s3_srvr.c

	 * 0.9.7 and later allow this by default, but optionally ignore resumption requests
	 * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
	 * than a change to default behavior so that applications relying on this for security
	 * won't even compile against older library versions).
	 *
	 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
	 * renegotiation but not a new session (s->new_session remains unset): for servers,
	 * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
	 * setting will be ignored.
	 */
	if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
		{
		if (!ssl_get_new_session(s,1))
			goto err;
		}
	else
		{
		i=ssl_get_prev_session(s, p, j, d + n);
		if (i == 1)
			{ /* previous session */
			s->hit=1;
			}
		else if (i == -1)
			goto err;
		else /* i == 0 */
			{
			if (!ssl_get_new_session(s,1))
				goto err;
			}
		}

	p+=j;

	if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
		{
		/* cookie stuff */
		cookie_len = *(p++);

		/* 
		 * The ClientHello may contain a cookie even if the
		 * HelloVerify message has not been sent--make sure that it
		 * does not cause an overflow.
		 */
		if ( cookie_len > sizeof(s->d1->rcvd_cookie))
			{
			/* too much data */
			al = SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
			goto f_err;
			}

		/* verify the cookie if appropriate option is set. */
		if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
			cookie_len > 0)
			{
			memcpy(s->d1->rcvd_cookie, p, cookie_len);

			if ( s->ctx->app_verify_cookie_cb != NULL)
				{
				if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
					cookie_len) == 0)
					{
					al=SSL_AD_HANDSHAKE_FAILURE;
					SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
						SSL_R_COOKIE_MISMATCH);
					goto f_err;
					}
				/* else cookie verification succeeded */
				}
			else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
						  s->d1->cookie_len) != 0) /* default verification */
				{
					al=SSL_AD_HANDSHAKE_FAILURE;
					SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
						SSL_R_COOKIE_MISMATCH);
					goto f_err;
				}

			ret = 2;
			}

		p += cookie_len;
		}

	n2s(p,i);
	if ((i == 0) && (j != 0))
		{
		/* we need a cipher if we are not resuming a session */
		al=SSL_AD_ILLEGAL_PARAMETER;
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
		goto f_err;
		}
	if ((p+i) >= (d+n))
		{
		/* not enough data */
		al=SSL_AD_DECODE_ERROR;
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
		goto f_err;
		}
	if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
		== NULL))
		{
		goto err;
		}
	p+=i;

	/* If it is a hit, check that the cipher is in the list */
	if ((s->hit) && (i > 0))
		{
		j=0;
		id=s->session->cipher->id;

#ifdef CIPHER_DEBUG
		printf("client sent %d ciphers\n",sk_num(ciphers));
#endif
		for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
			{
			c=sk_SSL_CIPHER_value(ciphers,i);
#ifdef CIPHER_DEBUG
			printf("client [%2d of %2d]:%s\n",
				i,sk_num(ciphers),SSL_CIPHER_get_name(c));
#endif
			if (c->id == id)
				{
				j=1;
				break;
				}
			}
/* Disabled because it can be used in a ciphersuite downgrade
 * attack: CVE-2010-4180.
 */
#if 0
		if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
			{
			/* Special case as client bug workaround: the previously used cipher may
			 * not be in the current list, the client instead might be trying to
			 * continue using a cipher that before wasn't chosen due to server
			 * preferences.  We'll have to reject the connection if the cipher is not
			 * enabled, though. */
			c = sk_SSL_CIPHER_value(ciphers, 0);
			if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
				{
				s->session->cipher = c;
				j = 1;
				}
			}
#endif
		if (j == 0)
			{
			/* we need to have the cipher in the cipher
			 * list if we are asked to reuse it */
			al=SSL_AD_ILLEGAL_PARAMETER;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
			goto f_err;
			}
		}

	/* compression */
	i= *(p++);
	if ((p+i) > (d+n))
		{
		/* not enough data */
		al=SSL_AD_DECODE_ERROR;
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
		goto f_err;
		}
	q=p;
	for (j=0; j<i; j++)
		{
		if (p[j] == 0) break;
		}

	p+=i;
	if (j >= i)
		{
		/* no compress */
		al=SSL_AD_DECODE_ERROR;
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
		goto f_err;
		}

