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fix(sso): default tokenEndpointAuthentication to client_secret_post #3627

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fix(sso): default tokenEndpointAuthentication to client_secret_post #3627

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4ba09f4
fix(sso): default tokenEndpointAuthentication to client_secret_post
minijeong-log Mar 17, 2026
f365e1e
fix(sso): use nullish coalescing and add env var for tokenEndpointAut…
minijeong-log Mar 17, 2026
ac0d326
docs(sso): add SSO_OIDC_TOKEN_ENDPOINT_AUTH to script usage comment
minijeong-log Mar 17, 2026
f3c1335
fix(sso): validate SSO_OIDC_TOKEN_ENDPOINT_AUTH env var value
minijeong-log Mar 17, 2026
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12 changes: 11 additions & 1 deletion packages/db/scripts/register-sso-provider.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
* SSO_OIDC_CLIENT_ID=your_client_id
* SSO_OIDC_CLIENT_SECRET=your_client_secret
* SSO_OIDC_SCOPES=openid,profile,email (optional)
* SSO_OIDC_TOKEN_ENDPOINT_AUTH=client_secret_post|client_secret_basic (optional, defaults to client_secret_post)
*
* SAML Providers:
* SSO_SAML_ENTRY_POINT=https://your-idp/sso
Expand Down Expand Up @@ -215,6 +216,11 @@ function buildSSOConfigFromEnv(): SSOProviderConfig | null {
pkce: process.env.SSO_OIDC_PKCE !== 'false',
authorizationEndpoint: process.env.SSO_OIDC_AUTHORIZATION_ENDPOINT,
tokenEndpoint: process.env.SSO_OIDC_TOKEN_ENDPOINT,
tokenEndpointAuthentication:
process.env.SSO_OIDC_TOKEN_ENDPOINT_AUTH === 'client_secret_post' ||
process.env.SSO_OIDC_TOKEN_ENDPOINT_AUTH === 'client_secret_basic'
? process.env.SSO_OIDC_TOKEN_ENDPOINT_AUTH
: undefined,
userInfoEndpoint: process.env.SSO_OIDC_USERINFO_ENDPOINT,
jwksEndpoint: process.env.SSO_OIDC_JWKS_ENDPOINT,
discoveryEndpoint:
Expand Down Expand Up @@ -507,7 +513,11 @@ async function registerSSOProvider(): Promise<boolean> {
clientSecret: ssoConfig.oidcConfig.clientSecret,
authorizationEndpoint: ssoConfig.oidcConfig.authorizationEndpoint,
tokenEndpoint: ssoConfig.oidcConfig.tokenEndpoint,
tokenEndpointAuthentication: ssoConfig.oidcConfig.tokenEndpointAuthentication,
// Default to client_secret_post: better-auth sends client_secret_basic
// credentials without URL-encoding per RFC 6749 §2.3.1, so '+' in secrets
// is decoded as space by OIDC providers, causing invalid_client errors.
tokenEndpointAuthentication:
ssoConfig.oidcConfig.tokenEndpointAuthentication ?? 'client_secret_post',
jwksEndpoint: ssoConfig.oidcConfig.jwksEndpoint,
pkce: ssoConfig.oidcConfig.pkce,
discoveryEndpoint:
Expand Down