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Fix #2259 open redirect vulnerability in echo.StaticDirectoryHandler (used by e.Static, e.StaticFs etc)

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remove pre Go1.16 and after differences
This commit is contained in:
toimtoimtoim 2022-09-04 22:44:32 +03:00 committed by Martti T
parent d77e8c09b2
commit 0ac4d74402
13 changed files with 536 additions and 688 deletions
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265
binder_go1.15_test.go
View File

@ -1,265 +0,0 @@
// +build go1.15
package echo
/**
Since version 1.15 time.Time and time.Duration error message pattern has changed (values are wrapped now in \"\")
So pre 1.15 these tests fail with similar error:
expected: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param"
actual : "code=400, message=failed to bind field value to Duration, internal=time: invalid duration nope, field=param"
*/
import (
"errors"
"github.com/stretchr/testify/assert"
"io"
"net/http"
"net/http/httptest"
"testing"
"time"
)
func createTestContext15(URL string, body io.Reader, pathParams map[string]string) Context {
e := New()
req := httptest.NewRequest(http.MethodGet, URL, body)
if body != nil {
req.Header.Set(HeaderContentType, MIMEApplicationJSON)
}
rec := httptest.NewRecorder()
c := e.NewContext(req, rec)
if len(pathParams) > 0 {
names := make([]string, 0)
values := make([]string, 0)
for name, value := range pathParams {
names = append(names, name)
values = append(values, value)
}
c.SetParamNames(names...)
c.SetParamValues(values...)
}
return c
}
func TestValueBinder_TimeError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
whenLayout string
expectValue time.Time
expectError string
}{
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: time.Time{},
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\": extra text: \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: time.Time{},
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\": extra text: \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext15(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
if tc.givenFailFast {
b.errors = []error{errors.New("previous error")}
}
dest := time.Time{}
var err error
if tc.whenMust {
err = b.MustTime("param", &dest, tc.whenLayout).BindError()
} else {
err = b.Time("param", &dest, tc.whenLayout).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_TimesError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
whenLayout string
expectValue []time.Time
expectError string
}{
{
name: "nok, fail fast without binding value",
givenFailFast: true,
whenURL: "/search?param=1&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"1\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"1\" as \"2006\", field=param",
},
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"nope\" as \"2006\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"nope\" as \"2006\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext15(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
b.errors = tc.givenBindErrors
layout := time.RFC3339
if tc.whenLayout != "" {
layout = tc.whenLayout
}
var dest []time.Time
var err error
if tc.whenMust {
err = b.MustTimes("param", &dest, layout).BindError()
} else {
err = b.Times("param", &dest, layout).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_DurationError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
expectValue time.Duration
expectError string
}{
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: 0,
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: 0,
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext15(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
if tc.givenFailFast {
b.errors = []error{errors.New("previous error")}
}
var dest time.Duration
var err error
if tc.whenMust {
err = b.MustDuration("param", &dest).BindError()
} else {
err = b.Duration("param", &dest).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_DurationsError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
expectValue []time.Duration
expectError string
}{
{
name: "nok, fail fast without binding value",
givenFailFast: true,
whenURL: "/search?param=1&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: missing unit in duration \"1\", field=param",
},
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext15(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
b.errors = tc.givenBindErrors
var dest []time.Duration
var err error
if tc.whenMust {
err = b.MustDurations("param", &dest).BindError()
} else {
err = b.Durations("param", &dest).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}

