/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */
/* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */


/*  ssl/kssl.c  --  Routines to support (& debug) Kerberos5 auth for openssl
**
**  19990701	VRS 	Started.
**  200011??	Jeffrey Altman, Richard Levitte
**          		Generalized for Heimdal, Newer MIT, & Win32.
**          		Integrated into main OpenSSL 0.9.7 snapshots.
**  20010413	Simon Wilkinson, VRS
**          		Real RFC2712 KerberosWrapper replaces AP_REQ.
*/

#include <openssl/opensslconf.h>

#define _XOPEN_SOURCE 500 /* glibc2 needs this to declare strptime() */
#include <time.h>
#if 0 /* experimental */
#undef _XOPEN_SOURCE /* To avoid clashes with anything else... */
#endif
#include <string.h>

#define KRB5_PRIVATE	1

#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/krb5_asn.h>

#ifndef OPENSSL_NO_KRB5

#ifndef ENOMEM
#define ENOMEM KRB5KRB_ERR_GENERIC
#endif

/* 
 * When OpenSSL is built on Windows, we do not want to require that
 * the Kerberos DLLs be available in order for the OpenSSL DLLs to
 * work.  Therefore, all Kerberos routines are loaded at run time
 * and we do not link to a .LIB file.
 */

#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
/* 
 * The purpose of the following pre-processor statements is to provide
 * compatibility with different releases of MIT Kerberos for Windows.
 * All versions up to 1.2 used macros.  But macros do not allow for
 * a binary compatible interface for DLLs.  Therefore, all macros are
 * being replaced by function calls.  The following code will allow
 * an OpenSSL DLL built on Windows to work whether or not the macro
 * or function form of the routines are utilized.
 */
#ifdef  krb5_cc_get_principal
#define NO_DEF_KRB5_CCACHE
#undef  krb5_cc_get_principal
#endif
#define krb5_cc_get_principal    kssl_krb5_cc_get_principal

#define krb5_free_data_contents  kssl_krb5_free_data_contents   
#define krb5_free_context        kssl_krb5_free_context         
#define krb5_auth_con_free       kssl_krb5_auth_con_free        
#define krb5_free_principal      kssl_krb5_free_principal       
#define krb5_mk_req_extended     kssl_krb5_mk_req_extended      
#define krb5_get_credentials     kssl_krb5_get_credentials      
#define krb5_cc_default          kssl_krb5_cc_default           
#define krb5_sname_to_principal  kssl_krb5_sname_to_principal   
#define krb5_init_context        kssl_krb5_init_context         
#define krb5_free_ticket         kssl_krb5_free_ticket          
#define krb5_rd_req              kssl_krb5_rd_req               
#define krb5_kt_default          kssl_krb5_kt_default           
#define krb5_kt_resolve          kssl_krb5_kt_resolve           
/* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
#ifndef krb5_kt_close
#define krb5_kt_close            kssl_krb5_kt_close
#endif /* krb5_kt_close */
#ifndef krb5_kt_get_entry
#define krb5_kt_get_entry        kssl_krb5_kt_get_entry
#endif /* krb5_kt_get_entry */
#define krb5_auth_con_init       kssl_krb5_auth_con_init        

#define krb5_principal_compare   kssl_krb5_principal_compare
#define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
#define krb5_timeofday           kssl_krb5_timeofday
#define krb5_rc_default           kssl_krb5_rc_default

#ifdef krb5_rc_initialize
#undef krb5_rc_initialize
#endif
#define krb5_rc_initialize   kssl_krb5_rc_initialize

#ifdef krb5_rc_get_lifespan
#undef krb5_rc_get_lifespan
#endif
#define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan

#ifdef krb5_rc_destroy
#undef krb5_rc_destroy
#endif
#define krb5_rc_destroy      kssl_krb5_rc_destroy

#define valid_cksumtype      kssl_valid_cksumtype
#define krb5_checksum_size   kssl_krb5_checksum_size
#define krb5_kt_free_entry   kssl_krb5_kt_free_entry
#define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
#define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
#define krb5_get_server_rcache   kssl_krb5_get_server_rcache

/* Prototypes for built in stubs */
void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
void kssl_krb5_free_principal(krb5_context, krb5_principal );
krb5_error_code kssl_krb5_kt_resolve(krb5_context,
                                     krb5_const char *,
                                     krb5_keytab *);
krb5_error_code kssl_krb5_kt_default(krb5_context,
                                     krb5_keytab *);
krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 
                                 krb5_const krb5_data *,
                                 krb5_const_principal, krb5_keytab, 
                                 krb5_flags *,krb5_ticket **);

krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
                                         krb5_const_principal);
krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
                                          krb5_auth_context  *,
                                          krb5_const krb5_flags,
                                          krb5_data  *,
                                          krb5_creds  *,
                                          krb5_data  * );
krb5_error_code kssl_krb5_init_context(krb5_context *);
void kssl_krb5_free_context(krb5_context);
krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
                                             krb5_const char  *,
                                             krb5_const char  *,
                                             krb5_int32,
                                             krb5_principal  *);
krb5_error_code kssl_krb5_get_credentials(krb5_context,
                                          krb5_const krb5_flags,
                                          krb5_ccache,
                                          krb5_creds  *,
                                          krb5_creds  *  *);
krb5_error_code kssl_krb5_auth_con_init(krb5_context,
                                        krb5_auth_context  *);
krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 
                                           krb5_ccache cache,
                                           krb5_principal *principal);
krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 
                                             krb5_auth_context, 
                                             krb5_rcache);
krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 
                                            krb5_const krb5_data *,
                                            krb5_rcache *);
krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 
                                             krb5_auth_context,
                                             krb5_rcache *);

/* Function pointers (almost all Kerberos functions are _stdcall) */
static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
	=NULL;
static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
	=NULL;
static krb5_error_code(_stdcall *p_krb5_kt_resolve)
			(krb5_context, krb5_const char *, krb5_keytab *)=NULL;
static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
                                                     krb5_keytab *)=NULL;
static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, 
                                                      krb5_ticket *)=NULL;
static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, 
                                                 krb5_auth_context *, 
                                                 krb5_const krb5_data *,
                                                 krb5_const_principal, 
                                                 krb5_keytab, krb5_flags *,
                                                 krb5_ticket **)=NULL;
static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
			(krb5_context, krb5_auth_context *,
			 krb5_const krb5_flags, krb5_data *, krb5_creds *,
			 krb5_data * )=NULL;
static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
                                                     krb5_ccache  *)=NULL;
static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
			(krb5_context, krb5_const char *, krb5_const char *,
			 krb5_int32, krb5_principal *)=NULL;
static krb5_error_code (_stdcall *p_krb5_get_credentials)
			(krb5_context, krb5_const krb5_flags, krb5_ccache,
			 krb5_creds *, krb5_creds **)=NULL;
static krb5_error_code (_stdcall *p_krb5_auth_con_init)
			(krb5_context, krb5_auth_context *)=NULL;
static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
			(krb5_context context, krb5_ccache cache,
			 krb5_principal *principal)=NULL;
static krb5_error_code (_stdcall *p_krb5_auth_con_free)
			(krb5_context, krb5_auth_context)=NULL;
static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
                        (krb5_context, krb5_const krb5_keyblock *,
                                           krb5_ticket *)=NULL;
static krb5_error_code (_stdcall *p_krb5_timeofday)
                        (krb5_context context, krb5_int32 *timeret)=NULL;
static krb5_error_code (_stdcall *p_krb5_rc_default)
                        (krb5_context context, krb5_rcache *rc)=NULL;
static krb5_error_code (_stdcall *p_krb5_rc_initialize)
                        (krb5_context context, krb5_rcache rc,
                                     krb5_deltat lifespan)=NULL;
static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
                        (krb5_context context, krb5_rcache rc,
                                       krb5_deltat *lifespan)=NULL;
static krb5_error_code (_stdcall *p_krb5_rc_destroy)
                        (krb5_context context, krb5_rcache rc)=NULL;
static krb5_boolean (_stdcall *p_krb5_principal_compare)
                     (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
                        (krb5_context,krb5_keytab_entry * )=NULL;
static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context, 
                                                               krb5_auth_context, 
                                                               krb5_rcache)=NULL;
static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context, 
                                                              krb5_const krb5_data *, 
                                                              krb5_rcache *)=NULL;
static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context, 
                                                      krb5_auth_context,
                                                      krb5_rcache *)=NULL;
static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context, 
                                                    krb5_keytab keytab)=NULL;
static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context, 
                                                        krb5_keytab keytab,
                       krb5_const_principal principal, krb5_kvno vno,
                       krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */

