From dc1b9858b880d802cf54d568599607dd65bc3d39 Mon Sep 17 00:00:00 2001 From: "marius a. eriksen" Date: Wed, 13 Nov 2019 12:08:32 -0800 Subject: [PATCH 1/4] support go11x runtimes The old runtimes are no longer supported, and App Engine does not permit creating or updating go1 projects. This change introduces support of the go111 runtime. Newer runtimes no longer support login: handlers. --- README.md | 2 +- app.yaml | 8 +++----- tiddly.go | 44 ++++++++++++++++++++++++++++++-------------- 3 files changed, 34 insertions(+), 20 deletions(-) diff --git a/README.md b/README.md index a11695e..2699356 100644 --- a/README.md +++ b/README.md @@ -40,7 +40,7 @@ tiddler content on demand. Create an Google App Engine standard app and deploy with - appcfg.py -A your-app -V your-version update . + gcloud --project=your-app app deploy Then visit https://your-app.appspot.com/. As noted above, only admins will have access to the content. diff --git a/app.yaml b/app.yaml index 89f56fe..35dbbf4 100644 --- a/app.yaml +++ b/app.yaml @@ -1,10 +1,8 @@ -application: tiddlywiki-gae -version: 2016-12-22 -runtime: go -api_version: go1 +# go112+ doesn't support login: handlers +runtime: go111 handlers: - url: /.* login: admin secure: always - script: _go_app + script: auto diff --git a/tiddly.go b/tiddly.go index 3803576..2e67a1c 100644 --- a/tiddly.go +++ b/tiddly.go @@ -2,7 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -package tiddly +package main import ( "bytes" @@ -10,8 +10,10 @@ import ( "encoding/json" "fmt" "io/ioutil" + "log" "net/http" "net/url" + "os" "strings" "google.golang.org/appengine" @@ -58,15 +60,6 @@ import ( // in the wiki. It seems like the TiddlyWeb plugin or the core syncer module // would need changes to understand a new "read-only" mode. -func init() { - http.HandleFunc("/", authCheck(main)) - http.HandleFunc("/auth", authCheck(auth)) - http.HandleFunc("/status", authCheck(status)) - http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) - http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) - http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) -} - func authCheck(f http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { if !mustBeAdmin(w, r) { @@ -87,12 +80,35 @@ func mustBeAdmin(w http.ResponseWriter, r *http.Request) bool { } type Tiddler struct { - Rev int `datastore:"Rev,noindex"` - Meta string `datastore:"Meta,noindex"` - Text string `datastore:"Text,noindex"` + Rev int `datastore:"Rev,noindex"` + Meta string `datastore:"Meta,noindex"` + Text string `datastore:"Text,noindex"` + Tags []string `datastore:"Tags",noindex` +} + +func main() { + http.HandleFunc("/", authCheck(index)) + http.HandleFunc("/auth", authCheck(auth)) + http.HandleFunc("/status", authCheck(status)) + http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) + http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) + http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) + + port := os.Getenv("PORT") + if port == "" { + port = "8080" + log.Printf("Defaulting to port %s", port) + } + + appengine.Main() + + log.Printf("Listening on port %s", port) + if err := http.ListenAndServe(":"+port, nil); err != nil { + log.Fatal(err) + } } -func main(w http.ResponseWriter, r *http.Request) { +func index(w http.ResponseWriter, r *http.Request) { if r.Method != "GET" { http.Error(w, "bad method", 405) return From 463ba16740c1eb2d9c2da2e1b360be9766abb513 Mon Sep 17 00:00:00 2001 From: "marius a. eriksen" Date: Wed, 13 Nov 2019 12:08:32 -0800 Subject: [PATCH 2/4] support go11x runtimes The old runtimes are no longer supported, and App Engine does not permit creating or updating go1 projects. This change introduces support of the go111 runtime. Newer runtimes no longer support login: handlers. --- README.md | 2 +- app.yaml | 8 +++----- tiddly.go | 44 ++++++++++++++++++++++++++++++-------------- 3 files changed, 34 insertions(+), 20 deletions(-) diff --git a/README.md b/README.md index a213a88..6b6f385 100644 --- a/README.md +++ b/README.md @@ -40,7 +40,7 @@ tiddler content on demand. Create an Google App Engine standard app and deploy with - appcfg.py -A your-app -V your-version update . + gcloud --project=your-app app deploy Then visit https://your-app.appspot.com/. As noted above, only admins will have access to the content. diff --git a/app.yaml b/app.yaml index 89f56fe..35dbbf4 100644 --- a/app.yaml +++ b/app.yaml @@ -1,10 +1,8 @@ -application: tiddlywiki-gae -version: 2016-12-22 -runtime: go -api_version: go1 +# go112+ doesn't support login: handlers +runtime: go111 handlers: - url: /.