d1_clnt.c

mediastreamer2是开源的网络传输媒体流的库

				goto err;
				}
			memcpy(p,s->session->session_id,i);
			p+=i;
			}
		
		/* cookie stuff */
		if ( s->d1->cookie_len > sizeof(s->d1->cookie))
			{
			SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
			goto err;
			}
		*(p++) = s->d1->cookie_len;
		memcpy(p, s->d1->cookie, s->d1->cookie_len);
		p += s->d1->cookie_len;

		/* Ciphers supported */
		i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
		if (i == 0)
			{
			SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
			goto err;
			}
		s2n(i,p);
		p+=i;

		/* COMPRESSION */
		if (s->ctx->comp_methods == NULL)
			j=0;
		else
			j=sk_SSL_COMP_num(s->ctx->comp_methods);
		*(p++)=1+j;
		for (i=0; i<j; i++)
			{
			comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
			*(p++)=comp->id;
			}
		*(p++)=0; /* Add the NULL method */
		
		l=(p-d);
		d=buf;

		d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);

		s->state=SSL3_ST_CW_CLNT_HELLO_B;
		/* number of bytes to write */
		s->init_num=p-buf;
		s->init_off=0;

		/* buffer the message to handle re-xmits */
		dtls1_buffer_message(s, 0);
		}

	/* SSL3_ST_CW_CLNT_HELLO_B */
	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}

static int dtls1_get_hello_verify(SSL *s)
	{
	int n, al, ok = 0;
	unsigned char *data;
	unsigned int cookie_len;

	n=s->method->ssl_get_message(s,
		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
		DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
		-1,
		s->max_cert_list,
		&ok);

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

	if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
		{
		s->d1->send_cookie = 0;
		s->s3->tmp.reuse_message=1;
		return(1);
		}

	data = (unsigned char *)s->init_msg;

	if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
		{
		SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
		s->version=(s->version&0xff00)|data[1];
		al = SSL_AD_PROTOCOL_VERSION;
		goto f_err;
		}
	data+=2;

	cookie_len = *(data++);
	if ( cookie_len > sizeof(s->d1->cookie))
		{
		al=SSL_AD_ILLEGAL_PARAMETER;
		goto f_err;
		}

	memcpy(s->d1->cookie, data, cookie_len);
	s->d1->cookie_len = cookie_len;

	s->d1->send_cookie = 1;
	return 1;

f_err:
	ssl3_send_alert(s, SSL3_AL_FATAL, al);
	return -1;
	}

int dtls1_send_client_key_exchange(SSL *s)
	{
	unsigned char *p,*d;
	int n;
	unsigned long l;
#ifndef OPENSSL_NO_RSA
	unsigned char *q;
	EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_KRB5
        KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */

	if (s->state == SSL3_ST_CW_KEY_EXCH_A)
		{
		d=(unsigned char *)s->init_buf->data;
		p= &(d[DTLS1_HM_HEADER_LENGTH]);

		l=s->s3->tmp.new_cipher->algorithms;

                /* Fool emacs indentation */
                if (0) {}
#ifndef OPENSSL_NO_RSA
		else if (l & SSL_kRSA)
			{
			RSA *rsa;
			unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];

			if (s->session->sess_cert->peer_rsa_tmp != NULL)
				rsa=s->session->sess_cert->peer_rsa_tmp;
			else
				{
				pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
				if ((pkey == NULL) ||
					(pkey->type != EVP_PKEY_RSA) ||
					(pkey->pkey.rsa == NULL))
					{
					SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
					goto err;
					}
				rsa=pkey->pkey.rsa;
				EVP_PKEY_free(pkey);
				}
				
			tmp_buf[0]=s->client_version>>8;
			tmp_buf[1]=s->client_version&0xff;
			if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
					goto err;

			s->session->master_key_length=sizeof tmp_buf;

			q=p;
			/* Fix buf for TLS and beyond */
			if (s->version > SSL3_VERSION)
				p+=2;
			n=RSA_public_encrypt(sizeof tmp_buf,
				tmp_buf,p,rsa,RSA_PKCS1_PADDING);
#ifdef PKCS1_CHECK
			if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
			if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
#endif
			if (n <= 0)
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
				goto err;
				}

			/* Fix buf for TLS and beyond */
			if (s->version > SSL3_VERSION)
				{
				s2n(n,q);
				n+=2;
				}

			s->session->master_key_length=
				s->method->ssl3_enc->generate_master_secret(s,
					s->session->master_key,
					tmp_buf,sizeof tmp_buf);
			OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
			}
#endif
#ifndef OPENSSL_NO_KRB5
		else if (l & SSL_kKRB5)
                        {
                        krb5_error_code	krb5rc;
                        KSSL_CTX	*kssl_ctx = s->kssl_ctx;
                        /*  krb5_data	krb5_ap_req;  */
                        krb5_data	*enc_ticket;
                        krb5_data	authenticator, *authp = NULL;
			EVP_CIPHER_CTX	ciph_ctx;
			EVP_CIPHER	*enc = NULL;
			unsigned char	iv[EVP_MAX_IV_LENGTH];
			unsigned char	tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
			unsigned char	epms[SSL_MAX_MASTER_KEY_LENGTH 
						+ EVP_MAX_IV_LENGTH];
			int 		padl, outl = sizeof(epms);