/* Function to Load the Kerberos 5 DLL and initialize function pointers */
void
load_krb5_dll(void)
	{
	HANDLE hKRB5_32;
    
	krb5_loaded++;
	hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
	if (!hKRB5_32)
		return;

	(FARPROC) p_krb5_free_data_contents =
		GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
	(FARPROC) p_krb5_free_context =
		GetProcAddress( hKRB5_32, "krb5_free_context" );
	(FARPROC) p_krb5_auth_con_free =
		GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
	(FARPROC) p_krb5_free_principal =
		GetProcAddress( hKRB5_32, "krb5_free_principal" );
	(FARPROC) p_krb5_mk_req_extended =
		GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
	(FARPROC) p_krb5_get_credentials =
		GetProcAddress( hKRB5_32, "krb5_get_credentials" );
	(FARPROC) p_krb5_cc_get_principal =
		GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
	(FARPROC) p_krb5_cc_default =
		GetProcAddress( hKRB5_32, "krb5_cc_default" );
	(FARPROC) p_krb5_sname_to_principal =
		GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
	(FARPROC) p_krb5_init_context =
		GetProcAddress( hKRB5_32, "krb5_init_context" );
	(FARPROC) p_krb5_free_ticket =
		GetProcAddress( hKRB5_32, "krb5_free_ticket" );
	(FARPROC) p_krb5_rd_req =
		GetProcAddress( hKRB5_32, "krb5_rd_req" );
	(FARPROC) p_krb5_principal_compare =
		GetProcAddress( hKRB5_32, "krb5_principal_compare" );
	(FARPROC) p_krb5_decrypt_tkt_part =
		GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
	(FARPROC) p_krb5_timeofday =
		GetProcAddress( hKRB5_32, "krb5_timeofday" );
	(FARPROC) p_krb5_rc_default =
		GetProcAddress( hKRB5_32, "krb5_rc_default" );
	(FARPROC) p_krb5_rc_initialize =
		GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
	(FARPROC) p_krb5_rc_get_lifespan =
		GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
	(FARPROC) p_krb5_rc_destroy =
		GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
	(FARPROC) p_krb5_kt_default =
		GetProcAddress( hKRB5_32, "krb5_kt_default" );
	(FARPROC) p_krb5_kt_resolve =
		GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
	(FARPROC) p_krb5_auth_con_init =
		GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
        (FARPROC) p_valid_cksumtype =
                GetProcAddress( hKRB5_32, "valid_cksumtype" );
        (FARPROC) p_krb5_checksum_size =
                GetProcAddress( hKRB5_32, "krb5_checksum_size" );
        (FARPROC) p_krb5_kt_free_entry =
                GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
        (FARPROC) p_krb5_auth_con_setrcache =
                GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
        (FARPROC) p_krb5_get_server_rcache =
                GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
        (FARPROC) p_krb5_auth_con_getrcache =
                GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
        (FARPROC) p_krb5_kt_close =
                GetProcAddress( hKRB5_32, "krb5_kt_close" );
        (FARPROC) p_krb5_kt_get_entry =
                GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
	}

/* Stubs for each function to be dynamicly loaded */
void
kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_free_data_contents )
		p_krb5_free_data_contents(CO,data);
	}

krb5_error_code
kssl_krb5_mk_req_extended (krb5_context CO,
                          krb5_auth_context  * pACO,
                          krb5_const krb5_flags F,
                          krb5_data  * pD1,
                          krb5_creds  * pC,
                          krb5_data  * pD2)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_mk_req_extended )
		return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
	else
		return KRB5KRB_ERR_GENERIC;
	}
krb5_error_code
kssl_krb5_auth_con_init(krb5_context CO,
                       krb5_auth_context  * pACO)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_auth_con_init )
		return(p_krb5_auth_con_init(CO,pACO));
	else
		return KRB5KRB_ERR_GENERIC;
	}
krb5_error_code
kssl_krb5_auth_con_free (krb5_context CO,
                        krb5_auth_context ACO)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_auth_con_free )
		return(p_krb5_auth_con_free(CO,ACO));
	else
		return KRB5KRB_ERR_GENERIC;
	}
krb5_error_code
kssl_krb5_get_credentials(krb5_context CO,
                         krb5_const krb5_flags F,
                         krb5_ccache CC,
                         krb5_creds  * pCR,
                         krb5_creds  ** ppCR)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_get_credentials )
		return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
	else
		return KRB5KRB_ERR_GENERIC;
	}
krb5_error_code
kssl_krb5_sname_to_principal(krb5_context CO,
                            krb5_const char  * pC1,
                            krb5_const char  * pC2,
                            krb5_int32 I,
                            krb5_principal  * pPR)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_sname_to_principal )
		return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_cc_default(krb5_context CO,
                    krb5_ccache  * pCC)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_cc_default )
		return(p_krb5_cc_default(CO,pCC));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_init_context(krb5_context * pCO)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_init_context )
		return(p_krb5_init_context(pCO));
	else
		return KRB5KRB_ERR_GENERIC;
	}

void
kssl_krb5_free_context(krb5_context CO)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_free_context )
		p_krb5_free_context(CO);
	}

void
kssl_krb5_free_principal(krb5_context c, krb5_principal p)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_free_principal )
		p_krb5_free_principal(c,p);
	}

krb5_error_code
kssl_krb5_kt_resolve(krb5_context con,
                    krb5_const char * sz,
                    krb5_keytab * kt)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_kt_resolve )
		return(p_krb5_kt_resolve(con,sz,kt));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_kt_default(krb5_context con,
                    krb5_keytab * kt)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_kt_default )
		return(p_krb5_kt_default(con,kt));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_free_ticket(krb5_context con,
                     krb5_ticket * kt)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_free_ticket )
		return(p_krb5_free_ticket(con,kt));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
                krb5_const krb5_data * data,
                krb5_const_principal princ, krb5_keytab keytab,
                krb5_flags * flags, krb5_ticket ** pptkt)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_rd_req )
		return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_boolean
krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
                krb5_const_principal princ2)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_principal_compare )
		return(p_krb5_principal_compare(con,princ1,princ2));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
                krb5_ticket *ticket)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_decrypt_tkt_part )
		return(p_krb5_decrypt_tkt_part(con,keys,ticket));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_timeofday(krb5_context con, krb5_int32 *timeret)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_timeofday )
		return(p_krb5_timeofday(con,timeret));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_rc_default(krb5_context con, krb5_rcache *rc)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_rc_default )
		return(p_krb5_rc_default(con,rc));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_rc_initialize )
		return(p_krb5_rc_initialize(con, rc, lifespan));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_rc_get_lifespan )
		return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
	else
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
krb5_rc_destroy(krb5_context con, krb5_rcache rc)
	{
	if (!krb5_loaded)
		load_krb5_dll();