#ifndef OPENSSL_NO_TLSEXT
	/* TLS extensions*/
	if (s->version >= SSL3_VERSION)
		{
		if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
			{
			/* 'al' set by ssl_parse_clienthello_tlsext */
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
			goto f_err;
			}
		}
		if (ssl_check_clienthello_tlsext_early(s) <= 0) {
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
			goto err;
		}

	/* Check if we want to use external pre-shared secret for this
	 * handshake for not reused session only. We need to generate
	 * server_random before calling tls_session_secret_cb in order to allow
	 * SessionTicket processing to use it in key derivation. */
	{
		unsigned char *pos;
		pos=s->s3->server_random;
		if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
			{
			al=SSL_AD_INTERNAL_ERROR;
			goto f_err;
			}
	}

	if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
		{
		SSL_CIPHER *pref_cipher=NULL;

		s->session->master_key_length=sizeof(s->session->master_key);
		if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
			ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
			{
			s->hit=1;
			s->session->ciphers=ciphers;
			s->session->verify_result=X509_V_OK;

			ciphers=NULL;

			/* check if some cipher was preferred by call back */
			pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
			if (pref_cipher == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
				goto f_err;
				}

			s->session->cipher=pref_cipher;

			if (s->cipher_list)
				sk_SSL_CIPHER_free(s->cipher_list);

			if (s->cipher_list_by_id)
				sk_SSL_CIPHER_free(s->cipher_list_by_id);

			s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
			s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
			}
		}
#endif

	/* Worst case, we will use the NULL compression, but if we have other
	 * options, we will now look for them.  We have i-1 compression
	 * algorithms from the client, starting at q. */
	s->s3->tmp.new_compression=NULL;
#ifndef OPENSSL_NO_COMP
	/* This only happens if we have a cache hit */
	if (s->session->compress_meth != 0)
		{
		int m, comp_id = s->session->compress_meth;
		/* Perform sanity checks on resumed compression algorithm */
		/* Can't disable compression */
		if (s->options & SSL_OP_NO_COMPRESSION)
			{
			al=SSL_AD_INTERNAL_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
			goto f_err;
			}
		/* Look for resumed compression method */
		for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
			{
			comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
			if (comp_id == comp->id)
				{
				s->s3->tmp.new_compression=comp;
				break;
				}
			}
		if (s->s3->tmp.new_compression == NULL)
			{
			al=SSL_AD_INTERNAL_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
			goto f_err;
			}
		/* Look for resumed method in compression list */
		for (m = 0; m < i; m++)
			{
			if (q[m] == comp_id)
				break;
			}
		if (m >= i)
			{
			al=SSL_AD_ILLEGAL_PARAMETER;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
			goto f_err;
			}
		}
	else if (s->hit)
		comp = NULL;
	else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
		{ /* See if we have a match */
		int m,nn,o,v,done=0;

		nn=sk_SSL_COMP_num(s->ctx->comp_methods);
		for (m=0; m<nn; m++)
			{
			comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
			v=comp->id;
			for (o=0; o<i; o++)
				{
				if (v == q[o])
					{
					done=1;
					break;
					}
				}
			if (done) break;
			}
		if (done)
			s->s3->tmp.new_compression=comp;
		else
			comp=NULL;
		}
#else
	/* If compression is disabled we'd better not try to resume a session
	 * using compression.
	 */
	if (s->session->compress_meth != 0)
		{
		al=SSL_AD_INTERNAL_ERROR;
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
		goto f_err;
		}
#endif

