1.\" Copyright (c) 2003 - 2004 Kungliga Tekniska Högskolan 2.\" (Royal Institute of Technology, Stockholm, Sweden). 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" 3. Neither the name of the Institute nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" $Id$ 33.\" 34.Dd August 24, 2006 35.Dt KDC 8 36.Os HEIMDAL 37.Sh NAME 38.Nm kdc 39.Nd Kerberos 5 server 40.Sh SYNOPSIS 41.Nm 42.Bk -words 43.Oo Fl c Ar file \*(Ba Xo 44.Fl Fl config-file= Ns Ar file 45.Xc 46.Oc 47.Op Fl p | Fl Fl no-require-preauth 48.Op Fl Fl max-request= Ns Ar size 49.Op Fl H | Fl Fl enable-http 50.Op Fl Fl no-524 51.Op Fl Fl kerberos4 52.Op Fl Fl kerberos4-cross-realm 53.Oo Fl r Ar string \*(Ba Xo 54.Fl Fl v4-realm= Ns Ar string 55.Xc 56.Oc 57.Op Fl K | Fl Fl kaserver 58.Oo Fl P Ar portspec \*(Ba Xo 59.Fl Fl ports= Ns Ar portspec 60.Xc 61.Oc 62.Op Fl Fl detach 63.Op Fl Fl disable-des 64.Op Fl Fl addresses= Ns Ar list of addresses 65.Ek 66.Sh DESCRIPTION 67.Nm 68serves requests for tickets. 69When it starts, it first checks the flags passed, any options that are 70not specified with a command line flag are taken from a config file, 71or from a default compiled-in value. 72.Pp 73Options supported: 74.Bl -tag -width Ds 75.It Fl c Ar file , Fl Fl config-file= Ns Ar file 76Specifies the location of the config file, the default is 77.Pa /var/heimdal/kdc.conf . 78This is the only value that can't be specified in the config file. 79.It Fl p , Fl Fl no-require-preauth 80Turn off the requirement for pre-autentication in the initial AS-REQ 81for all principals. 82The use of pre-authentication makes it more difficult to do offline 83password attacks. 84You might want to turn it off if you have clients 85that don't support pre-authentication. 86Since the version 4 protocol doesn't support any pre-authentication, 87serving version 4 clients is just about the same as not requiring 88pre-athentication. 89The default is to require pre-authentication. 90Adding the require-preauth per principal is a more flexible way of 91handling this. 92.It Fl Fl max-request= Ns Ar size 93Gives an upper limit on the size of the requests that the kdc is 94willing to handle. 95.It Fl H , Fl Fl enable-http 96Makes the kdc listen on port 80 and handle requests encapsulated in HTTP. 97.It Fl Fl no-524 98don't respond to 524 requests 99.It Fl Fl kerberos4 100respond to Kerberos 4 requests 101.It Fl Fl kerberos4-cross-realm 102respond to Kerberos 4 requests from foreign realms. 103This is a known security hole and should not be enabled unless you 104understand the consequences and are willing to live with them. 105.It Fl r Ar string , Fl Fl v4-realm= Ns Ar string 106What realm this server should act as when dealing with version 4 107requests. 108The database can contain any number of realms, but since the version 4 109protocol doesn't contain a realm for the server, it must be explicitly 110specified. 111The default is whatever is returned by 112.Fn krb_get_lrealm . 113This option is only available if the KDC has been compiled with version 1144 support. 115.It Fl K , Fl Fl kaserver 116Enable kaserver emulation (in case it's compiled in). 117.It Fl P Ar portspec , Fl Fl ports= Ns Ar portspec 118Specifies the set of ports the KDC should listen on. 119It is given as a 120white-space separated list of services or port numbers. 121.It Fl Fl addresses= Ns Ar list of addresses 122The list of addresses to listen for requests on. 123By default, the kdc will listen on all the locally configured 124addresses. 125If only a subset is desired, or the automatic detection fails, this 126option might be used. 127.It Fl Fl detach 128detach from pty and run as a daemon. 