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enable TLS client forwarding

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Copys the incoming TLS client certificate to the outgoing
request. The backend can then use this certificate for
client authentication ie. k8s client cert authentication
This commit is contained in:
Drew Wells 2017-04-06 17:10:02 -05:00 committed by Ludovic Fernandez
parent 7399a83c74
commit 3048509807
4 changed files with 99 additions and 38 deletions
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63
docs/basics.md
View file

@ -94,7 +94,7 @@ Separate multiple rule values by `,` (comma) in order to enable ANY semantics (i
Separate multiple rule values by `;` (semicolon) in order to enable ALL semantics (i.e., forward a request if all rules match).
You can optionally enable `passHostHeader` to forward client `Host` header to the backend.
You can optionally enable `passHostHeader` to forward client `Host` header to the backend. You can also optionally enable `passTLSCert` to forward TLS Client certificates to the backend.
Following is the list of existing matcher rules along with examples:
@ -140,6 +140,7 @@ Here is an example of frontends definition:
[frontends.frontend2]
backend = "backend1"
passHostHeader = true
passTLSCert = true
priority = 10
entrypoints = ["https"] # overrides defaultEntryPoints
[frontends.frontend2.routes.test_1]
@ -161,34 +162,34 @@ As seen in the previous example, you can combine multiple rules.
In TOML file, you can use multiple routes:
```toml
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Host:test3.localhost"
[frontends.frontend3.routes.test_2]
rule = "Path:/test"
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Host:test3.localhost"
[frontends.frontend3.routes.test_2]
rule = "Path:/test"
```
Here `frontend3` will forward the traffic to the `backend2` if the rules `Host:test3.localhost` **AND** `Path:/test` are matched.
You can also use the notation using a `;` separator, same result:
```toml
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Host:test3.localhost;Path:/test"
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Host:test3.localhost;Path:/test"
```
Finally, you can create a rule to bind multiple domains or Path to a frontend, using the `,` separator:
```toml
[frontends.frontend2]
[frontends.frontend2.routes.test_1]
rule = "Host:test1.localhost,test2.localhost"
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Path:/test1,/test2"
[frontends.frontend2]
[frontends.frontend2.routes.test_1]
rule = "Host:test1.localhost,test2.localhost"
[frontends.frontend3]
backend = "backend2"
[frontends.frontend3.routes.test_1]
rule = "Path:/test1,/test2"
```
### Rules Order
@ -218,19 +219,19 @@ By default, routes will be sorted (in descending order) using rules length (to a
You can customize priority by frontend:
```toml
[frontends]
[frontends.frontend1]
backend = "backend1"
priority = 10
passHostHeader = true
[frontends.frontend1.routes.test_1]
rule = "PathPrefix:/to"
[frontends.frontend2]
priority = 5
backend = "backend2"
passHostHeader = true
[frontends.frontend2.routes.test_1]
rule = "PathPrefix:/toto"
[frontends]
[frontends.frontend1]
backend = "backend1"
priority = 10
passHostHeader = true
[frontends.frontend1.routes.test_1]
rule = "PathPrefix:/to"
[frontends.frontend2]
priority = 5
backend = "backend2"
passHostHeader = true
[frontends.frontend2.routes.test_1]
rule = "PathPrefix:/toto"
```
Here, `frontend1` will be matched before `frontend2` (`10 > 5`).

1
docs/user-guide/examples.md
View file

@ -89,6 +89,7 @@ entryPoint = "https"
[frontends.frontend2]
backend = "backend1"
passHostHeader = true
passTLSCert = true
entrypoints = ["https"] # overrides defaultEntryPoints
[frontends.frontend2.routes.test_1]
rule = "Host:{subdomain:[a-z]+}.localhost"