	if ( p_krb5_rc_destroy )
		return(p_krb5_rc_destroy(con, rc));
	else
		return KRB5KRB_ERR_GENERIC;
	}

size_t 
krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
        {
        if (!krb5_loaded)
                load_krb5_dll();

        if ( p_krb5_checksum_size )
                return(p_krb5_checksum_size(context, ctype));
        else
                return KRB5KRB_ERR_GENERIC;
        }

krb5_boolean 
valid_cksumtype(krb5_cksumtype ctype)
        {
        if (!krb5_loaded)
                load_krb5_dll();

        if ( p_valid_cksumtype )
                return(p_valid_cksumtype(ctype));
        else
                return KRB5KRB_ERR_GENERIC;
        }

krb5_error_code 
krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
        {
        if (!krb5_loaded)
                load_krb5_dll();

        if ( p_krb5_kt_free_entry )
                return(p_krb5_kt_free_entry(con,entry));
        else
                return KRB5KRB_ERR_GENERIC;
        }
                 
/* Structure definitions  */
#ifndef NO_DEF_KRB5_CCACHE
#ifndef krb5_x
#define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
#define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
#endif 

typedef	krb5_pointer	krb5_cc_cursor;	/* cursor for sequential lookup */

typedef struct _krb5_ccache
	{
	krb5_magic magic;
	struct _krb5_cc_ops FAR *ops;
	krb5_pointer data;
	} *krb5_ccache;

typedef struct _krb5_cc_ops
	{
	krb5_magic magic;
	char  *prefix;
	char  * (KRB5_CALLCONV *get_name)
		(krb5_context, krb5_ccache);
	krb5_error_code (KRB5_CALLCONV *resolve)
		(krb5_context, krb5_ccache  *, const char  *);
	krb5_error_code (KRB5_CALLCONV *gen_new)
		(krb5_context, krb5_ccache  *);
	krb5_error_code (KRB5_CALLCONV *init)
		(krb5_context, krb5_ccache, krb5_principal);
	krb5_error_code (KRB5_CALLCONV *destroy)
		(krb5_context, krb5_ccache);
	krb5_error_code (KRB5_CALLCONV *close)
		(krb5_context, krb5_ccache);
	krb5_error_code (KRB5_CALLCONV *store)
		(krb5_context, krb5_ccache, krb5_creds  *);
	krb5_error_code (KRB5_CALLCONV *retrieve)
		(krb5_context, krb5_ccache,
		krb5_flags, krb5_creds  *, krb5_creds  *);
	krb5_error_code (KRB5_CALLCONV *get_princ)
		(krb5_context, krb5_ccache, krb5_principal  *);
	krb5_error_code (KRB5_CALLCONV *get_first)
		(krb5_context, krb5_ccache, krb5_cc_cursor  *);
	krb5_error_code (KRB5_CALLCONV *get_next)
		(krb5_context, krb5_ccache,
		krb5_cc_cursor  *, krb5_creds  *);
	krb5_error_code (KRB5_CALLCONV *end_get)
		(krb5_context, krb5_ccache, krb5_cc_cursor  *);
	krb5_error_code (KRB5_CALLCONV *remove_cred)
		(krb5_context, krb5_ccache,
		krb5_flags, krb5_creds  *);
	krb5_error_code (KRB5_CALLCONV *set_flags)
		(krb5_context, krb5_ccache, krb5_flags);
	} krb5_cc_ops;
#endif /* NO_DEF_KRB5_CCACHE */

krb5_error_code 
kssl_krb5_cc_get_principal
    (krb5_context context, krb5_ccache cache,
      krb5_principal *principal)
	{
	if ( p_krb5_cc_get_principal )
		return(p_krb5_cc_get_principal(context,cache,principal));
	else
		return(krb5_x
			((cache)->ops->get_princ,(context, cache, principal)));
	}

krb5_error_code
kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
                             krb5_rcache rcache)
        {
        if ( p_krb5_auth_con_setrcache )
                 return(p_krb5_auth_con_setrcache(con,acon,rcache));
        else
                 return KRB5KRB_ERR_GENERIC;
        }

krb5_error_code
kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
                            krb5_rcache * rcache) 
        {
	if ( p_krb5_get_server_rcache )
		return(p_krb5_get_server_rcache(con,data,rcache));
	else
		return KRB5KRB_ERR_GENERIC;
        }

krb5_error_code
kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
                             krb5_rcache * prcache)
        {
	if ( p_krb5_auth_con_getrcache )
		return(p_krb5_auth_con_getrcache(con,acon, prcache));
	else
		return KRB5KRB_ERR_GENERIC;
	}
 
krb5_error_code
kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
	{
	if ( p_krb5_kt_close )
		return(p_krb5_kt_close(context,keytab));
	else 
		return KRB5KRB_ERR_GENERIC;
	}

krb5_error_code
kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
                       krb5_const_principal principal, krb5_kvno vno,
                       krb5_enctype enctype, krb5_keytab_entry *entry)
	{
	if ( p_krb5_kt_get_entry )
		return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
	else
		return KRB5KRB_ERR_GENERIC;
        }
#endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */


/* memory allocation functions for non-temporary storage
 * (e.g. stuff that gets saved into the kssl context) */
static void* kssl_calloc(size_t nmemb, size_t size)
{
	void* p;
	
	p=OPENSSL_malloc(nmemb*size);
	if (p){
		memset(p, 0, nmemb*size);
	}
	return p;
}

#define kssl_malloc(size) OPENSSL_malloc((size))
#define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size)
#define kssl_free(ptr) OPENSSL_free((ptr))


char
*kstring(char *string)
        {
        static char	*null = "[NULL]";

	return ((string == NULL)? null: string);
        }

/*	Given KRB5 enctype (basically DES or 3DES),
**	return closest match openssl EVP_ encryption algorithm.
**	Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
**	Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
*/
const EVP_CIPHER *
kssl_map_enc(krb5_enctype enctype)
        {
	switch (enctype)
		{
	case ENCTYPE_DES_HMAC_SHA1:		/*    EVP_des_cbc();       */
	case ENCTYPE_DES_CBC_CRC:
	case ENCTYPE_DES_CBC_MD4:
	case ENCTYPE_DES_CBC_MD5:
	case ENCTYPE_DES_CBC_RAW:
				return EVP_des_cbc();
				break;
	case ENCTYPE_DES3_CBC_SHA1:		/*    EVP_des_ede3_cbc();  */
	case ENCTYPE_DES3_CBC_SHA:
	case ENCTYPE_DES3_CBC_RAW:
				return EVP_des_ede3_cbc();
				break;
	default:                return NULL;
				break;
		}
	}


