status-go/vendor/github.com/libp2p/go-openssl/ctx.go

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2019-06-09 07:24:20 +00:00
// 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 (
"errors"
"fmt"
"io/ioutil"
"os"
"runtime"
"sync"
"time"
"unsafe"
"github.com/spacemonkeygo/spacelog"
)
var (
ssl_ctx_idx = C.X_SSL_CTX_new_index()
logger = spacelog.GetLogger()
)
type Ctx struct {
ctx *C.SSL_CTX
cert *Certificate
chain []*Certificate
key PrivateKey
verify_cb VerifyCallback
sni_cb TLSExtServernameCallback
ticket_store_mu sync.Mutex
ticket_store *TicketStore
}
//export get_ssl_ctx_idx
func get_ssl_ctx_idx() C.int {
return ssl_ctx_idx
}
func newCtx(method *C.SSL_METHOD) (*Ctx, error) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ctx := C.SSL_CTX_new(method)
if ctx == nil {
return nil, errorFromErrorQueue()
}
c := &Ctx{ctx: ctx}
C.SSL_CTX_set_ex_data(ctx, get_ssl_ctx_idx(), unsafe.Pointer(c))
runtime.SetFinalizer(c, func(c *Ctx) {
C.SSL_CTX_free(c.ctx)
})
return c, nil
}
type SSLVersion int
const (
SSLv3 SSLVersion = 0x02 // Vulnerable to "POODLE" attack.
TLSv1 SSLVersion = 0x03
TLSv1_1 SSLVersion = 0x04
TLSv1_2 SSLVersion = 0x05
// Make sure to disable SSLv2 and SSLv3 if you use this. SSLv3 is vulnerable
// to the "POODLE" attack, and SSLv2 is what, just don't even.
AnyVersion SSLVersion = 0x06
)
// NewCtxWithVersion creates an SSL context that is specific to the provided
// SSL version. See http://www.openssl.org/docs/ssl/SSL_CTX_new.html for more.
func NewCtxWithVersion(version SSLVersion) (*Ctx, error) {
var method *C.SSL_METHOD
switch version {
case SSLv3:
method = C.X_SSLv3_method()
case TLSv1:
method = C.X_TLSv1_method()
case TLSv1_1:
method = C.X_TLSv1_1_method()
case TLSv1_2:
method = C.X_TLSv1_2_method()
case AnyVersion:
method = C.X_SSLv23_method()
}
if method == nil {
return nil, errors.New("unknown ssl/tls version")
}
return newCtx(method)
}
// NewCtx creates a context that supports any TLS version 1.0 and newer.
func NewCtx() (*Ctx, error) {
c, err := NewCtxWithVersion(AnyVersion)
if err == nil {
c.SetOptions(NoSSLv2 | NoSSLv3)
}
return c, err
}
// NewCtxFromFiles calls NewCtx, loads the provided files, and configures the
// context to use them.
func NewCtxFromFiles(cert_file string, key_file string) (*Ctx, error) {
ctx, err := NewCtx()
if err != nil {
return nil, err
}
cert_bytes, err := ioutil.ReadFile(cert_file)
if err != nil {
return nil, err
}
certs := SplitPEM(cert_bytes)
if len(certs) == 0 {
return nil, fmt.Errorf("No PEM certificate found in '%s'", cert_file)
}
first, certs := certs[0], certs[1:]
cert, err := LoadCertificateFromPEM(first)
if err != nil {
return nil, err
}
err = ctx.UseCertificate(cert)
if err != nil {
return nil, err
}
for _, pem := range certs {
cert, err := LoadCertificateFromPEM(pem)
if err != nil {
return nil, err
}
err = ctx.AddChainCertificate(cert)
if err != nil {
return nil, err
}
}
key_bytes, err := ioutil.ReadFile(key_file)
if err != nil {
return nil, err
}
key, err := LoadPrivateKeyFromPEM(key_bytes)
if err != nil {
return nil, err
}
err = ctx.UsePrivateKey(key)
if err != nil {
return nil, err
}
return ctx, nil
}
// EllipticCurve repesents the ASN.1 OID of an elliptic curve.
