/* * 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 > 0/* * 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. */int check_passwd(	int unit,	char *auser,	int userlen,	char *apasswd,	int passwdlen,	char **msg,	int *msglen){#if 1	*msg = (char *) 0;	return UPAP_AUTHACK;     /* XXX Assume all entries OK. */#else    int 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. */            if (ret == UPAP_AUTHNAK) {        if (*msg == (char *) 0)            *msg = "Login incorrect";        *msglen = strlen(*msg);        /*         * Frustrate passwd stealer programs.         * Allow 10 tries, but start backing off after 3 (stolen from login).         * On 10'th, drop the connection.         */        if (attempts++ >= 10) {            AUTHDEBUG((LOG_WARNING, "%d LOGIN FAILURES BY %s\n", attempts, user));            /*ppp_panic("Excess Bad Logins");*/        }        if (attempts > 3) {            sys_msleep((attempts - 3) * 5);        }        if (addrs != NULL) {            free_wordlist(addrs);        }    } else {        attempts = 0;           /* Reset count */        if (*msg == (char *) 0)            *msg = "Login ok";        *msglen = strlen(*msg);        set_allowed_addrs(unit, addrs);    }        BZERO(passwd, sizeof(passwd));    BZERO(secret, sizeof(secret));        return ret;#endif}#endif/* * auth_ip_addr - check whether the peer is authorized to use * a given IP address.  Returns 1 if authorized, 0 otherwise. */int auth_ip_addr(int unit, u32_t addr){    return ip_addr_check(addr, addresses[unit]);}/* * bad_ip_adrs - return 1 if the IP address is one we don't want * to use, such as an address in the loopback net or a multicast address. * addr is in network byte order. */int bad_ip_adrs(u32_t addr){    addr = ntohl(addr);    return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET        || IN_MULTICAST(addr) || IN_BADCLASS(addr);}#if CHAP_SUPPORT > 0/* * get_secret - open the CHAP secret file and return the secret * for authenticating the given client on the given server. * (We could be either client or server). */int get_secret(    int unit,    char *client,    char *server,    char *secret,    int *secret_len,    int save_addrs){#if 1    int len;    struct wordlist *addrs;        addrs = NULL;    if(!client || !client[0] || strcmp(client, ppp_settings.user)) {	return 0;    }    len = strlen(ppp_settings.passwd);    if (len > MAXSECRETLEN) {        AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server));        len = MAXSECRETLEN;    }    BCOPY(ppp_settings.passwd, secret, len);    *secret_len = len;        return 1;#else    int ret = 0, len;    struct wordlist *addrs;    char secbuf[MAXWORDLEN];        addrs = NULL;    secbuf[0] = 0;    /* XXX Find secret. */      if (ret < 0)        return 0;        if (save_addrs)        set_allowed_addrs(unit, addrs);        len = strlen(secbuf);    if (len > MAXSECRETLEN) {        AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server));        len = MAXSECRETLEN;    }    BCOPY(secbuf, secret, len);    BZERO(secbuf, sizeof(secbuf));    *secret_len = len;        return 1;#endif}#endif#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/**********************************//*** LOCAL FUNCTION DEFINITIONS ***//**********************************//* * 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 > 0    /*     * If we negotiated callback, do it now.     */    if (go->neg_cbcp) {        lcp_phase[unit] = PHASE_CALLBACK;        (*cbcp_protent.open)(unit);        return;    }#endif        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");}/* * 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;    	(void)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){	(void)arg;    AUTHDEBUG((LOG_INFO, "Connect time expired\n"));    lcp_close(0, "Connect time expired");   /* Close connection */}#if 0/* * login - Check the user name and password against the system * password database, and login the user if OK. * * returns: *  UPAP_AUTHNAK: Login failed. *  UPAP_AUTHACK: Login succeeded. * In either case, msg points to an appropriate message. */static int login(char *user, char *passwd, char **msg, int *msglen){    /* XXX Fail until we decide that we want to support logins. */    return (UPAP_AUTHNAK);}#endif/* * logout - Logout the user. */static void logout(void){    logged_in = 0;}/* * null_login - Check if a username of "" and a password of "" are * acceptable, and iff so, set the list of acceptable IP addresses * and return 1. */static int null_login(int unit){	(void)unit;    /* XXX Fail until we decide that we want to support logins. */    return 0;}/* * get_pap_passwd - get a password for authenticating ourselves with * our peer using PAP.  Returns 1 on success, 0 if no suitable password * could be found. */static int get_pap_passwd(int unit, char *user, char *passwd){/* normally we would reject PAP if no password is provided,   but this causes problems with some providers (like CHT in Taiwan)   who incorrectly request PAP and expect a bogus/empty password, so   always provide a default user/passwd of "none"/"none"*/    if(user)    	strcpy(user,   "none");    if(passwd)    	strcpy(passwd, "none");    return 1;}/* * have_pap_secret - check whether we have a PAP file with any * secrets that we could possibly use for authenticating the peer. */static int have_pap_secret(void){    /* XXX Fail until we set up our passwords. */    return 0;}/* * have_chap_secret - check whether we have a CHAP file with a * secret that we could possibly use for authenticating `client' * on `server'.  Either can be the null string, meaning we don't * know the identity yet. */static int have_chap_secret(char *client, char *server, u32_t remote){	(void)client;	(void)server;	(void)remote;    /* XXX Fail until we set up our passwords. */    return 0;}#if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 *//* * set_allowed_addrs() - set the list of allowed addresses. */static void set_allowed_addrs(int unit, struct wordlist *addrs){    if (addresses[unit] != NULL)        free_wordlist(addresses[unit]);    addresses[unit] = addrs;#if 0    /*     * If there's only one authorized address we might as well     * ask our peer for that one right away     */    if (addrs != NULL && addrs->next == NULL) {        char *p = addrs->word;        struct ipcp_options *wo = &ipcp_wantoptions[unit];        u32_t a;        struct hostent *hp;                if (wo->hisaddr == 0 && *p != '!' && *p != '-'                && strchr(p, '/') == NULL) {            hp = gethostbyname(p);            if (hp != NULL && hp->h_addrtype == AF_INET)                a = *(u32_t *)hp->h_addr;            else                a = inet_addr(p);            if (a != (u32_t) -1)                wo->hisaddr = a;        }    }#endif}#endifstatic int ip_addr_check(u32_t addr, struct wordlist *addrs){        /* don't allow loopback or multicast address */    if (bad_ip_adrs(addr))        return 0;        if (addrs == NULL)        return !ppp_settings.auth_required;      /* no addresses authorized */        /* XXX All other addresses allowed. */    return 1;}#if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT *//* * free_wordlist - release memory allocated for a wordlist. */static void free_wordlist(struct wordlist *wp){    struct wordlist *next;        while (wp != NULL) {        next = wp->next;        free(wp);        wp = next;    }}#endif#endif /* PPP_SUPPORT */