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feat: support the OAuth2 device flow with GitHub for signing in (#16585)

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First PR in a series to address
https://github.com/coder/coder/issues/16230.

Introduces support for logging in via the [GitHub OAuth2 Device
Flow](https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/authorizing-oauth-apps#device-flow).

It's previously been possible to configure external auth with the device
flow, but it's not been possible to use it for logging in. This PR
builds on the existing support we had to extend it to sign ins.

When a user clicks "sign in with GitHub" when device auth is configured,
they are redirected to the new `/login/device` page, which makes the
flow possible from the client's side. The recording below shows the full
flow.


https://github.com/user-attachments/assets/90c06f1f-e42f-43e9-a128-462270c80fdd

I've also manually tested that it works for converting from
password-based auth to oauth.

Device auth can be enabled by a deployment's admin by setting the
`CODER_OAUTH2_GITHUB_DEVICE_FLOW` env variable or a corresponding config
setting.
This commit is contained in:
Hugo Dutka
2025-02-21 18:42:16 +01:00
committed by GitHub
parent 660746462e
commit 8c5e7007cd
24 changed files with 657 additions and 111 deletions
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76
coderd/userauth.go
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@ -748,12 +748,32 @@ type GithubOAuth2Config struct {
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)
DeviceFlowEnabled bool
ExchangeDeviceCode func(ctx context.Context, deviceCode string) (*oauth2.Token, error)
AuthorizeDevice func(ctx context.Context) (*codersdk.ExternalAuthDevice, error)
AllowSignups bool
AllowEveryone bool
AllowOrganizations []string
AllowTeams []GithubOAuth2Team
}
func (c *GithubOAuth2Config) Exchange(ctx context.Context, code string, opts ...oauth2.AuthCodeOption) (*oauth2.Token, error) {
if !c.DeviceFlowEnabled {
return c.OAuth2Config.Exchange(ctx, code, opts...)
}
return c.ExchangeDeviceCode(ctx, code)
}
func (c *GithubOAuth2Config) AuthCodeURL(state string, opts ...oauth2.AuthCodeOption) string {
if !c.DeviceFlowEnabled {
return c.OAuth2Config.AuthCodeURL(state, opts...)
}
// This is an absolute path in the Coder app. The device flow is orchestrated
// by the Coder frontend, so we need to redirect the user to the device flow page.
return "/login/device?state=" + state
}
// @Summary Get authentication methods
// @ID get-authentication-methods
// @Security CoderSessionToken
@ -786,6 +806,53 @@ func (api *API) userAuthMethods(rw http.ResponseWriter, r *http.Request) {
})
}
// @Summary Get Github device auth.
// @ID get-github-device-auth
// @Security CoderSessionToken
// @Produce json
// @Tags Users
// @Success 200 {object} codersdk.ExternalAuthDevice
// @Router /users/oauth2/github/device [get]
func (api *API) userOAuth2GithubDevice(rw http.ResponseWriter, r *http.Request) {
var (
ctx = r.Context()
auditor = api.Auditor.Load()
aReq, commitAudit = audit.InitRequest[database.APIKey](rw, &audit.RequestParams{
Audit: *auditor,
Log: api.Logger,
Request: r,
Action: database.AuditActionLogin,
})
)
aReq.Old = database.APIKey{}
defer commitAudit()
if api.GithubOAuth2Config == nil {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "Github OAuth2 is not enabled.",
})
return
}
if !api.GithubOAuth2Config.DeviceFlowEnabled {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "Device flow is not enabled for Github OAuth2.",
})
return
}
deviceAuth, err := api.GithubOAuth2Config.AuthorizeDevice(ctx)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Failed to authorize device.",
Detail: err.Error(),
})
return
}
httpapi.Write(ctx, rw, http.StatusOK, deviceAuth)
}
// @Summary OAuth 2.0 GitHub Callback
// @ID oauth-20-github-callback
// @Security CoderSessionToken
@ -1016,7 +1083,14 @@ func (api *API) userOAuth2Github(rw http.ResponseWriter, r *http.Request) {
}
redirect = uriFromURL(redirect)
http.Redirect(rw, r, redirect, http.StatusTemporaryRedirect)
if api.GithubOAuth2Config.DeviceFlowEnabled {
// In the device flow, the redirect is handled client-side.
httpapi.Write(ctx, rw, http.StatusOK, codersdk.OAuth2DeviceFlowCallbackResponse{
RedirectURL: redirect,
})
} else {
http.Redirect(rw, r, redirect, http.StatusTemporaryRedirect)
}
}
type OIDCConfig struct {