More size_tification.

[thirdparty/openssl.git] / ssl / ssl_asn1.c

/* ssl/ssl_asn1.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

#include <stdio.h>
#include <stdlib.h>
#include "ssl_locl.h"
#include <openssl/asn1_mac.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

typedef struct ssl_session_asn1_st
        {
        ASN1_INTEGER version;
        ASN1_INTEGER ssl_version;
        ASN1_OCTET_STRING cipher;
        ASN1_OCTET_STRING master_key;
        ASN1_OCTET_STRING session_id;
        ASN1_OCTET_STRING session_id_context;
        ASN1_OCTET_STRING key_arg;
#ifndef OPENSSL_NO_KRB5
        ASN1_OCTET_STRING krb5_princ;
#endif /* OPENSSL_NO_KRB5 */
        ASN1_INTEGER time;
        ASN1_INTEGER timeout;
        ASN1_INTEGER verify_result;
#ifndef OPENSSL_NO_TLSEXT
        ASN1_OCTET_STRING tlsext_hostname;
        ASN1_INTEGER tlsext_tick_lifetime;
        ASN1_OCTET_STRING tlsext_tick;
#endif /* OPENSSL_NO_TLSEXT */
#ifndef OPENSSL_NO_PSK
        ASN1_OCTET_STRING psk_identity_hint;
        ASN1_OCTET_STRING psk_identity;
#endif /* OPENSSL_NO_PSK */
        } SSL_SESSION_ASN1;

int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
        {
#define LSIZE2 (sizeof(long)*2)
        int v1=0,v2=0,v3=0,v4=0,v5=0,v7=0,v8=0;
        unsigned char buf[4],ibuf1[LSIZE2],ibuf2[LSIZE2];
        unsigned char ibuf3[LSIZE2],ibuf4[LSIZE2],ibuf5[LSIZE2];
#ifndef OPENSSL_NO_TLSEXT
        int v6=0,v9=0,v10=0;
        unsigned char ibuf6[LSIZE2];
#endif
        long l;
        SSL_SESSION_ASN1 a;
        M_ASN1_I2D_vars(in);

        if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
                return(0);

        /* Note that I cheat in the following 2 assignments.  I know
         * that if the ASN1_INTEGER passed to ASN1_INTEGER_set
         * is > sizeof(long)+1, the buffer will not be re-OPENSSL_malloc()ed.
         * This is a bit evil but makes things simple, no dynamic allocation
         * to clean up :-) */
        a.version.length=LSIZE2;
        a.version.type=V_ASN1_INTEGER;
        a.version.data=ibuf1;
        ASN1_INTEGER_set(&(a.version),SSL_SESSION_ASN1_VERSION);

        a.ssl_version.length=LSIZE2;
        a.ssl_version.type=V_ASN1_INTEGER;
        a.ssl_version.data=ibuf2;
        ASN1_INTEGER_set(&(a.ssl_version),in->ssl_version);

        a.cipher.type=V_ASN1_OCTET_STRING;
        a.cipher.data=buf;

        if (in->cipher == NULL)
                l=in->cipher_id;
        else
                l=in->cipher->id;
        if (in->ssl_version == SSL2_VERSION)
                {
                a.cipher.length=3;
                buf[0]=((unsigned char)(l>>16L))&0xff;
                buf[1]=((unsigned char)(l>> 8L))&0xff;
                buf[2]=((unsigned char)(l     ))&0xff;
                }
        else
                {
                a.cipher.length=2;
                buf[0]=((unsigned char)(l>>8L))&0xff;
                buf[1]=((unsigned char)(l    ))&0xff;
                }

        a.master_key.length=in->master_key_length;
        a.master_key.type=V_ASN1_OCTET_STRING;
        a.master_key.data=in->master_key;

        a.session_id.length=in->session_id_length;
        a.session_id.type=V_ASN1_OCTET_STRING;
        a.session_id.data=in->session_id;

        a.session_id_context.length=in->sid_ctx_length;
        a.session_id_context.type=V_ASN1_OCTET_STRING;
        a.session_id_context.data=in->sid_ctx;

        a.key_arg.length=in->key_arg_length;
        a.key_arg.type=V_ASN1_OCTET_STRING;
        a.key_arg.data=in->key_arg;

