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cmd.go
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cmd.go
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package oauth
import (
"bufio"
"bytes"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"net/url"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/smallstep/cli/exec"
"github.com/smallstep/cli/flags"
"github.com/smallstep/cli/utils"
"github.com/urfave/cli"
"go.step.sm/cli-utils/command"
"go.step.sm/cli-utils/errs"
"go.step.sm/crypto/jose"
"go.step.sm/crypto/randutil"
)
// These are the OAuth2.0 client IDs from the Step CLI. This application is
// using the OAuth2.0 flow for installed applications described on
// https://developers.google.com/identity/protocols/OAuth2InstalledApp
//
// The Step CLI app and these client IDs do not have any APIs or services are
// enabled and it should be only used for OAuth 2.0 authorization.
//
// Due to the fact that the app cannot keep the client_secret confidential,
// incremental authorization with installed apps are not supported by Google.
//
// Google is also distributing the client ID and secret on the cloud SDK
// available here https://cloud.google.com/sdk/docs/quickstarts
const (
//nolint:gosec // This is a client meant for open source testing. The client has no security access or roles.
defaultClientID = "1087160488420-8qt7bavg3qesdhs6it824mhnfgcfe8il.apps.googleusercontent.com"
//nolint:gosec // This is a client meant for open source testing. The client has no security access or roles.
defaultClientNotSoSecret = "udTrOT3gzrO7W9fDPgZQLfYJ"
//nolint:gosec // This is a client meant for open source testing. The client has no security access or roles.
defaultDeviceAuthzClientID = "1087160488420-1u0jqoulmv3mfomfh6fhkfs4vk4bdjih.apps.googleusercontent.com"
//nolint:gosec // This is a client meant for open source testing. The client has no security access or roles.
defaultDeviceAuthzClientNotSoSecret = "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"
defaultDeviceAuthzInterval = 5
defaultDeviceAuthzExpiresIn = time.Minute * 5
// The URN for getting verification token offline
oobCallbackUrn = "urn:ietf:wg:oauth:2.0:oob"
// The URN for token request grant type jwt-bearer
//nolint:gosec // This is a resource identifier (not a secret).
jwtBearerUrn = "urn:ietf:params:oauth:grant-type:jwt-bearer"
)
type token struct {
AccessToken string `json:"access_token"`
IDToken string `json:"id_token"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int `json:"expires_in"`
TokenType string `json:"token_type"`
Err string `json:"error,omitempty"`
ErrDesc string `json:"error_description,omitempty"`
Scope string `json:"scope,omitempty"`
}
func init() {
cmd := cli.Command{
Name: "oauth",
Usage: "authorization and single sign-on using OAuth & OIDC",
UsageText: `**step oauth**
[**--provider**=<provider>] [**--client-id**=<client-id> **--client-secret**=<client-secret>]
[**--scope**=<scope> ...] [**--bare** [**--oidc**]] [**--header** [**--oidc**]]
[**--prompt**=<prompt>] [**--auth-param**=<key=value>]
**step oauth**
**--authorization-endpoint**=<authorization-endpoint>
**--token-endpoint**=<token-endpoint>
**--client-id**=<client-id> **--client-secret**=<client-secret>
[**--scope**=<scope> ...] [**--bare** [**--oidc**]] [**--header** [**--oidc**]]
[**--prompt**=<prompt>] [**--auth-param**=<key=value>]
**step oauth** [**--account**=<account>]
[**--authorization-endpoint**=<authorization-endpoint>]
[**--token-endpoint**=<token-endpoint>]
[**--scope**=<scope> ...] [**--bare** [**--oidc**]] [**--header** [**--oidc**]]
[**--prompt**=<prompt>] [**--auth-param**=<key=value>]
**step oauth** **--account**=<account> **--jwt**
[**--scope**=<scope> ...] [**--header**] [**-bare**] [**--prompt**=<prompt>]
[**--auth-param**=<key=value>]`,
Description: `**step oauth** command implements the OAuth 2.0 authorization flow.
