Forum Discussion
CirrocumulusGetting basic auth prompt before apm logon page event
Hi
I´ve setup a basic login policy.
Check if client subnet is RFC1918, if yes do ntlm auth, if not go to logon page and do MFA login.
But.. when i access the VIP external i get a basic auth login prompt before the logon page, any tips on where to look?
/Kim
A quick update.
Latest rule is not correct, pasted the wrong one from the clipboard.
Here the latest.
when HTTP_REQUEST {
if { [IP::addr [IP::client_addr] equals "10.0.0.0/8"] or [IP::addr [IP::client_addr] equals "192.168.0.0/16"] or [IP::addr [IP::client_addr] equals "172.16.0.0/12"] } {
if { [ACCESS::session data get session.ntlm.last.result] eq 1 } {
ECA::disable
} else {
ECA::enable
ECA::select select_ntlm:/Common/ntlm_profile
#log local0. "eca enabled"
}
} else {
ECA::disable
#log local0. "RFC1918 ECA disable"
}
}
7 Replies
- Daniel_Wolf
MVP
Hi Kim
First guess - is there an upstream device that might do a NAT and the BIG-IP doesn't see the real client IP address?
There is a old question here, that offers a solution with iRule and XFF headers:
F5 APM - How to do IP Subnet match for IPs in header
KR
kimhenriksenDid a tcpdump and i see the public ip. And i have a http xff profile added.
But I am guessing that the ECA profile applied to the VIP, which i guess will be run first.. I´ll try and add a public ip check in the irule before eca enable.
- Daniel_Wolf
Did you actually check the APM Access Reports for this? This should, given the right log settings are applied, already give you a clue why you get a basic auth prompt instead of the MFA login.
- kimhenriksen
I´ve just checked the default log. But I am applying a new ECA irule, which disables ECA for RFC1918.
As I havent seen anything in the standard reports. So i guess this happens before APM kicks in.
- Daniel_Wolf
Can you share the config / iRule(s) you are using?
Usually, when something seems off with iRules, I try to add logging and take a look at this reference:
It shows iRules HTTP and ACCESS event order.
- kimhenriksen
when HTTP_REQUEST {
if { [ACCESS::session data get session.ntlm.last.result] eq 1 } {
ECA::disable
} else {
ECA::enable
ECA::select select_ntlm:/Common/ntlm_config
}
}
This the one used now, but want to try and change it to this instead.
when HTTP_REQUEST {
if { [IP::addr [IP::client_addr] equals 10.0.0.0/8] or [IP::addr [IP::client_addr] equals 192.168.0.0/16] or [IP::addr [IP::client_addr] equals 172.16.0.0/12] } {
ECA::disable
}
elseif { [ACCESS::session data get session.ntlm.last.result] eq 1 } {
ECA::disable
}
else {
ECA::enable
ECA::select select_ntlm:/Common/ntlm_config
}
}
- kimhenriksen
A quick update.
Latest rule is not correct, pasted the wrong one from the clipboard.
Here the latest.
when HTTP_REQUEST {
if { [IP::addr [IP::client_addr] equals "10.0.0.0/8"] or [IP::addr [IP::client_addr] equals "192.168.0.0/16"] or [IP::addr [IP::client_addr] equals "172.16.0.0/12"] } {
if { [ACCESS::session data get session.ntlm.last.result] eq 1 } {
ECA::disable
} else {
ECA::enable
ECA::select select_ntlm:/Common/ntlm_profile
#log local0. "eca enabled"
}
} else {
ECA::disable
#log local0. "RFC1918 ECA disable"
}
}