222
binder_test.go
View File

@ -1,4 +1,3 @@
// run tests as external package to get real feel for API
package echo
import (
@ -3029,3 +3028,224 @@ func BenchmarkValueBinder_BindInt64_10_fields(b *testing.B) {
}
}
}
func TestValueBinder_TimeError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
whenLayout string
expectValue time.Time
expectError string
}{
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: time.Time{},
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\": extra text: \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: time.Time{},
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\": extra text: \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
if tc.givenFailFast {
b.errors = []error{errors.New("previous error")}
}
dest := time.Time{}
var err error
if tc.whenMust {
err = b.MustTime("param", &dest, tc.whenLayout).BindError()
} else {
err = b.Time("param", &dest, tc.whenLayout).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_TimesError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
whenLayout string
expectValue []time.Time
expectError string
}{
{
name: "nok, fail fast without binding value",
givenFailFast: true,
whenURL: "/search?param=1&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"1\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"1\" as \"2006\", field=param",
},
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"nope\" as \"2006\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: []time.Time(nil),
expectError: "code=400, message=failed to bind field value to Time, internal=parsing time \"nope\" as \"2006-01-02T15:04:05Z07:00\": cannot parse \"nope\" as \"2006\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
b.errors = tc.givenBindErrors
layout := time.RFC3339
if tc.whenLayout != "" {
layout = tc.whenLayout
}
var dest []time.Time
var err error
if tc.whenMust {
err = b.MustTimes("param", &dest, layout).BindError()
} else {
err = b.Times("param", &dest, layout).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_DurationError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
expectValue time.Duration
expectError string
}{
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: 0,
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: 0,
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
if tc.givenFailFast {
b.errors = []error{errors.New("previous error")}
}
var dest time.Duration
var err error
if tc.whenMust {
err = b.MustDuration("param", &dest).BindError()
} else {
err = b.Duration("param", &dest).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}
func TestValueBinder_DurationsError(t *testing.T) {
var testCases = []struct {
name string
givenFailFast bool
givenBindErrors []error
whenURL string
whenMust bool
expectValue []time.Duration
expectError string
}{
{
name: "nok, fail fast without binding value",
givenFailFast: true,
whenURL: "/search?param=1&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: missing unit in duration \"1\", field=param",
},
{
name: "nok, conversion fails, value is not changed",
whenURL: "/search?param=nope&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
{
name: "nok (must), conversion fails, value is not changed",
whenMust: true,
whenURL: "/search?param=nope&param=100",
expectValue: []time.Duration(nil),
expectError: "code=400, message=failed to bind field value to Duration, internal=time: invalid duration \"nope\", field=param",
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
c := createTestContext(tc.whenURL, nil, nil)
b := QueryParamsBinder(c).FailFast(tc.givenFailFast)
b.errors = tc.givenBindErrors
var dest []time.Duration
var err error
if tc.whenMust {
err = b.MustDurations("param", &dest).BindError()
} else {
err = b.Durations("param", &dest).BindError()
}
assert.Equal(t, tc.expectValue, dest)
if tc.expectError != "" {
assert.EqualError(t, err, tc.expectError)
} else {
assert.NoError(t, err)
}
})
}
}

42
context_fs.go
View File

@ -1,33 +1,49 @@
//go:build !go1.16
// +build !go1.16
package echo
import (
"errors"
"io"
"io/fs"
"net/http"
"os"
"path/filepath"
)
func (c *context) File(file string) (err error) {
f, err := os.Open(file)
func (c *context) File(file string) error {
return fsFile(c, file, c.echo.Filesystem)
}
// FileFS serves file from given file system.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (c *context) FileFS(file string, filesystem fs.FS) error {
return fsFile(c, file, filesystem)
}
func fsFile(c Context, file string, filesystem fs.FS) error {
f, err := filesystem.Open(file)
if err != nil {
return NotFoundHandler(c)
return ErrNotFound
}
defer f.Close()
fi, _ := f.Stat()
if fi.IsDir() {
file = filepath.Join(file, indexPage)
f, err = os.Open(file)
file = filepath.ToSlash(filepath.Join(file, indexPage)) // ToSlash is necessary for Windows. fs.Open and os.Open are different in that aspect.
f, err = filesystem.Open(file)
if err != nil {
return NotFoundHandler(c)
return ErrNotFound
}
defer f.Close()
if fi, err = f.Stat(); err != nil {
return
return err
}
}
http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), f)
return
ff, ok := f.(io.ReadSeeker)
if !ok {
return errors.New("file does not implement io.ReadSeeker")
}
http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), ff)
return nil
}

