520 lines
14 KiB
C
520 lines
14 KiB
C
/*
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* Copyright (c) 1997 - 2001 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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#include "gssapi_locl.h"
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RCSID("$Id: init_sec_context.c,v 1.25 2001/01/30 22:49:56 assar Exp $");
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/*
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* copy the addresses from `input_chan_bindings' (if any) to
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* the auth context `ac'
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*/
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static OM_uint32
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set_addresses (krb5_auth_context ac,
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const gss_channel_bindings_t input_chan_bindings)
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{
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/* Port numbers are expected to be in application_data.value,
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* initator's port first */
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krb5_address initiator_addr, acceptor_addr;
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krb5_error_code kret;
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if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
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|| input_chan_bindings->application_data.length !=
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2 * sizeof(ac->local_port))
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return 0;
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memset(&initiator_addr, 0, sizeof(initiator_addr));
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memset(&acceptor_addr, 0, sizeof(acceptor_addr));
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ac->local_port =
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*(int16_t *) input_chan_bindings->application_data.value;
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ac->remote_port =
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*((int16_t *) input_chan_bindings->application_data.value + 1);
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kret = gss_address_to_krb5addr(input_chan_bindings->acceptor_addrtype,
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&input_chan_bindings->acceptor_address,
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ac->remote_port,
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&acceptor_addr);
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if (kret)
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return kret;
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kret = gss_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
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&input_chan_bindings->initiator_address,
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ac->local_port,
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&initiator_addr);
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if (kret) {
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krb5_free_address (gssapi_krb5_context, &acceptor_addr);
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return kret;
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}
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kret = krb5_auth_con_setaddrs(gssapi_krb5_context,
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ac,
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&initiator_addr, /* local address */
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&acceptor_addr); /* remote address */
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krb5_free_address (gssapi_krb5_context, &initiator_addr);
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krb5_free_address (gssapi_krb5_context, &acceptor_addr);
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#if 0
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free(input_chan_bindings->application_data.value);
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input_chan_bindings->application_data.value = NULL;
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input_chan_bindings->application_data.length = 0;
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#endif
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return kret;
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}
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/*
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* handle delegated creds in init-sec-context
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*/
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static void
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do_delegation (krb5_auth_context ac,
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krb5_ccache ccache,
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krb5_creds *cred,
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const gss_name_t target_name,
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krb5_data *fwd_data,
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int *flags)
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{
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krb5_creds creds;
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krb5_kdc_flags fwd_flags;
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krb5_keyblock *subkey;
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krb5_error_code kret;
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memset (&creds, 0, sizeof(creds));
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krb5_data_zero (fwd_data);
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kret = krb5_generate_subkey (gssapi_krb5_context, &cred->session, &subkey);
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if (kret)
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goto out;
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kret = krb5_auth_con_setlocalsubkey(gssapi_krb5_context, ac, subkey);
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krb5_free_keyblock (gssapi_krb5_context, subkey);
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if (kret)
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goto out;
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kret = krb5_cc_get_principal(gssapi_krb5_context, ccache, &creds.client);
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if (kret)
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goto out;
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kret = krb5_build_principal(gssapi_krb5_context,
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&creds.server,
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strlen(creds.client->realm),
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creds.client->realm,
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KRB5_TGS_NAME,
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creds.client->realm,
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NULL);
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if (kret)
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goto out;
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creds.times.endtime = 0;
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fwd_flags.i = 0;
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fwd_flags.b.forwarded = 1;
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fwd_flags.b.forwardable = 1;
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if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
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target_name->name.name_string.len < 2)
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goto out;
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kret = krb5_get_forwarded_creds(gssapi_krb5_context,
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ac,
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ccache,
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fwd_flags.i,
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target_name->name.name_string.val[1],
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&creds,
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fwd_data);
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out:
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if (kret)
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*flags &= ~GSS_C_DELEG_FLAG;
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else
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*flags |= GSS_C_DELEG_FLAG;
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if (creds.client)
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krb5_free_principal(gssapi_krb5_context, creds.client);
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if (creds.server)
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krb5_free_principal(gssapi_krb5_context, creds.server);
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}
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/*
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* first stage of init-sec-context
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*/
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static OM_uint32
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init_auth
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(OM_uint32 * minor_status,
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const gss_cred_id_t initiator_cred_handle,
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gss_ctx_id_t * context_handle,
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const gss_name_t target_name,
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const gss_OID mech_type,
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OM_uint32 req_flags,