	/* Given s->session->ciphers and SSL_get_ciphers, we must
	 * pick a cipher */

	if (!s->hit)
		{
#ifdef OPENSSL_NO_COMP
		s->session->compress_meth=0;
#else
		s->session->compress_meth=(comp == NULL)?0:comp->id;
#endif
		if (s->session->ciphers != NULL)
			sk_SSL_CIPHER_free(s->session->ciphers);
		s->session->ciphers=ciphers;
		if (ciphers == NULL)
			{
			al=SSL_AD_ILLEGAL_PARAMETER;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
			goto f_err;
			}
		ciphers=NULL;
		c=ssl3_choose_cipher(s,s->session->ciphers,
				     SSL_get_ciphers(s));

		if (c == NULL)
			{
			al=SSL_AD_HANDSHAKE_FAILURE;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
			goto f_err;
			}
		s->s3->tmp.new_cipher=c;
		}
	else
		{
		/* Session-id reuse */
#ifdef REUSE_CIPHER_BUG
		STACK_OF(SSL_CIPHER) *sk;
		SSL_CIPHER *nc=NULL;
		SSL_CIPHER *ec=NULL;

		if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
			{
			sk=s->session->ciphers;
			for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
				{
				c=sk_SSL_CIPHER_value(sk,i);
				if (c->algorithm_enc & SSL_eNULL)
					nc=c;
				if (SSL_C_IS_EXPORT(c))
					ec=c;
				}
			if (nc != NULL)
				s->s3->tmp.new_cipher=nc;
			else if (ec != NULL)
				s->s3->tmp.new_cipher=ec;
			else
				s->s3->tmp.new_cipher=s->session->cipher;
			}
		else
#endif
		s->s3->tmp.new_cipher=s->session->cipher;
		}

	if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
		{
		if (!ssl3_digest_cached_records(s))
			{
			al = SSL_AD_INTERNAL_ERROR;
			goto f_err;
			}
		}
	
	/* we now have the following setup. 
	 * client_random
	 * cipher_list 		- our prefered list of ciphers
	 * ciphers 		- the clients prefered list of ciphers
	 * compression		- basically ignored right now
	 * ssl version is set	- sslv3
	 * s->session		- The ssl session has been setup.
	 * s->hit		- session reuse flag
	 * s->tmp.new_cipher	- the new cipher to use.
	 */

	/* Handles TLS extensions that we couldn't check earlier */
	if (s->version >= SSL3_VERSION)
		{
		if (ssl_check_clienthello_tlsext_late(s) <= 0)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
			goto err;
			}
		}

	if (ret < 0) ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
err:
	if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
	return(ret);
	}

int ssl3_send_server_hello(SSL *s)
	{
	unsigned char *buf;
	unsigned char *p,*d;
	int i,sl;
	unsigned long l;

	if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
		{
		buf=(unsigned char *)s->init_buf->data;
#ifdef OPENSSL_NO_TLSEXT
		p=s->s3->server_random;
		if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
			return -1;
#endif
		/* Do the message type and length last */
		d=p= &(buf[4]);

		*(p++)=s->version>>8;
		*(p++)=s->version&0xff;

		/* Random stuff */
		memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
		p+=SSL3_RANDOM_SIZE;

		/* There are several cases for the session ID to send
		 * back in the server hello:
		 * - For session reuse from the session cache,
		 *   we send back the old session ID.
		 * - If stateless session reuse (using a session ticket)
		 *   is successful, we send back the client's "session ID"
		 *   (which doesn't actually identify the session).
		 * - If it is a new session, we send back the new
		 *   session ID.
		 * - However, if we want the new session to be single-use,
		 *   we send back a 0-length session ID.
		 * s->hit is non-zero in either case of session reuse,
		 * so the following won't overwrite an ID that we're supposed
		 * to send back.
		 */
		if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
			&& !s->hit)
			s->session->session_id_length=0;

		sl=s->session->session_id_length;
		if (sl > (int)sizeof(s->session->session_id))
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
			return -1;
			}
		*(p++)=sl;
		memcpy(p,s->session->session_id,sl);
		p+=sl;

		/* put the cipher */
		i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
		p+=i;

