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Perfect TrustedProxies feature

This commit is contained in:
Notealot 2021-09-29 22:56:28 +08:00
parent 6d75aba83f
commit 4d41a2f010
6 changed files with 80 additions and 72 deletions
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12
README.md
View File

@ -2202,11 +2202,17 @@ Gin lets you specify which headers to hold the real client IP (if any),
as well as specifying which proxies (or direct clients) you trust to
specify one of these headers.
The `TrustedProxies` slice on your `gin.Engine` specifes network addresses or
network CIDRs from where clients which their request headers related to client
Use function `SetTrustedProxies()` on your `gin.Engine` to specifies network addresses
or network CIDRs from where clients which their request headers related to client
IP can be trusted. They can be IPv4 addresses, IPv4 CIDRs, IPv6 addresses or
IPv6 CIDRs.
**Attention:** Gin trust all proxies by default if you don't specify a trusted
proxy using this function, **this is not safe**. At the same time, if you don't use
any proxy, you can disable this feature by use `Engine.SetTrustedProxies(nil)`,
then `Context.ClientIP()` will return the remote address directly to avoid some
unnecessary computation.
```go
import (
"fmt"
@ -2217,7 +2223,7 @@ import (
func main() {
router := gin.Default()
router.TrustedProxies = []string{"192.168.1.2"}
router.SetTrustedProxies([]string{"192.168.1.2"})
router.GET("/", func(c *gin.Context) {
// If the client is 192.168.1.2, use the X-Forwarded-For

2
context.go
View File

@ -778,7 +778,7 @@ func (c *Context) ClientIP() string {
// RemoteIP parses the IP from Request.RemoteAddr, normalizes and returns the IP (without the port).
// It also checks if the remoteIP is a trusted proxy or not.
// In order to perform this validation, it will see if the IP is contained within at least one of the CIDR blocks
// defined in Engine.TrustedProxies
// defined by Engine.SetTrustedProxies()
func (c *Context) RemoteIP() (net.IP, bool) {
ip, _, err := net.SplitHostPort(strings.TrimSpace(c.Request.RemoteAddr))
if err != nil {

4
context_test.go
View File

@ -1409,6 +1409,10 @@ func TestContextClientIP(t *testing.T) {
c.engine.RemoteIPHeaders = []string{"X-Forwarded-For"}
assert.Equal(t, "40.40.40.40", c.ClientIP())
// Disabled TrustedProxies feature
_ = c.engine.SetTrustedProxies(nil)
assert.Equal(t, "40.40.40.40", c.ClientIP())
// Last proxy is trusted, but the RemoteAddr is not
_ = c.engine.SetTrustedProxies([]string{"30.30.30.30"})
assert.Equal(t, "40.40.40.40", c.ClientIP())

70
gin.go
View File

@ -11,6 +11,7 @@ import (
"net/http"
"os"
"path"
"reflect"
"strings"
"sync"
@ -27,6 +28,8 @@ var (
var defaultPlatform string
var defaultTrustedCIDRs = []*net.IPNet{{IP: net.IP{0x0, 0x0, 0x0, 0x0}, Mask: net.IPMask{0x0, 0x0, 0x0, 0x0}}} // 0.0.0.0/0
// HandlerFunc defines the handler used by gin middleware as return value.
type HandlerFunc func(*Context)
@ -119,15 +122,9 @@ type Engine struct {
// List of headers used to obtain the client IP when
// `(*gin.Engine).ForwardedByClientIP` is `true` and
// `(*gin.Context).Request.RemoteAddr` is matched by at least one of the
// network origins of `(*gin.Engine).TrustedProxies`.
// network origins of list set by `(*gin.Engine).SetTrustedProxies()`.
RemoteIPHeaders []string
// List of network origins (IPv4 addresses, IPv4 CIDRs, IPv6 addresses or
// IPv6 CIDRs) from which to trust request's headers that contain
// alternative client IP when `(*gin.Engine).ForwardedByClientIP` is
// `true`.
