2017-04-06 16:50:07 +05:30
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/*
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Copyright 2017 Vector Creations Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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2022-02-09 21:36:44 +05:30
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"archive/tar"
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2017-04-06 16:50:07 +05:30
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"compress/gzip"
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"io"
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"log"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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)
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// logServer is an http.handler which will serve up bugreports
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type logServer struct {
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root string
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}
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func (f *logServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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upath := r.URL.Path
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if !strings.HasPrefix(upath, "/") {
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upath = "/" + upath
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r.URL.Path = upath
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}
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log.Println("Serving", upath)
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// eliminate ., .., //, etc
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upath = path.Clean(upath)
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// reject some dodgy paths. This is based on the code for http.Dir.Open (see https://golang.org/src/net/http/fs.go#L37).
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//
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// the check for '..' is a sanity-check because my understanding of `path.Clean` is that it should never return
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// a value including '..' for input starting with '/'. It's taken from the code for http.ServeFile
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// (https://golang.org/src/net/http/fs.go#L637).
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if containsDotDot(upath) || strings.Contains(upath, "\x00") || (filepath.Separator != '/' && strings.IndexRune(upath, filepath.Separator) >= 0) {
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http.Error(w, "invalid URL path", http.StatusBadRequest)
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return
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}
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// convert to abs path
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upath, err := filepath.Abs(filepath.Join(f.root, filepath.FromSlash(upath)))
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if err != nil {
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msg, code := toHTTPError(err)
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http.Error(w, msg, code)
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return
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}
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serveFile(w, r, upath)
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}
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func serveFile(w http.ResponseWriter, r *http.Request, path string) {
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d, err := os.Stat(path)
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if err != nil {
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msg, code := toHTTPError(err)
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http.Error(w, msg, code)
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return
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}
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2017-05-02 22:23:12 +05:30
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// for anti-XSS belt-and-braces, set a very restrictive CSP
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w.Header().Set("Content-Security-Policy", "default-src: none")
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// if it's a directory, serve a listing or a tarball
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if d.IsDir() {
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format, _ := r.URL.Query()["format"]
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if len(format) == 1 && format[0] == "tar.gz" {
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log.Println("Serving tarball of", path)
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err := serveTarball(w, r, path)
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if err != nil {
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log.Println("Error", err)
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}
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return
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}
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log.Println("Serving directory listing of", path)
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http.ServeFile(w, r, path)
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return
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}
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2017-05-02 22:23:12 +05:30
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// if it's a gzipped log file, serve it as text
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if strings.HasSuffix(path, ".gz") {
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serveGzippedFile(w, r, path, d.Size())
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return
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}
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// otherwise, limit ourselves to a number of known-safe content-types, to
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// guard against XSS vulnerabilities.
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// http.serveFile preserves the content-type header if one is already set.
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w.Header().Set("Content-Type", extensionToMimeType(path))
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http.ServeFile(w, r, path)
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}
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// extensionToMimeType returns a suitable mime type for the given filename
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//
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// Unlike mime.TypeByExtension, the results are limited to a set of types which
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// should be safe to serve to a browser without introducing XSS vulnerabilities.
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func extensionToMimeType(path string) string {
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if strings.HasSuffix(path, ".txt") {
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// anyone uploading text in anything other than utf-8 needs to be
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// re-educated.
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return "text/plain; charset=utf-8"
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}
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if strings.HasSuffix(path, ".png") {
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return "image/png"
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}
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if strings.HasSuffix(path, ".jpg") {
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return "image/jpeg"
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}
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2022-02-08 19:50:45 +05:30
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if strings.HasSuffix(path, ".json") {
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return "application/json"
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}
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return "application/octet-stream"
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}
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2022-02-09 21:36:44 +05:30
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// Streams a dynamically created tar.gz file with the contents of the given directory
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// Will serve a partial, corrupted response if there is a error partway through the
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// operation as we stream the response.
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//
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// The resultant tarball will contain a single directory containing all the files
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// so it can unpack cleanly without overwriting other files.
