auth.c

来自「eCos操作系统源码」· C语言 代码 · 共 893 行 · 第 1/2 页

	bit = 0;
    }

    /*
     * If we have overridden addresses based on auth info
     * then set that information now before continuing.
     */
    auth_set_ip_addr(unit);

    /*
     * 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);
}


/*
 * np_up - a network protocol has come up.
 */
void
np_up(unit, proto)
    int unit, proto;
{
    if (num_np_up == 0) {
	/*
	 * At this point we consider that the link has come up successfully.
	 */
	need_holdoff = 0;

	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;
}

/*
 * np_down - a network protocol has gone down.
 */
void
np_down(unit, proto)
    int unit, proto;
{
    if (--num_np_up == 0 && idle_time_limit > 0) {
	UNTIMEOUT(check_idle, NULL);
    }
}

/*
 * np_finished - a network protocol has finished using the link.
 */
void
np_finished(unit, proto)
    int 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(arg)
     void *arg;
{
    struct ppp_idle idle;
    time_t itime;

    if (!get_idle_time(0, &idle))
	return;
    itime = MIN(idle.xmit_idle, idle.recv_idle);
    if (itime >= idle_time_limit) {
	/* link is idle: shut it down. */
	syslog(LOG_INFO, "Terminating connection due to lack of activity.");
	lcp_close(0, "Link inactive");
    } else {
	TIMEOUT(check_idle, NULL, idle_time_limit - itime);
    }
}

/*
 * connect_time_expired - log a message and close the connection.
 */
static void
connect_time_expired(arg)
    void *arg;
{
    syslog(LOG_INFO, "Connect time expired");
    lcp_close(0, "Connect time expired");	/* Close connection */
}

/*
 * auth_check_options - called to check authentication options.
 */
void
auth_check_options()
{
    lcp_options *wo = &lcp_wantoptions[0];
    int can_auth;
    ipcp_options *ipwo = &ipcp_wantoptions[0];
    u_int32_t remote;

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

    /* If authentication is required, ask peer for CHAP or PAP. */
    if (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 && (uselogin || have_pap_secret());
    if (!can_auth && wo->neg_chap) {
	remote = ipwo->accept_remote? 0: ipwo->hisaddr;
	can_auth = have_chap_secret(remote_name, our_name, remote);
    }

    if (auth_required && !can_auth) {
	option_error("peer authentication required but no suitable secret(s) found\n");
	if (remote_name[0] == 0)
	    option_error("for authenticating any peer to us (%s)\n", our_name);
	else
	    option_error("for authenticating peer %s to us (%s)\n",
			 remote_name, our_name);
	exit(1);
    }

    /*
     * Check whether the user tried to override certain values
     * set by root.
     */
    if (!auth_required && auth_req_info.priv > 0) {
	if (!default_device && devnam_info.priv == 0) {
	    option_error("can't override device name when noauth option used");
	    exit(1);
	}
	if ((connector != NULL && connector_info.priv == 0)
	    || (disconnector != NULL && disconnector_info.priv == 0)
	    || (welcomer != NULL && welcomer_info.priv == 0)) {
	    option_error("can't override connect, disconnect or welcome");
	    option_error("option values when noauth option used");
	    exit(1);
	}
    }
}

/*
 * 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(unit)
    int unit;
{
    lcp_options *go = &lcp_gotoptions[unit];
    lcp_options *ao = &lcp_allowoptions[0];
    ipcp_options *ipwo = &ipcp_wantoptions[0];
    u_int32_t remote;
    ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
    ao->neg_chap = !refuse_chap
	&& have_chap_secret(user, remote_name, (u_int32_t)0);
    if (go->neg_upap && !uselogin && !have_pap_secret())
	go->neg_upap = 0;
    if (go->neg_chap) {
	remote = ipwo->accept_remote? 0: ipwo->hisaddr;
	if (!have_chap_secret(remote_name, our_name, remote))
	    go->neg_chap = 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(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
    int unit;
    char *auser;
    int userlen;
    char *apasswd;
    int passwdlen;
    char **msg;
    int *msglen;
{
    db_printf("%s called\n", __PRETTY_FUNCTION__);
    return 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(unit)
    int unit;
{
    db_printf("%s called\n", __PRETTY_FUNCTION__);
    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(passwd)
    char *passwd;
{
    db_printf("%s called\n", __PRETTY_FUNCTION__);
    return 0;
}