TrustedProxies []string
// If set to a constant of value gin.Platform*, trusts the headers set by
// that platform, for example to determine the client IP
TrustedPlatform string
@ -147,6 +144,7 @@ type Engine struct {
pool sync.Pool
trees methodTrees
maxParams uint16
trustedProxies []string
trustedCIDRs []*net.IPNet
}
@ -174,7 +172,6 @@ func New() *Engine {
HandleMethodNotAllowed: false,
ForwardedByClientIP: true,
RemoteIPHeaders: []string{"X-Forwarded-For", "X-Real-IP"},
TrustedProxies: []string{"0.0.0.0/0"},
TrustedPlatform: defaultPlatform,
UseRawPath: false,
RemoveExtraSlash: false,
@ -183,7 +180,8 @@ func New() *Engine {
trees: make(methodTrees, 0, 9),
delims: render.Delims{Left: "{{", Right: "}}"},
secureJSONPrefix: "while(1);",
trustedCIDRs: []*net.IPNet{{IP: net.IP{0x0, 0x0, 0x0, 0x0}, Mask: net.IPMask{0x0, 0x0, 0x0, 0x0}}},
trustedProxies: []string{"0.0.0.0/0"},
trustedCIDRs: defaultTrustedCIDRs,
}
engine.RouterGroup.engine = engine
engine.pool.New = func() interface{} {
@ -342,9 +340,9 @@ func iterate(path, method string, routes RoutesInfo, root *node) RoutesInfo {
func (engine *Engine) Run(addr ...string) (err error) {
defer func() { debugPrintError(err) }()
err = engine.parseTrustedProxies()
if err != nil {
return err
if engine.isUnsafeTrustedProxies() {
debugPrint("[WARNING] You trusted all proxies, this is not safe. We recommend you to set a value.\n" +
"Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.")
}
address := resolveAddress(addr)
@ -354,12 +352,12 @@ func (engine *Engine) Run(addr ...string) (err error) {
}
func (engine *Engine) prepareTrustedCIDRs() ([]*net.IPNet, error) {
if engine.TrustedProxies == nil {
if engine.trustedProxies == nil {
return nil, nil
}
cidr := make([]*net.IPNet, 0, len(engine.TrustedProxies))
for _, trustedProxy := range engine.TrustedProxies {
cidr := make([]*net.IPNet, 0, len(engine.trustedProxies))
for _, trustedProxy := range engine.trustedProxies {
if !strings.Contains(trustedProxy, "/") {
ip := parseIP(trustedProxy)
if ip == nil {
@ -382,13 +380,25 @@ func (engine *Engine) prepareTrustedCIDRs() ([]*net.IPNet, error) {
return cidr, nil
}
// SetTrustedProxies set Engine.TrustedProxies
// SetTrustedProxies set a list of network origins (IPv4 addresses,
// IPv4 CIDRs, IPv6 addresses or IPv6 CIDRs) from which to trust
// request's headers that contain alternative client IP when
// `(*gin.Engine).ForwardedByClientIP` is `true`. `TrustedProxies`
// feature is enabled by default, and it also trusts all proxies
// by default. If you want to disable this feature, use
// Engine.SetTrustedProxies(nil), then Context.ClientIP() will
// return the remote address directly.
func (engine *Engine) SetTrustedProxies(trustedProxies []string) error {
engine.TrustedProxies = trustedProxies
engine.trustedProxies = trustedProxies
return engine.parseTrustedProxies()
}
// parseTrustedProxies parse Engine.TrustedProxies to Engine.trustedCIDRs
// isUnsafeTrustedProxies equals Engine.trustedCIDRs and defaultTrustedCIDRs, it's not safe if true
func (engine *Engine) isUnsafeTrustedProxies() bool {
return reflect.DeepEqual(engine.trustedCIDRs, defaultTrustedCIDRs)
}
// parseTrustedProxies parse Engine.trustedProxies to Engine.trustedCIDRs
func (engine *Engine) parseTrustedProxies() error {
trustedCIDRs, err := engine.prepareTrustedCIDRs()
engine.trustedCIDRs = trustedCIDRs
@ -416,9 +426,9 @@ func (engine *Engine) RunTLS(addr, certFile, keyFile string) (err error) {
debugPrint("Listening and serving HTTPS on %s\n", addr)
defer func() { debugPrintError(err) }()
err = engine.parseTrustedProxies()
if err != nil {
return err
if engine.isUnsafeTrustedProxies() {
debugPrint("[WARNING] You trusted all proxies, this is not safe. We recommend you to set a value.\n" +
"Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.")
}
err = http.ListenAndServeTLS(addr, certFile, keyFile, engine)
@ -432,9 +442,9 @@ func (engine *Engine) RunUnix(file string) (err error) {
debugPrint("Listening and serving HTTP on unix:/%s", file)
defer func() { debugPrintError(err) }()
err = engine.parseTrustedProxies()
if err != nil {
return err
if engine.isUnsafeTrustedProxies() {
debugPrint("[WARNING] You trusted all proxies, this is not safe. We recommend you to set a value.\n" +
"Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.")
}
listener, err := net.Listen("unix", file)
@ -455,9 +465,9 @@ func (engine *Engine) RunFd(fd int) (err error) {
debugPrint("Listening and serving HTTP on fd@%d", fd)
defer func() { debugPrintError(err) }()
err = engine.parseTrustedProxies()
if err != nil {
return err
if engine.isUnsafeTrustedProxies() {
debugPrint("[WARNING] You trusted all proxies, this is not safe. We recommend you to set a value.\n" +
"Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.")
