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userauth.go
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userauth.go
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package coderd
import (
"context"
"database/sql"
"errors"
"fmt"
"net/http"
"strconv"
"strings"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/google/go-github/v43/github"
"github.com/google/uuid"
"golang.org/x/oauth2"
"golang.org/x/xerrors"
"github.com/coder/coder/coderd/database"
"github.com/coder/coder/coderd/httpapi"
"github.com/coder/coder/coderd/httpmw"
"github.com/coder/coder/codersdk"
)
// GithubOAuth2Team represents a team scoped to an organization.
type GithubOAuth2Team struct {
Organization string
Slug string
}
// GithubOAuth2Provider exposes required functions for the Github authentication flow.
type GithubOAuth2Config struct {
httpmw.OAuth2Config
AuthenticatedUser func(ctx context.Context, client *http.Client) (*github.User, error)
ListEmails func(ctx context.Context, client *http.Client) ([]*github.UserEmail, error)
ListOrganizationMemberships func(ctx context.Context, client *http.Client) ([]*github.Membership, error)
TeamMembership func(ctx context.Context, client *http.Client, org, team, username string) (*github.Membership, error)
AllowSignups bool
AllowOrganizations []string
AllowTeams []GithubOAuth2Team
}
func (api *API) userAuthMethods(rw http.ResponseWriter, r *http.Request) {
httpapi.Write(r.Context(), rw, http.StatusOK, codersdk.AuthMethods{
Password: true,
Github: api.GithubOAuth2Config != nil,
OIDC: api.OIDCConfig != nil,
})
}
func (api *API) userOAuth2Github(rw http.ResponseWriter, r *http.Request) {
var (
ctx = r.Context()
state = httpmw.OAuth2(r)
)
oauthClient := oauth2.NewClient(ctx, oauth2.StaticTokenSource(state.Token))
memberships, err := api.GithubOAuth2Config.ListOrganizationMemberships(ctx, oauthClient)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching authenticated Github user organizations.",
Detail: err.Error(),
})
return
}
var selectedMembership *github.Membership
for _, membership := range memberships {
if membership.GetState() != "active" {
continue
}
for _, allowed := range api.GithubOAuth2Config.AllowOrganizations {
if *membership.Organization.Login != allowed {
continue
}
selectedMembership = membership
break
}
}
if selectedMembership == nil {
httpapi.Write(ctx, rw, http.StatusUnauthorized, codersdk.Response{
Message: "You aren't a member of the authorized Github organizations!",
})
return
}
ghUser, err := api.GithubOAuth2Config.AuthenticatedUser(ctx, oauthClient)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching authenticated Github user.",
Detail: err.Error(),
})
return
}
// The default if no teams are specified is to allow all.
if len(api.GithubOAuth2Config.AllowTeams) > 0 {
var allowedTeam *github.Membership
for _, allowTeam := range api.GithubOAuth2Config.AllowTeams {
if allowTeam.Organization != *selectedMembership.Organization.Login {
// This needs to continue because multiple organizations
// could exist in the allow/team listings.
continue
}
allowedTeam, err = api.GithubOAuth2Config.TeamMembership(ctx, oauthClient, allowTeam.Organization, allowTeam.Slug, *ghUser.Login)
// The calling user may not have permission to the requested team!
