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authenticate.go
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authenticate.go
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// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package authz
import (
"context"
"github.com/datamixio/lib-go-authcrunch/pkg/authz/bypass"
"github.com/datamixio/lib-go-authcrunch/pkg/authz/handlers"
"github.com/datamixio/lib-go-authcrunch/pkg/errors"
"github.com/datamixio/lib-go-authcrunch/pkg/requests"
"github.com/datamixio/lib-go-authcrunch/pkg/user"
"github.com/datamixio/lib-go-authcrunch/pkg/util"
addrutil "github.com/datamixio/lib-go-authcrunch/pkg/util/addr"
"github.com/datamixio/lib-go-authcrunch/pkg/util/validate"
"go.uber.org/zap"
"net/http"
"net/url"
"strings"
)
var (
placeholders = []string{
"http.request.uri", "uri",
"url",
}
)
// Authenticate authorizes HTTP requests.
func (g *Gatekeeper) Authenticate(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
// Perform authorization bypass checks
if g.bypassEnabled && bypass.Match(r, g.config.BypassConfigs) {
ar.Response.Authorized = false
ar.Response.Bypassed = true
g.logger.Info(
"authorization bypassed",
zap.String("session_id", ar.SessionID),
zap.String("request_id", ar.ID),
zap.String("src_ip", addrutil.GetSourceAddress(r)),
zap.String("src_conn_ip", addrutil.GetSourceConnAddress(r)),
zap.String("url", addrutil.GetTargetURL(r)),
)
return nil
}
g.parseSessionID(r, ar)
usr, err := g.tokenValidator.Authorize(context.Background(), r, ar)
if err != nil {
ar.Response.Error = err
return g.handleUnauthorizedUser(w, r, ar)
}
return g.handleAuthorizedUser(w, r, ar, usr)
}
// handleAuthorizedUser handles authorized requests.
func (g *Gatekeeper) handleAuthorizedUser(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest, usr *user.User) error {
g.injectHeaders(r, usr)
g.stripAuthToken(r, usr)
ar.Response.Authorized = true
if usr.Cached {
ar.Response.User = usr.GetRequestIdentity()
return nil
}
ar.Response.User = usr.BuildRequestIdentity(g.config.UserIdentityField)
if err := g.tokenValidator.CacheUser(usr); err != nil {
g.logger.Error(
"token caching error",
zap.String("session_id", ar.SessionID),
zap.String("request_id", ar.ID),
zap.Error(err),
)
}
return nil
}
// parseSessionID extracts Session ID from HTTP request.
func (g *Gatekeeper) parseSessionID(r *http.Request, ar *requests.AuthorizationRequest) {
if cookie, err := r.Cookie("AUTHP_SESSION_ID"); err == nil {
v, err := url.Parse(cookie.Value)
if err == nil && v.String() != "" {
ar.SessionID = util.SanitizeSessionID(v.String())
}
}
}
// handleUnauthorizedUser handles failed authorization requests.
func (g *Gatekeeper) handleUnauthorizedUser(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
err := ar.Response.Error
g.logger.Debug(
"token validation error",
zap.String("session_id", ar.SessionID),
zap.String("request_id", ar.ID),
zap.Error(err),
)
switch {
case (err == errors.ErrAccessNotAllowed) || (err == errors.ErrAccessNotAllowedByPathACL):
return g.handleAuthorizeWithForbidden(w, r, ar)
case (err == errors.ErrBasicAuthFailed) || (err == errors.ErrAPIKeyAuthFailed):
return g.handleAuthorizeWithAuthFailed(w, r, ar)
case err == errors.ErrCryptoKeyStoreTokenData:
return g.handleAuthorizeWithBadRequest(w, r, ar)
}
g.expireAuthCookies(w, r)
if !g.config.AuthRedirectDisabled {
return g.handleAuthorizeWithRedirect(w, r, ar)
}
return err
}
// expireAuthCookies sends cookie delete in HTTP response.
func (g *Gatekeeper) expireAuthCookies(w http.ResponseWriter, r *http.Request) {
cookies := g.tokenValidator.GetAuthCookies()
if cookies == nil {
return
}
for _, cookie := range r.Cookies() {
if _, exists := cookies[cookie.Name]; !exists {
continue
}
w.Header().Add("Set-Cookie", cookie.Name+"=delete; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT")
}
return
}
// handleAuthorizeWithAuthFailed handles failed authorization requests based on
// basic authentication and API keys.
func (g *Gatekeeper) handleAuthorizeWithAuthFailed(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
g.expireAuthCookies(w, r)
w.WriteHeader(401)
w.Write([]byte(`401 Unauthorized`))
return ar.Response.Error
}
// handleAuthorizeWithBadRequest handles failed authorization requests where
// user data was insufficient to establish a user.
func (g *Gatekeeper) handleAuthorizeWithBadRequest(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
g.expireAuthCookies(w, r)
w.WriteHeader(400)
w.Write([]byte(`400 Bad Request`))
return ar.Response.Error
}
// handleAuthorizeWithForbidden handles forbidden responses.
func (g *Gatekeeper) handleAuthorizeWithForbidden(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
if g.config.ForbiddenURL == "" {
w.WriteHeader(403)
w.Write([]byte(`Forbidden`))
return ar.Response.Error
}
if strings.Contains(g.config.ForbiddenURL, "{") && strings.Contains(g.config.ForbiddenURL, "}") {
// Run through placeholder replacer.