52
context_fs_go1.16.go
View File

@ -1,52 +0,0 @@
//go:build go1.16
// +build go1.16
package echo
import (
"errors"
"io"
"io/fs"
"net/http"
"path/filepath"
)
func (c *context) File(file string) error {
return fsFile(c, file, c.echo.Filesystem)
}
// FileFS serves file from given file system.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (c *context) FileFS(file string, filesystem fs.FS) error {
return fsFile(c, file, filesystem)
}
func fsFile(c Context, file string, filesystem fs.FS) error {
f, err := filesystem.Open(file)
if err != nil {
return ErrNotFound
}
defer f.Close()
fi, _ := f.Stat()
if fi.IsDir() {
file = filepath.ToSlash(filepath.Join(file, indexPage)) // ToSlash is necessary for Windows. fs.Open and os.Open are different in that aspect.
f, err = filesystem.Open(file)
if err != nil {
return ErrNotFound
}
defer f.Close()
if fi, err = f.Stat(); err != nil {
return err
}
}
ff, ok := f.(io.ReadSeeker)
if !ok {
return errors.New("file does not implement io.ReadSeeker")
}
http.ServeContent(c.Response(), c.Request(), fi.Name(), fi.ModTime(), ff)
return nil
}

3
context_fs_go1.16_test.go → context_fs_test.go
View File

@ -1,6 +1,3 @@
//go:build go1.16
// +build go1.16
package echo
import (

175
echo_fs.go
View File

@ -1,62 +1,175 @@
//go:build !go1.16
// +build !go1.16
package echo
import (
"fmt"
"io/fs"
"net/http"
"net/url"
"os"
"path/filepath"
"runtime"
"strings"
)
type filesystem struct {
// Filesystem is file system used by Static and File handlers to access files.
// Defaults to os.DirFS(".")
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
Filesystem fs.FS
}
func createFilesystem() filesystem {
return filesystem{}
return filesystem{
Filesystem: newDefaultFS(),
}
}
// Static registers a new route with path prefix to serve static files from the
// provided root directory.
func (e *Echo) Static(prefix, root string) *Route {
if root == "" {
root = "." // For security we want to restrict to CWD.
}
return e.static(prefix, root, e.GET)
// Static registers a new route with path prefix to serve static files from the provided root directory.
func (e *Echo) Static(pathPrefix, fsRoot string) *Route {
subFs := MustSubFS(e.Filesystem, fsRoot)
return e.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(subFs, false),
)
}
func (common) static(prefix, root string, get func(string, HandlerFunc, ...MiddlewareFunc) *Route) *Route {
h := func(c Context) error {
p, err := url.PathUnescape(c.Param("*"))
// StaticFS registers a new route with path prefix to serve static files from the provided file system.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (e *Echo) StaticFS(pathPrefix string, filesystem fs.FS) *Route {
return e.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(filesystem, false),
)
}
// StaticDirectoryHandler creates handler function to serve files from provided file system
// When disablePathUnescaping is set then file name from path is not unescaped and is served as is.
func StaticDirectoryHandler(fileSystem fs.FS, disablePathUnescaping bool) HandlerFunc {
return func(c Context) error {
p := c.Param("*")
if !disablePathUnescaping { // when router is already unescaping we do not want to do is twice
tmpPath, err := url.PathUnescape(p)
if err != nil {
return err
return fmt.Errorf("failed to unescape path variable: %w", err)
}
p = tmpPath
}
name := filepath.Join(root, filepath.Clean("/"+p)) // "/"+ for security
fi, err := os.Stat(name)
// fs.FS.Open() already assumes that file names are relative to FS root path and considers name with prefix `/` as invalid
name := filepath.ToSlash(filepath.Clean(strings.TrimPrefix(p, "/")))
fi, err := fs.Stat(fileSystem, name)
if err != nil {
// The access path does not exist
return NotFoundHandler(c)
return ErrNotFound
}
// If the request is for a directory and does not end with "/"
p = c.Request().URL.Path // path must not be empty.
if fi.IsDir() && p[len(p)-1] != '/' {
if fi.IsDir() && len(p) > 0 && p[len(p)-1] != '/' {
// Redirect to ends with "/"
return c.Redirect(http.StatusMovedPermanently, p+"/")
