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Add CSRF protection to state-changing POST endpoints

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Add gorilla/csrf middleware to protect all HTML-serving routes against
cross-site request forgery attacks. The webhook endpoint is excluded
since it uses secret-based authentication.

Changes:
- Add gorilla/csrf v1.7.3 dependency
- Add CSRF() middleware method using session secret as key
- Apply CSRF middleware to all HTML route groups in routes.go
- Pass CSRF token to all templates via addGlobals helper
- Add {{ .CSRFField }} / {{ $.CSRFField }} hidden inputs to all forms

Closes #11
This commit is contained in:
clawbot 2026-02-15 14:17:55 -08:00
parent d4eae284b5
commit b1dc8fcc4e
17 changed files with 77 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
go.mod
View File

@ -5,9 +5,11 @@ go 1.25
require (
github.com/99designs/basicauth-go v0.0.0-20230316000542-bf6f9cbbf0f8
github.com/docker/docker v27.3.1+incompatible
github.com/docker/go-connections v0.6.0
github.com/go-chi/chi/v5 v5.2.3
github.com/go-chi/cors v1.2.2
github.com/google/uuid v1.6.0
github.com/gorilla/csrf v1.7.3
github.com/gorilla/sessions v1.4.0
github.com/joho/godotenv v1.5.1
github.com/mattn/go-sqlite3 v1.14.32
@ -27,7 +29,6 @@ require (
github.com/containerd/log v0.1.0 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/distribution/reference v0.6.0 // indirect
github.com/docker/go-connections v0.6.0 // indirect
github.com/docker/go-units v0.5.0 // indirect
github.com/felixge/httpsnoop v1.0.4 // indirect
github.com/fsnotify/fsnotify v1.9.0 // indirect

2
go.sum
View File

@ -50,6 +50,8 @@ github.com/google/gofuzz v1.2.0 h1:xRy4A+RhZaiKjJ1bPfwQ8sedCA+YS2YcCHW6ec7JMi0=
github.com/google/gofuzz v1.2.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/gorilla/csrf v1.7.3 h1:BHWt6FTLZAb2HtWT5KDBf6qgpZzvtbp9QWDRKZMXJC0=
github.com/gorilla/csrf v1.7.3/go.mod h1:F1Fj3KG23WYHE6gozCmBAezKookxbIvUJT+121wTuLk=
github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kXD8ePA=
github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
github.com/gorilla/sessions v1.4.0 h1:kpIYOp/oi6MG/p5PgxApU8srsSw9tuFbt46Lt7auzqQ=

18
internal/handlers/app.go
View File

@ -29,8 +29,8 @@ const (
func (h *Handlers) HandleAppNew() http.HandlerFunc {
tmpl := templates.GetParsed()
return func(writer http.ResponseWriter, _ *http.Request) {
data := h.addGlobals(map[string]any{})
return func(writer http.ResponseWriter, request *http.Request) {
data := h.addGlobals(map[string]any{}, request)
err := tmpl.ExecuteTemplate(writer, "app_new.html", data)
if err != nil {
@ -57,12 +57,12 @@ func (h *Handlers) HandleAppCreate() http.HandlerFunc {
branch := request.FormValue("branch")
dockerfilePath := request.FormValue("dockerfile_path")
data := map[string]any{
data := h.addGlobals(map[string]any{
"Name": name,
"RepoURL": repoURL,
"Branch": branch,
"DockerfilePath": dockerfilePath,
}
}, request)
if name == "" || repoURL == "" {
data["Error"] = "Name and repository URL are required"
@ -150,7 +150,7 @@ func (h *Handlers) HandleAppDetail() http.HandlerFunc {
"WebhookURL": webhookURL,
"DeployKey": deployKey,
"Success": request.URL.Query().Get("success"),
})
}, request)
err := tmpl.ExecuteTemplate(writer, "app_detail.html", data)
if err != nil {
@ -183,7 +183,7 @@ func (h *Handlers) HandleAppEdit() http.HandlerFunc {
data := h.addGlobals(map[string]any{
"App": application,
})
}, request)
err := tmpl.ExecuteTemplate(writer, "app_edit.html", data)
if err != nil {
@ -241,10 +241,10 @@ func (h *Handlers) HandleAppUpdate() http.HandlerFunc {
if saveErr != nil {
h.log.Error("failed to update app", "error", saveErr)
data := map[string]any{
data := h.addGlobals(map[string]any{
"App": application,
"Error": "Failed to update app",
}
}, request)
_ = tmpl.ExecuteTemplate(writer, "app_edit.html", data)
return
@ -337,7 +337,7 @@ func (h *Handlers) HandleAppDeployments() http.HandlerFunc {
data := h.addGlobals(map[string]any{
"App": application,
"Deployments": deployments,
})
}, request)
err := tmpl.ExecuteTemplate(writer, "deployments.html", data)
if err != nil {