// see https://www.openssl.org/docs/apps/ecparam.html for a list of implemented curves.
type EllipticCurve int
const (
// P-256: X9.62/SECG curve over a 256 bit prime field
Prime256v1 EllipticCurve = C.NID_X9_62_prime256v1
// P-384: NIST/SECG curve over a 384 bit prime field
Secp384r1 EllipticCurve = C.NID_secp384r1
// P-521: NIST/SECG curve over a 521 bit prime field
Secp521r1 EllipticCurve = C.NID_secp521r1
)
// SetEllipticCurve sets the elliptic curve used by the SSL context to
// enable an ECDH cipher suite to be selected during the handshake.
func (c *Ctx) SetEllipticCurve(curve EllipticCurve) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
k := C.EC_KEY_new_by_curve_name(C.int(curve))
if k == nil {
return errors.New("Unknown curve")
}
defer C.EC_KEY_free(k)
if int(C.X_SSL_CTX_set_tmp_ecdh(c.ctx, k)) != 1 {
return errorFromErrorQueue()
}
return nil
}
// UseCertificate configures the context to present the given certificate to
// peers.
func (c *Ctx) UseCertificate(cert *Certificate) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
c.cert = cert
if int(C.SSL_CTX_use_certificate(c.ctx, cert.x)) != 1 {
return errorFromErrorQueue()
}
return nil
}
// AddChainCertificate adds a certificate to the chain presented in the
// handshake.
func (c *Ctx) AddChainCertificate(cert *Certificate) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
c.chain = append(c.chain, cert)
if int(C.X_SSL_CTX_add_extra_chain_cert(c.ctx, cert.x)) != 1 {
return errorFromErrorQueue()
}
// OpenSSL takes ownership via SSL_CTX_add_extra_chain_cert
runtime.SetFinalizer(cert, nil)
return nil
}
// UsePrivateKey configures the context to use the given private key for SSL
// handshakes.
func (c *Ctx) UsePrivateKey(key PrivateKey) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
c.key = key
if int(C.SSL_CTX_use_PrivateKey(c.ctx, key.evpPKey())) != 1 {
return errorFromErrorQueue()
}
return nil
}
type CertificateStore struct {
store *C.X509_STORE
// for GC
ctx *Ctx
certs []*Certificate
}
// Allocate a new, empty CertificateStore
func NewCertificateStore() (*CertificateStore, error) {
s := C.X509_STORE_new()
if s == nil {
return nil, errors.New("failed to allocate X509_STORE")
}
store := &CertificateStore{store: s}
runtime.SetFinalizer(store, func(s *CertificateStore) {
C.X509_STORE_free(s.store)
})
return store, nil
}
// Parse a chained PEM file, loading all certificates into the Store.
func (s *CertificateStore) LoadCertificatesFromPEM(data []byte) error {
pems := SplitPEM(data)
for _, pem := range pems {
cert, err := LoadCertificateFromPEM(pem)
if err != nil {
return err
}
err = s.AddCertificate(cert)
if err != nil {
return err
}
}
return nil
}
// GetCertificateStore returns the context's certificate store that will be
// used for peer validation.
func (c *Ctx) GetCertificateStore() *CertificateStore {
// we don't need to dealloc the cert store pointer here, because it points
// to a ctx internal. so we do need to keep the ctx around
return &CertificateStore{
store: C.SSL_CTX_get_cert_store(c.ctx),
ctx: c}
}
// AddCertificate marks the provided Certificate as a trusted certificate in
// the given CertificateStore.
func (s *CertificateStore) AddCertificate(cert *Certificate) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
s.certs = append(s.certs, cert)
if int(C.X509_STORE_add_cert(s.store, cert.x)) != 1 {
return errorFromErrorQueue()
}
return nil
}
type CertificateStoreCtx struct {
ctx *C.X509_STORE_CTX
ssl_ctx *Ctx
}
func (self *CertificateStoreCtx) VerifyResult() VerifyResult {
return VerifyResult(C.X509_STORE_CTX_get_error(self.ctx))
}
func (self *CertificateStoreCtx) Err() error {
code := C.X509_STORE_CTX_get_error(self.ctx)
if code == C.X509_V_OK {
return nil
}
return fmt.Errorf("openssl: %s",
C.GoString(C.X509_verify_cert_error_string(C.long(code))))
}
func (self *CertificateStoreCtx) Depth() int {
return int(C.X509_STORE_CTX_get_error_depth(self.ctx))
}
// the certicate returned is only valid for the lifetime of the underlying
// X509_STORE_CTX
func (self *CertificateStoreCtx) GetCurrentCert() *Certificate {
x509 := C.X509_STORE_CTX_get_current_cert(self.ctx)
if x509 == nil {
return nil
}
// add a ref
if 1 != C.X_X509_add_ref(x509) {
return nil
}
cert := &Certificate{
x: x509,
}
runtime.SetFinalizer(cert, func(cert *Certificate) {
C.X509_free(cert.x)
})
return cert
}
// LoadVerifyLocations tells the context to trust all certificate authorities
// provided in either the ca_file or the ca_path.
