kssl.c 65.9 KB
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/* 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).
 *
 */


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/*  ssl/kssl.c  --  Routines to support (& debug) Kerberos5 auth for openssl
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**
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**  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.
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*/

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Ulf Möller 已提交
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_KRB5
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#define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */
#include <time.h>
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#include <string.h>
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#include <openssl/ssl.h>
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#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/krb5_asn.h>
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/* 
 * 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.
 */

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#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
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/* 
 * 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           
#define krb5_auth_con_init       kssl_krb5_auth_con_init        

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#define krb5_principal_compare   kssl_krb5_principal_compare
/* macro  #define krb5_kt_get_entry        kssl_krb5_kt_get_entry  */
#define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
#define krb5_timeofday           kssl_krb5_timeofday
#define krb5_rc_default           kssl_krb5_rc_default
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#define krb5_rc_initialize   kssl_krb5_rc_initialize
#define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
#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
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#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
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/* 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 **);
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krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
                                         krb5_const_principal);
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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);
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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 * );
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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 *);
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/* Function pointers (almost all Kerberos functions are _stdcall) */
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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;
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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;
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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;
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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;
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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;
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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;
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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;
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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("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" );
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	(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" );
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	(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" );
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        (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" );
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        (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" );
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	}

/* 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;
	}

508 509 510 511 512 513 514 515
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 )
516
		return(p_krb5_principal_compare(con,princ1,princ2));
517 518 519 520 521 522 523 524 525 526 527 528
	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 )
529
		return(p_krb5_decrypt_tkt_part(con,keys,ticket));
530 531 532 533 534 535 536 537 538 539 540
	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 )
541
		return(p_krb5_timeofday(con,timeret));
542 543 544 545 546 547 548 549 550 551 552
	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 )
553
		return(p_krb5_rc_default(con,rc));
554 555 556 557 558 559 560 561 562 563 564
	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 )
565
		return(p_krb5_rc_initialize(con, rc, lifespan));
566 567 568 569 570 571 572 573 574 575 576
	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 )
577
		return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
578 579 580 581 582 583 584 585 586 587 588
	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 )
589
		return(p_krb5_rc_destroy(con, rc));
590 591 592 593
	else
		return KRB5KRB_ERR_GENERIC;
	}

594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
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;
        }
                 
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
/* 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;
650
	char  * (KRB5_CALLCONV *get_name)
651
		(krb5_context, krb5_ccache);
652
	krb5_error_code (KRB5_CALLCONV *resolve)
653
		(krb5_context, krb5_ccache  *, const char  *);
654
	krb5_error_code (KRB5_CALLCONV *gen_new)
655
		(krb5_context, krb5_ccache  *);
656
	krb5_error_code (KRB5_CALLCONV *init)
657
		(krb5_context, krb5_ccache, krb5_principal);
658
	krb5_error_code (KRB5_CALLCONV *destroy)
659
		(krb5_context, krb5_ccache);
660
	krb5_error_code (KRB5_CALLCONV *close)
661
		(krb5_context, krb5_ccache);
662
	krb5_error_code (KRB5_CALLCONV *store)
663
		(krb5_context, krb5_ccache, krb5_creds  *);
664
	krb5_error_code (KRB5_CALLCONV *retrieve)
665 666
		(krb5_context, krb5_ccache,
		krb5_flags, krb5_creds  *, krb5_creds  *);
667
	krb5_error_code (KRB5_CALLCONV *get_princ)
668
		(krb5_context, krb5_ccache, krb5_principal  *);
669
	krb5_error_code (KRB5_CALLCONV *get_first)
670
		(krb5_context, krb5_ccache, krb5_cc_cursor  *);
671
	krb5_error_code (KRB5_CALLCONV *get_next)
672 673
		(krb5_context, krb5_ccache,
		krb5_cc_cursor  *, krb5_creds  *);
674
	krb5_error_code (KRB5_CALLCONV *end_get)
675
		(krb5_context, krb5_ccache, krb5_cc_cursor  *);
676
	krb5_error_code (KRB5_CALLCONV *remove_cred)
677 678
		(krb5_context, krb5_ccache,
		krb5_flags, krb5_creds  *);
679
	krb5_error_code (KRB5_CALLCONV *set_flags)
680
		(krb5_context, krb5_ccache, krb5_flags);
681 682 683 684 685 686 687 688 689 690 691
	} 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
692 693
		return(krb5_x
			((cache)->ops->get_princ,(context, cache, principal)));
694
	}
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724