}
f := os.NewFile(uintptr(fd), fmt.Sprintf("fd@%d", fd))
@ -476,9 +486,9 @@ func (engine *Engine) RunListener(listener net.Listener) (err error) {
debugPrint("Listening and serving HTTP on listener what's bind with address@%s", listener.Addr())
defer func() { debugPrintError(err) }()
err = engine.parseTrustedProxies()
if err != nil {
return err
if engine.isUnsafeTrustedProxies() {
debugPrint("[WARNING] You trusted all proxies, this is not safe. We recommend you to set a value.\n" +
"Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.")
}
err = http.Serve(listener, engine)

7
gin_integration_test.go
View File

@ -76,6 +76,12 @@ func TestRunEmpty(t *testing.T) {
testRequest(t, "http://localhost:8080/example")
}
func TestBadTrustedCIDRs(t *testing.T) {
router := New()
assert.Error(t, router.SetTrustedProxies([]string{"hello/world"}))
}
/* legacy tests
func TestBadTrustedCIDRsForRun(t *testing.T) {
os.Setenv("PORT", "")
router := New()
@ -143,6 +149,7 @@ func TestBadTrustedCIDRsForRunTLS(t *testing.T) {
router.TrustedProxies = []string{"hello/world"}
assert.Error(t, router.RunTLS(":8080", "./testdata/certificate/cert.pem", "./testdata/certificate/key.pem"))
}
*/
func TestRunTLS(t *testing.T) {
router := New()

57
gin_test.go
View File

@ -539,19 +539,15 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
// valid ipv4 cidr
{
expectedTrustedCIDRs := []*net.IPNet{parseCIDR("0.0.0.0/0")}
r.TrustedProxies = []string{"0.0.0.0/0"}
trustedCIDRs, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"0.0.0.0/0"})
assert.NoError(t, err)
assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
assert.Equal(t, expectedTrustedCIDRs, r.trustedCIDRs)
}
// invalid ipv4 cidr
{
r.TrustedProxies = []string{"192.168.1.33/33"}
_, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"192.168.1.33/33"})
assert.Error(t, err)
}
@ -559,19 +555,16 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
// valid ipv4 address
{
expectedTrustedCIDRs := []*net.IPNet{parseCIDR("192.168.1.33/32")}
r.TrustedProxies = []string{"192.168.1.33"}
trustedCIDRs, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"192.168.1.33"})
assert.NoError(t, err)
assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
assert.Equal(t, expectedTrustedCIDRs, r.trustedCIDRs)
}
// invalid ipv4 address
{
r.TrustedProxies = []string{"192.168.1.256"}
_, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"192.168.1.256"})
assert.Error(t, err)
}
@ -579,19 +572,15 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
// valid ipv6 address
{
expectedTrustedCIDRs := []*net.IPNet{parseCIDR("2002:0000:0000:1234:abcd:ffff:c0a8:0101/128")}
r.TrustedProxies = []string{"2002:0000:0000:1234:abcd:ffff:c0a8:0101"}
trustedCIDRs, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"2002:0000:0000:1234:abcd:ffff:c0a8:0101"})
assert.NoError(t, err)
assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
assert.Equal(t, expectedTrustedCIDRs, r.trustedCIDRs)
}
// invalid ipv6 address
{
r.TrustedProxies = []string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101"}
_, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101"})
assert.Error(t, err)
}
@ -599,19 +588,15 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
// valid ipv6 cidr
{
expectedTrustedCIDRs := []*net.IPNet{parseCIDR("::/0")}
r.TrustedProxies = []string{"::/0"}
trustedCIDRs, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"::/0"})
assert.NoError(t, err)
assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
assert.Equal(t, expectedTrustedCIDRs, r.trustedCIDRs)
}
// invalid ipv6 cidr
{
r.TrustedProxies = []string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101/129"}
_, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies([]string{"gggg:0000:0000:1234:abcd:ffff:c0a8:0101/129"})
assert.Error(t, err)
}
@ -623,36 +608,32 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
parseCIDR("192.168.0.0/16"),
parseCIDR("172.16.0.1/32"),
}
r.TrustedProxies = []string{
err := r.SetTrustedProxies([]string{
"::/0",
"192.168.0.0/16",
"172.16.0.1",
}
trustedCIDRs, err := r.prepareTrustedCIDRs()
})
assert.NoError(t, err)
assert.Equal(t, expectedTrustedCIDRs, trustedCIDRs)
assert.Equal(t, expectedTrustedCIDRs, r.trustedCIDRs)
}
// invalid combination
{
r.TrustedProxies = []string{
err := r.SetTrustedProxies([]string{
"::/0",
"192.168.0.0/16",
"172.16.0.256",
}
_, err := r.prepareTrustedCIDRs()
})
assert.Error(t, err)
}
// nil value
{
r.TrustedProxies = nil
trustedCIDRs, err := r.prepareTrustedCIDRs()
err := r.SetTrustedProxies(nil)
assert.Nil(t, trustedCIDRs)
assert.Nil(t, r.trustedCIDRs)
assert.Nil(t, err)
}