (derived from %R)", selected, ts1);
result->insert_last(result, selected);
}
e1->destroy(e1);
}
else
{
DBG2(DBG_CFG, "selecting traffic selectors for %s:",
local ? "us" : "other");
e2 = supplied->create_enumerator(supplied);
/* iterate over all stored selectors */
while (e1->enumerate(e1, &ts1))
{
/* we make a copy of the TS, as we have to update dynamic TS' */
ts1 = ts1->clone(ts1);
if (host)
{
ts1->set_address(ts1, host);
}
/* iterate over all supplied traffic selectors */
while (e2->enumerate(e2, &ts2))
{
selected = ts1->get_subset(ts1, ts2);
if (selected)
{
DBG2(DBG_CFG, " config: %R, received: %R => match: %R",
ts1, ts2, selected);
result->insert_last(result, selected);
}
else
{
DBG2(DBG_CFG, " config: %R, received: %R => no match",
ts1, ts2, selected);
}
}
e2->destroy(e2);
e2 = supplied->create_enumerator(supplied);
ts1->destroy(ts1);
}
e1->destroy(e1);
e2->destroy(e2);
}
/* remove any redundant traffic selectors in the list */
e1 = result->create_enumerator(result);
e2 = result->create_enumerator(result);
while (e1->enumerate(e1, &ts1))
{
while (e2->enumerate(e2, &ts2))
{
if (ts1 != ts2)
{
if (ts2->is_contained_in(ts2, ts1))
{
result->remove_at(result, e2);
ts2->destroy(ts2);
e1->destroy(e1);
e1 = result->create_enumerator(result);
break;
}
if (ts1->is_contained_in(ts1, ts2))
{
result->remove_at(result, e1);
ts1->destroy(ts1);
e2->destroy(e2);
e2 = result->create_enumerator(result);
break;
}
}
}
}
e1->destroy(e1);
e2->destroy(e2);
return result;
}
/**
* Implementation of child_cfg_t.get_name
*/
static char* get_updown(private_child_cfg_t *this)
{
return this->updown;
}
/**
* Implementation of child_cfg_t.get_name
*/
static bool get_hostaccess(private_child_cfg_t *this)
{
return this->hostaccess;
}
/**
* Implementation of child_cfg_t.get_name
*/
static u_int32_t get_lifetime(private_child_cfg_t *this, bool rekey)
{
if (rekey)
{
if (this->jitter == 0)
{
return this->rekeytime;
}
return this->rekeytime - (random() % this->jitter);
}
return this->lifetime;
}
/**
* Implementation of child_cfg_t.get_mode
*/
static mode_t get_mode(private_child_cfg_t *this)
{
return this->mode;
}
/**
* Implementation of child_cfg_t.get_dpd_action
*/
static action_t get_dpd_action(private_child_cfg_t *this)
{
return this->dpd_action;
}
/**
* Implementation of child_cfg_t.get_close_action
*/
static action_t get_close_action(private_child_cfg_t *this)
{
return this->close_action;
}
/**
* Implementation of child_cfg_t.get_dh_group.
*/
static diffie_hellman_group_t get_dh_group(private_child_cfg_t *this)
{
enumerator_t *enumerator;
proposal_t *proposal;
u_int16_t dh_group = MODP_NONE;
enumerator = this->proposals->create_enumerator(this->proposals);
while (enumerator->enumerate(enumerator, &proposal))
{
if (proposal->get_algorithm(proposal, DIFFIE_HELLMAN_GROUP, &dh_group, NULL))
{
break;
}
}
enumerator->destroy(enumerator);
return dh_group;
}
/**
* Implementation of child_cfg_t.use_ipcomp.
*/
static bool use_ipcomp(private_child_cfg_t *this)
{
return this->use_ipcomp;
}
/**
* Implementation of child_cfg_t.get_name
*/
static child_cfg_t* get_ref(private_child_cfg_t *this)
{
ref_get(&this->refcount);
return &this->public;
}
/**
* Implements child_cfg_t.destroy.
*/
static void destroy(private_child_cfg_t *this)
{
if (ref_put(&this->refcount))
{
this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
if (this->updown)
{
free(this->updown);
}
free(this->name);
free(this);
}
}
/*
* Described in header-file
*/
child_cfg_t *child_cfg_create(char *name, u_int32_t lifetime,
u_int32_t rekeytime, u_int32_t jitter,
char *updown, bool hostaccess, mode_t mode,
action_t dpd_action, action_t close_action, bool ipcomp)
{
private_child_cfg_t *this = malloc_thing(private_child_cfg_t);
this->public.get_name = (char* (*) (child_cfg_t*))get_name;
this->public.add_traffic_selector = (void (*)(child_cfg_t*,bool,traffic_selector_t*))add_traffic_selector;
this->public.get_traffic_selectors = (linked_list_t*(*)(child_cfg_t*,bool,linked_list_t*,host_t*))get_traffic_selectors;
this->public.add_proposal = (void (*) (child_cfg_t*,proposal_t*))add_proposal;
this->public.get_proposals = (linked_list_t* (*) (child_cfg_t*,bool))get_proposals;
this->public.select_proposal = (proposal_t* (*) (child_cfg_t*,linked_list_t*,bool))select_proposal;
this->public.get_updown = (char* (*) (child_cfg_t*))get_updown;
this->public.get_hostaccess = (bool (*) (child_cfg_t*))get_hostaccess;
this->public.get_mode = (mode_t (*) (child_cfg_t *))get_mode;
this->public.get_dpd_action = (action_t (*) (child_cfg_t *))get_dpd_action;
this->public.get_close_action = (action_t (*) (child_cfg_t *))get_close_action;
this->public.get_lifetime = (u_int32_t (*) (child_cfg_t *,bool))get_lifetime;
this->public.get_dh_group = (diffie_hellman_group_t(*)(child_cfg_t*)) get_dh_group;
this->public.use_ipcomp = (bool (*) (child_cfg_t *))use_ipcomp;
this->public.get_ref = (child_cfg_t* (*) (child_cfg_t*))get_ref;
this->public.destroy = (void (*) (child_cfg_t*))destroy;
this->name = strdup(name);
this->lifetime = lifetime;
this->rekeytime = rekeytime;
this->jitter = jitter;
this->updown = updown ? strdup(updown) : NULL;
this->hostaccess = hostaccess;
this->mode = mode;
this->dpd_action = dpd_action;
this->close_action = close_action;
this->use_ipcomp = ipcomp;
this->refcount = 1;
this->proposals = linked_list_create();
this->my_ts = linked_list_create();
this->other_ts = linked_list_create();
return &this->public;
}