297 lines
7.6 KiB
C
297 lines
7.6 KiB
C
/*-
|
|
* Copyright (c) 2005 Doug Rabson
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <gssapi/gssapi.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "mech_switch.h"
|
|
#include "context.h"
|
|
#include "cred.h"
|
|
#include "name.h"
|
|
#include "utils.h"
|
|
|
|
static OM_uint32
|
|
parse_header(const gss_buffer_t input_token, gss_OID mech_oid)
|
|
{
|
|
unsigned char *p = input_token->value;
|
|
size_t len = input_token->length;
|
|
size_t a, b;
|
|
|
|
/*
|
|
* Token must start with [APPLICATION 0] SEQUENCE.
|
|
* But if it doesn't assume it is DCE-STYLE Kerberos!
|
|
*/
|
|
if (len == 0)
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
|
|
p++;
|
|
len--;
|
|
|
|
/*
|
|
* Decode the length and make sure it agrees with the
|
|
* token length.
|
|
*/
|
|
if (len == 0)
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
if ((*p & 0x80) == 0) {
|
|
a = *p;
|
|
p++;
|
|
len--;
|
|
} else {
|
|
b = *p & 0x7f;
|
|
p++;
|
|
len--;
|
|
if (len < b)
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
a = 0;
|
|
while (b) {
|
|
a = (a << 8) | *p;
|
|
p++;
|
|
len--;
|
|
b--;
|
|
}
|
|
}
|
|
if (a != len)
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
|
|
/*
|
|
* Decode the OID for the mechanism. Simplify life by
|
|
* assuming that the OID length is less than 128 bytes.
|
|
*/
|
|
if (len < 2 || *p != 0x06)
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
if ((p[1] & 0x80) || p[1] > (len - 2))
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
mech_oid->length = p[1];
|
|
p += 2;
|
|
len -= 2;
|
|
mech_oid->elements = p;
|
|
|
|
return (GSS_S_COMPLETE);
|
|
}
|
|
|
|
static gss_OID_desc krb5_mechanism =
|
|
{9, (void *)(uintptr_t) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
|
|
static gss_OID_desc ntlm_mechanism =
|
|
{10, (void *)(uintptr_t) "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a"};
|
|
static gss_OID_desc spnego_mechanism =
|
|
{6, (void *)(uintptr_t) "\x2b\x06\x01\x05\x05\x02"};
|
|
|
|
static OM_uint32
|
|
choose_mech(const gss_buffer_t input, gss_OID mech_oid)
|
|
{
|
|
OM_uint32 status;
|
|
|
|
/*
|
|
* First try to parse the gssapi token header and see if it's a
|
|
* correct header, use that in the first hand.
|
|
*/
|
|
|
|
status = parse_header(input, mech_oid);
|
|
if (status == GSS_S_COMPLETE)
|
|
return (GSS_S_COMPLETE);
|
|
|
|
/*
|
|
* Lets guess what mech is really is, callback function to mech ??
|
|
*/
|
|
|
|
if (input->length > 8 &&
|
|
memcmp((const char *)input->value, "NTLMSSP\x00", 8) == 0)
|
|
{
|
|
*mech_oid = ntlm_mechanism;
|
|
return (GSS_S_COMPLETE);
|
|
} else if (input->length != 0 &&
|
|
((const char *)input->value)[0] == 0x6E)
|
|
{
|
|
/* Could be a raw AP-REQ (check for APPLICATION tag) */
|
|
*mech_oid = krb5_mechanism;
|
|
return (GSS_S_COMPLETE);
|
|
} else if (input->length == 0) {
|
|
/*
|
|
* There is the a wierd mode of SPNEGO (in CIFS and
|
|
* SASL GSS-SPENGO where the first token is zero
|
|
* length and the acceptor returns a mech_list, lets
|
|
* hope that is what is happening now.
|
|
*/
|
|
*mech_oid = spnego_mechanism;
|
|
return (GSS_S_COMPLETE);
|
|
}
|
|
return (status);
|
|
}
|
|
|
|
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,
|
|
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)
|
|
{
|
|
OM_uint32 major_status, mech_ret_flags;
|
|
struct _gss_mech_switch *m;
|
|
struct _gss_context *ctx = (struct _gss_context *) *context_handle;
|
|
struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle;
|
|
struct _gss_mechanism_cred *mc;
|
|
gss_cred_id_t acceptor_mc, delegated_mc;
|
|
gss_name_t src_mn;
|
|
int allocated_ctx;
|
|
|
|
*minor_status = 0;
|
|
if (src_name)
|
|
*src_name = GSS_C_NO_NAME;
|
|
if (mech_type)
|
|
*mech_type = GSS_C_NO_OID;
|
|
if (ret_flags)
|
|
*ret_flags = 0;
|
|
if (time_rec)
|
|
*time_rec = 0;
|
|
if (delegated_cred_handle)
|
|
*delegated_cred_handle = GSS_C_NO_CREDENTIAL;
|
|
_gss_buffer_zero(output_token);
|
|
|
|
/*
|
|
* If this is the first call (*context_handle is NULL), we must
|
|
* parse the input token to figure out the mechanism to use.
