X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/7f26842ce8dbc3933086a824648969d1b90555f3..b3b9aeee4dba20bcddd8cb4ee2cdcd3c8a34eaec:/services/keep-web/handler.go diff --git a/services/keep-web/handler.go b/services/keep-web/handler.go index 98dfdb31dd..e1b23621af 100644 --- a/services/keep-web/handler.go +++ b/services/keep-web/handler.go @@ -1,6 +1,7 @@ package main import ( + "flag" "fmt" "html" "io" @@ -8,8 +9,9 @@ import ( "net/http" "net/url" "os" + "regexp" + "strconv" "strings" - "time" "git.curoverse.com/arvados.git/sdk/go/arvadosclient" "git.curoverse.com/arvados.git/sdk/go/auth" @@ -19,19 +21,29 @@ import ( type handler struct{} -var clientPool = arvadosclient.MakeClientPool() -var anonymousTokens []string +var ( + clientPool = arvadosclient.MakeClientPool() + trustAllContent = false + attachmentOnlyHost = "" +) + +func init() { + flag.StringVar(&attachmentOnlyHost, "attachment-only-host", "", + "Accept credentials, and add \"Content-Disposition: attachment\" response headers, for requests at this hostname:port. Prohibiting inline display makes it possible to serve untrusted and non-public content from a single origin, i.e., without wildcard DNS or SSL.") + flag.BoolVar(&trustAllContent, "trust-all-content", false, + "Serve non-public content from a single origin. Dangerous: read docs before using!") +} // return a UUID or PDH if s begins with a UUID or URL-encoded PDH; // otherwise return "". -func parseCollectionIdFromDNSName(s string) string { +func parseCollectionIDFromDNSName(s string) string { // Strip domain. if i := strings.IndexRune(s, '.'); i >= 0 { s = s[:i] } - // Names like {uuid}--dl.example.com serve the same purpose as - // {uuid}.dl.example.com but can reduce cost/effort of using - // [additional] wildcard certificates. + // Names like {uuid}--collections.example.com serve the same + // purpose as {uuid}.collections.example.com but can reduce + // cost/effort of using [additional] wildcard certificates. if i := strings.Index(s, "--"); i >= 0 { s = s[:i] } @@ -48,7 +60,7 @@ var urlPDHDecoder = strings.NewReplacer(" ", "+", "-", "+") // return a UUID or PDH if s is a UUID or a PDH (even if it is a PDH // with "+" replaced by " " or "-"); otherwise return "". -func parseCollectionIdFromURL(s string) string { +func parseCollectionIDFromURL(s string) string { if arvadosclient.UUIDMatch(s) { return s } @@ -62,6 +74,11 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { var statusCode = 0 var statusText string + remoteAddr := r.RemoteAddr + if xff := r.Header.Get("X-Forwarded-For"); xff != "" { + remoteAddr = xff + "," + remoteAddr + } + w := httpserver.WrapResponseWriter(wOrig) defer func() { if statusCode == 0 { @@ -75,7 +92,7 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { if statusText == "" { statusText = http.StatusText(statusCode) } - httpserver.Log(r.RemoteAddr, statusCode, statusText, w.WroteBodyBytes(), r.Method, r.Host, r.URL.Path, r.URL.RawQuery) + httpserver.Log(remoteAddr, statusCode, statusText, w.WroteBodyBytes(), r.Method, r.Host, r.URL.Path, r.URL.RawQuery) }() if r.Method != "GET" && r.Method != "POST" { @@ -83,6 +100,15 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { return } + if r.Header.Get("Origin") != "" { + // Allow simple cross-origin requests without user + // credentials ("user credentials" as defined by CORS, + // i.e., cookies, HTTP authentication, and client-side + // SSL certificates. See + // http://www.w3.org/TR/cors/#user-credentials). + w.Header().Set("Access-Control-Allow-Origin", "*") + } + arv := clientPool.Get() if arv == nil { statusCode, statusText = http.StatusInternalServerError, "Pool failed: "+clientPool.Err().Error() @@ -92,31 +118,39 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { pathParts := strings.Split(r.URL.Path[1:], "/") - var targetId string + var targetID string var targetPath []string var tokens []string var reqTokens []string var pathToken bool - var credentialsOK bool + var attachment bool + credentialsOK := trustAllContent + + if r.Host != "" && r.Host == attachmentOnlyHost { + credentialsOK = true + attachment = true + } else if r.FormValue("disposition") == "attachment" { + attachment = true + } - if targetId = parseCollectionIdFromDNSName(r.Host); targetId != "" { - // http://ID.dl.example/PATH... + if targetID = parseCollectionIDFromDNSName(r.Host); targetID != "" { + // http://ID.collections.example/PATH... credentialsOK = true targetPath = pathParts } else if len(pathParts) >= 2 && strings.HasPrefix(pathParts[0], "c=") { // /c=ID/PATH... - targetId = parseCollectionIdFromURL(pathParts[0][2:]) + targetID = parseCollectionIDFromURL(pathParts[0][2:]) targetPath = pathParts[1:] } else if len(pathParts) >= 3 && pathParts[0] == "collections" { if len(pathParts) >= 5 && pathParts[1] == "download" { // /collections/download/ID/TOKEN/PATH... - targetId = pathParts[2] + targetID = pathParts[2] tokens = []string{pathParts[3]} targetPath = pathParts[4:] pathToken = true } else { // /collections/ID/PATH... - targetId = pathParts[1] + targetID = pathParts[1] tokens = anonymousTokens targetPath = pathParts[2:] } @@ -124,7 +158,24 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { statusCode = http.StatusNotFound return } - if t := r.FormValue("api_token"); t != "" { + + formToken := r.FormValue("api_token") + if formToken != "" && r.Header.Get("Origin") != "" && attachment && r.URL.Query().Get("api_token") == "" { + // The client provided an explicit token in the POST + // body. The Origin header indicates this *might* be + // an AJAX request, in which case redirect-with-cookie + // won't work: we should just serve the content in the + // POST response. This is safe because: + // + // * We're supplying an attachment, not inline + // content, so we don't need to convert the POST to + // a GET and avoid the "really resubmit form?" + // problem. + // + // * The token isn't embedded in the URL, so we don't + // need to worry about bookmarks and copy/paste. + tokens = append(tokens, formToken) + } else if formToken != "" { // The client provided an explicit token in the query // string, or a form in POST body. We must put the // token in an HttpOnly cookie, and redirect to the @@ -134,7 +185,8 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { if !credentialsOK { // It is not safe to copy the provided token // into a cookie unless the current vhost - // (origin) serves only a single collection. + // (origin) serves only a single collection or + // we are in trustAllContent mode. statusCode = http.StatusBadRequest return } @@ -152,13 +204,22 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { // resulting page. http.SetCookie(w, &http.Cookie{ - Name: "api_token", - Value: auth.EncodeTokenCookie([]byte(t)), + Name: "arvados_api_token", + Value: auth.EncodeTokenCookie([]byte(formToken)), Path: "/", - Expires: time.Now().AddDate(10,0,0), HttpOnly: true, }) - redir := (&url.URL{Host: r.Host, Path: r.URL.Path}).String() + + // Propagate query parameters (except api_token) from + // the original request. + redirQuery := r.URL.Query() + redirQuery.Del("api_token") + + redir := (&url.URL{ + Host: r.Host, + Path: r.URL.Path, + RawQuery: redirQuery.Encode(), + }).String() w.Header().Add("Location", redir) statusCode, statusText = http.StatusSeeOther, redir @@ -190,10 +251,11 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { if len(targetPath) > 0 && targetPath[0] == "_" { // If a collection has a directory called "t=foo" or - // "_", it can be served at //dl.example/_/t=foo/ or - // //dl.example/_/_/ respectively: //dl.example/t=foo/ - // won't work because t=foo will be interpreted as a - // token "foo". + // "_", it can be served at + // //collections.example/_/t=foo/ or + // //collections.example/_/_/ respectively: + // //collections.example/t=foo/ won't work because + // t=foo will be interpreted as a token "foo". targetPath = targetPath[1:] } @@ -201,7 +263,7 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { collection := make(map[string]interface{}) found := false for _, arv.ApiToken = range tokens { - err := arv.Get("collections", targetId, nil, &collection) + err := arv.Get("collections", targetID, nil, &collection) if err == nil { // Success found = true @@ -247,7 +309,7 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { // someone trying (anonymously) to download public // data that has been deleted. Allow a referrer to // provide this context somehow? - w.Header().Add("WWW-Authenticate", "Basic realm=\"dl\"") + w.Header().Add("WWW-Authenticate", "Basic realm=\"collections\"") statusCode = http.StatusUnauthorized return } @@ -268,8 +330,10 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { } defer rdr.Close() - // One or both of these can be -1 if not found: basenamePos := strings.LastIndex(filename, "/") + if basenamePos < 0 { + basenamePos = 0 + } extPos := strings.LastIndex(filename, ".") if extPos > basenamePos { // Now extPos is safely >= 0. @@ -277,11 +341,56 @@ func (h *handler) ServeHTTP(wOrig http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", t) } } - w.Header().Set("Content-Length", fmt.Sprintf("%d", rdr.Len())) + if rdr, ok := rdr.(keepclient.ReadCloserWithLen); ok { + w.Header().Set("Content-Length", fmt.Sprintf("%d", rdr.Len())) + } + + applyContentDispositionHdr(w, r, filename[basenamePos:], attachment) + rangeRdr, statusCode := applyRangeHdr(w, r, rdr) - w.WriteHeader(http.StatusOK) - _, err = io.Copy(w, rdr) + w.WriteHeader(statusCode) + _, err = io.Copy(w, rangeRdr) if err != nil { statusCode, statusText = http.StatusBadGateway, err.Error() } } + +var rangeRe = regexp.MustCompile(`^bytes=0-([0-9]*)$`) + +func applyRangeHdr(w http.ResponseWriter, r *http.Request, rdr keepclient.ReadCloserWithLen) (io.Reader, int) { + w.Header().Set("Accept-Ranges", "bytes") + hdr := r.Header.Get("Range") + fields := rangeRe.FindStringSubmatch(hdr) + if fields == nil { + return rdr, http.StatusOK + } + rangeEnd, err := strconv.ParseInt(fields[1], 10, 64) + if err != nil { + // Empty or too big for int64 == send entire content + return rdr, http.StatusOK + } + if uint64(rangeEnd) >= rdr.Len() { + return rdr, http.StatusOK + } + w.Header().Set("Content-Length", fmt.Sprintf("%d", rangeEnd+1)) + w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", 0, rangeEnd, rdr.Len())) + return &io.LimitedReader{R: rdr, N: rangeEnd + 1}, http.StatusPartialContent +} + +func applyContentDispositionHdr(w http.ResponseWriter, r *http.Request, filename string, isAttachment bool) { + disposition := "inline" + if isAttachment { + disposition = "attachment" + } + if strings.ContainsRune(r.RequestURI, '?') { + // Help the UA realize that the filename is just + // "filename.txt", not + // "filename.txt?disposition=attachment". + // + // TODO(TC): Follow advice at RFC 6266 appendix D + disposition += "; filename=" + strconv.QuoteToASCII(filename) + } + if disposition != "inline" { + w.Header().Set("Content-Disposition", disposition) + } +}