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auth0.go
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auth0.go
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package auth0
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"html"
"io/ioutil"
"net/http"
"net/url"
"regexp"
"strings"
"github.com/PuerkitoBio/goquery"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/tidwall/gjson"
"github.com/versent/saml2aws/v2/pkg/cfg"
"github.com/versent/saml2aws/v2/pkg/creds"
"github.com/versent/saml2aws/v2/pkg/prompter"
"github.com/versent/saml2aws/v2/pkg/provider"
)
const (
connectionInfoJSURLFmt = "https://cdn.auth0.com/client/%s.js"
authOriginURLFmt = "https://%s.auth0.com"
authSubmitURLFmt = "https://%s.auth0.com/usernamepassword/login"
)
var logger = logrus.WithField("provider", "auth0")
var (
authURLPattern = regexp.MustCompile(`https://([^.]+)\.auth0\.com/samlp/(.+)`)
connectionInfoPattern = regexp.MustCompile(`Auth0\.setClient\((.*)\)`)
sessionInfoPattern = regexp.MustCompile(`window\.atob\('(.*)'\)`)
defaultPrompter = prompter.NewCli()
)
// Client wrapper around Auth0.
type Client struct {
provider.ValidateBase
client *provider.HTTPClient
}
// authInfo represents Auth0 first auth request
type authInfo struct {
clientID string
tenant string
connection string
state string
csrf string
connectionInfoURLFmt string
authOriginURLFmt string
authSubmitURLFmt string
}
// authRequest represents Auth0 request
type authRequest struct {
ClientID string `json:"client_id"`
Connection string `json:"connection"`
Password string `json:"password"`
PopupOptions interface{} `json:"popup_options"`
Protocol string `json:"protocol"`
RedirectURI string `json:"redirect_uri"`
ResponseType string `json:"response_type"`
Scope string `json:"scope"`
SSO bool `json:"sso"`
State string `json:"state"`
Tenant string `json:"tenant"`
Username string `json:"username"`
CSRF string `json:"_csrf"`
Intstate string `json:"_intstate"`
}
// clientInfo represents Auth0 client information
type clientInfo struct {
id string
tenantName string
}
// sessionInfo represents Auth0 session information
type sessionInfo struct {
state string
csrf string
}
// authCallbackRequest represents Auth0 authentication callback request
type authCallbackRequest struct {
method string
url string
body string
}
type authInfoOption func(*authInfo)
func defaultAuthInfoOptions() authInfoOption {
return func(ai *authInfo) {
ai.connectionInfoURLFmt = connectionInfoJSURLFmt
ai.authOriginURLFmt = authOriginURLFmt
ai.authSubmitURLFmt = authSubmitURLFmt
}
}
// New create a new Auth0 Client
func New(idpAccount *cfg.IDPAccount) (*Client, error) {
tr := provider.NewDefaultTransport(idpAccount.SkipVerify)
client, err := provider.NewHTTPClient(tr, provider.BuildHttpClientOpts(idpAccount))
if err != nil {
return nil, errors.Wrap(err, "error building http client")
}
client.CheckResponseStatus = provider.SuccessOrRedirectResponseValidator
return &Client{
client: client,
}, nil
}
// Authenticate logs into Auth0 and returns a SAML response
func (ac *Client) Authenticate(loginDetails *creds.LoginDetails) (string, error) {
logger.Debug("Get connections and session tokens")
authInfo, err := ac.buildAuthInfo(loginDetails.URL, defaultPrompter)
if err != nil {
return "", errors.Wrap(err, "error failed to build authentication info")
}
logger.Debug("Get SAML Assertion")
formHTML, err := ac.doLogin(loginDetails, authInfo)
if err != nil {
return "", errors.Wrap(err, "error failed to fetch SAML")
}
logger.Debug("Extract SAML Assertion")
samlAssertion, err := mustFindInputByName(formHTML, "SAMLResponse")
if err != nil {
return "", errors.Wrap(err, "error failed to parse SAML")
}
logger.WithField("data", samlAssertion).Debug("SAML Assertion (base64 encoded)")
return samlAssertion, nil
}
func (ac *Client) buildAuthInfo(
loginURL string,
prompter prompter.Prompter,
opts ...authInfoOption,
) (*authInfo, error) {
