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bouncer.go
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bouncer.go
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package security
import (
httperror "github.com/baasapi/libhttp/error"
"github.com/baasapi/baasapi/api"
"net/http"
"strings"
)
type (
// RequestBouncer represents an entity that manages API request accesses
RequestBouncer struct {
jwtService baasapi.JWTService
userService baasapi.UserService
teamMembershipService baasapi.TeamMembershipService
baask8sGroupService baasapi.Baask8sGroupService
authDisabled bool
}
// RequestBouncerParams represents the required parameters to create a new RequestBouncer instance.
RequestBouncerParams struct {
JWTService baasapi.JWTService
UserService baasapi.UserService
TeamMembershipService baasapi.TeamMembershipService
Baask8sGroupService baasapi.Baask8sGroupService
AuthDisabled bool
}
// RestrictedRequestContext is a data structure containing information
// used in RestrictedAccess
RestrictedRequestContext struct {
IsAdmin bool
IsTeamLeader bool
UserID baasapi.UserID
UserMemberships []baasapi.TeamMembership
}
)
// NewRequestBouncer initializes a new RequestBouncer
func NewRequestBouncer(parameters *RequestBouncerParams) *RequestBouncer {
return &RequestBouncer{
jwtService: parameters.JWTService,
userService: parameters.UserService,
teamMembershipService: parameters.TeamMembershipService,
baask8sGroupService: parameters.Baask8sGroupService,
authDisabled: parameters.AuthDisabled,
}
}
// PublicAccess defines a security check for public baask8ss.
// No authentication is required to access these baask8ss.
func (bouncer *RequestBouncer) PublicAccess(h http.Handler) http.Handler {
h = mwSecureHeaders(h)
return h
}
// AuthenticatedAccess defines a security check for private baask8ss.
// Authentication is required to access these baask8ss.
func (bouncer *RequestBouncer) AuthenticatedAccess(h http.Handler) http.Handler {
h = bouncer.mwCheckAuthentication(h)
h = mwSecureHeaders(h)
return h
}
// RestrictedAccess defines a security check for restricted baask8ss.
// Authentication is required to access these baask8ss.
// The request context will be enhanced with a RestrictedRequestContext object
// that might be used later to authorize/filter access to resources.
func (bouncer *RequestBouncer) RestrictedAccess(h http.Handler) http.Handler {
h = bouncer.mwUpgradeToRestrictedRequest(h)
h = bouncer.AuthenticatedAccess(h)
return h
}
// AdministratorAccess defines a chain of middleware for restricted baask8ss.
// Authentication as well as administrator role are required to access these baask8ss.
func (bouncer *RequestBouncer) AdministratorAccess(h http.Handler) http.Handler {
h = mwCheckAdministratorRole(h)
h = bouncer.AuthenticatedAccess(h)
return h
}
// Baask8sAccess retrieves the JWT token from the request context and verifies
// that the user can access the specified baask8s.
// An error is returned when access is denied.
func (bouncer *RequestBouncer) Baask8sAccess(r *http.Request, baask8s *baasapi.Baask8s) error {
tokenData, err := RetrieveTokenData(r)
if err != nil {
return err
}
if tokenData.Role == baasapi.AdministratorRole {
return nil
}
memberships, err := bouncer.teamMembershipService.TeamMembershipsByUserID(tokenData.ID)
if err != nil {
return err
}
//group, err := bouncer.baask8sGroupService.Baask8sGroup(baask8s.GroupID)
//if err != nil {
// return err
//}
//if !authorizedBaask8sAccess(baask8s, group, tokenData.ID, memberships) {
if !authorizedBaask8sAccess(baask8s, tokenData.ID, memberships) {
return baasapi.ErrBaask8sAccessDenied
}
return nil
}
// RegistryAccess retrieves the JWT token from the request context and verifies
// that the user can access the specified registry.
