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Revert "decompose OIDCCallback method"

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This reverts commit 395caaad42.
This commit is contained in:
Grigoriy Mikhalkin 2022-07-21 23:47:59 +02:00
parent 395caaad42
commit 56858a56db
2 changed files with 62 additions and 196 deletions
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240
oidc.go
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@ -136,82 +136,6 @@ func (h *Headscale) OIDCCallback(
writer http.ResponseWriter,
req *http.Request,
) {
code, state, ok := validateOIDCCallbackParams(writer, req)
if !ok {
return
}
rawIDToken, ok := h.getIDTokenForOIDCCallback(writer, code, state)
if !ok {
return
}
idToken, ok := h.verifyIDTokenForOIDCCallback(writer, rawIDToken)
if !ok {
return
}
// TODO: we can use userinfo at some point to grab additional information about the user (groups membership, etc)
// userInfo, err := oidcProvider.UserInfo(context.Background(), oauth2.StaticTokenSource(oauth2Token))
// if err != nil {
// c.String(http.StatusBadRequest, fmt.Sprintf("Failed to retrieve userinfo"))
// return
// }
claims, ok := extractIDTokenClaims(writer, idToken)
if !ok {
return
}
if ok := validateOIDCAllowedDomains(writer, h.cfg.OIDC.AllowedDomains, claims); !ok {
return
}
if ok := validateOIDCAllowedUsers(writer, h.cfg.OIDC.AllowedUsers, claims); !ok {
return
}
machineKey, ok := h.validateMachineForOIDCCallback(writer, state, claims)
if !ok {
return
}
namespaceName, ok := getNamespaceName(writer, claims, h.cfg.OIDC.StripEmaildomain)
if !ok {
return
}
// register the machine if it's new
log.Debug().Msg("Registering new machine after successful callback")
namespace, ok := h.findOrCreateNewNamespaceForOIDCCallback(writer, namespaceName)
if !ok {
return
}
if ok := h.registerMachineForOIDCCallback(writer, namespace, machineKey); !ok {
return
}
content, ok := renderOIDCCallbackTemplate(writer, claims)
if !ok {
return
}
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
writer.WriteHeader(http.StatusOK)
if _, err := writer.Write(content.Bytes()); err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
}
func validateOIDCCallbackParams(
writer http.ResponseWriter,
req *http.Request,
) (string, string, bool) {
code := req.URL.Query().Get("code")
state := req.URL.Query().Get("state")
@ -226,16 +150,9 @@ func validateOIDCCallbackParams(
Msg("Failed to write response")
}
return "", "", false
return
}
return code, state, true
}
func (h *Headscale) getIDTokenForOIDCCallback(
writer http.ResponseWriter,
code, state string,
) (string, bool) {
oauth2Token, err := h.oauth2Config.Exchange(context.Background(), code)
if err != nil {
log.Error().
@ -252,7 +169,7 @@ func (h *Headscale) getIDTokenForOIDCCallback(
Msg("Failed to write response")
}
return "", false
return
}
log.Trace().
@ -273,17 +190,11 @@ func (h *Headscale) getIDTokenForOIDCCallback(
Msg("Failed to write response")
}
return "", false
return
}
return rawIDToken, true
}
func (h *Headscale) verifyIDTokenForOIDCCallback(
writer http.ResponseWriter,
rawIDToken string,
) (*oidc.IDToken, bool) {
verifier := h.oidcProvider.Verifier(&oidc.Config{ClientID: h.cfg.OIDC.ClientID})
idToken, err := verifier.Verify(context.Background(), rawIDToken)
if err != nil {
log.Error().
@ -300,18 +211,19 @@ func (h *Headscale) verifyIDTokenForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
return idToken, true
}
// TODO: we can use userinfo at some point to grab additional information about the user (groups membership, etc)
// userInfo, err := oidcProvider.UserInfo(context.Background(), oauth2.StaticTokenSource(oauth2Token))
// if err != nil {
// c.String(http.StatusBadRequest, fmt.Sprintf("Failed to retrieve userinfo"))
// return
// }
func extractIDTokenClaims(
writer http.ResponseWriter,
idToken *oidc.IDToken,
) (*IDTokenClaims, bool) {
// Extract custom claims
var claims IDTokenClaims
if err := idToken.Claims(claims); err != nil {
if err = idToken.Claims(&claims); err != nil {
log.Error().
Err(err).
Caller().
@ -326,22 +238,13 @@ func extractIDTokenClaims(
Msg("Failed to write response")
}
return nil, false
return
}
return &claims, true
}
// validateOIDCAllowedDomains checks that if AllowedDomains is provided,
// that the authenticated principal ends with @<alloweddomain>.
func validateOIDCAllowedDomains(
writer http.ResponseWriter,
allowedDomains []string,
claims *IDTokenClaims,
) bool {
if len(allowedDomains) > 0 {
// If AllowedDomains is provided, check that the authenticated principal ends with @<alloweddomain>.
