Re: Unable to bind LDAP server via SSL

[Dan White <dwhite@olp.net>]

On 06/08/13 07:50 +0530, Ashwin Kumar wrote:
> Hello all, I have written a sample code to connect to LDAP server via SSL
> running on port 10389(ldap) & 10636(ldaps). But the sample application
> fails to set the options for the SSL connection.
> I do not want to verify the certificate correctness at this moment. Can
> someone help fix this sample code??
>
> #include <stdio.h>
> #define LDAP_DEPRECATED 1
> #include <ldap.h>
>
> #define BIND_DN "dc=example,dc=com"
> #define BIND_PW "secret"
>
> int main() {
> LDAP *ld;
> int rc;
> int reqcert = LDAP_OPT_X_TLS_NEVER;
> int version = LDAP_VERSION3;
> int ret(0);
>
> if (ldap_initialize (&ld, "ldap://192.168.1.51:10389";)) {
>        perror("ldap_init"); /* no error here */
>        return(1);
>    }
>    rc  = ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &version);
> if(rc != LDAP_OPT_SUCCESS){
> printf("Setting LDAP_OPT_PROTOCOL_VERSION failed:
> %s\n",ldap_err2string(rc));
> }
>
>    rc = ldap_set_option (ld, LDAP_OPT_X_TLS_REQUIRE_CERT, &reqcert);
> if(rc != LDAP_OPT_SUCCESS){
> printf("Setting LDAP_OPT_X_TLS_REQUIRE_CERT failed:
> %s\n",ldap_err2string(rc));
> }
>
>    rc = ldap_start_tls_s(ld, NULL, NULL);
>    if (rc != LDAP_SUCCESS) {
>        printf("ldap_start_tls failed: %s\n",ldap_err2string(rc));
>    }
>
>    rc = ldap_bind_s(ld, BIND_DN, BIND_PW, LDAP_AUTH_SIMPLE);
>
>    if( rc != LDAP_SUCCESS )
>    {
>        fprintf(stderr, "ldap_simple_bind_s: %s\n", ldap_err2string(rc) );
>        return( 1 );
>    }
>    ldap_unbind(ld);
> }
>
> The program always fails with:
> *Setting LDAP_OPT_X_TLS_REQUIRE_CERT failed: Can't contact LDAP server*
> *ldap_start_tls failed: Not Supported*
>
> The server does support ldaps and ldap+tls. Can some one please help??

Can you connect to the server using any of the OpenLDAP client utilities
(e.g. ldapwhoami) using -Z? start_tls cannot be executed against an
ldaps:// URI, to my knowledge.

What options are you starting your server with, assuming that it's an
OpenLDAP server?

--
Dan White