return c.Redirect(http.StatusMovedPermanently, sanitizeURI(p+"/"))
}
return c.File(name)
return fsFile(c, name, fileSystem)
}
// Handle added routes based on trailing slash:
// /prefix => exact route "/prefix" + any route "/prefix/*"
// /prefix/ => only any route "/prefix/*"
if prefix != "" {
if prefix[len(prefix)-1] == '/' {
// Only add any route for intentional trailing slash
return get(prefix+"*", h)
}
get(prefix, h)
// FileFS registers a new route with path to serve file from the provided file system.
func (e *Echo) FileFS(path, file string, filesystem fs.FS, m ...MiddlewareFunc) *Route {
return e.GET(path, StaticFileHandler(file, filesystem), m...)
}
return get(prefix+"/*", h)
// StaticFileHandler creates handler function to serve file from provided file system
func StaticFileHandler(file string, filesystem fs.FS) HandlerFunc {
return func(c Context) error {
return fsFile(c, file, filesystem)
}
}
// defaultFS exists to preserve pre v4.7.0 behaviour where files were open by `os.Open`.
// v4.7 introduced `echo.Filesystem` field which is Go1.16+ `fs.Fs` interface.
// Difference between `os.Open` and `fs.Open` is that FS does not allow opening path that start with `.`, `..` or `/`
// etc. For example previously you could have `../images` in your application but `fs := os.DirFS("./")` would not
// allow you to use `fs.Open("../images")` and this would break all old applications that rely on being able to
// traverse up from current executable run path.
// NB: private because you really should use fs.FS implementation instances
type defaultFS struct {
prefix string
fs fs.FS
}
func newDefaultFS() *defaultFS {
dir, _ := os.Getwd()
return &defaultFS{
prefix: dir,
fs: nil,
}
}
func (fs defaultFS) Open(name string) (fs.File, error) {
if fs.fs == nil {
return os.Open(name)
}
return fs.fs.Open(name)
}
func subFS(currentFs fs.FS, root string) (fs.FS, error) {
root = filepath.ToSlash(filepath.Clean(root)) // note: fs.FS operates only with slashes. `ToSlash` is necessary for Windows
if dFS, ok := currentFs.(*defaultFS); ok {
// we need to make exception for `defaultFS` instances as it interprets root prefix differently from fs.FS.
// fs.Fs.Open does not like relative paths ("./", "../") and absolute paths at all but prior echo.Filesystem we
// were able to use paths like `./myfile.log`, `/etc/hosts` and these would work fine with `os.Open` but not with fs.Fs
if isRelativePath(root) {
root = filepath.Join(dFS.prefix, root)
}
return &defaultFS{
prefix: root,
fs: os.DirFS(root),
}, nil
}
return fs.Sub(currentFs, root)
}
func isRelativePath(path string) bool {
if path == "" {
return true
}
if path[0] == '/' {
return false
}
if runtime.GOOS == "windows" && strings.IndexByte(path, ':') != -1 {
// https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file?redirectedfrom=MSDN#file_and_directory_names
// https://docs.microsoft.com/en-us/dotnet/standard/io/file-path-formats
return false
}
return true
}
// MustSubFS creates sub FS from current filesystem or panic on failure.
// Panic happens when `fsRoot` contains invalid path according to `fs.ValidPath` rules.
//
// MustSubFS is helpful when dealing with `embed.FS` because for example `//go:embed assets/images` embeds files with
// paths including `assets/images` as their prefix. In that case use `fs := echo.MustSubFS(fs, "rootDirectory") to
// create sub fs which uses necessary prefix for directory path.
func MustSubFS(currentFs fs.FS, fsRoot string) fs.FS {
subFs, err := subFS(currentFs, fsRoot)
if err != nil {
panic(fmt.Errorf("can not create sub FS, invalid root given, err: %w", err))
}
return subFs
}
func sanitizeURI(uri string) string {
// double slash `\\`, `//` or even `\/` is absolute uri for browsers and by redirecting request to that uri
// we are vulnerable to open redirect attack. so replace all slashes from the beginning with single slash
if len(uri) > 1 && (uri[0] == '\\' || uri[0] == '/') && (uri[1] == '\\' || uri[1] == '/') {
uri = "/" + strings.TrimLeft(uri, `/\`)
}
return uri
}

