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NetBSD/crypto/dist/heimdal/lib/gssapi/accept_sec_context.c

423 lines
12 KiB
C
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/*
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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 the Institute 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 THE INSTITUTE 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 THE INSTITUTE 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 "gssapi_locl.h"
RCSID("$Id: accept_sec_context.c,v 1.1.1.5 2001/09/17 12:25:00 assar Exp $");
krb5_keytab gssapi_krb5_keytab;
OM_uint32
gsskrb5_register_acceptor_identity (char *identity)
{
krb5_error_code ret;
char *p;
ret = gssapi_krb5_init();
if(ret)
return GSS_S_FAILURE;
if(gssapi_krb5_keytab != NULL) {
krb5_kt_close(gssapi_krb5_context, gssapi_krb5_keytab);
gssapi_krb5_keytab = NULL;
}
asprintf(&p, "FILE:%s", identity);
if(p == NULL)
return GSS_S_FAILURE;
ret = krb5_kt_resolve(gssapi_krb5_context, p, &gssapi_krb5_keytab);
free(p);
if(ret)
return GSS_S_FAILURE;
return GSS_S_COMPLETE;
}
OM_uint32
gss_accept_sec_context
(OM_uint32 * minor_status,
gss_ctx_id_t * context_handle,
const gss_cred_id_t acceptor_cred_handle,
const gss_buffer_t input_token_buffer,
const gss_channel_bindings_t input_chan_bindings,
gss_name_t * src_name,
gss_OID * mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec,
gss_cred_id_t * delegated_cred_handle
)
{
krb5_error_code kret;
OM_uint32 ret;
krb5_data indata;
krb5_flags ap_options;
OM_uint32 flags;
krb5_ticket *ticket = NULL;
krb5_keytab keytab = NULL;
krb5_data fwd_data;
OM_uint32 minor;
ret = 0;
gssapi_krb5_init ();
krb5_data_zero (&fwd_data);
output_token->length = 0;
output_token->value = NULL;
if (*context_handle == GSS_C_NO_CONTEXT) {
*context_handle = malloc(sizeof(**context_handle));
if (*context_handle == GSS_C_NO_CONTEXT) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
}
(*context_handle)->auth_context = NULL;
(*context_handle)->source = NULL;
(*context_handle)->target = NULL;
(*context_handle)->flags = 0;
(*context_handle)->more_flags = 0;
(*context_handle)->ticket = NULL;
if (src_name != NULL)
*src_name = NULL;
kret = krb5_auth_con_init (gssapi_krb5_context,
&(*context_handle)->auth_context);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS
&& input_chan_bindings->application_data.length ==
2 * sizeof((*context_handle)->auth_context->local_port)
) {
/* Port numbers are expected to be in application_data.value,
* initator's port first */
krb5_address initiator_addr, acceptor_addr;
memset(&initiator_addr, 0, sizeof(initiator_addr));
memset(&acceptor_addr, 0, sizeof(acceptor_addr));
(*context_handle)->auth_context->remote_port =
*(int16_t *) input_chan_bindings->application_data.value;
(*context_handle)->auth_context->local_port =
*((int16_t *) input_chan_bindings->application_data.value + 1);
kret = gss_address_to_krb5addr(input_chan_bindings->acceptor_addrtype,
&input_chan_bindings->acceptor_address,
(*context_handle)->auth_context->local_port,
&acceptor_addr);
if (kret) {
gssapi_krb5_set_error_string ();
ret = GSS_S_BAD_BINDINGS;
*minor_status = kret;
goto failure;
}
kret = gss_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
&input_chan_bindings->initiator_address,
(*context_handle)->auth_context->remote_port,
&initiator_addr);
if (kret) {
krb5_free_address (gssapi_krb5_context, &acceptor_addr);
gssapi_krb5_set_error_string ();
ret = GSS_S_BAD_BINDINGS;
*minor_status = kret;
goto failure;
}
kret = krb5_auth_con_setaddrs(gssapi_krb5_context,
(*context_handle)->auth_context,
&acceptor_addr, /* local address */
&initiator_addr); /* remote address */
krb5_free_address (gssapi_krb5_context, &initiator_addr);
krb5_free_address (gssapi_krb5_context, &acceptor_addr);
#if 0
free(input_chan_bindings->application_data.value);
input_chan_bindings->application_data.value = NULL;
input_chan_bindings->application_data.length = 0;
#endif
if (kret) {
gssapi_krb5_set_error_string ();
ret = GSS_S_BAD_BINDINGS;
*minor_status = kret;
goto failure;
}
}
{
int32_t tmp;
krb5_auth_con_getflags(gssapi_krb5_context,
(*context_handle)->auth_context,
&tmp);
tmp |= KRB5_AUTH_CONTEXT_DO_SEQUENCE;
krb5_auth_con_setflags(gssapi_krb5_context,
(*context_handle)->auth_context,
tmp);
}
ret = gssapi_krb5_decapsulate (minor_status,
input_token_buffer,