/*	Return true:1 if p "looks like" the start of the real authenticator
**	described in kssl_skip_confound() below.  The ASN.1 pattern is
**	"62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
**	xx and yy are possibly multi-byte length fields.
*/
int 	kssl_test_confound(unsigned char *p)
	{
	int 	len = 2;
	int 	xx = 0, yy = 0;

	if (*p++ != 0x62)  return 0;
	if (*p > 0x82)  return 0;
	switch(*p)  {
		case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
		case 0x81:  p++;          xx =  *p++;  break;
		case 0x80:  return 0;
		default:    xx = *p++;  break;
		}
	if (*p++ != 0x30)  return 0;
	if (*p > 0x82)  return 0;
	switch(*p)  {
		case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
		case 0x81:  p++; len++;   yy =  *p++;  break;
		case 0x80:  return 0;
		default:    yy = *p++;  break;
		}

	return (xx - len == yy)? 1: 0;
	}

/*	Allocate, fill, and return cksumlens array of checksum lengths.
**	This array holds just the unique elements from the krb5_cksumarray[].
**	array[n] == 0 signals end of data.
**
**      The krb5_cksumarray[] was an internal variable that has since been
**      replaced by a more general method for storing the data.  It should
**      not be used.  Instead we use real API calls and make a guess for 
**      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
**      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
*/
size_t  *populate_cksumlens(void)
	{
	int 		i, j, n;
	static size_t 	*cklens = NULL;

#ifdef KRB5_MIT_OLD11
	n = krb5_max_cksum;
#else
	n = 0x0010;
#endif	/* KRB5_MIT_OLD11 */
 
#ifdef KRB5CHECKAUTH
	if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;

	for (i=0; i < n; i++)  {
		if (!valid_cksumtype(i))  continue;	/*  array has holes  */
		for (j=0; j < n; j++)  {
			if (cklens[j] == 0)  {
				cklens[j] = krb5_checksum_size(NULL,i);
				break;		/*  krb5 elem was new: add   */
				}
			if (cklens[j] == krb5_checksum_size(NULL,i))  {
				break;		/*  ignore duplicate elements */
				}
			}
		}
#endif	/* KRB5CHECKAUTH */

	return cklens;
	}

/*	Return pointer to start of real authenticator within authenticator, or
**	return NULL on error.
**	Decrypted authenticator looks like this:
**		[0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
**	This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
**	krb5_auth_con_getcksumtype() function advertised in its krb5.h.
*/
unsigned char	*kssl_skip_confound(krb5_enctype etype, unsigned char *a)
	{
	int 		i, conlen;
	size_t		cklen;
	static size_t 	*cksumlens = NULL;
	unsigned char	*test_auth;

	conlen = (etype)? 8: 0;

	if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
	for (i=0; (cklen = cksumlens[i]) != 0; i++)
		{
		test_auth = a + conlen + cklen;
		if (kssl_test_confound(test_auth))  return test_auth;
		}

	return NULL;
	}


/*	Set kssl_err error info when reason text is a simple string
**		kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
*/
void
kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
        {
	if (kssl_err == NULL)  return;

	kssl_err->reason = reason;
	BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
	return;
        }


/*	Display contents of krb5_data struct, for debugging
*/
void
print_krb5_data(char *label, krb5_data *kdata)
        {
	int i;

	printf("%s[%d] ", label, kdata->length);
	for (i=0; i < (int)kdata->length; i++)
                {
		if (0 &&  isprint((int) kdata->data[i]))
                        printf(	"%c ",  kdata->data[i]);
		else
                        printf(	"%02x ", (unsigned char) kdata->data[i]);
		}
	printf("\n");
        }


/*	Display contents of krb5_authdata struct, for debugging
*/
void
print_krb5_authdata(char *label, krb5_authdata **adata)
        {
	if (adata == NULL)
                {
		printf("%s, authdata==0\n", label);
		return;
		}
	printf("%s [%p]\n", label, (void *)adata);
#if 0
	{
        int 	i;
	printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
	for (i=0; i < adata->length; i++)
                {
                printf((isprint(adata->contents[i]))? "%c ": "%02x",
                        adata->contents[i]);
		}
	printf("\n");
	}
#endif
	}


/*	Display contents of krb5_keyblock struct, for debugging
*/
void
print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
        {
	int i;

	if (keyblk == NULL)
                {
		printf("%s, keyblk==0\n", label);
		return;
		}
#ifdef KRB5_HEIMDAL
	printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
					   keyblk->keyvalue->length);
	for (i=0; i < (int)keyblk->keyvalue->length; i++)
                {
		printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
		}
	printf("\n");
#else
	printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
	for (i=0; i < (int)keyblk->length; i++)
                {
		printf("%02x",keyblk->contents[i]);
		}
	printf("\n");
#endif
        }


/*	Display contents of krb5_principal_data struct, for debugging
**	(krb5_principal is typedef'd == krb5_principal_data *)
*/
void
print_krb5_princ(char *label, krb5_principal_data *princ)
        {
	int i, ui, uj;

	printf("%s principal Realm: ", label);
	if (princ == NULL)  return;
	for (ui=0; ui < (int)princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
	printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
	for (i=0; i < (int)princ->length; i++)
                {
		printf("\t%d [%d]: ", i, princ->data[i].length);
		for (uj=0; uj < (int)princ->data[i].length; uj++)  {
			putchar(princ->data[i].data[uj]);
			}
		printf("\n");
		}
	return;
        }


/*	Given krb5 service (typically "kssl") and hostname in kssl_ctx,
**	Return encrypted Kerberos ticket for service @ hostname.
**	If authenp is non-NULL, also return encrypted authenticator,
**	whose data should be freed by caller.
**	(Originally was: Create Kerberos AP_REQ message for SSL Client.)
**
**	19990628	VRS 	Started; Returns Kerberos AP_REQ message.
**	20010409	VRS 	Modified for RFC2712; Returns enc tkt.
**	20010606	VRS 	May also return optional authenticator.
*/
krb5_error_code
kssl_cget_tkt(	/* UPDATE */	KSSL_CTX *kssl_ctx,
                /* OUT    */	krb5_data **enc_ticketp,
                /* UPDATE */	krb5_data *authenp,
                /* OUT    */	KSSL_ERR *kssl_err)
	{
	krb5_error_code		krb5rc = KRB5KRB_ERR_GENERIC;
	krb5_context		krb5context = NULL;
	krb5_auth_context	krb5auth_context = NULL;
	krb5_ccache 		krb5ccdef = NULL;
	krb5_creds		krb5creds, *krb5credsp = NULL;
	krb5_data		krb5_app_req;

	kssl_err_set(kssl_err, 0, "");
	memset((char *)&krb5creds, 0, sizeof(krb5creds));

	if (!kssl_ctx)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "No kssl_ctx defined.\n");
		goto err;
		}
	else if (!kssl_ctx->service_host)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "kssl_ctx service_host undefined.\n");
		goto err;
		}

	if ((krb5rc = krb5_init_context(&krb5context)) != 0)
                {
		BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
                        "krb5_init_context() fails: %d\n", krb5rc);
		kssl_err->reason = SSL_R_KRB5_C_INIT;
		goto err;
		}

	if ((krb5rc = krb5_sname_to_principal(krb5context,
                kssl_ctx->service_host,
                (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
                KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
                {
		BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
                        "krb5_sname_to_principal() fails for %s/%s\n",
                        kssl_ctx->service_host,
                        (kssl_ctx->service_name)? kssl_ctx->service_name:
						  KRB5SVC);
		kssl_err->reason = SSL_R_KRB5_C_INIT;
		goto err;
		}

	if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
                        "krb5_cc_default fails.\n");
		goto err;
		}

	if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
                &krb5creds.client)) != 0)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
                        "krb5_cc_get_principal() fails.\n");
		goto err;
		}

	if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
                &krb5creds, &krb5credsp)) != 0)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
                        "krb5_get_credentials() fails.\n");
		goto err;
		}

