mirror of
https://github.com/woodpecker-ci/woodpecker.git
synced 2024-11-23 02:11:01 +00:00
203 lines
4.8 KiB
Go
203 lines
4.8 KiB
Go
// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package token
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import (
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"fmt"
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"net/http"
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"github.com/golang-jwt/jwt/v5"
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"github.com/rs/zerolog/log"
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)
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type SecretFunc func(*Token) (string, error)
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type Type string
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const (
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UserToken Type = "user" // user token (exp cli)
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SessToken Type = "sess" // session token (ui token requires csrf check)
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HookToken Type = "hook" // repo hook token
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CsrfToken Type = "csrf"
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AgentToken Type = "agent"
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OAuthStateToken Type = "oauth-state"
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)
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// SignerAlgo id default algorithm used to sign JWT tokens.
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const SignerAlgo = "HS256"
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type Token struct {
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Type Type
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claims jwt.MapClaims
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}
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func Parse(allowedTypes []Type, raw string, fn SecretFunc) (*Token, error) {
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token := &Token{
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claims: jwt.MapClaims{},
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}
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parsed, err := jwt.Parse(raw, keyFunc(token, fn))
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if err != nil {
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return nil, err
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}
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if !parsed.Valid {
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return nil, jwt.ErrTokenUnverifiable
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}
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hasAllowedType := false
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for _, k := range allowedTypes {
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if k == token.Type {
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hasAllowedType = true
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break
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}
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}
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if !hasAllowedType {
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return nil, jwt.ErrInvalidType
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}
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return token, nil
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}
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func ParseRequest(allowedTypes []Type, r *http.Request, fn SecretFunc) (*Token, error) {
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// first we attempt to get the token from the
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// authorization header.
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token := r.Header.Get("Authorization")
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if len(token) != 0 {
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log.Trace().Msgf("token.ParseRequest: found token in header: %s", token)
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bearer := token
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if _, err := fmt.Sscanf(token, "Bearer %s", &bearer); err != nil {
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return nil, err
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}
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return Parse(allowedTypes, bearer, fn)
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}
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token = r.Header.Get("X-Gitlab-Token")
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if len(token) != 0 {
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return Parse(allowedTypes, token, fn)
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}
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// then we attempt to get the token from the
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// access_token url query parameter
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token = r.FormValue("access_token")
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if len(token) != 0 {
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return Parse(allowedTypes, token, fn)
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}
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// and finally we attempt to get the token from
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// the user session cookie
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cookie, err := r.Cookie("user_sess")
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if err != nil {
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return nil, err
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}
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return Parse(allowedTypes, cookie.Value, fn)
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}
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func CheckCsrf(r *http.Request, fn SecretFunc) error {
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// get and options requests are always
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// enabled, without CSRF checks.
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switch r.Method {
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case http.MethodGet, http.MethodOptions:
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return nil
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}
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// parse the raw CSRF token value and validate
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raw := r.Header.Get("X-CSRF-TOKEN")
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_, err := Parse([]Type{CsrfToken}, raw, fn)
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return err
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}
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func New(tokenType Type) *Token {
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return &Token{Type: tokenType, claims: jwt.MapClaims{}}
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}
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// Sign signs the token using the given secret hash
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// and returns the string value.
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func (t *Token) Sign(secret string) (string, error) {
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return t.SignExpires(secret, 0)
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}
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// Sign signs the token using the given secret hash
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// with an expiration date.
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func (t *Token) SignExpires(secret string, exp int64) (string, error) {
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token := jwt.New(jwt.SigningMethodHS256)
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claims, ok := token.Claims.(jwt.MapClaims)
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if !ok {
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return "", fmt.Errorf("token claim is not a MapClaims")
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}
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for k, v := range t.claims {
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claims[k] = v
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}
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claims["type"] = t.Type
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if exp > 0 {
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claims["exp"] = float64(exp)
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}
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return token.SignedString([]byte(secret))
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}
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func (t *Token) Set(key, value string) {
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t.claims[key] = value
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}
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func (t *Token) Get(key string) string {
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claim, ok := t.claims[key].(string)
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if !ok {
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return ""
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}
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return claim
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}
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func keyFunc(token *Token, fn SecretFunc) jwt.Keyfunc {
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return func(t *jwt.Token) (any, error) {
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claims, ok := t.Claims.(jwt.MapClaims)
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if !ok {
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return nil, fmt.Errorf("token claim is not a MapClaims")
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}
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// validate the correct algorithm is being used
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if t.Method.Alg() != SignerAlgo {
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return nil, jwt.ErrSignatureInvalid
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}
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// extract the token type and cast to the expected type
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tokenType, ok := claims["type"].(string)
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if !ok {
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return nil, jwt.ErrInvalidType
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}
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token.Type = Type(tokenType)
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// copy custom claims
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for k, v := range claims {
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// skip the reserved claims https://datatracker.ietf.org/doc/html/rfc7519#section-4.1
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if k == "iss" || k == "sub" || k == "aud" || k == "exp" || k == "nbf" || k == "iat" || k == "jti" {
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continue
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}
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if k == "type" {
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continue
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}
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token.claims[k] = v
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}
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// invoke the callback function to retrieve
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// the secret key used to verify
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secret, err := fn(token)
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return []byte(secret), err
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}
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}
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