OAuth is an open standard for access delegation, commonly used as a way for
Internet users to grant websites or applications access to their information on
other websites but without giving them the passwords. This mechanism is used by
companies such as Amazon, Google, Facebook, Microsoft and Twitter to permit the
users to share information about their accounts with third party applications or
websites. Learn more at https://en.wikipedia.org/wiki/OAuth.
This command by default performs the authorization flow with a preconfigured
Google application, but a custom one can be set combining the flags
**--client-id**, **--client-secret**, and **--provider**. The provider value
must be set to the OIDC discovery document (.well-known/openid-configuration)
endpoint. If Google is used this flag is not necessary, but the appropriate
value would be be https://accounts.google.com or
https://accounts.google.com/.well-known/openid-configuration
## EXAMPLES
Do the OAuth 2.0 flow using the default client:
'''
$ step oauth
'''
Redirect to localhost instead of 127.0.0.1:
'''
$ step oauth --listen localhost:0
'''
Redirect to a fixed port instead of random one:
'''
$ step oauth --listen :10000
'''
Redirect to a fixed url but listen on all the interfaces:
'''
$ step oauth --listen 0.0.0.0:10000 --listen-url http://127.0.0.1:10000
'''
Get just the access token:
'''
$ step oauth --bare
'''
Get just the OIDC token:
'''
$ step oauth --oidc --bare
'''
Use a custom OAuth2.0 server:
'''
$ step oauth --client-id my-client-id --client-secret my-client-secret \
--provider https://example.org
'''
Use the Device Authorization Grant flow for input constrained clients:
'''
$ step oauth --client-id my-client-id --client-secret my-client-secret --console-flow device
'''
Use the Out Of Band flow for input constrained clients:
'''
$ step oauth --client-id my-client-id --client-secret my-client-secret --console-flow oob
'''
Use the default OAuth flow for input constrained clients:
'''
$ step oauth --client-id my-client-id --client-secret my-client-secret --console
'''
Use additional authentication parameters:
'''
$ step oauth --client-id my-client-id --client-secret my-client-secret \
--provider https://example.org --auth-param "access_type=offline"
'''`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "provider, idp",
Usage: "OAuth provider for authentication",
Value: "google",
},
cli.StringFlag{
Name: "email, e",
Usage: "Email to authenticate",
},
cli.BoolFlag{
Name: "console, c",
Usage: `Complete the flow while remaining only inside the terminal.
This flag defaults to use the Device Authorization Grant flow.`,
},
cli.StringFlag{
Name: "console-flow",
Usage: `The alternative OAuth <flow> to use for input constrained devices.
: <console-flow> is a case-insensitive string and must be one of:
**device**
: Use the Device Authorization Grant (https://datatracker.ietf.org/doc/html/rfc8628#section-3.2) flow
**oob**
: Use the Out of Band (OOB) flow`,
},
cli.StringFlag{
Name: "client-id",
Usage: "OAuth Client ID",
},
cli.StringFlag{
Name: "client-secret",
Usage: "OAuth Client Secret",
},
cli.StringFlag{
Name: "account",
Usage: "JSON file containing account details",
},
cli.StringFlag{
Name: "authorization-endpoint",
Usage: "OAuth Authorization Endpoint",
},
cli.StringFlag{
Name: "device-authorization-endpoint",
Usage: "OAuth Device Authorization Endpoint",
},
cli.StringFlag{
Name: "token-endpoint",
Usage: "OAuth Token Endpoint",
},
cli.BoolFlag{
Name: "header",
Usage: "Output HTTP Authorization Header (suitable for use with curl)",
},
cli.BoolFlag{
Name: "oidc",
Usage: "Output OIDC Token instead of OAuth Access Token",
},
cli.BoolFlag{
Name: "bare",
Usage: "Only output the token",
},
cli.StringSliceFlag{
Name: "scope",
Usage: "OAuth scopes",
},
cli.StringSliceFlag{
Name: "auth-param",
Usage: `OAuth additional authentication parameters to include as part of the URL query.
