s3_srvr.c

		**  but will return authtime == 0.
		*/
		if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
					&authtime, &kssl_err)) != 0)
			{
#ifdef KSSL_DEBUG
                        printf("kssl_check_authent rtn %d [%d]\n",
                                krb5rc, kssl_err.reason);
                        if (kssl_err.text)
                                printf("kssl_err text= %s\n", kssl_err.text);
#endif	/* KSSL_DEBUG */
                        SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
                                kssl_err.reason);
                        goto err;
			}

		if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
                        goto err;
			}

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

		enc = kssl_map_enc(kssl_ctx->enctype);
                if (enc == NULL)
                    goto err;

		memset(iv, 0, sizeof iv);	/* per RFC 1510 */

		if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_DECRYPTION_FAILED);
			goto err;
			}
		if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
					(unsigned char *)enc_pms.data, enc_pms.length))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_DECRYPTION_FAILED);
			goto err;
			}
		if (outl > SSL_MAX_MASTER_KEY_LENGTH)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_DATA_LENGTH_TOO_LONG);
			goto err;
			}
		if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_DECRYPTION_FAILED);
			goto err;
			}
		outl += padl;
		if (outl > SSL_MAX_MASTER_KEY_LENGTH)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_DATA_LENGTH_TOO_LONG);
			goto err;
			}
		if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
		    {
		    /* The premaster secret must contain the same version number as the
		     * ClientHello to detect version rollback attacks (strangely, the
		     * protocol does not offer such protection for DH ciphersuites).
		     * However, buggy clients exist that send random bytes instead of
		     * the protocol version.
		     * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
		     * (Perhaps we should have a separate BUG value for the Kerberos cipher)
		     */
		    if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
			   (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
		        {
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
			       SSL_AD_DECODE_ERROR);
			goto err;
			}
		    }

		EVP_CIPHER_CTX_cleanup(&ciph_ctx);

                s->session->master_key_length=
                        s->method->ssl3_enc->generate_master_secret(s,
                                s->session->master_key, pms, outl);

                if (kssl_ctx->client_princ)
                        {
                        size_t len = strlen(kssl_ctx->client_princ);
                        if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
                                {
                                s->session->krb5_client_princ_len = len;
                                memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
                                }
                        }


                /*  Was doing kssl_ctx_free() here,
		**  but it caused problems for apache.
                **  kssl_ctx = kssl_ctx_free(kssl_ctx);
                **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
                */
                }
	else
#endif	/* OPENSSL_NO_KRB5 */

#ifndef OPENSSL_NO_ECDH
		if ((l & SSL_kECDH) || (l & SSL_kEECDH))
		{
		int ret = 1;
		int field_size = 0;
		const EC_KEY   *tkey;
		const EC_GROUP *group;
		const BIGNUM *priv_key;

                /* initialize structures for server's ECDH key pair */
		if ((srvr_ecdh = EC_KEY_new()) == NULL) 
			{
                	SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
			    ERR_R_MALLOC_FAILURE);
                	goto err;
			}

		/* Let's get server private key and group information */
		if (l & SSL_kECDH) 
			{ 
                        /* use the certificate */
			tkey = s->cert->key->privatekey->pkey.ec;
			}
		else
			{
			/* use the ephermeral values we saved when
			 * generating the ServerKeyExchange msg.
			 */
			tkey = s->s3->tmp.ecdh;
			}

		group    = EC_KEY_get0_group(tkey);
		priv_key = EC_KEY_get0_private_key(tkey);

		if (!EC_KEY_set_group(srvr_ecdh, group) ||
		    !EC_KEY_set_private_key(srvr_ecdh, priv_key))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
			       ERR_R_EC_LIB);
			goto err;
			}