169
echo_fs_go1.16.go
View File

@ -1,169 +0,0 @@
//go:build go1.16
// +build go1.16
package echo
import (
"fmt"
"io/fs"
"net/http"
"net/url"
"os"
"path/filepath"
"runtime"
"strings"
)
type filesystem struct {
// Filesystem is file system used by Static and File handlers to access files.
// Defaults to os.DirFS(".")
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
Filesystem fs.FS
}
func createFilesystem() filesystem {
return filesystem{
Filesystem: newDefaultFS(),
}
}
// Static registers a new route with path prefix to serve static files from the provided root directory.
func (e *Echo) Static(pathPrefix, fsRoot string) *Route {
subFs := MustSubFS(e.Filesystem, fsRoot)
return e.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(subFs, false),
)
}
// StaticFS registers a new route with path prefix to serve static files from the provided file system.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (e *Echo) StaticFS(pathPrefix string, filesystem fs.FS) *Route {
return e.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(filesystem, false),
)
}
// StaticDirectoryHandler creates handler function to serve files from provided file system
// When disablePathUnescaping is set then file name from path is not unescaped and is served as is.
func StaticDirectoryHandler(fileSystem fs.FS, disablePathUnescaping bool) HandlerFunc {
return func(c Context) error {
p := c.Param("*")
if !disablePathUnescaping { // when router is already unescaping we do not want to do is twice
tmpPath, err := url.PathUnescape(p)
if err != nil {
return fmt.Errorf("failed to unescape path variable: %w", err)
}
p = tmpPath
}
// fs.FS.Open() already assumes that file names are relative to FS root path and considers name with prefix `/` as invalid
name := filepath.ToSlash(filepath.Clean(strings.TrimPrefix(p, "/")))
fi, err := fs.Stat(fileSystem, name)
if err != nil {
return ErrNotFound
}
// If the request is for a directory and does not end with "/"
p = c.Request().URL.Path // path must not be empty.
if fi.IsDir() && len(p) > 0 && p[len(p)-1] != '/' {
// Redirect to ends with "/"
return c.Redirect(http.StatusMovedPermanently, p+"/")
}
return fsFile(c, name, fileSystem)
}
}
// FileFS registers a new route with path to serve file from the provided file system.
func (e *Echo) FileFS(path, file string, filesystem fs.FS, m ...MiddlewareFunc) *Route {
return e.GET(path, StaticFileHandler(file, filesystem), m...)
}
// StaticFileHandler creates handler function to serve file from provided file system
func StaticFileHandler(file string, filesystem fs.FS) HandlerFunc {
return func(c Context) error {
return fsFile(c, file, filesystem)
}
}
// defaultFS exists to preserve pre v4.7.0 behaviour where files were open by `os.Open`.
// v4.7 introduced `echo.Filesystem` field which is Go1.16+ `fs.Fs` interface.
// Difference between `os.Open` and `fs.Open` is that FS does not allow opening path that start with `.`, `..` or `/`
// etc. For example previously you could have `../images` in your application but `fs := os.DirFS("./")` would not
// allow you to use `fs.Open("../images")` and this would break all old applications that rely on being able to
// traverse up from current executable run path.
// NB: private because you really should use fs.FS implementation instances
type defaultFS struct {
prefix string
fs fs.FS
}
func newDefaultFS() *defaultFS {
dir, _ := os.Getwd()
return &defaultFS{
prefix: dir,
fs: nil,
}
}
func (fs defaultFS) Open(name string) (fs.File, error) {
if fs.fs == nil {
return os.Open(name)
}
return fs.fs.Open(name)
}
func subFS(currentFs fs.FS, root string) (fs.FS, error) {
root = filepath.ToSlash(filepath.Clean(root)) // note: fs.FS operates only with slashes. `ToSlash` is necessary for Windows
if dFS, ok := currentFs.(*defaultFS); ok {
// we need to make exception for `defaultFS` instances as it interprets root prefix differently from fs.FS.
// fs.Fs.Open does not like relative paths ("./", "../") and absolute paths at all but prior echo.Filesystem we
// were able to use paths like `./myfile.log`, `/etc/hosts` and these would work fine with `os.Open` but not with fs.Fs
if isRelativePath(root) {
root = filepath.Join(dFS.prefix, root)
}
return &defaultFS{
prefix: root,
fs: os.DirFS(root),
}, nil
}
return fs.Sub(currentFs, root)
}
func isRelativePath(path string) bool {
if path == "" {
return true
}
if path[0] == '/' {
return false
}
if runtime.GOOS == "windows" && strings.IndexByte(path, ':') != -1 {
// https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file?redirectedfrom=MSDN#file_and_directory_names
// https://docs.microsoft.com/en-us/dotnet/standard/io/file-path-formats
return false
}
return true
}
// MustSubFS creates sub FS from current filesystem or panic on failure.
// Panic happens when `fsRoot` contains invalid path according to `fs.ValidPath` rules.
//
// MustSubFS is helpful when dealing with `embed.FS` because for example `//go:embed assets/images` embeds files with
// paths including `assets/images` as their prefix. In that case use `fs := echo.MustSubFS(fs, "rootDirectory") to
// create sub fs which uses necessary prefix for directory path.
func MustSubFS(currentFs fs.FS, fsRoot string) fs.FS {
subFs, err := subFS(currentFs, fsRoot)
if err != nil {
panic(fmt.Errorf("can not create sub FS, invalid root given, err: %w", err))
}
return subFs
}