var ai authInfo
if len(opts) == 0 {
opts = []authInfoOption{defaultAuthInfoOptions()}
}
for _, opt := range opts {
opt(&ai)
}
ci, err := extractClientInfo(loginURL)
if err != nil {
return nil, errors.Wrap(err, "error extractClientInfo")
}
connectionNames, err := ac.getConnectionNames(fmt.Sprintf(ai.connectionInfoURLFmt, ci.id))
if err != nil {
return nil, errors.Wrap(err, "error getConnectionNames")
}
var connection string
switch {
case len(connectionNames) == 0:
return nil, errors.New("error connection name")
case len(connectionNames) == 1:
connection = connectionNames[0]
default:
index := prompter.Choose("Select connection", connectionNames)
connection = connectionNames[index]
}
si, err := ac.fetchSessionInfo(loginURL)
if err != nil {
return nil, errors.Wrap(err, "error fetchSessionInfo")
}
ai.clientID = ci.id
ai.tenant = ci.tenantName
ai.connection = connection
ai.state = si.state
ai.csrf = si.csrf
logger.WithFields(logrus.Fields{
"Connection": ai.connection,
"StateToken": ai.state,
"CSRFToken": ai.csrf,
}).Debug("Connection and Tokens")
return &ai, nil
}
func (ac *Client) fetchSessionInfo(loginURL string) (*sessionInfo, error) {
req, err := http.NewRequest("GET", loginURL, nil)
if err != nil {
return nil, errors.Wrap(err, "error building request")
}
resp, err := ac.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error retrieving response")
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrap(err, "error retrieving response body")
}
defer resp.Body.Close()
respBodyStr := string(respBody)
logger.WithField("data", respBodyStr).Debug("Auth0 login form")
tokenEncoded := sessionInfoPattern.FindStringSubmatch(respBodyStr)
if len(tokenEncoded) < 1 {
return nil, errors.New("error response doesn't match")
}
jsonByte, err := base64.StdEncoding.DecodeString(tokenEncoded[1])
if err != nil {
return nil, errors.Wrap(err, "error decoding matcher part by base64")
}
state := gjson.Get(string(jsonByte), "state").String()
csrf := gjson.Get(string(jsonByte), "_csrf").String()
if len(state) == 0 || len(csrf) == 0 {
return nil, errors.New("error response doesn't include session info")
}
return &sessionInfo{
state: state,
csrf: csrf,
}, nil
}
func (ac *Client) getConnectionNames(connectionInfoURL string) ([]string, error) {
req, err := http.NewRequest("GET", connectionInfoURL, nil)
if err != nil {
return nil, errors.Wrap(err, "error building request")
}
resp, err := ac.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "error retrieving response")
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrap(err, "error retrieving body from response")
}
defer resp.Body.Close()
respBodyStr := string(respBody)
logger.WithField("data", respBodyStr).Debug("Tenant connection mapping")
match := connectionInfoPattern.FindStringSubmatch(respBodyStr)
if len(match) < 2 {
return nil, errors.New("cannot find connection name")
}
var connectionNames []string
result := gjson.Get(match[1], `strategies.#.connections.#.name`)
for _, ary := range result.Array() {
for _, name := range ary.Array() {
connectionNames = append(connectionNames, name.String())
}
}
return connectionNames, nil
}
func (ac *Client) doLogin(loginDetails *creds.LoginDetails, ai *authInfo) (string, error) {
logger.Debug("Login to Auth0")
responseDoc, err := ac.loginAuth0(loginDetails, ai)
if err != nil {
return "", errors.Wrap(err, "error failed to login Auth0")
}
logger.Debug("Parse response HTML")
authCallback, err := parseResponseForm(responseDoc)
if err != nil {
return "", errors.Wrap(err, "error parse response document")
}
logger.Debug("Request to auth callback")
resp, err := ac.doAuthCallback(authCallback, ai)
if err != nil {
return "", errors.Wrap(err, "error failed to make callback")
}
return resp, nil
}
func (ac *Client) loginAuth0(loginDetails *creds.LoginDetails, ai *authInfo) (string, error) {
authReq := authRequest{
ClientID: ai.clientID,
Connection: ai.connection,
