auth.c

基于STM32F107的UDP服务器程序

/*****************************************************************************
* auth.c - Network Authentication and Phase Control program file.
*
* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
* 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
*
* 03-01-01 Marc Boucher <[e-mail]>
*   Ported to lwIP.
* 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 "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "ppp.h"
#include "pppdebug.h"

#include "fsm.h"
#include "lcp.h"
#include "pap.h"
#include "chap.h"
#include "auth.h"
#include "ipcp.h"

#if CBCP_SUPPORT
#include "cbcp.h"
#endif /* CBCP_SUPPORT */

/*************************/
/*** 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 (const char *, const char *);

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

static void network_phase (int);
static void check_idle (void *);
static void connect_time_expired (void *);
#if 0
static int  login (char *, char *, char **, int *);
#endif
static void logout (void);
static int  null_login (int);
static int  get_pap_passwd (int, char *, char *);
static int  have_pap_secret (void);
static int  have_chap_secret (char *, char *, u32_t);
static int  ip_addr_check (u32_t, struct wordlist *);
#if 0 /* PAP_SUPPORT || CHAP_SUPPORT */
static void set_allowed_addrs(int unit, struct wordlist *addrs);
static void free_wordlist (struct wordlist *);
#endif /* 0 */ /* PAP_SUPPORT || CHAP_SUPPORT */
#if CBCP_SUPPORT
static void callback_phase (int);
#endif /* CBCP_SUPPORT */


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


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

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


/***********************************/
/*** 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.
 */
void
link_required(int unit)
{
  LWIP_UNUSED_ARG(unit);

  AUTHDEBUG((LOG_INFO, "link_required: %d\n", unit));
}

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

/*
 * 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\n", unit));
  if (did_authup) {
    /* XXX Do link down processing. */
    did_authup = 0;
  }
  for (i = 0; (protp = ppp_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;
  }
  pppLinkDown(unit);
}

/*
 * 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 || CHAP_SUPPORT
  lcp_options *ho = &lcp_hisoptions[unit];
#endif /* PAP_SUPPORT || CHAP_SUPPORT */

  AUTHDEBUG((LOG_INFO, "link_established: %d\n", unit));
  /*
   * Tell higher-level protocols that LCP is up.
   */
  for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
    if (protp->protocol != PPP_LCP && protp->enabled_flag && protp->lowerup != NULL) {
      (*protp->lowerup)(unit);
    }
  }
  if (ppp_settings.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)) {
      AUTHDEBUG((LOG_WARNING, "peer refused to authenticate\n"));
      lcp_close(unit, "peer refused to authenticate");
      return;
    }
  }
    
  lcp_phase[unit] = PHASE_AUTHENTICATE;
  auth = 0;
#if CHAP_SUPPORT
  if (go->neg_chap) {
    ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype);
    auth |= CHAP_PEER;
  } 
#endif /* CHAP_SUPPORT */
#if PAP_SUPPORT && CHAP_SUPPORT
  else
#endif /* PAP_SUPPORT && CHAP_SUPPORT */
#if PAP_SUPPORT
  if (go->neg_upap) {
    upap_authpeer(unit);
    auth |= PAP_PEER;
  }
#endif /* PAP_SUPPORT */
#if CHAP_SUPPORT
  if (ho->neg_chap) {
    ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype);
    auth |= CHAP_WITHPEER;
  }
#endif /* CHAP_SUPPORT */
#if PAP_SUPPORT && CHAP_SUPPORT
  else
#endif /* PAP_SUPPORT && CHAP_SUPPORT */
#if PAP_SUPPORT
  if (ho->neg_upap) {
    if (ppp_settings.passwd[0] == 0) {
      passwd_from_file = 1;
      if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd)) {
        AUTHDEBUG((LOG_ERR, "No secret found for PAP login\n"));
      }
    }
    upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd);
    auth |= PAP_WITHPEER;
  }
#endif /* PAP_SUPPORT */
  auth_pending[unit] = auth;

  if (!auth) {
    network_phase(unit);
  }
}

/*
 * The peer has failed to authenticate himself using `protocol'.
 */
void
auth_peer_fail(int unit, u16_t protocol)
{
  LWIP_UNUSED_ARG(protocol);

  AUTHDEBUG((LOG_INFO, "auth_peer_fail: %d proto=%X\n", unit, protocol));
  /*
   * Authentication failure: take the link down
   */
  lcp_close(unit, "Authentication failed");
}


#if PAP_SUPPORT || CHAP_SUPPORT
/*
 * The peer has been successfully authenticated using `protocol'.
 */
void
auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
{
  int pbit;
  
  AUTHDEBUG((LOG_INFO, "auth_peer_success: %d proto=%X\n", unit, protocol));
  switch (protocol) {
    case PPP_CHAP:
      pbit = CHAP_PEER;
      break;
    case PPP_PAP:
      pbit = PAP_PEER;
      break;
    default:
      AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", 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] &= ~pbit) == 0) {
    network_phase(unit);
  }
}

/*
 * We have failed to authenticate ourselves to the peer using `protocol'.
 */
void
auth_withpeer_fail(int unit, u16_t protocol)
{
  int errCode = PPPERR_AUTHFAIL;
  
  LWIP_UNUSED_ARG(protocol);

  AUTHDEBUG((LOG_INFO, "auth_withpeer_fail: %d proto=%X\n", unit, protocol));
  if (passwd_from_file) {
    BZERO(ppp_settings.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, u16_t protocol)
{
  int pbit;
  
  AUTHDEBUG((LOG_INFO, "auth_withpeer_success: %d proto=%X\n", unit, protocol));
  switch (protocol) {
    case PPP_CHAP:
      pbit = CHAP_WITHPEER;
      break;
    case PPP_PAP:
      if (passwd_from_file) {
        BZERO(ppp_settings.passwd, MAXSECRETLEN);
      }
      pbit = PAP_WITHPEER;
      break;
    default:
      AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n", protocol));
      pbit = 0;
  }
  
  /*
   * If there is no more authentication still being done,
   * proceed to the network (or callback) phase.
   */
  if ((auth_pending[unit] &= ~pbit) == 0) {
    network_phase(unit);
  }
}
#endif /* PAP_SUPPORT || CHAP_SUPPORT */


/*
 * np_up - a network protocol has come up.
 */
void
np_up(int unit, u16_t proto)
{
  LWIP_UNUSED_ARG(unit);
  LWIP_UNUSED_ARG(proto);

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

/*
 * np_down - a network protocol has gone down.
 */
void
np_down(int unit, u16_t proto)
{
  LWIP_UNUSED_ARG(unit);
  LWIP_UNUSED_ARG(proto);

  AUTHDEBUG((LOG_INFO, "np_down: %d proto=%X\n", unit, proto));
  if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) {
    UNTIMEOUT(check_idle, NULL);
  }
}

/*
 * np_finished - a network protocol has finished using the link.
 */
void
np_finished(int unit, u16_t proto)
{
  LWIP_UNUSED_ARG(unit);
  LWIP_UNUSED_ARG(proto);

  AUTHDEBUG((LOG_INFO, "np_finished: %d proto=%X\n", unit, proto));
  if (--num_np_open <= 0) {