146 lines
6.3 KiB
Markdown
146 lines
6.3 KiB
Markdown
google_auth_proxy
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=================
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A reverse proxy that provides authentication using Google OAuth2 to validate
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individual accounts, or a whole google apps domain.
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[](http://travis-ci.org/bitly/google_auth_proxy)
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## Architecture
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```
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_______ ___________________ __________
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|Nginx| ----> |google_auth_proxy| ----> |upstream|
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------- ------------------- ----------
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||
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\/
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[google oauth2 api]
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```
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## Installation
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1. Download [Prebuilt Binary](https://github.com/bitly/google_auth_proxy/releases) or build from `master` with `$ go get github.com/bitly/google_auth_proxy` which should put the binary in `$GOROOT/bin`
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2. Register an OAuth Application with Google
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3. Configure Google Auth Proxy using config file, command line options, or environment variables
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4. Deploy behind a SSL endpoint (example provided for Nginx)
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## OAuth Configuration
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You will need to register an OAuth application with google, and configure it with Redirect URI(s) for the domain you
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intend to run `google_auth_proxy` on.
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1. Create a new project: https://console.developers.google.com/project
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2. Under "APIs & Auth", choose "Credentials"
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3. Now, choose "Create new Client ID"
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* The Application Type should be **Web application**
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* Enter your domain in the Authorized Javascript Origins `https://internal.yourcompany.com`
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* Enter the correct Authorized Redirect URL `https://internal.yourcompany.com/oauth2/callback`
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* NOTE: `google_auth_proxy` will _only_ callback on the path `/oauth2/callback`
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4. Under "APIs & Auth" choose "Consent Screen"
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* Fill in the necessary fields and Save (this is _required_)
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5. Take note of the **Client ID** and **Client Secret**
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## Configuration
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`google_auth_proxy` can be configured via [config file](#config-file), [command line options](#command-line-options) or [environment variables](#environment-variables).
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### Config File
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An example [google_auth_proxy.cfg](contrib/google_auth_proxy.cfg.example) config file is in the contrib directory. It can be used by specifying `-config=/etc/google_auth_proxy.cfg`
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### Command Line Options
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```
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Usage of google_auth_proxy:
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-authenticated-emails-file="": authenticate against emails via file (one per line)
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-client-id="": the Google OAuth Client ID: ie: "123456.apps.googleusercontent.com"
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-client-secret="": the OAuth Client Secret
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-config="": path to config file
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-cookie-domain="": an optional cookie domain to force cookies to (ie: .yourcompany.com)*
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-cookie-expire=168h0m0s: expire timeframe for cookie
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-cookie-httponly=true: set HttpOnly cookie flag
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-cookie-https-only=true: set secure (HTTPS) cookies (deprecated. use --cookie-secure setting)
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-cookie-secret="": the seed string for secure cookies
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-cookie-secure=true: set secure (HTTPS) cookie flag
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-custom-templates-dir="": path to custom html templates
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-display-htpasswd-form=true: display username / password login form if an htpasswd file is provided
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-google-apps-domain=: authenticate against the given Google apps domain (may be given multiple times)
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-htpasswd-file="": additionally authenticate against a htpasswd file. Entries must be created with "htpasswd -s" for SHA encryption
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-http-address="127.0.0.1:4180": [http://]<addr>:<port> or unix://<path> to listen on for HTTP clients
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-pass-basic-auth=true: pass HTTP Basic Auth, X-Forwarded-User and X-Forwarded-Email information to upstream
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-pass-host-header=true: pass the request Host Header to upstream
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-redirect-url="": the OAuth Redirect URL. ie: "https://internalapp.yourcompany.com/oauth2/callback"
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-skip-auth-regex=: bypass authentication for requests path's that match (may be given multiple times)
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-upstream=: the http url(s) of the upstream endpoint. If multiple, routing is based on path
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-version=false: print version string
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```
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### Environment variables
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The environment variables `GOOGLE_AUTH_PROXY_CLIENT_ID`, `GOOGLE_AUTH_PROXY_CLIENT_SECRET`, `GOOGLE_AUTH_PROXY_COOKIE_SECRET`, `GOOGLE_AUTH_PROXY_COOKIE_DOMAIN` and `GOOGLE_AUTH_PROXY_COOKIE_EXPIRE` can be used in place of the corresponding command-line arguments.
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### Example Nginx Configuration
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This example has a [Nginx](http://nginx.org/) SSL endpoint proxying to `google_auth_proxy` on port `4180`.
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`google_auth_proxy` then authenticates requests for an upstream application running on port `8080`. The external
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endpoint for this example would be `https://internal.yourcompany.com/`.
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An example Nginx config follows. Note the use of `Strict-Transport-Security` header to pin requests to SSL
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via [HSTS](http://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security):
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```
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server {
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listen 443 default ssl;
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server_name internal.yourcompany.com;
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ssl_certificate /path/to/cert.pem;
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ssl_certificate_key /path/to/cert.key;
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add_header Strict-Transport-Security max-age=1209600;
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location / {
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proxy_pass http://127.0.0.1:4180;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Scheme $scheme;
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proxy_connect_timeout 1;
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proxy_send_timeout 30;
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proxy_read_timeout 30;
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}
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}
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```
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The command line to run `google_auth_proxy` would look like this:
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```bash
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./google_auth_proxy \
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--google-apps-domain="yourcompany.com" \
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--upstream=http://127.0.0.1:8080/ \
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--cookie-secret=... \
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--cookie-secure=true \
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--client-id=... \
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--client-secret=...
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```
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## Endpoint Documentation
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Google Auth Proxy responds directly to the following endpoints. All other endpoints will be proxied upstream when authenticated.
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* /ping - returns an 200 OK response
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* /oauth2/sign_in - the login page, which also doubles as a sign out page (it clears cookies)
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* /oauth2/start - a URL that will redirect to start the OAuth cycle
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* /oauth2/callback - the URL used at the end of the OAuth cycle. The oauth app will be configured with this ass the callback url.
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## Logging Format
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Google Auth Proxy logs requests to stdout in a format similar to Apache Combined Log.
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```
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<REMOTE_ADDRESS> - <user@domain.com> [19/Mar/2015:17:20:19 -0400] <HOST_HEADER> GET <UPSTREAM_HOST> "/path/" HTTP/1.1 "<USER_AGENT>" <RESPONSE_CODE> <RESPONSE_BYTES> <REQUEST_DURATION>
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````
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