Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/crypto/dist/heimdal/lib/gssapi/init_sec_context.c

580 lines
15 KiB
C
Raw Blame History

/*
* Copyright (c) 1997 - 2003 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("$Heimdal: init_sec_context.c,v 1.36.2.1 2003/08/15 14:21:18 lha Exp $"
"$NetBSD: init_sec_context.c,v 1.11 2004/04/02 14:59:48 lha Exp $");
/*
* copy the addresses from `input_chan_bindings' (if any) to
* the auth context `ac'
*/
static OM_uint32
set_addresses (krb5_auth_context ac,
const gss_channel_bindings_t input_chan_bindings)
{
/* Port numbers are expected to be in application_data.value,
* initator's port first */
krb5_address initiator_addr, acceptor_addr;
krb5_error_code kret;
if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
|| input_chan_bindings->application_data.length !=
2 * sizeof(ac->local_port))
return 0;
memset(&initiator_addr, 0, sizeof(initiator_addr));
memset(&acceptor_addr, 0, sizeof(acceptor_addr));
ac->local_port =
*(int16_t *) input_chan_bindings->application_data.value;
ac->remote_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,
ac->remote_port,
&acceptor_addr);
if (kret)
return kret;
kret = gss_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
&input_chan_bindings->initiator_address,
ac->local_port,
&initiator_addr);
if (kret) {
krb5_free_address (gssapi_krb5_context, &acceptor_addr);
return kret;
}
kret = krb5_auth_con_setaddrs(gssapi_krb5_context,
ac,
&initiator_addr, /* local address */
&acceptor_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
return kret;
}
/*
* handle delegated creds in init-sec-context
*/
static void
do_delegation (krb5_auth_context ac,
krb5_ccache ccache,
krb5_creds *cred,
const gss_name_t target_name,
krb5_data *fwd_data,
int *flags)
{
krb5_creds creds;
krb5_kdc_flags fwd_flags;
krb5_error_code kret;
memset (&creds, 0, sizeof(creds));
krb5_data_zero (fwd_data);
kret = krb5_cc_get_principal(gssapi_krb5_context, ccache, &creds.client);
if (kret)
goto out;
kret = krb5_build_principal(gssapi_krb5_context,
&creds.server,
strlen(creds.client->realm),
creds.client->realm,
KRB5_TGS_NAME,
creds.client->realm,
NULL);
if (kret)
goto out;
creds.times.endtime = 0;
fwd_flags.i = 0;
fwd_flags.b.forwarded = 1;
fwd_flags.b.forwardable = 1;
if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
target_name->name.name_string.len < 2)
goto out;
kret = krb5_get_forwarded_creds(gssapi_krb5_context,
ac,
ccache,
fwd_flags.i,
target_name->name.name_string.val[1],
&creds,
fwd_data);
out:
if (kret)
*flags &= ~GSS_C_DELEG_FLAG;
else
*flags |= GSS_C_DELEG_FLAG;
if (creds.client)
krb5_free_principal(gssapi_krb5_context, creds.client);
if (creds.server)
krb5_free_principal(gssapi_krb5_context, creds.server);
}
/*
* first stage of init-sec-context
*/
static OM_uint32
init_auth
(OM_uint32 * minor_status,
const gss_cred_id_t initiator_cred_handle,
gss_ctx_id_t * context_handle,
const gss_name_t target_name,
const gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
const gss_channel_bindings_t input_chan_bindings,
const gss_buffer_t input_token,
gss_OID * actual_mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec
)
{
OM_uint32 ret = GSS_S_FAILURE;
krb5_error_code kret;
krb5_flags ap_options;
krb5_creds this_cred, *cred;
krb5_data outbuf;
krb5_ccache ccache;
u_int32_t flags;
Authenticator *auth;
krb5_data authenticator;