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OM_uint32 time_req,
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const gss_channel_bindings_t input_chan_bindings,
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const gss_buffer_t input_token,
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gss_OID * actual_mech_type,
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gss_buffer_t output_token,
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OM_uint32 * ret_flags,
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OM_uint32 * time_rec
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)
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{
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OM_uint32 ret = GSS_S_FAILURE;
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krb5_error_code kret;
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krb5_flags ap_options;
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krb5_creds this_cred, *cred;
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krb5_data outbuf;
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krb5_ccache ccache;
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u_int32_t flags;
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Authenticator *auth;
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krb5_data authenticator;
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Checksum cksum;
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krb5_enctype enctype;
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krb5_data fwd_data;
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output_token->length = 0;
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output_token->value = NULL;
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krb5_data_zero(&outbuf);
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krb5_data_zero(&fwd_data);
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*minor_status = 0;
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*context_handle = malloc(sizeof(**context_handle));
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if (*context_handle == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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(*context_handle)->auth_context = NULL;
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(*context_handle)->source = NULL;
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(*context_handle)->target = NULL;
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(*context_handle)->flags = 0;
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(*context_handle)->more_flags = 0;
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(*context_handle)->ticket = NULL;
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kret = krb5_auth_con_init (gssapi_krb5_context,
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&(*context_handle)->auth_context);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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kret = set_addresses ((*context_handle)->auth_context,
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input_chan_bindings);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_BAD_BINDINGS;
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goto failure;
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}
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{
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int32_t tmp;
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krb5_auth_con_getflags(gssapi_krb5_context,
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(*context_handle)->auth_context,
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&tmp);
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tmp |= KRB5_AUTH_CONTEXT_DO_SEQUENCE;
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krb5_auth_con_setflags(gssapi_krb5_context,
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(*context_handle)->auth_context,
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tmp);
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}
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if (actual_mech_type)
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*actual_mech_type = GSS_KRB5_MECHANISM;
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if (initiator_cred_handle == GSS_C_NO_CREDENTIAL) {
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kret = krb5_cc_default (gssapi_krb5_context, &ccache);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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} else
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ccache = initiator_cred_handle->ccache;
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kret = krb5_cc_get_principal (gssapi_krb5_context,
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ccache,
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&(*context_handle)->source);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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kret = krb5_copy_principal (gssapi_krb5_context,
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target_name,
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&(*context_handle)->target);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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memset(&this_cred, 0, sizeof(this_cred));
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this_cred.client = (*context_handle)->source;
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this_cred.server = (*context_handle)->target;
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if (time_req) {
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krb5_timestamp ts;
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krb5_timeofday (gssapi_krb5_context, &ts);
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this_cred.times.endtime = ts + time_req;
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} else
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this_cred.times.endtime = 0;
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this_cred.session.keytype = 0;
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kret = krb5_get_credentials (gssapi_krb5_context,
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KRB5_TC_MATCH_KEYTYPE,
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ccache,
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&this_cred,
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&cred);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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krb5_auth_con_setkey(gssapi_krb5_context,
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(*context_handle)->auth_context,
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&cred->session);
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flags = 0;
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ap_options = 0;
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if (req_flags & GSS_C_DELEG_FLAG)
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do_delegation ((*context_handle)->auth_context,
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ccache, cred, target_name, &fwd_data, &flags);
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if (req_flags & GSS_C_MUTUAL_FLAG) {
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flags |= GSS_C_MUTUAL_FLAG;
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ap_options |= AP_OPTS_MUTUAL_REQUIRED;
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}
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if (req_flags & GSS_C_REPLAY_FLAG)
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; /* XXX */
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if (req_flags & GSS_C_SEQUENCE_FLAG)
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; /* XXX */
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if (req_flags & GSS_C_ANON_FLAG)
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; /* XXX */
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flags |= GSS_C_CONF_FLAG;
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flags |= GSS_C_INTEG_FLAG;
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flags |= GSS_C_SEQUENCE_FLAG;
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flags |= GSS_C_TRANS_FLAG;
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if (ret_flags)
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*ret_flags = flags;
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(*context_handle)->flags = flags;
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(*context_handle)->more_flags = LOCAL;
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kret = gssapi_krb5_create_8003_checksum (input_chan_bindings,
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flags,
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&fwd_data,
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&cksum);
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krb5_data_free (&fwd_data);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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#if 1
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enctype = (*context_handle)->auth_context->keyblock->keytype;
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#else
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if ((*context_handle)->auth_context->enctype)
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enctype = (*context_handle)->auth_context->enctype;
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else {
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kret = krb5_keytype_to_enctype(gssapi_krb5_context,
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(*context_handle)->auth_context->keyblock->keytype,
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&enctype);
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if (kret)
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return kret;
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}