6
internal/handlers/auth.go
View File

@ -10,8 +10,8 @@ import (
func (h *Handlers) HandleLoginGET() http.HandlerFunc {
tmpl := templates.GetParsed()
return func(writer http.ResponseWriter, _ *http.Request) {
data := h.addGlobals(map[string]any{})
return func(writer http.ResponseWriter, request *http.Request) {
data := h.addGlobals(map[string]any{}, request)
err := tmpl.ExecuteTemplate(writer, "login.html", data)
if err != nil {
@ -38,7 +38,7 @@ func (h *Handlers) HandleLoginPOST() http.HandlerFunc {
data := h.addGlobals(map[string]any{
"Username": username,
})
}, request)
if username == "" || password == "" {
data["Error"] = "Username and password are required"

2
internal/handlers/dashboard.go
View File

@ -67,7 +67,7 @@ func (h *Handlers) HandleDashboard() http.HandlerFunc {
data := h.addGlobals(map[string]any{
"AppStats": appStats,
})
}, request)
execErr := tmpl.ExecuteTemplate(writer, "dashboard.html", data)
if execErr != nil {

13
internal/handlers/handlers.go
View File

@ -3,9 +3,11 @@ package handlers
import (
"encoding/json"
"html/template"
"log/slog"
"net/http"
"github.com/gorilla/csrf"
"go.uber.org/fx"
"git.eeqj.de/sneak/upaas/internal/database"
@ -64,11 +66,18 @@ func New(_ fx.Lifecycle, params Params) (*Handlers, error) {
}, nil
}
// addGlobals adds version info to template data map.
func (h *Handlers) addGlobals(data map[string]any) map[string]any {
// addGlobals adds version info and CSRF token to template data map.
func (h *Handlers) addGlobals(
data map[string]any,
request *http.Request,
) map[string]any {
data["Version"] = h.globals.Version
data["Appname"] = h.globals.Appname
if request != nil {
data["CSRFField"] = template.HTML(csrf.TemplateField(request)) //nolint:gosec // csrf.TemplateField produces safe HTML
}
return data
}

12
internal/handlers/setup.go
View File

@ -15,8 +15,8 @@ const (
func (h *Handlers) HandleSetupGET() http.HandlerFunc {
tmpl := templates.GetParsed()
return func(writer http.ResponseWriter, _ *http.Request) {
data := h.addGlobals(map[string]any{})
return func(writer http.ResponseWriter, request *http.Request) {
data := h.addGlobals(map[string]any{}, request)
err := tmpl.ExecuteTemplate(writer, "setup.html", data)
if err != nil {
@ -54,13 +54,14 @@ func validateSetupForm(formData setupFormData) string {
func (h *Handlers) renderSetupError(
tmpl *templates.TemplateExecutor,
writer http.ResponseWriter,
request *http.Request,
username string,
errorMsg string,
) {
data := h.addGlobals(map[string]any{
"Username": username,
"Error": errorMsg,
})
}, request)
_ = tmpl.ExecuteTemplate(writer, "setup.html", data)
}
@ -83,7 +84,7 @@ func (h *Handlers) HandleSetupPOST() http.HandlerFunc {
}
if validationErr := validateSetupForm(formData); validationErr != "" {
h.renderSetupError(tmpl, writer, formData.username, validationErr)
h.renderSetupError(tmpl, writer, request, formData.username, validationErr)
return
}
@ -95,7 +96,7 @@ func (h *Handlers) HandleSetupPOST() http.HandlerFunc {
)
if createErr != nil {
h.log.Error("failed to create user", "error", createErr)
h.renderSetupError(tmpl, writer, formData.username, "Failed to create user")
h.renderSetupError(tmpl, writer, request, formData.username, "Failed to create user")
return
}
@ -106,6 +107,7 @@ func (h *Handlers) HandleSetupPOST() http.HandlerFunc {
h.renderSetupError(
tmpl,
writer,
request,
formData.username,
"Failed to create session",
)

10
internal/middleware/middleware.go
View File

@ -10,6 +10,7 @@ import (
"github.com/99designs/basicauth-go"
"github.com/go-chi/chi/v5/middleware"
"github.com/go-chi/cors"
"github.com/gorilla/csrf"
"go.uber.org/fx"
"git.eeqj.de/sneak/upaas/internal/config"
@ -152,6 +153,15 @@ func (m *Middleware) SessionAuth() func(http.Handler) http.Handler {
}
}
// CSRF returns CSRF protection middleware using gorilla/csrf.
func (m *Middleware) CSRF() func(http.Handler) http.Handler {
return csrf.Protect(
[]byte(m.params.Config.SessionSecret),
csrf.Secure(false), // Allow HTTP for development; reverse proxy handles TLS
csrf.Path("/"),
)
}
// SetupRequired returns middleware that redirects to setup if no user exists.
func (m *Middleware) SetupRequired() func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {

23
internal/server/routes.go
View File

@ -37,18 +37,22 @@ func (s *Server) SetupRoutes() {
http.FileServer(http.FS(static.Static)),
))
// Public routes
s.router.Get("/login", s.handlers.HandleLoginGET())
s.router.Post("/login", s.handlers.HandleLoginPOST())
s.router.Get("/setup", s.handlers.HandleSetupGET())
s.router.Post("/setup", s.handlers.HandleSetupPOST())
// Webhook endpoint (uses secret for auth, not session)
// Webhook endpoint (uses secret for auth, not session — no CSRF)
s.router.Post("/webhook/{secret}", s.handlers.HandleWebhook())
// Protected routes (require session auth)
// All HTML-serving routes get CSRF protection
s.router.Group(func(r chi.Router) {
r.Use(s.mw.SessionAuth())
r.Use(s.mw.CSRF())
// Public routes
r.Get("/login", s.handlers.HandleLoginGET())
r.Post("/login", s.handlers.HandleLoginPOST())
r.Get("/setup", s.handlers.HandleSetupGET())
r.Post("/setup", s.handlers.HandleSetupPOST())
// Protected routes (require session auth)
r.Group(func(r chi.Router) {
r.Use(s.mw.SessionAuth())
// Dashboard
r.Get("/", s.handlers.HandleDashboard())
@ -90,6 +94,7 @@ func (s *Server) SetupRoutes() {
// Ports
r.Post("/apps/{id}/ports", s.handlers.HandlePortAdd())
r.Post("/apps/{id}/ports/{portID}/delete", s.handlers.HandlePortDelete())
})
})
// Metrics endpoint (optional, with basic auth)

10
templates/app_detail.html
View File

@ -35,6 +35,7 @@
<div class="flex gap-3">
<a href="/apps/{{.App.ID}}/edit" class="btn-secondary">Edit</a>
<form method="POST" action="/apps/{{.App.ID}}/deploy" class="inline" @submit="submitDeploy()">
{{ .CSRFField }}
<button type="submit" class="btn-success" x-bind:disabled="deploying" x-bind:class="{ 'opacity-50 cursor-not-allowed': deploying }">
<span x-text="deploying ? 'Deploying...' : 'Deploy Now'"></span>
</button>
@ -106,6 +107,7 @@
<td class="font-mono text-gray-500">{{.Value}}</td>
<td class="text-right">
<form method="POST" action="/apps/{{$.App.ID}}/env/{{.ID}}/delete" class="inline" x-data="confirmAction('Delete this environment variable?')" @submit="confirm($event)">
{{ .CSRFField }}
<button type="submit" class="text-error-500 hover:text-error-700 text-sm">Delete</button>
</form>
</td>
@ -116,6 +118,7 @@
</div>
{{end}}
<form method="POST" action="/apps/{{.App.ID}}/env" class="flex flex-col sm:flex-row gap-2">
{{ .CSRFField }}
<input type="text" name="key" placeholder="KEY" required class="input flex-1 font-mono text-sm">
<input type="text" name="value" placeholder="value" required class="input flex-1 font-mono text-sm">
<button type="submit" class="btn-primary">Add</button>
@ -149,6 +152,7 @@
<td class="font-mono text-gray-500">{{.Value}}</td>
<td class="text-right">
<form method="POST" action="/apps/{{$.App.ID}}/labels/{{.ID}}/delete" class="inline" x-data="confirmAction('Delete this label?')" @submit="confirm($event)">
{{ .CSRFField }}
<button type="submit" class="text-error-500 hover:text-error-700 text-sm">Delete</button>
</form>
</td>
@ -158,6 +162,7 @@
</table>
</div>
<form method="POST" action="/apps/{{.App.ID}}/labels" class="flex flex-col sm:flex-row gap-2">
{{ .CSRFField }}
<input type="text" name="key" placeholder="label.key" required class="input flex-1 font-mono text-sm">
<input type="text" name="value" placeholder="value" required class="input flex-1 font-mono text-sm">
<button type="submit" class="btn-primary">Add</button>
@ -192,6 +197,7 @@
</td>
<td class="text-right">
<form method="POST" action="/apps/{{$.App.ID}}/volumes/{{.ID}}/delete" class="inline" x-data="confirmAction('Delete this volume mount?')" @submit="confirm($event)">
{{ .CSRFField }}
<button type="submit" class="text-error-500 hover:text-error-700 text-sm">Delete</button>
</form>
</td>
@ -202,6 +208,7 @@
</div>
{{end}}
<form method="POST" action="/apps/{{.App.ID}}/volumes" class="flex flex-col sm:flex-row gap-2 items-end">
{{ .CSRFField }}
<div class="flex-1 w-full">
<input type="text" name="host_path" placeholder="/host/path" required class="input font-mono text-sm">
</div>
@ -244,6 +251,7 @@
</td>
<td class="text-right">
<form method="POST" action="/apps/{{$.App.ID}}/ports/{{.ID}}/delete" class="inline" x-data="confirmAction('Delete this port mapping?')" @submit="confirm($event)">
{{ .CSRFField }}
<button type="submit" class="text-error-500 hover:text-error-700 text-sm">Delete</button>
</form>
</td>
@ -254,6 +262,7 @@
</div>
{{end}}
<form method="POST" action="/apps/{{.App.ID}}/ports" class="flex flex-col sm:flex-row gap-2 items-end">
{{ .CSRFField }}
<div class="flex-1 w-full">
<label class="block text-xs text-gray-500 mb-1">Host (external)</label>
<input type="text" name="host_port" placeholder="8080" required pattern="[0-9]+" class="input font-mono text-sm">
@ -339,6 +348,7 @@
<h2 class="text-lg font-medium text-error-700 mb-4">Danger Zone</h2>
<p class="text-error-600 text-sm mb-4">Deleting this app will remove all configuration and deployment history. This action cannot be undone.</p>
<form method="POST" action="/apps/{{.App.ID}}/delete" x-data="confirmAction('Are you sure you want to delete this app? This action cannot be undone.')" @submit="confirm($event)">
{{ .CSRFField }}
<button type="submit" class="btn-danger">Delete App</button>
</form>
</div>