		/* Let's get client's public key */
		if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
			    ERR_R_MALLOC_FAILURE);
			goto err;
			}

                if (n == 0L) 
                        {
			/* Client Publickey was in Client Certificate */

			 if (l & SSL_kEECDH)
				 {
				 al=SSL_AD_HANDSHAKE_FAILURE;
				 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
				 goto f_err;
				 }
                        if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
			    == NULL) || 
			    (clnt_pub_pkey->type != EVP_PKEY_EC))
                        	{
				/* XXX: For now, we do not support client
				 * authentication using ECDH certificates
				 * so this branch (n == 0L) of the code is
				 * never executed. When that support is
				 * added, we ought to ensure the key 
				 * received in the certificate is 
				 * authorized for key agreement.
				 * ECDH_compute_key implicitly checks that
				 * the two ECDH shares are for the same
				 * group.
				 */
                           	al=SSL_AD_HANDSHAKE_FAILURE;
                           	SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				    SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
                           	goto f_err;
                           	}

			if (EC_POINT_copy(clnt_ecpoint,
			    EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					ERR_R_EC_LIB);
				goto err;
				}
                        ret = 2; /* Skip certificate verify processing */
                        }
                else
                        {
			/* Get client's public key from encoded point
			 * in the ClientKeyExchange message.
			 */
			if ((bn_ctx = BN_CTX_new()) == NULL)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				    ERR_R_MALLOC_FAILURE);
				goto err;
				}

                        /* Get encoded point length */
                        i = *p; 
			p += 1;
                        if (EC_POINT_oct2point(group, 
			    clnt_ecpoint, p, i, bn_ctx) == 0)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				    ERR_R_EC_LIB);
				goto err;
				}
                        /* p is pointing to somewhere in the buffer
                         * currently, so set it to the start 
                         */ 
                        p=(unsigned char *)s->init_buf->data;
                        }

		/* Compute the shared pre-master secret */
		field_size = EC_GROUP_get_degree(group);
		if (field_size <= 0)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
			       ERR_R_ECDH_LIB);
			goto err;
			}
		i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
                if (i <= 0)
                        {
                        SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
			    ERR_R_ECDH_LIB);
                        goto err;
                        }

		EVP_PKEY_free(clnt_pub_pkey);
		EC_POINT_free(clnt_ecpoint);
		if (srvr_ecdh != NULL) 
			EC_KEY_free(srvr_ecdh);
		BN_CTX_free(bn_ctx);

		/* Compute the master secret */
                s->session->master_key_length = s->method->ssl3_enc-> \
		    generate_master_secret(s, s->session->master_key, p, i);
		
                OPENSSL_cleanse(p, i);
                return (ret);
		}
	else
#endif
#ifndef OPENSSL_NO_PSK
		if (l & SSL_kPSK)
			{
			unsigned char *t = NULL;
			unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
			unsigned int pre_ms_len = 0, psk_len = 0;
			int psk_err = 1;
			char tmp_id[PSK_MAX_IDENTITY_LEN+1];

			al=SSL_AD_HANDSHAKE_FAILURE;

			n2s(p,i);
			if (n != i+2)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					SSL_R_LENGTH_MISMATCH);
				goto psk_err;
				}
			if (i > PSK_MAX_IDENTITY_LEN)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					SSL_R_DATA_LENGTH_TOO_LONG);
				goto psk_err;
				}
			if (s->psk_server_callback == NULL)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				       SSL_R_PSK_NO_SERVER_CB);
				goto psk_err;
				}

			/* Create guaranteed NULL-terminated identity
			 * string for the callback */
			memcpy(tmp_id, p, i);
			memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
			psk_len = s->psk_server_callback(s, tmp_id,
				psk_or_pre_ms, sizeof(psk_or_pre_ms));
			OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);

			if (psk_len > PSK_MAX_PSK_LEN)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					ERR_R_INTERNAL_ERROR);
				goto psk_err;
				}
			else if (psk_len == 0)
				{
				/* PSK related to the given identity not found */
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				       SSL_R_PSK_IDENTITY_NOT_FOUND);
				al=SSL_AD_UNKNOWN_PSK_IDENTITY;
				goto psk_err;
				}

			/* create PSK pre_master_secret */
			pre_ms_len=2+psk_len+2+psk_len;
			t = psk_or_pre_ms;
			memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
			s2n(psk_len, t);
			memset(t, 0, psk_len);
			t+=psk_len;
			s2n(psk_len, t);

			if (s->session->psk_identity != NULL)
				OPENSSL_free(s->session->psk_identity);
			s->session->psk_identity = BUF_strdup((char *)p);
			if (s->session->psk_identity == NULL)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					ERR_R_MALLOC_FAILURE);
				goto psk_err;
				}

