s2_clnt.c

mediastreamer2是开源的网络传输媒体流的库

		p=buf;					/* header */
		d=p+9;					/* data section */
		*(p++)=SSL2_MT_CLIENT_HELLO;		/* type */
		s2n(SSL2_VERSION,p);			/* version */
		n=j=0;

		n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
		d+=n;

		if (n == 0)
			{
			SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
			return(-1);
			}

		s2n(n,p);			/* cipher spec num bytes */

		if ((s->session->session_id_length > 0) &&
			(s->session->session_id_length <=
			SSL2_MAX_SSL_SESSION_ID_LENGTH))
			{
			i=s->session->session_id_length;
			s2n(i,p);		/* session id length */
			memcpy(d,s->session->session_id,(unsigned int)i);
			d+=i;
			}
		else
			{
			s2n(0,p);
			}

		s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
		s2n(SSL2_CHALLENGE_LENGTH,p);		/* challenge length */
		/*challenge id data*/
		if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
			return -1;
		memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
		d+=SSL2_CHALLENGE_LENGTH;

		s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
		s->init_num=d-buf;
		s->init_off=0;
		}
	/* SSL2_ST_SEND_CLIENT_HELLO_B */
	return(ssl2_do_write(s));
	}

static int client_master_key(SSL *s)
	{
	unsigned char *buf;
	unsigned char *p,*d;
	int clear,enc,karg,i;
	SSL_SESSION *sess;
	const EVP_CIPHER *c;
	const EVP_MD *md;

	buf=(unsigned char *)s->init_buf->data;
	if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
		{

		if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
			{
			ssl2_return_error(s,SSL2_PE_NO_CIPHER);
			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
			return(-1);
			}
		sess=s->session;
		p=buf;
		d=p+10;
		*(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */

		i=ssl_put_cipher_by_char(s,sess->cipher,p);
		p+=i;

		/* make key_arg data */
		i=EVP_CIPHER_iv_length(c);
		sess->key_arg_length=i;
		if (i > SSL_MAX_KEY_ARG_LENGTH)
			{
			ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
			SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
			return -1;
			}
		if (i > 0)
			if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
				return -1;

		/* make a master key */
		i=EVP_CIPHER_key_length(c);
		sess->master_key_length=i;
		if (i > 0)
			{
			if (i > (int)sizeof(sess->master_key))
				{
				ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
				SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
				return -1;
				}
			if (RAND_bytes(sess->master_key,i) <= 0)
				{
				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
				return(-1);
				}
			}

		if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
			enc=8;
		else if (SSL_C_IS_EXPORT(sess->cipher))
			enc=5;
		else
			enc=i;

		if ((int)i < enc)
			{
			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
			return(-1);
			}
		clear=i-enc;
		s2n(clear,p);
		memcpy(d,sess->master_key,(unsigned int)clear);
		d+=clear;

		enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
			&(sess->master_key[clear]),d,
			(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
		if (enc <= 0)
			{
			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
			SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
			return(-1);
			}
#ifdef PKCS1_CHECK
		if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
		if (s->options & SSL_OP_PKCS1_CHECK_2)
			sess->master_key[clear]++;
#endif
		s2n(enc,p);
		d+=enc;
		karg=sess->key_arg_length;	
		s2n(karg,p); /* key arg size */
		if (karg > (int)sizeof(sess->key_arg))
			{
			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
			SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
			return -1;
			}
		memcpy(d,sess->key_arg,(unsigned int)karg);
		d+=karg;

		s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
		s->init_num=d-buf;
		s->init_off=0;
		}

	/* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
	return(ssl2_do_write(s));
	}

static int client_finished(SSL *s)
	{
	unsigned char *p;

	if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
		{
		p=(unsigned char *)s->init_buf->data;
		*(p++)=SSL2_MT_CLIENT_FINISHED;
		if (s->s2->conn_id_length > sizeof s->s2->conn_id)
			{
			SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
			return -1;
			}
		memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);

		s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
		s->init_num=s->s2->conn_id_length+1;
		s->init_off=0;
		}
	return(ssl2_do_write(s));
	}

/* read the data and then respond */
static int client_certificate(SSL *s)
	{
	unsigned char *buf;
	unsigned char *p,*d;
	int i;
	unsigned int n;
	int cert_ch_len;
	unsigned char *cert_ch;

	buf=(unsigned char *)s->init_buf->data;

	/* We have a cert associated with the SSL, so attach it to
	 * the session if it does not have one */

	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
		{
		i=ssl2_read(s,(char *)&(buf[s->init_num]),
			SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
		if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
			return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
		s->init_num += i;
		if (s->msg_callback)
			s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */

		/* type=buf[0]; */
		/* type eq x509 */
		if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
			{
			ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
			SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
			return(-1);
			}

		if ((s->cert == NULL) ||
			(s->cert->key->x509 == NULL) ||
			(s->cert->key->privatekey == NULL))
			{
			s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
			}
		else
			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
		}

	cert_ch = buf + 2;
	cert_ch_len = s->init_num - 2;

	if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
		{
		X509 *x509=NULL;
		EVP_PKEY *pkey=NULL;

		/* If we get an error we need to
		 * ssl->rwstate=SSL_X509_LOOKUP;
		 * return(error);
		 * We should then be retried when things are ok and we
		 * can get a cert or not */

		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=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
			if (	!SSL_use_certificate(s,x509) || 
				!SSL_use_PrivateKey(s,pkey))
				{
				i=0;
				}
			X509_free(x509);
			EVP_PKEY_free(pkey);
			}
		else if (i == 1)
			{
			if (x509 != NULL) X509_free(x509);
			if (pkey != NULL) EVP_PKEY_free(pkey);
			SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
			i=0;
			}

		if (i == 0)
			{
			/* We have no client certificate to respond with
			 * so send the correct error message back */
			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
			p=buf;
			*(p++)=SSL2_MT_ERROR;
			s2n(SSL2_PE_NO_CERTIFICATE,p);
			s->init_off=0;
			s->init_num=3;
			/* Write is done at the end */
			}
		}