* login: admin secure: always - script: _go_app + script: auto diff --git a/tiddly.go b/tiddly.go index 3803576..2e67a1c 100644 --- a/tiddly.go +++ b/tiddly.go @@ -2,7 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -package tiddly +package main import ( "bytes" @@ -10,8 +10,10 @@ import ( "encoding/json" "fmt" "io/ioutil" + "log" "net/http" "net/url" + "os" "strings" "google.golang.org/appengine" @@ -58,15 +60,6 @@ import ( // in the wiki. It seems like the TiddlyWeb plugin or the core syncer module // would need changes to understand a new "read-only" mode. -func init() { - http.HandleFunc("/", authCheck(main)) - http.HandleFunc("/auth", authCheck(auth)) - http.HandleFunc("/status", authCheck(status)) - http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) - http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) - http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) -} - func authCheck(f http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { if !mustBeAdmin(w, r) { @@ -87,12 +80,35 @@ func mustBeAdmin(w http.ResponseWriter, r *http.Request) bool { } type Tiddler struct { - Rev int `datastore:"Rev,noindex"` - Meta string `datastore:"Meta,noindex"` - Text string `datastore:"Text,noindex"` + Rev int `datastore:"Rev,noindex"` + Meta string `datastore:"Meta,noindex"` + Text string `datastore:"Text,noindex"` + Tags []string `datastore:"Tags",noindex` +} + +func main() { + http.HandleFunc("/", authCheck(index)) + http.HandleFunc("/auth", authCheck(auth)) + http.HandleFunc("/status", authCheck(status)) + http.HandleFunc("/recipes/all/tiddlers/", authCheck(tiddler)) + http.HandleFunc("/recipes/all/tiddlers.json", authCheck(tiddlerList)) + http.HandleFunc("/bags/bag/tiddlers/", authCheck(deleteTiddler)) + + port := os.Getenv("PORT") + if port == "" { + port = "8080" + log.Printf("Defaulting to port %s", port) + } + + appengine.Main() + + log.Printf("Listening on port %s", port) + if err := http.ListenAndServe(":"+port, nil); err != nil { + log.Fatal(err) + } } -func main(w http.ResponseWriter, r *http.Request) { +func index(w http.ResponseWriter, r *http.Request) { if r.Method != "GET" { http.Error(w, "bad method", 405) return From 5f2ed2fdd84534a359ab1f2def8fc6b2a7f6315e Mon Sep 17 00:00:00 2001 From: "marius a. eriksen" Date: Thu, 14 Nov 2019 10:23:48 -0800 Subject: [PATCH 3/4] fix quoting of Tiddler tag --- tiddly.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tiddly.go b/tiddly.go index 2e67a1c..f23229b 100644 --- a/tiddly.go +++ b/tiddly.go @@ -83,7 +83,7 @@ type Tiddler struct { Rev int `datastore:"Rev,noindex"` Meta string `datastore:"Meta,noindex"` Text string `datastore:"Text,noindex"` - Tags []string `datastore:"Tags",noindex` + Tags []string `datastore:"Tags,noindex"` } func main() { From b5e1bd0702e1edcd06a61a33f65e878244e5a763 Mon Sep 17 00:00:00 2001 From: Brandon Philips Date: Thu, 28 May 2020 11:40:02 -0700 Subject: [PATCH 4/4] tiddly: update to use Google IAP This updates the tiddly to use Google IAP instead of the simpler, and sadly deprecated, app.yaml access control. Tested and deployed on memex.ifup.org. Try to break in! :) --- .gcloudignore | 25 +++++ README.md | 13 +-- app.yaml | 3 +- go.mod | 9 ++ go.sum | 288 ++++++++++++++++++++++++++++++++++++++++++++++++++ googleiap.go | 138 ++++++++++++++++++++++++ tiddly.go | 54 ++-------- 7 files changed, 477 insertions(+), 53 deletions(-) create mode 100644 .gcloudignore create mode 100644 go.mod create mode 100644 go.sum create mode 100644 googleiap.go diff --git a/.gcloudignore b/.gcloudignore new file mode 100644 index 0000000..199e6d9 --- /dev/null +++ b/.gcloudignore @@ -0,0 +1,25 @@ +# This file specifies files that are *not* uploaded to Google Cloud Platform +# using gcloud. It follows the same syntax as .gitignore, with the addition of +# "#!include" directives (which insert the entries of the given .gitignore-style +# file at that point). +# +# For more information, run: +# $ gcloud topic gcloudignore +# +.gcloudignore +# If