// An error is returned when access is denied.
func (bouncer *RequestBouncer) RegistryAccess(r *http.Request, registry *baasapi.Registry) error {
tokenData, err := RetrieveTokenData(r)
if err != nil {
return err
}
if tokenData.Role == baasapi.AdministratorRole {
return nil
}
memberships, err := bouncer.teamMembershipService.TeamMembershipsByUserID(tokenData.ID)
if err != nil {
return err
}
if !AuthorizedRegistryAccess(registry, tokenData.ID, memberships) {
return baasapi.ErrBaask8sAccessDenied
}
return nil
}
// mwSecureHeaders provides secure headers middleware for handlers.
func mwSecureHeaders(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("X-XSS-Protection", "1; mode=block")
w.Header().Add("X-Content-Type-Options", "nosniff")
next.ServeHTTP(w, r)
})
}
// mwUpgradeToRestrictedRequest will enhance the current request with
// a new RestrictedRequestContext object.
func (bouncer *RequestBouncer) mwUpgradeToRestrictedRequest(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tokenData, err := RetrieveTokenData(r)
if err != nil {
httperror.WriteError(w, http.StatusForbidden, "Access denied", baasapi.ErrResourceAccessDenied)
return
}
requestContext, err := bouncer.newRestrictedContextRequest(tokenData.ID, tokenData.Role)
if err != nil {
httperror.WriteError(w, http.StatusInternalServerError, "Unable to create restricted request context ", err)
return
}
ctx := storeRestrictedRequestContext(r, requestContext)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
// mwCheckAdministratorRole check the role of the user associated to the request
func mwCheckAdministratorRole(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tokenData, err := RetrieveTokenData(r)
if err != nil || tokenData.Role != baasapi.AdministratorRole {
httperror.WriteError(w, http.StatusForbidden, "Access denied", baasapi.ErrResourceAccessDenied)
return
}
next.ServeHTTP(w, r)
})
}
// mwCheckAuthentication provides Authentication middleware for handlers
func (bouncer *RequestBouncer) mwCheckAuthentication(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var tokenData *baasapi.TokenData
if !bouncer.authDisabled {
var token string
// Optionally, token might be set via the "token" query parameter.
// For example, in websocket requests
token = r.URL.Query().Get("token")
// Get token from the Authorization header
tokens, ok := r.Header["Authorization"]
if ok && len(tokens) >= 1 {
token = tokens[0]
token = strings.TrimPrefix(token, "Bearer ")
}
if token == "" {
httperror.WriteError(w, http.StatusUnauthorized, "Unauthorized", baasapi.ErrUnauthorized)
return
}
var err error
tokenData, err = bouncer.jwtService.ParseAndVerifyToken(token)
if err != nil {
httperror.WriteError(w, http.StatusUnauthorized, "Invalid JWT token", err)
return
}
_, err = bouncer.userService.User(tokenData.ID)
if err != nil && err == baasapi.ErrObjectNotFound {
httperror.WriteError(w, http.StatusUnauthorized, "Unauthorized", baasapi.ErrUnauthorized)
return
} else if err != nil {
httperror.WriteError(w, http.StatusInternalServerError, "Unable to retrieve users from the database", err)
return
}
} else {
tokenData = &baasapi.TokenData{
Role: baasapi.AdministratorRole,
}
}
ctx := storeTokenData(r, tokenData)
next.ServeHTTP(w, r.WithContext(ctx))
return
})
}
func (bouncer *RequestBouncer) newRestrictedContextRequest(userID baasapi.UserID, userRole baasapi.UserRole) (*RestrictedRequestContext, error) {
requestContext := &RestrictedRequestContext{
IsAdmin: true,
UserID: userID,
}
if userRole != baasapi.AdministratorRole {
requestContext.IsAdmin = false
memberships, err := bouncer.teamMembershipService.TeamMembershipsByUserID(userID)
if err != nil {
return nil, err
}
isTeamLeader := false
for _, membership := range memberships {
if membership.Role == baasapi.TeamLeader {
isTeamLeader = true
}
}
requestContext.IsTeamLeader = isTeamLeader
requestContext.UserMemberships = memberships
}
return requestContext, nil
}