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/*
* Copyright (c) 2011, PADL Software Pty Ltd.
* 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 PADL Software 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 PADL SOFTWARE 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 PADL SOFTWARE 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 "mech_locl.h"
gss_buffer_desc GSSAPI_LIB_VARIABLE __gss_c_attr_local_login_user = {
sizeof("local-login-user") - 1,
"local-login-user"
};
static OM_uint32
mech_authorize_localname(OM_uint32 *minor_status,
const struct _gss_name *name,
const struct _gss_name *user)
{
OM_uint32 major_status = GSS_S_NAME_NOT_MN;
struct _gss_mechanism_name *mn;
HEIM_TAILQ_FOREACH(mn, &name->gn_mn, gmn_link) {
gssapi_mech_interface m = mn->gmn_mech;
if (m->gm_authorize_localname == NULL) {
major_status = GSS_S_UNAVAILABLE;
continue;
}
major_status = m->gm_authorize_localname(minor_status,
mn->gmn_name,
&user->gn_value,
user->gn_type);
if (major_status != GSS_S_UNAUTHORIZED)
break;
}
return major_status;
}
/*
* Naming extensions based local login authorization.
*/
static OM_uint32
attr_authorize_localname(OM_uint32 *minor_status,
const struct _gss_name *name,
const struct _gss_name *user)
{
OM_uint32 major_status = GSS_S_UNAVAILABLE;
int more = -1;
if (!gss_oid_equal(user->gn_type, GSS_C_NT_USER_NAME))
return GSS_S_BAD_NAMETYPE;
while (more != 0 && major_status != GSS_S_COMPLETE) {
OM_uint32 tmpMajor, tmpMinor;
gss_buffer_desc value;
gss_buffer_desc display_value;
int authenticated = 0, complete = 0;
tmpMajor = gss_get_name_attribute(minor_status,
(gss_name_t)name,
GSS_C_ATTR_LOCAL_LOGIN_USER,
&authenticated,
&complete,
&value,
&display_value,
&more);
if (GSS_ERROR(tmpMajor)) {
major_status = tmpMajor;
break;
}
/* If attribute is present, return an authoritative error code. */
if (authenticated &&
value.length == user->gn_value.length &&
memcmp(value.value, user->gn_value.value, user->gn_value.length) == 0)
major_status = GSS_S_COMPLETE;
else
major_status = GSS_S_UNAUTHORIZED;
gss_release_buffer(&tmpMinor, &value);
gss_release_buffer(&tmpMinor, &display_value);
}
return major_status;
}
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_authorize_localname(OM_uint32 *minor_status,
gss_const_name_t gss_name,
gss_const_name_t gss_user)
{
OM_uint32 major_status;
const struct _gss_name *name = (const struct _gss_name *) gss_name;
const struct _gss_name *user = (const struct _gss_name *) gss_user;
int mechAvailable = 0;
*minor_status = 0;
if (gss_name == GSS_C_NO_NAME || gss_user == GSS_C_NO_NAME)
return GSS_S_CALL_INACCESSIBLE_READ;
/*
* We should check that the user name is not a mechanism name, but
* as Heimdal always calls the mechanism's gss_import_name(), it's
* not possible to make this check.
*/
#if 0
if (HEIM_TAILQ_FIRST(&user->gn_mn) != NULL)
return GSS_S_BAD_NAME;
#endif
/* If mech returns yes, we return yes */
major_status = mech_authorize_localname(minor_status, name, user);
if (major_status == GSS_S_COMPLETE)
return GSS_S_COMPLETE;
else if (major_status != GSS_S_UNAVAILABLE)
mechAvailable = 1;
/* If attribute exists, it is authoritative */
major_status = attr_authorize_localname(minor_status, name, user);
if (major_status == GSS_S_COMPLETE || major_status == GSS_S_UNAUTHORIZED)
return major_status;
/* If mechanism did not implement SPI, compare the local name */
if (mechAvailable == 0) {
int match = 0;
major_status = gss_compare_name(minor_status, gss_name,
gss_user, &match);
if (major_status == GSS_S_COMPLETE && match == 0)
major_status = GSS_S_UNAUTHORIZED;
}
return major_status;
}
GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL
gss_userok(gss_const_name_t name,
const char *user)
{
OM_uint32 major_status, minor_status;
gss_buffer_desc userBuf;
gss_name_t userName;
userBuf.value = (void *)user;
userBuf.length = strlen(user);
major_status = gss_import_name(&minor_status, &userBuf,
GSS_C_NT_USER_NAME, &userName);
if (GSS_ERROR(major_status))
return 0;
major_status = gss_authorize_localname(&minor_status, name, userName);
gss_release_name(&minor_status, &userName);
return (major_status == GSS_S_COMPLETE);
}
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