	*enc_ticketp = &krb5credsp->ticket;
#ifdef KRB5_HEIMDAL
	kssl_ctx->enctype = krb5credsp->session.keytype;
#else
	kssl_ctx->enctype = krb5credsp->keyblock.enctype;
#endif

	krb5rc = KRB5KRB_ERR_GENERIC;
	/*	caller should free data of krb5_app_req  */
	/*  20010406 VRS deleted for real KerberosWrapper
	**  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
	*/
	krb5_app_req.length = 0;
	if (authenp)
                {
		krb5_data	krb5in_data;
		const unsigned char	*p;
		long		arlen;
		KRB5_APREQBODY	*ap_req;

		authenp->length = 0;
		krb5in_data.data = NULL;
		krb5in_data.length = 0;
		if ((krb5rc = krb5_mk_req_extended(krb5context,
			&krb5auth_context, 0, &krb5in_data, krb5credsp,
			&krb5_app_req)) != 0)
			{
			kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
				"krb5_mk_req_extended() fails.\n");
			goto err;
			}

		arlen = krb5_app_req.length;
		p = (unsigned char *)krb5_app_req.data;
		ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
		if (ap_req)
			{
			authenp->length = i2d_KRB5_ENCDATA(
					ap_req->authenticator, NULL);
			if (authenp->length  && 
				(authenp->data = malloc(authenp->length)))
				{
				unsigned char	*adp = (unsigned char *)authenp->data;
				authenp->length = i2d_KRB5_ENCDATA(
						ap_req->authenticator, &adp);
				}
			}

		if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
		if (krb5_app_req.length)  
                        kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
		}
#ifdef KRB5_HEIMDAL
	if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
                        "kssl_ctx_setkey() fails.\n");
		}
#else
	if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
                        "kssl_ctx_setkey() fails.\n");
		}
#endif
	else	krb5rc = 0;

 err:
#ifdef KSSL_DEBUG
	kssl_ctx_show(kssl_ctx);
#endif	/* KSSL_DEBUG */

	if (krb5creds.client)	krb5_free_principal(krb5context,
							krb5creds.client);
	if (krb5creds.server)	krb5_free_principal(krb5context,
							krb5creds.server);
	if (krb5auth_context)	krb5_auth_con_free(krb5context,
							krb5auth_context);
	if (krb5context)	krb5_free_context(krb5context);
	return (krb5rc);
	}


/*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
**  Return Kerberos error code and kssl_err struct on error.
**  Allocates krb5_ticket and krb5_principal; caller should free these.
**
**	20010410	VRS	Implemented krb5_decode_ticket() as
**				old_krb5_decode_ticket(). Missing from MIT1.0.6.
**	20010615	VRS 	Re-cast as openssl/asn1 d2i_*() functions.
**				Re-used some of the old krb5_decode_ticket()
**				code here.  This tkt should alloc/free just
**				like the real thing.
*/
krb5_error_code
kssl_TKT2tkt(	/* IN     */	krb5_context	krb5context,
		/* IN     */	KRB5_TKTBODY	*asn1ticket,
		/* OUT    */	krb5_ticket	**krb5ticket,
		/* OUT    */	KSSL_ERR *kssl_err  )
        {
        krb5_error_code			krb5rc = KRB5KRB_ERR_GENERIC;
	krb5_ticket 			*new5ticket = NULL;
	ASN1_GENERALSTRING		*gstr_svc, *gstr_host;

	*krb5ticket = NULL;

	if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
		asn1ticket->sname == NULL  || 
		sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
		{
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"Null field in asn1ticket.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		return KRB5KRB_ERR_GENERIC;
		}

	if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
		{
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"Unable to allocate new krb5_ticket.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		return ENOMEM;		/*  or  KRB5KRB_ERR_GENERIC;	*/
		}

	gstr_svc  = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
	gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);

	if ((krb5rc = kssl_build_principal_2(krb5context,
			&new5ticket->server,
			asn1ticket->realm->length, (char *)asn1ticket->realm->data,
			gstr_svc->length,  (char *)gstr_svc->data,
			gstr_host->length, (char *)gstr_host->data)) != 0)
		{
		free(new5ticket);
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"Error building ticket server principal.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		return krb5rc;		/*  or  KRB5KRB_ERR_GENERIC;	*/
		}

	krb5_princ_type(krb5context, new5ticket->server) =
			asn1ticket->sname->nametype->data[0];
	new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
	new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
	new5ticket->enc_part.ciphertext.length =
			asn1ticket->encdata->cipher->length;
	if ((new5ticket->enc_part.ciphertext.data =
		calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
		{
		free(new5ticket);
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"Error allocating cipher in krb5ticket.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		return KRB5KRB_ERR_GENERIC;
		}
	else
		{
		memcpy(new5ticket->enc_part.ciphertext.data,
			asn1ticket->encdata->cipher->data,
			asn1ticket->encdata->cipher->length);
		}

	*krb5ticket = new5ticket;
	return 0;
	}


/*	Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
**		and krb5 AP_REQ message & message length,
**	Return Kerberos session key and client principle
**		to SSL Server in KSSL_CTX *kssl_ctx.
**
**	19990702	VRS 	Started.
*/
krb5_error_code
kssl_sget_tkt(	/* UPDATE */	KSSL_CTX		*kssl_ctx,
		/* IN     */	krb5_data		*indata,
		/* OUT    */	krb5_ticket_times	*ttimes,
		/* OUT    */	KSSL_ERR		*kssl_err  )
        {
        krb5_error_code			krb5rc = KRB5KRB_ERR_GENERIC;
        static krb5_context		krb5context = NULL;
	static krb5_auth_context	krb5auth_context = NULL;
	krb5_ticket 			*krb5ticket = NULL;
	KRB5_TKTBODY 			*asn1ticket = NULL;
	const unsigned char		*p;
	krb5_keytab 			krb5keytab = NULL;
	krb5_keytab_entry		kt_entry;
	krb5_principal			krb5server;
        krb5_rcache                     rcache = NULL;

	kssl_err_set(kssl_err, 0, "");

	if (!kssl_ctx)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"No kssl_ctx defined.\n");
		goto err;
		}

#ifdef KSSL_DEBUG
	printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
#endif	/* KSSL_DEBUG */

	if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "krb5_init_context() fails.\n");
		goto err;
		}
	if (krb5auth_context  &&
		(krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "krb5_auth_con_free() fails.\n");
		goto err;
		}
	else  krb5auth_context = NULL;
	if (!krb5auth_context  &&
		(krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "krb5_auth_con_init() fails.\n");
		goto err;
		}

 
	if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
		&rcache)))
		{
 		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"krb5_auth_con_getrcache() fails.\n");
 		goto err;
		}
 
	if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
                (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
                KRB5_NT_SRV_HST, &krb5server)) != 0)
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "krb5_sname_to_principal() fails.\n");
		goto err;
		}

	if (rcache == NULL) 
                {
                if ((krb5rc = krb5_get_server_rcache(krb5context,
			krb5_princ_component(krb5context, krb5server, 0),
			&rcache)))
                        {
		        kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                                "krb5_get_server_rcache() fails.\n");
                  	goto err;
                        }
                }

        if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
                {
                kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"krb5_auth_con_setrcache() fails.\n");
                goto err;
                }


	/*	kssl_ctx->keytab_file == NULL ==> use Kerberos default
	*/
	if (kssl_ctx->keytab_file)
		{
		krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
                        &krb5keytab);
		if (krb5rc)
			{
			kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
				"krb5_kt_resolve() fails.\n");
			goto err;
			}
		}
	else
		{
                krb5rc = krb5_kt_default(krb5context,&krb5keytab);
                if (krb5rc)
			{
			kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 
				"krb5_kt_default() fails.\n");
			goto err;
			}
		}

