e7e0b34988
several new kerberos related libraries and applications to FreeBSD:
o kgetcred(1) allows one to manually get a ticket for a particular service.
o kf(1) securily forwards ticket to another host through an authenticated
and encrypted stream.
o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1)
and other user kerberos operations. klist and kswitch are just symlinks
to kcc(1) now.
o kswitch(1) allows you to easily switch between kerberos credentials if
you're running KCM.
o hxtool(1) is a certificate management tool to use with PKINIT.
o string2key(1) maps a password into key.
o kdigest(8) is a userland tool to access the KDC's digest interface.
o kimpersonate(8) creates a "fake" ticket for a service.
We also now install manpages for some lirbaries that were not installed
before, libheimntlm and libhx509.
- The new HEIMDAL version no longer supports Kerberos 4. All users are
recommended to switch to Kerberos 5.
- Weak ciphers are now disabled by default. To enable DES support (used
by telnet(8)), use "allow_weak_crypto" option in krb5.conf.
- libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings
disabled due to the function they use (krb5_get_err_text(3)) being
deprecated. I plan to work on this next.
- Heimdal's KDC now require sqlite to operate. We use the bundled version
and install it as libheimsqlite. If some other FreeBSD components will
require it in the future we can rename it to libbsdsqlite and use for these
components as well.
- This is not a latest Heimdal version, the new one was released while I was
working on the update. I will update it to 1.5.2 soon, as it fixes some
important bugs and security issues.
225 lines
7.0 KiB
Groff
225 lines
7.0 KiB
Groff
.\" Copyright (c) 1997-2003 Kungliga Tekniska Högskolan
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.\" (Royal Institute of Technology, Stockholm, Sweden).
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" 3. Neither the name of the Institute nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd September 3, 2003
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.Dt KRB5_425_CONV_PRINCIPAL 3
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.Os HEIMDAL
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.Sh NAME
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.Nm krb5_425_conv_principal ,
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.Nm krb5_425_conv_principal_ext ,
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.Nm krb5_524_conv_principal
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.Nd converts to and from version 4 principals
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.Sh LIBRARY
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Kerberos 5 Library (libkrb5, -lkrb5)
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.Sh SYNOPSIS
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.In krb5.h
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.Ft krb5_error_code
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.Fn krb5_425_conv_principal "krb5_context context" "const char *name" "const char *instance" "const char *realm" "krb5_principal *principal"
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.Ft krb5_error_code
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.Fn krb5_425_conv_principal_ext "krb5_context context" "const char *name" "const char *instance" "const char *realm" "krb5_boolean (*func)(krb5_context, krb5_principal)" "krb5_boolean resolve" "krb5_principal *principal"
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.Ft krb5_error_code
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.Fn krb5_524_conv_principal "krb5_context context" "const krb5_principal principal" "char *name" "char *instance" "char *realm"
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.Sh DESCRIPTION
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Converting between version 4 and version 5 principals can at best be
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described as a mess.
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.Pp
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A version 4 principal consists of a name, an instance, and a realm. A
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version 5 principal consists of one or more components, and a
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realm. In some cases also the first component/name will differ between
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version 4 and version 5. Furthermore the second component of a host
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principal will be the fully qualified domain name of the host in
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question, while the instance of a version 4 principal will only
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contain the first part (short hostname). Because of these problems
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the conversion between principals will have to be site customized.
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.Pp
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.Fn krb5_425_conv_principal_ext
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will try to convert a version 4 principal, given by
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.Fa name ,
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.Fa instance ,
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and
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.Fa realm ,
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to a version 5 principal. This can result in several possible
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principals, and if
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.Fa func
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is non-NULL, it will be called for each candidate principal.
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.Fa func
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should return true if the principal was
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.Dq good .
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To accomplish this,
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.Fn krb5_425_conv_principal_ext
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will look up the name in
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.Pa krb5.conf .
