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[#2096] addressed comments
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Razvan Becheriu
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@ -9,7 +9,9 @@ GSS-TSIG
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.. note::
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This capability is a work in progress.
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The GSS-TSIG feature is considered experimental. It is possible to perform
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the key exchanges and sign the DNS updates using GSS-TSIG, but some error
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handling and fallback scenarios are not covered yet. Use with caution.
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GSS-TSIG Overview
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-----------------
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@ -25,7 +27,8 @@ the Kea DHCP-DDNS (aka D2) server in a premium hook, called `gss_tsig`.
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.. note::
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This library is still in the experimental phase. Use with care!
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This library is still in the experimental phase and is not recommended
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nor supported for use in production. Use with care!
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The GSS-TSIG is defined in `RFC 3645 <https://tools.ietf.org/html/rfc3645>`__.
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The GSS-TSIG protocol itself is an implementation of generic GSS-API v2
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@ -154,9 +157,9 @@ GSS-TSIG capable implementations may work, but were not tested.
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Kerberos 5 Setup
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~~~~~~~~~~~~~~~~
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To be done. One critical detail: there are two kinds of key tables
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(keytab files): the system one used by servers and client tables
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used by clients. For Kerberos 5 Kea is a **client**.
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There are two kinds of key tables (keytab files): the system one used
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by servers and client tables used by clients. For Kerberos 5, Kea is a
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**client**.
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Install the Kerberos 5 client library and kadmin tool:
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@ -164,9 +167,6 @@ Install the Kerberos 5 client library and kadmin tool:
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sudo apt install krb5-kdc krb5-admin-server
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The principals for the DNS server (the service protected by the
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GSS-TSIG TKEY) and for the DNS client must be created.
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The following examples use the ``EXAMPLE.ORG`` realm to demonstrate required
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configuration steps and settings.
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@ -223,29 +223,100 @@ The admin password for the default realm must be set:
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.. code-block:: console
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printf "realm_password\nrealm_password" | krb5_newrealm
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krb5_newrealm
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The DNS server principal (used by the Bind 9 DNS server to provide
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authentication):
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The following message will be displayed and you will be required to type
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the password for the default realm:
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.. code-block:: console
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This script should be run on the master KDC/admin server to initialize
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a Kerberos realm. It will ask you to type in a master key password.
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This password will be used to generate a key that is stored in
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/etc/krb5kdc/stash. You should try to remember this password, but it
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is much more important that it be a strong password than that it be
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remembered. However, if you lose the password and /etc/krb5kdc/stash,
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you cannot decrypt your Kerberos database.
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Loading random data
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Initializing database '/var/lib/krb5kdc/principal' for realm 'EXAMPLE.ORG',
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master key name 'K/M@EXAMPLE.ORG'
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You will be prompted for the database Master Password.
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It is important that you NOT FORGET this password.
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Enter KDC database master key:
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You will be required to retype the password:
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.. code-block:: console
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Re-enter KDC database master key to verify:
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If succesfully applied, the following message will be displayed:
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.. code-block:: console
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Now that your realm is set up you may wish to create an administrative
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principal using the addprinc subcommand of the kadmin.local program.
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Then, this principal can be added to /etc/krb5kdc/kadm5.acl so that
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you can use the kadmin program on other computers. Kerberos admin
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principals usually belong to a single user and end in /admin. For
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example, if jruser is a Kerberos administrator, then in addition to
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the normal jruser principal, a jruser/admin principal should be
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created.
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Don't forget to set up DNS information so your clients can find your
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KDC and admin servers. Doing so is documented in the administration
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guide.
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Next step consists in creating the principals for the Bind9 DNS server
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(the service protected by the GSS-TSIG TKEY) and for the DNS client
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(the Kea DDNS server).
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The Bind9 DNS server principal (used for authentication) is created the
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following way:
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.. code-block:: console
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kadmin.local -q "addprinc -randkey DNS/server.example.org"
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The DNS client principal (used by the Kea DDNS server):
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If succesfully created, the following message will be displayed:
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.. code-block:: console
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kadmin.local -q "addprinc -pw client_princ_password DHCP/admin.example.org"
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No policy specified for DNS/server.example.org@EXAMPLE.ORG; defaulting to no policy
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Authenticating as principal root/admin@EXAMPLE.ORG with password.
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Principal "DNS/server.example.org@EXAMPLE.ORG" created.
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The keytab file for the DNS server principal must be exported so that
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they can be used by the Bind 9 DNS server.
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The exported keytab file name is ``dns.keytab``.
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The DNS client principal (used by the Kea DDNS server) is created the
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following way (please choose your own password here):
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.. code-block:: console
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kadmin.local -q "addprinc -pw <password> DHCP/admin.example.org"
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If succesfully created, the following message will be displayed:
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.. code-block:: console
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No policy specified for DHCP/admin.example.org@EXAMPLE.ORG; defaulting to no policy
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Authenticating as principal root/admin@EXAMPLE.ORG with password.
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Principal "DHCP/admin.example.org@EXAMPLE.ORG" created.
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The DNS server principal must be exported so that it can be used by the Bind 9
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DNS server. Only this principal is required and is is exported to the keytab
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file with the name ``dns.keytab``.
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.. code-block:: console
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kadmin.local -q "ktadd -k /tmp/dns.keytab DNS/server.example.org"
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If succesfully exported, the following message will be displayed:
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.. code-block:: console
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Authenticating as principal root/admin@EXAMPLE.ORG with password.
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Entry for principal DNS/server.example.org with kvno 2, encryption type aes256-cts-hmac-sha1-96 added to keytab WRFILE:/tmp/dns.keytab.
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Entry for principal DNS/server.example.org with kvno 2, encryption type aes128-cts-hmac-sha1-96 added to keytab WRFILE:/tmp/dns.keytab.
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Finally, the krb5-admin-server must be restarted:
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.. code-block:: console
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@ -256,8 +327,8 @@ Bind 9 with GSS-TSIG Configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The Bind 9 DNS server must be configured to use GSS-TSIG and to use the
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previously exported keytab file ``dns.keytab`` by updating the ``named.conf``
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file:
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previously exported DNS server principal from the keytab file ``dns.keytab``.
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Updating the ``named.conf`` file is required:
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.. code-block:: console
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@ -282,7 +353,7 @@ file:
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The zone files should have an entry for the server principal FQDN
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``server.example.org``.
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The ``/etc/bind/db.10`` file:
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The ``/etc/bind/db.10`` file needs to be created or updated:
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.. code-block:: console
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@ -301,7 +372,7 @@ The ``/etc/bind/db.10`` file:
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@ IN NS ns.
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40 IN PTR ns.example.org.
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The ``/var/lib/bind/db.example.org`` file:
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The ``/var/lib/bind/db.example.org`` file needs to be created or updated:
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.. code-block:: console
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@ -124,7 +124,7 @@ Some optional features of Kea have additional dependencies.
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detail in :ref:`netconf-install`. This is an optional dependency; Kea can be
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built without NETCONF support.
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- To sign and verify DNS updates, Kea DDNS server uses GSS-TSIG and requires
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- To sign and verify DNS updates, Kea DDNS server may use GSS-TSIG which requires
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MIT Kerberos 5 or Heimdal libraries. The dependencies required to be
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installed are described in more detail in :ref:`gss-tsig-install`. This is an
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optional dependency; Kea can be built without GSS-TSIG support.
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