			if (s->session->psk_identity_hint != NULL)
				OPENSSL_free(s->session->psk_identity_hint);
			s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
			if (s->ctx->psk_identity_hint != NULL &&
				s->session->psk_identity_hint == NULL)
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
					ERR_R_MALLOC_FAILURE);
				goto psk_err;
				}

			s->session->master_key_length=
				s->method->ssl3_enc->generate_master_secret(s,
					s->session->master_key, psk_or_pre_ms, pre_ms_len);
			psk_err = 0;
		psk_err:
			OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
                        if (psk_err != 0)
                                goto f_err;
			}
		else
#endif
		{
		al=SSL_AD_HANDSHAKE_FAILURE;
		SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
				SSL_R_UNKNOWN_CIPHER_TYPE);
		goto f_err;
		}

	return(1);
f_err:
	ssl3_send_alert(s,SSL3_AL_FATAL,al);
#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
err:
#endif
#ifndef OPENSSL_NO_ECDH
	EVP_PKEY_free(clnt_pub_pkey);
	EC_POINT_free(clnt_ecpoint);
	if (srvr_ecdh != NULL) 
		EC_KEY_free(srvr_ecdh);
	BN_CTX_free(bn_ctx);
#endif
	return(-1);
	}

int ssl3_get_cert_verify(SSL *s)
	{
	EVP_PKEY *pkey=NULL;
	unsigned char *p;
	int al,ok,ret=0;
	long n;
	int type=0,i,j;
	X509 *peer;

	n=s->method->ssl_get_message(s,
		SSL3_ST_SR_CERT_VRFY_A,
		SSL3_ST_SR_CERT_VRFY_B,
		-1,
		514, /* 514? */
		&ok);

	if (!ok) return((int)n);

	if (s->session->peer != NULL)
		{
		peer=s->session->peer;
		pkey=X509_get_pubkey(peer);
		type=X509_certificate_type(peer,pkey);
		}
	else
		{
		peer=NULL;
		pkey=NULL;
		}

	if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
		{
		s->s3->tmp.reuse_message=1;
		if ((peer != NULL) && (type | EVP_PKT_SIGN))
			{
			al=SSL_AD_UNEXPECTED_MESSAGE;
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
			goto f_err;
			}
		ret=1;
		goto end;
		}

	if (peer == NULL)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
		al=SSL_AD_UNEXPECTED_MESSAGE;
		goto f_err;
		}

	if (!(type & EVP_PKT_SIGN))
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
		al=SSL_AD_ILLEGAL_PARAMETER;
		goto f_err;
		}

	if (s->s3->change_cipher_spec)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
		al=SSL_AD_UNEXPECTED_MESSAGE;
		goto f_err;
		}

	/* we now have a signature that we need to verify */
	p=(unsigned char *)s->init_msg;
	n2s(p,i);
	n-=2;
	if (i > n)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
		al=SSL_AD_DECODE_ERROR;
		goto f_err;
		}

	j=EVP_PKEY_size(pkey);
	if ((i > j) || (n > j) || (n <= 0))
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
		al=SSL_AD_DECODE_ERROR;
		goto f_err;
		}

#ifndef OPENSSL_NO_RSA 
	if (pkey->type == EVP_PKEY_RSA)
		{
		i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
			MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
							pkey->pkey.rsa);
		if (i < 0)
			{
			al=SSL_AD_DECRYPT_ERROR;
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
			goto f_err;
			}
		if (i == 0)
			{
			al=SSL_AD_DECRYPT_ERROR;
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
			goto f_err;
			}
		}
	else
#endif
#ifndef OPENSSL_NO_DSA
		if (pkey->type == EVP_PKEY_DSA)
		{
		j=DSA_verify(pkey->save_type,
			&(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
			SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
		if (j <= 0)
			{
			/* bad signature */
			al=SSL_AD_DECRYPT_ERROR;
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
			goto f_err;
			}
		}
	else
#endif
#ifndef OPENSSL_NO_ECDSA
		if (pkey->type == EVP_PKEY_EC)
		{
		j=ECDSA_verify(pkey->save_type,
			&(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
			SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
		if (j <= 0)
			{
			/* bad signature */
			al=SSL_AD_DECRYPT_ERROR;
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
			    SSL_R_BAD_ECDSA_SIGNATURE);
			goto f_err;
			}
		}
	else
#endif
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
		al=SSL_AD_UNSUPPORTED_CERTIFICATE;
		goto f_err;
		}


