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openssl/ssl/kssl.c

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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.
*/
#ifndef NO_KRB5
#include <string.h>
#include <openssl/ssl.h>
/*
* 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(WINDOWS) || defined(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
#define krb5_auth_con_init kssl_krb5_auth_con_init
/* 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_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);
/* 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 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" );
(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" );
}
/* 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;
}
/* 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_NPROTOTYPE((krb5_context, krb5_ccache));
krb5_error_code (KRB5_CALLCONV *resolve) KRB5_NPROTOTYPE((krb5_context, krb5_ccache *,
const char *));
krb5_error_code (KRB5_CALLCONV *gen_new) KRB5_NPROTOTYPE((krb5_context, krb5_ccache *));
krb5_error_code (KRB5_CALLCONV *init) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_principal));
krb5_error_code (KRB5_CALLCONV *destroy) KRB5_NPROTOTYPE((krb5_context, krb5_ccache));
krb5_error_code (KRB5_CALLCONV *close) KRB5_NPROTOTYPE((krb5_context, krb5_ccache));
krb5_error_code (KRB5_CALLCONV *store) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_creds *));
krb5_error_code (KRB5_CALLCONV *retrieve) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_flags, krb5_creds *,
krb5_creds *));
krb5_error_code (KRB5_CALLCONV *get_princ) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_principal *));
krb5_error_code (KRB5_CALLCONV *get_first) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_cc_cursor *));
krb5_error_code (KRB5_CALLCONV *get_next) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_cc_cursor *, krb5_creds *));
krb5_error_code (KRB5_CALLCONV *end_get) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_cc_cursor *));
krb5_error_code (KRB5_CALLCONV *remove_cred) KRB5_NPROTOTYPE((krb5_context, krb5_ccache,
krb5_flags, krb5_creds *));
krb5_error_code (KRB5_CALLCONV *set_flags) KRB5_NPROTOTYPE((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)));
}
#endif /* WINDOWS || WIN32 */
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);
}
/* Set kssl_err error info when reason text is a simple string
** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
*/
void
kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
{
if (kssl_err == NULL) return;
kssl_err->reason = reason;
BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
return;
}
/* Display contents of krb5_data struct, for debugging
*/
void
print_krb5_data(char *label, krb5_data *kdata)
{
int i;
printf("%s[%d] ", label, kdata->length);
for (i=0; i < kdata->length; i++)
{
if (isprint((int) kdata->data[i]))
printf( "%c ", kdata->data[i]);
else
printf( "%02x", 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, 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 < 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 < keyblk->length; i++)
{
printf("%02x",keyblk->contents[i]);
}
printf("\n");
#endif
}
/* Given krb5 service (typically "kssl") and hostname in kssl_ctx,
** Create Kerberos AP_REQ message for SSL Client.
**
** 19990628 VRS Started.
*/
krb5_error_code
kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
/* OUT */ krb5_data *krb5_app_req, 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 krb5in_data;
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;
}
krb5in_data.data = NULL;
krb5in_data.length = 0;
krb5rc = KRB5KRB_ERR_GENERIC;
/* caller should free data of krb5_app_req */
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;
}
#ifdef KRB5_HEIMDAL
else if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
{
kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
"kssl_ctx_setkey() fails.\n");
}
#else
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 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 */ char *msg, int msglen,
/* 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_keytab krb5keytab = NULL;
krb5_principal krb5server;
krb5_data krb5in_data;
krb5_flags ap_option;
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_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;
}
/* kssl_ctx->keytab_file == NULL ==> use Kerberos default
*/
if (kssl_ctx->keytab_file)
{
krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
&krb5keytab);
if (krb5c)
{
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
*/
krb5in_data.data = msg;
krb5in_data.length = msglen;
if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, &krb5in_data,
krb5server, krb5keytab, &ap_option, &krb5ticket)) != 0)
{
BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
"krb5_rd_req() fails with %x.\n", krb5rc);
kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
goto err;
}
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");
}
else krb5rc = 0;
err:
#ifdef KSSL_DEBUG
kssl_ctx_show(kssl_ctx);
#endif /* KSSL_DEBUG */
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 *) 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) memset(kssl_ctx->key, 0, kssl_ctx->length);
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);
if ((*princ = calloc(1, length)) == NULL)
return KSSL_CTX_ERR;
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:
** 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) free(*string);
if (!text)
{
*string = '\0';
return KSSL_CTX_OK;
}
if ((*string = 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)
{
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)
{
kssl_ctx->enctype = session->enctype;
kssl_ctx->length = session->length;
}
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;
}
else
memcpy(kssl_ctx->key, session->contents, session->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", 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;
}
void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
{
#ifdef KRB5_HEIMDAL
data->length = 0;
free(data->if (data->data) data);
#else
krb5_free_data_contents(NULL, data);
#endif
}
#endif /* NO_KRB5 */
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