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;
        }
725
#endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
726

727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
char
*kstring(char *string)
        {
        static char	*null = "[NULL]";

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

#define	MAXKNUM	255
char
*knumber(int len, krb5_octet *contents)
        {
	static char	buf[MAXKNUM+1];
	int 		i;

	BIO_snprintf(buf, MAXKNUM, "[%d] ", len);

	for (i=0; i < len  &&  MAXKNUM > strlen(buf)+3; i++)
                {
                BIO_snprintf(&buf[strlen(buf)], 3, "%02x", contents[i]);
                }

	return (buf);
750
	}
751 752


753 754 755 756
/*	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.
757 758 759 760 761 762
*/
EVP_CIPHER *
kssl_map_enc(krb5_enctype enctype)
        {
	switch (enctype)
		{
763
	case ENCTYPE_DES_HMAC_SHA1:		/*    EVP_des_cbc();       */
764 765 766 767 768 769
	case ENCTYPE_DES_CBC_CRC:
	case ENCTYPE_DES_CBC_MD4:
	case ENCTYPE_DES_CBC_MD5:
	case ENCTYPE_DES_CBC_RAW:
				return (EVP_CIPHER *) EVP_des_cbc();
				break;
770
	case ENCTYPE_DES3_CBC_SHA1:		/*    EVP_des_ede3_cbc();  */
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
	case ENCTYPE_DES3_CBC_SHA:
	case ENCTYPE_DES3_CBC_RAW:
				return (EVP_CIPHER *) EVP_des_ede3_cbc();
				break;
	default:                return (EVP_CIPHER *) 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.
814 815 816 817 818 819
**
**      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.
820 821 822
*/
int 	*populate_cksumlens(void)
	{
823
	int 		i, j, n;
824
	static size_t 	*cklens = NULL;
825

826 827 828 829 830 831
#ifdef KRB5_MIT_OLD11
	n = krb5_max_cksum;
#else
	n = 0x0010;
#endif	/* KRB5_MIT_OLD11 */
 
832
#ifdef KRB5CHECKAUTH
833
	if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;
834

835 836 837
	for (i=0; i < n; i++)  {
		if (!valid_cksumtype(i))  continue;	/*  array has holes  */
		for (j=0; j < n; j++)  {
838
			if (cklens[j] == 0)  {
839
				cklens[j] = krb5_checksum_size(NULL,i);
840 841
				break;		/*  krb5 elem was new: add   */
				}
842
			if (cklens[j] == krb5_checksum_size(NULL,i))  {
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
				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, cklen, conlen;
	static int 	*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;
	}


878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
/*	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)
        {
897
	unsigned int 	i;
898 899 900 901

	printf("%s[%d] ", label, kdata->length);
	for (i=0; i < kdata->length; i++)
                {
902
		if (0 &&  isprint((int) kdata->data[i]))
903 904
                        printf(	"%c ",  kdata->data[i]);
		else
905
                        printf(	"%02x ", (unsigned char) kdata->data[i]);
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
		}
	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, 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
934
	}
935 936 937 938 939 940 941


/*	Display contents of krb5_keyblock struct, for debugging
*/
void
print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
        {
942
	unsigned int 	i;
943 944 945 946 947 948

	if (keyblk == NULL)
                {
		printf("%s, keyblk==0\n", label);
		return;
		}
949
#ifdef KRB5_HEIMDAL
950 951
	printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
					   keyblk->keyvalue->length);
952 953 954 955 956 957
	for (i=0; i < keyblk->keyvalue->length; i++)
                {
		printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
		}
	printf("\n");
#else
958 959 960 961 962 963
	printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
	for (i=0; i < keyblk->length; i++)
                {
		printf("%02x",keyblk->contents[i]);
		}
	printf("\n");
964
#endif
965 966 967
        }