	/*	Actual Kerberos5 krb5_recvauth() has initial conversation here
	**	o	check KRB5_SENDAUTH_BADAUTHVERS
	**		unless KRB5_RECVAUTH_SKIP_VERSION
	**	o	check KRB5_SENDAUTH_BADAPPLVERS
	**	o	send "0" msg if all OK
	*/

	/*  20010411 was using AP_REQ instead of true KerberosWrapper
	**
	**  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
	**			&krb5in_data, krb5server, krb5keytab,
	**			&ap_option, &krb5ticket)) != 0)  { Error }
	*/

	p = (unsigned char *)indata->data;
	if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
						(long) indata->length)) == NULL)
		{
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"d2i_KRB5_TICKET() ASN.1 decode failure.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}
	
	/* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
	if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
					kssl_err)) != 0)
		{
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"Error converting ASN.1 ticket to krb5_ticket.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}

	if (! krb5_principal_compare(krb5context, krb5server,
						  krb5ticket->server))  {
		krb5rc = KRB5_PRINC_NOMATCH;
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"server principal != ticket principal\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}
	if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
			krb5ticket->server, krb5ticket->enc_part.kvno,
			krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"krb5_kt_get_entry() fails with %x.\n", krb5rc);
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}
	if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
			krb5ticket)) != 0)  {
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
			"krb5_decrypt_tkt_part() failed.\n");
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}
	else  {
		krb5_kt_free_entry(krb5context, &kt_entry);
#ifdef KSSL_DEBUG
		{
		int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
		printf("Decrypted ticket fields:\n");
		printf("\tflags: %X, transit-type: %X",
			krb5ticket->enc_part2->flags,
			krb5ticket->enc_part2->transited.tr_type);
		print_krb5_data("\ttransit-data: ",
			&(krb5ticket->enc_part2->transited.tr_contents));
		printf("\tcaddrs: %p, authdata: %p\n",
			krb5ticket->enc_part2->caddrs,
			krb5ticket->enc_part2->authorization_data);
		if (paddr)
			{
			printf("\tcaddrs:\n");
			for (i=0; paddr[i] != NULL; i++)
				{
				krb5_data d;
				d.length=paddr[i]->length;
				d.data=paddr[i]->contents;
				print_krb5_data("\t\tIP: ", &d);
				}
			}
		printf("\tstart/auth/end times: %d / %d / %d\n",
			krb5ticket->enc_part2->times.starttime,
			krb5ticket->enc_part2->times.authtime,
			krb5ticket->enc_part2->times.endtime);
		}
#endif	/* KSSL_DEBUG */
		}

	krb5rc = KRB5_NO_TKT_SUPPLIED;
	if (!krb5ticket  ||	!krb5ticket->enc_part2  ||
                !krb5ticket->enc_part2->client  ||
                !krb5ticket->enc_part2->client->data  ||
                !krb5ticket->enc_part2->session)
                {
                kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
                        "bad ticket from krb5_rd_req.\n");
		}
	else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
		 &krb5ticket->enc_part2->client->realm,
		 krb5ticket->enc_part2->client->data,
		 krb5ticket->enc_part2->client->length))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
                        "kssl_ctx_setprinc() fails.\n");
		}
	else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
                        "kssl_ctx_setkey() fails.\n");
		}
	else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
                {
		krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
                kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
                        "invalid ticket from krb5_rd_req.\n");
		}
	else	krb5rc = 0;

	kssl_ctx->enctype	= krb5ticket->enc_part.enctype;
	ttimes->authtime	= krb5ticket->enc_part2->times.authtime;
	ttimes->starttime	= krb5ticket->enc_part2->times.starttime;
	ttimes->endtime 	= krb5ticket->enc_part2->times.endtime;
	ttimes->renew_till	= krb5ticket->enc_part2->times.renew_till;

 err:
#ifdef KSSL_DEBUG
	kssl_ctx_show(kssl_ctx);
#endif	/* KSSL_DEBUG */

	if (asn1ticket) 	KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
        if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
	if (krb5ticket) 	krb5_free_ticket(krb5context, krb5ticket);
	if (krb5server) 	krb5_free_principal(krb5context, krb5server);
	return (krb5rc);
        }


/*	Allocate & return a new kssl_ctx struct.
*/
KSSL_CTX	*
kssl_ctx_new(void)
        {
	return ((KSSL_CTX *) kssl_calloc(1, sizeof(KSSL_CTX)));
        }


/*	Frees a kssl_ctx struct and any allocated memory it holds.
**	Returns NULL.
*/
KSSL_CTX	*
kssl_ctx_free(KSSL_CTX *kssl_ctx)
        {
	if (kssl_ctx == NULL)  return kssl_ctx;

	if (kssl_ctx->key)  		OPENSSL_cleanse(kssl_ctx->key,
							      kssl_ctx->length);
	if (kssl_ctx->key)  		kssl_free(kssl_ctx->key);
	if (kssl_ctx->client_princ) 	kssl_free(kssl_ctx->client_princ);
	if (kssl_ctx->service_host) 	kssl_free(kssl_ctx->service_host);
	if (kssl_ctx->service_name) 	kssl_free(kssl_ctx->service_name);
	if (kssl_ctx->keytab_file) 	kssl_free(kssl_ctx->keytab_file);

	kssl_free(kssl_ctx);
	return (KSSL_CTX *) NULL;
        }


/*	Given an array of (krb5_data *) entity (and optional realm),
**	set the plain (char *) client_princ or service_host member
**	of the kssl_ctx struct.
*/
krb5_error_code
kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
        krb5_data *realm, krb5_data *entity, int nentities)
        {
	char	**princ;
	int 	length;
	int i;

	if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;

	switch (which)
                {
        case KSSL_CLIENT:	princ = &kssl_ctx->client_princ;	break;
        case KSSL_SERVER:	princ = &kssl_ctx->service_host;	break;
        default:		return KSSL_CTX_ERR;			break;
		}
	if (*princ)  kssl_free(*princ);

	/* Add up all the entity->lengths */
	length = 0;
	for (i=0; i < nentities; i++)
		{
		length += entity[i].length;
		}
	/* Add in space for the '/' character(s) (if any) */
	length += nentities-1;
	/* Space for the ('@'+realm+NULL | NULL) */
	length += ((realm)? realm->length + 2: 1);

	if ((*princ = kssl_calloc(1, length)) == NULL)
		return KSSL_CTX_ERR;
	else
		{
		for (i = 0; i < nentities; i++)
			{
			strncat(*princ, entity[i].data, entity[i].length);
			if (i < nentities-1)
				{
				strcat (*princ, "/");
				}
			}
		if (realm)
                        {
			strcat (*princ, "@");
			(void) strncat(*princ, realm->data, realm->length);
			}
		}

	return KSSL_CTX_OK;
        }


/*	Set one of the plain (char *) string members of the kssl_ctx struct.
**	Default values should be:
**		which == KSSL_SERVICE	=>	"khost" (KRB5SVC)
**		which == KSSL_KEYTAB	=>	"/etc/krb5.keytab" (KRB5KEYTAB)
*/
krb5_error_code
kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
        {
	char	**string;

	if (!kssl_ctx)  return KSSL_CTX_ERR;