Use this flag multiple times to add multiple parameters. This flag expects a
'key' and 'value' in the format '--auth-param "key=value"'.`,
},
cli.StringFlag{
Name: "prompt",
Usage: `Whether the Authorization Server prompts the End-User for reauthentication and consent.
OpenID standard defines the following values, but your provider may support some or none of them:
**none**
: The Authorization Server MUST NOT display any authentication or consent user interface pages.
An error is returned if an End-User is not already authenticated or the Client does not have
pre-configured consent for the requested Claims or does not fulfill other conditions for
processing the request.
**login**
: The Authorization Server SHOULD prompt the End-User for reauthentication. If it cannot
reauthenticate the End-User, it MUST return an error, typically login_required.
**consent**
: The Authorization Server SHOULD prompt the End-User for consent before returning information
to the Client. If it cannot obtain consent, it MUST return an error, typically consent_required.
**select_account**
: The Authorization Server SHOULD prompt the End-User to select a user account. This enables an
End-User who has multiple accounts at the Authorization Server to select amongst the multiple
accounts that they might have current sessions for. If it cannot obtain an account selection
choice made by the End-User, it MUST return an error, typically account_selection_required.
`,
},
cli.BoolFlag{
Name: "jwt",
Usage: "Generate a JWT Auth token instead of an OAuth Token (only works with service accounts)",
},
cli.StringFlag{
Name: "listen",
Usage: "Callback listener <address> (e.g. \":10000\")",
},
cli.StringFlag{
Name: "listen-url",
Usage: "The redirect_uri <url> in the authorize request (e.g. \"http://127.0.0.1:10000\")",
},
cli.BoolFlag{
Name: "implicit",
Usage: "Uses the implicit flow to authenticate the user. Requires **--insecure** and **--client-id** flags.",
Hidden: true,
},
cli.StringFlag{
Name: "browser",
Usage: "Path to browser for OAuth flow (macOS only).",
Hidden: true,
},
flags.RedirectURL,
flags.InsecureHidden,
},
Action: oauthCmd,
}
command.Register(cmd)
}
type consoleFlow int
const (
oobConsoleFlow consoleFlow = iota
deviceConsoleFlow
)
type options struct {
Provider string
Email string
Console bool
ConsoleFlow consoleFlow
Implicit bool
CallbackListener string
CallbackListenerURL string
CallbackPath string
TerminalRedirect string
Browser string
}
// Validate validates the options.
func (o *options) Validate() error {
if o.Provider != "google" && o.Provider != "github" && !strings.HasPrefix(o.Provider, "https://") {
return errors.New("use a valid provider: google or github")
}
if o.CallbackListener != "" {
if _, _, err := net.SplitHostPort(o.CallbackListener); err != nil {
return errors.Wrapf(err, "invalid value '%s' for flag '--listen'", o.CallbackListener)
}
}
if o.CallbackListenerURL != "" {
u, err := url.Parse(o.CallbackListenerURL)
if err != nil || u.Scheme == "" {
return errors.Wrapf(err, "invalid value '%s' for flag '--listen-url'", o.CallbackListenerURL)
}
if u.Path != "" {
o.CallbackPath = u.Path
}
}
return nil
}
func oauthCmd(c *cli.Context) error {
opts := &options{
Provider: c.String("provider"),
Email: c.String("email"),
Console: c.Bool("console"),
Implicit: c.Bool("implicit"),
CallbackListener: c.String("listen"),
CallbackListenerURL: c.String("listen-url"),
CallbackPath: "/",
TerminalRedirect: c.String("redirect-url"),
Browser: c.String("browser"),
}
if err := opts.Validate(); err != nil {