968 969 970 971 972 973
/*	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)
        {
974 975
	unsigned int 	ui, uj;
        int i;
976 977 978

	printf("%s principal Realm: ", label);
	if (princ == NULL)  return;
979
	for (ui=0; ui < princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
980 981 982 983
	printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
	for (i=0; i < princ->length; i++)
                {
		printf("\t%d [%d]: ", i, princ->data[i].length);
984 985
		for (uj=0; uj < princ->data[i].length; uj++)  {
			putchar(princ->data[i].data[uj]);
986 987 988 989 990 991 992
			}
		printf("\n");
		}
	return;
        }


993
/*	Given krb5 service (typically "kssl") and hostname in kssl_ctx,
994 995 996 997
**	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.)
998
**
999 1000 1001
**	19990628	VRS 	Started; Returns Kerberos AP_REQ message.
**	20010409	VRS 	Modified for RFC2712; Returns enc tkt.
**	20010606	VRS 	May also return optional authenticator.
1002 1003 1004
*/
krb5_error_code
kssl_cget_tkt(	/* UPDATE */	KSSL_CTX *kssl_ctx,
1005 1006 1007
                /* OUT    */	krb5_data **enc_ticketp,
                /* UPDATE */	krb5_data *authenp,
                /* OUT    */	KSSL_ERR *kssl_err)
1008
	{
1009 1010 1011 1012 1013
	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;
1014
	krb5_data		krb5_app_req;
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047

	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,
1048 1049
                        (kssl_ctx->service_name)? kssl_ctx->service_name:
						  KRB5SVC);
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
		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;
		}

1077 1078 1079 1080 1081 1082
	*enc_ticketp = &krb5credsp->ticket;
#ifdef KRB5_HEIMDAL
	kssl_ctx->enctype = krb5credsp->session.keytype;
#else
	kssl_ctx->enctype = krb5credsp->keyblock.enctype;
#endif
1083 1084 1085

	krb5rc = KRB5KRB_ERR_GENERIC;
	/*	caller should free data of krb5_app_req  */
1086 1087 1088 1089 1090
	/*  20010406 VRS deleted for real KerberosWrapper
	**  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
	*/
	krb5_app_req.length = 0;
	if (authenp)
1091
                {
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
		krb5_data	krb5in_data;
		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 = 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	*p = authenp->data;
				authenp->length = i2d_KRB5_ENCDATA(
						ap_req->authenticator, &p);
				}
			}

		if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1126
		if (krb5_app_req.length)  
1127
                        kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1128
		}
1129
#ifdef KRB5_HEIMDAL
1130
	if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1131 1132 1133 1134 1135
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
                        "kssl_ctx_setkey() fails.\n");
		}
#else
1136
	if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1137 1138 1139 1140
                {
		kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
                        "kssl_ctx_setkey() fails.\n");
		}
1141
#endif
1142 1143 1144 1145 1146 1147 1148
	else	krb5rc = 0;

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

1149 1150 1151 1152 1153 1154
	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);
1155 1156
	if (krb5context)	krb5_free_context(krb5context);
	return (krb5rc);
1157
	}
1158 1159


1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
/*  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  || 
		asn1ticket->sname->namestring == NULL  ||
		asn1ticket->sname->namestring->num < 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  = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[0];
	gstr_host = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[1];

	if ((krb5rc = kssl_build_principal_2(krb5context,
			&new5ticket->server,
			asn1ticket->realm->length, asn1ticket->realm->data,
			gstr_svc->length,  gstr_svc->data,
			gstr_host->length, 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;
	}


