![]() On its first startup, Samba creates a private key, a self signed certificate and a CA certificate: Using the Samba autogenerated self-signed certificate (default) The secure alternative is NTLM or Kerberos encryption of the LDAP layer using SASL encryption, as this is cryptographically tied the authentication, a MITM relay cannot change the messages. Samba has chosen to simply deny such sessions by default.įor compatibility, the option ldap server require strong auth was introduced, with allow_sasl_over_tls (or no to permit this insecure configuration). Instead, in 2016 with CVE-2016-2112 we recognised the with no cryptographic connection between the NTLM response or Kerberos token and the TLS layer, that a relay attack was possible. ![]() Samba doesn't implement LDAP Channel binding as required by the 2020 LDAP channel binding and LDAP signing requirements for Windows. Tls priority = NORMAL:-VERS-TLS1.0:-VERS-TLS1.1 SASL over TLS: A bad idea This example assumes the library already disables SSLv3, and additionally disables TLS 1.0 and 1.1. GnuTLS controls what ciphers are enabled default but SSLv3 is additionally disabled. The tls priority smb.conf option allows setting a GnuTLS Cipher priority string and so allows disabling of deprecated ciphers. After any changes, you will have to restart Samba. The tls* parameters are set in the section of your smb.conf. LDAPS is controlled by various smb.conf parameters, which all start with tls. When intermediate certificates are used they should be appended to the cert.pem file after the server certificate.BEGIN CERTIFICATE- and -END CERTIFICATE. The files that samba uses have to be in PEM format (Base64-encoded DER).The private key must be accessible without a passphrase, i.e.Supported Samba versions (4.11.0 and later) require GnuTLS so LDAP is available by default. ![]() This document will describe how to enable LDAP over SSL (LDAPS) by installing a certificate in Samba. To secure LDAP traffic, you can use SSL/TLS. By default LDAP connections are unencrypted. 5 Using a custom self-signed certificateĪctive Directory uses the LDAP (Lightweight Directory Access Protocol) for read and write access. ![]() 4 Using the Samba autogenerated self-signed certificate (default).3 Important smb.conf parameters for LDAPS. ![]()
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