if err != nil {
continue
}
}
if allowedTeam == nil {
httpapi.Write(ctx, rw, http.StatusUnauthorized, codersdk.Response{
Message: fmt.Sprintf("You aren't a member of an authorized team in the %s Github organization!", *selectedMembership.Organization.Login),
})
return
}
}
emails, err := api.GithubOAuth2Config.ListEmails(ctx, oauthClient)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching personal Github user.",
Detail: err.Error(),
})
return
}
var verifiedEmail *github.UserEmail
for _, email := range emails {
if email.GetVerified() && email.GetPrimary() {
verifiedEmail = email
break
}
}
if verifiedEmail == nil {
httpapi.Write(ctx, rw, http.StatusPreconditionRequired, codersdk.Response{
Message: "Your primary email must be verified on GitHub!",
})
return
}
cookie, err := api.oauthLogin(r, oauthLoginParams{
State: state,
LinkedID: githubLinkedID(ghUser),
LoginType: database.LoginTypeGithub,
AllowSignups: api.GithubOAuth2Config.AllowSignups,
Email: verifiedEmail.GetEmail(),
Username: ghUser.GetLogin(),
AvatarURL: ghUser.GetAvatarURL(),
})
var httpErr httpError
if xerrors.As(err, &httpErr) {
httpapi.Write(ctx, rw, httpErr.code, codersdk.Response{
Message: httpErr.msg,
Detail: httpErr.detail,
})
return
}
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Failed to process OAuth login.",
Detail: err.Error(),
})
return
}
http.SetCookie(rw, cookie)
redirect := state.Redirect
if redirect == "" {
redirect = "/"
}
http.Redirect(rw, r, redirect, http.StatusTemporaryRedirect)
}
type OIDCConfig struct {
httpmw.OAuth2Config
Verifier *oidc.IDTokenVerifier
// EmailDomain is the domain to enforce when a user authenticates.
EmailDomain string
AllowSignups bool
}
func (api *API) userOIDC(rw http.ResponseWriter, r *http.Request) {
var (
ctx = r.Context()
state = httpmw.OAuth2(r)
)
// See the example here: https://github.com/coreos/go-oidc
rawIDToken, ok := state.Token.Extra("id_token").(string)
if !ok {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "id_token not found in response payload. Ensure your OIDC callback is configured correctly!",
})
return
}
idToken, err := api.OIDCConfig.Verifier.Verify(ctx, rawIDToken)
if err != nil {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "Failed to verify OIDC token.",
Detail: err.Error(),
})
return
}
// "email_verified" is an optional claim that changes the behavior
// of our OIDC handler, so each property must be pulled manually out
// of the claim mapping.
claims := map[string]interface{}{}
err = idToken.Claims(&claims)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Failed to extract OIDC claims.",
Detail: err.Error(),
})
return
}
emailRaw, ok := claims["email"]
if !ok {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "No email found in OIDC payload!",
})
return
}
email, ok := emailRaw.(string)
if !ok {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: fmt.Sprintf("Email in OIDC payload isn't a string. Got: %t", emailRaw),
})
return
}
verifiedRaw, ok := claims["email_verified"]
if ok {
verified, ok := verifiedRaw.(bool)
if ok && !verified {
httpapi.Write(ctx, rw, http.StatusForbidden, codersdk.Response{
Message: fmt.Sprintf("Verify the %q email address on your OIDC provider to authenticate!", email),
})
return
}
}
usernameRaw, ok := claims["preferred_username"]
var username string
if ok {
username, _ = usernameRaw.(string)
}
// The username is a required property in Coder. We make a best-effort
// attempt at using what the claims provide, but if that fails we will
// generate a random username.
if !httpapi.UsernameValid(username) {
// If no username is provided, we can default to use the email address.
// This will be converted in the from function below, so it's safe
// to keep the domain.
if username == "" {
username = email
}
username = httpapi.UsernameFrom(username)
}
if api.OIDCConfig.EmailDomain != "" {
if !strings.HasSuffix(strings.ToLower(email), strings.ToLower(api.OIDCConfig.EmailDomain)) {
httpapi.Write(ctx, rw, http.StatusForbidden, codersdk.Response{
Message: fmt.Sprintf("Your email %q is not a part of the %q domain!", email, api.OIDCConfig.EmailDomain),
})
return
}
}
var picture string
pictureRaw, ok := claims["picture"]
if ok {
picture, _ = pictureRaw.(string)
}
cookie, err := api.oauthLogin(r, oauthLoginParams{
State: state,
LinkedID: oidcLinkedID(idToken),
LoginType: database.LoginTypeOIDC,
AllowSignups: api.OIDCConfig.AllowSignups,
Email: email,
Username: username,
AvatarURL: picture,
})
var httpErr httpError
if xerrors.As(err, &httpErr) {
httpapi.Write(ctx, rw, httpErr.code, codersdk.Response{
Message: httpErr.msg,
Detail: httpErr.detail,
})
return
}
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Failed to process OAuth login.",
Detail: err.Error(),
})
return
}
http.SetCookie(rw, cookie)
redirect := state.Redirect
if redirect == "" {
redirect = "/"
}
http.Redirect(rw, r, redirect, http.StatusTemporaryRedirect)
}
type oauthLoginParams struct {
State httpmw.OAuth2State
LinkedID string
LoginType database.LoginType
// The following are necessary in order to
// create new users.
