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trapauth.go
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trapauth.go
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package trapauth
import (
"errors"
"fmt"
"net/http"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/golang-jwt/jwt/v5"
"go.uber.org/zap"
)
const (
typeSoft = iota
typeHard
)
var (
_ caddy.Provisioner = (*Middleware)(nil)
_ caddyhttp.MiddlewareHandler = (*Middleware)(nil)
_ caddyfile.Unmarshaler = (*Middleware)(nil)
)
func init() {
caddy.RegisterModule(Middleware{})
httpcaddyfile.RegisterHandlerDirective("trapauth", parseCaddyfile)
}
type Middleware struct {
Redirect string `json:"redirect,omitempty"`
TokenSource string `json:"token_source,omitempty"`
SourceKey string `json:"source_key,omitempty"`
AuthType string `json:"auth_type,omitempty"`
UserHeader string `json:"user_header,omitempty"`
EmailHeader string `json:"email_header,omitempty"`
FullNameHeader string `json:"full_name_header,omitempty"`
NoStrip bool `json:"no_strip,omitempty"`
AcceptUser []string `json:"accept_user,omitempty"`
InvalidateToken []string `json:"invalidate_token,omitempty"`
at int
ts tokenSource
}
func (Middleware) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.trapauth",
New: func() caddy.Module {
return &Middleware{
AuthType: "hard",
UserHeader: "X-Showcase-User",
TokenSource: "cookie",
SourceKey: "traP_token",
}
},
}
}
func (m *Middleware) Provision(ctx caddy.Context) error {
switch strings.ToLower(m.AuthType) {
case "hard":
m.at = typeHard
case "soft":
m.at = typeSoft
default:
return fmt.Errorf("unsupported auth type: %s", m.AuthType)
}
switch strings.ToLower(m.TokenSource) {
case "header":
m.ts = &headerTokenSource{}
case "cookie":
if len(m.SourceKey) == 0 {
return fmt.Errorf("cookie key is required")
}
m.ts = &cookieTokenSource{cookieName: m.SourceKey}
default:
return fmt.Errorf("unsupported token source: %s", m.TokenSource)
}
ctx.Logger(m).Info("traP authentication plugin is ready", zap.Any("config", m))
return nil
}
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var m Middleware
err := m.UnmarshalCaddyfile(h.Dispenser)
return m, err
}
func (m *Middleware) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
for d.Next() {
args := d.RemainingArgs()
switch len(args) {
case 0:
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "redirect":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.Redirect = args[0]
case "token_source":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.TokenSource = args[0]
case "source_key":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.SourceKey = args[0]
case "type":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.AuthType = args[0]
case "user_header":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.UserHeader = args[0]
case "email_header":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.EmailHeader = args[0]
case "full_name_header":
args := d.RemainingArgs()
if len(args) != 1 {
return d.ArgErr()
}
m.FullNameHeader = args[0]
case "no_strip":
m.NoStrip = true
case "accept_user":
m.AcceptUser = d.RemainingArgs()
case "invalidate_token":
m.InvalidateToken = d.RemainingArgs()
}
}
default:
return d.ArgErr()
}
}
return nil
}
func (m Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
// Strip headers to avoid impersonation
r.Header.Del(m.UserHeader)
if len(m.EmailHeader) > 0 {
r.Header.Del(m.EmailHeader)
}
if len(m.FullNameHeader) > 0 {
r.Header.Del(m.FullNameHeader)
}
// Extract traP token from either Cookie or Authorization header
tokenString := m.ts.ExtractToken(r)
if len(tokenString) == 0 {
return m.unauthorized(w, r, next)
}
// jwtのライブラリの実装によっては、仕様では許可されていないbase64のパディング(`=`)が
// 付与されている場合があるので注意すること
// jwt-goのv3.2.2以降ではパディングが付与されているものは、
// デコードできないようになっているので、
// ここでは特に処理をする必要はない
// see https://wiki.trap.jp/SysAd/ops/2021-11-14
if contains(m.InvalidateToken, tokenString) {
return m.unauthorized(w, r, next)
}
// Parse JWT
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (i interface{}, e error) {
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, errors.New("invalid token")
}
return pubkey, nil
})
if err != nil || !token.Valid {
return m.unauthorized(w, r, next)
}
// Strip traP token from Cookie or Authorization header
if !m.NoStrip {
m.ts.StripToken(r)
}
// Extract claims
claims := token.Claims.(jwt.MapClaims)
// Set traP ID
{
// Extract from either "id" or "name" claim
id, ok := claims["id"].(string)
if !ok {
id, ok = claims["name"].(string)
}
if !ok {
return m.unauthorized(w, r, next)
}
// Check accepted user
if len(m.AcceptUser) > 0 {
isAccepted := contains(m.AcceptUser, id)
if !isAccepted {
return m.unauthorized(w, r, next)
}
}
r.Header.Set(m.UserHeader, id)
}
// Set email
if len(m.EmailHeader) > 0 {
email, ok := claims["email"].(string)
if !ok {
return m.unauthorized(w, r, next)
}
r.Header.Set(m.EmailHeader, email)
}
// Set full name
if len(m.FullNameHeader) > 0 {
firstName, ok := claims["firstName"].(string)
if !ok {
return m.unauthorized(w, r, next)
}
lastName, ok := claims["lastName"].(string)
if !ok {
return m.unauthorized(w, r, next)
}
fullName := firstName + " " + lastName
r.Header.Set(m.FullNameHeader, fullName)
}
return next.ServeHTTP(w, r)
}
func (m *Middleware) unauthorized(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
if m.at == typeSoft {
r.Header.Set(m.UserHeader, "-")
return next.ServeHTTP(w, r)
}
if len(m.Redirect) > 0 {
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
http.Redirect(w, r, repl.ReplaceAll(m.Redirect, ""), http.StatusSeeOther)
return nil
}
return caddyhttp.Error(http.StatusUnauthorized, fmt.Errorf("not authenticated"))
}
func contains(strArr []string, str string) bool {
for _, s := range strArr {
if str == s {
return true
}
}
return false
}