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oidc.go
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oidc.go
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//go:build !windows
package vaultkv
import (
"errors"
"fmt"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"syscall"
"time"
"github.com/hashicorp/cap/util"
"github.com/hashicorp/go-secure-stdlib/base62"
)
// AuthOIDCMetadata is the metadata member set by AuthOIDC
type AuthOIDCMetadata struct {
AuthURL string `json:"auth_url"`
}
// authHalts are the signals we want to interrupt our auth callback on.
// SIGTSTP is omitted for Windows.
var authHalts = []os.Signal{os.Interrupt, os.Kill, syscall.SIGTSTP}
// AuthOIDC is a shorthand for AuthOIDCMount against the default OIDC mountpoint,
// 'OIDC'.
func (v *Client) AuthOIDC(username, password string) (ret *AuthOutput, err error) {
return v.AuthOIDCMount("OIDC")
}
type loginResponse struct {
authOutput *AuthOutput
err error
}
// AuthOIDCMount submits the given username and password to the OIDC auth endpoint
// mounted at the given mountpoint, checking it against existing OIDC auth
// configurations. If auth is successful, then the AuthOutput object is returned,
// and this client's AuthToken is set to the returned token. Given mountpoint is
// relative to /v1/auth.
func (v *Client) AuthOIDCMount(mount string) (ret *AuthOutput, err error) {
// handle ctrl-c while waiting for the callback
sigintCh := make(chan os.Signal, 1)
signal.Notify(sigintCh, authHalts...)
defer signal.Stop(sigintCh)
raw := &authOutputRaw{}
authURL, clientNonce, err := fetchAuthURL(v, mount)
if err != nil {
return nil, err
}
doneCh := make(chan loginResponse)
http.HandleFunc("/oidc/callback", callbackHandler(v, mount, clientNonce, doneCh))
port := "8250"
listenAddress := "localhost"
listener, err := net.Listen("tcp", listenAddress+":"+port)
if err != nil {
return nil, err
}
defer listener.Close()
fmt.Fprintf(os.Stderr, "Complete the login via your OIDC provider. Launching browser to:\n\n %s\n\n\n", authURL)
if err := util.OpenURL(authURL); err != nil {
return nil, fmt.Errorf("failed to launch the browser , err=%w", err)
}
fmt.Fprintf(os.Stderr, "Waiting for OIDC authentication to complete...\n")
// Start local server
go func() {
err := http.Serve(listener, nil)
if err != nil && err != http.ErrServerClosed {
doneCh <- loginResponse{nil, err}
}
}()
// Wait for either the callback to finish, or a halt signal (e.g., SIGKILL, SIGINT, SIGTSTP) to be received or up to 2 minutes
select {
case s := <-doneCh:
return s.authOutput, s.err
case <-sigintCh:
return nil, errors.New("Interrupted")
case <-time.After(2 * time.Minute):
return nil, errors.New("Timed out waiting for response from provider")
}
ret = raw.toFinal(AuthOIDCMetadata{})
v.AuthToken = ret.ClientToken
return
}
func fetchAuthURL(v *Client, mount string) (string, string, error) {
//var authURL string
clientNonce, err := base62.Random(20)
if err != nil {
return "", "", err
}
callbackPort := "8250"
callbackMethod := "http"
callbackHost := "localhost"
redirectURI := fmt.Sprintf("%s://%s:%s/oidc/callback", callbackMethod, callbackHost, callbackPort)
data := map[string]interface{}{
// only default role is supported
//"role": role,
"redirect_uri": redirectURI,
"client_nonce": clientNonce,
}
raw := &authOutputRaw{}
err = v.doRequest(
"POST",
fmt.Sprintf("auth/%s/oidc/auth_url", mount),
data,
&raw,
)
if err != nil {
return "", "", err
}
authUrl := raw.Data["auth_url"].(string)
return authUrl, clientNonce, err
}
func callbackHandler(v *Client, mount string, clientNonce string, doneCh chan<- loginResponse) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
var response string
var authOutput *AuthOutput
var err error
defer func() {
w.Write([]byte(response))
doneCh <- loginResponse{authOutput, err}
}()
// TODO: consider checking for method for post for additional auth step if required
raw := &authOutputRaw{}
query := url.Values{}
query.Add("state", req.FormValue("state"))
query.Add("code", req.FormValue("code"))
query.Add("id_token", req.FormValue("id_token"))
query.Add("client_nonce", clientNonce)
err = v.doRequest(
"GET",
fmt.Sprintf("auth/%s/oidc/callback", mount),
query,
&raw,
)
authOutput = &AuthOutput{}
authOutput.ClientToken = raw.Auth.ClientToken
successHtml := `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
font-family: Arial, sans-serif;
text-align: center;
padding: 50px;
}
h1 {
color: #4CAF50;
}
p {
color: #333;
}
</style>
</head>
<body>
<h1>Success!</h1>
<p>Your request was successful.</p>
</body>
</html>`
errorHtml := `
<!DOCTYPE html>
<html lang="en">
<head>
<title>500 Internal Server Error</title>
</head>
<body>
<h1>500 Internal Server Error</h1>
<p>Something went wrong on our end. We're working on fixing it, and we'll be back as soon as possible.</p>
<p>In the meantime, please try again later.</p>
</body>
</html>`
if err != nil {
fmt.Println("Error calling back to vault", err.Error())
response = errorHtml
} else {
response = successHtml
}
}
}