|
|
*/
|
|
if (*context_handle == GSS_C_NO_CONTEXT) {
|
|
gss_OID_desc mech_oid;
|
|
|
|
major_status = choose_mech(input_token, &mech_oid);
|
|
if (major_status != GSS_S_COMPLETE)
|
|
return (major_status);
|
|
|
|
/*
|
|
* Now that we have a mechanism, we can find the
|
|
* implementation.
|
|
*/
|
|
ctx = malloc(sizeof(struct _gss_context));
|
|
if (!ctx) {
|
|
*minor_status = ENOMEM;
|
|
return (GSS_S_DEFECTIVE_TOKEN);
|
|
}
|
|
memset(ctx, 0, sizeof(struct _gss_context));
|
|
m = ctx->gc_mech = _gss_find_mech_switch(&mech_oid);
|
|
if (!m) {
|
|
free(ctx);
|
|
return (GSS_S_BAD_MECH);
|
|
}
|
|
allocated_ctx = 1;
|
|
} else {
|
|
m = ctx->gc_mech;
|
|
allocated_ctx = 0;
|
|
}
|
|
|
|
if (cred) {
|
|
SLIST_FOREACH(mc, &cred->gc_mc, gmc_link)
|
|
if (mc->gmc_mech == m)
|
|
break;
|
|
if (!mc)
|
|
return (GSS_S_BAD_MECH);
|
|
acceptor_mc = mc->gmc_cred;
|
|
} else {
|
|
acceptor_mc = GSS_C_NO_CREDENTIAL;
|
|
}
|
|
delegated_mc = GSS_C_NO_CREDENTIAL;
|
|
|
|
mech_ret_flags = 0;
|
|
major_status = m->gm_accept_sec_context(minor_status,
|
|
&ctx->gc_ctx,
|
|
acceptor_mc,
|
|
input_token,
|
|
input_chan_bindings,
|
|
&src_mn,
|
|
mech_type,
|
|
output_token,
|
|
&mech_ret_flags,
|
|
time_rec,
|
|
&delegated_mc);
|
|
if (major_status != GSS_S_COMPLETE &&
|
|
major_status != GSS_S_CONTINUE_NEEDED) {
|
|
_gss_mg_error(m, major_status, *minor_status);
|
|
return (major_status);
|
|
}
|
|
|
|
if (src_name && src_mn) {
|
|
/*
|
|
* Make a new name and mark it as an MN.
|
|
*/
|
|
struct _gss_name *name = _gss_make_name(m, src_mn);
|
|
|
|
if (!name) {
|
|
m->gm_release_name(minor_status, &src_mn);
|
|
return (GSS_S_FAILURE);
|
|
}
|
|
*src_name = (gss_name_t) name;
|
|
} else if (src_mn) {
|
|
m->gm_release_name(minor_status, &src_mn);
|
|
}
|
|
|
|
if (delegated_mc == GSS_C_NO_CREDENTIAL)
|
|
mech_ret_flags &= ~GSS_C_DELEG_FLAG;
|
|
|
|
if (mech_ret_flags & GSS_C_DELEG_FLAG) {
|
|
if (!delegated_cred_handle) {
|
|
m->gm_release_cred(minor_status, &delegated_mc);
|
|
mech_ret_flags &= ~GSS_C_DELEG_FLAG;
|
|
} else {
|
|
struct _gss_cred *dcred;
|
|
struct _gss_mechanism_cred *dmc;
|
|
|
|
dcred = malloc(sizeof(struct _gss_cred));
|
|
if (!dcred) {
|
|
*minor_status = ENOMEM;
|
|
return (GSS_S_FAILURE);
|
|
}
|
|
SLIST_INIT(&dcred->gc_mc);
|
|
dmc = malloc(sizeof(struct _gss_mechanism_cred));
|
|
if (!dmc) {
|
|
free(dcred);
|
|
*minor_status = ENOMEM;
|
|
return (GSS_S_FAILURE);
|
|
}
|
|
dmc->gmc_mech = m;
|
|
dmc->gmc_mech_oid = &m->gm_mech_oid;
|
|
dmc->gmc_cred = delegated_mc;
|
|
SLIST_INSERT_HEAD(&dcred->gc_mc, dmc, gmc_link);
|
|
|
|
*delegated_cred_handle = (gss_cred_id_t) dcred;
|
|
}
|
|
}
|
|
|
|
if (ret_flags)
|
|
*ret_flags = mech_ret_flags;
|
|
*context_handle = (gss_ctx_id_t) ctx;
|
|
return (major_status);
|
|
}
|