s3_both.c

来自「一个用于点对点传输加密的工具包源码」· C语言 代码 · 共 589 行 · 第 1/2 页

			/* Count is one too high since the X509_STORE_get uped the
			 * ref count */
			X509_free(x);
			}

		X509_STORE_CTX_cleanup(&xs_ctx);
		}

	/* Thawte special :-) */
	if (s->ctx->extra_certs != NULL)
	for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
		{
		x=sk_X509_value(s->ctx->extra_certs,i);
		n=i2d_X509(x,NULL);
		if (!BUF_MEM_grow(buf,(int)(n+l+3)))
			{
			SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
			return(0);
			}
		p=(unsigned char *)&(buf->data[l]);
		l2n3(n,p);
		i2d_X509(x,&p);
		l+=n+3;
		}

	l-=7;
	p=(unsigned char *)&(buf->data[4]);
	l2n3(l,p);
	l+=3;
	p=(unsigned char *)&(buf->data[0]);
	*(p++)=SSL3_MT_CERTIFICATE;
	l2n3(l,p);
	l+=4;
	return(l);
	}

/* Obtain handshake message of message type 'mt' (any if mt == -1),
 * maximum acceptable body length 'max'.
 * The first four bytes (msg_type and length) are read in state 'st1',
 * the body is read in state 'stn'.
 */
long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
	{
	unsigned char *p;
	unsigned long l;
	long n;
	int i,al;

	if (s->s3->tmp.reuse_message)
		{
		s->s3->tmp.reuse_message=0;
		if ((mt >= 0) && (s->s3->tmp.message_type != mt))
			{
			al=SSL_AD_UNEXPECTED_MESSAGE;
			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
			goto f_err;
			}
		*ok=1;
		return((int)s->s3->tmp.message_size);
		}

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

	if (s->state == st1) /* s->init_num < 4 */
		{
		int skip_message;

		do
			{
			while (s->init_num < 4)
				{
				i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
					4 - s->init_num);
				if (i <= 0)
					{
					s->rwstate=SSL_READING;
					*ok = 0;
					return i;
					}
				s->init_num+=i;
				}
			
			skip_message = 0;
			if (!s->server)
				if (p[0] == SSL3_MT_HELLO_REQUEST)
					/* The server may always send 'Hello Request' messages --
					 * we are doing a handshake anyway now, so ignore them
					 * if their format is correct. Does not count for
					 * 'Finished' MAC. */
					if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
						skip_message = 1;
			}
		while (skip_message);

		/* s->init_num == 4 */

		if ((mt >= 0) && (*p != mt))
			{
			al=SSL_AD_UNEXPECTED_MESSAGE;
			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
			goto f_err;
			}
		if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
					(st1 == SSL3_ST_SR_CERT_A) &&
					(stn == SSL3_ST_SR_CERT_B))
			{
			/* At this point we have got an MS SGC second client
			 * hello (maybe we should always allow the client to
			 * start a new handshake?). We need to restart the mac.
			 * Don't increment {num,total}_renegotiations because
			 * we have not completed the handshake. */
			ssl3_init_finished_mac(s);
			}

		ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 4);
			
		s->s3->tmp.message_type= *(p++);

		n2l3(p,l);
		if (l > (unsigned long)max)
			{
			al=SSL_AD_ILLEGAL_PARAMETER;
			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
			goto f_err;
			}
		if (l && !BUF_MEM_grow(s->init_buf,(int)l))
			{
			SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
			goto err;
			}
		s->s3->tmp.message_size=l;
		s->state=stn;

		s->init_num=0;
		}

	/* next state (stn) */
	p=(unsigned char *)s->init_buf->data;
	n=s->s3->tmp.message_size;
	while (n > 0)
		{
		i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
		if (i <= 0)
			{
			s->rwstate=SSL_READING;
			*ok = 0;
			return i;
			}
		s->init_num += i;
		n -= i;
		}
	ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num);
	*ok=1;
	return s->init_num;
f_err:
	ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
	*ok=0;
	return(-1);
	}

int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
	{
	EVP_PKEY *pk;
	int ret= -1,i,j;

	if (pkey == NULL)
		pk=X509_get_pubkey(x);
	else
		pk=pkey;
	if (pk == NULL) goto err;

	i=pk->type;
	if (i == EVP_PKEY_RSA)
		{
		ret=SSL_PKEY_RSA_ENC;
		if (x != NULL)
			{
			j=X509_get_ext_count(x);
			/* check to see if this is a signing only certificate */
			/* EAY EAY EAY EAY */
			}
		}
	else if (i == EVP_PKEY_DSA)
		{
		ret=SSL_PKEY_DSA_SIGN;
		}
	else if (i == EVP_PKEY_DH)
		{
		/* if we just have a key, we needs to be guess */

		if (x == NULL)
			ret=SSL_PKEY_DH_DSA;
		else
			{
			j=X509_get_signature_type(x);
			if (j == EVP_PKEY_RSA)
				ret=SSL_PKEY_DH_RSA;
			else if (j== EVP_PKEY_DSA)
				ret=SSL_PKEY_DH_DSA;
			else ret= -1;
			}
		}
	else
		ret= -1;

err:
	if(!pkey) EVP_PKEY_free(pk);
	return(ret);
	}

int ssl_verify_alarm_type(long type)
	{
	int al;

	switch(type)
		{
	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
	case X509_V_ERR_UNABLE_TO_GET_CRL:
		al=SSL_AD_UNKNOWN_CA;
		break;
	case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
	case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
	case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
	case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
	case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
	case X509_V_ERR_CERT_NOT_YET_VALID:
	case X509_V_ERR_CRL_NOT_YET_VALID:
		al=SSL_AD_BAD_CERTIFICATE;
		break;
	case X509_V_ERR_CERT_SIGNATURE_FAILURE:
	case X509_V_ERR_CRL_SIGNATURE_FAILURE:
		al=SSL_AD_DECRYPT_ERROR;
		break;
	case X509_V_ERR_CERT_HAS_EXPIRED:
	case X509_V_ERR_CRL_HAS_EXPIRED:
		al=SSL_AD_CERTIFICATE_EXPIRED;
		break;
	case X509_V_ERR_CERT_REVOKED:
		al=SSL_AD_CERTIFICATE_REVOKED;
		break;
	case X509_V_ERR_OUT_OF_MEM:
		al=SSL_AD_INTERNAL_ERROR;
		break;
	case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
	case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
	case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
	case X509_V_ERR_CERT_CHAIN_TOO_LONG:
		al=SSL_AD_UNKNOWN_CA;
		break;
	case X509_V_ERR_APPLICATION_VERIFICATION:
		al=SSL_AD_HANDSHAKE_FAILURE;
		break;
	default:
		al=SSL_AD_CERTIFICATE_UNKNOWN;
		break;
		}
	return(al);
	}

int ssl3_setup_buffers(SSL *s)
	{
	unsigned char *p;
	unsigned int extra;

	if (s->s3->rbuf.buf == NULL)
		{
		if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
			extra=SSL3_RT_MAX_EXTRA;
		else
			extra=0;
		if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
			== NULL)
			goto err;
		s->s3->rbuf.buf=p;
		}

	if (s->s3->wbuf.buf == NULL)
		{
		if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE))
			== NULL)
			goto err;
		s->s3->wbuf.buf=p;
		}
	s->packet= &(s->s3->rbuf.buf[0]);
	return(1);
err:
	SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
	return(0);
	}