87 lines
2.9 KiB
Go
87 lines
2.9 KiB
Go
// Package mfa provides wrappers to add multi-factor authentication
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// to any auth backend.
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//
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// To add MFA to a backend, replace its login path with the
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// paths returned by MFAPaths and add the additional root
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// paths returned by MFARootPaths. The backend provides
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// the username to the MFA wrapper in Auth.Metadata['username'].
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//
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// To add an additional MFA type, create a subpackage that
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// implements [Type]Paths, [Type]RootPaths, and [Type]Handler
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// functions and add them to MFAPaths, MFARootPaths, and
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// handlers respectively.
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package mfa
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import (
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"github.com/hashicorp/vault/helper/mfa/duo"
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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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)
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// MFAPaths returns paths to wrap the original login path and configure MFA.
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// When adding MFA to a backend, these paths should be included instead of
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// the login path in Backend.Paths.
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func MFAPaths(originalBackend *framework.Backend, loginPath *framework.Path) []*framework.Path {
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var b backend
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b.Backend = originalBackend
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return append(duo.DuoPaths(), pathMFAConfig(&b), wrapLoginPath(&b, loginPath))
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}
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// MFARootPaths returns path strings used to configure MFA. When adding MFA
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// to a backend, these paths should be included in
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// Backend.PathsSpecial.Root.
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func MFARootPaths() []string {
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return append(duo.DuoRootPaths(), "mfa_config")
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}
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// HandlerFunc is the callback called to handle MFA for a login request.
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type HandlerFunc func (*logical.Request, *framework.FieldData, *logical.Response) (*logical.Response, error)
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// handlers maps each supported MFA type to its handler.
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var handlers = map[string]HandlerFunc{
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"duo": duo.DuoHandler,
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}
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type backend struct {
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*framework.Backend
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}
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func wrapLoginPath(b *backend, loginPath *framework.Path) *framework.Path {
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loginPath.Fields["passcode"] = &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "One time passcode (optional)",
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}
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loginPath.Fields["method"] = &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "Multi-factor auth method to use (optional)",
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}
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// wrap write callback to do MFA after auth
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loginHandler := loginPath.Callbacks[logical.WriteOperation]
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loginPath.Callbacks[logical.WriteOperation] = b.wrapLoginHandler(loginHandler)
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return loginPath
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}
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func (b *backend) wrapLoginHandler(loginHandler framework.OperationFunc) framework.OperationFunc {
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return func (req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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// login with original login function first
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resp, err := loginHandler(req, d);
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if err != nil || resp.Auth == nil {
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return resp, err
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}
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// check if multi-factor enabled
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mfa_config, err := b.MFAConfig(req)
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if err != nil || mfa_config == nil {
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return resp, nil
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}
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// perform multi-factor authentication if type supported
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handler, ok := handlers[mfa_config.Type]
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if ok {
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return handler(req, d, resp)
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} else {
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return resp, err
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}
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}
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}
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