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It first looks in the
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.Li v4_name_convert/host
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subsection, which should contain a list of version 4 names whose
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instance should be treated as a hostname. This list can be specified
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for each realm (in the
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.Li realms
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section), or in the
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.Li libdefaults
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section. If the name is found the resulting name of the principal
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will be the value of this binding. The instance is then first looked
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up in
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.Li v4_instance_convert
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for the specified realm. If found the resulting value will be used as
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instance (this can be used for special cases), no further attempts
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will be made to find a conversion if this fails (with
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.Fa func ) .
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If the
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.Fa resolve
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parameter is true, the instance will be looked up with
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.Fn gethostbyname .
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This can be a time consuming, error prone, and unsafe operation. Next
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a list of hostnames will be created from the instance and the
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.Li v4_domains
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variable, which should contain a list of possible domains for the
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specific realm.
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.Pp
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On the other hand, if the name is not found in a
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.Li host
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section, it is looked up in a
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.Li v4_name_convert/plain
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binding. If found here the name will be converted, but the instance
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will be untouched.
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.Pp
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This list of default host-type conversions is compiled-in:
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.Bd -literal -offset indent
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v4_name_convert = {
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host = {
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ftp = ftp
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hprop = hprop
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imap = imap
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pop = pop
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rcmd = host
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smtp = smtp
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}
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}
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.Ed
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.Pp
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It will only be used if there isn't an entry for these names in the
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config file, so you can override these defaults.
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.Pp
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.Fn krb5_425_conv_principal
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will call
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.Fn krb5_425_conv_principal_ext
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with
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.Dv NULL
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as
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.Fa func ,
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and the value of
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.Li v4_instance_resolve
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(from the
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.Li libdefaults
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section) as
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.Fa resolve .
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.Pp
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.Fn krb5_524_conv_principal
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basically does the opposite of
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.Fn krb5_425_conv_principal ,
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it just doesn't have to look up any names, but will instead truncate
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instances found to belong to a host principal. The
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.Fa name ,
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.Fa instance ,
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and
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.Fa realm
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should be at least 40 characters long.
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.Sh EXAMPLES
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Since this is confusing an example is in place.
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.Pp
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Assume that we have the
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.Dq foo.com ,
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and
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.Dq bar.com
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domains that have shared a single version 4 realm, FOO.COM. The version 4
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.Pa krb.realms
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file looked like:
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.Bd -literal -offset indent
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foo.com FOO.COM
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\&.foo.com FOO.COM
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\&.bar.com FOO.COM
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.Ed
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.Pp
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A
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.Pa krb5.conf
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file that covers this case might look like:
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.Bd -literal -offset indent
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[libdefaults]
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v4_instance_resolve = yes
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[realms]
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FOO.COM = {
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kdc = kerberos.foo.com
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v4_instance_convert = {
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foo = foo.com
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}
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v4_domains = foo.com
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}
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.Ed
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.Pp
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With this setup and the following host table:
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.Bd -literal -offset indent
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foo.com
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a-host.foo.com
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b-host.bar.com
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.Ed
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the following conversions will be made:
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.Bd -literal -offset indent
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rcmd.a-host -\*(Gt host/a-host.foo.com
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ftp.b-host -\*(Gt ftp/b-host.bar.com
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pop.foo -\*(Gt pop/foo.com
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ftp.other -\*(Gt ftp/other.foo.com
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other.a-host -\*(Gt other/a-host
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.Ed
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.Pp
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The first three are what you expect. If you remove the
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.Dq v4_domains ,
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the fourth entry will result in an error (since the host
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.Dq other
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can't be found). Even if
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.Dq a-host
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is a valid host name, the last entry will not be converted, since the
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.Dq other
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name is not known to represent a host-type principal.
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If you turn off
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.Dq v4_instance_resolve
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the second example will result in
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.Dq ftp/b-host.foo.com
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(because of the default domain). And all of this is of course only
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valid if you have working name resolving.
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.Sh SEE ALSO
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.Xr krb5_build_principal 3 ,
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.Xr krb5_free_principal 3 ,
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.Xr krb5_parse_name 3 ,
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.Xr krb5_sname_to_principal 3 ,
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.Xr krb5_unparse_name 3 ,
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.Xr krb5.conf 5
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