return err
}
if (opts.Provider != "google" || c.IsSet("authorization-endpoint")) && !c.IsSet("client-id") {
return errors.New("flag '--client-id' required with '--provider'")
}
isOOBFlow, isDeviceFlow := false, false
consoleFlowInput := c.String("console-flow")
switch {
case strings.EqualFold(consoleFlowInput, "device"):
opts.Console = true
opts.ConsoleFlow = deviceConsoleFlow
isDeviceFlow = true
case strings.EqualFold(consoleFlowInput, "oob"):
opts.Console = true
opts.ConsoleFlow = oobConsoleFlow
isOOBFlow = true
case c.IsSet("console-flow"):
return errs.InvalidFlagValue(c, "console-flow", consoleFlowInput, "device, oob")
case c.Bool("console"):
isDeviceFlow = true
opts.ConsoleFlow = deviceConsoleFlow
}
var clientID, clientSecret string
switch {
case opts.Implicit:
if !c.Bool("insecure") {
return errs.RequiredInsecureFlag(c, "implicit")
}
if !c.IsSet("client-id") {
return errs.RequiredWithFlag(c, "implicit", "client-id")
}
case isDeviceFlow:
clientID = defaultDeviceAuthzClientID
clientSecret = defaultDeviceAuthzClientNotSoSecret
default:
clientID = defaultClientID
clientSecret = defaultClientNotSoSecret
}
if c.IsSet("client-id") {
clientID = c.String("client-id")
clientSecret = c.String("client-secret")
}
authzEp := ""
deviceAuthzEp := ""
tokenEp := ""
if c.IsSet("authorization-endpoint") {
if !c.IsSet("token-endpoint") {
return errors.New("flag '--authorization-endpoint' requires flag '--token-endpoint'")
}
opts.Provider = ""
authzEp = c.String("authorization-endpoint")
tokenEp = c.String("token-endpoint")
}
if c.IsSet("device-authorization-endpoint") {
if !c.IsSet("token-endpoint") {
return errors.New("flag '--device-authorization-endpoint' requires flag '--token-endpoint'")
}
opts.Provider = ""
deviceAuthzEp = c.String("device-authorization-endpoint")
tokenEp = c.String("token-endpoint")
}
do2lo := false
issuer := ""
// This code supports Google service accounts. Probably maybe also support JWKs?
if c.IsSet("account") {
opts.Provider = ""
filename := c.String("account")
b, err := os.ReadFile(filename)
if err != nil {
return errors.Wrapf(err, "error reading account from %s", filename)
}
account := make(map[string]interface{})
if err = json.Unmarshal(b, &account); err != nil {
return errors.Wrapf(err, "error reading %s: unsupported format", filename)
}
if _, ok := account["installed"]; ok {
details := account["installed"].(map[string]interface{})
authzEp = details["auth_uri"].(string)
tokenEp = details["token_uri"].(string)
clientID = details["client_id"].(string)
clientSecret = details["client_secret"].(string)
} else if accountType, ok := account["type"]; ok && accountType == "service_account" {
authzEp = account["auth_uri"].(string)
tokenEp = account["token_uri"].(string)
clientID = account["private_key_id"].(string)
clientSecret = account["private_key"].(string)
issuer = account["client_email"].(string)
do2lo = true
} else {
return errors.Wrapf(err, "error reading %s: unsupported account type", filename)
}
}
scope := "openid email"
if c.IsSet("scope") {
scope = strings.Join(c.StringSlice("scope"), " ")
}
prompt := ""
if c.IsSet("prompt") {
prompt = c.String("prompt")
}
authParams := url.Values{}
for _, keyval := range c.StringSlice("auth-param") {
parts := strings.SplitN(keyval, "=", 2)
var k, v string
switch len(parts) {
case 1:
k, v = parts[0], ""
case 2:
k, v = parts[0], parts[1]
default:
return errs.InvalidFlagValue(c, "auth-param", keyval, "")
}
if k == "" {
return errs.InvalidFlagValue(c, "auth-param", keyval, "")
}
authParams.Add(k, v)
}
o, err := newOauth(opts.Provider, clientID, clientSecret, authzEp, deviceAuthzEp, tokenEp, scope, prompt, authParams, opts)
if err != nil {
return err
}
var tok *token
switch {
case do2lo:
if c.Bool("jwt") {
tok, err = o.DoJWTAuthorization(issuer, scope)
} else {
tok, err = o.DoTwoLeggedAuthorization(issuer)
}
case isDeviceFlow:
tok, err = o.DoDeviceAuthorization()
case isOOBFlow:
tok, err = o.DoManualAuthorization()
default:
tok, err = o.DoLoopbackAuthorization()
}
if err != nil {
return err
}
if c.Bool("header") {
if c.Bool("oidc") {
fmt.Println("Authorization: Bearer", tok.IDToken)
} else {
fmt.Println("Authorization: Bearer", tok.AccessToken)
}
} else {
if c.Bool("bare") {
if c.Bool("oidc") {
fmt.Println(tok.IDToken)
} else {
fmt.Println(tok.AccessToken)
}
} else {
b, err := json.MarshalIndent(tok, "", " ")
if err != nil {
return errors.Wrapf(err, "error marshaling token data")
}
fmt.Println(string(b))
}
}
return nil
}
type oauth struct {
provider string
clientID string
clientSecret string
scope string
prompt string
loginHint string
redirectURI string
tokenEndpoint string
authzEndpoint string
deviceAuthzEndpoint string
userInfoEndpoint string // For testing
state string
codeChallenge string
nonce string
implicit bool
CallbackListener string
CallbackListenerURL string
CallbackPath string
terminalRedirect string
browser string
authParams url.Values
errCh chan error
tokCh chan *token
}
type endpoint struct {
authorization string
deviceAuthorization string
token string
userInfo string
}
var knownProviders = map[string]endpoint{
"google": {
authorization: "https://accounts.google.com/o/oauth2/v2/auth",
deviceAuthorization: "https://oauth2.googleapis.com/device/code",
token: "https://www.googleapis.com/oauth2/v4/token",
userInfo: "https://www.googleapis.com/oauth2/v3/userinfo",
},
"github": {
authorization: "https://github.com/login/oauth/authorize",
deviceAuthorization: "https://github.com/login/device/code",
token: "https://github.com/login/oauth/access_token",
userInfo: "https://api.github.com/user",
},
}
func newOauth(provider, clientID, clientSecret, authzEp, deviceAuthzEp, tokenEp, scope, prompt string, authParams url.Values, opts *options) (*oauth, error) {
state, err := randutil.Alphanumeric(32)
if err != nil {
return nil, err
}
challenge, err := randutil.Alphanumeric(64)
if err != nil {
return nil, err
}
nonce, err := randutil.Hex(64) // 256 bits
if err != nil {
return nil, err
}
// Check known providers
if p, ok := knownProviders[provider]; ok {
return &oauth{
provider: provider,
clientID: clientID,
clientSecret: clientSecret,
scope: scope,
prompt: prompt,
authzEndpoint: p.authorization,
deviceAuthzEndpoint: p.deviceAuthorization,
tokenEndpoint: p.token,
userInfoEndpoint: p.userInfo,
loginHint: opts.Email,
state: state,
codeChallenge: challenge,
nonce: nonce,
implicit: opts.Implicit,
CallbackListener: opts.CallbackListener,
CallbackListenerURL: opts.CallbackListenerURL,
CallbackPath: opts.CallbackPath,
terminalRedirect: opts.TerminalRedirect,
browser: opts.Browser,
authParams: authParams,
errCh: make(chan error),
tokCh: make(chan *token),
}, nil
}
userinfoEp := ""
isDeviceFlow := opts.Console && opts.ConsoleFlow == deviceConsoleFlow
if (isDeviceFlow && deviceAuthzEp == "" && tokenEp == "") || (!isDeviceFlow && authzEp == "" && tokenEp == "") {
d, err := disco(provider)
if err != nil {
return nil, err
}
if v, ok := d["device_authorization_endpoint"].(string); !ok && isDeviceFlow {
return nil, errors.New("missing or invalid 'device_authorization_endpoint' in provider metadata")
