8a16b7a18f
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293 lines
7.7 KiB
C
293 lines
7.7 KiB
C
/*
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SPDX-License-Identifier: BSD-3-Clause
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rpcsec_gss_prot.c
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Copyright (c) 2000 The Regents of the University of Michigan.
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All rights reserved.
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Copyright (c) 2000 Dug Song <dugsong@UMICH.EDU>.
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All rights reserved, all wrongs reversed.
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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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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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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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3. Neither the name of the University nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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$Id: authgss_prot.c,v 1.18 2000/09/01 04:14:03 dugsong Exp $
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*/
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/* $FreeBSD$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include "rpcsec_gss_int.h"
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#define MAX_GSS_SIZE 10240 /* XXX */
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bool_t
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xdr_gss_buffer_desc(XDR *xdrs, gss_buffer_desc *p)
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{
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char *val;
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u_int len;
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bool_t ret;
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val = p->value;
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len = p->length;
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ret = xdr_bytes(xdrs, &val, &len, MAX_GSS_SIZE);
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p->value = val;
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p->length = len;
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return (ret);
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}
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bool_t
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xdr_rpc_gss_cred(XDR *xdrs, struct rpc_gss_cred *p)
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{
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enum_t proc, svc;
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bool_t ret;
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proc = p->gc_proc;
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svc = p->gc_svc;
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ret = (xdr_u_int(xdrs, &p->gc_version) &&
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xdr_enum(xdrs, &proc) &&
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xdr_u_int(xdrs, &p->gc_seq) &&
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xdr_enum(xdrs, &svc) &&
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xdr_gss_buffer_desc(xdrs, &p->gc_handle));
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p->gc_proc = proc;
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p->gc_svc = svc;
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return (ret);
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}
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bool_t
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xdr_rpc_gss_init_res(XDR *xdrs, struct rpc_gss_init_res *p)
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{
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return (xdr_gss_buffer_desc(xdrs, &p->gr_handle) &&
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xdr_u_int(xdrs, &p->gr_major) &&
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xdr_u_int(xdrs, &p->gr_minor) &&
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xdr_u_int(xdrs, &p->gr_win) &&
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xdr_gss_buffer_desc(xdrs, &p->gr_token));
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}
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bool_t
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xdr_rpc_gss_wrap_data(XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr,
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gss_ctx_id_t ctx, gss_qop_t qop,
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rpc_gss_service_t svc, u_int seq)
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{
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gss_buffer_desc databuf, wrapbuf;
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OM_uint32 maj_stat, min_stat;
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int start, end, conf_state;
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u_int len;
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bool_t xdr_stat;
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/* Skip databody length. */
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start = XDR_GETPOS(xdrs);
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XDR_SETPOS(xdrs, start + 4);
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/* Marshal rpc_gss_data_t (sequence number + arguments). */
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if (!xdr_u_int(xdrs, &seq) || !xdr_func(xdrs, xdr_ptr))
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return (FALSE);
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end = XDR_GETPOS(xdrs);
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/* Set databuf to marshalled rpc_gss_data_t. */
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databuf.length = end - start - 4;
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XDR_SETPOS(xdrs, start + 4);
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databuf.value = XDR_INLINE(xdrs, databuf.length);
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xdr_stat = FALSE;
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if (svc == rpc_gss_svc_integrity) {
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/* Marshal databody_integ length. */
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XDR_SETPOS(xdrs, start);
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len = databuf.length;
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if (!xdr_u_int(xdrs, &len))
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return (FALSE);
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/* Checksum rpc_gss_data_t. */
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maj_stat = gss_get_mic(&min_stat, ctx, qop,
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&databuf, &wrapbuf);
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if (maj_stat != GSS_S_COMPLETE) {
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log_debug("gss_get_mic failed");
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return (FALSE);
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}
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/* Marshal checksum. */
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XDR_SETPOS(xdrs, end);
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xdr_stat = xdr_gss_buffer_desc(xdrs, &wrapbuf);
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gss_release_buffer(&min_stat, &wrapbuf);
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}
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else if (svc == rpc_gss_svc_privacy) {
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/* Encrypt rpc_gss_data_t. */
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maj_stat = gss_wrap(&min_stat, ctx, TRUE, qop, &databuf,
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&conf_state, &wrapbuf);
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if (maj_stat != GSS_S_COMPLETE) {
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log_status("gss_wrap", NULL, maj_stat, min_stat);
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return (FALSE);
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}
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/* Marshal databody_priv. */
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XDR_SETPOS(xdrs, start);
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xdr_stat = xdr_gss_buffer_desc(xdrs, &wrapbuf);
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gss_release_buffer(&min_stat, &wrapbuf);
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}
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return (xdr_stat);