72
server/server.go
View file

@ -418,6 +418,33 @@ func (server *Server) listenSignals() {
server.Stop()
}
func createClientTLSConfig(tlsOption *TLS) (*tls.Config, error) {
if tlsOption == nil {
return nil, errors.New("no TLS provided")
}
config, err := tlsOption.Certificates.CreateTLSConfig()
if err != nil {
return nil, err
}
if len(tlsOption.ClientCAFiles) > 0 {
pool := x509.NewCertPool()
for _, caFile := range tlsOption.ClientCAFiles {
data, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, err
}
if !pool.AppendCertsFromPEM(data) {
return nil, errors.New("invalid certificate(s) in " + caFile)
}
}
config.RootCAs = pool
}
config.BuildNameToCertificate()
return config, nil
}
// creates a TLS config that allows terminating HTTPS for multiple domains using SNI
func (server *Server) createTLSConfig(entryPointName string, tlsOption *TLS, router *middlewares.HandlerSwitcher) (*tls.Config, error) {
if tlsOption == nil {
@ -500,6 +527,7 @@ func (server *Server) createTLSConfig(entryPointName string, tlsOption *TLS, rou
}
}
}
return config, nil
}
@ -549,6 +577,17 @@ func (server *Server) buildEntryPoints(globalConfiguration GlobalConfiguration)
return serverEntryPoints
}
// clientTLSRoundTripper is used for forwarding client authentication to
// backend server
func clientTLSRoundTripper(config *tls.Config) http.RoundTripper {
if config == nil {
return http.DefaultTransport
}
return &http.Transport{
TLSClientConfig: config,
}
}
// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic
// provider configurations.
func (server *Server) loadConfig(configurations configs, globalConfiguration GlobalConfiguration) (map[string]*serverEntryPoint, error) {
@ -565,12 +604,6 @@ func (server *Server) loadConfig(configurations configs, globalConfiguration Glo
log.Debugf("Creating frontend %s", frontendName)
fwd, err := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader))
if err != nil {
log.Errorf("Error creating forwarder for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
if len(frontend.EntryPoints) == 0 {
log.Errorf("No entrypoint defined for frontend %s, defaultEntryPoints:%s", frontendName, globalConfiguration.DefaultEntryPoints)
log.Errorf("Skipping frontend %s...", frontendName)
@ -618,6 +651,31 @@ func (server *Server) loadConfig(configurations configs, globalConfiguration Glo
}
if backends[entryPointName+frontend.Backend] == nil {
log.Debugf("Creating backend %s", frontend.Backend)
var (
tlsConfig *tls.Config
err error
lb http.Handler
)
if frontend.PassTLSCert {
tlsConfig, err = createClientTLSConfig(entryPoint.TLS)
if err != nil {
log.Errorf("Failed to create TLS config for frontend %s: %v", frontendName, err)
continue frontend
}
}
// passing nil will use the roundtripper http.DefaultTransport
rt := clientTLSRoundTripper(tlsConfig)
fwd, err := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader), forward.RoundTripper(rt))
if err != nil {
log.Errorf("Error creating forwarder for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
var rr *roundrobin.RoundRobin
var saveFrontend http.Handler
if server.accessLoggerMiddleware != nil {
@ -627,6 +685,7 @@ func (server *Server) loadConfig(configurations configs, globalConfiguration Glo
} else {
rr, _ = roundrobin.New(fwd)
}
if configuration.Backends[frontend.Backend] == nil {
log.Errorf("Undefined backend '%s' for frontend %s", frontend.Backend, frontendName)
log.Errorf("Skipping frontend %s...", frontendName)
@ -648,7 +707,6 @@ func (server *Server) loadConfig(configurations configs, globalConfiguration Glo
sticky = roundrobin.NewStickySession(cookiename)
}
var lb http.Handler
switch lbMethod {
case types.Drr:
log.Debugf("Creating load-balancer drr")

1
types/types.go
View file

@ -60,6 +60,7 @@ type Frontend struct {
Backend string `json:"backend,omitempty"`
Routes map[string]Route `json:"routes,omitempty"`
PassHostHeader bool `json:"passHostHeader,omitempty"`
PassTLSCert bool `json:"passTLSCert,omitempty"`
Priority int `json:"priority"`
BasicAuth []string `json:"basicAuth"`
WhitelistSourceRange []string `json:"whitelistSourceRange,omitempty"`