1245 1246 1247 1248 1249 1250 1251 1252
/*	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
1253 1254 1255 1256
kssl_sget_tkt(	/* UPDATE */	KSSL_CTX		*kssl_ctx,
		/* IN     */	krb5_data		*indata,
		/* OUT    */	krb5_ticket_times	*ttimes,
		/* OUT    */	KSSL_ERR		*kssl_err  )
1257 1258 1259 1260 1261
        {
        krb5_error_code			krb5rc = KRB5KRB_ERR_GENERIC;
        static krb5_context		krb5context = NULL;
	static krb5_auth_context	krb5auth_context = NULL;
	krb5_ticket 			*krb5ticket = NULL;
1262 1263
	KRB5_TKTBODY 			*asn1ticket = NULL;
	unsigned char			*p;
1264
	krb5_keytab 			krb5keytab = NULL;
1265
	krb5_keytab_entry		kt_entry;
1266
	krb5_principal			krb5server;
1267
        krb5_rcache                     rcache = NULL;
1268 1269 1270 1271 1272

	kssl_err_set(kssl_err, 0, "");

	if (!kssl_ctx)
                {
1273
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1274
			"No kssl_ctx defined.\n");
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
		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;
		}

1304 1305 1306 1307 1308 1309 1310 1311 1312
 
	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;
		}
 
1313 1314 1315 1316 1317 1318 1319 1320 1321
	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;
		}

1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
	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;
                }


1342
	/*	kssl_ctx->keytab_file == NULL ==> use Kerberos default
1343
	*/
1344 1345 1346 1347
	if (kssl_ctx->keytab_file)
		{
		krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
                        &krb5keytab);
R
Richard Levitte 已提交
1348
		if (krb5rc)
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
			{
			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;
			}
		}
1365 1366

	/*	Actual Kerberos5 krb5_recvauth() has initial conversation here
1367 1368
	**	o	check KRB5_SENDAUTH_BADAUTHVERS
	**		unless KRB5_RECVAUTH_SKIP_VERSION
1369 1370 1371 1372
	**	o	check KRB5_SENDAUTH_BADAPPLVERS
	**	o	send "0" msg if all OK
	*/

1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
	/*  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 = 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)  {
1411
		BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1412
			"krb5_kt_get_entry() fails with %x.\n", krb5rc);
1413 1414 1415
		kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
		goto err;
		}
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	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);
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
		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);
				}
1447 1448 1449 1450 1451 1452 1453 1454
			}
		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 */
		}
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476

	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))
                {
		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");
		}
1477 1478 1479 1480 1481 1482
	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");
		}
1483 1484
	else	krb5rc = 0;

1485 1486 1487 1488 1489 1490
	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;

1491 1492 1493 1494 1495
 err:
#ifdef KSSL_DEBUG
	kssl_ctx_show(kssl_ctx);
#endif	/* KSSL_DEBUG */

1496
	if (asn1ticket) 	KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1497
        if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
	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 *) 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;

1521 1522
	if (kssl_ctx->key)  		memset(kssl_ctx->key, 0,
							      kssl_ctx->length);
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
	if (kssl_ctx->key)  		free(kssl_ctx->key);
	if (kssl_ctx->client_princ) 	free(kssl_ctx->client_princ);
	if (kssl_ctx->service_host) 	free(kssl_ctx->service_host);
	if (kssl_ctx->service_name) 	free(kssl_ctx->service_name);
	if (kssl_ctx->keytab_file) 	free(kssl_ctx->keytab_file);

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


/*	Given a (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)
        {
	char	**princ;
	int 	length;

	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)  free(*princ);

	length = entity->length + ((realm)? realm->length + 2: 1);
1556 1557
	if ((*princ = calloc(1, length)) == NULL)
		return KSSL_CTX_ERR;
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573
	else
                {
		strncpy(*princ, entity->data, entity->length);
		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:
1574 1575
**		which == KSSL_SERVICE	=>	"khost" (KRB5SVC)
**		which == KSSL_KEYTAB	=>	"/etc/krb5.keytab" (KRB5KEYTAB)
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
*/
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)  free(*string);

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

1600 1601 1602 1603
	if ((*string = calloc(1, strlen(text) + 1)) == NULL)
		return KSSL_CTX_ERR;
	else
		strcpy(*string, text);
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614

