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/*
* Copyright (c) 2021, 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 <krb5_locl.h>
#include <mech_locl.h>
#include "gss-preauth-protos.h"
#include "gss-preauth-private.h"
static krb5_error_code
pa_gss_acquire_initiator_cred(krb5_context context,
krb5_gss_init_ctx gssic,
const krb5_creds *kcred,
gss_cred_id_t *cred)
{
krb5_error_code ret;
OM_uint32 major, minor;
gss_const_OID mech;
gss_OID_set_desc mechs;
gss_name_t initiator_name = GSS_C_NO_NAME;
OM_uint32 time_req;
krb5_timestamp now;
*cred = GSS_C_NO_CREDENTIAL;
mech = _krb5_init_creds_get_gss_mechanism(context, gssic);
mechs.count = 1;
mechs.elements = (gss_OID)mech;
ret = _krb5_gss_pa_unparse_name(context, kcred->client, &initiator_name);
if (ret)
return ret;
krb5_timeofday(context, &now);
if (kcred->times.endtime && kcred->times.endtime > now)
time_req = kcred->times.endtime - now;
else
time_req = GSS_C_INDEFINITE;
major = gss_acquire_cred(&minor, initiator_name, time_req, &mechs,
GSS_C_INITIATE, cred, NULL, NULL);
ret = _krb5_gss_map_error(major, minor);
gss_release_name(&major, &initiator_name);
return ret;
}
static krb5_error_code KRB5_LIB_CALL
pa_gss_step(krb5_context context,
krb5_gss_init_ctx gssic,
const krb5_creds *kcred,
gss_ctx_id_t *ctx,
KDCOptions flags,
krb5_data *enc_as_req,
krb5_data *in,
krb5_data *out)
{
krb5_error_code ret;
krb5_principal tgs_name = NULL;
OM_uint32 major, minor;
gss_cred_id_t cred;
gss_name_t target_name = GSS_C_NO_NAME;
OM_uint32 req_flags = GSS_C_MUTUAL_FLAG;
OM_uint32 ret_flags;
struct gss_channel_bindings_struct cb = { 0 };
gss_buffer_desc input_token, output_token = GSS_C_EMPTY_BUFFER;
krb5_data_zero(out);
if (flags.request_anonymous)
req_flags |= GSS_C_ANON_FLAG;
cred = (gss_cred_id_t)_krb5_init_creds_get_gss_cred(context, gssic);
if (cred == GSS_C_NO_CREDENTIAL) {
ret = pa_gss_acquire_initiator_cred(context, gssic, kcred, &cred);
if (ret)
goto out;
_krb5_init_creds_set_gss_cred(context, gssic, cred);
}
ret = krb5_make_principal(context, &tgs_name, kcred->server->realm,
KRB5_TGS_NAME, kcred->server->realm, NULL);
if (ret)
goto out;
ret = _krb5_gss_pa_unparse_name(context, tgs_name, &target_name);
if (ret)
goto out;
_krb5_gss_data_to_buffer(enc_as_req, &cb.application_data);
_krb5_gss_data_to_buffer(in, &input_token);
major = gss_init_sec_context(&minor,
cred,
ctx,
target_name,
(gss_OID)_krb5_init_creds_get_gss_mechanism(context, gssic),
req_flags,
GSS_C_INDEFINITE,
&cb,
&input_token,
NULL,
&output_token,
&ret_flags,
NULL);
_krb5_gss_buffer_to_data(&output_token, out);
if (major == GSS_S_COMPLETE) {
if ((ret_flags & GSS_C_MUTUAL_FLAG) == 0)
ret = KRB5_MUTUAL_FAILED;
else if ((ret_flags & req_flags) != req_flags)
ret = KRB5KDC_ERR_BADOPTION;
else
ret = 0;
} else
ret = _krb5_gss_map_error(major, minor);
out:
gss_release_name(&minor, &target_name);
krb5_free_principal(context, tgs_name);
return ret;
}
static krb5_error_code KRB5_LIB_CALL
pa_gss_finish(krb5_context context,
krb5_gss_init_ctx gssic,
const krb5_creds *kcred,
gss_ctx_id_t ctx,
krb5int32 nonce,
krb5_enctype enctype,
krb5_principal *client_p,
krb5_keyblock **reply_key_p)
{
krb5_error_code ret;
krb5_principal client = NULL;
krb5_keyblock *reply_key = NULL;
OM_uint32 major, minor;
gss_name_t initiator_name = GSS_C_NO_NAME;
*client_p = NULL;
*reply_key_p = NULL;
major = gss_inquire_context(&minor,
ctx,
&initiator_name,
NULL, /* target_name */
NULL, /* lifetime_req */
NULL, /* mech_type */
NULL, /* ctx_flags */
NULL, /* locally_initiated */
NULL); /* open */
if (GSS_ERROR(major))
return _krb5_gss_map_error(major, minor);
ret = _krb5_gss_pa_parse_name(context, initiator_name, 0, &client);
if (ret)
goto out;
ret = _krb5_gss_pa_derive_key(context, ctx, nonce, enctype, &reply_key);
if (ret)
goto out;
*client_p = client;
client = NULL;
*reply_key_p = reply_key;
reply_key = NULL;
out:
krb5_free_principal(context, client);
if (reply_key)
krb5_free_keyblock(context, reply_key);
gss_release_name(&minor, &initiator_name);
return ret;
}
static void KRB5_LIB_CALL
pa_gss_delete_sec_context(krb5_context context,
krb5_gss_init_ctx gssic,
gss_ctx_id_t ctx)
{
OM_uint32 minor;
gss_delete_sec_context(&minor, &ctx, GSS_C_NO_BUFFER);
}
static void KRB5_LIB_CALL
pa_gss_release_cred(krb5_context context,
krb5_gss_init_ctx gssic,
gss_cred_id_t cred)
{
OM_uint32 minor;
gss_release_cred(&minor, &cred);
}
krb5_error_code
krb5_gss_set_init_creds(krb5_context context,
krb5_init_creds_context ctx,
gss_const_cred_id_t gss_cred,
gss_const_OID gss_mech)
{
return _krb5_init_creds_init_gss(context,ctx,
pa_gss_step,
pa_gss_finish,
pa_gss_release_cred,
pa_gss_delete_sec_context,
gss_cred,
gss_mech,
0);
}
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