#ifndef OPENSSL_NO_KRB5
        if (in->krb5_client_princ_len)
                {
                a.krb5_princ.length=in->krb5_client_princ_len;
                a.krb5_princ.type=V_ASN1_OCTET_STRING;
                a.krb5_princ.data=in->krb5_client_princ;
                }
#endif /* OPENSSL_NO_KRB5 */

        if (in->time != 0L)
                {
                a.time.length=LSIZE2;
                a.time.type=V_ASN1_INTEGER;
                a.time.data=ibuf3;
                ASN1_INTEGER_set(&(a.time),in->time);
                }

        if (in->timeout != 0L)
                {
                a.timeout.length=LSIZE2;
                a.timeout.type=V_ASN1_INTEGER;
                a.timeout.data=ibuf4;
                ASN1_INTEGER_set(&(a.timeout),in->timeout);
                }

        if (in->verify_result != X509_V_OK)
                {
                a.verify_result.length=LSIZE2;
                a.verify_result.type=V_ASN1_INTEGER;
                a.verify_result.data=ibuf5;
                ASN1_INTEGER_set(&a.verify_result,in->verify_result);
                }

#ifndef OPENSSL_NO_TLSEXT
        if (in->tlsext_hostname)
                {
                a.tlsext_hostname.length=strlen(in->tlsext_hostname);
                a.tlsext_hostname.type=V_ASN1_OCTET_STRING;
                a.tlsext_hostname.data=(unsigned char *)in->tlsext_hostname;
                }
        if (in->tlsext_tick)
                {
                a.tlsext_tick.length= in->tlsext_ticklen;
                a.tlsext_tick.type=V_ASN1_OCTET_STRING;
                a.tlsext_tick.data=(unsigned char *)in->tlsext_tick;
                /* If we have a ticket set session ID to empty because
                 * it will be bogus. If liftime hint is -1 treat as a special
                 * case because the session is being used as a container
                 */
                if (in->tlsext_ticklen && (in->tlsext_tick_lifetime_hint != -1))
                        a.session_id.length=0;
                }
        if (in->tlsext_tick_lifetime_hint > 0)
                {
                a.tlsext_tick_lifetime.length=LSIZE2;
                a.tlsext_tick_lifetime.type=V_ASN1_INTEGER;
                a.tlsext_tick_lifetime.data=ibuf6;
                ASN1_INTEGER_set(&a.tlsext_tick_lifetime,in->tlsext_tick_lifetime_hint);
                }
#endif /* OPENSSL_NO_TLSEXT */
#ifndef OPENSSL_NO_PSK
        if (in->psk_identity_hint)
                {
                a.psk_identity_hint.length=strlen(in->psk_identity_hint);
                a.psk_identity_hint.type=V_ASN1_OCTET_STRING;
                a.psk_identity_hint.data=(unsigned char *)(in->psk_identity_hint);
                }
        if (in->psk_identity)
                {
                a.psk_identity.length=strlen(in->psk_identity);
                a.psk_identity.type=V_ASN1_OCTET_STRING;
                a.psk_identity.data=(unsigned char *)(in->psk_identity);
                }
#endif /* OPENSSL_NO_PSK */

