Add support for attaching files to reports (#14)
* Create report dir before reading POST body ... so that we can stream uploaded files straight to disk, instead of reading them into memory first. * Add support for attaching files to reports If a 'file' parameter is provided, save it as a file on disk. Also include a link to it from the github issue.
This commit is contained in:
Richard van der Hoff
GitHub
parent
9bbdf64e5f
commit
530fcd69db
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@ -64,6 +64,13 @@ logs.)
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Compressed logs are not supported for the JSON upload encoding.
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* `file`: an arbitrary file to attach to the report. Saved as-is to disk, and
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a link is added to the github issue. The filename must be in the format
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`name.ext`, where `name` contains only alphanumerics, `-` or `_`, and `ext`
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is one of `jpg`, `png`, or `txt`.
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Not supported for the JSON upload encoding.
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* Any other form field names are interpreted as arbitrary name/value strings to
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include in the `details.log.gz` file.
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@ -76,13 +76,53 @@ func serveFile(w http.ResponseWriter, r *http.Request, path string) {
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return
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}
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// if it's a directory, or doesn't look like a gzip, serve as normal
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if d.IsDir() || !strings.HasSuffix(path, ".gz") {
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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
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if d.IsDir() {
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log.Println("Serving", path)
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http.ServeFile(w, r, path)
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return
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}
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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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return "application/octet-stream"
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}
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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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@ -97,7 +137,7 @@ func serveFile(w http.ResponseWriter, r *http.Request, path string) {
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}
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if acceptsGzip {
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serveGzip(w, r, path, d.Size())
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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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@ -31,6 +31,7 @@ import (
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"net/http"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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@ -57,6 +58,7 @@ type payload struct {
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UserAgent string `json:"user_agent"`
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Logs []logEntry `json:"logs"`
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Data map[string]string `json:"data"`
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Files []string
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}
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type logEntry struct {
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@ -83,13 +85,32 @@ func (s *submitServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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return
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}
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p := parseRequest(w, req)
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if p == nil {
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// parseRequest already wrote an error
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// create the report dir before parsing the request, so that we can dump
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// files straight in
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t := time.Now().UTC()
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prefix := t.Format("2006-01-02/150405")
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reportDir := filepath.Join("bugs", prefix)
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if err := os.MkdirAll(reportDir, os.ModePerm); err != nil {
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log.Println("Unable to create report directory", err)
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http.Error(w, "Internal error", 500)
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return
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}
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resp, err := s.saveReport(req.Context(), *p)
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listingURL := s.apiPrefix + "/listing/" + prefix
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log.Println("Handling report submission; listing URI will be", listingURL)
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p := parseRequest(w, req, reportDir)
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if p == nil {
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// parseRequest already wrote an error, but now let's delete the
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// useless report dir
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if err := os.RemoveAll(reportDir); err != nil {
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log.Printf("Unable to remove report dir %s after invalid upload: %v\n",
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reportDir, err)
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}
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return
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}
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resp, err := s.saveReport(req.Context(), *p, reportDir, listingURL)
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if err != nil {
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log.Println("Error handling report", err)
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http.Error(w, "Internal error", 500)
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@ -103,7 +124,7 @@ func (s *submitServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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// parseRequest attempts to parse a received request as a bug report. If
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// the request cannot be parsed, it responds with an error and returns nil.
