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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 "shim.h"
import "C"
import (
"os"
"unsafe"
)
type SSLTLSExtErr int
const (
SSLTLSExtErrOK SSLTLSExtErr = C.SSL_TLSEXT_ERR_OK
SSLTLSExtErrAlertWarning SSLTLSExtErr = C.SSL_TLSEXT_ERR_ALERT_WARNING
SSLTLSEXTErrAlertFatal SSLTLSExtErr = C.SSL_TLSEXT_ERR_ALERT_FATAL
SSLTLSEXTErrNoAck SSLTLSExtErr = C.SSL_TLSEXT_ERR_NOACK
)
var (
ssl_idx = C.X_SSL_new_index()
)
//export get_ssl_idx
func get_ssl_idx() C.int {
return ssl_idx
}
type SSL struct {
ssl *C.SSL
verify_cb VerifyCallback
}
//export go_ssl_verify_cb_thunk
func go_ssl_verify_cb_thunk(p unsafe.Pointer, ok C.int, ctx *C.X509_STORE_CTX) C.int {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: verify callback panic'd: %v", err)
os.Exit(1)
}
}()
verify_cb := (*SSL)(p).verify_cb
// set up defaults just in case verify_cb is nil
if verify_cb != nil {
store := &CertificateStoreCtx{ctx: ctx}
if verify_cb(ok == 1, store) {
ok = 1
} else {
ok = 0
}
}
return ok
}
// Wrapper around SSL_get_servername. Returns server name according to rfc6066
// http://tools.ietf.org/html/rfc6066.
func (s *SSL) GetServername() string {
return C.GoString(C.SSL_get_servername(s.ssl, C.TLSEXT_NAMETYPE_host_name))
}
// GetOptions returns SSL options. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
func (s *SSL) GetOptions() Options {
return Options(C.X_SSL_get_options(s.ssl))
}
// SetOptions sets SSL options. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
func (s *SSL) SetOptions(options Options) Options {
return Options(C.X_SSL_set_options(s.ssl, C.long(options)))
}
// ClearOptions clear SSL options. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
func (s *SSL) ClearOptions(options Options) Options {
return Options(C.X_SSL_clear_options(s.ssl, C.long(options)))
}
// SetVerify controls peer verification settings. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) SetVerify(options VerifyOptions, verify_cb VerifyCallback) {
s.verify_cb = verify_cb
if verify_cb != nil {
C.SSL_set_verify(s.ssl, C.int(options), (*[0]byte)(C.X_SSL_verify_cb))
} else {
C.SSL_set_verify(s.ssl, C.int(options), nil)
}
}
// SetVerifyMode controls peer verification setting. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) SetVerifyMode(options VerifyOptions) {
s.SetVerify(options, s.verify_cb)
}
// SetVerifyCallback controls peer verification setting. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) SetVerifyCallback(verify_cb VerifyCallback) {
s.SetVerify(s.VerifyMode(), verify_cb)
}
// GetVerifyCallback returns callback function. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) GetVerifyCallback() VerifyCallback {
return s.verify_cb
}
// VerifyMode returns peer verification setting. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) VerifyMode() VerifyOptions {
return VerifyOptions(C.SSL_get_verify_mode(s.ssl))
}
// SetVerifyDepth controls how many certificates deep the certificate
// verification logic is willing to follow a certificate chain. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) SetVerifyDepth(depth int) {
C.SSL_set_verify_depth(s.ssl, C.int(depth))
}
// GetVerifyDepth controls how many certificates deep the certificate
// verification logic is willing to follow a certificate chain. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (s *SSL) GetVerifyDepth() int {
return int(C.SSL_get_verify_depth(s.ssl))
}
// SetSSLCtx changes context to new one. Useful for Server Name Indication (SNI)
// rfc6066 http://tools.ietf.org/html/rfc6066. See
// http://stackoverflow.com/questions/22373332/serving-multiple-domains-in-one-box-with-sni
func (s *SSL) SetSSLCtx(ctx *Ctx) {
/*
* SSL_set_SSL_CTX() only changes certs as of 1.0.0d
* adjust other things we care about
*/
C.SSL_set_SSL_CTX(s.ssl, ctx.ctx)
}
//export sni_cb_thunk
func sni_cb_thunk(p unsafe.Pointer, con *C.SSL, ad unsafe.Pointer, arg unsafe.Pointer) C.int {
defer func() {
if err := recover(); err != nil {
logger.Critf("openssl: verify callback sni panic'd: %v", err)
os.Exit(1)
}
}()
sni_cb := (*Ctx)(p).sni_cb
s := &SSL{ssl: con}
// This attaches a pointer to our SSL struct into the SNI callback.
C.SSL_set_ex_data(s.ssl, get_ssl_idx(), unsafe.Pointer(s))
// Note: this is ctx.sni_cb, not C.sni_cb
return C.int(sni_cb(s))
}
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