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| author | Nathaniel McCallum <npmccallum@redhat.com> | 2014-12-05 11:18:55 -0500 |
|---|---|---|
| committer | Martin Kosek <mkosek@redhat.com> | 2014-12-08 10:56:06 +0100 |
| commit | d73ed48cf7fa820b6ff8c46b394ff6da19bc7087 (patch) | |
| tree | 7e43b12e3d8e4dc37459023a96930b127615b3bd | |
| parent | b986eb281d038e871cd613bf5a7a21a1456370cc (diff) | |
| download | freeipa-d73ed48cf7fa820b6ff8c46b394ff6da19bc7087.tar.gz freeipa-d73ed48cf7fa820b6ff8c46b394ff6da19bc7087.tar.xz freeipa-d73ed48cf7fa820b6ff8c46b394ff6da19bc7087.zip | |
Prefer TCP connections to UDP in krb5 clients
In general, TCP is a better fit for FreeIPA due to large packet sizes.
However, there is also a specific need for TCP when using OTP. If a UDP
packet is delivered to the server and the server takes longer to process
it than the client timeout (likely), the OTP value will be resent.
Unfortunately, this will cause failures or even lockouts. Switching to
TCP avoids this problem altogether.
https://fedorahosted.org/freeipa/ticket/4725
Reviewed-By: Martin Kosek <mkosek@redhat.com>
| -rw-r--r-- | install/share/krb5.conf.template | 1 | ||||
| -rwxr-xr-x | install/tools/ipa-replica-conncheck | 1 | ||||
| -rwxr-xr-x | ipa-client/ipa-install/ipa-client-install | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/install/share/krb5.conf.template b/install/share/krb5.conf.template index 7c82083e3..6cb5ee347 100644 --- a/install/share/krb5.conf.template +++ b/install/share/krb5.conf.template @@ -12,6 +12,7 @@ includedir /var/lib/sss/pubconf/krb5.include.d/ rdns = false ticket_lifetime = 24h forwardable = yes + udp_preference_limit = 0 $OTHER_LIBDEFAULTS [realms] $REALM = { diff --git a/install/tools/ipa-replica-conncheck b/install/tools/ipa-replica-conncheck index 88e42bafb..22348fc21 100755 --- a/install/tools/ipa-replica-conncheck +++ b/install/tools/ipa-replica-conncheck @@ -208,6 +208,7 @@ def configure_krb5_conf(realm, kdc, filename): libdefaults.append({'name':'rdns', 'type':'option', 'value':'false'}) libdefaults.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'}) libdefaults.append({'name':'forwardable', 'type':'option', 'value':'yes'}) + libdefaults.append({'name':'udp_preference_limit', 'type':'option', 'value':'0'}) opts.append({'name':'libdefaults', 'type':'section', 'value': libdefaults}) opts.append({'name':'empty', 'type':'empty'}) diff --git a/ipa-client/ipa-install/ipa-client-install b/ipa-client/ipa-install/ipa-client-install index 54a85a7f1..f8825da42 100755 --- a/ipa-client/ipa-install/ipa-client-install +++ b/ipa-client/ipa-install/ipa-client-install @@ -1047,6 +1047,7 @@ def configure_krb5_conf(cli_realm, cli_domain, cli_server, cli_kdc, dnsok, libopts.append({'name':'rdns', 'type':'option', 'value':'false'}) libopts.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'}) libopts.append({'name':'forwardable', 'type':'option', 'value':'yes'}) + libopts.append({'name':'udp_preference_limit', 'type':'option', 'value':'0'}) # Configure KEYRING CCACHE if supported if kernel_keyring.is_persistent_keyring_supported(): |