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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
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.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file
* SIP authentication
*/
#ifndef _AUTH_H
#define _AUTH_H
#include "parser/credentials.h"
#include "parser/request.h"
#include "sockets/url.h"
#include <list>
using namespace std;
/** Size of the credentials cache. */
#define AUTH_CACHE_SIZE 50
/** Credentials cache entry. */
class t_cr_cache_entry {
public:
/**
* Destination for which credentials are cached.
* This is not used for the SIP authentication itself.
*/
t_url to;
/** The credentials. */
t_credentials credentials;
/** Password. */
string passwd;
/** Indicates if proxy authentication was requested. */
bool proxy;
/** Constructor. */
t_cr_cache_entry(const t_url &_to, const t_credentials &_cr,
const string &_passwd, bool _proxy);
};
/** An object of this class authorizes a request given some credentials. */
class t_auth {
private:
/** Indicates if the current registration request is a re-REGISTER. */
bool re_register;
/**
* LRU cache credentials for a destination.
* The first entry in the list is the least recently used.
*/
list<t_cr_cache_entry> cache;
/**
* Find a cache entry that matches the realm.
* @param _to [in] Destination for which authentication is needed.
* @param realm [in] The authentication realm.
* @param proxy [in] Indicates if proxy authentication was requested.
* @return An iterator to the cached credentials if found.
* @return The end iterator if not found.
*/
list<t_cr_cache_entry>::iterator find_cache_entry(const t_url &_to,
const string &realm, bool proxy=false);
/**
* Update cached credentials.
* If the cache does not contain the credentials already
* then it will be added to the end of the list. If the cache
* already contains the maximum number of entries, then the least
* recently used entry will be removed.
* If the cache already contains an entry for credentials, then
* this entry will be moved to the end of the list.
* @param to [in] Destination for which authentication is needed.
* @param cr [in] Credentials to update.
* @param passwd [in] The password to store.
* @param proxy Indicates if proxy authentication was requested.
*/
void update_cache(const t_url &to, const t_credentials &cr,
const string &passwd, bool proxy);
/**
* Check if authorization failed.
* Authorization failed if the challenge is for a realm for which
* the request already contains an authorization header and the
* challenge is not stale.
* @return true, if authorization failed.
* @return false, otherwise.
*/
bool auth_failed(t_request *r, const t_challenge &c,
bool proxy=false) const;
/**
* Remove existing credentials for this challenge from the
* authorization or proxy-authorization header.
* @param r [in] The request from which the credentials must be removed.
* @param c [in] The challenge for which the credentials must be removed.
* @param proxy [in] Indicates if proxy authentication was requested.
*/
void remove_credentials(t_request *r, const t_challenge &c,
bool proxy=false) const;
public:
/** Constructor. */
t_auth();
/**
* Authorize the request based on the challenge in the response
* @param user_config [in] The user profile.
* @param r [in] The request to be authorized.
* @param resp [in] The response containing the challenge.
* @return true, if authorization succeeds.
* @return false, if authorization fails.
* @post On succesful authorization, the credentials has been added to
* the request in the proper header (Authorization or Proxy-Authorization).
*/
bool authorize(t_user *user_config, t_request *r, t_response *resp);
/**
* Remove credentials for a particular realm from cache.
* @param realm [in] The authentication realm.
*/
void remove_from_cache(const string &realm);
/**
* Set the re-REGISTER indication.
* @param on [in] Value to set.
*/
void set_re_register(bool on);
/** Get the re-REGISTER indication. */
bool get_re_register(void) const;
};
#endif
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