257 lines
6.8 KiB
C
257 lines
6.8 KiB
C
/* $OpenBSD: gss-genr.c,v 1.1 2003/08/22 10:56:09 markus Exp $ */
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/*
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* Copyright (c) 2001-2003 Simon Wilkinson. 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#ifdef GSSAPI
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#include "xmalloc.h"
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#include "bufaux.h"
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#include "compat.h"
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#include "log.h"
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#include "monitor_wrap.h"
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#include "ssh-gss.h"
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/* Check that the OID in a data stream matches that in the context */
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int
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ssh_gssapi_check_oid(Gssctxt *ctx, void *data, size_t len)
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{
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return (ctx != NULL && ctx->oid != GSS_C_NO_OID &&
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ctx->oid->length == len &&
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memcmp(ctx->oid->elements, data, len) == 0);
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}
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/* Set the contexts OID from a data stream */
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void
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ssh_gssapi_set_oid_data(Gssctxt *ctx, void *data, size_t len)
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{
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if (ctx->oid != GSS_C_NO_OID) {
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xfree(ctx->oid->elements);
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xfree(ctx->oid);
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}
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ctx->oid = xmalloc(sizeof(gss_OID_desc));
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ctx->oid->length = len;
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ctx->oid->elements = xmalloc(len);
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memcpy(ctx->oid->elements, data, len);
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}
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/* Set the contexts OID */
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void
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ssh_gssapi_set_oid(Gssctxt *ctx, gss_OID oid)
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{
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ssh_gssapi_set_oid_data(ctx, oid->elements, oid->length);
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}
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/* All this effort to report an error ... */
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void
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ssh_gssapi_error(Gssctxt *ctxt)
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{
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debug("%s", ssh_gssapi_last_error(ctxt, NULL, NULL));
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}
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char *
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ssh_gssapi_last_error(Gssctxt *ctxt,
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OM_uint32 *major_status, OM_uint32 *minor_status)
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{
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OM_uint32 lmin;
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gss_buffer_desc msg = GSS_C_EMPTY_BUFFER;
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OM_uint32 ctx;
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Buffer b;
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char *ret;
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buffer_init(&b);
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if (major_status != NULL)
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*major_status = ctxt->major;
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if (minor_status != NULL)
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*minor_status = ctxt->minor;
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ctx = 0;
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/* The GSSAPI error */
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do {
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gss_display_status(&lmin, ctxt->major,
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GSS_C_GSS_CODE, GSS_C_NULL_OID, &ctx, &msg);
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buffer_append(&b, msg.value, msg.length);
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buffer_put_char(&b, '\n');
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gss_release_buffer(&lmin, &msg);
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} while (ctx != 0);
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/* The mechanism specific error */
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do {
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gss_display_status(&lmin, ctxt->minor,
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GSS_C_MECH_CODE, GSS_C_NULL_OID, &ctx, &msg);
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buffer_append(&b, msg.value, msg.length);
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buffer_put_char(&b, '\n');
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gss_release_buffer(&lmin, &msg);
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} while (ctx != 0);
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buffer_put_char(&b, '\0');
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ret = xmalloc(buffer_len(&b));
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buffer_get(&b, ret, buffer_len(&b));
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buffer_free(&b);
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return (ret);
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}
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/*
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* Initialise our GSSAPI context. We use this opaque structure to contain all
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* of the data which both the client and server need to persist across
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* {accept,init}_sec_context calls, so that when we do it from the userauth
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* stuff life is a little easier
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*/
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void
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ssh_gssapi_build_ctx(Gssctxt **ctx)
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{
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*ctx = xmalloc(sizeof (Gssctxt));
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(*ctx)->major = 0;
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(*ctx)->minor = 0;
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(*ctx)->context = GSS_C_NO_CONTEXT;
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(*ctx)->name = GSS_C_NO_NAME;
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(*ctx)->oid = GSS_C_NO_OID;
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(*ctx)->creds = GSS_C_NO_CREDENTIAL;
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(*ctx)->client = GSS_C_NO_NAME;
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(*ctx)->client_creds = GSS_C_NO_CREDENTIAL;