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func serveTarball(w http.ResponseWriter, r *http.Request, dir string) error {
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directory, err := os.Open(dir)
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if err != nil {
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return err
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}
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// "disposition filename"
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dfilename := strings.Trim(r.URL.Path,"/")
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dfilename = strings.Replace(dfile, "/","_",-1)
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// There is no application/tgz or similar; return a gzip file as best option.
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// This tends to trigger archive type tools, which will then use the filename to
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// identify the contents correctly.
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w.Header().Set("Content-Type", "application/gzip")
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w.Header().Set("Content-Disposition", "attachment; filename=" + dfilename+".tar.gz")
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filenames, err := directory.Readdirnames(-1)
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if err != nil {
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return err
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}
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gzip := gzip.NewWriter(w)
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defer gzip.Close()
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targz := tar.NewWriter(gzip)
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defer targz.Close()
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for _, filename := range filenames {
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path := dir + "/" + filename
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err := addToArchive(targz, dfilename, path)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Add a single file into the archive.
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func addToArchive(targz *tar.Writer, dfilename string, filename string) error {
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file, err := os.Open(filename)
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if err != nil {
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return err
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}
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defer file.Close()
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info, err := file.Stat()
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if err != nil {
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return err
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}
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header, err := tar.FileInfoHeader(info, info.Name())
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if err != nil {
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return err
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}
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header.Name = dfilename + "/" + info.Name()
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err = targz.WriteHeader(header)
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if err != nil {
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return err
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}
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_, err = io.Copy(targz, file)
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if err != nil {
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return err
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}
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return nil
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}
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2017-05-02 22:23:12 +05:30
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func serveGzippedFile(w http.ResponseWriter, r *http.Request, path string, size int64) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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acceptsGzip := false
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splitRune := func(s rune) bool { return s == ' ' || s == '\t' || s == '\n' || s == ',' }
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for _, hdr := range r.Header["Accept-Encoding"] {
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for _, enc := range strings.FieldsFunc(hdr, splitRune) {
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if enc == "gzip" {
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acceptsGzip = true
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break
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}
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}
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}
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if acceptsGzip {
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serveGzip(w, r, path, size)
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} else {
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serveUngzipped(w, r, path)
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}
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}
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// serveGzip serves a gzipped file with gzip content-encoding
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func serveGzip(w http.ResponseWriter, r *http.Request, path string, size int64) {
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f, err := os.Open(path)
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if err != nil {
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msg, code := toHTTPError(err)
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http.Error(w, msg, code)
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return
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}
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defer f.Close()
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w.Header().Set("Content-Encoding", "gzip")
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w.Header().Set("Content-Length", strconv.FormatInt(size, 10))
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w.WriteHeader(http.StatusOK)
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io.Copy(w, f)
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}
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// serveUngzipped ungzips a gzipped file and serves it
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func serveUngzipped(w http.ResponseWriter, r *http.Request, path string) {
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f, err := os.Open(path)
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if err != nil {
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msg, code := toHTTPError(err)
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http.Error(w, msg, code)
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return
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}
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defer f.Close()
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gz, err := gzip.NewReader(f)
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if err != nil {
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msg, code := toHTTPError(err)
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http.Error(w, msg, code)
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return
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}
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defer gz.Close()
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w.WriteHeader(http.StatusOK)
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io.Copy(w, gz)
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}
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func toHTTPError(err error) (msg string, httpStatus int) {
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if os.IsNotExist(err) {
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return "404 page not found", http.StatusNotFound
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}
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if os.IsPermission(err) {
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return "403 Forbidden", http.StatusForbidden
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}
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// Default:
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return "500 Internal Server Error", http.StatusInternalServerError
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}
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func containsDotDot(v string) bool {
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if !strings.Contains(v, "..") {
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return false
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}
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for _, ent := range strings.FieldsFunc(v, isSlashRune) {
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if ent == ".." {
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return true
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}
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}
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return false
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}
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func isSlashRune(r rune) bool { return r == '/' || r == '\\' }
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