Re: OpenLDAP client test program connecting to LDAP server over SSL failed

On 08/31/2011 08:23 AM, daisy.wu@emc.com wrote:

Thank you Rich.

extract your CA certificates from /path/to/ldap_certdbto pem file(s) and use those files instead of using the cert/key db.

Do you know if there are existing tools (perhaps already bundled with OpenSSL) that I can run to extract the CA certs to .pem files from /path/to/ldap_certdb?

certutil -d /path/to/ldap_certdb -L # list the certs certutil -d /path/to/ldap_certdb -L -n "name of CA" -a > cacert.pem # extract named CA cert to pem file

Thanks in advance.

Daisy

*From:*Rich Megginson [mailto:rich.megginson@gmail.com] *Sent:* Wednesday, August 31, 2011 6:14 AM *To:* Wu, Daisy *Cc:* richm@stanfordalumni.org; openldap-technical@openldap.org; openldap-devel-request@openldap.org *Subject:* Re: OpenLDAP client test program connecting to LDAP server over SSL failed

On 08/30/2011 11:26 PM, daisy.wu@emc.com mailto:daisy.wu@emc.com wrote:

Thank you so much, Rich, for your reply.

In this call

    char *cert_path="/path/to/ldap_certdb";

    rc = ldap_set_option( ld, LDAP_OPT_X_TLS_CACERTDIR, &cert_path);

    printf("rc=ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTDIR, 

%s)=%d, error=%s\n",

            cert_path, rc, ldap_err2string(rc));

/path/to/ldap_certdbis actually a directory, the files under it are like this:

% ls --altr /path/to/ldap_certdb

total 56

-rw-r--r-- 1 dmadmin dmadmin 16384 Sep 14 2010 secmod.db

-rw-r--r-- 1 dmadmin dmadmin 16384 Sep 14 2010 key3.db

-rw-r--r-- 1 dmadmin dmadmin 16384 Sep 14 2010 cert7.db

drwx------ 27 dmadmin dmadmin 4096 Aug 30 22:14 ../

drwxr-xr-x 2 dmadmin dmadmin 4096 Aug 30 22:14 ./

%

My simple test program (for testing LDAP SSL connection to AD server) using Mozilla LDAP C-SDK looks something like this (this test program works, connecting to AD over SSL works fine):

Right. The reason it works fine is because mozldap uses moznss for crypto - you are using a build of openldap that uses openssl for crypto. You will need to either rebuild openldap to use moznss for crypto, or extract your CA certificates from /path/to/ldap_certdbto pem file(s) and use those files instead of using the cert/key db.

if (ldapssl_client_init("/path/to/ldap_certdb", NULL ) < 0)

{

 perror("ldapssl_client_init");

 return 1;

}

ld = ldapssl_init( host, port, 1);

if ( ld == NULL )

{

  perror("ldapssl_init");

  return 1;

}

if ((rc = ldap_simple_bind_s( ld, bind_dn, bind_password)) != 

LDAP_SUCCESS)

{

  ldap_perror(ld, "ldap_simple_bind_s");

  return 1;

}

However, the following equivalent code using OpenLDAP (built with RSA Share Adpator and RSA MES) does not work. It failed with error "ldap_sasl_bind_s: Can't contact LDAP server (-1) error:14090086:SSL routines: SSL3_GET_SERVER_CERTIFICATE:certificate verify failed"

    ldap_initialize( &ld, uri );

    if ( ld == NULL ) {

            tester_perror( "ldap_initialize", NULL );

            exit( EXIT_FAILURE );

    }

    rc = ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, &version );

    printf("rc=ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, 

%d)=%d, error=%s\n",

            version, rc, ldap_err2string(rc));

    rc = ldap_set_option( ld, LDAP_OPT_REFERRALS,

            chaserefs ? LDAP_OPT_ON : LDAP_OPT_OFF );

    printf("rc=ldap_set_option(ld, LDAP_OPT_REFERRALS, %d)=%d, 

error=%s\n",

            chaserefs, rc, ldap_err2string(rc));

    int debug_flag1 = -1; // LDAP_DEBUG_ANY ;

    rc = ldap_set_option( ld, LDAP_OPT_DEBUG_LEVEL, &debug_flag1);

    printf("rc=ldap_set_option(ld, LDAP_OPT_DEBUG_LEVEL, %d)=%d, 

error=%s\n",

            debug_flag1, rc, ldap_err2string(rc));

    char *cert_path="/path/to/ldap_certdb"; // this is directory

    rc = ldap_set_option( ld, LDAP_OPT_X_TLS_CACERTDIR, &cert_path);

    printf("rc=ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTDIR, 

%s)=%d, error=%s\n",

            cert_path, rc, ldap_err2string(rc));

    int reqcert = LDAP_OPT_X_TLS_ALLOW;

    rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &reqcert);

    printf("rc=ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, 

%d)=%d, error=%s\n",

             reqcert, rc, ldap_err2string(rc));

     rc = ldap_sasl_bind_s( ld, manager, LDAP_SASL_SIMPLE, passwd, 

NULL, NULL, NULL );

     if ( rc != LDAP_SUCCESS ) {

       tester_ldap_error( ld, "ldap_sasl_bind_s", NULL );

       switch ( rc ) {

         case LDAP_BUSY:

         case LDAP_UNAVAILABLE:

