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forgejo/services/packages/auth.go
Gusted 5a871f6095
[SEC] Ensure propagation of API scopes for Conan and Container authentication
- The Conan and Container packages use a different type of
authentication. It first authenticates via the regular way (api tokens
or user:password, handled via `auth.Basic`) and then generates a JWT
token that is used by the package software (such as Docker) to do the
action they wanted to do. This JWT token didn't properly propagate the
API scopes that the token was generated for, and thus could lead to a
'scope escalation' within the Conan and Container packages, read
access to write access.
- Store the API scope in the JWT token, so it can be propagated on
subsequent calls that uses that JWT token.
- Integration test added.
- Resolves #5128
2024-08-28 10:33:32 +02:00

75 lines
1.8 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package packages
import (
"fmt"
"net/http"
"strings"
"time"
auth_model "code.gitea.io/gitea/models/auth"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/golang-jwt/jwt/v5"
)
type packageClaims struct {
jwt.RegisteredClaims
UserID int64
Scope auth_model.AccessTokenScope
}
func CreateAuthorizationToken(u *user_model.User, scope auth_model.AccessTokenScope) (string, error) {
now := time.Now()
claims := packageClaims{
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(now.Add(24 * time.Hour)),
NotBefore: jwt.NewNumericDate(now),
},
UserID: u.ID,
Scope: scope,
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString(setting.GetGeneralTokenSigningSecret())
if err != nil {
return "", err
}
return tokenString, nil
}
func ParseAuthorizationToken(req *http.Request) (int64, auth_model.AccessTokenScope, error) {
h := req.Header.Get("Authorization")
if h == "" {
return 0, "", nil
}
parts := strings.SplitN(h, " ", 2)
if len(parts) != 2 {
log.Error("split token failed: %s", h)
return 0, "", fmt.Errorf("split token failed")
}
token, err := jwt.ParseWithClaims(parts[1], &packageClaims{}, func(t *jwt.Token) (any, error) {
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
}
return setting.GetGeneralTokenSigningSecret(), nil
})
if err != nil {
return 0, "", err
}
c, ok := token.Claims.(*packageClaims)
if !token.Valid || !ok {
return 0, "", fmt.Errorf("invalid token claim")
}
return c.UserID, c.Scope, nil
}