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func parseRequest(w http.ResponseWriter, req *http.Request) *payload {
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func parseRequest(w http.ResponseWriter, req *http.Request, reportDir string) *payload {
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length, err := strconv.Atoi(req.Header.Get("Content-Length"))
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if err != nil {
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log.Println("Couldn't parse content-length", err)
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@ -120,7 +141,7 @@ func parseRequest(w http.ResponseWriter, req *http.Request) *payload {
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if contentType != "" {
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d, _, _ := mime.ParseMediaType(contentType)
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if d == "multipart/form-data" {
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p, err1 := parseMultipartRequest(w, req)
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p, err1 := parseMultipartRequest(w, req, reportDir)
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if err1 != nil {
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log.Println("Error parsing multipart data", err1)
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http.Error(w, "Bad multipart data", 400)
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@ -177,7 +198,7 @@ func parseJSONRequest(w http.ResponseWriter, req *http.Request) (*payload, error
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return &p, nil
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}
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func parseMultipartRequest(w http.ResponseWriter, req *http.Request) (*payload, error) {
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func parseMultipartRequest(w http.ResponseWriter, req *http.Request, reportDir string) (*payload, error) {
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rdr, err := req.MultipartReader()
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if err != nil {
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return nil, err
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@ -196,14 +217,14 @@ func parseMultipartRequest(w http.ResponseWriter, req *http.Request) (*payload,
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return nil, err
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}
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if err = parseFormPart(part, &p); err != nil {
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if err = parseFormPart(part, &p, reportDir); err != nil {
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return nil, err
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}
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}
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return &p, nil
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}
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func parseFormPart(part *multipart.Part, p *payload) error {
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func parseFormPart(part *multipart.Part, p *payload, reportDir string) error {
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defer part.Close()
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field := part.FormName()
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@ -220,6 +241,16 @@ func parseFormPart(part *multipart.Part, p *payload) error {
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// read the field data directly from the multipart part
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partReader = part
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}
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if field == "file" {
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leafName, err := saveFormPart(part.FileName(), partReader, reportDir)
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if err != nil {
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return err
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}
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p.Files = append(p.Files, leafName)
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return nil
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}
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b, err := ioutil.ReadAll(partReader)
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if err != nil {
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return err
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@ -235,6 +266,8 @@ func parseFormPart(part *multipart.Part, p *payload) error {
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} else if field == "user_agent" {
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p.UserAgent = data
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} else if field == "log" || field == "compressed-log" {
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// todo: we could save the log directly rather than pointlessly
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// unzipping and re-zipping.
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p.Logs = append(p.Logs, logEntry{
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ID: part.FileName(),
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Lines: data,
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@ -245,20 +278,48 @@ func parseFormPart(part *multipart.Part, p *payload) error {
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return nil
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}
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func (s *submitServer) saveReport(ctx context.Context, p payload) (*submitResponse, error) {
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// we use a quite restrictive regexp for the filenames; in particular:
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//
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// * a limited set of extensions. We are careful to limit the content-types
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// we will serve the files with, but somebody might accidentally point an
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// Apache or nginx at the upload directory, which would serve js files as
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// application/javascript and open XSS vulnerabilities.
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//
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// * no silly characters (/, ctrl chars, etc)
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//
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// * nothing starting with '.'
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var filenameRegexp = regexp.MustCompile(`^[a-zA-Z0-9_-]+\.(jpg|png|txt)$`)
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// saveFormPart saves a file upload to the report directory.
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//
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// Returns the leafname of the saved file.
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func saveFormPart(leafName string, reader io.Reader, reportDir string) (string, error) {
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if !filenameRegexp.MatchString(leafName) {
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return "", fmt.Errorf("Invalid upload filename")
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}
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fullName := filepath.Join(reportDir, leafName)
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log.Println("Saving uploaded file", leafName, "to", fullName)
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f, err := os.Create(fullName)
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if err != nil {
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return "", err
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}
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defer f.Close()
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_, err = io.Copy(f, reader)
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if err != nil {
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return "", err
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}
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return leafName, nil
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}
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func (s *submitServer) saveReport(ctx context.Context, p payload, reportDir, listingURL string) (*submitResponse, error) {
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resp := submitResponse{}
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// Dump bug report to disk as form:
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// "bugreport-20170115-112233.log.gz" => user text, version, user agent, # logs
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// "bugreport-20170115-112233-0.log.gz" => most recent log
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// "bugreport-20170115-112233-1.log.gz" => ...
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// "bugreport-20170115-112233-N.log.gz" => oldest log
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t := time.Now().UTC()
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prefix := t.Format("2006-01-02/150405")
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listingURL := s.apiPrefix + "/listing/" + prefix
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log.Println("Handling report submission; listing URI will be", listingURL)
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var summaryBuf bytes.Buffer
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fmt.Fprintf(
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&summaryBuf,
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@ -268,12 +329,12 @@ func (s *submitServer) saveReport(ctx context.Context, p payload) (*submitRespon
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for k, v := range p.Data {
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fmt.Fprintf(&summaryBuf, "%s: %s\n", k, v)
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}
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if err := gzipAndSave(summaryBuf.Bytes(), prefix, "details.log.gz"); err != nil {
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if err := gzipAndSave(summaryBuf.Bytes(), reportDir, "details.log.gz"); err != nil {
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return nil, err
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}
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for i, log := range p.Logs {
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if err := gzipAndSave([]byte(log.Lines), prefix, fmt.Sprintf("logs-%04d.log.gz", i)); err != nil {
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if err := gzipAndSave([]byte(log.Lines), reportDir, fmt.Sprintf("logs-%04d.log.gz", i)); err != nil {
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return nil, err // TODO: Rollback?