redirectLocation := g.config.ForbiddenURL
for _, placeholder := range placeholders {
switch placeholder {
case "uri", "http.request.uri":
redirectLocation = strings.ReplaceAll(redirectLocation, "{"+placeholder+"}", r.URL.String())
case "url":
redirectLocation = strings.ReplaceAll(redirectLocation, "{"+placeholder+"}", util.GetCurrentURL(r))
}
}
w.Header().Set("Location", redirectLocation)
} else {
w.Header().Set("Location", g.config.ForbiddenURL)
}
w.WriteHeader(303)
w.Write([]byte(`Forbidden`))
return ar.Response.Error
}
func (g *Gatekeeper) handleAuthorizeWithRedirect(w http.ResponseWriter, r *http.Request, ar *requests.AuthorizationRequest) error {
if ar.Redirect.AuthURL == "" {
ar.Redirect.AuthURL = g.config.AuthURLPath
}
ar.Redirect.QueryDisabled = g.config.AuthRedirectQueryDisabled
ar.Redirect.QueryParameter = g.config.AuthRedirectQueryParameter
if g.config.AuthRedirectStatusCode > 0 {
ar.Redirect.StatusCode = g.config.AuthRedirectStatusCode
}
if len(g.config.LoginHintValidators) > 0 {
g.handleLoginHint(r, ar)
}
if g.config.AdditionalScopes {
g.handleAdditionalScopes(r, ar)
}
if g.config.RedirectWithJavascript {
g.logger.Debug(
"redirecting unauthorized user",
zap.String("session_id", ar.SessionID),
zap.String("request_id", ar.ID),
zap.String("method", "js"),
)
handlers.HandleJavascriptRedirect(w, r, ar)
} else {
g.logger.Debug(
"redirecting unauthorized user",
zap.String("session_id", ar.SessionID),
zap.String("request_id", ar.ID),
zap.String("method", "location"),
)
handlers.HandleLocationHeaderRedirect(w, r, ar)
}
return ar.Response.Error
}
func (g *Gatekeeper) stripAuthToken(r *http.Request, usr *user.User) {
if !g.config.StripTokenEnabled {
return
}
switch usr.TokenSource {
case "cookie":
if usr.TokenName == "" {
return
}
if _, exists := r.Header["Cookie"]; !exists {
return
}
for i, entry := range r.Header["Cookie"] {
var updatedEntry []string
var updateCookie bool
for _, cookie := range strings.Split(entry, ";") {
s := strings.TrimSpace(cookie)
if strings.HasPrefix(s, usr.TokenName+"=") {
// Skip the cookie matching the token name.
updateCookie = true
continue
}
if strings.Contains(s, usr.Token) {
// Skip the cookie with the value matching user token.
updateCookie = true
continue
}
updatedEntry = append(updatedEntry, cookie)
}
if !updateCookie {
continue
}
r.Header["Cookie"][i] = strings.Join(updatedEntry, ";")
}
}
}
func (g *Gatekeeper) injectHeaders(r *http.Request, usr *user.User) {
if g.config.PassClaimsWithHeaders {
// Inject default X-Token headers.
headers := usr.GetRequestHeaders()
if headers == nil {
headers = make(map[string]string)
if usr.Claims.Name != "" {
headers["X-Token-User-Name"] = usr.Claims.Name
}
if usr.Claims.Email != "" {
headers["X-Token-User-Email"] = usr.Claims.Email
}
if len(usr.Claims.Roles) > 0 {
headers["X-Token-User-Roles"] = strings.Join(usr.Claims.Roles, " ")
}
if usr.Claims.Subject != "" {
headers["X-Token-Subject"] = usr.Claims.Subject
}
usr.SetRequestHeaders(headers)
}
for k, v := range headers {
if g.injectedHeaders != nil {
if _, exists := g.injectedHeaders[k]; exists {
continue
}
}
r.Header.Set(k, v)
}
}
// Inject custom headers.
for _, entry := range g.config.HeaderInjectionConfigs {
if v := usr.GetClaimValueByField(entry.Field); v != "" {
r.Header.Set(entry.Header, v)
}
}
}
func (g *Gatekeeper) handleLoginHint(r *http.Request, ar *requests.AuthorizationRequest) {
if loginHint := r.URL.Query().Get("login_hint"); loginHint != "" {
if err := validate.LoginHint(loginHint, g.config.LoginHintValidators); err != nil {
g.logger.Warn(err.Error())
} else {
ar.Redirect.LoginHint = loginHint
}
}
}
func (g *Gatekeeper) handleAdditionalScopes(r *http.Request, ar *requests.AuthorizationRequest) {
if additionalScopes := r.URL.Query().Get("additional_scopes"); additionalScopes != "" {
if err := validate.AdditionalScopes(additionalScopes); err != nil {
g.logger.Warn("Provide a valid set of additional scopes in the query parameter (ex.: scope_A scopeB)",
zap.String("additional_scopes", additionalScopes),
zap.Error(err),
)
} else {
ar.Redirect.AdditionalScopes = additionalScopes
}
}
}