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[netbsd-mini2440.git] / crypto / external / bsd / openssl / dist / ssl / kssl.c

/* 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>

#include <string.h>

#define KRB5_PRIVATE    1

#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/krb5_asn.h>
#include "kssl_lcl.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.
*/
static 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.
*/
static 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, "%s", 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 *)
*/
static 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.
*/
static 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.
*/
static 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).
*/
static 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 = (krb5_timestamp)(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     */