1.\" Copyright (c) 2003 Kungliga Tekniska H�gskolan 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: kdc.8,v 1.23.2.1 2003/10/21 20:06:01 lha Exp $ 33.\" 34.Dd October 21, 2003 35.Dt KDC 8 36.Os HEIMDAL 37.Sh NAME 38.Nm kdc 39.Nd Kerberos 5 server 40.Sh SYNOPSIS 41.Nm 42.Oo Fl c Ar file \*(Ba Xo 43.Fl -config-file= Ns Ar file 44.Xc 45.Oc 46.Op Fl p | Fl -no-require-preauth 47.Op Fl -max-request= Ns Ar size 48.Op Fl H | Fl -enable-http 49.Op Fl -no-524 50.Op Fl -kerberos4 51.Op Fl -kerberos4-cross-realm 52.Oo Fl r Ar string \*(Ba Xo 53.Fl -v4-realm= Ns Ar string 54.Xc 55.Oc 56.Op Fl K | Fl -kaserver 57.Oo Fl P Ar portspec \*(Ba Xo 58.Fl -ports= Ns Ar portspec 59.Xc 60.Oc 61.Op Fl -detach 62.Op Fl -addresses= Ns Ar list of addresses 63.Sh DESCRIPTION 64.Nm 65serves requests for tickets. 66When it starts, it first checks the flags passed, any options that are 67not specified with a command line flag are taken from a config file, 68or from a default compiled-in value. 69.Pp 70Options supported: 71.Bl -tag -width Ds 72.It Xo 73.Fl c Ar file , 74.Fl -config-file= Ns Ar file 75.Xc 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 Xo 80.Fl p , 81.Fl -no-require-preauth 82.Xc 83Turn off the requirement for pre-autentication in the initial AS-REQ 84for all principals. 85The use of pre-authentication makes it more difficult to do offline 86password attacks. 87You might want to turn it off if you have clients 88that don't support pre-authentication. 89Since the version 4 protocol doesn't support any pre-authentication, 90serving version 4 clients is just about the same as not requiring 91pre-athentication. 92The default is to require pre-authentication. 93Adding the require-preauth per principal is a more flexible way of 94handling this. 95.It Xo 96.Fl -max-request= Ns Ar size 97.Xc 98Gives an upper limit on the size of the requests that the kdc is 99willing to handle. 100.It Xo 101.Fl H , 102.Fl -enable-http 103.Xc 104Makes the kdc listen on port 80 and handle requests encapsulated in HTTP. 105.It Xo 106.Fl -no-524 107.Xc 108don't respond to 524 requests 109.It Xo 110.Fl -kerberos4 111.Xc 112respond to Kerberos 4 requests 113.It Xo 114.Fl -kerberos4-cross-realm 115.Xc 116respond to Kerberos 4 requests from foreign realms. 117This is a known security hole and should not be enabled unless you 118understand the consequences and are willing to live with them. 119.It Xo 120.Fl r Ar string , 121.Fl -v4-realm= Ns Ar string 122.Xc 123What realm this server should act as when dealing with version 4 124requests. 125The database can contain any number of realms, but since the version 4 126protocol doesn't contain a realm for the server, it must be explicitly 127specified. 128The default is whatever is returned by 129.Fn krb_get_lrealm . 130This option is only availabe if the KDC has been compiled with version 1314 support. 132.It Xo 133.Fl K , 134.Fl -kaserver 135.Xc 136Enable kaserver emulation (in case it's compiled in). 137.It Xo 138.Fl P Ar portspec , 139.Fl -ports= Ns Ar portspec 140.Xc 141Specifies the set of ports the KDC should listen on. 142It is given as a 143white-space separated list of services or port numbers. 144.It Fl -addresses= Ns Ar list of addresses 145The list of addresses to listen for requests on. 146By default, the kdc will listen on all the locally configured 147addresses. 148If only a subset is desired, or the automatic detection fails, this 149option might be used. 150.El 151.Pp 152All activities are logged to one or more destinations, see 153.Xr krb5.conf 5 , 154and 155.Xr krb5_openlog 3 . 156The entity used for logging is 157.Nm kdc . 158.Sh CONFIGURATION FILE 159The configuration file has the same syntax as 160.Xr krb5.conf 5 , 161but will be read before 162.Pa /etc/krb5.conf , 163so it may override settings found there. 164Options specific to the KDC only are found in the 165.Dq [kdc] 166section. 167All the command-line options can preferably be added in the 168configuration file. 169The only difference is the pre-authentication flag, which has to be 170specified as: 171.Pp 172.Dl require-preauth = no 173.Pp 174(in fact you can specify the option as 175.Fl -require-preauth=no ) . 176.Pp 177And there are some configuration options which do not have 178command-line equivalents: 179.Bl -tag -width "xxx" -offset indent 180.It Li check-ticket-addresses = Va boolean 181Check the addresses in the ticket when processing TGS requests. 182The default is FALSE. 183.It Li allow-null-ticket-addresses = Va boolean 184Permit tickets with no addresses. 185This option is only relevant when check-ticket-addresses is TRUE. 186.It Li allow-anonymous = Va boolean 187Permit anonymous tickets with no addresses. 188.It Li enforce-transited-policy = Va boolean 189Always verify the transited policy, ignoring the 190.Va disable-transited-check 191flag if set in the KDC client request. 192.It encode_as_rep_as_tgs_rep = Va boolean 193Encode AS-Rep as TGS-Rep to be bug-compatible with old DCE code. 194The Heimdal clients allow both. 195.It kdc_warn_pwexpire = Va time 196How long before password/principal expiration the KDC should start 197sending out warning messages. 198.El 199.Pp 200The configuration file is only read when the 201.Nm 202is started. 203If changes made to the configuration file are to take effect, the 204.Nm 205needs to be restarted. 206.Pp 207An example of a config file: 208.Bd -literal -offset indent 209[kdc] 210 require-preauth = no 211 v4-realm = FOO.SE 212 key-file = /key-file 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