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}
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/* Delete our context, providing it has been built correctly */
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void
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ssh_gssapi_delete_ctx(Gssctxt **ctx)
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{
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OM_uint32 ms;
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if ((*ctx) == NULL)
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return;
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if ((*ctx)->context != GSS_C_NO_CONTEXT)
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gss_delete_sec_context(&ms, &(*ctx)->context, GSS_C_NO_BUFFER);
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if ((*ctx)->name != GSS_C_NO_NAME)
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gss_release_name(&ms, &(*ctx)->name);
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if ((*ctx)->oid != GSS_C_NO_OID) {
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xfree((*ctx)->oid->elements);
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xfree((*ctx)->oid);
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(*ctx)->oid = GSS_C_NO_OID;
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}
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if ((*ctx)->creds != GSS_C_NO_CREDENTIAL)
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gss_release_cred(&ms, &(*ctx)->creds);
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if ((*ctx)->client != GSS_C_NO_NAME)
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gss_release_name(&ms, &(*ctx)->client);
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if ((*ctx)->client_creds != GSS_C_NO_CREDENTIAL)
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gss_release_cred(&ms, &(*ctx)->client_creds);
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xfree(*ctx);
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*ctx = NULL;
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}
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/*
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* Wrapper to init_sec_context
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* Requires that the context contains:
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* oid
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* server name (from ssh_gssapi_import_name)
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*/
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OM_uint32
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ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok,
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gss_buffer_desc* send_tok, OM_uint32 *flags)
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{
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int deleg_flag = 0;
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if (deleg_creds) {
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deleg_flag = GSS_C_DELEG_FLAG;
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debug("Delegating credentials");
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}
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ctx->major = gss_init_sec_context(&ctx->minor,
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GSS_C_NO_CREDENTIAL, &ctx->context, ctx->name, ctx->oid,
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GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | deleg_flag,
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0, NULL, recv_tok, NULL, send_tok, flags, NULL);
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if (GSS_ERROR(ctx->major))
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ssh_gssapi_error(ctx);
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return (ctx->major);
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}
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/* Create a service name for the given host */
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OM_uint32
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ssh_gssapi_import_name(Gssctxt *ctx, const char *host)
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{
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gss_buffer_desc gssbuf;
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gssbuf.length = sizeof("host@") + strlen(host);
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gssbuf.value = xmalloc(gssbuf.length);
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snprintf(gssbuf.value, gssbuf.length, "host@%s", host);
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if ((ctx->major = gss_import_name(&ctx->minor,
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&gssbuf, GSS_C_NT_HOSTBASED_SERVICE, &ctx->name)))
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ssh_gssapi_error(ctx);
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xfree(gssbuf.value);
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return (ctx->major);
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}
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/* Acquire credentials for a server running on the current host.
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* Requires that the context structure contains a valid OID
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*/
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/* Returns a GSSAPI error code */
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OM_uint32
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ssh_gssapi_acquire_cred(Gssctxt *ctx)
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{
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OM_uint32 status;
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char lname[MAXHOSTNAMELEN];
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gss_OID_set oidset;
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gss_create_empty_oid_set(&status, &oidset);
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gss_add_oid_set_member(&status, ctx->oid, &oidset);
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if (gethostname(lname, MAXHOSTNAMELEN))
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return (-1);
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if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname)))
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return (ctx->major);
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if ((ctx->major = gss_acquire_cred(&ctx->minor,
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ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
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ssh_gssapi_error(ctx);
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gss_release_oid_set(&status, &oidset);
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return (ctx->major);
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}
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OM_uint32
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ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) {
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if (*ctx)
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ssh_gssapi_delete_ctx(ctx);
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ssh_gssapi_build_ctx(ctx);
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ssh_gssapi_set_oid(*ctx, oid);
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return (ssh_gssapi_acquire_cred(*ctx));
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}
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#endif /* GSSAPI */
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