Open Source Openid Connect Server
An open source openid connect server lets you manage user logins and issue digital tokens. You run the service yourself to verify user identities across all your web apps. Most teams start by linking their server to an existing user directory. They then map team groups to broad role claims inside each token. When those roles are too wide, one login grants too much power across systems. How an open source openid connect server works The server sits between your users and your internal apps. Wh
Snyk Open Source + OpenID Connect (OIDC): the complete guide
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An open source openid connect server lets you manage user logins and issue digital tokens. You run the service yourself to verify user identities across all your web apps. Most teams start by linking their server to an existing user directory. They then map team groups to broad role claims inside each token. When those roles are too wide, one login grants too much power across systems.
How an open source openid connect server works
The server sits between your users and your internal apps. When a user tries to log in, the app sends them to the server. The server checks their password and second factor against a central user store. Once the user passes this check, the server builds three main items. It creates an ID token, an access token, and a refresh token.
The ID token is a signed JSON note that states who the user is. It holds basic facts like an email, a user ID, and group names. The server signs this token with a private key so apps can trust it. Your apps fetch the public key from a standard discovery URL to check signatures. This step proves that the login token came from your trusted server.
Teams often choose tools like Keycloak, Dex, or Ory Hydra for this job. Some tools include a full user database and login screens right out of the box. Other tools act as a bridge to upstream identity stores like LDAP or SAML. In both cases, you register each app as a client with a shared secret. You also set allowed callback URLs so tokens only go to safe places.
Choosing the right token claims and scopes
Scopes tell the server which user facts to put inside the token. Standard scopes cover basic profile info like email and phone numbers. Custom scopes let you pass team roles or project names to the target app. You should keep token payloads small so they fit in standard web headers. If a user belongs to fifty groups, filter the list before minting the token.
Token lifetime is another key setting you must tune with care. Access tokens should expire after a few minutes to limit the risk of theft. Refresh tokens last longer and let the app ask for a new access token. If someone leaves the team, you revoke their refresh token on the server. Once the short access token expires, the user can no longer log in.
Snyk Open Source + OpenID Connect (OIDC): architecture patterns and best practices
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What identity tokens solve and what they miss
Running your own identity server solves the problem of scattered user passwords. You get one place to enforce strong passwords and two-factor checks for everyone. Apps do not need to store password hashes or build their own login forms. They just check the token signature and read the user role from the payload.
Still, an identity server only checks who a person is at login time. Once the user gets inside a database or server, the token step is over. The identity server cannot see which SQL queries or shell commands the user runs. It cannot block a bad drop table command or require approval for a write action. It also cannot mask sensitive fields like card numbers or national IDs in query results. Static group roles inside a token are too blunt for live session control.
Add runtime guardrails and masking beside your databases and APIs
Login rules, role grants, and CI checks govern who connects to your stack. Yet any allowed script, engineer, or AI agent still runs commands with the full scope of its role. For workloads on Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes, SSH, or internal HTTP services, hoop.dev sits beside the service as an open-source proxy, a sidecar for your database or API.
Before a query runs, hoop.dev guardrails check the statement against your rules. An AI Analyzer you configure can score intent or hold risky calls for human review. Next, hoop.dev data masking rewrites sensitive fields in responses, and each verdict is logged per listener. Explore the MIT-licensed project on GitHub.
Frequently asked questions
What is the difference between OAuth 2.0 and OpenID Connect?
OAuth 2.0 is a framework that lets apps ask for permission to use resources. OpenID Connect sits on top of OAuth 2.0 to verify who the user is. It adds the standard ID token and a user info endpoint for login checks.
How do apps verify tokens from the server?
The server publishes its public keys at a well-known JSON web key URL. Apps download these keys and check the digital signature on every incoming token. Apps also check that the token has not expired and matches their client ID.
Should I store user passwords inside the OIDC server?
You can store passwords there, or you can link to an existing user directory. Many teams use a connector tool that delegates password checks to a single source. This setup avoids syncing passwords across multiple user stores.