        M_ASN1_I2D_len(&(a.version),            i2d_ASN1_INTEGER);
        M_ASN1_I2D_len(&(a.ssl_version),        i2d_ASN1_INTEGER);
        M_ASN1_I2D_len(&(a.cipher),             i2d_ASN1_OCTET_STRING);
        M_ASN1_I2D_len(&(a.session_id),         i2d_ASN1_OCTET_STRING);
        M_ASN1_I2D_len(&(a.master_key),         i2d_ASN1_OCTET_STRING);
#ifndef OPENSSL_NO_KRB5
        if (in->krb5_client_princ_len)
                M_ASN1_I2D_len(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
#endif /* OPENSSL_NO_KRB5 */
        if (in->key_arg_length > 0)
                M_ASN1_I2D_len_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING);
        if (in->time != 0L)
                M_ASN1_I2D_len_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
        if (in->timeout != 0L)
                M_ASN1_I2D_len_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
        if (in->peer != NULL)
                M_ASN1_I2D_len_EXP_opt(in->peer,i2d_X509,3,v3);
        M_ASN1_I2D_len_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,v4);
        if (in->verify_result != X509_V_OK)
                M_ASN1_I2D_len_EXP_opt(&(a.verify_result),i2d_ASN1_INTEGER,5,v5);

#ifndef OPENSSL_NO_TLSEXT
        if (in->tlsext_tick_lifetime_hint > 0)
                M_ASN1_I2D_len_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER,9,v9);
        if (in->tlsext_tick)
                M_ASN1_I2D_len_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING,10,v10);
        if (in->tlsext_hostname)
                M_ASN1_I2D_len_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING,6,v6);
#endif /* OPENSSL_NO_TLSEXT */
#ifndef OPENSSL_NO_PSK
        if (in->psk_identity_hint)
                M_ASN1_I2D_len_EXP_opt(&(a.psk_identity_hint), i2d_ASN1_OCTET_STRING,7,v7);
        if (in->psk_identity)
                M_ASN1_I2D_len_EXP_opt(&(a.psk_identity), i2d_ASN1_OCTET_STRING,8,v8);
#endif /* OPENSSL_NO_PSK */

        M_ASN1_I2D_seq_total();

        M_ASN1_I2D_put(&(a.version),            i2d_ASN1_INTEGER);
        M_ASN1_I2D_put(&(a.ssl_version),        i2d_ASN1_INTEGER);
        M_ASN1_I2D_put(&(a.cipher),             i2d_ASN1_OCTET_STRING);
        M_ASN1_I2D_put(&(a.session_id),         i2d_ASN1_OCTET_STRING);
        M_ASN1_I2D_put(&(a.master_key),         i2d_ASN1_OCTET_STRING);
#ifndef OPENSSL_NO_KRB5
        if (in->krb5_client_princ_len)
                M_ASN1_I2D_put(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
#endif /* OPENSSL_NO_KRB5 */
        if (in->key_arg_length > 0)
                M_ASN1_I2D_put_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING,0);
        if (in->time != 0L)
                M_ASN1_I2D_put_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
        if (in->timeout != 0L)
                M_ASN1_I2D_put_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
        if (in->peer != NULL)
                M_ASN1_I2D_put_EXP_opt(in->peer,i2d_X509,3,v3);
        M_ASN1_I2D_put_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,
                               v4);
        if (in->verify_result != X509_V_OK)
                M_ASN1_I2D_put_EXP_opt(&a.verify_result,i2d_ASN1_INTEGER,5,v5);
#ifndef OPENSSL_NO_TLSEXT
        if (in->tlsext_hostname)
                M_ASN1_I2D_put_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING,6,v6);
#endif /* OPENSSL_NO_TLSEXT */
#ifndef OPENSSL_NO_PSK
        if (in->psk_identity_hint)
                M_ASN1_I2D_put_EXP_opt(&(a.psk_identity_hint), i2d_ASN1_OCTET_STRING,7,v7);
        if (in->psk_identity)
                M_ASN1_I2D_put_EXP_opt(&(a.psk_identity), i2d_ASN1_OCTET_STRING,8,v8);
#endif /* OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_TLSEXT
        if (in->tlsext_tick_lifetime_hint > 0)
                M_ASN1_I2D_put_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER,9,v9);
        if (in->tlsext_tick)
                M_ASN1_I2D_put_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING,10,v10);
#endif /* OPENSSL_NO_TLSEXT */
        M_ASN1_I2D_finish();
        }

SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
                             size_t length)
        {
        int version,ssl_version=0,i;
        long id;
        ASN1_INTEGER ai,*aip;
        ASN1_OCTET_STRING os,*osp;
        M_ASN1_D2I_vars(a,SSL_SESSION *,SSL_SESSION_new);

        aip= &ai;
        osp= &os;

        M_ASN1_D2I_Init();
        M_ASN1_D2I_start_sequence();

        ai.data=NULL; ai.length=0;
        M_ASN1_D2I_get_x(ASN1_INTEGER,aip,d2i_ASN1_INTEGER);
        version=(int)ASN1_INTEGER_get(aip);
        if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }

        /* we don't care about the version right now :-) */
        M_ASN1_D2I_get_x(ASN1_INTEGER,aip,d2i_ASN1_INTEGER);
        ssl_version=(int)ASN1_INTEGER_get(aip);
        ret->ssl_version=ssl_version;
        if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }

        os.data=NULL; os.length=0;
        M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
        if (ssl_version == SSL2_VERSION)
                {
                if (os.length != 3)
                        {
                        c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
                        goto err;
                        }
                id=0x02000000L|
                        ((unsigned long)os.data[0]<<16L)|
                        ((unsigned long)os.data[1]<< 8L)|
                         (unsigned long)os.data[2];
                }
        else if ((ssl_version>>8) == SSL3_VERSION_MAJOR)
                {
                if (os.length != 2)
                        {
                        c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
                        goto err;
                        }
                id=0x03000000L|
                        ((unsigned long)os.data[0]<<8L)|
                         (unsigned long)os.data[1];
                }
        else
                {
                SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_UNKNOWN_SSL_VERSION);
                return(NULL);
                }
        
        ret->cipher=NULL;
        ret->cipher_id=id;

        M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
        if ((ssl_version>>8) == SSL3_VERSION_MAJOR)
                i=SSL3_MAX_SSL_SESSION_ID_LENGTH;
        else /* if (ssl_version>>8 == SSL2_VERSION_MAJOR) */
                i=SSL2_MAX_SSL_SESSION_ID_LENGTH;

        if (os.length > i)
                os.length = i;
        if (os.length > (int)sizeof(ret->session_id)) /* can't happen */
                os.length = sizeof(ret->session_id);

        ret->session_id_length=os.length;
        OPENSSL_assert(os.length <= (int)sizeof(ret->session_id));
        memcpy(ret->session_id,os.data,os.length);

        M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
        if (os.length > SSL_MAX_MASTER_KEY_LENGTH)
                ret->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
        else
                ret->master_key_length=os.length;
        memcpy(ret->master_key,os.data,ret->master_key_length);

        os.length=0;

#ifndef OPENSSL_NO_KRB5
        os.length=0;
        M_ASN1_D2I_get_opt(osp,d2i_ASN1_OCTET_STRING,V_ASN1_OCTET_STRING);
        if (os.data)
                {
                if (os.length > SSL_MAX_KRB5_PRINCIPAL_LENGTH)
                        ret->krb5_client_princ_len=0;
                else
                        ret->krb5_client_princ_len=os.length;
                memcpy(ret->krb5_client_princ,os.data,ret->krb5_client_princ_len);
                OPENSSL_free(os.data);
                os.data = NULL;
                os.length = 0;
                }
        else
                ret->krb5_client_princ_len=0;
#endif /* OPENSSL_NO_KRB5 */

