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tls_multi_cert.go
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tls_multi_cert.go
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// Copyright (c) 2019 The BFE 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.
// an implementation of tls.MultiCertificate
package bfe_server
import (
"fmt"
"strings"
"sync"
)
import (
"github.com/bfenetworks/bfe/bfe_config/bfe_tls_conf/server_cert_conf"
"github.com/bfenetworks/bfe/bfe_config/bfe_tls_conf/tls_rule_conf"
"github.com/bfenetworks/bfe/bfe_tls"
)
type MultiCertMap struct {
vipCertMap map[string]*bfe_tls.Certificate // vip -> certificate
nameCertMap *NameCertMap // name -> certificate
defaultCert *bfe_tls.Certificate // default cert
lock sync.RWMutex
state *ProxyState // state for MultiCertMap
}
func NewMultiCertMap(state *ProxyState) *MultiCertMap {
m := new(MultiCertMap)
m.vipCertMap = make(map[string]*bfe_tls.Certificate)
m.nameCertMap = NewNameCertMap()
m.state = state
return m
}
// Get gets certificate for given connection.
func (m *MultiCertMap) Get(c *bfe_tls.Conn) *bfe_tls.Certificate {
var cert *bfe_tls.Certificate
m.state.TlsMultiCertGet.Inc(1)
m.lock.RLock()
defer m.lock.RUnlock()
// choose certificate by vip
vip := c.GetVip()
if vip != nil {
key := vip.String()
cert = m.vipCertMap[key]
if cert == nil {
m.state.TlsMultiCertConnVipUnknown.Inc(1)
}
} else {
m.state.TlsMultiCertConnWithoutVip.Inc(1)
}
// if vip for connection is not found unexpectedly, or vip for connection is unknown,
// try to choose cert by SNI (Server Name Indication)
if cert == nil {
serverName := c.GetServerName()
if len(serverName) > 0 {
cert = m.nameCertMap.Get(serverName)
} else {
m.state.TlsMultiCertConnWithoutSni.Inc(1)
}
}
// choose default cert
if cert == nil {
cert = m.defaultCert
m.state.TlsMultiCertUseDefault.Inc(1)
}
return cert
}
func (m *MultiCertMap) GetDefault() *bfe_tls.Certificate {
m.lock.RLock()
defer m.lock.RUnlock()
if m.defaultCert == nil {
return nil
}
return m.defaultCert
}
// Update updates all certificates.
func (m *MultiCertMap) Update(certConf map[string]*bfe_tls.Certificate,
ruleMap tls_rule_conf.TlsRuleMap) error {
m.state.TlsMultiCertUpdate.Inc(1)
vipCertMap := make(map[string]*bfe_tls.Certificate)
for _, ruleConf := range ruleMap {
cert, ok := certConf[ruleConf.CertName]
if !ok {
m.state.TlsMultiCertUpdateErr.Inc(1)
return fmt.Errorf("certificate %s not exist", ruleConf.CertName)
}
for _, vip := range ruleConf.VipConf {
vipCertMap[vip] = cert
}
}
nameCertMap := NewNameCertMap()
nameCertMap.Update(certConf)
defaultCert := certConf[server_cert_conf.DefaultCert]
if defaultCert == nil {
m.state.TlsMultiCertUpdateErr.Inc(1)
return fmt.Errorf("default certificate not exist")
}
m.lock.Lock()
m.vipCertMap = vipCertMap
m.nameCertMap = nameCertMap
m.defaultCert = defaultCert
m.lock.Unlock()
return nil
}
type NameCertMap struct {
normalCertMap map[string]*bfe_tls.Certificate // cert map for normal name
wildcardCertMap map[string]*bfe_tls.Certificate // cert map for wildcard name
}
func NewNameCertMap() *NameCertMap {
m := new(NameCertMap)
m.normalCertMap = make(map[string]*bfe_tls.Certificate)
m.wildcardCertMap = make(map[string]*bfe_tls.Certificate)
return m
}
func (m *NameCertMap) Get(serverName string) *bfe_tls.Certificate {
serverName = strings.ToLower(serverName)
for len(serverName) > 0 && serverName[len(serverName)-1] == '.' {
serverName = serverName[:len(serverName)-1]
}
if cert, ok := m.normalCertMap[serverName]; ok {
return cert
}
// Note: Since number of wildcard names is too small,
// just perform sequent matching here
for name, cert := range m.wildcardCertMap {
if tls_rule_conf.MatchHostnames(name, serverName) {
return cert
}
}
return nil
}
func (m *NameCertMap) Update(certConf map[string]*bfe_tls.Certificate) {
normalCertMap := make(map[string]*bfe_tls.Certificate)
wildcardCertMap := make(map[string]*bfe_tls.Certificate)
for _, cert := range certConf {
names := server_cert_conf.GetNamesForCert(cert)
for _, name := range names {
if strings.Contains(name, "*") {
wildcardCertMap[name] = cert
} else {
normalCertMap[name] = cert
}
}
}
m.normalCertMap = normalCertMap
m.wildcardCertMap = wildcardCertMap
}