			EVP_CIPHER_CTX_init(&ciph_ctx);

#ifdef KSSL_DEBUG
                        printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
                                l, SSL_kKRB5);
#endif	/* KSSL_DEBUG */

			authp = NULL;
#ifdef KRB5SENDAUTH
			if (KRB5SENDAUTH)  authp = &authenticator;
#endif	/* KRB5SENDAUTH */

                        krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
				&kssl_err);
			enc = kssl_map_enc(kssl_ctx->enctype);
                        if (enc == NULL)
                            goto err;
#ifdef KSSL_DEBUG
                        {
                        printf("kssl_cget_tkt rtn %d\n", krb5rc);
                        if (krb5rc && kssl_err.text)
			  printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
                        }
#endif	/* KSSL_DEBUG */

                        if (krb5rc)
                                {
                                ssl3_send_alert(s,SSL3_AL_FATAL,
						SSL_AD_HANDSHAKE_FAILURE);
                                SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
						kssl_err.reason);
                                goto err;
                                }

			/*  20010406 VRS - Earlier versions used KRB5 AP_REQ
			**  in place of RFC 2712 KerberosWrapper, as in:
			**
                        **  Send ticket (copy to *p, set n = length)
                        **  n = krb5_ap_req.length;
                        **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
                        **  if (krb5_ap_req.data)  
                        **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
                        **
			**  Now using real RFC 2712 KerberosWrapper
			**  (Thanks to Simon Wilkinson <[e-mail]>)
			**  Note: 2712 "opaque" types are here replaced
			**  with a 2-byte length followed by the value.
			**  Example:
			**  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
			**  Where "xx xx" = length bytes.  Shown here with
			**  optional authenticator omitted.
			*/

			/*  KerberosWrapper.Ticket		*/
			s2n(enc_ticket->length,p);
			memcpy(p, enc_ticket->data, enc_ticket->length);
			p+= enc_ticket->length;
			n = enc_ticket->length + 2;

			/*  KerberosWrapper.Authenticator	*/
			if (authp  &&  authp->length)  
				{
				s2n(authp->length,p);
				memcpy(p, authp->data, authp->length);
				p+= authp->length;
				n+= authp->length + 2;
				
				free(authp->data);
				authp->data = NULL;
				authp->length = 0;
				}
			else
				{
				s2n(0,p);/*  null authenticator length	*/
				n+=2;
				}
 
			if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
			    goto err;

			/*  20010420 VRS.  Tried it this way; failed.
			**	EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
			**	EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
			**				kssl_ctx->length);
			**	EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
			*/

			memset(iv, 0, sizeof iv);  /* per RFC 1510 */
			EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
				kssl_ctx->key,iv);
			EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
				sizeof tmp_buf);
			EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
			outl += padl;
			if (outl > sizeof epms)
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
				goto err;
				}
			EVP_CIPHER_CTX_cleanup(&ciph_ctx);

			/*  KerberosWrapper.EncryptedPreMasterSecret	*/
			s2n(outl,p);
			memcpy(p, epms, outl);
			p+=outl;
			n+=outl + 2;

                        s->session->master_key_length=
                                s->method->ssl3_enc->generate_master_secret(s,
					s->session->master_key,
					tmp_buf, sizeof tmp_buf);

			OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
			OPENSSL_cleanse(epms, outl);
                        }
#endif
#ifndef OPENSSL_NO_DH
		else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
			{
			DH *dh_srvr,*dh_clnt;

			if (s->session->sess_cert->peer_dh_tmp != NULL)
				dh_srvr=s->session->sess_cert->peer_dh_tmp;
			else
				{
				/* we get them from the cert */
				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
				goto err;
				}
			
			/* generate a new random key */
			if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
				goto err;
				}
			if (!DH_generate_key(dh_clnt))
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
				goto err;
				}

			/* use the 'p' output buffer for the DH key, but
			 * make sure to clear it out afterwards */

			n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);

			if (n <= 0)
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
				goto err;
				}

			/* generate master key from the result */
			s->session->master_key_length=
				s->method->ssl3_enc->generate_master_secret(s,
					s->session->master_key,p,n);
			/* clean up */
			memset(p,0,n);

			/* send off the data */
			n=BN_num_bytes(dh_clnt->pub_key);
			s2n(n,p);
			BN_bn2bin(dh_clnt->pub_key,p);
			n+=2;

			DH_free(dh_clnt);