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}
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}
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@ -331,9 +392,18 @@ func buildGithubIssueRequest(p payload, listingURL string) github.IssueRequest {
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if p.Version != "" {
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fmt.Fprintf(&bodyBuf, "Version: `%s`\n", p.Version)
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}
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fmt.Fprintf(&bodyBuf, "[Logs](%s)\n", listingURL)
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body := bodyBuf.String()
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fmt.Fprintf(&bodyBuf, "[Logs](%s)", listingURL)
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for _, file := range p.Files {
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fmt.Fprintf(
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&bodyBuf,
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" / [%s](%s)",
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file,
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listingURL+"/"+file,
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)
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}
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body := bodyBuf.String()
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return github.IssueRequest{
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Title: &title,
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Body: &body,
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@ -346,8 +416,7 @@ func respond(code int, w http.ResponseWriter) {
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}
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func gzipAndSave(data []byte, dirname, fpath string) error {
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_ = os.MkdirAll(filepath.Join("bugs", dirname), os.ModePerm)
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fpath = filepath.Join("bugs", dirname, fpath)
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fpath = filepath.Join(dirname, fpath)
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if _, err := os.Stat(fpath); err == nil {
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return fmt.Errorf("file already exists") // the user can just retry
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@ -17,8 +17,11 @@ limitations under the License.
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package main
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import (
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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@ -26,7 +29,10 @@ import (
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// testParsePayload builds a /submit request with the given body, and calls
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// parseRequest with it.
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func testParsePayload(t *testing.T, body, contentType string) (p *payload) {
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//
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// if tempDir is empty, a new temp dir is created, and deleted when the test
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// completes.
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func testParsePayload(t *testing.T, body, contentType string, tempDir string) (*payload, *http.Response) {
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req, err := http.NewRequest("POST", "/api/submit", strings.NewReader(body))
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if err != nil {
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t.Fatal(err)
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@ -35,20 +41,26 @@ func testParsePayload(t *testing.T, body, contentType string) (p *payload) {
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if contentType != "" {
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req.Header.Set("Content-Type", contentType)
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}
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rr := httptest.NewRecorder()
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p = parseRequest(rr, req)
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if p == nil {
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t.Error("parseRequest returned nil")
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// temporary dir for the uploaded files
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if tempDir == "" {
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tempDir = mkTempDir(t)
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defer os.RemoveAll(tempDir)
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}
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return
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rr := httptest.NewRecorder()
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p := parseRequest(rr, req, tempDir)
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return p, rr.Result()
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}
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func TestEmptyJson(t *testing.T) {
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body := "{}"
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// we just test it is parsed without errors for now
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testParsePayload(t, body, "application/json")
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p, _ := testParsePayload(t, body, "application/json", "")
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if p == nil {
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t.Fatal("parseRequest returned nil")
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}
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}
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// check that we can unpick the json submitted by the android clients
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@ -57,7 +69,10 @@ func TestUnpickAndroidMangling(t *testing.T) {
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"version": "User : @ylc8001:matrix.org\nPhone : Lenovo P2a42\nVector version: 0:6:9\n",
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"user_agent": "Android"
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}`
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p := testParsePayload(t, body, "")
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p, _ := testParsePayload(t, body, "", "")
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if p == nil {
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t.Fatal("parseRequest returned nil")
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}
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if p.Text != "test ylc 001" {
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t.Errorf("user text: got %s, want %s", p.Text, "test ylc 001")
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}
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@ -79,7 +94,35 @@ func TestUnpickAndroidMangling(t *testing.T) {
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}
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func TestMultipartUpload(t *testing.T) {
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body := `------WebKitFormBoundarySsdgl8Nq9voFyhdO
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reportDir := mkTempDir(t)
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defer os.RemoveAll(reportDir)
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p, _ := testParsePayload(t, multipartBody(),
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"multipart/form-data; boundary=----WebKitFormBoundarySsdgl8Nq9voFyhdO",
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reportDir,
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)
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if p == nil {
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t.Fatal("parseRequest returned nil")
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}
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checkParsedMultipartUpload(t, p)
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// check file uploaded correctly
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dat, err := ioutil.ReadFile(filepath.Join(reportDir, "passwd.txt"))
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if err != nil {
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t.Error("unable to read uploaded file", err)
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} else {
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datstr := string(dat)
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wanted := "bibblybobbly"
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if datstr != wanted {
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t.Errorf("File contents: got %s, want %s", datstr, wanted)
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}
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}
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}
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func multipartBody() (body string) {
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body = `------WebKitFormBoundarySsdgl8Nq9voFyhdO
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Content-Disposition: form-data; name="text"
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test words.