Checksum cksum;
krb5_enctype enctype;
krb5_data fwd_data;
OM_uint32 lifetime_rec;
krb5_data_zero(&outbuf);
krb5_data_zero(&fwd_data);
*minor_status = 0;
*context_handle = malloc(sizeof(**context_handle));
if (*context_handle == NULL) {
*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;
(*context_handle)->lifetime = GSS_C_INDEFINITE;
kret = krb5_auth_con_init (gssapi_krb5_context,
&(*context_handle)->auth_context);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
kret = set_addresses ((*context_handle)->auth_context,
input_chan_bindings);
if (kret) {
*minor_status = kret;
ret = GSS_S_BAD_BINDINGS;
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);
}
if (actual_mech_type)
*actual_mech_type = GSS_KRB5_MECHANISM;
if (initiator_cred_handle == GSS_C_NO_CREDENTIAL) {
kret = krb5_cc_default (gssapi_krb5_context, &ccache);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
} else
ccache = initiator_cred_handle->ccache;
kret = krb5_cc_get_principal (gssapi_krb5_context,
ccache,
&(*context_handle)->source);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
kret = krb5_copy_principal (gssapi_krb5_context,
target_name,
&(*context_handle)->target);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
ret = _gss_DES3_get_mic_compat(minor_status, *context_handle);
if (ret)
goto failure;
memset(&this_cred, 0, sizeof(this_cred));
this_cred.client = (*context_handle)->source;
this_cred.server = (*context_handle)->target;
if (time_req && time_req != GSS_C_INDEFINITE) {
krb5_timestamp ts;
krb5_timeofday (gssapi_krb5_context, &ts);
this_cred.times.endtime = ts + time_req;
} else
this_cred.times.endtime = 0;
this_cred.session.keytype = 0;
kret = krb5_get_credentials (gssapi_krb5_context,
KRB5_TC_MATCH_KEYTYPE,
ccache,
&this_cred,
&cred);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
(*context_handle)->lifetime = cred->times.endtime;
ret = gssapi_lifetime_left(minor_status,
(*context_handle)->lifetime,
&lifetime_rec);
if (ret) {
goto failure;
}
if (lifetime_rec == 0) {
*minor_status = 0;
ret = GSS_S_CONTEXT_EXPIRED;
goto failure;
}
krb5_auth_con_setkey(gssapi_krb5_context,
(*context_handle)->auth_context,
&cred->session);
kret = krb5_auth_con_generatelocalsubkey(gssapi_krb5_context,
(*context_handle)->auth_context,
&cred->session);
if(kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
flags = 0;
ap_options = 0;
if (req_flags & GSS_C_DELEG_FLAG)
do_delegation ((*context_handle)->auth_context,
ccache, cred, target_name, &fwd_data, &flags);
if (req_flags & GSS_C_MUTUAL_FLAG) {
flags |= GSS_C_MUTUAL_FLAG;
ap_options |= AP_OPTS_MUTUAL_REQUIRED;
}
if (req_flags & GSS_C_REPLAY_FLAG)
; /* XXX */
if (req_flags & GSS_C_SEQUENCE_FLAG)
; /* XXX */
if (req_flags & GSS_C_ANON_FLAG)
; /* XXX */
flags |= GSS_C_CONF_FLAG;
flags |= GSS_C_INTEG_FLAG;
flags |= GSS_C_SEQUENCE_FLAG;
flags |= GSS_C_TRANS_FLAG;
if (ret_flags)
*ret_flags = flags;
(*context_handle)->flags = flags;
(*context_handle)->more_flags |= LOCAL;
ret = gssapi_krb5_create_8003_checksum (minor_status,
input_chan_bindings,
flags,
&fwd_data,
&cksum);
krb5_data_free (&fwd_data);
if (ret)
goto failure;
#if 1
enctype = (*context_handle)->auth_context->keyblock->keytype;
#else
if ((*context_handle)->auth_context->enctype)
enctype = (*context_handle)->auth_context->enctype;
else {
kret = krb5_keytype_to_enctype(gssapi_krb5_context,