AllowSignups bool
Email string
Username string
AvatarURL string
}
type httpError struct {
code int
msg string
detail string
}
func (e httpError) Error() string {
if e.detail != "" {
return e.detail
}
return e.msg
}
func (api *API) oauthLogin(r *http.Request, params oauthLoginParams) (*http.Cookie, error) {
var (
ctx = r.Context()
user database.User
)
err := api.Database.InTx(func(tx database.Store) error {
var (
link database.UserLink
err error
)
user, link, err = findLinkedUser(ctx, tx, params.LinkedID, params.Email)
if err != nil {
return xerrors.Errorf("find linked user: %w", err)
}
if user.ID == uuid.Nil && !params.AllowSignups {
return httpError{
code: http.StatusForbidden,
msg: fmt.Sprintf("Signups are not allowed for login type %q", params.LoginType),
}
}
if user.ID != uuid.Nil && user.LoginType != params.LoginType {
return httpError{
code: http.StatusForbidden,
msg: fmt.Sprintf("Incorrect login type, attempting to use %q but user is of login type %q",
params.LoginType,
user.LoginType,
),
}
}
// This can happen if a user is a built-in user but is signing in
// with OIDC for the first time.
if user.ID == uuid.Nil {
var organizationID uuid.UUID
organizations, _ := tx.GetOrganizations(ctx)
if len(organizations) > 0 {
// Add the user to the first organization. Once multi-organization
// support is added, we should enable a configuration map of user
// email to organization.
organizationID = organizations[0].ID
}
user, _, err = api.CreateUser(ctx, tx, CreateUserRequest{
CreateUserRequest: codersdk.CreateUserRequest{
Email: params.Email,
Username: params.Username,
OrganizationID: organizationID,
},
LoginType: params.LoginType,
})
if err != nil {
return xerrors.Errorf("create user: %w", err)
}
}
if link.UserID == uuid.Nil {
link, err = tx.InsertUserLink(ctx, database.InsertUserLinkParams{
UserID: user.ID,
LoginType: params.LoginType,
LinkedID: params.LinkedID,
OAuthAccessToken: params.State.Token.AccessToken,
OAuthRefreshToken: params.State.Token.RefreshToken,
OAuthExpiry: params.State.Token.Expiry,
})
if err != nil {
return xerrors.Errorf("insert user link: %w", err)
}
}
// LEGACY: Remove 10/2022.
// We started tracking linked IDs later so it's possible for a user to be a
// pre-existing OAuth user and not have a linked ID.
// The migration that added the user_links table could not populate
// the 'linked_id' field since it requires fields off the access token.
if link.LinkedID == "" {
link, err = tx.UpdateUserLinkedID(ctx, database.UpdateUserLinkedIDParams{
UserID: user.ID,
LoginType: params.LoginType,
LinkedID: params.LinkedID,
})
if err != nil {
return xerrors.Errorf("update user linked ID: %w", err)
}
}
if link.UserID != uuid.Nil {
link, err = tx.UpdateUserLink(ctx, database.UpdateUserLinkParams{
UserID: user.ID,
LoginType: params.LoginType,
OAuthAccessToken: params.State.Token.AccessToken,
OAuthRefreshToken: params.State.Token.RefreshToken,
OAuthExpiry: params.State.Token.Expiry,
})
if err != nil {
return xerrors.Errorf("update user link: %w", err)
}
}
needsUpdate := false
if user.AvatarURL.String != params.AvatarURL {
user.AvatarURL = sql.NullString{
String: params.AvatarURL,
Valid: true,
}
needsUpdate = true
}
// If the upstream email or username has changed we should mirror
// that in Coder. Many enterprises use a user's email/username as
// security auditing fields so they need to stay synced.