} else if ok {
deviceAuthzEp = v
}
if v, ok := d["authorization_endpoint"].(string); !ok && !isDeviceFlow {
return nil, errors.New("missing or invalid 'authorization_endpoint' in provider metadata")
} else if ok {
authzEp = v
}
v, ok := d["token_endpoint"].(string)
if !ok {
return nil, errors.New("missing or invalid 'token_endpoint' in provider metadata")
}
tokenEp, userinfoEp = v, v
}
return &oauth{
provider: provider,
clientID: clientID,
clientSecret: clientSecret,
scope: scope,
prompt: prompt,
authzEndpoint: authzEp,
deviceAuthzEndpoint: deviceAuthzEp,
tokenEndpoint: tokenEp,
userInfoEndpoint: userinfoEp,
loginHint: opts.Email,
state: state,
codeChallenge: challenge,
nonce: nonce,
implicit: opts.Implicit,
CallbackListener: opts.CallbackListener,
CallbackListenerURL: opts.CallbackListenerURL,
CallbackPath: opts.CallbackPath,
terminalRedirect: opts.TerminalRedirect,
browser: opts.Browser,
authParams: authParams,
errCh: make(chan error),
tokCh: make(chan *token),
}, nil
}
func disco(provider string) (map[string]interface{}, error) {
u, err := url.Parse(provider)
if err != nil {
return nil, err
}
// TODO: OIDC and OAuth specify two different ways of constructing this
// URL. This is the OIDC way. Probably want to try both. See
// https://tools.ietf.org/html/rfc8414#section-5
if !strings.Contains(u.Path, "/.well-known/openid-configuration") {
u.Path = path.Join(u.Path, "/.well-known/openid-configuration")
}
resp, err := http.Get(u.String())
if err != nil {
return nil, errors.Wrapf(err, "error retrieving %s", u.String())
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrapf(err, "error retrieving %s", u.String())
}
details := make(map[string]interface{})
if err = json.Unmarshal(b, &details); err != nil {
return nil, errors.Wrapf(err, "error reading %s: unsupported format", u.String())
}
return details, err
}
// postForm simulates http.PostForm but adds the header "Accept:
// application/json", without this header GitHub will use
// application/x-www-form-urlencoded.
func postForm(rawurl string, data url.Values) (*http.Response, error) {
req, err := http.NewRequest("POST", rawurl, strings.NewReader(data.Encode()))
if err != nil {
return nil, fmt.Errorf("create POST %s request failed: %w", rawurl, err)
}
// Prevents re-use of TCP connections between requests.
req.Close = true
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("Accept", "application/json")
return http.DefaultClient.Do(req)
}
// NewServer creates http server
func (o *oauth) NewServer() (*httptest.Server, error) {
if o.CallbackListener == "" {
return httptest.NewServer(o), nil
}
host, port, err := net.SplitHostPort(o.CallbackListener)
if err != nil {
return nil, err
}
if host == "" {
host = "127.0.0.1"
}
l, err := net.Listen("tcp", net.JoinHostPort(host, port))
if err != nil {
return nil, errors.Wrapf(err, "error listening on %s", o.CallbackListener)
}
srv := &httptest.Server{
Listener: l,
Config: &http.Server{
Handler: o,
ReadHeaderTimeout: 15 * time.Second,
},
}
srv.Start()
// Update server url to use for example http://localhost:port
if host != "127.0.0.1" {
_, p, err := net.SplitHostPort(l.Addr().String())
if err != nil {
return nil, errors.Wrapf(err, "error parsing %s", l.Addr().String())
}
srv.URL = "http://" + host + ":" + p
}
return srv, nil
}
// DoLoopbackAuthorization performs the log in into the identity provider
// opening a browser and using a redirect_uri in a loopback IP address
// (http://127.0.0.1:port or http://[::1]:port).