	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
end:
	EVP_PKEY_free(pkey);
	return(ret);
	}

int ssl3_get_client_certificate(SSL *s)
	{
	int i,ok,al,ret= -1;
	X509 *x=NULL;
	unsigned long l,nc,llen,n;
	const unsigned char *p,*q;
	unsigned char *d;
	STACK_OF(X509) *sk=NULL;

	n=s->method->ssl_get_message(s,
		SSL3_ST_SR_CERT_A,
		SSL3_ST_SR_CERT_B,
		-1,
		s->max_cert_list,
		&ok);

	if (!ok) return((int)n);

	if	(s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
		{
		if (	(s->verify_mode & SSL_VERIFY_PEER) &&
			(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
			al=SSL_AD_HANDSHAKE_FAILURE;
			goto f_err;
			}
		/* If tls asked for a client cert, the client must return a 0 list */
		if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
			al=SSL_AD_UNEXPECTED_MESSAGE;
			goto f_err;
			}
		s->s3->tmp.reuse_message=1;
		return(1);
		}

	if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
		{
		al=SSL_AD_UNEXPECTED_MESSAGE;
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
		goto f_err;
		}
	p=d=(unsigned char *)s->init_msg;

	if ((sk=sk_X509_new_null()) == NULL)
		{
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	n2l3(p,llen);
	if (llen+3 != n)
		{
		al=SSL_AD_DECODE_ERROR;
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
		goto f_err;
		}
	for (nc=0; nc<llen; )
		{
		n2l3(p,l);
		if ((l+nc+3) > llen)
			{
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
			goto f_err;
			}

		q=p;
		x=d2i_X509(NULL,&p,l);
		if (x == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
			goto err;
			}
		if (p != (q+l))
			{
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
			goto f_err;
			}
		if (!sk_X509_push(sk,x))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		x=NULL;
		nc+=l+3;
		}

	if (sk_X509_num(sk) <= 0)
		{
		/* TLS does not mind 0 certs returned */
		if (s->version == SSL3_VERSION)
			{
			al=SSL_AD_HANDSHAKE_FAILURE;
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
			goto f_err;
			}
		/* Fail for TLS only if we required a certificate */
		else if ((s->verify_mode & SSL_VERIFY_PEER) &&
			 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
			al=SSL_AD_HANDSHAKE_FAILURE;
			goto f_err;
			}
		}
	else
		{
		i=ssl_verify_cert_chain(s,sk);
		if (!i)
			{
			al=ssl_verify_alarm_type(s->verify_result);
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
			goto f_err;
			}
		}

	if (s->session->peer != NULL) /* This should not be needed */
		X509_free(s->session->peer);
	s->session->peer=sk_X509_shift(sk);
	s->session->verify_result = s->verify_result;

	/* With the current implementation, sess_cert will always be NULL
	 * when we arrive here. */
	if (s->session->sess_cert == NULL)
		{
		s->session->sess_cert = ssl_sess_cert_new();
		if (s->session->sess_cert == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}
	if (s->session->sess_cert->cert_chain != NULL)
		sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
	s->session->sess_cert->cert_chain=sk;
	/* Inconsistency alert: cert_chain does *not* include the
	 * peer's own certificate, while we do include it in s3_clnt.c */

	sk=NULL;

	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
err:
	if (x != NULL) X509_free(x);
	if (sk != NULL) sk_X509_pop_free(sk,X509_free);
	return(ret);
	}

int ssl3_send_server_certificate(SSL *s)
	{
	unsigned long l;
	X509 *x;

	if (s->state == SSL3_ST_SW_CERT_A)
		{
		x=ssl_get_server_send_cert(s);
		if (x == NULL &&
                        /* VRS: allow null cert if auth == KRB5 */
                        (s->s3->tmp.new_cipher->algorithms
                                & (SSL_MKEY_MASK|SSL_AUTH_MASK))
                        != (SSL_aKRB5|SSL_kKRB5))
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
			return(0);
			}

		l=ssl3_output_cert_chain(s,x);
		s->state=SSL3_ST_SW_CERT_B;
		s->init_num=(int)l;
		s->init_off=0;
		}

	/* SSL3_ST_SW_CERT_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}