1
templates/app_edit.html
View File

@ -21,6 +21,7 @@
{{template "alert-error" .}}
<form method="POST" action="/apps/{{.App.ID}}" class="space-y-6">
{{ .CSRFField }}
<div class="form-group">
<label for="name" class="label">App Name</label>
<input

1
templates/app_new.html
View File

@ -21,6 +21,7 @@
{{template "alert-error" .}}
<form method="POST" action="/apps" class="space-y-6">
{{ .CSRFField }}
<div class="form-group">
<label for="name" class="label">App Name</label>
<input

1
templates/base.html
View File

@ -32,6 +32,7 @@
New App
</a>
<form method="POST" action="/logout" class="inline">
{{ .CSRFField }}
<button type="submit" class="btn-text">Logout</button>
</form>
</div>

1
templates/dashboard.html
View File

@ -69,6 +69,7 @@
<a href="/apps/{{.App.ID}}" class="btn-text text-sm py-1 px-2">View</a>
<a href="/apps/{{.App.ID}}/edit" class="btn-secondary text-sm py-1 px-2">Edit</a>
<form method="POST" action="/apps/{{.App.ID}}/deploy" class="inline">
{{ .CSRFField }}
<button type="submit" class="btn-success text-sm py-1 px-2">Deploy</button>
</form>
</div>

2
templates/deployments.html
View File

@ -18,6 +18,7 @@
<div class="section-header">
<h1 class="text-2xl font-medium text-gray-900">Deployment History</h1>
<form method="POST" action="/apps/{{.App.ID}}/deploy" @submit="submitDeploy()">
{{ .CSRFField }}
<button type="submit" class="btn-success" x-bind:disabled="isDeploying" x-bind:class="{ 'opacity-50 cursor-not-allowed': isDeploying }">
<span x-text="isDeploying ? 'Deploying...' : 'Deploy Now'"></span>
</button>
@ -103,6 +104,7 @@
<p class="empty-state-description">Deploy your application to see the deployment history here.</p>
<div class="mt-6">
<form method="POST" action="/apps/{{.App.ID}}/deploy" @submit="submitDeploy()">
{{ .CSRFField }}
<button type="submit" class="btn-success" x-bind:disabled="isDeploying" x-bind:class="{ 'opacity-50 cursor-not-allowed': isDeploying }">
<span x-text="isDeploying ? 'Deploying...' : 'Deploy Now'"></span>
</button>

1
templates/login.html
View File

@ -14,6 +14,7 @@
{{template "alert-error" .}}
<form method="POST" action="/login" class="space-y-6">
{{ .CSRFField }}
<div class="form-group">
<label for="username" class="label">Username</label>
<input

1
templates/setup.html
View File

@ -14,6 +14,7 @@
{{template "alert-error" .}}
<form method="POST" action="/setup" class="space-y-6">
{{ .CSRFField }}
<div class="form-group">
<label for="username" class="label">Username</label>
<input