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#endif
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kret = krb5_build_authenticator (gssapi_krb5_context,
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(*context_handle)->auth_context,
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enctype,
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cred,
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&cksum,
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&auth,
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&authenticator,
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KRB5_KU_AP_REQ_AUTH);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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kret = krb5_build_ap_req (gssapi_krb5_context,
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enctype,
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cred,
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ap_options,
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authenticator,
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&outbuf);
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if (kret) {
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*minor_status = kret;
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ret = GSS_S_FAILURE;
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goto failure;
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}
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ret = gssapi_krb5_encapsulate (&outbuf, output_token, "\x01\x00");
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if (ret) {
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*minor_status = kret;
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goto failure;
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}
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krb5_data_free (&outbuf);
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if (flags & GSS_C_MUTUAL_FLAG) {
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return GSS_S_CONTINUE_NEEDED;
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} else {
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(*context_handle)->more_flags |= OPEN;
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return GSS_S_COMPLETE;
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}
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failure:
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krb5_auth_con_free (gssapi_krb5_context,
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(*context_handle)->auth_context);
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if((*context_handle)->source)
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krb5_free_principal (gssapi_krb5_context,
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(*context_handle)->source);
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if((*context_handle)->target)
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krb5_free_principal (gssapi_krb5_context,
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(*context_handle)->target);
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free (*context_handle);
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krb5_data_free (&outbuf);
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*context_handle = GSS_C_NO_CONTEXT;
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return ret;
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}
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static OM_uint32
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repl_mutual
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(OM_uint32 * minor_status,
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const gss_cred_id_t initiator_cred_handle,
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gss_ctx_id_t * context_handle,
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const gss_name_t target_name,
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const gss_OID mech_type,
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OM_uint32 req_flags,
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OM_uint32 time_req,
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const gss_channel_bindings_t input_chan_bindings,
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const gss_buffer_t input_token,
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gss_OID * actual_mech_type,
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gss_buffer_t output_token,
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OM_uint32 * ret_flags,
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OM_uint32 * time_rec
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)
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{
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OM_uint32 ret;
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krb5_error_code kret;
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krb5_data indata;
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krb5_ap_rep_enc_part *repl;
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ret = gssapi_krb5_decapsulate (input_token, &indata, "\x02\x00");
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if (ret) {
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/* XXX - Handle AP_ERROR */
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return GSS_S_FAILURE;
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}
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kret = krb5_rd_rep (gssapi_krb5_context,
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(*context_handle)->auth_context,
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&indata,
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&repl);
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if (kret)
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return GSS_S_FAILURE;
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krb5_free_ap_rep_enc_part (gssapi_krb5_context,
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repl);
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output_token->length = 0;
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(*context_handle)->more_flags |= OPEN;
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return GSS_S_COMPLETE;
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}
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/*
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* gss_init_sec_context
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*/
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OM_uint32 gss_init_sec_context
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(OM_uint32 * minor_status,
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const gss_cred_id_t initiator_cred_handle,
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gss_ctx_id_t * context_handle,
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const gss_name_t target_name,
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const gss_OID mech_type,
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OM_uint32 req_flags,
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OM_uint32 time_req,
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const gss_channel_bindings_t input_chan_bindings,
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const gss_buffer_t input_token,
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gss_OID * actual_mech_type,
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gss_buffer_t output_token,
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OM_uint32 * ret_flags,
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OM_uint32 * time_rec
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)
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{
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gssapi_krb5_init ();
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if (input_token == GSS_C_NO_BUFFER || input_token->length == 0)
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return init_auth (minor_status,
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initiator_cred_handle,
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context_handle,
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target_name,
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mech_type,
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req_flags,
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time_req,
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input_chan_bindings,
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input_token,
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actual_mech_type,
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output_token,
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ret_flags,
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time_rec);
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else
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return repl_mutual(minor_status,
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initiator_cred_handle,
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context_handle,
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target_name,
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mech_type,
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req_flags,
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time_req,
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input_chan_bindings,
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input_token,
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actual_mech_type,
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output_token,
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ret_flags,
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time_rec);
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}
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