389-ds-base/ldap/servers/plugins/rootdn_access/rootdn_access.c

/** BEGIN COPYRIGHT BLOCK
 * This Program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; version 2 of the License.
 *
 * This Program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
 * Non-GPL Code may instantiate templates or use macros or inline functions from
 * the Approved Interfaces without causing the resulting work to be covered by
 * the GNU General Public License. Only Red Hat, Inc. may make changes or
 * additions to the list of Approved Interfaces. You must obey the GNU General
 * Public License in all respects for all of the Program code and other code used
 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
 * provide this exception without modification, you must delete this exception
 * statement from your version and license this file solely under the GPL without
 * exception.
 *
 *
 * Copyright (C) 2012 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

/*
 *  Root DN Access Control plug-in
 */
#include "rootdn_access.h"
#include <nspr.h>
#include <time.h>
#include <ctype.h>

/*
 * Add an entry like the following to dse.ldif to enable this plugin:
 *
 *   dn: cn=RootDN Access Control,cn=plugins,cn=config
 *   objectclass: top
 *   objectclass: nsSlapdPlugin
 *   objectclass: extensibleObject
 *   cn: RootDN Access Control
 *   nsslapd-pluginpath: librootdn-access-plugin.so
 *   nsslapd-plugininitfunc: rootdn_init
 *   nsslapd-plugintype: rootdnpreoperation
 *   nsslapd-pluginenabled: on
 *   nsslapd-plugin-depends-on-type: database
 *   nsslapd-pluginid: rootdn-access-control
 *   rootdn-open-time: 0800
 *   rootdn-close-time: 1700
 *   rootdn-days-allowed: Mon, Tue, Wed, Thu, Fri
 *   rootdn-allow-host: *.redhat.com
 *   rootdn-allow-host: *.fedora.com
 *   rootdn-deny-host: dangerous.boracle.com
 *   rootdn-allow-ip: 127.0.0.1
 *   rootdn-allow-ip: 2000:db8:de30::11
 *   rootdn-deny-ip: 192.168.1.*
 *
 */

/*
 *  Plugin Functions
 */
int rootdn_init(Slapi_PBlock *pb);
static int rootdn_start(Slapi_PBlock *pb);
static int rootdn_load_config(Slapi_PBlock *pb);
static int rootdn_check_access(Slapi_PBlock *pb);
static int rootdn_check_host_wildcard(char *host, char *client_host);
static int rootdn_check_ip_wildcard(char *ip, char *client_ip);
static int rootdn_preop_bind_init(Slapi_PBlock *pb);
char * strToLower(char *str);

/*
 * Plug-in globals
 */
static void *_PluginID = NULL;
static char *_PluginDN = NULL;
static int g_plugin_started = 0;
static int open_time = 0;
static int close_time = 0;
static char *daysAllowed = NULL;
static char **hosts = NULL;
static char **hosts_to_deny = NULL;
static char **ips = NULL;
static char **ips_to_deny = NULL;

static Slapi_PluginDesc pdesc = { ROOTDN_FEATURE_DESC,
                                  VENDOR,
                                  DS_PACKAGE_VERSION,
                                  ROOTDN_PLUGIN_DESC };

/*
 * Plugin identity functions
 */
void
rootdn_set_plugin_id(void *pluginID)
{
    _PluginID = pluginID;
}

void *
rootdn_get_plugin_id()
{
    return _PluginID;
}

void
rootdn_set_plugin_dn(char *pluginDN)
{
    _PluginDN = pluginDN;
}

char *
rootdn_get_plugin_dn()
{
    return _PluginDN;
}


int
rootdn_init(Slapi_PBlock *pb){
    int status = 0;
    char *plugin_identity = NULL;

    slapi_log_error(SLAPI_LOG_TRACE, ROOTDN_PLUGIN_SUBSYSTEM,
                    "--> rootdn_init\n");

    /* Store the plugin identity for later use.  Used for internal operations. */
    slapi_pblock_get(pb, SLAPI_PLUGIN_IDENTITY, &plugin_identity);
    PR_ASSERT(plugin_identity);
    rootdn_set_plugin_id(plugin_identity);

    /* Register callbacks */
    if(slapi_pblock_set(pb, SLAPI_PLUGIN_VERSION, SLAPI_PLUGIN_VERSION_01) != 0 ||
       slapi_pblock_set(pb, SLAPI_PLUGIN_START_FN, (void *) rootdn_start) != 0 ||
       slapi_pblock_set(pb, SLAPI_PLUGIN_DESCRIPTION, (void *) &pdesc) != 0 )
    {
        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_init: failed to register plugin\n");
        status = -1;
    }

    /* for this plugin we don't want to skip over root dn's when binding */
    slapi_set_plugin_open_rootdn_bind(pb);

    if (!status &&
        slapi_register_plugin("internalpreoperation",            /* op type */
                              1,                                 /* Enabled */
                              "rootdn_preop_bind_init", /* this function desc */
                              rootdn_preop_bind_init,   /* init func */
                              ROOTDN_PLUGIN_DESC,                /* plugin desc */
                              NULL,                              /* ? */
                              plugin_identity                    /* access control */
        )) {
        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM,
                        "rootdn_init: failed to register rootdn preoperation plugin\n");
        status = -1;
    }

    /*
     *  Load the config
     */
    if(rootdn_load_config(pb) != 0){
        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM,
            "rootdn_start: unable to load plug-in configuration\n");
        return -1;
    }

    slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM,"<-- rootdn_init\n");
    return status;
}

static int
rootdn_preop_bind_init(Slapi_PBlock *pb)
{
    if(slapi_pblock_set(pb, SLAPI_PLUGIN_INTERNAL_PRE_BIND_FN, (void *) rootdn_check_access) != 0){
        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM,"rootdn_preop_bind_init: "
            "failed to register function\n");
        return -1;
    }

    return 0;
}

static int
rootdn_start(Slapi_PBlock *pb){
    /* Check if we're already started */
    if (g_plugin_started) {
        goto done;
    }

    slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "--> rootdn_start\n");

    g_plugin_started = 1;

    slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "<-- rootdn_start\n");

done:
    return 0;
}

static int
rootdn_load_config(Slapi_PBlock *pb)
{
    Slapi_Entry *e = NULL;
    char *openTime = NULL;
    char *closeTime = NULL;
    char hour[3], min[3];
    int result = 0;
    int i;

    slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "--> rootdn_load_config\n");

    if ((slapi_pblock_get(pb, SLAPI_PLUGIN_CONFIG_ENTRY, &e) == 0) && e){
        /*
         *  Grab our plugin settings
         */
        openTime = slapi_entry_attr_get_charptr(e, "rootdn-open-time");
        closeTime = slapi_entry_attr_get_charptr(e, "rootdn-close-time");
        daysAllowed = slapi_entry_attr_get_charptr(e, "rootdn-days-allowed");
        hosts = slapi_entry_attr_get_charray(e, "rootdn-allow-host");
        hosts_to_deny = slapi_entry_attr_get_charray(e, "rootdn-deny-host");
        ips = slapi_entry_attr_get_charray(e, "rootdn-allow-ip");
        ips_to_deny = slapi_entry_attr_get_charray(e, "rootdn-deny-ip");
        /*
         *  Validate out settings
         */
        if(daysAllowed){
            if(strcspn(daysAllowed, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ,")){
                slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                    "invalid rootdn-days-allowed value (%s), must be all letters, and comma separators\n",closeTime);
                slapi_ch_free_string(&daysAllowed);
                result = -1;
                goto free_and_return;
            }
            daysAllowed = strToLower(daysAllowed);
        }
        if(openTime){
            if (strcspn(openTime, "0123456789")){
                slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                    "invalid rootdn-open-time value (%s), must be all digits\n",openTime);
                result = -1;
                goto free_and_return;
            }
            if(strlen(openTime) != 4){
                slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                    "invalid format for rootdn-open-time value (%s).  Should be HHMM\n", openTime);
                result = -1;
                goto free_and_return;
            }
            /*
             *  convert the time to all seconds
             */
            strncpy(hour, openTime,2);
            strncpy(min, openTime+2,2);
            open_time = (atoi(hour) * 3600) + (atoi(min) * 60);
        }
        if(closeTime){
            if (strcspn(closeTime, "0123456789")){
                slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                    "invalid rootdn-open-time value (%s), must be all digits, and should be HHMM\n",closeTime);
                result = -1;
                goto free_and_return;
            }
            if(strlen(closeTime) != 4){
                slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                    "invalid format for rootdn-open-time value (%s), should be HHMM\n", closeTime);
                result = -1;
                goto free_and_return;
            }
            /*
             *  convert the time to all seconds
             */

