366 lines
10 KiB
C
366 lines
10 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: accept_sec_context.c,v 1.21 2001/01/09 18:47:11 assar Exp $");
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static krb5_keytab gss_keytab;
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OM_uint32
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gsskrb5_register_acceptor_identity (char *identity)
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{
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char *p;
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if(gss_keytab != NULL) {
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krb5_kt_close(gssapi_krb5_context, gss_keytab);
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gss_keytab = NULL;
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}
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asprintf(&p, "FILE:%s", identity);
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if(p == NULL)
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return GSS_S_FAILURE;
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krb5_kt_resolve(gssapi_krb5_context, p, &gss_keytab);
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free(p);
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return GSS_S_COMPLETE;
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}
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OM_uint32
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gss_accept_sec_context
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(OM_uint32 * minor_status,
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gss_ctx_id_t * context_handle,
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const gss_cred_id_t acceptor_cred_handle,
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const gss_buffer_t input_token_buffer,
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const gss_channel_bindings_t input_chan_bindings,
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gss_name_t * src_name,
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gss_OID * 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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gss_cred_id_t * delegated_cred_handle
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)
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{
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krb5_error_code kret;
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OM_uint32 ret;
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krb5_data indata;
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krb5_flags ap_options;
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OM_uint32 flags;
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krb5_ticket *ticket = NULL;
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krb5_keytab keytab = NULL;
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krb5_data fwd_data;
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gssapi_krb5_init ();
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krb5_data_zero (&fwd_data);
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output_token->length = 0;
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output_token->value = NULL;
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if (*context_handle == GSS_C_NO_CONTEXT) {
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*context_handle = malloc(sizeof(**context_handle));
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if (*context_handle == GSS_C_NO_CONTEXT) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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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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ret = GSS_S_FAILURE;
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goto failure;
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}
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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((*context_handle)->auth_context->local_port)
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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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memset(&initiator_addr, 0, sizeof(initiator_addr));
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memset(&acceptor_addr, 0, sizeof(acceptor_addr));
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(*context_handle)->auth_context->remote_port =
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*(int16_t *) input_chan_bindings->application_data.value;
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(*context_handle)->auth_context->local_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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(*context_handle)->auth_context->local_port,
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&acceptor_addr);
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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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kret = gss_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
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&input_chan_bindings->initiator_address,
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(*context_handle)->auth_context->remote_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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*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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kret = krb5_auth_con_setaddrs(gssapi_krb5_context,
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(*context_handle)->auth_context,
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&acceptor_addr, /* local address */
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&initiator_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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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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{
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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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ret = gssapi_krb5_decapsulate (input_token_buffer,
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&indata,
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"\x01\x00");
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if (ret) {
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kret = 0;
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goto failure;
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}
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if (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) {
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if (gss_keytab != NULL) {
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keytab = gss_keytab;
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}
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} else if (acceptor_cred_handle->keytab != NULL) {
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keytab = acceptor_cred_handle->keytab;
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}
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kret = krb5_rd_req (gssapi_krb5_context,
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&(*context_handle)->auth_context,
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&indata,
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(acceptor_cred_handle == GSS_C_NO_CREDENTIAL) ? NULL
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: acceptor_cred_handle->principal,
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keytab,
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&ap_options,
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&ticket);
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if (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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ticket->client,
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&(*context_handle)->source);
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if (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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ticket->server,
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&(*context_handle)->target);
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if (kret) {
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ret = GSS_S_FAILURE;
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goto failure;
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}
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if (src_name) {
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kret = krb5_copy_principal (gssapi_krb5_context,
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ticket->client,
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src_name);
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if (kret) {
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ret = GSS_S_FAILURE;
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goto failure;
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}
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}
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{
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krb5_authenticator authenticator;
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kret = krb5_auth_getauthenticator(gssapi_krb5_context,
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(*context_handle)->auth_context,
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&authenticator);
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if(kret) {
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ret = GSS_S_FAILURE;
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goto failure;
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}
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kret = gssapi_krb5_verify_8003_checksum(input_chan_bindings,
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authenticator->cksum,
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&flags,
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&fwd_data);
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krb5_free_authenticator(gssapi_krb5_context, &authenticator);
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if (kret) {
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ret = GSS_S_FAILURE;
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goto failure;
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}
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}
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if (fwd_data.length > 0 && (flags & GSS_C_DELEG_FLAG)) {
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krb5_ccache ccache;
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if (delegated_cred_handle == NULL || *delegated_cred_handle == NULL)
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/* XXX Create a new delegated_cred_handle? */
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kret = krb5_cc_default (gssapi_krb5_context, &ccache);
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else {
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if ((*delegated_cred_handle)->ccache == NULL)
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kret = krb5_cc_gen_new (gssapi_krb5_context,
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&krb5_mcc_ops,
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&(*delegated_cred_handle)->ccache);
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ccache = (*delegated_cred_handle)->ccache;
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}
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if (kret) {
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flags &= ~GSS_C_DELEG_FLAG;
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goto end_fwd;
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}
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kret = krb5_cc_initialize(gssapi_krb5_context,
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ccache,
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*src_name);
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if (kret) {
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flags &= ~GSS_C_DELEG_FLAG;
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goto end_fwd;
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}
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kret = krb5_rd_cred2(gssapi_krb5_context,
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(*context_handle)->auth_context,
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ccache,
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&fwd_data);
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if (kret) {
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flags &= ~GSS_C_DELEG_FLAG;
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goto end_fwd;
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}
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end_fwd:
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free(fwd_data.data);
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}
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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 |= OPEN;
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if (mech_type)
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*mech_type = GSS_KRB5_MECHANISM;
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if (time_rec)
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*time_rec = GSS_C_INDEFINITE;
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if(flags & GSS_C_MUTUAL_FLAG) {
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krb5_data outbuf;
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kret = krb5_mk_rep (gssapi_krb5_context,
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(*context_handle)->auth_context,
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&outbuf);
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if (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,
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output_token,
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"\x02\x00");
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krb5_data_free (&outbuf);
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if (ret) {
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kret = 0;
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goto failure;
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}
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} else {
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output_token->length = 0;
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}
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(*context_handle)->ticket = ticket;
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ticket = NULL;
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#if 0
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krb5_free_ticket (context, ticket);
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#endif
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return GSS_S_COMPLETE;
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failure:
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if (fwd_data.length > 0)
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free(fwd_data.data);
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if (ticket != NULL)
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krb5_free_ticket (gssapi_krb5_context, ticket);
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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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*context_handle = GSS_C_NO_CONTEXT;
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*minor_status = kret;
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return GSS_S_FAILURE;
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}
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