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}
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bool_t
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xdr_rpc_gss_unwrap_data(XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr,
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gss_ctx_id_t ctx, gss_qop_t qop,
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rpc_gss_service_t svc, u_int seq)
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{
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XDR tmpxdrs;
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gss_buffer_desc databuf, wrapbuf;
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OM_uint32 maj_stat, min_stat;
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u_int seq_num, conf_state, qop_state;
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bool_t xdr_stat;
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if (xdr_func == (xdrproc_t) xdr_void || xdr_ptr == NULL)
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return (TRUE);
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memset(&databuf, 0, sizeof(databuf));
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memset(&wrapbuf, 0, sizeof(wrapbuf));
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if (svc == rpc_gss_svc_integrity) {
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/* Decode databody_integ. */
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if (!xdr_gss_buffer_desc(xdrs, &databuf)) {
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log_debug("xdr decode databody_integ failed");
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return (FALSE);
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}
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/* Decode checksum. */
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if (!xdr_gss_buffer_desc(xdrs, &wrapbuf)) {
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mem_free(databuf.value, databuf.length);
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log_debug("xdr decode checksum failed");
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return (FALSE);
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}
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/* Verify checksum and QOP. */
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maj_stat = gss_verify_mic(&min_stat, ctx, &databuf,
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&wrapbuf, &qop_state);
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mem_free(wrapbuf.value, wrapbuf.length);
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if (maj_stat != GSS_S_COMPLETE || qop_state != qop) {
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mem_free(databuf.value, databuf.length);
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log_status("gss_verify_mic", NULL, maj_stat, min_stat);
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return (FALSE);
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}
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} else if (svc == rpc_gss_svc_privacy) {
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/* Decode databody_priv. */
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if (!xdr_gss_buffer_desc(xdrs, &wrapbuf)) {
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log_debug("xdr decode databody_priv failed");
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return (FALSE);
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}
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/* Decrypt databody. */
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maj_stat = gss_unwrap(&min_stat, ctx, &wrapbuf, &databuf,
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&conf_state, &qop_state);
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mem_free(wrapbuf.value, wrapbuf.length);
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/* Verify encryption and QOP. */
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if (maj_stat != GSS_S_COMPLETE || qop_state != qop ||
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conf_state != TRUE) {
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gss_release_buffer(&min_stat, &databuf);
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log_status("gss_unwrap", NULL, maj_stat, min_stat);
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return (FALSE);
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}
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}
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/* Decode rpc_gss_data_t (sequence number + arguments). */
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xdrmem_create(&tmpxdrs, databuf.value, databuf.length, XDR_DECODE);
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xdr_stat = (xdr_u_int(&tmpxdrs, &seq_num) &&
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xdr_func(&tmpxdrs, xdr_ptr));
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XDR_DESTROY(&tmpxdrs);
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/*
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* Integrity service allocates databuf via XDR so free it the
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* same way.
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*/
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if (svc == rpc_gss_svc_integrity) {
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xdr_free((xdrproc_t) xdr_gss_buffer_desc, (char *) &databuf);
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} else {
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gss_release_buffer(&min_stat, &databuf);
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}
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/* Verify sequence number. */
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if (xdr_stat == TRUE && seq_num != seq) {
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log_debug("wrong sequence number in databody");
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return (FALSE);
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}
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return (xdr_stat);
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}
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#ifdef DEBUG
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#include <ctype.h>
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void
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log_debug(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "rpcsec_gss: ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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}
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void
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log_status(const char *m, gss_OID mech, OM_uint32 maj_stat, OM_uint32 min_stat)
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{
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OM_uint32 min;
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gss_buffer_desc msg;
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int msg_ctx = 0;
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fprintf(stderr, "rpcsec_gss: %s: ", m);
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gss_display_status(&min, maj_stat, GSS_C_GSS_CODE, GSS_C_NULL_OID,
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&msg_ctx, &msg);
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fprintf(stderr, "%s - ", (char *)msg.value);
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gss_release_buffer(&min, &msg);
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gss_display_status(&min, min_stat, GSS_C_MECH_CODE, mech,
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&msg_ctx, &msg);
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fprintf(stderr, "%s\n", (char *)msg.value);
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gss_release_buffer(&min, &msg);
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}
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#else
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void
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log_debug(__unused const char *fmt, ...)
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{
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}
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void
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log_status(__unused const char *m, __unused gss_OID mech,
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__unused OM_uint32 maj_stat, __unused OM_uint32 min_stat)
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{
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}
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#endif
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