emissary/internal/auth/thirdparty/authenticator.go

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2023-03-13 10:44:58 +01:00
package thirdparty
import (
"context"
"net/http"
"strings"
"time"
"forge.cadoles.com/Cadoles/emissary/internal/auth"
"forge.cadoles.com/Cadoles/emissary/internal/jwk"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
const DefaultAcceptableSkew = 5 * time.Minute
type Authenticator struct {
keys jwk.Set
issuer string
acceptableSkew time.Duration
}
// Authenticate implements auth.Authenticator.
func (a *Authenticator) Authenticate(ctx context.Context, r *http.Request) (auth.User, error) {
ctx = logger.With(r.Context(), logger.F("remoteAddr", r.RemoteAddr))
authorization := r.Header.Get("Authorization")
if authorization == "" {
return nil, errors.WithStack(auth.ErrUnauthenticated)
}
rawToken := strings.TrimPrefix(authorization, "Bearer ")
if rawToken == "" {
return nil, errors.WithStack(auth.ErrUnauthenticated)
}
token, err := parseToken(ctx, a.keys, a.issuer, rawToken, a.acceptableSkew)
if err != nil {
return nil, errors.WithStack(err)
}
rawRole, exists := token.Get(keyRole)
if !exists {
return nil, errors.New("could not find 'thumbprint' claim")
}
role, ok := rawRole.(string)
if !ok {
return nil, errors.Errorf("unexpected '%s' claim value: '%v'", keyRole, rawRole)
}
if !isValidRole(role) {
return nil, errors.Errorf("invalid role '%s'", role)
}
user := &User{
subject: token.Subject(),
role: Role(role),
}
return user, nil
}
func NewAuthenticator(keys jwk.Set, issuer string, acceptableSkew time.Duration) *Authenticator {
return &Authenticator{
keys: keys,
issuer: issuer,
acceptableSkew: acceptableSkew,
}
}
var _ auth.Authenticator = &Authenticator{}