mirror of
https://github.com/Luzifer/nginx-sso.git
synced 2024-12-30 01:31:18 +00:00
Knut Ahlers
9b66d15c6a
This change allows to use the specified `username_attribute` in a search for group members. This can especially be useful in case the `uid` is used as the `username_attribute` and also in `member` or `uniqueMember` attribute of groups instead of the DN.
278 lines
12 KiB
Markdown
278 lines
12 KiB
Markdown
[](https://goreportcard.com/report/github.com/Luzifer/nginx-sso)
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# Luzifer / nginx-sso
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This program is intended to be used within the [`ngx_http_auth_request_module`](https://nginx.org/en/docs/http/ngx_http_auth_request_module.html) of nginx to provide a single-sign-on for a domain using one central authentication directory.
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## Usage
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You can use the `luzifer/nginx-sso` docker image to start your SSO service. On first start an example configuration will be generated and after you've changed that configuration you can start the container:
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```
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# docker run -d -p 127.0.0.1:8082:8082 -v /data/sso-config:/data luzifer/nginx-sso
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```
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After you did this you need to configure your nginx to use the SSO service:
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```nginx
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server {
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listen 443 ssl;
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server_name kibana.hub.luzifer.io;
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ssl_certificate /data/ssl/certs/luzifer.io.pem;
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ssl_certificate_key /data/ssl/certs/luzifer.io.key;
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# Redirect the user to the login page when they are not logged in
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error_page 401 = @error401;
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location / {
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# Protect this location using the auth_request
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auth_request /sso-auth;
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## Optionally set a header to pass through the username
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#auth_request_set $username $upstream_http_x_username;
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#proxy_set_header X-User $username;
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# Automatically renew SSO cookie on request
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auth_request_set $cookie $upstream_http_set_cookie;
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add_header Set-Cookie $cookie;
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proxy_pass http://127.0.0.1:1720/;
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}
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location /sso-auth {
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# Do not allow requests from outside
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internal;
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# Access /auth endpoint to query login state
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proxy_pass http://127.0.0.1:8082/auth;
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# Do not forward the request body (nginx-sso does not care about it)
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proxy_pass_request_body off;
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proxy_set_header Content-Length "";
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# Set custom information for ACL matching: Each one is available as
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# a field for matching: X-Host = x-host, ...
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proxy_set_header X-Original-URI $request_uri;
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proxy_set_header X-Host $http_host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_set_header X-Application "kibana";
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}
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# Define where to send the user to login and specify how to get back
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location @error401 {
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# Another server{} directive also proxying to http://127.0.0.1:8082
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return 302 https://login.luzifer.io/login?go=$scheme://$http_host$request_uri;
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}
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}
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```
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## Configuration
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The configuration is mainly done using a YAML configuration file. Some options are configurable through command line flags and can be looked up using `--help` flag.
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For an example configuration see the [`config.yaml`](config.yaml) file in this repository. Within the next sections the options are explained in more detail:
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### Main configuration: Login form
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The login form can be customized with its wording and the default login method.
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```yaml
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login:
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title: "luzifer.io - Login"
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default_method: "simple"
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names:
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simple: "Username / Password"
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yubikey: "Yubikey"
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```
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Most options should explain themselves, the `names` dictionary maps IDs of the authentication methods (shown in the title of their config section below) to human readable strings. You can set any string you need and your user recognizes.
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### Main configuration: Cookie Settings
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Most of the cookie settings are pre-set to sane defaults but you definitly need to configure some.
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```yaml
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cookie:
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domain: ".example.com"
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authentication_key: "Ff1uWJcLouKu9kwxgbnKcU3ps47gps72sxEz79TGHFCpJNCPtiZAFDisM4MWbstH"
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expire: 3600 # Optional, default: 3600
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prefix: "nginx-sso" # Optional, default: nginx-sso
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secure: true # Optional, default: false
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```
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Adjust the `domain` to your service. So if all of your services live under `*.luzifer.io` you want to set the domain to `.luzifer.io`. The `authentication_key` needs to be set to some unique string not known to others. It is used to validate nobody messed with your session cookies. If this is leaked (or you just used the default) attackers can just set any username inside the corresponding cookie and are able to access your services!
