freebsd-nq/crypto/heimdal/lib/krb5/expand_hostname.c
Stanislav Sedov ae77177087 - Update FreeBSD Heimdal distribution to version 1.5.1. This also brings
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.
2012-03-22 08:48:42 +00:00

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5.6 KiB
C

/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
static krb5_error_code
copy_hostname(krb5_context context,
const char *orig_hostname,
char **new_hostname)
{
*new_hostname = strdup (orig_hostname);
if (*new_hostname == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
strlwr (*new_hostname);
return 0;
}
/**
* krb5_expand_hostname() tries to make orig_hostname into a more
* canonical one in the newly allocated space returned in
* new_hostname.
* @param context a Keberos context
* @param orig_hostname hostname to canonicalise.
* @param new_hostname output hostname, caller must free hostname with
* krb5_xfree().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_support
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_expand_hostname (krb5_context context,
const char *orig_hostname,
char **new_hostname)
{
struct addrinfo *ai, *a, hints;
int error;
if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
return copy_hostname (context, orig_hostname, new_hostname);
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
if (error)
return copy_hostname (context, orig_hostname, new_hostname);
for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_canonname != NULL) {
*new_hostname = strdup (a->ai_canonname);
freeaddrinfo (ai);
if (*new_hostname == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
} else {
return 0;
}
}
}
freeaddrinfo (ai);
return copy_hostname (context, orig_hostname, new_hostname);
}
/*
* handle the case of the hostname being unresolvable and thus identical
*/
static krb5_error_code
vanilla_hostname (krb5_context context,
const char *orig_hostname,
char **new_hostname,
char ***realms)
{
krb5_error_code ret;
ret = copy_hostname (context, orig_hostname, new_hostname);
if (ret)
return ret;
strlwr (*new_hostname);
ret = krb5_get_host_realm (context, *new_hostname, realms);
if (ret) {
free (*new_hostname);
return ret;
}
return 0;
}
/**
* krb5_expand_hostname_realms() expands orig_hostname to a name we
* believe to be a hostname in newly allocated space in new_hostname
* and return the realms new_hostname is believed to belong to in
* realms.
*
* @param context a Keberos context
* @param orig_hostname hostname to canonicalise.
* @param new_hostname output hostname, caller must free hostname with
* krb5_xfree().
* @param realms output possible realms, is an array that is terminated
* with NULL. Caller must free with krb5_free_host_realm().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_support
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_expand_hostname_realms (krb5_context context,
const char *orig_hostname,
char **new_hostname,
char ***realms)
{
struct addrinfo *ai, *a, hints;
int error;
krb5_error_code ret = 0;
if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
return vanilla_hostname (context, orig_hostname, new_hostname,
realms);
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
if (error)
return vanilla_hostname (context, orig_hostname, new_hostname,
realms);
for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_canonname != NULL) {
ret = copy_hostname (context, a->ai_canonname, new_hostname);
if (ret) {
freeaddrinfo (ai);
return ret;
}
strlwr (*new_hostname);
ret = krb5_get_host_realm (context, *new_hostname, realms);
if (ret == 0) {
freeaddrinfo (ai);
return 0;
}
free (*new_hostname);
}
}
freeaddrinfo(ai);
return vanilla_hostname (context, orig_hostname, new_hostname, realms);
}