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authentik/internal/outpost/proxyv2/application/auth.go

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package application
import (
"fmt"
"net/http"
"time"
"goauthentik.io/internal/outpost/proxyv2/constants"
)
// checkAuth Get claims which are currently in session
// Returns an error if the session can't be loaded or the claims can't be parsed/type-cast
func (a *Application) checkAuth(rw http.ResponseWriter, r *http.Request) (*Claims, error) {
c := a.getClaimsFromSession(r)
if c != nil {
return c, nil
}
if rw == nil {
return nil, fmt.Errorf("no response writer")
}
// Check TTL cache
c = a.getClaimsFromCache(r)
if c != nil {
return c, nil
}
// Check bearer token if set
bearer := a.checkAuthHeaderBearer(r)
if bearer != "" {
a.log.Trace("checking bearer token")
tc := a.attemptBearerAuth(bearer)
if tc != nil {
return a.saveAndCacheClaims(rw, r, tc.Claims)
}
a.log.Trace("no/invalid bearer token")
}
// Check basic auth if set
username, password, basicSet := r.BasicAuth()
if basicSet {
a.log.Trace("checking basic auth")
tc := a.attemptBasicAuth(username, password)
if tc != nil {
return a.saveAndCacheClaims(rw, r, *tc)
}
a.log.Trace("no/invalid basic auth")
}
return nil, fmt.Errorf("failed to get claims from session")
}
func (a *Application) getClaimsFromSession(r *http.Request) *Claims {
s, err := a.sessions.Get(r, constants.SessionName)
if err != nil {
// err == user has no session/session is not valid, reject
return nil
}
claims, ok := s.Values[constants.SessionClaims]
if claims == nil || !ok {
// no claims saved, reject
return nil
}
c, ok := claims.(Claims)
if !ok {
return nil
}
return &c
}
func (a *Application) getClaimsFromCache(r *http.Request) *Claims {
key := r.Header.Get(constants.HeaderAuthorization)
item := a.authHeaderCache.Get(key)
if item != nil && !item.IsExpired() {
v := item.Value()
return &v
}
return nil
}
func (a *Application) saveAndCacheClaims(rw http.ResponseWriter, r *http.Request, claims Claims) (*Claims, error) {
s, _ := a.sessions.Get(r, constants.SessionName)
s.Values[constants.SessionClaims] = claims
err := s.Save(r, rw)
if err != nil {
return nil, err
}
key := r.Header.Get(constants.HeaderAuthorization)
item := a.authHeaderCache.Get(key)
// Don't set when the key is already found
if item == nil {
a.authHeaderCache.Set(key, claims, time.Second*60)
}
r.Header.Del(constants.HeaderAuthorization)
return &claims, nil
}