	switch (which)
                {
        case KSSL_SERVICE:	string = &kssl_ctx->service_name;	break;
        case KSSL_SERVER:	string = &kssl_ctx->service_host;	break;
        case KSSL_CLIENT:	string = &kssl_ctx->client_princ;	break;
        case KSSL_KEYTAB:	string = &kssl_ctx->keytab_file;	break;
        default:		return KSSL_CTX_ERR;			break;
		}
	if (*string)  kssl_free(*string);

	if (!text)
                {
		*string = '\0';
		return KSSL_CTX_OK;
		}

	if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL)
		return KSSL_CTX_ERR;
	else
		strcpy(*string, text);

	return KSSL_CTX_OK;
        }


/*	Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
**	struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
*/
krb5_error_code
kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
        {
	int 		length;
	krb5_enctype	enctype;
	krb5_octet FAR	*contents = NULL;

	if (!kssl_ctx)  return KSSL_CTX_ERR;

	if (kssl_ctx->key)
                {
		OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
		kssl_free(kssl_ctx->key);
		}

	if (session)
                {

#ifdef KRB5_HEIMDAL
		length = session->keyvalue->length;
		enctype = session->keytype;
		contents = session->keyvalue->contents;
#else
		length = session->length;
		enctype = session->enctype;
		contents = session->contents;
#endif
		kssl_ctx->enctype = enctype;
		kssl_ctx->length  = length;
		}
	else
                {
		kssl_ctx->enctype = ENCTYPE_UNKNOWN;
		kssl_ctx->length  = 0;
		return KSSL_CTX_OK;
		}

	if ((kssl_ctx->key =
                (krb5_octet FAR *) kssl_calloc(1, kssl_ctx->length)) == NULL)
                {
		kssl_ctx->length  = 0;
		return KSSL_CTX_ERR;
		}
	else
		memcpy(kssl_ctx->key, contents, length);

	return KSSL_CTX_OK;
        }


/*	Display contents of kssl_ctx struct
*/
void
kssl_ctx_show(KSSL_CTX *kssl_ctx)
        {
	int 	i;

	printf("kssl_ctx: ");
	if (kssl_ctx == NULL)
                {
		printf("NULL\n");
		return;
		}
	else
		printf("%p\n", (void *)kssl_ctx);

	printf("\tservice:\t%s\n",
                (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
	printf("\tclient:\t%s\n",
                (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
	printf("\tserver:\t%s\n",
                (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
	printf("\tkeytab:\t%s\n",
                (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
	printf("\tkey [%d:%d]:\t",
                kssl_ctx->enctype, kssl_ctx->length);

	for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
                {
		printf("%02x", kssl_ctx->key[i]);
		}
	printf("\n");
	return;
        }

    int 
    kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
{
    krb5_context		krb5context = NULL;
    krb5_keytab 		krb5keytab = NULL;
    krb5_keytab_entry           entry;
    krb5_principal              princ = NULL;
    krb5_error_code  		krb5rc = KRB5KRB_ERR_GENERIC;
    int rc = 0;

    if ((krb5rc = krb5_init_context(&krb5context)))
        return(0);

    /*	kssl_ctx->keytab_file == NULL ==> use Kerberos default
    */
    if (kssl_ctx->keytab_file)
    {
        krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
                                  &krb5keytab);
        if (krb5rc)
            goto exit;
    }
    else
    {
        krb5rc = krb5_kt_default(krb5context,&krb5keytab);
        if (krb5rc)
            goto exit;
    }

    /* the host key we are looking for */
    krb5rc = krb5_sname_to_principal(krb5context, NULL, 
                                     kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
                                     KRB5_NT_SRV_HST, &princ);

    krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 
                                princ,
                                0 /* IGNORE_VNO */,
                                0 /* IGNORE_ENCTYPE */,
                                &entry);
    if ( krb5rc == KRB5_KT_NOTFOUND ) {
        rc = 1;
        goto exit;
    } else if ( krb5rc )
        goto exit;
    
    krb5_kt_free_entry(krb5context, &entry);
    rc = 1;

  exit:
    if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
    if (princ)          krb5_free_principal(krb5context, princ);
    if (krb5context)	krb5_free_context(krb5context);
    return(rc);
}

int 
kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
        {
        krb5_error_code		krb5rc = KRB5KRB_ERR_GENERIC;
        krb5_context		krb5context = NULL;
        krb5_ccache 		krb5ccdef = NULL;
        krb5_creds		krb5creds, *krb5credsp = NULL;
        int                     rc = 0;

        memset((char *)&krb5creds, 0, sizeof(krb5creds));

        if (!kssl_ctx)
            return(0);

        if (!kssl_ctx->service_host)
            return(0);

        if ((krb5rc = krb5_init_context(&krb5context)) != 0)
            goto err;

        if ((krb5rc = krb5_sname_to_principal(krb5context,
                                              kssl_ctx->service_host,
                                              (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
                                              KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
            goto err;

        if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
            goto err;

        if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
                                             &krb5creds.client)) != 0)
            goto err;

        if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
                                            &krb5creds, &krb5credsp)) != 0)
            goto err;

        rc = 1;

      err:
#ifdef KSSL_DEBUG
	kssl_ctx_show(kssl_ctx);
#endif	/* KSSL_DEBUG */

	if (krb5creds.client)	krb5_free_principal(krb5context, krb5creds.client);
	if (krb5creds.server)	krb5_free_principal(krb5context, krb5creds.server);
	if (krb5context)	krb5_free_context(krb5context);
        return(rc);
	}

#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
	{
#ifdef KRB5_HEIMDAL
	data->length = 0;
        if (data->data)
            free(data->data);
#elif defined(KRB5_MIT_OLD11)
	if (data->data)  {
		krb5_xfree(data->data);
		data->data = 0;
		}
#else
	krb5_free_data_contents(NULL, data);
#endif
	}
#endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */


/*  Given pointers to KerberosTime and struct tm structs, convert the
**  KerberosTime string to struct tm.  Note that KerberosTime is a
**  ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
**  seconds as defined in RFC 1510.
**  Return pointer to the (partially) filled in struct tm on success,
**  return NULL on failure.
*/
struct tm	*k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
	{
	char 		c, *p;

	if (!k_tm)  return NULL;
	if (gtime == NULL  ||  gtime->length < 14)  return NULL;
	if (gtime->data == NULL)  return NULL;

	p = (char *)&gtime->data[14];

	c = *p;	 *p = '\0';  p -= 2;  k_tm->tm_sec  = atoi(p);      *(p+2) = c;
	c = *p;	 *p = '\0';  p -= 2;  k_tm->tm_min  = atoi(p);      *(p+2) = c;
	c = *p;	 *p = '\0';  p -= 2;  k_tm->tm_hour = atoi(p);      *(p+2) = c;
	c = *p;	 *p = '\0';  p -= 2;  k_tm->tm_mday = atoi(p);      *(p+2) = c;
	c = *p;	 *p = '\0';  p -= 2;  k_tm->tm_mon  = atoi(p)-1;    *(p+2) = c;
	c = *p;	 *p = '\0';  p -= 4;  k_tm->tm_year = atoi(p)-1900; *(p+4) = c;

	return k_tm;
	}


/*  Helper function for kssl_validate_times().
**  We need context->clockskew, but krb5_context is an opaque struct.
**  So we try to sneek the clockskew out through the replay cache.
**	If that fails just return a likely default (300 seconds).
*/
krb5_deltat	get_rc_clockskew(krb5_context context)
	{
	krb5_rcache 	rc;
	krb5_deltat 	clockskew;

	if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
	if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
	if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
		clockskew = KSSL_CLOCKSKEW;
		}
	(void) krb5_rc_destroy(context, rc);
	return clockskew;
	}