	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)
        {
1615 1616 1617 1618
	int 		length;
	krb5_enctype	enctype;
	krb5_octet FAR	*contents = NULL;

1619 1620 1621 1622 1623 1624 1625 1626 1627 1628
	if (!kssl_ctx)  return KSSL_CTX_ERR;

	if (kssl_ctx->key)
                {
		memset(kssl_ctx->key, 0, kssl_ctx->length);
		free(kssl_ctx->key);
		}

	if (session)
                {
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640

#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;
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
		}
	else
                {
		kssl_ctx->enctype = ENCTYPE_UNKNOWN;
		kssl_ctx->length  = 0;
		return KSSL_CTX_OK;
		}

	if ((kssl_ctx->key =
                (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
                {
		kssl_ctx->length  = 0;
		return KSSL_CTX_ERR;
		}
1655
	else
1656
		memcpy(kssl_ctx->key, contents, length);
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666

	return KSSL_CTX_OK;
        }


/*	Display contents of kssl_ctx struct
*/
void
kssl_ctx_show(KSSL_CTX *kssl_ctx)
        {
1667
	int 	i;
1668 1669 1670 1671 1672 1673 1674

	printf("kssl_ctx: ");
	if (kssl_ctx == NULL)
                {
		printf("NULL\n");
		return;
		}
1675 1676
	else
		printf("%p\n", kssl_ctx);
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696

	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;
        }

1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801
    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);
	}

1802
#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1803 1804 1805 1806
void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
	{
#ifdef KRB5_HEIMDAL
	data->length = 0;
1807 1808
        if (data->data)
            free(data->data);
1809 1810 1811 1812 1813
#elif defined(KRB5_MIT_OLD11)
	if (data->data)  {
		krb5_xfree(data->data);
		data->data = 0;
		}
1814 1815 1816 1817
#else
	krb5_free_data_contents(NULL, data);
#endif
	}
1818
#endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1819

1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848

/*  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 *ctime, struct tm *k_tm)
	{
	char 		c, *p;

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

	p = &ctime->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;
	}


1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928
/*  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;
	EVP_CIPHER		*enc = NULL;
	unsigned char		iv[EVP_MAX_IV_LENGTH];
1929
	unsigned char		*p, *unenc_authent;
1930
	int 			padl, outl, unencbufsize;
1931 1932
	struct tm		tm_time, *tm_l, *tm_g;
	time_t			now, tl, tg, tr, tz_offset;
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947

	*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
1948 1949
        {
        unsigned int ui;
1950 1951
	printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
	p = authentp->data; 
1952
	for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
1953
	printf("\n");
1954
        }
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
#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 = 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 */
1977 1978 1979 1980 1981 1982 1983 1984 1985
#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
1986 1987 1988
	enc = kssl_map_enc(enctype);
	memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */

1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
	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_DecryptInit(&ciph_ctx, enc, kssl_ctx->key, iv))
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"EVP_DecryptInit error decrypting authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}
	if (!EVP_DecryptUpdate(&ciph_ctx, unenc_authent, &outl,
			dec_authent->cipher->data, dec_authent->cipher->length))
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"EVP_DecryptUpdate error decrypting authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}
2012 2013 2014 2015 2016 2017 2018
	if (outl > unencbufsize)
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "Buffer overflow decrypting authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}
2019 2020 2021 2022 2023 2024 2025
	if (!EVP_DecryptFinal(&ciph_ctx, &(unenc_authent[outl]), &padl))
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
			"EVP_DecryptFinal error decrypting authenticator.\n");
		krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
		goto err;
		}
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
	outl += padl;
	if (outl > unencbufsize)
		{
		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
                        "Buffer overflow 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;
		}
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071

	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;
 		}

2072
#ifdef KSSL_DEBUG
2073 2074 2075 2076
	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");
2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
#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);
	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;
	}


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#else /* !OPENSSL_NO_KRB5 */
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#if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
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static int dummy=(int)&dummy;
#endif

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#endif	/* !OPENSSL_NO_KRB5	*/
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