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pkce.go
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pkce.go
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package oidc
import (
"context"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"errors"
"fmt"
"net"
"net/http"
"strconv"
"strings"
"github.com/sirupsen/logrus"
"github.com/armadaproject/armada/internal/common/logging"
openId "github.com/coreos/go-oidc"
"golang.org/x/oauth2"
)
type PKCEDetails struct {
ProviderUrl string
ClientId string
LocalPort uint16
Scopes []string
}
func AuthenticatePkce(config PKCEDetails) (*TokenCredentials, error) {
ctx := context.Background()
log := logrus.StandardLogger().WithField("auth", "AuthenticatePkce")
result := make(chan *oauth2.Token)
errorResult := make(chan error)
provider, err := openId.NewProvider(ctx, config.ProviderUrl)
if err != nil {
return nil, err
}
localUrl := "localhost:" + strconv.Itoa(int(config.LocalPort))
oauth := oauth2.Config{
ClientID: config.ClientId,
Endpoint: provider.Endpoint(),
RedirectURL: "http://" + localUrl + "/auth/callback",
Scopes: append(config.Scopes, openId.ScopeOpenID),
}
state := randomStringBase64() // xss protection
challenge := randomStringBase64()
challengeSum := sha256.Sum256([]byte(challenge))
challengeSumEncoded := strings.Replace(base64.URLEncoding.EncodeToString(challengeSum[:]), "=", "", -1)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
loginUrl := oauth.AuthCodeURL(state,
oauth2.SetAuthURLParam("code_challenge", challengeSumEncoded),
oauth2.SetAuthURLParam("code_challenge_method", "S256"))
http.Redirect(w, r, loginUrl, http.StatusFound)
})
http.HandleFunc("/auth/callback", func(w http.ResponseWriter, r *http.Request) {
_, err := fmt.Fprint(w, "<h1>Please close this window.</h1>")
if err != nil {
errorResult <- err
return
}
if r.URL.Query().Get("state") != state {
errorResult <- errors.New("Wrong state!")
return
}
authError := r.URL.Query().Get("error")
if authError != "" {
authErrorDesc := r.URL.Query().Get("error_description")
errorResult <- fmt.Errorf("%s: %s", authError, authErrorDesc)
return
}
token, err := oauth.Exchange(ctx, r.URL.Query().Get("code"), oauth2.SetAuthURLParam("code_verifier", challenge))
if err != nil {
errorResult <- err
return
}
result <- token
})
listener, err := net.Listen("tcp", localUrl)
if err != nil {
panic(err)
}
defer listener.Close()
server := &http.Server{}
go func() {
if err := server.Serve(listener); err != nil {
logging.WithStacktrace(log, err).Error("unable to serve")
}
}()
cmd, err := openBrowser("http://" + localUrl)
defer func() {
if err := cmd.Process.Kill(); err != nil {
logging.WithStacktrace(log, err).Error("unable to kill process")
}
}()
if err != nil {
return nil, err
}
select {
case t := <-result:
return &TokenCredentials{oauth.TokenSource(ctx, t)}, nil
case e := <-errorResult:
return nil, e
}
}
func randomStringBase64() string {
b := make([]byte, 32)
_, err := rand.Read(b)
if err != nil {
panic(err)
}
return strings.Replace(base64.URLEncoding.EncodeToString(b), "=", "", -1)
}