		/* put the compression method */
#ifdef OPENSSL_NO_COMP
			*(p++)=0;
#else
		if (s->s3->tmp.new_compression == NULL)
			*(p++)=0;
		else
			*(p++)=s->s3->tmp.new_compression->id;
#endif
#ifndef OPENSSL_NO_TLSEXT
		if (ssl_prepare_serverhello_tlsext(s) <= 0)
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
			return -1;
			}
		if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
			return -1;
			}
#endif
		/* do the header */
		l=(p-d);
		d=buf;
		*(d++)=SSL3_MT_SERVER_HELLO;
		l2n3(l,d);

		s->state=SSL3_ST_SW_SRVR_HELLO_B;
		/* number of bytes to write */
		s->init_num=p-buf;
		s->init_off=0;
		}

	/* SSL3_ST_SW_SRVR_HELLO_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

int ssl3_send_server_done(SSL *s)
	{
	unsigned char *p;

	if (s->state == SSL3_ST_SW_SRVR_DONE_A)
		{
		p=(unsigned char *)s->init_buf->data;

		/* do the header */
		*(p++)=SSL3_MT_SERVER_DONE;
		*(p++)=0;
		*(p++)=0;
		*(p++)=0;

		s->state=SSL3_ST_SW_SRVR_DONE_B;
		/* number of bytes to write */
		s->init_num=4;
		s->init_off=0;
		}

	/* SSL3_ST_SW_SRVR_DONE_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

int ssl3_send_server_key_exchange(SSL *s)
	{
#ifndef OPENSSL_NO_RSA
	unsigned char *q;
	int j,num;
	RSA *rsa;
	unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
	unsigned int u;
#endif
#ifndef OPENSSL_NO_DH
	DH *dh=NULL,*dhp;
#endif
#ifndef OPENSSL_NO_ECDH
	EC_KEY *ecdh=NULL, *ecdhp;
	unsigned char *encodedPoint = NULL;
	int encodedlen = 0;
	int curve_id = 0;
	BN_CTX *bn_ctx = NULL; 
#endif
	EVP_PKEY *pkey;
	const EVP_MD *md = NULL;
	unsigned char *p,*d;
	int al,i;
	unsigned long type;
	int n;
	CERT *cert;
	BIGNUM *r[4];
	int nr[4],kn;
	BUF_MEM *buf;
	EVP_MD_CTX md_ctx;

	EVP_MD_CTX_init(&md_ctx);
	if (s->state == SSL3_ST_SW_KEY_EXCH_A)
		{
		type=s->s3->tmp.new_cipher->algorithm_mkey;
		cert=s->cert;

		buf=s->init_buf;

		r[0]=r[1]=r[2]=r[3]=NULL;
		n=0;
#ifndef OPENSSL_NO_RSA
		if (type & SSL_kRSA)
			{
			rsa=cert->rsa_tmp;
			if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
				{
				rsa=s->cert->rsa_tmp_cb(s,
				      SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
				      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
				if(rsa == NULL)
				{
					al=SSL_AD_HANDSHAKE_FAILURE;
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
					goto f_err;
				}
				RSA_up_ref(rsa);
				cert->rsa_tmp=rsa;
				}
			if (rsa == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
				goto f_err;
				}
			r[0]=rsa->n;
			r[1]=rsa->e;
			s->s3->tmp.use_rsa_tmp=1;
			}
		else
#endif
#ifndef OPENSSL_NO_DH
			if (type & SSL_kEDH)
			{
			dhp=cert->dh_tmp;
			if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
				dhp=s->cert->dh_tmp_cb(s,
				      SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
				      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
			if (dhp == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
				goto f_err;
				}

			if (s->s3->tmp.dh != NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
				goto err;
				}

			if ((dh=DHparams_dup(dhp)) == NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
				goto err;
				}

			s->s3->tmp.dh=dh;
			if ((dhp->pub_key == NULL ||
			     dhp->priv_key == NULL ||
			     (s->options & SSL_OP_SINGLE_DH_USE)))
				{
				if(!DH_generate_key(dh))
				    {
				    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
					   ERR_R_DH_LIB);
				    goto err;
				    }
				}
			else
				{
				dh->pub_key=BN_dup(dhp->pub_key);
				dh->priv_key=BN_dup(dhp->priv_key);
				if ((dh->pub_key == NULL) ||
					(dh->priv_key == NULL))
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
					goto err;
					}
				}
			r[0]=dh->p;
			r[1]=dh->g;
			r[2]=dh->pub_key;
			}
		else 
#endif
#ifndef OPENSSL_NO_ECDH
			if (type & SSL_kEECDH)
			{
			const EC_GROUP *group;

			ecdhp=cert->ecdh_tmp;
			if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
				{
				ecdhp=s->cert->ecdh_tmp_cb(s,
				      SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
				      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
				}
			if (ecdhp == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
				goto f_err;
				}

			if (s->s3->tmp.ecdh != NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
				goto err;
				}