you would like to upload your .git directory, .gitignore file or files +# from your .gitignore file, remove the corresponding line +# below: +.git +.gitignore + +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib +# Test binary, build with `go test -c` +*.test +# Output of the go coverage tool, specifically when used with LiteIDE +*.out \ No newline at end of file diff --git a/README.md b/README.md index 6b6f385..b5b3ccc 100644 --- a/README.md +++ b/README.md @@ -16,12 +16,14 @@ appropriately to the (relatively few) needed JSON API calls. The TiddlyWeb JSON API envisions a multiuser system in which different users have access to different sets of tiddlers. This Go server contains none of that: it assumes that all users have full access to everything, although it does record -who created which tiddlers. The only access control is that the app.yaml here -requires HTTPS and administrator login for all URLs, and as a “belt and suspenders” measure, -the app itself also refuses to serve to non-admins, as checked by user.IsAdmin. +who created which tiddlers. -See the "Re Authentication" comment in tiddly.go for information about -making the server publicly read-only (it's not quite perfect). +Authentication is controlled by [Google IAP][iap] as a “belt and suspenders” +measure. When deploying the application you will need to enable and [configure +IAP][configure-iap] with the addresses you want to have access. + +[iap]: https://cloud.google.com/go/getting-started/authenticate-users-with-iap +[configure-iap]: https://cloud.google.com/go/getting-started/authenticate-users-with-iap ## Data model @@ -97,4 +99,3 @@ The process for preparing a new index.html is: - Open the downloaded file in the web browser. - Repeat, adding any more plugins. - Copy the final download to index.html. - diff --git a/app.yaml b/app.yaml index 35dbbf4..f5e781f 100644 --- a/app.yaml +++ b/app.yaml @@ -1,5 +1,4 @@ -# go112+ doesn't support login: handlers -runtime: go111 +runtime: go113 handlers: - url: /.* diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..e5410ae --- /dev/null +++ b/go.mod @@ -0,0 +1,9 @@ +module github.com/philips/tiddly + +go 1.14 + +require ( + cloud.google.com/go v0.57.0 + github.com/dgrijalva/jwt-go v3.2.0+incompatible + google.golang.org/appengine 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+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/googleiap.go b/googleiap.go new file mode 100644 index 0000000..078e733 --- /dev/null +++ b/googleiap.go @@ -0,0 +1,138 @@ +// Copyright 2019 Google LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package main + +import ( + "encoding/json" + "fmt" + "log" + "net/http" + "time" + + "cloud.google.com/go/compute/metadata" + "github.com/dgrijalva/jwt-go" +) + +// the functions in this file are copied, with light modification to fit this +// application, from Google's IAP example application: +// https://raw.githubusercontent.com/GoogleCloudPlatform/golang-samples/95634648f8e9140844db8af8244130491457e251/getting-started/authenticating-users/main.go + +// iap holds the Cloud IAP certificates and audience field for this app, which +// are needed to verify authentication headers set by Cloud IAP. +type iap struct { + certs map[string]string + aud string +} + +// newIAP creates a new iap, returning an error if either the Cloud IAP +// certificates or audience field cannot be obtained. +func newIAP() (*iap, error) { + certs, err := certificates() + if err != nil { + return nil, err + } + + aud, err := audience() + if err != nil { + return nil, err + } + + a := &iap{ + certs: certs, + aud: aud, + } + return a, nil +} + +func (i *iap) Email(r *http.Request) (string, bool) { + assertion := r.Header.Get("X-Goog-IAP-JWT-Assertion") + if assertion == "" { + log.Fatal("No Cloud IAP header found.") + return "", false + } + + email, _, err := validateAssertion(assertion, i.certs, i.aud) + if err != nil { + log.Println("Could not validate assertion. Check app logs.") + return "", false + } + + return email, true +} + +// audience returns the expected audience value for this service. +func audience() (string, error) { + projectNumber, err := metadata.NumericProjectID() + if err != nil { + return "", fmt.Errorf("metadata.NumericProjectID: %v", err) + } + + projectID, err := metadata.ProjectID() + if err != nil { + return "", fmt.Errorf("metadata.ProjectID: %v", err) + } + + return "/projects/" + projectNumber + "/apps/" + projectID, nil +} + +// certificates returns Cloud IAP's cryptographic public keys. +func certificates() (map[string]string, error) { + const url = "https://www.gstatic.com/iap/verify/public_key" + client := http.Client{ + Timeout: 5 * time.Second, + } + resp, err := client.Get(url) + if err != nil { + return nil, fmt.Errorf("Get: %v", err) + } + + var certs map[string]string + dec := json.NewDecoder(resp.Body) + if err := dec.Decode(&certs); err != nil { + return nil, fmt.Errorf("Decode: %v", err) + } + + return certs, nil +} + +// validateAssertion validates assertion was signed by Google and returns the +// associated email and userID. +func validateAssertion(assertion string, certs map[string]string, aud string) (email string, userID string, err error) { + token, err := jwt.Parse(assertion, func(token *jwt.Token) (interface{}, error) { + keyID := token.Header["kid"].(string) + + _, ok := token.Method.(*jwt.SigningMethodECDSA) + if !ok { + return nil, fmt.Errorf("unexpected signing method: %q", token.Header["alg"]) + } + + cert := certs[keyID] + return jwt.ParseECPublicKeyFromPEM([]byte(cert)) + }) + + if err != nil { + return "", "", err + } + + claims, ok := token.Claims.(jwt.MapClaims) + if !ok { + return "", "", fmt.Errorf("could not extract claims (%T): %+v", token.Claims, token.Claims) + } + + if claims["aud"].(string) != aud { + return "", "", fmt.Errorf("mismatched audience. aud field %q does not match %q", claims["aud"], aud) + } + return claims["email"].(string), claims["sub"].(string), nil +} diff --git a/tiddly.go b/tiddly.go index f23229b..9d88ff3 100644 --- a/tiddly.go +++ b/tiddly.go @@ -21,44 +21,7 @@ import ( "google.golang.org/appengine/user" ) -// Re Authentication -// -// There are currently three redundant layers of authentication checks here. -// -// 1. app.yaml says 'login: admin'. -// 2. The installed handlers are wrapped in authCheck during registration in func init. -// 3. The write operations contain an extra mustBeAdmin check. -// -// The redundancy is mainly cautionary, to contain accidents. -// -// It should be possible to make a world-readable, admin-writable TiddlyWiki -// by removing 1 and 2 and double-checking 3. -// -// If you remove 'login: admin' from app.yaml you can replace it with 'login: required', -// requiring a login from any viewer, or you can delete the line entirely, -// making it possible to fetch pages with no authentication. -// In that case, users who do have write access (admins) will need to take the extra -// step of logging in. One way to do this is to make the /auth URL require login -// and have them start there when visiting, by listing that separately in app.yaml -// before the default handler: -// -// handlers: -// - url: /auth -// login: admin -// secure: always -// script: _go_app -// -// - url: /.* -// secure: always -// script: _go_app -// -// If you do this, then unauthenticated users will be able to read content, -// and TiddlyWiki will let them edit content in their browser, but writes back -// to the server will fail, producing yellow pop-up error messages in the -// browser window. In general these are probably good, but this includes -// attempts to update $:/StoryList, which happens as viewers click around -// in the wiki. It seems like the TiddlyWeb plugin or the core syncer module -// would need changes to understand a new "read-only" mode. +var tiddlyIAP *iap func authCheck(f http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { @@ -70,13 +33,8 @@ func authCheck(f http.HandlerFunc) http.HandlerFunc { } func mustBeAdmin(w http.ResponseWriter, r *http.Request) bool { - ctx := appengine.NewContext(r) - u := user.Current(ctx) - if u == nil || !user.IsAdmin(ctx) { - http.Error(w, "permission denied", 403) - return false - } - return true + _, ok := tiddlyIAP.Email(r) + return ok } type Tiddler struct { @@ -87,6 +45,12 @@ type Tiddler struct { } func main() { + var err error + tiddlyIAP, err = newIAP() + if err != nil { + log.Fatal(err) + } + http.HandleFunc("/", authCheck(index)) http.HandleFunc("/auth", authCheck(auth)) http.HandleFunc("/status", authCheck(status))