s3_srvr.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 1,755 行 · 第 1/3 页

		/* get the list of acceptable cert types */
		p++;
		n=ssl3_get_req_cert_type(s,p);
		d[0]=n;
		p+=n;
		n++;

		off=n;
		p+=2;
		n+=2;

		sk=SSL_get_client_CA_list(s);
		nl=0;
		if (sk != NULL)
			{
			for (i=0; i<sk_X509_NAME_num(sk); i++)
				{
				name=sk_X509_NAME_value(sk,i);
				j=i2d_X509_NAME(name,NULL);
				if (!BUF_MEM_grow(buf,4+n+j+2))
					{
					SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
					goto err;
					}
				p=(unsigned char *)&(buf->data[4+n]);
				if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
					{
					s2n(j,p);
					i2d_X509_NAME(name,&p);
					n+=2+j;
					nl+=2+j;
					}
				else
					{
					d=p;
					i2d_X509_NAME(name,&p);
					j-=2; s2n(j,d); j+=2;
					n+=j;
					nl+=j;
					}
				}
			}
		/* else no CA names */
		p=(unsigned char *)&(buf->data[4+off]);
		s2n(nl,p);

		d=(unsigned char *)buf->data;
		*(d++)=SSL3_MT_CERTIFICATE_REQUEST;
		l2n3(n,d);

		/* we should now have things packed up, so lets send
		 * it off */

		s->init_num=n+4;
		s->init_off=0;
#ifdef NETSCAPE_HANG_BUG
		p=(unsigned char *)s->init_buf->data + s->init_num;

		/* do the header */
		*(p++)=SSL3_MT_SERVER_DONE;
		*(p++)=0;
		*(p++)=0;
		*(p++)=0;
		s->init_num += 4;
#endif

		}

	/* SSL3_ST_SW_CERT_REQ_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}

static int ssl3_get_client_key_exchange(SSL *s)
	{
	int i,al,ok;
	long n;
	unsigned long l;
	unsigned char *p;
#ifndef NO_RSA
	RSA *rsa=NULL;
	EVP_PKEY *pkey=NULL;
#endif
#ifndef NO_DH
	BIGNUM *pub=NULL;
	DH *dh_srvr;
#endif

	n=ssl3_get_message(s,
		SSL3_ST_SR_KEY_EXCH_A,
		SSL3_ST_SR_KEY_EXCH_B,
		SSL3_MT_CLIENT_KEY_EXCHANGE,
		400, /* ???? */
		&ok);

	if (!ok) return((int)n);
	p=(unsigned char *)s->init_buf->data;

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

#ifndef NO_RSA
	if (l & SSL_kRSA)
		{
		/* FIX THIS UP EAY EAY EAY EAY */
		if (s->s3->tmp.use_rsa_tmp)
			{
			if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
				rsa=s->cert->rsa_tmp;
			/* Don't do a callback because rsa_tmp should
			 * be sent already */
			if (rsa == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
				goto f_err;

				}
			}
		else
			{
			pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
			if (	(pkey == NULL) ||
				(pkey->type != EVP_PKEY_RSA) ||
				(pkey->pkey.rsa == NULL))
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
				goto f_err;
				}
			rsa=pkey->pkey.rsa;
			}

		/* TLS */
		if (s->version > SSL3_VERSION)
			{
			n2s(p,i);
			if (n != i+2)
				{
				if (!(s->options & SSL_OP_TLS_D5_BUG))
					{
					SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
					goto err;
					}
				else
					p-=2;
				}
			else
				n=i;
			}

		i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);

		if (i != SSL_MAX_MASTER_KEY_LENGTH)
			{
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
			goto f_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 the negotiated protocol
			 * version instead if the server does not support the requested
			 * protocol version.
			 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
			if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
				(p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
				{
				al=SSL_AD_DECODE_ERROR;
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
				goto f_err;
				}
			}

		s->session->master_key_length=
			s->method->ssl3_enc->generate_master_secret(s,
				s->session->master_key,
				p,i);
		memset(p,0,i);
		}
	else
#endif
#ifndef NO_DH
		if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
		{
		n2s(p,i);
		if (n != i+2)
			{
			if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
				goto err;
				}
			else
				{
				p-=2;
				i=(int)n;
				}
			}

		if (n == 0L) /* the parameters are in the cert */
			{
			al=SSL_AD_HANDSHAKE_FAILURE;
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
			goto f_err;
			}
		else
			{
			if (s->s3->tmp.dh == NULL)
				{
				al=SSL_AD_HANDSHAKE_FAILURE;
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
				goto f_err;
				}
			else
				dh_srvr=s->s3->tmp.dh;
			}

		pub=BN_bin2bn(p,i,NULL);
		if (pub == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
			goto err;
			}

		i=DH_compute_key(p,pub,dh_srvr);

		if (i <= 0)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
			goto err;
			}

		DH_free(s->s3->tmp.dh);
		s->s3->tmp.dh=NULL;

		BN_clear_free(pub);
		pub=NULL;
		s->session->master_key_length=
			s->method->ssl3_enc->generate_master_secret(s,
				s->session->master_key,p,i);
		}
	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(NO_DH) || !defined(NO_RSA)
err:
#endif
	return(-1);
	}

static 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=ssl3_get_message(s,
		SSL3_ST_SR_CERT_VRFY_A,
		SSL3_ST_SR_CERT_VRFY_B,
		-1,
		512, /* 512? */
		&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_buf->data;
	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 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 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
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_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);
	}

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

	n=ssl3_get_message(s,
		SSL3_ST_SR_CERT_A,
		SSL3_ST_SR_CERT_B,
		-1,
#if defined(MSDOS) && !defined(WIN32)
		1024*30, /* 30k max cert list :-) */
#else
		1024*100, /* 100k max cert list :-) */
#endif
		&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;
		}
	d=p=(unsigned char *)s->init_buf->data;

	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)
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_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));
	}