p4auth_ad-unix-no_null.cpp #1

#include <stdio.h>
#include <stdlib.h>
#include <ldap.h>

#define AUTH_METHOD LDAP_AUTH_SIMPLE
int requested_version = LDAP_VERSION3;

int authCheck( char *host, char *port, char* bind_dn, char* bind_pw);
int main(int argc, char **argv);

main(int argc, char **argv)
{
char oldPassword[128];

    if( argc != 4 )
    {
        printf( "Wrong number of arguments!\n" );
        printf( "Usage:   p4authenticate [IP]     [Port]  [user]\n");
        printf( "Example: p4authenticate  1.2.3.4  389     bob  \n");
        exit( -1 );
    }

    if(strlen(argv[3]) == 0)
    {
      printf("Error:  NULL user names are not allowed.\n");
      exit (-1);
    }

    /* read the password from <stdin> and truncate the newline */

    if( fgets( oldPassword, 128, stdin ) == NULL )
    {
        printf( "Didn't receive old password!\n" );
        exit( -1 );
    }

    oldPassword[ strlen(oldPassword) - 1 ] = '\0';


    if(strlen(oldPassword) == 0)
    {
      printf("Error:  NULL passwords are not allowed.\n");
      exit (-1);
    }


    return( authCheck( argv[1], argv[2], argv[3], oldPassword) );
}

int 
authCheck( char *host, char *port, char* bind_dn, char* bind_pw)
{
LDAP *ld;
int rc;
int portnumber = atoi( port );

    /* Get a handle to an LDAP connection. */

    if( ( ld = ldap_init( host, portnumber ) ) == NULL ) 
    {
        printf( "Can't initialize connection to %s : %d\n" , host, portnumber );
        return( -1 );
    }

    ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, &requested_version );

    /* bind */

    rc = ldap_bind_s( ld, bind_dn, bind_pw, AUTH_METHOD );

    /* check result, report errors */

    if ( rc != LDAP_SUCCESS ) 
    { 

	   if (strcasecmp("Invalid credentials", ldap_err2string(rc)) == 0)
	   {	printf( "Error:  Password incorrect (%s).\n", ldap_err2string(rc) ); }
 	   else
	   {   printf("Error:  %s.\n",ldap_err2string(rc)); }

        return( -1 );
    }

   printf("Success:  Password verified.\n");

    ldap_unbind( ld );
    return( 0 );
}