/*  kssl_validate_times() combines (and more importantly exposes)
**  the MIT KRB5 internal function krb5_validate_times() and the
**  in_clock_skew() macro.  The authenticator client time is checked
**  to be within clockskew secs of the current time and the current
**  time is checked to be within the ticket start and expire times.
**  Either check may be omitted by supplying a NULL value.
**  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
**  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
**  20010420 VRS
*/
krb5_error_code  kssl_validate_times(	krb5_timestamp atime,
					krb5_ticket_times *ttimes)
	{
	krb5_deltat 	skew;
	krb5_timestamp	start, now;
	krb5_error_code	rc;
	krb5_context	context;

	if ((rc = krb5_init_context(&context)))	 return SSL_R_KRB5_S_BAD_TICKET;
	skew = get_rc_clockskew(context); 
	if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
	krb5_free_context(context);

	if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;

	if (! ttimes)  return 0;

	start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
	if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
	if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;

#ifdef KSSL_DEBUG
	printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
		start, atime, now, skew, ttimes->endtime);
#endif	/* KSSL_DEBUG */

	return 0;
	}


/*  Decode and decrypt given DER-encoded authenticator, then pass
**  authenticator ctime back in *atimep (or 0 if time unavailable).
**  Returns krb5_error_code and kssl_err on error.  A NULL 
**  authenticator (authentp->length == 0) is not considered an error.
**  Note that kssl_check_authent() makes use of the KRB5 session key;
**  you must call kssl_sget_tkt() to get the key before calling this routine.
*/
krb5_error_code  kssl_check_authent(
			/* IN     */	KSSL_CTX	*kssl_ctx,
                        /* IN     */   	krb5_data	*authentp,
			/* OUT    */	krb5_timestamp	*atimep,
			/* OUT    */    KSSL_ERR	*kssl_err  )
	{
        krb5_error_code		krb5rc = 0;
	KRB5_ENCDATA		*dec_authent = NULL;
	KRB5_AUTHENTBODY	*auth = NULL;
	krb5_enctype		enctype;
	EVP_CIPHER_CTX		ciph_ctx;
	const EVP_CIPHER	*enc = NULL;
	unsigned char		iv[EVP_MAX_IV_LENGTH];
	const unsigned char	*p;
	unsigned char		*unenc_authent;
	int 			outl, unencbufsize;
	struct tm		tm_time, *tm_l, *tm_g;
	time_t			now, tl, tg, tr, tz_offset;

	EVP_CIPHER_CTX_init(&ciph_ctx);
	*atimep = 0;
	kssl_err_set(kssl_err, 0, "");

#ifndef KRB5CHECKAUTH
	authentp = NULL;
#else
#if	KRB5CHECKAUTH == 0
	authentp = NULL;
#endif
#endif	/* KRB5CHECKAUTH */

	if (authentp == NULL  ||  authentp->length == 0)  return 0;

#ifdef KSSL_DEBUG
        {
        unsigned int ui;
	printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
	p = authentp->data; 
	for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
	printf("\n");
        }
#endif	/* KSSL_DEBUG */

	unencbufsize = 2 * authentp->length;
	if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"Unable to allocate authenticator buffer.\n");
		krb5rc = KRB5KRB_ERR_GENERIC;
		goto err;
		}

	p = (unsigned char *)authentp->data;
	if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
					(long) authentp->length)) == NULL) 
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "Error decoding authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}

	enctype = dec_authent->etype->data[0];	/* should = kssl_ctx->enctype */
#if !defined(KRB5_MIT_OLD11)
            switch ( enctype ) {
            case ENCTYPE_DES3_CBC_SHA1:		/*    EVP_des_ede3_cbc();  */
            case ENCTYPE_DES3_CBC_SHA:
            case ENCTYPE_DES3_CBC_RAW:
                krb5rc = 0;                     /* Skip, can't handle derived keys */
                goto err;
            }
#endif
	enc = kssl_map_enc(enctype);
	memset(iv, 0, sizeof iv);       /* per RFC 1510 */

	if (enc == NULL)
		{
		/*  Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
		**  This enctype indicates the authenticator was encrypted
		**  using key-usage derived keys which openssl cannot decrypt.
		*/
		goto err;
		}

        if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
                {
                kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "EVP_CipherInit error decrypting authenticator.\n");
                krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
                goto err;
                }
        outl = dec_authent->cipher->length;
        if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
                {
                kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "EVP_Cipher error decrypting authenticator.\n");
                krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
                goto err;
                }
        EVP_CIPHER_CTX_cleanup(&ciph_ctx);

#ifdef KSSL_DEBUG
	printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
	for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
	printf("\n");
#endif	/* KSSL_DEBUG */

	if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "confounded by authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}
	outl -= p - unenc_authent;

	if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
							  (long) outl))==NULL)
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "Error decoding authenticator body.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}

	memset(&tm_time,0,sizeof(struct tm));
	if (k_gmtime(auth->ctime, &tm_time)  &&
		((tr = mktime(&tm_time)) != (time_t)(-1)))
 		{
 		now  = time(&now);
 		tm_l = localtime(&now); 	tl = mktime(tm_l);
 		tm_g = gmtime(&now);		tg = mktime(tm_g);
 		tz_offset = tg - tl;

		*atimep = tr - tz_offset;
 		}

#ifdef KSSL_DEBUG
	printf("kssl_check_authent: returns %d for client time ", *atimep);
	if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
		printf("%.*s\n", auth->ctime->length, auth->ctime->data);
	else	printf("NULL\n");
#endif	/* KSSL_DEBUG */

 err:
	if (auth)		KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
	if (dec_authent)	KRB5_ENCDATA_free(dec_authent);
	if (unenc_authent)	free(unenc_authent);
	EVP_CIPHER_CTX_cleanup(&ciph_ctx);
	return krb5rc;
	}


/*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
**  because I dont't know how to stub varargs.
**  Returns krb5_error_code == ENOMEM on alloc error, otherwise
**  passes back newly constructed principal, which should be freed by caller.
*/
krb5_error_code  kssl_build_principal_2(
			/* UPDATE */	krb5_context	context,
			/* OUT    */	krb5_principal	*princ,
			/* IN     */	int rlen,  const char *realm,
			/* IN	  */	int slen,  const char *svc,
			/* IN	  */	int hlen,  const char *host)
	{
	krb5_data		*p_data = NULL;
	krb5_principal		new_p = NULL;
        char			*new_r = NULL;

	if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
	    (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
			== NULL)  goto err;
	new_p->length = 2;
	new_p->data = p_data;

	if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
	memcpy(new_r, realm, rlen);
	krb5_princ_set_realm_length(context, new_p, rlen);
	krb5_princ_set_realm_data(context, new_p, new_r);

	if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
	memcpy(new_p->data[0].data, svc, slen);
	new_p->data[0].length = slen;

	if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
	memcpy(new_p->data[1].data, host, hlen);
	new_p->data[1].length = hlen;
	
	krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
	*princ = new_p;
	return 0;

 err:
	if (new_p  &&  new_p[0].data)	free(new_p[0].data);
	if (new_p  &&  new_p[1].data)	free(new_p[1].data);
	if (new_p)	free(new_p);
	if (new_r)	free(new_r);
	return ENOMEM;
	}


#else /* !OPENSSL_NO_KRB5 */

#if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
static void *dummy=&dummy;
#endif

#endif	/* !OPENSSL_NO_KRB5	*/