// See http://www.openssl.org/docs/ssl/SSL_CTX_load_verify_locations.html for
// more.
func (c *Ctx) LoadVerifyLocations(ca_file string, ca_path string) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var c_ca_file, c_ca_path *C.char
if ca_file != "" {
c_ca_file = C.CString(ca_file)
defer C.free(unsafe.Pointer(c_ca_file))
}
if ca_path != "" {
c_ca_path = C.CString(ca_path)
defer C.free(unsafe.Pointer(c_ca_path))
}
if C.SSL_CTX_load_verify_locations(c.ctx, c_ca_file, c_ca_path) != 1 {
return errorFromErrorQueue()
}
return nil
}
type Options int
const (
// NoCompression is only valid if you are using OpenSSL 1.0.1 or newer
NoCompression Options = C.SSL_OP_NO_COMPRESSION
NoSSLv2 Options = C.SSL_OP_NO_SSLv2
NoSSLv3 Options = C.SSL_OP_NO_SSLv3
NoTLSv1 Options = C.SSL_OP_NO_TLSv1
CipherServerPreference Options = C.SSL_OP_CIPHER_SERVER_PREFERENCE
NoSessionResumptionOrRenegotiation Options = C.SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
NoTicket Options = C.SSL_OP_NO_TICKET
)
// SetOptions sets context options. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
func (c *Ctx) SetOptions(options Options) Options {
return Options(C.X_SSL_CTX_set_options(
c.ctx, C.long(options)))
}
func (c *Ctx) ClearOptions(options Options) Options {
return Options(C.X_SSL_CTX_clear_options(
c.ctx, C.long(options)))
}
// GetOptions returns context options. See
// https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
func (c *Ctx) GetOptions() Options {
return Options(C.X_SSL_CTX_get_options(c.ctx))
}
type Modes int
const (
// ReleaseBuffers is only valid if you are using OpenSSL 1.0.1 or newer
ReleaseBuffers Modes = C.SSL_MODE_RELEASE_BUFFERS
)
// SetMode sets context modes. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_mode.html
func (c *Ctx) SetMode(modes Modes) Modes {
return Modes(C.X_SSL_CTX_set_mode(c.ctx, C.long(modes)))
}
// GetMode returns context modes. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_mode.html
func (c *Ctx) GetMode() Modes {
return Modes(C.X_SSL_CTX_get_mode(c.ctx))
}
type VerifyOptions int
const (
VerifyNone VerifyOptions = C.SSL_VERIFY_NONE
VerifyPeer VerifyOptions = C.SSL_VERIFY_PEER
VerifyFailIfNoPeerCert VerifyOptions = C.SSL_VERIFY_FAIL_IF_NO_PEER_CERT
VerifyClientOnce VerifyOptions = C.SSL_VERIFY_CLIENT_ONCE
)
type VerifyCallback func(ok bool, store *CertificateStoreCtx) bool
//export go_ssl_ctx_verify_cb_thunk
func go_ssl_ctx_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 := (*Ctx)(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
}
// SetVerify controls peer verification settings. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
func (c *Ctx) SetVerify(options VerifyOptions, verify_cb VerifyCallback) {
c.verify_cb = verify_cb
if verify_cb != nil {
C.SSL_CTX_set_verify(c.ctx, C.int(options), (*[0]byte)(C.X_SSL_CTX_verify_cb))
} else {
C.SSL_CTX_set_verify(c.ctx, C.int(options), nil)
}
}
func (c *Ctx) SetVerifyMode(options VerifyOptions) {
c.SetVerify(options, c.verify_cb)
}
func (c *Ctx) SetVerifyCallback(verify_cb VerifyCallback) {
c.SetVerify(c.VerifyMode(), verify_cb)
}
func (c *Ctx) GetVerifyCallback() VerifyCallback {
return c.verify_cb
}
func (c *Ctx) VerifyMode() VerifyOptions {