(*context_handle)->auth_context->keyblock->keytype,
&enctype);
if (kret)
return kret;
}
#endif
kret = krb5_build_authenticator (gssapi_krb5_context,
(*context_handle)->auth_context,
enctype,
cred,
&cksum,
&auth,
&authenticator,
KRB5_KU_AP_REQ_AUTH);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
kret = krb5_build_ap_req (gssapi_krb5_context,
enctype,
cred,
ap_options,
authenticator,
&outbuf);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
ret = GSS_S_FAILURE;
goto failure;
}
ret = gssapi_krb5_encapsulate (minor_status, &outbuf, output_token,
"\x01\x00");
if (ret)
goto failure;
krb5_data_free (&outbuf);
if (flags & GSS_C_MUTUAL_FLAG) {
return GSS_S_CONTINUE_NEEDED;
} else {
if (time_rec)
*time_rec = lifetime_rec;
(*context_handle)->more_flags |= OPEN;
return GSS_S_COMPLETE;
}
failure:
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);
krb5_data_free (&outbuf);
*context_handle = GSS_C_NO_CONTEXT;
return ret;
}
static OM_uint32
repl_mutual
(OM_uint32 * minor_status,
const gss_cred_id_t initiator_cred_handle,
gss_ctx_id_t * context_handle,
const gss_name_t target_name,
const gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
const gss_channel_bindings_t input_chan_bindings,
const gss_buffer_t input_token,
gss_OID * actual_mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec
)
{
OM_uint32 ret;
krb5_error_code kret;
krb5_data indata;
krb5_ap_rep_enc_part *repl;
output_token->length = 0;
output_token->value = NULL;
if (actual_mech_type)
*actual_mech_type = GSS_KRB5_MECHANISM;
ret = gssapi_krb5_decapsulate (minor_status, input_token, &indata,
"\x02\x00");
if (ret)
/* XXX - Handle AP_ERROR */
return ret;
kret = krb5_rd_rep (gssapi_krb5_context,
(*context_handle)->auth_context,
&indata,
&repl);
if (kret) {
gssapi_krb5_set_error_string ();
*minor_status = kret;
return GSS_S_FAILURE;
}
krb5_free_ap_rep_enc_part (gssapi_krb5_context,
repl);
(*context_handle)->more_flags |= OPEN;
*minor_status = 0;
if (time_rec) {
ret = gssapi_lifetime_left(minor_status,
(*context_handle)->lifetime,
time_rec);
} else {
ret = GSS_S_COMPLETE;
}
if (ret_flags)
*ret_flags = (*context_handle)->flags;
return ret;
}
/*
* gss_init_sec_context
*/
OM_uint32 gss_init_sec_context
(OM_uint32 * minor_status,
const gss_cred_id_t initiator_cred_handle,
gss_ctx_id_t * context_handle,
const gss_name_t target_name,
const gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
const gss_channel_bindings_t input_chan_bindings,
const gss_buffer_t input_token,
gss_OID * actual_mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec
)
{
GSSAPI_KRB5_INIT ();
output_token->length = 0;
output_token->value = NULL;
if (ret_flags)
*ret_flags = 0;
if (time_rec)
*time_rec = 0;
if (target_name == GSS_C_NO_NAME) {
if (actual_mech_type)
*actual_mech_type = GSS_C_NO_OID;
*minor_status = 0;
return GSS_S_BAD_NAME;
}
if (input_token == GSS_C_NO_BUFFER || input_token->length == 0)
return init_auth (minor_status,
initiator_cred_handle,
context_handle,
target_name,
mech_type,
req_flags,
time_req,
input_chan_bindings,
input_token,
actual_mech_type,
output_token,
ret_flags,
time_rec);
else
return repl_mutual(minor_status,
initiator_cred_handle,
context_handle,
target_name,
mech_type,
req_flags,
time_req,
input_chan_bindings,
input_token,
actual_mech_type,
output_token,
ret_flags,
time_rec);
}
Reference in New Issue View Git Blame Copy Permalink