Password: loginDetails.Password,
PopupOptions: "{}",
Protocol: "samlp",
RedirectURI: "https://signin.aws.amazon.com/saml",
ResponseType: "code",
Scope: "openid profile email",
SSO: true,
State: ai.state,
Tenant: ai.tenant,
Username: loginDetails.Username,
CSRF: ai.csrf,
Intstate: "deprecated",
}
authBody := new(bytes.Buffer)
err := json.NewEncoder(authBody).Encode(authReq)
if err != nil {
return "", errors.Wrap(err, "error encoding authentication request")
}
authSubmitURL := fmt.Sprintf(ai.authSubmitURLFmt, ai.tenant)
req, err := http.NewRequest("POST", authSubmitURL, authBody)
if err != nil {
return "", errors.Wrap(err, "error building authentication request")
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Origin", fmt.Sprintf(ai.authOriginURLFmt, ai.tenant))
req.Header.Add(
"Auth0-Client",
base64.StdEncoding.EncodeToString(
[]byte(`{"name":"lock.js","version":"11.11.0","lib_version":{"raw":"9.8.1"}}`),
),
)
resp, err := ac.client.Do(req)
if err != nil {
return "", errors.Wrap(err, "error retrieving auth response")
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", errors.Wrap(err, "error retrieving body from response")
}
defer resp.Body.Close()
respBodyStr := string(respBody)
logger.WithField("data", respBodyStr).Debug("Callback HTML")
return respBodyStr, nil
}
func (ac *Client) doAuthCallback(authCallback *authCallbackRequest, ai *authInfo) (string, error) {
req, err := http.NewRequest(authCallback.method, authCallback.url, strings.NewReader(authCallback.body))
if err != nil {
return "", errors.Wrap(err, "error building authentication callback request")
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Origin", fmt.Sprintf(ai.authOriginURLFmt, ai.tenant))
resp, err := ac.client.Do(req)
if err != nil {
return "", errors.Wrap(err, "error retrieving auth callback response")
}
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", errors.Wrap(err, "error retrieving body from response")
}
defer resp.Body.Close()
respBodyStr := string(respBody)
logger.WithField("data", respBodyStr).Debug("Auth callback response")
return respBodyStr, nil
}
func extractClientInfo(url string) (*clientInfo, error) {
matches := authURLPattern.FindStringSubmatch(url)
if len(matches) < 3 {
return nil, errors.New("error invalid Auth0 URL")
}
return &clientInfo{
id: matches[2],
tenantName: matches[1],
}, nil
}
func parseResponseForm(responseForm string) (*authCallbackRequest, error) {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(responseForm))
if err != nil {
return nil, errors.Wrap(err, "error build goquery error")
}
form := doc.Find("form")
methodDownCase, ok := form.Attr("method")
if !ok {
return nil, errors.New("invalid form method")
}
authCallbackURL, ok := form.Attr("action")
if !ok {
return nil, errors.New("invalid form action")
}
authCallBackForm := url.Values{}
input := doc.Find("input")
input.Each(func(_ int, selection *goquery.Selection) {
name, nameOk := selection.Attr("name")
value, valueOk := selection.Attr("value")
if nameOk && valueOk {
authCallBackForm.Add(name, html.UnescapeString(value))
}
})
authCallbackBody := authCallBackForm.Encode()
if len(authCallbackBody) == 0 {
return nil, errors.New("invalid input values")
}
authCallBackReq := &authCallbackRequest{
method: strings.ToUpper(methodDownCase),
url: authCallbackURL,
body: authCallbackBody,
}
logger.WithField("data", authCallBackReq).Debug("Auth callback")
return authCallBackReq, nil
}
func mustFindInputByName(formHTML string, name string) (string, error) {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(formHTML))
if err != nil {
return "", errors.Wrap(err, "error parse document")
}
var fieldValue string
doc.Find(fmt.Sprintf(`input[name="%s"]`, name)).Each(
func(i int, s *goquery.Selection) {
val, _ := s.Attr("value")
fieldValue = val
},
)
if len(fieldValue) == 0 {
return "", errors.New("error unable to get value")
}
return fieldValue, nil
}