&indata,
"\x01\x00");
if (ret)
goto failure;
if (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) {
if (gssapi_krb5_keytab != NULL) {
keytab = gssapi_krb5_keytab;
}
} else if (acceptor_cred_handle->keytab != NULL) {
keytab = acceptor_cred_handle->keytab;
}
kret = krb5_rd_req (gssapi_krb5_context,
&(*context_handle)->auth_context,
&indata,
(acceptor_cred_handle == GSS_C_NO_CREDENTIAL) ? NULL
: acceptor_cred_handle->principal,
keytab,
&ap_options,
&ticket);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
kret = krb5_copy_principal (gssapi_krb5_context,
ticket->client,
&(*context_handle)->source);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
kret = krb5_copy_principal (gssapi_krb5_context,
ticket->server,
&(*context_handle)->target);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
if (src_name != NULL) {
kret = krb5_copy_principal (gssapi_krb5_context,
ticket->client,
src_name);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
}
{
krb5_authenticator authenticator;
kret = krb5_auth_con_getauthenticator(gssapi_krb5_context,
(*context_handle)->auth_context,
&authenticator);
if(kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
ret = gssapi_krb5_verify_8003_checksum(minor_status,
input_chan_bindings,
authenticator->cksum,
&flags,
&fwd_data);
krb5_free_authenticator(gssapi_krb5_context, &authenticator);
if (ret)
goto failure;
}
if (fwd_data.length > 0 && (flags & GSS_C_DELEG_FLAG)) {
krb5_ccache ccache;
if (delegated_cred_handle == NULL)
/* XXX Create a new delegated_cred_handle? */
kret = krb5_cc_default (gssapi_krb5_context, &ccache);
else if (*delegated_cred_handle == NULL) {
if ((*delegated_cred_handle =
calloc(1, sizeof(**delegated_cred_handle))) == NULL) {
ret = GSS_S_FAILURE;
*minor_status = ENOMEM;
krb5_set_error_string(gssapi_krb5_context, "out of memory");
gssapi_krb5_set_error_string();
goto failure;
}
if ((ret = gss_duplicate_name(minor_status, ticket->client,
&(*delegated_cred_handle)->principal)) != 0) {
flags &= ~GSS_C_DELEG_FLAG;
free(*delegated_cred_handle);
*delegated_cred_handle = NULL;
goto end_fwd;
}
}
if (delegated_cred_handle != NULL &&
(*delegated_cred_handle)->ccache == NULL) {
kret = krb5_cc_gen_new (gssapi_krb5_context,
&krb5_mcc_ops,
&(*delegated_cred_handle)->ccache);
ccache = (*delegated_cred_handle)->ccache;
}
if (delegated_cred_handle != NULL &&
(*delegated_cred_handle)->mechanisms == NULL) {
ret = gss_create_empty_oid_set(minor_status,
&(*delegated_cred_handle)->mechanisms);
if (ret)
goto failure;
ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
&(*delegated_cred_handle)->mechanisms);
if (ret)
goto failure;
}
if (kret) {
flags &= ~GSS_C_DELEG_FLAG;
goto end_fwd;
}
kret = krb5_cc_initialize(gssapi_krb5_context,
ccache,
*src_name);
if (kret) {
flags &= ~GSS_C_DELEG_FLAG;
goto end_fwd;
}
kret = krb5_rd_cred2(gssapi_krb5_context,
(*context_handle)->auth_context,
ccache,
&fwd_data);
if (kret) {
flags &= ~GSS_C_DELEG_FLAG;
goto end_fwd;
}
end_fwd:
free(fwd_data.data);
}
flags |= GSS_C_TRANS_FLAG;
if (ret_flags)
*ret_flags = flags;
(*context_handle)->flags = flags;
(*context_handle)->more_flags |= OPEN;
if (mech_type)
*mech_type = GSS_KRB5_MECHANISM;
if (time_rec)
*time_rec = GSS_C_INDEFINITE;
if(flags & GSS_C_MUTUAL_FLAG) {
krb5_data outbuf;
kret = krb5_mk_rep (gssapi_krb5_context,
(*context_handle)->auth_context,
&outbuf);
if (kret) {
ret = GSS_S_FAILURE;
*minor_status = kret;
gssapi_krb5_set_error_string ();
goto failure;
}
ret = gssapi_krb5_encapsulate (minor_status,
&outbuf,
output_token,
"\x02\x00");
krb5_data_free (&outbuf);
if (ret)
goto failure;
} else {
output_token->length = 0;
}
(*context_handle)->ticket = ticket;
ticket = NULL;
#if 0
krb5_free_ticket (context, ticket);
#endif
return GSS_S_COMPLETE;
failure:
if (fwd_data.length > 0)
free(fwd_data.data);
if (ticket != NULL)
krb5_free_ticket (gssapi_krb5_context, ticket);
krb5_auth_con_free (gssapi_krb5_context,
(*context_handle)->auth_context);
if((*context_handle)->source)
krb5_free_principal (gssapi_krb5_context,
(*context_handle)->source);
if((*context_handle)->target)
krb5_free_principal (gssapi_krb5_context,
(*context_handle)->target);
free (*context_handle);
if (src_name != NULL) {
gss_release_name (&minor, src_name);
*src_name = NULL;
}
*context_handle = GSS_C_NO_CONTEXT;
return ret;
}
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