/*
 * 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()
{
    db_printf("%s called\n", __PRETTY_FUNCTION__);
    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(client, server, remote)
    char *client;
    char *server;
    u_int32_t remote;
{
//    db_printf("%s(%s,%s,%d) called\n", __PRETTY_FUNCTION__,client,server,remote);
    return 1;
}


/*
 * 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(unit, client, server, secret, secret_len, save_addrs)
    int unit;
    char *client;
    char *server;
    char *secret;
    int *secret_len;
    int save_addrs;
{
    db_printf("%s(%d,%s,%s,%08x,%d,%d) called\n", __PRETTY_FUNCTION__,
                unit, client, server, secret, secret_len, save_addrs);
    // We use the PAP password as the CHAP secret also.
    strncpy( secret, passwd, MAXNAMELEN );
    *secret_len = strlen(secret);
    return 1;
}

static void
auth_set_ip_addr(unit)
    int unit;
{
    db_printf("%s called\n", __PRETTY_FUNCTION__);
}

/*
 * 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(unit, addr)
    int unit;
    u_int32_t addr;
{
    return ip_addr_check(addr, addresses[unit]);
}

static int
ip_addr_check(addr, addrs)
    u_int32_t addr;
    struct wordlist *addrs;
{
    int x, y;
//    u_int32_t a, mask, ah;
    u_int32_t a = -1, mask;    
    int accept;
    char *ptr_word, *ptr_mask;
//    struct hostent *hp;
//    struct netent *np;

    /* don't allow loopback or multicast address */
    if (bad_ip_adrs(addr))
	return 0;

    if (addrs == NULL)
	return !auth_required;		/* no addresses authorized */

    x = y = 0;
    for (; addrs != NULL; addrs = addrs->next) {
	y++;
	/* "-" means no addresses authorized, "*" means any address allowed */
	ptr_word = addrs->word;
	if (strcmp(ptr_word, "-") == 0)
	    break;
	if (strcmp(ptr_word, "*") == 0)
	    return 1;

	/*
	 * A colon in the string means that we wish to force a specific
	 * local:remote address, but we ignore these for now.
	 */
	if (strchr(addrs->word, ':') != NULL)
	    x++;
	else {

	accept = 1;
	if (*ptr_word == '!') {
	    accept = 0;
	    ++ptr_word;
	}

	mask = ~ (u_int32_t) 0;
	ptr_mask = strchr (ptr_word, '/');
	if (ptr_mask != NULL) {
	    int bit_count;

	    bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
	    if (bit_count <= 0 || bit_count > 32) {
		syslog (LOG_WARNING,
			"invalid address length %s in auth. address list",
			ptr_mask);
		continue;
	    }
	    *ptr_mask = '\0';
	    mask <<= 32 - bit_count;
	}

#ifndef __ECOS
	hp = gethostbyname(ptr_word);
	if (hp != NULL && hp->h_addrtype == AF_INET) {
	    a = *(u_int32_t *)hp->h_addr;
	} else {
	    np = getnetbyname (ptr_word);
	    if (np != NULL && np->n_addrtype == AF_INET) {
		a = htonl (*(u_int32_t *)np->n_net);
		if (ptr_mask == NULL) {
		    /* calculate appropriate mask for net */
		    ah = ntohl(a);
		    if (IN_CLASSA(ah))
			mask = IN_CLASSA_NET;
		    else if (IN_CLASSB(ah))
			mask = IN_CLASSB_NET;
		    else if (IN_CLASSC(ah))
			mask = IN_CLASSC_NET;
		}
	    } else {
		a = inet_addr (ptr_word);
	    }
	}
#endif
        
	if (ptr_mask != NULL)
	    *ptr_mask = '/';

	if (a == (u_int32_t)-1L)
	    syslog (LOG_WARNING,
		    "unknown host %s in auth. address list",
		    addrs->word);
	else
	    /* Here a and addr are in network byte order,
	       and mask is in host order. */
	    if (((addr ^ a) & htonl(mask)) == 0)
		return accept;
    }	/* else */
    }
    return x == y;			/* not in list => can't have it */
}

/*
 * 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(addr)
    u_int32_t addr;
{
    addr = ntohl(addr);
    return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
	|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
}

/*
 * check_access - complain if a secret file has too-liberal permissions.
 */
void
check_access(f, filename)
    FILE *f;
    char *filename;
{
    struct stat sbuf;

    if (fstat(fileno(f), &sbuf) < 0) {
	syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
    } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
	syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
    }
}