	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
		{
		return(ssl2_do_write(s));
		}

	if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
		{
		EVP_MD_CTX ctx;

		/* ok, now we calculate the checksum
		 * do it first so we can reuse buf :-) */
		p=buf;
		EVP_MD_CTX_init(&ctx);
		EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
		EVP_SignUpdate(&ctx,s->s2->key_material,
			       s->s2->key_material_length);
		EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
		n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
		EVP_SignUpdate(&ctx,buf,(unsigned int)n);

		p=buf;
		d=p+6;
		*(p++)=SSL2_MT_CLIENT_CERTIFICATE;
		*(p++)=SSL2_CT_X509_CERTIFICATE;
		n=i2d_X509(s->cert->key->x509,&d);
		s2n(n,p);

		if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
			{
			/* this is not good.  If things have failed it
			 * means there so something wrong with the key.
			 * We will continue with a 0 length signature
			 */
			}
		EVP_MD_CTX_cleanup(&ctx);
		s2n(n,p);
		d+=n;

		s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
		s->init_num=d-buf;
		s->init_off=0;
		}
	/* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
	return(ssl2_do_write(s));
	}

static int get_server_verify(SSL *s)
	{
	unsigned char *p;
	int i, n, len;

	p=(unsigned char *)s->init_buf->data;
	if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
		{
		i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
		if (i < (1-s->init_num)) 
			return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
		s->init_num += i;

		s->state= SSL2_ST_GET_SERVER_VERIFY_B;
		if (*p != SSL2_MT_SERVER_VERIFY)
			{
			if (p[0] != SSL2_MT_ERROR)
				{
				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
				SSLerr(SSL_F_GET_SERVER_VERIFY,
					SSL_R_READ_WRONG_PACKET_TYPE);
				}
			else
				{
				SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
				/* try to read the error message */
				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
				}
			return(-1);
			}
		}
	
	p=(unsigned char *)s->init_buf->data;
	len = 1 + s->s2->challenge_length;
	n =  len - s->init_num;
	i = ssl2_read(s,(char *)&(p[s->init_num]),n);
	if (i < n)
		return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
	if (s->msg_callback)
		s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
	p += 1;

	if (memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
		{
		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
		SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
		return(-1);
		}
	return(1);
	}

static int get_server_finished(SSL *s)
	{
	unsigned char *buf;
	unsigned char *p;
	int i, n, len;

	buf=(unsigned char *)s->init_buf->data;
	p=buf;
	if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
		{
		i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
		if (i < (1-s->init_num))
			return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
		s->init_num += i;

		if (*p == SSL2_MT_REQUEST_CERTIFICATE)
			{
			s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
			return(1);
			}
		else if (*p != SSL2_MT_SERVER_FINISHED)
			{
			if (p[0] != SSL2_MT_ERROR)
				{
				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
				}
			else
				{
				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
				/* try to read the error message */
				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
				}
			return(-1);
			}
		s->state=SSL2_ST_GET_SERVER_FINISHED_B;
		}

	len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
	n = len - s->init_num;
	i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
	if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
		return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
	s->init_num += i;
	if (s->msg_callback)
		s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */

	if (!s->hit) /* new session */
		{
		/* new session-id */
		/* Make sure we were not trying to re-use an old SSL_SESSION
		 * or bad things can happen */
		/* ZZZZZZZZZZZZZ */
		s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
		memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
		}
	else
		{
		if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
			{
			if ((s->session->session_id_length > sizeof s->session->session_id)
			    || (0 != memcmp(buf + 1, s->session->session_id,
			                    (unsigned int)s->session->session_id_length)))
				{
				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
				SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
				return(-1);
				}
			}
		}
	s->state = SSL_ST_OK;
	return(1);
	}

/* loads in the certificate from the server */
int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
	{
	STACK_OF(X509) *sk=NULL;
	EVP_PKEY *pkey=NULL;
	SESS_CERT *sc=NULL;
	int i;
	X509 *x509=NULL;
	int ret=0;
	
	x509=d2i_X509(NULL,&data,(long)len);
	if (x509 == NULL)
		{
		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
		goto err;
		}

	if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
		{
		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	i=ssl_verify_cert_chain(s,sk);
		
	if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
		{
		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
		goto err;
		}
	ERR_clear_error(); /* but we keep s->verify_result */
	s->session->verify_result = s->verify_result;

	/* server's cert for this session */
	sc=ssl_sess_cert_new();
	if (sc == NULL)
		{
		ret= -1;
		goto err;
		}
	if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
	s->session->sess_cert=sc;

	sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
	sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);

	pkey=X509_get_pubkey(x509);
	x509=NULL;
	if (pkey == NULL)
		{
		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
		goto err;
		}
	if (pkey->type != EVP_PKEY_RSA)
		{
		SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
		goto err;
		}

	if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
		goto err;
	ret=1;
err:
	sk_X509_free(sk);
	X509_free(x509);
	EVP_PKEY_free(pkey);
	return(ret);
	}

static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
	     unsigned char *to, int padding)
	{
	EVP_PKEY *pkey=NULL;
	int i= -1;

	if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
		((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
		{
		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
		return(-1);
		}
	if (pkey->type != EVP_PKEY_RSA)
		{
		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
		goto end;
		}

	/* we have the public key */
	i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
	if (i < 0)
		SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
end:
	EVP_PKEY_free(pkey);
	return(i);
	}
#else /* !OPENSSL_NO_SSL2 */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif