netauth.c

UCOS-ii对于网络的支持代码

/*****************************************************************************
* netauth.c - Network Authentication and Phase Control program file.
*
* Copyright (c) 1997 by Global Election Systems Inc.  All rights reserved.
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice and the following disclaimer are included verbatim in any 
* distributions. No written agreement, license, or royalty fee is required
* for any of the authorized uses.
*
* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
* REVISION HISTORY
*
* 97-12-08 Guy Lancaster <[e-mail]>, Global Election Systems Inc.
*	Ported from public pppd code.
*****************************************************************************/
/*
 * auth.c - PPP authentication and phase control.
 *
 * Copyright (c) 1993 The Australian National University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the Australian National University.  The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "typedefs.h"
#include "avconfig.h"

#include "stdio.h"
#include <string.h>
#include "malloc.h"
#include "netbuf.h"
#include "timer.h"
#include "avos.h"
#include "time.h"

#include "net.h"
#include "netfsm.h"
#include "netlcp.h"
#include "netpap.h"
#include "netchap.h"
#include "netauth.h"
#include "netppp.h"
#include "netipcp.h"

#if CBCP_SUPPORT > 0
#include "netcbcp.h"
#endif

#include "debug.h"


/*************************/
/*** LOCAL DEFINITIONS ***/
/*************************/

/* Bits in auth_pending[] */
#define PAP_WITHPEER	1
#define PAP_PEER	2
#define CHAP_WITHPEER	4
#define CHAP_PEER	8


                                                                    
/************************/
/*** LOCAL DATA TYPES ***/
/************************/
/* Used for storing a sequence of words.  Usually malloced. */
struct wordlist {
    struct wordlist	*next;
    char		word[1];
};



/***********************************/
/*** LOCAL FUNCTION DECLARATIONS ***/
/***********************************/
extern char *crypt __P((const char *, const char *));

/* Prototypes for procedures local to this file. */

static void network_phase __P((int));
static void check_idle __P((void *));
static void connect_time_expired __P((void *));
#ifdef XXX
static int  login __P((char *, char *, char **, int *));
#endif
static void logout __P((void));
static int  null_login __P((int));
static int  get_pap_passwd __P((int));
static int  have_pap_secret __P((void));
static int  have_chap_secret __P((char *, char *, u_int32_t));
static int  ip_addr_check __P((u_int32_t, struct wordlist *));
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
static void set_allowed_addrs(int unit, struct wordlist *addrs);
static void free_wordlist __P((struct wordlist *));
#endif
#if CBCP_SUPPORT > 0
static void callback_phase __P((int));
#endif


/******************************/
/*** PUBLIC DATA STRUCTURES ***/
/******************************/


/*****************************/
/*** LOCAL DATA STRUCTURES ***/
/*****************************/
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
/* The name by which the peer authenticated itself to us. */
static char peer_authname[MAXNAMELEN];
#endif

/* Records which authentication operations haven't completed yet. */
static int auth_pending[NUM_PPP];

/* Set if we have successfully called login() */
static int logged_in;

/* Set if we have run the /etc/ppp/auth-up script. */
static int did_authup;

/* List of addresses which the peer may use. */
static struct wordlist *addresses[NUM_PPP];

/* Number of network protocols which we have opened. */
static int num_np_open;

/* Number of network protocols which have come up. */
static int num_np_up;

#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
/* Set if we got the contents of passwd[] from the pap-secrets file. */
static int passwd_from_file;
#endif



/***********************************/
/*** PUBLIC FUNCTION DEFINITIONS ***/
/***********************************/
/*
 * An Open on LCP has requested a change from Dead to Establish phase.
 * Do what's necessary to bring the physical layer up.
 */
#pragma argsused
void link_required(int unit)
{
	AUTHDEBUG((LOG_INFO, "link_required: %d", unit));
}

/*
 * LCP has terminated the link; go to the Dead phase and take the
 * physical layer down.
 */
#pragma argsused
void link_terminated(int unit)
{
	AUTHDEBUG((LOG_INFO, "link_terminated: %d", unit));
	
	if (lcp_phase[unit] == PHASE_DEAD)
		return;
	if (logged_in)
		logout();
	lcp_phase[unit] = PHASE_DEAD;
	trace(LOG_NOTICE, "Connection terminated.");
}

/*
 * LCP has gone down; it will either die or try to re-establish.
 */
void link_down(int unit)
{
	int i;
	struct protent *protp;
	
	AUTHDEBUG((LOG_INFO, "link_down: %d", unit));
	if (did_authup) {
		/* XXX Do link down processing. */
		did_authup = 0;
	}
	for (i = 0; (protp = protocols[i]) != NULL; ++i) {
		if (!protp->enabled_flag)
			continue;
		if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
			(*protp->lowerdown)(unit);
		if (protp->protocol < 0xC000 && protp->close != NULL)
			(*protp->close)(unit, "LCP down");
	}
	num_np_open = 0;
	num_np_up = 0;
	if (lcp_phase[unit] != PHASE_DEAD)
		lcp_phase[unit] = PHASE_TERMINATE;
}

/*
 * The link is established.
 * Proceed to the Dead, Authenticate or Network phase as appropriate.
 */
void link_established(int unit)
{
	int auth;
	int i;
	struct protent *protp;
	lcp_options *wo = &lcp_wantoptions[unit];
	lcp_options *go = &lcp_gotoptions[unit];
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
	lcp_options *ho = &lcp_hisoptions[unit];
#endif
	
	AUTHDEBUG((LOG_INFO, "link_established: %d", unit));
	/*
	 * Tell higher-level protocols that LCP is up.
	 */
	for (i = 0; (protp = protocols[i]) != NULL; ++i)
		if (protp->protocol != PPP_LCP && protp->enabled_flag
				&& protp->lowerup != NULL)
			(*protp->lowerup)(unit);
	
	if (auth_required && !(go->neg_chap || go->neg_upap)) {
		/*
		 * We wanted the peer to authenticate itself, and it refused:
		 * treat it as though it authenticated with PAP using a username
		 * of "" and a password of "".  If that's not OK, boot it out.
		 */
		if (!wo->neg_upap || !null_login(unit)) {
			trace(LOG_WARNING, "peer refused to authenticate");
			lcp_close(unit, "peer refused to authenticate");
			return;
		}
	}
	
	lcp_phase[unit] = PHASE_AUTHENTICATE;
	auth = 0;
#if CHAP_SUPPORT > 0
	if (go->neg_chap) {
		ChapAuthPeer(unit, our_name, go->chap_mdtype);
		auth |= CHAP_PEER;
	} 
#endif
#if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0
	else
#endif
#if PAP_SUPPORT > 0
	if (go->neg_upap) {
		upap_authpeer(unit);
		auth |= PAP_PEER;
	}
#endif
#if CHAP_SUPPORT > 0
	if (ho->neg_chap) {
		ChapAuthWithPeer(unit, user, ho->chap_mdtype);
		auth |= CHAP_WITHPEER;
	}
#endif
#if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0
	else
#endif
#if PAP_SUPPORT > 0
	if (ho->neg_upap) {
		if (passwd[0] == 0) {
			passwd_from_file = 1;
			if (!get_pap_passwd(unit))
				trace(LOG_ERR, "No secret found for PAP login");
		}
		upap_authwithpeer(unit, user, passwd);
		auth |= PAP_WITHPEER;
	}
#endif
	auth_pending[unit] = auth;
	
	if (!auth)
		network_phase(unit);
}


/*
 * The peer has failed to authenticate himself using `protocol'.
 */
#pragma argsused
void auth_peer_fail(int unit, int protocol)
{
	AUTHDEBUG((LOG_INFO, "auth_peer_fail: %d proto=%X", unit, protocol));
	/*
	 * Authentication failure: take the link down
	 */
	lcp_close(unit, "Authentication failed");
}


#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
/*
 * The peer has been successfully authenticated using `protocol'.
 */
void auth_peer_success(int unit, int protocol, char *name, int namelen)
{
	int bit;
	
	AUTHDEBUG((LOG_INFO, "auth_peer_success: %d proto=%X", unit, protocol));
	switch (protocol) {
	case PPP_CHAP:
		bit = CHAP_PEER;
		break;
	case PPP_PAP:
		bit = PAP_PEER;
		break;
	default:
		trace(LOG_WARNING, "auth_peer_success: unknown protocol %x",
			   protocol);
		return;
	}
	
	/*
	 * Save the authenticated name of the peer for later.
	 */
	if (namelen > sizeof(peer_authname) - 1)
		namelen = sizeof(peer_authname) - 1;
	BCOPY(name, peer_authname, namelen);
	peer_authname[namelen] = 0;
	
	/*
	 * If there is no more authentication still to be done,
	 * proceed to the network (or callback) phase.
	 */
	if ((auth_pending[unit] &= ~bit) == 0)
		network_phase(unit);
}

/*
 * We have failed to authenticate ourselves to the peer using `protocol'.
 */
#pragma argsused
void auth_withpeer_fail(int unit, int protocol)
{
	int errCode = PPPERR_AUTHFAIL;
	
	AUTHDEBUG((LOG_INFO, "auth_withpeer_fail: %d proto=%X", unit, protocol));
	if (passwd_from_file)
		BZERO(passwd, MAXSECRETLEN);
	/* 
	 * XXX Warning: the unit number indicates the interface which is
	 * not necessarily the PPP connection.  It works here as long
	 * as we are only supporting PPP interfaces.
	 */
	pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode);

	/*
	 * We've failed to authenticate ourselves to our peer.
	 * He'll probably take the link down, and there's not much
	 * we can do except wait for that.
	 */
}

/*
 * We have successfully authenticated ourselves with the peer using `protocol'.
 */
void auth_withpeer_success(int unit, int protocol)
{
	int bit;
	
	AUTHDEBUG((LOG_INFO, "auth_withpeer_success: %d proto=%X", unit, protocol));
	switch (protocol) {
	case PPP_CHAP:
		bit = CHAP_WITHPEER;
		break;
	case PPP_PAP:
		if (passwd_from_file)
		    BZERO(passwd, MAXSECRETLEN);
		bit = PAP_WITHPEER;
		break;
	default:
		trace(LOG_WARNING, "auth_peer_success: unknown protocol %x",
		       protocol);
		bit = 0;
	}
	
	/*
	 * If there is no more authentication still being done,
	 * proceed to the network (or callback) phase.
	 */
	if ((auth_pending[unit] &= ~bit) == 0)
		network_phase(unit);
}
#endif


/*
 * np_up - a network protocol has come up.
 */
#pragma argsused
void np_up(int unit, int proto)
{
	AUTHDEBUG((LOG_INFO, "np_up: %d proto=%X", unit, proto));
	if (num_np_up == 0) {
		/*
		 * At this point we consider that the link has come up successfully.
		 */
		if (idle_time_limit > 0)
			TIMEOUT(check_idle, NULL, idle_time_limit);
		
		/*
		 * Set a timeout to close the connection once the maximum
		 * connect time has expired.
		 */
		if (maxconnect > 0)
			TIMEOUT(connect_time_expired, 0, maxconnect);
	}
	++num_np_up;
}