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openssl/ssl/kssl.c
Dr. Stephen Henson cca1cd9a34 Submitted by: Tomas Hoger <thoger@redhat.com> 
Fix for CVE-2010-0433 where some kerberos enabled versions of OpenSSL
could be crashed if the relevant tables were not present (e.g. chrooted).
2010-03-03 15:41:18 +00:00

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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).
*
*/
/* 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);
if (krb5rc)
goto exit;
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 */
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