12
echo_fs_go1.16_test.go → echo_fs_test.go
View File

@ -1,6 +1,3 @@
//go:build go1.16
// +build go1.16
package echo
import (
@ -139,6 +136,15 @@ func TestEcho_StaticFS(t *testing.T) {
expectStatus: http.StatusNotFound,
expectBodyStartsWith: "{\"message\":\"Not Found\"}\n",
},
{
name: "open redirect vulnerability",
givenPrefix: "/",
givenFs: os.DirFS("_fixture/"),
whenURL: "/open.redirect.hackercom%2f..",
expectStatus: http.StatusMovedPermanently,
expectHeaderLocation: "/open.redirect.hackercom/../", // location starting with `//open` would be very bad
expectBodyStartsWith: "",
},
}
for _, tc := range testCases {

31
group_fs.go
View File

@ -1,9 +1,30 @@
//go:build !go1.16
// +build !go1.16
package echo
import (
"io/fs"
"net/http"
)
// Static implements `Echo#Static()` for sub-routes within the Group.
func (g *Group) Static(prefix, root string) {
g.static(prefix, root, g.GET)
func (g *Group) Static(pathPrefix, fsRoot string) {
subFs := MustSubFS(g.echo.Filesystem, fsRoot)
g.StaticFS(pathPrefix, subFs)
}
// StaticFS implements `Echo#StaticFS()` for sub-routes within the Group.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (g *Group) StaticFS(pathPrefix string, filesystem fs.FS) {
g.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(filesystem, false),
)
}
// FileFS implements `Echo#FileFS()` for sub-routes within the Group.
func (g *Group) FileFS(path, file string, filesystem fs.FS, m ...MiddlewareFunc) *Route {
return g.GET(path, StaticFileHandler(file, filesystem), m...)
}