129.It Fl Fl disable-des 130disable add des encryption types, makes the kdc not use them. 131.El 132.Pp 133All activities are logged to one or more destinations, see 134.Xr krb5.conf 5 , 135and 136.Xr krb5_openlog 3 . 137The entity used for logging is 138.Nm kdc . 139.Sh CONFIGURATION FILE 140The configuration file has the same syntax as 141.Xr krb5.conf 5 , 142but will be read before 143.Pa /etc/krb5.conf , 144so it may override settings found there. 145Options specific to the KDC only are found in the 146.Dq [kdc] 147section. 148All the command-line options can preferably be added in the 149configuration file. 150The only difference is the pre-authentication flag, which has to be 151specified as: 152.Pp 153.Dl require-preauth = no 154.Pp 155(in fact you can specify the option as 156.Fl Fl require-preauth=no ) . 157.Pp 158And there are some configuration options which do not have 159command-line equivalents: 160.Bl -tag -width "xxx" -offset indent 161.It Li enable-digest = Va boolean 162turn on support for digest processing in the KDC. 163The default is FALSE. 164.It Li check-ticket-addresses = Va boolean 165Check the addresses in the ticket when processing TGS requests. 166The default is TRUE. 167.It Li allow-null-ticket-addresses = Va boolean 168Permit tickets with no addresses. 169This option is only relevant when check-ticket-addresses is TRUE. 170.It Li allow-anonymous = Va boolean 171Permit anonymous tickets with no addresses. 172.It Li max-kdc-datagram-reply-length = Va number 173Maximum packet size the UDP rely that the KDC will transmit, instead 174the KDC sends back a reply telling the client to use TCP instead. 175.It Li transited-policy = Li always-check \*(Ba \ 176Li allow-per-principal | Li always-honour-request 177This controls how KDC requests with the 178.Li disable-transited-check 179flag are handled. It can be one of: 180.Bl -tag -width "xxx" -offset indent 181.It Li always-check 182Always check transited encoding, this is the default. 183.It Li allow-per-principal 184Currently this is identical to 185.Li always-check . 186In a future release, it will be possible to mark a principal as able 187to handle unchecked requests. 188.It Li always-honour-request 189Always do what the client asked. 190In a future release, it will be possible to force a check per 191principal. 192.El 193.It encode_as_rep_as_tgs_rep = Va boolean 194Encode AS-Rep as TGS-Rep to be bug-compatible with old DCE code. 195The Heimdal clients allow both. 196.It kdc_warn_pwexpire = Va time 197How long before password/principal expiration the KDC should start 198sending out warning messages. 199.El 200.Pp 201The configuration file is only read when the 202.Nm 203is started. 204If changes made to the configuration file are to take effect, the 205.Nm 206needs to be restarted. 207.Pp 208An example of a config file: 209.Bd -literal -offset indent 210[kdc] 211 require-preauth = no 212 v4-realm = FOO.SE 213.Ed 214.Sh BUGS 215If the machine running the KDC has new addresses added to it, the KDC 216will have to be restarted to listen to them. 217The reason it doesn't just listen to wildcarded (like INADDR_ANY) 218addresses, is that the replies has to come from the same address they 219were sent to, and most OS:es doesn't pass this information to the 220application. 221If your normal mode of operation require that you add and remove 222addresses, the best option is probably to listen to a wildcarded TCP 223socket, and make sure your clients use TCP to connect. 224For instance, this will listen to IPv4 TCP port 88 only: 225.Bd -literal -offset indent 226kdc --addresses=0.0.0.0 --ports="88/tcp" 227.Ed 228.Pp 229There should be a way to specify protocol, port, and address triplets, 230not just addresses and protocol, port tuples. 231.Sh SEE ALSO 232.Xr kinit 1 , 233.Xr krb5.conf 5 234