/*
   GSS-PROXY

   Copyright (C) 2012 Red Hat, Inc.
   Copyright (C) 2012 Simo Sorce <simo.sorce@redhat.com>

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.
*/

#include "gss_plugin.h"
#include <gssapi/gssapi_krb5.h>

#define KRB5_OID_LEN 9
#define KRB5_OID "\052\206\110\206\367\022\001\002\002"

#define KRB5_OLD_OID_LEN 5
#define KRB5_OLD_OID "\053\005\001\005\002"

/* Incorrect krb5 mech OID emitted by MS. */
#define KRB5_WRONG_OID_LEN 9
#define KRB5_WRONG_OID "\052\206\110\202\367\022\001\002\002"

#define IAKERB_OID_LEN 6
#define IAKERB_OID "\053\006\001\005\002\005"

const gss_OID_desc gpoid_krb5 = {
    .length = KRB5_OID_LEN,
    .elements = KRB5_OID
};
const gss_OID_desc gpoid_krb5_old = {
    .length = KRB5_OLD_OID_LEN,
    .elements = KRB5_OLD_OID
};
const gss_OID_desc gpoid_krb5_wrong = {
    .length = KRB5_WRONG_OID_LEN,
    .elements = KRB5_WRONG_OID
};
const gss_OID_desc gpoid_iakerb = {
    .length = IAKERB_OID_LEN,
    .elements = IAKERB_OID
};

/* 2.16.840.1.113730.3.8.15.1 */
const gss_OID_desc gssproxy_mech_interposer = {
    .length = 11,
    .elements = "\140\206\110\001\206\370\102\003\010\017\001"
};

gss_OID_set gss_mech_interposer(gss_OID mech_type)
{
    gss_OID_set interposed_mechs;
    OM_uint32 maj, min;

    interposed_mechs = NULL;
    maj = 0;
    if (gss_oid_equal(&gssproxy_mech_interposer, mech_type)) {
        maj = gss_create_empty_oid_set(&min, &interposed_mechs);
        if (maj != 0) {
            return NULL;
        }
        maj = gss_add_oid_set_member(&min, no_const(&gpoid_krb5),
                                     &interposed_mechs);
        if (maj != 0) {
            goto done;
        }
        maj = gss_add_oid_set_member(&min, no_const(&gpoid_krb5_old),
                                     &interposed_mechs);
        if (maj != 0) {
            goto done;
        }
        maj = gss_add_oid_set_member(&min, no_const(&gpoid_krb5_wrong),
                                     &interposed_mechs);
        if (maj != 0) {
            goto done;
        }
        maj = gss_add_oid_set_member(&min, no_const(&gpoid_iakerb),
                                     &interposed_mechs);
        if (maj != 0) {
            goto done;
        }
    }

done:
    if (maj != 0) {
        (void)gss_release_oid_set(&min, &interposed_mechs);
        interposed_mechs = NULL;
    }

    return interposed_mechs;
}

/*
gssi_acquire_cred
gssi_release_cred
gssi_init_sec_context
gssi_accept_sec_context
gssi_process_context_token
gssi_delete_sec_context
gssi_context_time
gssi_get_mic
gssi_verify_mic
gssi_wrap
gssi_unwrap
gssi_display_status
gssi_indicate_mechs
gssi_compare_name
gssi_display_name
gssi_import_name
gssi_release_name
gssi_inquire_cred
gssi_add_cred
gssi_export_sec_context
gssi_import_sec_context
gssi_inquire_cred_by_mech
gssi_inquire_names_for_mech
gssi_inquire_context
gssi_internal_release_oid
gssi_wrap_size_limit
gssi_localname
gssi_authorize_localname
gssi_export_name
gssi_duplicate_name
gssi_store_cred
gssi_inquire_sec_context_by_oid
gssi_inquire_cred_by_oid
gssi_set_sec_context_option
gssi_set_cred_option
gssi_mech_invoke
gssi_wrap_aead
gssi_unwrap_aead
gssi_wrap_iov
gssi_unwrap_iov
gssi_wrap_iov_length
gssi_complete_auth_token
gssi_acquire_cred_impersonate_name
gssi_add_cred_impersonate_name
gssi_display_name_ext
gssi_inquire_name
gssi_get_name_attribute
gssi_set_name_attribute
gssi_delete_name_attribute
gssi_export_name_composite
gssi_map_name_to_any
gssi_release_any_name_mapping
gssi_pseudo_random
gssi_set_neg_mechs
gssi_inquire_saslname_for_mech
gssi_inquire_mech_for_saslname
gssi_inquire_attrs_for_mech
*/