// NOTE: username updating has been halted since it can have infrastructure
// provisioning consequences (updates to usernames may delete persistent
// resources such as user home volumes).
if user.Email != params.Email {
user.Email = params.Email
needsUpdate = true
}
if needsUpdate {
// TODO(JonA): Since we're processing updates to a user's upstream
// email/username, it's possible for a different built-in user to
// have already claimed the username.
// In such cases in the current implementation this user can now no
// longer sign in until an administrator finds the offending built-in
// user and changes their username.
user, err = tx.UpdateUserProfile(ctx, database.UpdateUserProfileParams{
ID: user.ID,
Email: user.Email,
Username: user.Username,
UpdatedAt: database.Now(),
AvatarURL: user.AvatarURL,
})
if err != nil {
return xerrors.Errorf("update user profile: %w", err)
}
}
return nil
})
if err != nil {
return nil, xerrors.Errorf("in tx: %w", err)
}
cookie, err := api.createAPIKey(ctx, createAPIKeyParams{
UserID: user.ID,
LoginType: params.LoginType,
RemoteAddr: r.RemoteAddr,
})
if err != nil {
return nil, xerrors.Errorf("create API key: %w", err)
}
return cookie, nil
}
// githubLinkedID returns the unique ID for a GitHub user.
func githubLinkedID(u *github.User) string {
return strconv.FormatInt(u.GetID(), 10)
}
// oidcLinkedID returns the uniqued ID for an OIDC user.
// See https://openid.net/specs/openid-connect-core-1_0.html#ClaimStability .
func oidcLinkedID(tok *oidc.IDToken) string {
return strings.Join([]string{tok.Issuer, tok.Subject}, "||")
}
// findLinkedUser tries to find a user by their unique OAuth-linked ID.
// If it doesn't not find it, it returns the user by their email.
func findLinkedUser(ctx context.Context, db database.Store, linkedID string, emails ...string) (database.User, database.UserLink, error) {
var (
user database.User
link database.UserLink
)
link, err := db.GetUserLinkByLinkedID(ctx, linkedID)
if err != nil && !errors.Is(err, sql.ErrNoRows) {
return user, link, xerrors.Errorf("get user auth by linked ID: %w", err)
}
if err == nil {
user, err = db.GetUserByID(ctx, link.UserID)
if err != nil {
return database.User{}, database.UserLink{}, xerrors.Errorf("get user by id: %w", err)
}
if !user.Deleted {
return user, link, nil
}
// If the user was deleted, act as if no account link exists.
user = database.User{}
}
for _, email := range emails {
user, err = db.GetUserByEmailOrUsername(ctx, database.GetUserByEmailOrUsernameParams{
Email: email,
})
if err != nil && !errors.Is(err, sql.ErrNoRows) {
return user, link, xerrors.Errorf("get user by email: %w", err)
}
if errors.Is(err, sql.ErrNoRows) {
continue
}
break
}
if user.ID == uuid.Nil {
// No user found.
return database.User{}, database.UserLink{}, nil
}
// LEGACY: This is annoying but we have to search for the user_link
// again except this time we search by user_id and login_type. It's
// possible that a user_link exists without a populated 'linked_id'.
link, err = db.GetUserLinkByUserIDLoginType(ctx, database.GetUserLinkByUserIDLoginTypeParams{
UserID: user.ID,
LoginType: user.LoginType,
})
if err != nil && !errors.Is(err, sql.ErrNoRows) {
return database.User{}, database.UserLink{}, xerrors.Errorf("get user link by user id and login type: %w", err)
}
return user, link, nil
}