			/* perhaps clean things up a bit EAY EAY EAY EAY*/
			}
#endif
		else
			{
			ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
			SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
			goto err;
			}
		
		d = dtls1_set_message_header(s, d,
		SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
		/*
		 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
		 l2n3(n,d);
		 l2n(s->d1->handshake_write_seq,d);
		 s->d1->handshake_write_seq++;
		*/
		
		s->state=SSL3_ST_CW_KEY_EXCH_B;
		/* number of bytes to write */
		s->init_num=n+DTLS1_HM_HEADER_LENGTH;
		s->init_off=0;

		/* buffer the message to handle re-xmits */
		dtls1_buffer_message(s, 0);
		}
	
	/* SSL3_ST_CW_KEY_EXCH_B */
	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}

int dtls1_send_client_verify(SSL *s)
	{
	unsigned char *p,*d;
	unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
	EVP_PKEY *pkey;
#ifndef OPENSSL_NO_RSA
	unsigned u=0;
#endif
	unsigned long n;
#ifndef OPENSSL_NO_DSA
	int j;
#endif

	if (s->state == SSL3_ST_CW_CERT_VRFY_A)
		{
		d=(unsigned char *)s->init_buf->data;
		p= &(d[DTLS1_HM_HEADER_LENGTH]);
		pkey=s->cert->key->privatekey;

		s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
			&(data[MD5_DIGEST_LENGTH]));

#ifndef OPENSSL_NO_RSA
		if (pkey->type == EVP_PKEY_RSA)
			{
			s->method->ssl3_enc->cert_verify_mac(s,
				&(s->s3->finish_dgst1),&(data[0]));
			if (RSA_sign(NID_md5_sha1, data,
					 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
					&(p[2]), &u, pkey->pkey.rsa) <= 0 )
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
				goto err;
				}
			s2n(u,p);
			n=u+2;
			}
		else
#endif
#ifndef OPENSSL_NO_DSA
			if (pkey->type == EVP_PKEY_DSA)
			{
			if (!DSA_sign(pkey->save_type,
				&(data[MD5_DIGEST_LENGTH]),
				SHA_DIGEST_LENGTH,&(p[2]),
				(unsigned int *)&j,pkey->pkey.dsa))
				{
				SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
				goto err;
				}
			s2n(j,p);
			n=j+2;
			}
		else
#endif
			{
			SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
			goto err;
			}

		d = dtls1_set_message_header(s, d,
			SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;

		s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
		s->init_off=0;

		/* buffer the message to handle re-xmits */
		dtls1_buffer_message(s, 0);

		s->state = SSL3_ST_CW_CERT_VRFY_B;
		}

	/* s->state = SSL3_ST_CW_CERT_VRFY_B */
	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}

int dtls1_send_client_certificate(SSL *s)
	{
	X509 *x509=NULL;
	EVP_PKEY *pkey=NULL;
	int i;
	unsigned long l;

	if (s->state ==	SSL3_ST_CW_CERT_A)
		{
		if ((s->cert == NULL) ||
			(s->cert->key->x509 == NULL) ||
			(s->cert->key->privatekey == NULL))
			s->state=SSL3_ST_CW_CERT_B;
		else
			s->state=SSL3_ST_CW_CERT_C;
		}

	/* We need to get a client cert */
	if (s->state == SSL3_ST_CW_CERT_B)
		{
		/* If we get an error, we need to
		 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
		 * We then get retied later */
		i=0;
		if (s->ctx->client_cert_cb != NULL)
			i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
		if (i < 0)
			{
			s->rwstate=SSL_X509_LOOKUP;
			return(-1);
			}
		s->rwstate=SSL_NOTHING;
		if ((i == 1) && (pkey != NULL) && (x509 != NULL))
			{
			s->state=SSL3_ST_CW_CERT_B;
			if (	!SSL_use_certificate(s,x509) ||
				!SSL_use_PrivateKey(s,pkey))
				i=0;
			}
		else if (i == 1)
			{
			i=0;
			SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
			}

		if (x509 != NULL) X509_free(x509);
		if (pkey != NULL) EVP_PKEY_free(pkey);
		if (i == 0)
			{
			if (s->version == SSL3_VERSION)
				{
				s->s3->tmp.cert_req=0;
				ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
				return(1);
				}
			else
				{
				s->s3->tmp.cert_req=2;
				}
			}

		/* Ok, we have a cert */
		s->state=SSL3_ST_CW_CERT_C;
		}

	if (s->state == SSL3_ST_CW_CERT_C)
		{
		s->state=SSL3_ST_CW_CERT_D;
		l=dtls1_output_cert_chain(s,
			(s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
		s->init_num=(int)l;
		s->init_off=0;

		/* set header called by dtls1_output_cert_chain() */

		/* buffer the message to handle re-xmits */
		dtls1_buffer_message(s, 0);
		}
	/* SSL3_ST_CW_CERT_D */
	return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
	}