auth.c

lwip-1.4.0

  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: unit %d; Lowering up all protocols...\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);
  }
}

/*
 * Proceed to the network phase.
 */
static void
network_phase(int unit)
{
  int i;
  struct protent *protp;
  lcp_options *go = &lcp_gotoptions[unit];

  /*
   * If the peer had to authenticate, run the auth-up script now.
   */
  if ((go->neg_chap || go->neg_upap) && !did_authup) {
    /* XXX Do setup for peer authentication. */
    did_authup = 1;
  }

#if CBCP_SUPPORT
  /*
   * If we negotiated callback, do it now.
   */
  if (go->neg_cbcp) {
    lcp_phase[unit] = PHASE_CALLBACK;
    (*cbcp_protent.open)(unit);
    return;
  }
#endif /* CBCP_SUPPORT */

  lcp_phase[unit] = PHASE_NETWORK;
  for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
    if (protp->protocol < 0xC000 && protp->enabled_flag && protp->open != NULL) {
      (*protp->open)(unit);
      if (protp->protocol != PPP_CCP) {
        ++num_np_open;
      }
    }
  }

  if (num_np_open == 0) {
    /* nothing to do */
    lcp_close(0, "No network protocols running");
  }
}
/* @todo: add void start_networks(void) here (pppd 2.3.11) */

/*
 * 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 > (int)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);
  }

  /*
   * 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.
   */
  pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode);
  lcp_close(unit, "Failed to authenticate ourselves to peer");
}

/*
 * 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) {
    /* no further use for the link: shut up shop. */
    lcp_close(0, "No network protocols running");
  }
}

/*
 * check_idle - check whether the link has been idle for long
 * enough that we can shut it down.
 */
static void
check_idle(void *arg)
{
  struct ppp_idle idle;
  u_short itime;
  
  LWIP_UNUSED_ARG(arg);
  if (!get_idle_time(0, &idle)) {
    return;
  }
  itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
  if (itime >= ppp_settings.idle_time_limit) {
    /* link is idle: shut it down. */
    AUTHDEBUG(LOG_INFO, ("Terminating connection due to lack of activity.\n"));
    lcp_close(0, "Link inactive");
  } else {
    TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime);
  }
}

/*
 * connect_time_expired - log a message and close the connection.
 */
static void
connect_time_expired(void *arg)
{
  LWIP_UNUSED_ARG(arg);

  AUTHDEBUG(LOG_INFO, ("Connect time expired\n"));
  lcp_close(0, "Connect time expired");   /* Close connection */
}

#if 0 /* UNUSED */
/*
 * auth_check_options - called to check authentication options.
 */
void
auth_check_options(void)
{
  lcp_options *wo = &lcp_wantoptions[0];
  int can_auth;
  ipcp_options *ipwo = &ipcp_wantoptions[0];
  u32_t remote;

  /* Default our_name to hostname, and user to our_name */
  if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname) {
      strcpy(ppp_settings.our_name, ppp_settings.hostname);
  }

  if (ppp_settings.user[0] == 0) {
    strcpy(ppp_settings.user, ppp_settings.our_name);
  }

  /* If authentication is required, ask peer for CHAP or PAP. */
  if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) {
    wo->neg_chap = 1;
    wo->neg_upap = 1;
  }
  
  /*
   * Check whether we have appropriate secrets to use
   * to authenticate the peer.
   */
  can_auth = wo->neg_upap && have_pap_secret();
  if (!can_auth && wo->neg_chap) {
    remote = ipwo->accept_remote? 0: ipwo->hisaddr;
    can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote);
  }

  if (ppp_settings.auth_required && !can_auth) {
    ppp_panic("No auth secret");
  }
}
#endif /* UNUSED */

/*
 * auth_reset - called when LCP is starting negotiations to recheck
 * authentication options, i.e. whether we have appropriate secrets
 * to use for authenticating ourselves and/or the peer.
 */
void
auth_reset(int unit)
{
  lcp_options *go = &lcp_gotoptions[unit];
  lcp_options *ao = &lcp_allowoptions[0];
  ipcp_options *ipwo = &ipcp_wantoptions[0];
  u32_t remote;

  AUTHDEBUG(LOG_INFO, ("auth_reset: %d\n", unit));
  ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL));
  ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/;

  if (go->neg_upap && !have_pap_secret()) {
    go->neg_upap = 0;
  }
  if (go->neg_chap) {
    remote = ipwo->accept_remote? 0: ipwo->hisaddr;
    if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote)) {
      go->neg_chap = 0;
    }
  }
}

#if PAP_SUPPORT
/*
 * check_passwd - Check the user name and passwd against the PAP secrets
 * file.  If requested, also check against the system password database,
 * and login the user if OK.
 *
 * returns:
 *  UPAP_AUTHNAK: Authentication failed.
 *  UPAP_AUTHACK: Authentication succeeded.
 * In either case, msg points to an appropriate message.
 */
u_char
check_passwd( int unit, char *auser, int userlen, char *apasswd, int passwdlen, char **msg, int *msglen)
{
#if 1 /* XXX Assume all entries OK. */
  LWIP_UNUSED_ARG(unit);
  LWIP_UNUSED_ARG(auser);
  LWIP_UNUSED_ARG(userlen);
  LWIP_UNUSED_ARG(apasswd);
  LWIP_UNUSED_ARG(passwdlen);
  LWIP_UNUSED_ARG(msglen);
  *msg = (char *) 0;
  return UPAP_AUTHACK;     /* XXX Assume all entries OK. */
#else
  u_char ret = 0;
  struct wordlist *addrs = NULL;
  char passwd[256], user[256];
  char secret[MAXWORDLEN];
  static u_short attempts = 0;
  
  /*
   * Make copies of apasswd and auser, then null-terminate them.
   */
  BCOPY(apasswd, passwd, passwdlen);
  passwd[passwdlen] = '\0';
  BCOPY(auser, user, userlen);
  user[userlen] = '\0';
  *msg = (char *) 0;

  /* XXX Validate user name and password. */
  ret = UPAP_AUTHACK;     /* XXX Assume all entries OK. */