33
group_fs_go1.16.go
View File

@ -1,33 +0,0 @@
//go:build go1.16
// +build go1.16
package echo
import (
"io/fs"
"net/http"
)
// Static implements `Echo#Static()` for sub-routes within the Group.
func (g *Group) Static(pathPrefix, fsRoot string) {
subFs := MustSubFS(g.echo.Filesystem, fsRoot)
g.StaticFS(pathPrefix, subFs)
}
// StaticFS implements `Echo#StaticFS()` for sub-routes within the Group.
//
// When dealing with `embed.FS` use `fs := echo.MustSubFS(fs, "rootDirectory") to create sub fs which uses necessary
// prefix for directory path. This is necessary as `//go:embed assets/images` embeds files with paths
// including `assets/images` as their prefix.
func (g *Group) StaticFS(pathPrefix string, filesystem fs.FS) {
g.Add(
http.MethodGet,
pathPrefix+"*",
StaticDirectoryHandler(filesystem, false),
)
}
// FileFS implements `Echo#FileFS()` for sub-routes within the Group.
func (g *Group) FileFS(path, file string, filesystem fs.FS, m ...MiddlewareFunc) *Route {
return g.GET(path, StaticFileHandler(file, filesystem), m...)
}

3
group_fs_go1.16_test.go → group_fs_test.go
View File

@ -1,6 +1,3 @@
//go:build go1.16
// +build go1.16
package echo
import (

106
middleware/static_1_16_test.go
View File

@ -1,106 +0,0 @@
// +build go1.16
package middleware
import (
"io/fs"
"net/http"
"net/http/httptest"
"os"
"testing"
"testing/fstest"
"github.com/labstack/echo/v4"
"github.com/stretchr/testify/assert"
)
func TestStatic_CustomFS(t *testing.T) {
var testCases = []struct {
name string
filesystem fs.FS
root string
whenURL string
expectContains string
expectCode int
}{
{
name: "ok, serve index with Echo message",
whenURL: "/",
filesystem: os.DirFS("../_fixture"),
expectCode: http.StatusOK,
expectContains: "<title>Echo</title>",
},
{
name: "ok, serve index with Echo message",
whenURL: "/_fixture/",
filesystem: os.DirFS(".."),
expectCode: http.StatusOK,
expectContains: "<title>Echo</title>",
},
{
name: "ok, serve file from map fs",
whenURL: "/file.txt",
filesystem: fstest.MapFS{
"file.txt": &fstest.MapFile{Data: []byte("file.txt is ok")},
},
expectCode: http.StatusOK,
expectContains: "file.txt is ok",
},
{
name: "nok, missing file in map fs",
whenURL: "/file.txt",
expectCode: http.StatusNotFound,
filesystem: fstest.MapFS{
"file2.txt": &fstest.MapFile{Data: []byte("file2.txt is ok")},
},
},
{
name: "nok, file is not a subpath of root",
whenURL: `/../../secret.txt`,
root: "/nested/folder",
filesystem: fstest.MapFS{
"secret.txt": &fstest.MapFile{Data: []byte("this is a secret")},
},
expectCode: http.StatusNotFound,
},
{
name: "nok, backslash is forbidden",
whenURL: `/..\..\secret.txt`,
expectCode: http.StatusNotFound,
root: "/nested/folder",
filesystem: fstest.MapFS{
"secret.txt": &fstest.MapFile{Data: []byte("this is a secret")},
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
e := echo.New()
config := StaticConfig{
Root: ".",
Filesystem: http.FS(tc.filesystem),
}
if tc.root != "" {
config.Root = tc.root
}
middlewareFunc := StaticWithConfig(config)
e.Use(middlewareFunc)
req := httptest.NewRequest(http.MethodGet, tc.whenURL, nil)
rec := httptest.NewRecorder()
e.ServeHTTP(rec, req)
assert.Equal(t, tc.expectCode, rec.Code)
if tc.expectContains != "" {
responseBody := rec.Body.String()
assert.Contains(t, responseBody, tc.expectContains)
}
})
}
}

