如何解决 ldap_start_tls() “无法启动 TLS:连接错误"在 PHP 中?

I'm getting:

Warning: ldap_start_tls() [function.ldap-start-tls]: Unable to start TLS: Connect error in /var/www/X.php on line Y

/etc/ldap/ldap.conf:

TLS_CACERT     /etc/ssl/certs/ca.crt

ca.crt is the CA which signed the LDAP server certificate. The certificate on the LDAP server is expired and I can't change it.

解决方案

You can ignore the validity in windows by issuing

putenv('LDAPTLS_REQCERT=never');

in your php code. In *nix you need to edit your /etc/ldap.conf to contain

TLS_REQCERT never

Another thing to be aware of is that it requires version 3 (version 2 is php default):

//$hostnameSSL example would be "ldaps://just.example.com:636" , just make sure it has ldaps://
$con = ldap_connect($hostnameSSL);
ldap_set_option($con, LDAP_OPT_PROTOCOL_VERSION, 3);

To get a better idea of what's going on, you can enable debug logging by:

ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);

This can be done before the ldap_connect takes place.