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@ -121,10 +164,21 @@ Content-Type: application/octet-stream
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body += string([]byte{
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0x1f, 0x8b, 0x08, 0x00, 0xbf, 0xd8, 0xf5, 0x58, 0x00, 0x03,
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0x2b, 0x49, 0x2d, 0x2e, 0xe1, 0x02, 0x00,
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0xc6, 0x35, 0xb9, 0x3b, 0x05, 0x00, 0x00, 0x00})
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body += "\n------WebKitFormBoundarySsdgl8Nq9voFyhdO--\n"
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0xc6, 0x35, 0xb9, 0x3b, 0x05, 0x00, 0x00, 0x00,
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0x0a,
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})
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p := testParsePayload(t, body, "multipart/form-data; boundary=----WebKitFormBoundarySsdgl8Nq9voFyhdO")
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body += `------WebKitFormBoundarySsdgl8Nq9voFyhdO
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Content-Disposition: form-data; name="file"; filename="passwd.txt"
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Content-Type: application/octet-stream
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bibblybobbly
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`
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body += "------WebKitFormBoundarySsdgl8Nq9voFyhdO--\n"
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return
|
||||
}
|
||||
|
||||
func checkParsedMultipartUpload(t *testing.T, p *payload) {
|
||||
wanted := "test words."
|
||||
if p.Text != wanted {
|
||||
t.Errorf("User text: got %s, want %s", p.Text, wanted)
|
||||
|
|
@ -160,3 +214,45 @@ Content-Type: application/octet-stream
|
|||
t.Errorf("Log 2: got %s, want %s", p.Logs[2].Lines, wanted)
|
||||
}
|
||||
}
|
||||
|
||||
func TestEmptyFilename(t *testing.T) {
|
||||
body := `------WebKitFormBoundarySsdgl8Nq9voFyhdO
|
||||
Content-Disposition: form-data; name="file"
|
||||
|
||||
file
|
||||
------WebKitFormBoundarySsdgl8Nq9voFyhdO--
|
||||
`
|
||||
p, resp := testParsePayload(t, body, "multipart/form-data; boundary=----WebKitFormBoundarySsdgl8Nq9voFyhdO", "")
|
||||
if p != nil {
|
||||
t.Error("parsePayload accepted upload with no filename")
|
||||
}
|
||||
|
||||
if resp.StatusCode != 400 {
|
||||
t.Errorf("response code: got %v, want %v", resp.StatusCode, 400)
|
||||
}
|
||||
}
|
||||
|
||||
func TestBadFilename(t *testing.T) {
|
||||
body := `------WebKitFormBoundarySsdgl8Nq9voFyhdO
|
||||
Content-Disposition: form-data; name="file"; filename="etc/passwd"
|
||||
|
||||
file
|
||||
------WebKitFormBoundarySsdgl8Nq9voFyhdO--
|
||||
`
|
||||
p, resp := testParsePayload(t, body, "multipart/form-data; boundary=----WebKitFormBoundarySsdgl8Nq9voFyhdO", "")
|
||||
if p != nil {
|
||||
t.Error("parsePayload accepted upload with bad filename")
|
||||
}
|
||||
|
||||
if resp.StatusCode != 400 {
|
||||
t.Errorf("response code: got %v, want %v", resp.StatusCode, 400)
|
||||
}
|
||||
}
|
||||
|
||||
func mkTempDir(t *testing.T) string {
|
||||
td, err := ioutil.TempDir("", "rageshake_test")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
return td
|
||||
}
|
||||
|
|
|
|||
Reference in New Issue