I've checked again and again. There really is no need to expand a to

4 times it's size when bn_sqr_recursive() won't look farther than the
original length.  Thereby, constification is no longer a problem.

crypto/bn/bn_sqr.c

@@ -69,7 +69,7 @@ int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 	BIGNUM *tmp,*rr,*free_a = NULL;
 
 #ifdef BN_COUNT
-printf("BN_sqr %d * %d\n",a->top,a->top);
+	fprintf(stderr,"BN_sqr %d * %d\n",a->top,a->top);
 #endif
 	bn_check_top(a);
 
@@ -124,10 +124,7 @@ printf("BN_sqr %d * %d\n",a->top,a->top);
 			k=j+j;
 			if (al == j)
 				{
-				BIGNUM *tmp_bn = free_a;
-				if ((a = free_a = bn_dup_expand(a,k*2)) == NULL) goto err;
 				if (bn_wexpand(tmp,k*2) == NULL) goto err;
-				if (tmp_bn) BN_free(tmp_bn);
 				bn_sqr_recursive(rr->d,a->d,al,tmp->d);
 				}
 			else
@@ -153,10 +150,11 @@ printf("BN_sqr %d * %d\n",a->top,a->top);
 	}
 
 /* tmp must have 2*n words */
-void bn_sqr_normal(BN_ULONG *r, BN_ULONG *a, int n, BN_ULONG *tmp)
+void bn_sqr_normal(BN_ULONG *r, const BN_ULONG *a, int n, BN_ULONG *tmp)
 	{
 	int i,j,max;
-	BN_ULONG *ap,*rp;
+	const BN_ULONG *ap;
+	BN_ULONG *rp;
 
 	max=n*2;
 	ap=a;
@@ -200,14 +198,14 @@ void bn_sqr_normal(BN_ULONG *r, BN_ULONG *a, int n, BN_ULONG *tmp)
  * a[0]*b[0]+a[1]*b[1]+(a[0]-a[1])*(b[1]-b[0])
  * a[1]*b[1]
  */
-void bn_sqr_recursive(BN_ULONG *r, BN_ULONG *a, int n2, BN_ULONG *t)
+void bn_sqr_recursive(BN_ULONG *r, const BN_ULONG *a, int n2, BN_ULONG *t)
 	{
 	int n=n2/2;
 	int zero,c1;
 	BN_ULONG ln,lo,*p;
 
 #ifdef BN_COUNT
-printf(" bn_sqr_recursive %d * %d\n",n2,n2);
+	fprintf(stderr," bn_sqr_recursive %d * %d\n",n2,n2);
 #endif
 	if (n2 == 4)
 		{

ssl/kssl.c

+/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */
+/* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000.
+ */
+/* ====================================================================
+ * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+
+/*	ssl/kssl.c  --  Routines to support (& debug) Kerberos5 auth for openssl
+**
+**	19990701	VRS 	Started.
+*/
+
+#ifndef NO_KRB5
+#include <string.h>
+#include <openssl/ssl.h>
+
+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;
+		}
+	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");
+        }
+
+
+/*	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;
+		}
+	else if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
+                {
+		kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
+                        "kssl_ctx_setkey() fails.\n");
+		}
+	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;
+		}
+
+	if (kssl_ctx->keytab_file  &&
+		((krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
+                        &krb5keytab))))
+                {
+		kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "krb5_kt_resolve() fails.\n");
+		goto err;
+		}
+	/*	kssl_ctx->keytab_file == NULL ==> use Kerberos default /etc/krb5.keytab
+	*/
+
+	/*	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 (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	=>	"kssl" (KRB5SVC)
+**		which == KSSL_KEYTAB	=>	"/etc/krb5.keytab.kssl" (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;
+        }
+
+#endif	/* NO_KRB5	*/
+

ssl/kssl.h

+/* ssl/kssl.h -*- mode: C; c-file-style: "eay" -*- */
+/* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000.
+ * 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).
+ *
+ */
+
+/*
+**	19990701	VRS 	Started.
+*/
+
+#ifndef	KSSL_H
+#define	KSSL_H
+
+#ifndef NO_KRB5
+
+#include <stdio.h>
+#include <ctype.h>
+#include <krb5.h>
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/*	Uncomment this to debug kssl problems or
+**	to trace usage of the Kerberos session key
+**
+**	#define		KSSL_DEBUG
+*/
+
+#ifndef	KRB5SVC
+#define KRB5SVC	"host"
+#endif
+
+#ifndef	KRB5KEYTAB
+#define KRB5KEYTAB	"/etc/krb5.keytab"
+#endif
+
+
+#define	KSSL_ERR_MAX	255
+typedef struct kssl_err_st  {
+	int  reason;
+	char text[KSSL_ERR_MAX+1];
+	} KSSL_ERR;
+
+
+/*	Context for passing
+**		(1) Kerberos session key to SSL, and
+**		(2)	Config data between application and SSL lib
+*/
+typedef struct kssl_ctx_st
+        {
+                                /*	used by:    disposition:            */
+	char *service_name;	/*	C,S	    default ok (kssl)       */
+	char *service_host;	/*	C	    input, REQUIRED         */
+	char *client_princ;	/*	S	    output from krb5 ticket */
+	char *keytab_file;	/*      S	    NULL (/etc/krb5.keytab) */
+	krb5_enctype enctype;
+	int length;
+	krb5_octet FAR *key;
+	} KSSL_CTX;
+
+#define	KSSL_CLIENT 	1
+#define KSSL_SERVER 	2
+#define	KSSL_SERVICE	3
+#define	KSSL_KEYTAB 	4
+
+#define KSSL_CTX_OK 	0
+#define KSSL_CTX_ERR	1
+#define KSSL_NOMEM	2
+
+
+void print_krb5_data(char *label, krb5_data *kdata);
+void print_krb5_authdata(char *label, krb5_authdata **adata);
+void print_krb5_keyblock(char *label, krb5_keyblock *keyblk);
+
+char *kstring(char *string);
+char *knumber(int len, krb5_octet *contents);
+
+
+void kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text);
+
+KSSL_CTX *kssl_ctx_new(void);
+KSSL_CTX *kssl_ctx_free(KSSL_CTX *kssl_ctx);
+void kssl_ctx_show(KSSL_CTX *kssl_ctx);
+krb5_error_code kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session);
+krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text);
+krb5_error_code kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
+        krb5_data *realm, krb5_data *entity);
+
+krb5_error_code	kssl_cget_tkt(KSSL_CTX *kssl_ctx,  krb5_data *ap_req,
+        KSSL_ERR *kssl_err);
+krb5_error_code	kssl_sget_tkt(KSSL_CTX *kssl_ctx,  char *msg, int msglen,
+        KSSL_ERR *kssl_err);
+
+#ifdef  __cplusplus
+}
+#endif
+#endif	/* NO_KRB5	*/
+#endif	/* KSSL_H 	*/