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If you are accessing your services through HTTPs you want to enable `secure` cookies. Also you should think about customizing the cookie `prefix` and the `expire` time of the cookie.
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### Main configuration: HTTP Listener
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This section configures where you can reach the program using HTTP and where you will point your nginx to. The example below shows the defaults and you don't need to change them.
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```yaml
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listen:
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addr: "127.0.0.1"
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port: 8082
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```
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Pay attention if you are running the docker container you need to change the IP to `0.0.0.0` to expose the port in the container. If you miss this the service will not be available.
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### Main configuration: ACL
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The rules of the ACL are the most complex part of the configuration and you should take your time to make this bullet-proof. If you mess up you're probably are getting complaints from your users because the default policy applied is to `deny` all access. So in the end you are configuring a white-list here.
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```yaml
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acl:
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rule_sets:
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- rules:
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- field: "host"
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equals: "test.example.com"
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- field: "x-origin-uri"
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regexp: "^/api"
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allow: ["luzifer", "@admins"]
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```
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Each `rule_sets` entry consists of three parts: `rules`, `allow` and `deny` directives. You can supply as many rules as you need, they are connected using AND logic per rule-set.
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Each `rules` entry has two mandantory and three optional fields of which at least one *must* be set:
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- `field` - required - Selector of the header your nginx is sending to the `/auth` endpoint (e.g. `Host`, `X-Origin-URI`, ...)
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- `invert` - required - Boolean used to invert the matching: What was true will be false. Useful for "does not match this regexp" rules (default: `false`)
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- `present` - optional - Boolean stating a certain header must exist or must not exist
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- `regexp` - optional - String containing a regexp which must match the contents of the header selected by `field`
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- `equals` - optional - String which must fully match the contents of the header selected by `field`
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The `allow` and `deny` directives are arrays of users and groups. Groups are prefixed using an `@` sign. There is a simple logic: Users before groups, denies before allows. So if you allow the group `@test` containing the user `mike` but deny the user `mike`, mike will not be able to access the matching sites.
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### Provider configuration: Atlassian Crowd (`crowd`)
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The crowd auth provider connects nginx-sso with an Atlassian Crowd directory server. The SSO authentication cookie used by Jira and Confluence is also used by nginx-sso which means a login in Jira will also perform a login on nginx-sso and vice versa.
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```yaml
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providers:
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crowd:
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url: "https://crowd.example.com/crowd/"
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app_name: ""
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app_pass: ""
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```
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The configuration is quite simple: Create an application in Crowd, enter the Crowd URL and the application credentials into the config and you're done.
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### Provider configuration: LDAP Auth (`ldap`)
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The LDAP provider connects to a (remote) LDAP directory server and authenticates users against and reads groups from it.
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```yaml
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providers:
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ldap:
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enable_basic_auth: false
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manager_dn: "cn=admin,dc=example,dc=com"
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manager_password: ""
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root_dn: "dc=example,dc=com"
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server: "ldap://ldap.example.com"
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# Optional, defaults to root_dn
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user_search_base: ou=users,dc=example,dc=com
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# Optional, defaults to '(uid={0})'
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user_search_filter: ""
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# Optional, defaults to root_dn
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group_search_base: "ou=groups,dc=example,dc=com"
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# Optional, defaults to '(|(member={0})(uniqueMember={0}))'
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group_membership_filter: ""
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# Replace DN as the username with another attribute
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# Optional, defaults to "dn"
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username_attribute: "uid"
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```
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To use this provider you need to have a LDAP server set up and filled with users. The example (and default) config above assumes each of your users carries an `uid` attribute and groups does contains `member` or `uniqueMember` attributes. Inside the groups full DNs are expected. For the ACL also full DNs are used.
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- `enable_basic_auth` - optional - Allows automated clients to pass credentials using basic auth instead of using the login form
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- `manager_dn` - required - A LDAP account which is allowed to list users and groups (it needs no access to the password!)