			/* Duplicate the ECDH structure. */
			if (ecdhp == NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
				goto err;
				}
			if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
				goto err;
				}

			s->s3->tmp.ecdh=ecdh;
			if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
			    (EC_KEY_get0_private_key(ecdh) == NULL) ||
			    (s->options & SSL_OP_SINGLE_ECDH_USE))
				{
				if(!EC_KEY_generate_key(ecdh))
				    {
				    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
				    goto err;
				    }
				}

			if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
			    (EC_KEY_get0_public_key(ecdh)  == NULL) ||
			    (EC_KEY_get0_private_key(ecdh) == NULL))
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
				goto err;
				}

			if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
			    (EC_GROUP_get_degree(group) > 163)) 
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
				goto err;
				}

			/* XXX: For now, we only support ephemeral ECDH
			 * keys over named (not generic) curves. For 
			 * supported named curves, curve_id is non-zero.
			 */
			if ((curve_id = 
			    tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
			    == 0)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
				goto err;
				}

			/* Encode the public key.
			 * First check the size of encoding and
			 * allocate memory accordingly.
			 */
			encodedlen = EC_POINT_point2oct(group, 
			    EC_KEY_get0_public_key(ecdh),
			    POINT_CONVERSION_UNCOMPRESSED, 
			    NULL, 0, NULL);

			encodedPoint = (unsigned char *) 
			    OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
			bn_ctx = BN_CTX_new();
			if ((encodedPoint == NULL) || (bn_ctx == NULL))
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
				goto err;
				}


			encodedlen = EC_POINT_point2oct(group, 
			    EC_KEY_get0_public_key(ecdh), 
			    POINT_CONVERSION_UNCOMPRESSED, 
			    encodedPoint, encodedlen, bn_ctx);

			if (encodedlen == 0) 
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
				goto err;
				}

			BN_CTX_free(bn_ctx);  bn_ctx=NULL;

			/* XXX: For now, we only support named (not 
			 * generic) curves in ECDH ephemeral key exchanges.
			 * In this situation, we need four additional bytes
			 * to encode the entire ServerECDHParams
			 * structure. 
			 */
			n = 4 + encodedlen;

			/* We'll generate the serverKeyExchange message
			 * explicitly so we can set these to NULLs
			 */
			r[0]=NULL;
			r[1]=NULL;
			r[2]=NULL;
			r[3]=NULL;
			}
		else 
#endif /* !OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_PSK
			if (type & SSL_kPSK)
				{
				/* reserve size for record length and PSK identity hint*/
				n+=2+strlen(s->ctx->psk_identity_hint);
				}
			else
#endif /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
		if (type & SSL_kSRP)
			{
			if ((s->srp_ctx.N == NULL) ||
				(s->srp_ctx.g == NULL) ||
				(s->srp_ctx.s == NULL) ||
				(s->srp_ctx.B == NULL))
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
				goto err;
				}
			r[0]=s->srp_ctx.N;
			r[1]=s->srp_ctx.g;
			r[2]=s->srp_ctx.s;
			r[3]=s->srp_ctx.B;
			}
		else 
#endif
			{
			al=SSL_AD_HANDSHAKE_FAILURE;
			SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
			goto f_err;
			}
		for (i=0; i < 4 && r[i] != NULL; i++)
			{
			nr[i]=BN_num_bytes(r[i]);
#ifndef OPENSSL_NO_SRP
			if ((i == 2) && (type & SSL_kSRP))
				n+=1+nr[i];
			else
#endif
			n+=2+nr[i];
			}