        M_ASN1_D2I_get_IMP_opt(osp,d2i_ASN1_OCTET_STRING,0,V_ASN1_OCTET_STRING);
        if (os.length > SSL_MAX_KEY_ARG_LENGTH)
                ret->key_arg_length=SSL_MAX_KEY_ARG_LENGTH;
        else
                ret->key_arg_length=os.length;
        memcpy(ret->key_arg,os.data,ret->key_arg_length);
        if (os.data != NULL) OPENSSL_free(os.data);

        ai.length=0;
        M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,1);
        if (ai.data != NULL)
                {
                ret->time=ASN1_INTEGER_get(aip);
                OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
                }
        else
                ret->time=(unsigned long)time(NULL);

        ai.length=0;
        M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,2);
        if (ai.data != NULL)
                {
                ret->timeout=ASN1_INTEGER_get(aip);
                OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
                }
        else
                ret->timeout=3;

        if (ret->peer != NULL)
                {
                X509_free(ret->peer);
                ret->peer=NULL;
                }
        M_ASN1_D2I_get_EXP_opt(ret->peer,d2i_X509,3);

        os.length=0;
        os.data=NULL;
        M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,4);

        if(os.data != NULL)
            {
            if (os.length > SSL_MAX_SID_CTX_LENGTH)
                {
                ret->sid_ctx_length=os.length;
                SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_BAD_LENGTH);
                }
            else
                {
                ret->sid_ctx_length=os.length;
                memcpy(ret->sid_ctx,os.data,os.length);
                }
            OPENSSL_free(os.data); os.data=NULL; os.length=0;
            }
        else
            ret->sid_ctx_length=0;

        ai.length=0;
        M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,5);
        if (ai.data != NULL)
                {
                ret->verify_result=ASN1_INTEGER_get(aip);
                OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
                }
        else
                ret->verify_result=X509_V_OK;

#ifndef OPENSSL_NO_TLSEXT
        os.length=0;
        os.data=NULL;
        M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,6);
        if (os.data)
                {
                ret->tlsext_hostname = BUF_strndup((char *)os.data, os.length);
                OPENSSL_free(os.data);
                os.data = NULL;
                os.length = 0;
                }
        else
                ret->tlsext_hostname=NULL;
#endif /* OPENSSL_NO_TLSEXT */

#ifndef OPENSSL_NO_PSK
        os.length=0;
        os.data=NULL;
        M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,7);
        if (os.data)
                {
                ret->psk_identity_hint = BUF_strndup((char *)os.data, os.length);
                OPENSSL_free(os.data);
                os.data = NULL;
                os.length = 0;
                }
        else
                ret->psk_identity_hint=NULL;
#endif /* OPENSSL_NO_PSK */

#ifndef OPENSSL_NO_TLSEXT
        ai.length=0;
        M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,9);
        if (ai.data != NULL)
                {
                ret->tlsext_tick_lifetime_hint=ASN1_INTEGER_get(aip);
                OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
                }
        else if (ret->tlsext_ticklen && ret->session_id_length)
                ret->tlsext_tick_lifetime_hint = -1;
        else
                ret->tlsext_tick_lifetime_hint=0;
        os.length=0;
        os.data=NULL;
        M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,10);
        if (os.data)
                {
                ret->tlsext_tick = os.data;
                ret->tlsext_ticklen = os.length;
                os.data = NULL;
                os.length = 0;
#if 0
                /* There are two ways to detect a resumed ticket sesion.
                 * One is to set a random session ID and then the server
                 * must return a match in ServerHello. This allows the normal
                 * client session ID matching to work.
                 */ 
                if (ret->session_id_length == 0)
                        {
                        ret->session_id_length=SSL3_MAX_SSL_SESSION_ID_LENGTH;
                        RAND_pseudo_bytes(ret->session_id,
                                                ret->session_id_length);
                        }
#endif
                }
        else
                ret->tlsext_tick=NULL;
#endif /* OPENSSL_NO_TLSEXT */

        M_ASN1_D2I_Finish(a,SSL_SESSION_free,SSL_F_D2I_SSL_SESSION);
        }