[Freeipa-users] IPA port 80

Thu Sep 1 13:47:09 UTC 2016

Sean Hogan wrote:
> Thanks Peter,
>
>
> So the set up is each vlan has an IPA replica within the firewall
> boundary acting as its primary auth/policy server. If it goes down..
> then the clients can reach back thru the firewall to our backup IPAs. So
> I am trying to pinpoint the actual ports required to be open on the
> firewall to allow the clients the ability to get back to the back up IPAs.
>
> It comes down to opening ports thru the firewalls back to our IPA backup
> servers. If port 80 is not required for the clients or servers to get to
> IPA behind the firewall then there is no need in opening more ports than
> required and getting 443 open adheres more to our security policy than
> 80. So if everything is redirected to 443 and 80 is not required as it
> is all redirected then the docs I am using are not correct.
>
> I am hoping Simo can weigh in on this

Peter is right about OCSP/CRL. If you don't need them, and don't want a 
user-friendly redirect if your users don't specify https then yeah, you 
can probably do without port 80, assuming none of your clients REQUIRE 
an OCSP response (e.g. security.OCSP.require in Firefox, false by default).

Another, rarely used path for port 80 is retrieval of the CA certificate 
when enrolling clients. Normally it is retrieved over authenticated LDAP 
but if that fails, and one isn't pre-positioned, it will fall back to 
trying to get it over port 80 (last because this isn't exactly safe).

rob

>
>
> Redhat link shows this for firewall port openings
> _https://access.redhat.com/solutions/357673_
> with <-> seeming to indicate bidirectional. Not sure why NTP requires
> that for the clients.
>
> *Resolution**
> IdM Server <-> Clients*
> *Name*
> 	
> *Destination-port / Type*
> 	
> *Purpose*
> HTTP/HTTPS 	80 / 443 TCP 	WebUI and IPA CLI admin tools communication.
> LDAP/LDAPS	389 / 636 TCP 	directory service communication.
> Kerberos 	88 / 464 TCP and UDP	communication for authentication
> DNS 	53 TCP and UDP 	nameservice, used also for autodiscovery,
> autoregistration and High Availability Authentication(sssd), optional
> NTP 	123 UDP 	network time protocol, optional
> kadmind 	464 / 749 TCP 	used for principal generation, password changes etc.
>
> *
> IdM Server <-> IdM Server (i.e. Replica)*
> *Name*
> 	
> *Destination-port/Type*
> 	
> *Purpose*
> HTTP/HTTPS 	80 / 443 TCP 	WebUI and IPA CLI admin tools communication.
> LDAP/LDAPS	389 / 636 TCP 	directory service communication.
> Kerberos 	88 / 464 TCP and UDP	communication for authentication
> DNS 	53 / TCP and UDP 	nameservice, used also for autodiscovery,
> autoregistration and High Availability Authentication(sssd), *optional*
> NTP 	123 UDP 	network time protocol, *optional*
> kadmind 	464 / 749 TCP 	used only via localhost
> dogtag 	7389 TCP 	Server and replica communication
> replica conf	9443 / 9444 / 9445 TCP	Recplica configuration, only needed
> during initial replica installation -- IPAv3/RHEL6 only (not required at
> all in IPAv4/RHEL7)
>
> *Note:* In RHEL 7, 389 port is used for replication instead of 7389 port.
>
>
> Sean Hogan
>
>
>
>
>
> Inactive hide details for Peter Fern ---08/31/2016 04:01:30 PM---You
> need to serve CRLs and OCSP via HTTP to avoid clients failPeter Fern
> ---08/31/2016 04:01:30 PM---You need to serve CRLs and OCSP via HTTP to
> avoid clients failing to verify the cert of the host ser
>
> From: Peter Fern <freeipa at 0xc0dedbad.com>
> To: freeipa-users <freeipa-users at redhat.com>
> Date: 08/31/2016 04:01 PM
> Subject: Re: [Freeipa-users] IPA port 80
> Sent by: freeipa-users-bounces at redhat.com
>
> ------------------------------------------------------------------------
>
>
>
> You need to serve CRLs and OCSP via HTTP to avoid clients failing to
> verify the cert of the host serving the CRL/OCSP when the cert on that
> host needs to be verified at itself.
>
> I'm not sure why you'd particularly care though - reading the Apache
> configs and you should see that other than a couple of exceptions, all
> HTTP traffic is redirected to HTTPS.
>
> On 01/09/16 07:22, Sean Hogan wrote:
>
>         Hi all,
>
>         Been reading a lot about Port 80 for IPA and firewalls but have
>         not found a concrete answer. I know the redhat docs indicate
>         port 80 is required bidirectional however I need to investigate
>         if it is truly needed.
>
>         GUI only responds to 443 so not sure what else would be
>         utilizing port 80. I have seen some references that dogtag
>         proxies its ports to 80 and 443 but if the gui is running on 443
>         does that mean dogtag is proxying via 443 only? Or is there a
>         way to tell? Has anyone attempted not opening port 80 from IPA
>         Server to IPA Server and clients to IPA server?
>         ipa-server-3.0.0-50.el6.1.x86_64
>
>
>
>
>         Sean Hogan
>
>
>
>
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>
>
>