func (o *oauth) DoLoopbackAuthorization() (*token, error) {
srv, err := o.NewServer()
if err != nil {
return nil, err
}
// Update server url if --listen-url is set
if o.CallbackListenerURL != "" {
o.redirectURI = o.CallbackListenerURL
} else {
o.redirectURI = srv.URL
}
defer srv.Close()
// Get auth url and open it in a browser
authURL, err := o.Auth()
if err != nil {
return nil, err
}
if err := exec.OpenInBrowser(authURL, o.browser); err != nil {
fmt.Fprintln(os.Stderr, "Cannot open a web browser on your platform.")
fmt.Fprintln(os.Stderr)
fmt.Fprintln(os.Stderr, "Open a local web browser and visit:")
fmt.Fprintln(os.Stderr)
fmt.Fprintln(os.Stderr, authURL)
fmt.Fprintln(os.Stderr)
} else {
fmt.Fprintln(os.Stderr, "Your default web browser has been opened to visit:")
fmt.Fprintln(os.Stderr)
fmt.Fprintln(os.Stderr, authURL)
fmt.Fprintln(os.Stderr)
}
// Wait for response and return the token
select {
case tok := <-o.tokCh:
return tok, nil
case err := <-o.errCh:
return nil, err
case <-time.After(2 * time.Minute):
return nil, errors.New("oauth command timed out, please try again")
}
}
// DoManualAuthorization performs the log in into the identity provider
// allowing the user to open a browser on a different system and then entering
// the authorization code on the Step CLI.
func (o *oauth) DoManualAuthorization() (*token, error) {
o.redirectURI = oobCallbackUrn
authURL, err := o.Auth()
if err != nil {
return nil, err
}
fmt.Fprintln(os.Stderr, "Open a local web browser and visit:")
fmt.Fprintln(os.Stderr)
fmt.Fprintln(os.Stderr, authURL)
fmt.Fprintln(os.Stderr)
// Read from the command line
fmt.Fprint(os.Stderr, "Enter verification code: ")
code, err := utils.ReadString(os.Stdin)
if err != nil {
return nil, errors.WithStack(err)
}
tok, err := o.Exchange(o.tokenEndpoint, code)
if err != nil {
return nil, err
}
if tok.Err != "" || tok.ErrDesc != "" {
return nil, errors.Errorf("Error exchanging authorization code: %s. %s", tok.Err, tok.ErrDesc)
}
return tok, nil
}
type identifyDeviceResponse struct {
DeviceCode string `json:"device_code"`
UserCode string `json:"user_code"`
VerificationURI string `json:"verification_uri"`
// NOTE Google returns `verification_url` which is incorrect
// according to the spec (https://datatracker.ietf.org/doc/html/rfc8628#section-3.2)
// but we'll try to accommodate for that here.
VerificationURL string `json:"verification_url"`
VerificationURIComplete string `json:"verification_uri_complete"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
}
// DoDeviceAuthorization gets a token from the IDP using the OAuth 2.0
// Device Authorization Grant. https://datatracker.ietf.org/doc/html/rfc8628
func (o *oauth) DoDeviceAuthorization() (*token, error) {
// Identify the Device
data := url.Values{}
data.Set("client_id", o.clientID)
data.Set("client_secret", o.clientSecret)
data.Set("scope", o.scope)
resp, err := postForm(o.deviceAuthzEndpoint, data)
if err != nil {
return nil, errors.Wrap(err, "http failure to identify device")
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
var e struct {
Error string
}
if err := json.NewDecoder(bytes.NewReader(b)).Decode(&e); err != nil {
return nil, errors.Wrapf(err, "could not parse http body: %s", string(b))
}
}
var idr identifyDeviceResponse
if err := json.NewDecoder(bytes.NewReader(b)).Decode(&idr); err != nil {
return nil, errors.Wrap(err, "failure decoding device authz response to JSON")
}
switch {
case idr.VerificationURI != "":
// do nothing
case idr.VerificationURL != "":
// NOTE this is a hack for Google, because their API returns the attribute
// 'verification_url` rather than `verification_uri`.
