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// Copyright (C) 2017. See AUTHORS.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openssl
/*
#include <openssl/ssl.h>
#include <openssl/conf.h>
#include <openssl/x509.h>
#ifndef X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT
#define X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT 0x1
#define X509_CHECK_FLAG_NO_WILDCARDS 0x2
extern int X509_check_host(X509 *x, const char *chk, size_t chklen,
unsigned int flags, char **peername);
extern int X509_check_email(X509 *x, const char *chk, size_t chklen,
unsigned int flags);
extern int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
unsigned int flags);
#endif
*/
import "C"
import (
"errors"
"net"
"runtime"
"unsafe"
)
var (
ValidationError = errors.New("Host validation error")
)
type CheckFlags int
const (
AlwaysCheckSubject CheckFlags = C.X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT
NoWildcards CheckFlags = C.X509_CHECK_FLAG_NO_WILDCARDS
)
// CheckHost checks that the X509 certificate is signed for the provided
// host name. See http://www.openssl.org/docs/crypto/X509_check_host.html for
// more. Note that CheckHost does not check the IP field. See VerifyHostname.
// Specifically returns ValidationError if the Certificate didn't match but
// there was no internal error.
func (c *Certificate) CheckHost(host string, flags CheckFlags) error {
chost := unsafe.Pointer(C.CString(host))
defer C.free(chost)
rv := C.X509_check_host(c.x, (*C.char)(chost), C.size_t(len(host)),
C.uint(flags), nil)
runtime.KeepAlive(c)
if rv > 0 {
return nil
}
if rv == 0 {
return ValidationError
}
return errors.New("hostname validation had an internal failure")
}
// CheckEmail checks that the X509 certificate is signed for the provided
// email address. See http://www.openssl.org/docs/crypto/X509_check_host.html
// for more.
// Specifically returns ValidationError if the Certificate didn't match but
// there was no internal error.
func (c *Certificate) CheckEmail(email string, flags CheckFlags) error {
cemail := unsafe.Pointer(C.CString(email))
defer C.free(cemail)
rv := C.X509_check_email(c.x, (*C.char)(cemail), C.size_t(len(email)),
C.uint(flags))
runtime.KeepAlive(c)
if rv > 0 {
return nil
}
if rv == 0 {
return ValidationError
}
return errors.New("email validation had an internal failure")
}
// CheckIP checks that the X509 certificate is signed for the provided
// IP address. See http://www.openssl.org/docs/crypto/X509_check_host.html
// for more.
// Specifically returns ValidationError if the Certificate didn't match but
// there was no internal error.
func (c *Certificate) CheckIP(ip net.IP, flags CheckFlags) error {
// X509_check_ip will fail to validate the 16-byte representation of an IPv4
// address, so convert to the 4-byte representation.
if ip4 := ip.To4(); ip4 != nil {
ip = ip4
}
cip := unsafe.Pointer(&ip[0])
rv := C.X509_check_ip(c.x, (*C.uchar)(cip), C.size_t(len(ip)),
C.uint(flags))
runtime.KeepAlive(c)
if rv > 0 {
return nil
}
if rv == 0 {
return ValidationError
}
return errors.New("ip validation had an internal failure")
}
// VerifyHostname is a combination of CheckHost and CheckIP. If the provided
// hostname looks like an IP address, it will be checked as an IP address,
// otherwise it will be checked as a hostname.
// Specifically returns ValidationError if the Certificate didn't match but
// there was no internal error.
func (c *Certificate) VerifyHostname(host string) error {
var ip net.IP
if len(host) >= 3 && host[0] == '[' && host[len(host)-1] == ']' {
ip = net.ParseIP(host[1 : len(host)-1])
} else {
ip = net.ParseIP(host)
}
if ip != nil {
return c.CheckIP(ip, 0)
}
return c.CheckHost(host, 0)
}
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