           /* fallthru */

         default:

           break;

       }

       exit( EXIT_FAILURE );

     }

*From:*Rich Megginson [mailto:rich.megginson@gmail.com] *Sent:* Tuesday, August 30, 2011 6:27 PM *To:* Wu, Daisy *Cc:* openldap-technical@openldap.org mailto:openldap-technical@openldap.org; openldap-devel-request@openldap.org mailto:openldap-devel-request@openldap.org *Subject:* Re: OpenLDAP client test program connecting to LDAP server over SSL failed

On 08/30/2011 07:09 PM, daisy.wu@emc.com mailto:daisy.wu@emc.com wrote:

I am trying to write a simple client test program using OpenLDAP client API to connect to Microsoft Active Directory Server over SSL.

Below is code snippet. The program failed to connect.

It failed because of this error: ldap_sasl_bind_s: Can't contact LDAP server (-1) error:14090086:SSL routines: SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

I know there's no problem with LDAP certificate store /path/to/ldap_certdb because a simple LDAP client test program written in Mozilla LDAP C-SDK worked fine connecting to this same AD server, over SSL.

I need to know if I am using the correct OpenLDAP client API calls.

Yes, but it looks like you are using OpenLDAP built with openssl, not Mozilla NSS. If your OpenLDAP is provided by some vendor, and you cannot change/rebuild with moznss support, you'll have to export the CA certificate(s) from the /path/to/ldap_certdb and pass them to OpenLDAP with either a single file and LDAP_OPT_X_TLS_CACERTFILE or an openssl style ca cert dir with LDAP_OPT_X_TLS_CACERTDIR.

Any input would be much appreciated.

Thanks.

Source Code:

    ldap_initialize( &ld, uri );

    if ( ld == NULL ) {

            tester_perror( "ldap_initialize", NULL );

            exit( EXIT_FAILURE );

    }

    rc = ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, &version );

    printf("rc=ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, 

%d)=%d, error=%s\n",

            version, rc, ldap_err2string(rc));

    rc = ldap_set_option( ld, LDAP_OPT_REFERRALS,

            chaserefs ? LDAP_OPT_ON : LDAP_OPT_OFF );

    printf("rc=ldap_set_option(ld, LDAP_OPT_REFERRALS, %d)=%d, 

error=%s\n",

            chaserefs, rc, ldap_err2string(rc));

    int debug_flag1 = -1; // LDAP_DEBUG_ANY ;

    rc = ldap_set_option( ld, LDAP_OPT_DEBUG_LEVEL, &debug_flag1);

    printf("rc=ldap_set_option(ld, LDAP_OPT_DEBUG_LEVEL, %d)=%d, 

error=%s\n",

            debug_flag1, rc, ldap_err2string(rc));

    char *cert_path="/path/to/ldap_certdb";

    rc = ldap_set_option( ld, LDAP_OPT_X_TLS_CACERTDIR, &cert_path);

    printf("rc=ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTDIR, 

%s)=%d, error=%s\n",

            cert_path, rc, ldap_err2string(rc));

    int reqcert = LDAP_OPT_X_TLS_ALLOW;

    rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &reqcert);

    printf("rc=ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, 

%d)=%d, error=%s\n",

             reqcert, rc, ldap_err2string(rc));

     rc = ldap_sasl_bind_s( ld, manager, LDAP_SASL_SIMPLE, passwd, 

NULL, NULL, NULL );

     if ( rc != LDAP_SUCCESS ) {

       tester_ldap_error( ld, "ldap_sasl_bind_s", NULL );

       switch ( rc ) {

         case LDAP_BUSY:

         case LDAP_UNAVAILABLE:

           /* fallthru */

         default:

           break;

       }

       exit( EXIT_FAILURE );

     }

Here's program output:

rc=ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, 3)=0, error=Success

rc=ldap_set_option(ld, LDAP_OPT_REFERRALS, 0)=0, error=Success

rc=ldap_set_option(ld, LDAP_OPT_DEBUG_LEVEL, -1)=0, error=Success

rc=ldap_set_option(ld, LDAP_OPT_X_TLS_CACERTDIR, /path/to/ldap_certdb)=0, error=Success

rc=ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, 3)=0, error=Success

PID=4781 - Search(2): base="OU=people,OU=documentum,DC=adldap112,DC=dctmlabs,DC=com", filter="cn=aduser2*" attr="cn".

slapd-search PID=4781: ldap_sasl_bind_s: Can't contact LDAP server (-1) error:14090086:SSL routines: SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

*From:*Wu, Daisy *Sent:* Friday, August 26, 2011 4:53 PM *To:* openldap-technical@openldap.org mailto:openldap-technical@openldap.org; 'openldap-devel-request@openldap.org mailto:openldap-devel-request@openldap.org' *Subject:* Need sample OpenLDAP client test program connecting to LDAP server over SSL

Hi, OpenLDAP developers,

Do you have any sample test programs (or code snippets) that uses OpenLDAP client API to connect to LDAP server over SSL?

Thanks in advance.

Daisy