return VerifyOptions(C.SSL_CTX_get_verify_mode(c.ctx))
}
// 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 (c *Ctx) SetVerifyDepth(depth int) {
C.SSL_CTX_set_verify_depth(c.ctx, 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 (c *Ctx) GetVerifyDepth() int {
return int(C.SSL_CTX_get_verify_depth(c.ctx))
}
type TLSExtServernameCallback func(ssl *SSL) SSLTLSExtErr
// SetTLSExtServernameCallback sets callback function 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 (c *Ctx) SetTLSExtServernameCallback(sni_cb TLSExtServernameCallback) {
c.sni_cb = sni_cb
C.X_SSL_CTX_set_tlsext_servername_callback(c.ctx, (*[0]byte)(C.sni_cb))
}
func (c *Ctx) SetSessionId(session_id []byte) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var ptr *C.uchar
if len(session_id) > 0 {
ptr = (*C.uchar)(unsafe.Pointer(&session_id[0]))
}
if int(C.SSL_CTX_set_session_id_context(c.ctx, ptr,
C.uint(len(session_id)))) == 0 {
return errorFromErrorQueue()
}
return nil
}
// SetCipherList sets the list of available ciphers. The format of the list is
// described at http://www.openssl.org/docs/apps/ciphers.html, but see
// http://www.openssl.org/docs/ssl/SSL_CTX_set_cipher_list.html for more.
func (c *Ctx) SetCipherList(list string) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
clist := C.CString(list)
defer C.free(unsafe.Pointer(clist))
if int(C.SSL_CTX_set_cipher_list(c.ctx, clist)) == 0 {
return errorFromErrorQueue()
}
return nil
}
type SessionCacheModes int
const (
SessionCacheOff SessionCacheModes = C.SSL_SESS_CACHE_OFF
SessionCacheClient SessionCacheModes = C.SSL_SESS_CACHE_CLIENT
SessionCacheServer SessionCacheModes = C.SSL_SESS_CACHE_SERVER
SessionCacheBoth SessionCacheModes = C.SSL_SESS_CACHE_BOTH
NoAutoClear SessionCacheModes = C.SSL_SESS_CACHE_NO_AUTO_CLEAR
NoInternalLookup SessionCacheModes = C.SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
NoInternalStore SessionCacheModes = C.SSL_SESS_CACHE_NO_INTERNAL_STORE
NoInternal SessionCacheModes = C.SSL_SESS_CACHE_NO_INTERNAL
)
// SetSessionCacheMode enables or disables session caching. See
// http://www.openssl.org/docs/ssl/SSL_CTX_set_session_cache_mode.html
func (c *Ctx) SetSessionCacheMode(modes SessionCacheModes) SessionCacheModes {
return SessionCacheModes(
C.X_SSL_CTX_set_session_cache_mode(c.ctx, C.long(modes)))
}
// Set session cache timeout. Returns previously set value.
// See https://www.openssl.org/docs/ssl/SSL_CTX_set_timeout.html
func (c *Ctx) SetTimeout(t time.Duration) time.Duration {
prev := C.X_SSL_CTX_set_timeout(c.ctx, C.long(t/time.Second))
return time.Duration(prev) * time.Second
}
// Get session cache timeout.
// See https://www.openssl.org/docs/ssl/SSL_CTX_set_timeout.html
func (c *Ctx) GetTimeout() time.Duration {
return time.Duration(C.X_SSL_CTX_get_timeout(c.ctx)) * time.Second
}
// Set session cache size. Returns previously set value.
// https://www.openssl.org/docs/ssl/SSL_CTX_sess_set_cache_size.html
func (c *Ctx) SessSetCacheSize(t int) int {
return int(C.X_SSL_CTX_sess_set_cache_size(c.ctx, C.long(t)))
}
// Get session cache size.
// https://www.openssl.org/docs/ssl/SSL_CTX_sess_set_cache_size.html
func (c *Ctx) SessGetCacheSize() int {
return int(C.X_SSL_CTX_sess_get_cache_size(c.ctx))
}