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- `manager_password` - required - The password for the `manager_dn`
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- `root_dn` - required - The base of your directory
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- `server` - required - Connection string to the LDAP server in format `ldap[s]://<host>[:<port>]`
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- `user_search_base` - optional - Using this parameter you can limit the user search to a certain sub-tree. Within this sub-tree the `uid` must be unique (as the name already states). If unset the `root_dn` is used here
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- `user_search_filter` - optional - The query to issue to find the user from its `uid` (`{0}` is replaced with the `uid`). If unset the query `(uid={0})` is used
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- `group_search_base` - optional - Like the `user_search_base` this limits the sub-tree where to search for groups, also defaults to `root_dn`
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- `group_membership_filter` - optional - The query to issue to list all groups the user is a member of. The DN of each group is used as the group name. If unset the query `(|(member={0})(uniqueMember={0}))` is used (`{0}` is replaced with the users DN, `{1}` is replaced with the content of the `username_attribute`)
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- `username_attribute` - optional - The attribute containing the username returned to nginx instead of the dn. If unset the `dn` is used
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When using the LDAP provider you need to pay attention when writing your ACL. As DNs are used as names for users and groups you also need to specify those in the ACL:
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```yaml
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acl:
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rule_sets:
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- rules:
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- field: "host"
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equals: "test.example.com"
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allow:
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- "cn=myuser,ou=users,dc=example,dc=com"
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- "@cn=mygroup,ou=groups,dc=example,dc=com"
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```
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### Provider configuration: Simple Auth (`simple`)
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The simple auth provider consists of a static mapping between users and passwords and groups and users. This can be seen as the replacement of htpasswd files.
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```yaml
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providers:
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simple:
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enable_basic_auth: false
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# Unique username mapped to bcrypt hashed password
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users:
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luzifer: "$2a$10$FSGAF8qDWX52aBID8.WpxOyCvfSQ3JIUVFiwyd1jolb4jM3BzJmNu"
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mike: "$2a$10$/0nrpYkdVhAifCLCI1DTz.4CkbCkc8CsvYhfvBRIhTTQDfBrkJ8Re"
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# Groupname to users mapping
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groups:
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admins: ["luzifer"]
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users: ["mike"]
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```
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You can see how to configure the provider the example above: No surprises, just ensure you are using bcrypt hashes for the passwords, no other hash functions are supported.
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If `enable_basic_auth` is set to `true` the credentials can also be submitted through basic auth. This is useful for services whose clients does not support other types of authentication.
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### Provider configuration: Token Auth (`token`)
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The token auth provider is intended to give machines access to endpoints. Users will not be able to "login" using tokens when they see the login form.
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```yaml
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providers:
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token:
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# Mapping of unique token names to the token
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tokens:
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tokenname: "MYTOKEN"
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mycli: "kQHjQLuQdkSPwdJ1mueniLMPSjCc6GVt"
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# Groupname to token mapping
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groups:
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mytokengroup: ["tokenname"]
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```
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When accessing the sites using a token this header is expected:
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`Authorization: Token MYTOKEN`
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### Provider configuration: Yubikey One-Factor-Auth (`yubikey`)
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The Yubikey auth provider is a one-factor-authentication mechanism. Not to be confused by U2F or HOTP two-factor methods. Your users only need to press the button to fully login. (Be sure you know what you're doing here!)
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```yaml
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providers:
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yubikey:
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# Get your client / secret from https://upgrade.yubico.com/getapikey/
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client_id: "12345"
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secret_key: "foobar"
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# First 12 characters of the OTP string mapped to the username
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devices:
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ccccccfcvuul: "luzifer"
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# Groupname to users mapping
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groups:
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admins: ["luzifer"]
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```
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You need to configure the `client_id` and the `secret_key` for the Yubico online validation service and the Yubikeys need to comply the specifications of that API (do not put random values into the device ID). Afterwards just take the first 12 characters of the keys OTP and map it to an user.
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