if len(h.cfg.OIDC.AllowedDomains) > 0 {
if at := strings.LastIndex(claims.Email, "@"); at < 0 ||
!IsStringInSlice(allowedDomains, claims.Email[at+1:]) {
!IsStringInSlice(h.cfg.OIDC.AllowedDomains, claims.Email[at+1:]) {
log.Error().Msg("authenticated principal does not match any allowed domain")
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
writer.WriteHeader(http.StatusBadRequest)
@ -353,22 +256,13 @@ func validateOIDCAllowedDomains(
Msg("Failed to write response")
}
return false
return
}
}
return true
}
// validateOIDCAllowedUsers checks that if AllowedUsers is provided,
// that the authenticated principal is part of that list.
func validateOIDCAllowedUsers(
writer http.ResponseWriter,
allowedUsers []string,
claims *IDTokenClaims,
) bool {
if len(allowedUsers) > 0 &&
!IsStringInSlice(allowedUsers, claims.Email) {
// If AllowedUsers is provided, check that the authenticated princial is part of that list.
if len(h.cfg.OIDC.AllowedUsers) > 0 &&
!IsStringInSlice(h.cfg.OIDC.AllowedUsers, claims.Email) {
log.Error().Msg("authenticated principal does not match any allowed user")
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
writer.WriteHeader(http.StatusBadRequest)
@ -380,23 +274,12 @@ func validateOIDCAllowedUsers(
Msg("Failed to write response")
}
return false
return
}
return true
}
// validateMachine retrieves machine information if it exist
// The error is not important, because if it does not
// exist, then this is a new machine and we will move
// on to registration.
func (h *Headscale) validateMachineForOIDCCallback(
writer http.ResponseWriter,
state string,
claims *IDTokenClaims,
) (*key.MachinePublic, bool) {
// retrieve machinekey from state cache
machineKeyIf, machineKeyFound := h.registrationCache.Get(state)
if !machineKeyFound {
log.Error().
Msg("requested machine state key expired before authorisation completed")
@ -410,12 +293,13 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
var machineKey key.MachinePublic
machineKeyFromCache, machineKeyOK := machineKeyIf.(string)
err := machineKey.UnmarshalText(
var machineKey key.MachinePublic
err = machineKey.UnmarshalText(
[]byte(MachinePublicKeyEnsurePrefix(machineKeyFromCache)),
)
if err != nil {
@ -431,7 +315,7 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
if !machineKeyOK {
@ -446,7 +330,7 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
// retrieve machine information if it exist
@ -469,7 +353,7 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to refresh machine")
http.Error(writer, "Failed to refresh machine", http.StatusInternalServerError)
return nil, false
return
}
var content bytes.Buffer
@ -493,7 +377,7 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
@ -506,20 +390,12 @@ func (h *Headscale) validateMachineForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
return &machineKey, true
}
func getNamespaceName(
writer http.ResponseWriter,
claims *IDTokenClaims,
stripEmaildomain bool,
) (string, bool) {
namespaceName, err := NormalizeToFQDNRules(
claims.Email,
stripEmaildomain,
h.cfg.OIDC.StripEmaildomain,
)
if err != nil {
log.Error().Err(err).Caller().Msgf("couldn't normalize email")
@ -533,16 +409,12 @@ func getNamespaceName(
Msg("Failed to write response")
}
return "", false
return
}
return namespaceName, true
}
// register the machine if it's new
log.Debug().Msg("Registering new machine after successful callback")
func (h *Headscale) findOrCreateNewNamespaceForOIDCCallback(
writer http.ResponseWriter,
namespaceName string,
) (*Namespace, bool) {
namespace, err := h.GetNamespace(namespaceName)
if errors.Is(err, errNamespaceNotFound) {
namespace, err = h.CreateNamespace(namespaceName)
@ -562,7 +434,7 @@ func (h *Headscale) findOrCreateNewNamespaceForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
} else if err != nil {
log.Error().
@ -580,24 +452,17 @@ func (h *Headscale) findOrCreateNewNamespaceForOIDCCallback(
Msg("Failed to write response")
}
return nil, false
return
}
return namespace, true
}
machineKeyStr := MachinePublicKeyStripPrefix(machineKey)
func (h *Headscale) registerMachineForOIDCCallback(
writer http.ResponseWriter,
namespace *Namespace,
machineKey *key.MachinePublic,
) bool {
machineKeyStr := MachinePublicKeyStripPrefix(*machineKey)
if _, err := h.RegisterMachineFromAuthCallback(
_, err = h.RegisterMachineFromAuthCallback(
machineKeyStr,
namespace.Name,
RegisterMethodOIDC,
); err != nil {
)
if err != nil {
log.Error().
Caller().
Err(err).
@ -612,16 +477,9 @@ func (h *Headscale) registerMachineForOIDCCallback(
Msg("Failed to write response")
}
return false
return
}
return true
}
func renderOIDCCallbackTemplate(
writer http.ResponseWriter,
claims *IDTokenClaims,
) (*bytes.Buffer, bool) {
var content bytes.Buffer
if err := oidcCallbackTemplate.Execute(&content, oidcCallbackTemplateConfig{
User: claims.Email,
@ -643,8 +501,16 @@ func renderOIDCCallbackTemplate(
Msg("Failed to write response")
}
return nil, false
return
}
return &content, true
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
writer.WriteHeader(http.StatusOK)
_, err = writer.Write(content.Bytes())
if err != nil {
log.Error().
Caller().
Err(err).
Msg("Failed to write response")
}
}