103
middleware/static_test.go
View File

@ -1,10 +1,13 @@
package middleware
import (
"io/fs"
"net/http"
"net/http/httptest"
"os"
"strings"
"testing"
"testing/fstest"
"github.com/labstack/echo/v4"
"github.com/stretchr/testify/assert"
@ -207,6 +210,15 @@ func TestStatic_GroupWithStatic(t *testing.T) {
expectHeaderLocation: "/group/folder/",
expectBodyStartsWith: "",
},
{
name: "Directory redirect",
givenPrefix: "/",
givenRoot: "../_fixture",
whenURL: "/group/folder%2f..",
expectStatus: http.StatusMovedPermanently,
expectHeaderLocation: "/group/folder/../",
expectBodyStartsWith: "",
},
{
name: "Prefixed directory 404 (request URL without slash)",
givenGroup: "_fixture",
@ -306,3 +318,94 @@ func TestStatic_GroupWithStatic(t *testing.T) {
})
}
}
func TestStatic_CustomFS(t *testing.T) {
var testCases = []struct {
name string
filesystem fs.FS
root string
whenURL string
expectContains string
expectCode int
}{
{
name: "ok, serve index with Echo message",
whenURL: "/",
filesystem: os.DirFS("../_fixture"),
expectCode: http.StatusOK,
expectContains: "<title>Echo</title>",
},
{
name: "ok, serve index with Echo message",
whenURL: "/_fixture/",
filesystem: os.DirFS(".."),
expectCode: http.StatusOK,
expectContains: "<title>Echo</title>",
},
{
name: "ok, serve file from map fs",
whenURL: "/file.txt",
filesystem: fstest.MapFS{
"file.txt": &fstest.MapFile{Data: []byte("file.txt is ok")},
},
expectCode: http.StatusOK,
expectContains: "file.txt is ok",
},
{
name: "nok, missing file in map fs",
whenURL: "/file.txt",
expectCode: http.StatusNotFound,
filesystem: fstest.MapFS{
"file2.txt": &fstest.MapFile{Data: []byte("file2.txt is ok")},
},
},
{
name: "nok, file is not a subpath of root",
whenURL: `/../../secret.txt`,
root: "/nested/folder",
filesystem: fstest.MapFS{
"secret.txt": &fstest.MapFile{Data: []byte("this is a secret")},
},
expectCode: http.StatusNotFound,
},
{
name: "nok, backslash is forbidden",
whenURL: `/..\..\secret.txt`,
expectCode: http.StatusNotFound,
root: "/nested/folder",
filesystem: fstest.MapFS{
"secret.txt": &fstest.MapFile{Data: []byte("this is a secret")},
},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
e := echo.New()
config := StaticConfig{
Root: ".",
Filesystem: http.FS(tc.filesystem),
}
if tc.root != "" {
config.Root = tc.root
}
middlewareFunc := StaticWithConfig(config)
e.Use(middlewareFunc)
req := httptest.NewRequest(http.MethodGet, tc.whenURL, nil)
rec := httptest.NewRecorder()
e.ServeHTTP(rec, req)
assert.Equal(t, tc.expectCode, rec.Code)
if tc.expectContains != "" {
responseBody := rec.Body.String()
assert.Contains(t, responseBody, tc.expectContains)
}
})
}
}