            strncpy(hour, closeTime,2);
            strncpy(min, closeTime+2,2);
            close_time = (atoi(hour) * 3600) + (atoi(min) * 60);
        }
        if((openTime && closeTime == NULL) || (openTime == NULL && closeTime)){
            /* If you are using TOD access control, you must have a open and close time */
            slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                "there must be a open and a close time\n");
            slapi_ch_free_string(&closeTime);
            slapi_ch_free_string(&openTime);
            result = -1;
            goto free_and_return;
        }
        if(close_time && open_time && close_time <= open_time){
            /* Make sure the closing time is greater than the open time */
            slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                "the close time must be greater than the open time\n");
            result = -1;
            goto free_and_return;
        }
        if(hosts){
            for(i = 0; hosts[i] != NULL; i++){
                if(strcspn(hosts[i], "0123456789.*-ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")){
                    slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                        "hostname (%s) contians invalid characters, skipping\n",hosts[i]);
                    slapi_ch_free_string(&hosts[i]);
                    hosts[i] = slapi_ch_strdup("!invalid");
                    continue;
                }
            }
        }
        if(hosts_to_deny){
            for(i = 0; hosts_to_deny[i] != NULL; i++){
                if(strcspn(hosts_to_deny[i], "0123456789.*-ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")){
                    slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                        "hostname (%s) contians invalid characters, skipping\n",hosts_to_deny[i]);
                    slapi_ch_free_string(&hosts_to_deny[i]);
                    hosts_to_deny[i] = slapi_ch_strdup("!invalid");
                    continue;
                }
            }
        }
        if(ips){
            for(i = 0; ips[i] != NULL; i++){
                if(strcspn(ips[i], "0123456789:ABCDEFabcdef.*")){
                    slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                        "IP address contains invalid characters (%s), skipping\n", ips[i]);
                    slapi_ch_free_string(&ips[i]);
                    ips[i] = slapi_ch_strdup("!invalid");
                    continue;
                }
                if(strstr(ips[i],":") == 0){
                    /*
                     *  IPv4 - make sure it's just numbers, dots, and wildcard
                     */
                    if(strcspn(ips[i], "0123456789.*")){
                        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                            "IPv4 address contains invalid characters (%s), skipping\n", ips[i]);
                        slapi_ch_free_string(&ips[i]);
                        ips[i] = slapi_ch_strdup("!invalid");
                        continue;
                    }
                }
            }
        }
        if(ips_to_deny){
            for(i = 0; ips_to_deny[i] != NULL; i++){
                if(strcspn(ips_to_deny[i], "0123456789:ABCDEFabcdef.*")){
                    slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                        "IP address contains invalid characters (%s), skipping\n", ips_to_deny[i]);
                    slapi_ch_free_string(&ips_to_deny[i]);
                    ips_to_deny[i] = slapi_ch_strdup("!invalid");
                    continue;
                }
                if(strstr(ips_to_deny[i],":") == 0){
                    /*
                     *  IPv4 - make sure it's just numbers, dots, and wildcard
                     */
                    if(strcspn(ips_to_deny[i], "0123456789.*")){
                        slapi_log_error(SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_load_config: "
                            "IPv4 address contains invalid characters (%s), skipping\n", ips_to_deny[i]);
                        slapi_ch_free_string(&ips_to_deny[i]);
                        ips_to_deny[i] = slapi_ch_strdup("!invalid");
                        continue;
                    }
                }
            }
        }
    } else {
        /* failed to get the plugin entry */
        result = -1;
    }

free_and_return:
    slapi_ch_free_string(&openTime);
    slapi_ch_free_string(&closeTime);

    slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "<-- rootdn_load_config (%d)\n", result);

    return result;
}


static int
rootdn_check_access(Slapi_PBlock *pb){
    PRNetAddr *client_addr = NULL;
    PRHostEnt *host_entry = NULL;
    time_t  curr_time;
    struct tm *timeinfo;
    char *dnsName = NULL;
    int isRoot = 0;
    int rc = 0;
    int i;

    /*
     *  Verify this is a root DN
     */
    slapi_pblock_get ( pb, SLAPI_REQUESTOR_ISROOT, &isRoot );
    if(!isRoot){
    	return 0;
    }
    /*
     *  grab the current time/info if we need it
     */
    if(open_time || daysAllowed){
        time(&curr_time);
        timeinfo = localtime(&curr_time);
    }
    /*
     *  First check TOD restrictions, continue through if we are in the open "window"
     */
    if(open_time){
        int curr_total;

        curr_total = (timeinfo->tm_hour * 3600) + (timeinfo->tm_min * 60);

        if((curr_total < open_time) || (curr_total >= close_time)){
            slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: bind not in the "
                "allowed time window\n");
            return -1;
        }
    }
    /*
     *  Check if today is an allowed day
     */
    if(daysAllowed){
        char *timestr;
        char day[4];
        char *today = day;

        timestr = asctime(timeinfo); // DDD MMM dd hh:mm:ss YYYY
        memmove(day, timestr, 3); // we only want the day
        today = strToLower(today);

        if(!strstr(today, daysAllowed)){
            slapi_log_error(SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: bind not allowed for today\n");
            return -1;
        }
    }
    /*
     *  Check the host restrictions, deny always overrides allow
     */
    if(hosts || hosts_to_deny){
        char buf[PR_NETDB_BUF_SIZE];
        char *host;

        /*
         *  Get the client address
         */
        client_addr = (PRNetAddr *)slapi_ch_malloc(sizeof(PRNetAddr));
        if ( slapi_pblock_get( pb, SLAPI_CONN_CLIENTNETADDR, client_addr ) != 0 ) {
            slapi_log_error( SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: Could not get client address for hosts.\n" );
            rc = -1;
            goto free_and_return;
        }
        /*
         *  Get the hostname from the client address
         */
        host_entry = (PRHostEnt *)slapi_ch_malloc( sizeof(PRHostEnt) );
        if ( PR_GetHostByAddr(client_addr, buf, sizeof(buf), host_entry ) == PR_SUCCESS ) {
            if ( host_entry->h_name != NULL ) {
                /* copy the hostname */
                dnsName = slapi_ch_strdup( host_entry->h_name );
            } else {
                /* no hostname */
                slapi_log_error( SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: client address missing hostname\n");
                rc = -1;
                goto free_and_return;
            }
        } else {
            slapi_log_error( SLAPI_LOG_PLUGIN, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: client IP address could not be resolved\n");
            rc = -1;
            goto free_and_return;
        }
        /*
         *  Now we have our hostname, now do our checks
         */
        if(hosts_to_deny){
            for(i = 0; hosts_to_deny[i] != NULL; i++){
                host = hosts_to_deny[i];
                /* check for wild cards */
                if(host[0] == '*'){
                    if(rootdn_check_host_wildcard(host, dnsName) == 0){
                        /* match, return failure */
                        rc = -1;
                        goto free_and_return;
                    }
                } else {
                    if(strcasecmp(host,dnsName) == 0){
                        /* we have a match, return failure */
                        rc = -1;
                        goto free_and_return;
                    }
                }
            }
            rc = 0;
        }
        if(hosts){
            for(i = 0; hosts[i] != NULL; i++){
                host = hosts[i];
                /* check for wild cards */
                if(host[0] == '*'){
                    if(rootdn_check_host_wildcard(host, dnsName) == 0){
                        /* match */
                        rc = 0;
                        goto free_and_return;
                    }
                } else {
                    if(strcasecmp(host,dnsName) == 0){
                        /* we have a match, */
                        rc = 0;
                        goto free_and_return;
                    }
                }
            }
            rc = -1;
        }
    }
    /*
     *  Check the IP address restrictions, deny always overrides allow
     */
    if(ips || ips_to_deny){
        char ip_str[256];
        char *ip;
        int ip_len, i;

        if(client_addr == NULL){
            client_addr = (PRNetAddr *)slapi_ch_malloc(sizeof(PRNetAddr));
            if ( slapi_pblock_get( pb, SLAPI_CONN_CLIENTNETADDR, client_addr ) != 0 ) {
                slapi_log_error( SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: Could not get client address for IP.\n" );
                rc = -1;
                goto free_and_return;
            }
        }
        /*
         *  Check if we are IPv4, so we can grab the correct IP addr for "ip_str"
         */
        if ( PR_IsNetAddrType( client_addr, PR_IpAddrV4Mapped ) ) {
   	        PRNetAddr v4addr;
   	        memset( &v4addr, 0, sizeof( v4addr ) );
   	        v4addr.inet.family = PR_AF_INET;
   	        v4addr.inet.ip = client_addr->ipv6.ip.pr_s6_addr32[3];
   	        if( PR_NetAddrToString( &v4addr, ip_str, sizeof( ip_str )) != PR_SUCCESS){
   	            slapi_log_error( SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: Could not get IPv4 from client address.\n" );
                rc = -1;
                goto free_and_return;
   	        }
        } else {
            if( PR_NetAddrToString(client_addr, ip_str, sizeof(ip_str)) != PR_SUCCESS){
                slapi_log_error( SLAPI_LOG_FATAL, ROOTDN_PLUGIN_SUBSYSTEM, "rootdn_check_access: Could not get IPv6 from client address.\n" );
                rc = -1;
                goto free_and_return;
            }
        }
        /*
         *  Now we have our IP address, do our checks
         */
        if(ips_to_deny){
            for(i = 0; ips_to_deny[i] != NULL; i++){
                ip = ips_to_deny[i];
                ip_len = strlen(ip);
                if(ip[ip_len - 1] == '*'){
                    if(rootdn_check_ip_wildcard(ips_to_deny[i], ip_str) == 0){
                        /* match, return failure */
                    	rc = -1;
                    	goto free_and_return;
                    }
                } else {
                    if(strcasecmp(ip_str, ip)==0){
                    	/* match, return failure */
                    	rc = -1;
                    	goto free_and_return;
                    }
                }
            }
            rc = 0;
        }
        if(ips){
            for(i = 0; ips[i] != NULL; i++){
                ip = ips[i];
                ip_len = strlen(ip);
                if(ip[ip_len - 1] == '*'){
                    if(rootdn_check_ip_wildcard(ip, ip_str) == 0){
                        /* match, return success */
                        rc = 0;
                        goto free_and_return;
                    }
                } else {
                    if(strcasecmp(ip_str, ip)==0){
                        /* match, return success */
                        rc = 0;
                        goto free_and_return;
                    }
                }
            }
            rc = -1;
        }
    }

free_and_return:
    slapi_ch_free((void **)&client_addr);
    slapi_ch_free((void **)&host_entry);
    slapi_ch_free_string(&dnsName);

    return rc;
}

static int
rootdn_check_host_wildcard(char *host, char *client_host)
{
    int host_len = strlen(host);
    int client_len = strlen(client_host);
    int i, j;
    /*
     *  Start at the end of the string and move backwards, and skip the first char "*"
     */
    if(client_len < host_len){
        /* this can't be a match */
        return -1;
    }
    for(i = host_len - 1, j = client_len - 1; i > 0; i--, j--){
        if(host[i] != client_host[j]){
            return -1;
        }
    }

    return 0;
}

static int
rootdn_check_ip_wildcard(char *ip, char *client_ip)
{
    int ip_len = strlen(ip);
    int i;
    /*
     *  Start at the beginning of the string and move forward, and skip the last char "*"
     */
    if(strlen(client_ip) < ip_len){
        /* this can't be a match */
        return -1;
    }
    for(i = 0; i < ip_len - 1; i++){
        if(ip[i] != client_ip[i]){
            return -1;
        }
    }

    return 0;
}

char *
strToLower(char *str){
    int i;

    for(i = 0; i < strlen(str); i++){
        str[i] = tolower(str[i]);
    }
    return str;
}