Minimalistic LDAP proxy (via Simple-Bind) with Base-DN rewrite
Problem this snippet solves: The outlined iRule can be used to access independent LDAP instances behind a single Virtual Server using a single Base-DN. The iRule, will forward LDAP requests to an additional LDAP pool, if the Simple-Bind user account name matches the $static::other_domains list. The iRule would then translate the original Base-DN to the Base-DN matching the additional LDAP instance. Note1: The iRule doesn't adjust ASN.1/BER structures. So the original and changed Base-DN MUST have the same length. You may have to add SPACE paddings to allign the lenght of the Base-DNs. Note2: The iRule wouldn't change the traffic for the default LDAP instance. The traffic is passed through after the Simple-Bind request is completed. Note3: The iRule would translates just the LDAP requests destined to the Base-DN of the additional LDAP instance. The retrived results could then be accessed using their original DNs. Cheers, Kai How to use this snippet: Setup a standard Virtual Server for TCP:386. Apply SNAT and TCP profiles as needed. Assign the default LDAP instance as default_pool. Tweak the RULE_INIT event to match your environment. Code : when RULE_INIT { # # Minimalistic LDAP proxy (via Simple-Bind) with Base-DN rewrite # # Configuration of the other LDAP instance username prefix/suffixes set static::other_domains [list "itacs\\" "@itacs.de"];# List of lower case domain strings # Configuration of the other LDAP instance pool name set static::other_ldap_poolname OTHER_LDAP_POOL_NAME;# Value of the other pool name # Configuration of the Base-DN translation strings # # Important: The Base-DNs MUST have the same lenght. # You have to pad SPACES to match the length # binary scan "OU=xyz,DC=your-domain,DC=tld" H* temp(dn_default) ;# This is the default Base-DN binary scan "OU=f5-team, DC=itacs, DC=de" H* temp(dn_other);# This is the other Base-DN. Pad SPACES to match the length set static::other_base_dn_map [list $temp(dn_default) $temp(dn_other)] unset -nocomplain temp } when CLIENT_ACCEPTED { # TCP session init set session_binding_ldap 1 set session_other_active 0 # Collecting TCP data TCP::collect } when CLIENT_DATA { if { $session_binding_ldap } then { # Searching for simple Bind request to the other LDAP instance set session_binding_ldap 0 foreach temp(domain_string) $static::other_domains { if { [string tolower [TCP::payload]] contains $temp(domain_string) } then { # Forwarding the request to the other LDAP instance set session_other_active 1 pool $static::other_ldap_poolname log -noname local0.debug "LDAP simple bind request for other LDAP instance detected. Forwarding the connection to pool [LB::server pool]" break } } if { $session_other_active == 0 } then { # Forwarding the request to the default LDAP instance log -noname local0.debug "LDAP request for default LDAP instance detected. Forwarding the connection to pool [LB::server pool]" # Releasing TCP data TCP::release unset -nocomplain temp } } if { $session_other_active } then { # Translating Base-DNs for the other LDAP instance binary scan [TCP::payload] H* temp(hex_tcp_payload) set temp(new_tcp_payload) [binary format H* [string map $static::other_base_dn_map $temp(hex_tcp_payload)]] TCP::payload replace 0 [string length [TCP::payload]] $temp(new_tcp_payload) # Releasing TCP data TCP::release # Collecting further TCP data TCP::collect unset -nocomplain temp } } Tested this on version: 12.0Minimalistic LDAP(S) proxy (via Simple-Bind) with Base-DN rewrite
Problem this snippet solves: The outlined iRule can be used to access independent LDAP(S) instances behind a single Virtual Server using a single Base-DN. The iRule, will forward LDAP(S) requests to an additional LDAP(S) pool, if the Simple-Bind user account name matches the $static::other_domains list. The iRule would then translate the original Base-DN to the Base-DN matching the additional LDAP(S) instance. Note1: The iRule doesn't adjust ASN.1/BER structures. So the original and changed Base-DN MUST have the same length. You may have to add SPACE paddings to allign the lenght of the Base-DNs. Note2: The iRule wouldn't change the traffic for the default LDAP(S) instance. The traffic is passed through after the Simple-Bind request is completed. Note3: The iRule would translates just the LDAP requests destined to the Base-DN of the additional LDAP(S) instance. The retrived results could then be accessed using their original DNs. Cheers, Kai How to use this snippet: Setup a standard Virtual Server for TCP:636. Apply SNAT and TCP profiles as needed. Apply client and server side SSL profiles. The server side SSL profile has to support both instances. Assign the default LDAP(S) instance as default_pool. Tweak the RULE_INIT event to match your environment. Code : when RULE_INIT { # # Minimalistic LDAP(S) proxy (via Simple-Bind) with Base-DN rewrite # # Configuration of the other LDAP(S) instance username prefix/suffixes set static::other_domains [list "itacs\\" "@itacs.de"];# List of lower case domain strings # Configuration of the other LDAP(S) instance pool name set static::other_ldaps_poolname OTHER_LDAPS_POOL_NAME;# Value of the other pool name # Configuration of the Base-DN translation strings # # Important: The Base-DNs MUST have the same lenght. # You have to pad SPACES to match the length # binary scan "OU=xyz,DC=your-domain,DC=tld" H* temp(dn_default) ;# This is the default Base-DN binary scan "OU=f5-team, DC=itacs, DC=de" H* temp(dn_other);# This is the other Base-DN. Pad SPACES to match the length set static::other_base_dn_map [list $temp(dn_default) $temp(dn_other)] unset -nocomplain temp } when CLIENTSSL_HANDSHAKE { # SSL session init set session_binding_ldap 1 set session_other_active 0 # Collecting SSL data SSL::collect } when CLIENTSSL_DATA { if { $session_binding_ldap } then { # Searching for simple Bind request to the other LDAP(S) instance set session_binding_ldap 0 foreach temp(domain_string) $static::other_domains { if { [string tolower [SSL::payload]] contains $temp(domain_string) } then { # Forwarding the request to the other LDAP(S) instance set session_other_active 1 pool $static::other_ldaps_poolname log -noname local0.debug "Bind request for other LDAP(S) instance detected. Forwarding the connection to pool [LB::server pool]" break } } if { $session_other_active == 0 } then { # Forwarding the request to the default LDAP(S) instance log -noname local0.debug "LDAPS request for default LDAP(S) instance detected. Forwarding the connection to pool [LB::server pool]" # Releasing SSL data SSL::release unset -nocomplain temp } } if { $session_other_active } then { # Translating Base-DNs for the other LDAP(S) instance binary scan [SSL::payload] H* temp(hex_ssl_payload) set temp(new_ssl_payload) [binary format H* [string map $static::other_base_dn_map $temp(hex_ssl_payload)]] SSL::payload replace 0 [string length [SSL::payload]] $temp(new_ssl_payload) # Releasing SSL data SSL::release # Collecting further SSL data SSL::collect unset -nocomplain temp } } Tested this on version: 12.0