idr.VerificationURI = idr.VerificationURL
default:
return nil, errors.Errorf("device code response from server missing 'verification_uri' parameter. http body response: %s", string(b))
}
if idr.Interval <= 0 {
idr.Interval = defaultDeviceAuthzInterval
}
fmt.Fprintf(os.Stderr, "Visit %s and enter the code: (press 'ENTER' to open default browser)\n", idr.VerificationURI)
fmt.Fprintln(os.Stderr, idr.UserCode)
go openBrowserIfAsked(o, idr.VerificationURI)
// Poll the Token endpoint until the user completes the flow.
data = url.Values{}
data.Set("client_id", o.clientID)
data.Set("client_secret", o.clientSecret)
data.Set("grant_type", "urn:ietf:params:oauth:grant-type:device_code")
data.Set("device_code", idr.DeviceCode)
endPollIn := defaultDeviceAuthzExpiresIn
if idr.ExpiresIn > 0 {
expiresIn := time.Duration(idr.ExpiresIn) * time.Second
if expiresIn < endPollIn {
endPollIn = expiresIn
}
}
t := time.NewTimer(endPollIn)
defer t.Stop()
for {
select {
case <-time.After(time.Duration(idr.Interval) * time.Second):
tok, err := o.deviceAuthzTokenPoll(data)
if errors.Is(err, errHTTPToken) {
continue
} else if err != nil {
return nil, err
}
return tok, nil
case <-t.C:
return nil, errors.New("device authorization grant expired")
}
}
}
func openBrowserIfAsked(o *oauth, u string) {
reader := bufio.NewReader(os.Stdin)
reader.ReadString('\n')
exec.OpenInBrowser(u, o.browser)
}
var errHTTPToken = errors.New("bad request; token not returned")
func (o *oauth) deviceAuthzTokenPoll(data url.Values) (*token, error) {
resp, err := postForm(o.tokenEndpoint, data)
if err != nil {
return nil, errors.Wrap(err, "error doing POST to /token endpoint")
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrap(err, "error reading HTTP response body from /token endpoint")
}
switch {
case resp.StatusCode == http.StatusOK:
tok := token{}
if err := json.NewDecoder(bytes.NewReader(b)).Decode(&tok); err != nil {
return nil, errors.Wrap(err, "error parsing JSON /token response")
}
return &tok, nil
case resp.StatusCode >= http.StatusBadRequest && resp.StatusCode < http.StatusInternalServerError:
return nil, errHTTPToken
default:
return nil, errors.New(string(b))
}
}
// DoTwoLeggedAuthorization performs two-legged OAuth using the jwt-bearer
// grant type.
func (o *oauth) DoTwoLeggedAuthorization(issuer string) (*token, error) {
pemBytes := []byte(o.clientSecret)
block, _ := pem.Decode(pemBytes)
if block == nil {
return nil, fmt.Errorf("failed to read private key pem block")
}
priv, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, errors.Wrap(err, "error parsing private key")
}
// Add claims
now := int(time.Now().Unix())
c := map[string]interface{}{
"aud": o.tokenEndpoint,
"nbf": now,
"iat": now,
"exp": now + 3600,
"iss": issuer,
"scope": o.scope,
}
so := new(jose.SignerOptions)