		if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
			&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
			{
			if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
				== NULL)
				{
				al=SSL_AD_DECODE_ERROR;
				goto f_err;
				}
			kn=EVP_PKEY_size(pkey);
			}
		else
			{
			pkey=NULL;
			kn=0;
			}

		if (!BUF_MEM_grow_clean(buf,n+4+kn))
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
			goto err;
			}
		d=(unsigned char *)s->init_buf->data;
		p= &(d[4]);

		for (i=0; i < 4 && r[i] != NULL; i++)
			{
#ifndef OPENSSL_NO_SRP
			if ((i == 2) && (type & SSL_kSRP))
				{
				*p = nr[i];
				p++;
				}
			else
#endif
			s2n(nr[i],p);
			BN_bn2bin(r[i],p);
			p+=nr[i];
			}

#ifndef OPENSSL_NO_ECDH
		if (type & SSL_kEECDH) 
			{
			/* XXX: For now, we only support named (not generic) curves.
			 * In this situation, the serverKeyExchange message has:
			 * [1 byte CurveType], [2 byte CurveName]
			 * [1 byte length of encoded point], followed by
			 * the actual encoded point itself
			 */
			*p = NAMED_CURVE_TYPE;
			p += 1;
			*p = 0;
			p += 1;
			*p = curve_id;
			p += 1;
			*p = encodedlen;
			p += 1;
			memcpy((unsigned char*)p, 
			    (unsigned char *)encodedPoint, 
			    encodedlen);
			OPENSSL_free(encodedPoint);
			encodedPoint = NULL;
			p += encodedlen;
			}
#endif

#ifndef OPENSSL_NO_PSK
		if (type & SSL_kPSK)
			{
			/* copy PSK identity hint */
			s2n(strlen(s->ctx->psk_identity_hint), p); 
			strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
			p+=strlen(s->ctx->psk_identity_hint);
			}
#endif

		/* not anonymous */
		if (pkey != NULL)
			{
			/* n is the length of the params, they start at &(d[4])
			 * and p points to the space at the end. */
#ifndef OPENSSL_NO_RSA
			if (pkey->type == EVP_PKEY_RSA
					&& TLS1_get_version(s) < TLS1_2_VERSION)
				{
				q=md_buf;
				j=0;
				for (num=2; num > 0; num--)
					{
					EVP_MD_CTX_set_flags(&md_ctx,
						EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
					EVP_DigestInit_ex(&md_ctx,(num == 2)
						?s->ctx->md5:s->ctx->sha1, NULL);
					EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
					EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
					EVP_DigestUpdate(&md_ctx,&(d[4]),n);
					EVP_DigestFinal_ex(&md_ctx,q,
						(unsigned int *)&i);
					q+=i;
					j+=i;
					}
				if (RSA_sign(NID_md5_sha1, md_buf, j,
					&(p[2]), &u, pkey->pkey.rsa) <= 0)
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
					goto err;
					}
				s2n(u,p);
				n+=u+2;
				}
			else
#endif
			if (md)
				{
				/* For TLS1.2 and later send signature
				 * algorithm */
				if (TLS1_get_version(s) >= TLS1_2_VERSION)
					{
					if (!tls12_get_sigandhash(p, pkey, md))
						{
						/* Should never happen */
						al=SSL_AD_INTERNAL_ERROR;
						SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
						goto f_err;
						}
					p+=2;
					}
#ifdef SSL_DEBUG
				fprintf(stderr, "Using hash %s\n",
							EVP_MD_name(md));
#endif
				EVP_SignInit_ex(&md_ctx, md, NULL);
				EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
				EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
				EVP_SignUpdate(&md_ctx,&(d[4]),n);
				if (!EVP_SignFinal(&md_ctx,&(p[2]),
					(unsigned int *)&i,pkey))
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
					goto err;
					}
				s2n(i,p);
				n+=i+2;
				if (TLS1_get_version(s) >= TLS1_2_VERSION)
					n+= 2;
				}
			else
				{
				/* Is this error check actually needed? */
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);