auth

Documentation

Overview

Package auth provides authentication related filters.

Basic - Check Basic Authentication

The filter accepts two parameters, the first mandatory one is the path to the htpasswd file usually used with Apache or nginx. The second one is the optional realm name that will be displayed in the browser. Each incoming request will be validated against the password file, for more information which formats are currently supported check "https://github.com/abbot/go-http-auth". Assuming that the MD5 version will be used, new entries can be generated like

htpasswd -nbm myName myPassword

Embedding the filter in routes:

generic: * -> basicAuth("/path/to/htpasswd") -> "https://internal.example.org";

myRealm: Host("my.example.org")
  -> basicAuth("/path/to/htpasswd", "My Website")
  -> "https://my-internal.example.org";

OAuth2 - Check Bearer Tokens

The auth filter takes the incoming request, and tries to extract the Bearer token from the Authorization header. Then it validates against a configured service. Depending on the settings, it also can check if the owner of the token belongs to a specific OAuth2 realm, and it can check if it has at least one of the predefined scopes. If any of the expectations are not met, it doesn't forward the request to the target endpoint, but returns with status 401.

OAuth2 - Provider Configuration - Tokeninfo

To enable OAuth2 tokeninfo filters you have to set the CLI argument -oauth2-tokeninfo-url=<OAuthTokeninfoURL>. Scopes and key value pairs depend on the OAuth2 tokeninfo provider. AccessTokens has to be accepted by your OAuth2 provider's TokeninfoURL. Filter names starting with oauthTokeninfo will work on the returned data from TokeninfoURL. The request from skipper to TokeninfoURL will use the query string to do the request: ?access_token=<access-token-from-authorization-header>.

Example json output of the tokeninfo response could be:

{
  "access_token": "<mytoken>",
  "client_id": "ztoken",
  "cn": "Jane Doe",
  "expires_in": "300",
  "grant_type": "password",
  "realm": "/employees",
  "scope": [
    "uid",
    "foo-r",
    "bar-w",
    "qux-rw"
  ],
  "token_type": "Bearer",
  "uid": "jdoe"
}

OAuth2 - oauthTokeninfoAnyScope filter

The filter oauthTokeninfoAnyScope allows access if one of the scopes is satisfied by the request.

a: Path("/a") -> oauthTokeninfoAnyScope("uid") -> "https://internal.example.org/";
b: Path("/b") -> oauthTokeninfoAnyScope("uid", "bar") -> "https://internal.example.org/";

OAuth - oauthTokeninfoAllScope() filter

The filter oauthTokeninfoAllScope allows access if all of the scopes are satisfied by the request:

a: Path("/a") -> oauthTokeninfoAllScope("uid") -> "https://internal.example.org/";
b: Path("/b") -> oauthTokeninfoAllScope("uid", "bar") -> "https://internal.example.org/";

OAuth - oauthTokeninfoAnyKV() filter

The filter oauthTokeninfoAnyKV allows access if the token information returned by OAuthTokeninfoURL has the given key and the given value.

The following route has a filter definition, that one of the keys "uid" or "foo" has the value "jdoe" or "bar". Additionally the second will check if there is a "realm" "/employees":

a: Path("/") -> oauthTokeninfoAnyKV("uid", "jdoe", "foo", "bar") -> "https://internal.example.org/";
b: Path("/") -> oauthTokeninfoAnyKV("realm","/employees", "uid", "jdoe", "foo", "bar") -> "https://internal.example.org/";

Example json output of this tokeninfo response:

{
  "access_token": "<mytoken>",
  "client_id": "ztoken",
  "cn": "Jane Doe",
  "expires_in": "300",
  "grant_type": "password",
  "realm": "/employees",
  "scope": [
    "uid",
    "foo-r",
    "bar-w",
    "qux-rw"
  ],
  "token_type": "Bearer",
  "uid": "jdoe"
}

OAuth - oauthTokeninfoAllKV() filter

The filter oauthTokeninfoAllKV allows access if the token information returned by OAuthTokeninfoURL has the given key and the given value.

The following route has a filter definition, that will check if all of the key value pairs match. Here "uid" has to have the value "jdoe" and "foo" has to have the value "bar". Additionally the second will check if there is a "realm" "/employees":

a: Path("/") -> oauthTokeninfoAllKV("uid", jdoe", "foo", "bar") -> "https://internal.example.org/";
b: Path("/") -> oauthTokeninfoAllKV("realm", "/employees", "uid", "jdoe", "foo", "bar") -> "https://internal.example.org/";

Example json output of this information response:

{
  "access_token": "<mytoken>",
  "client_id": "ztoken",
  "cn": "John Doe",
  "expires_in": "300",
  "grant_type": "password",
  "foo": "bar",
  "realm": "/employees",
  "scope": [
    "uid",
    "foo-r",
    "bar-w",
    "qux-rw"
  ],
  "token_type": "Bearer",
  "uid": "jdoe"
}

OAuth - auditLog() filter

The filter auditLog allows you to have an audit log for all requests. This filter should be always set, before checking with auth filters. To see only permitted access, you can set the auditLog() filter after the auth filter.

a: Path("/only-allowed-audit-log") -> oauthTokeninfoAnyScope("bar-w") -> auditLog() -> "https://internal.example.org/";
b: Path("/all-access-requests-audit-log") -> auditLog() -> oauthTokeninfoAnyScope("foo-r") -> "https://internal.example.org/";

Index

• Constants
• func NewBasicAuth() *basicSpec
• func NewOAuthTokeninfoAllKV(OAuthTokeninfoURL string) filters.Spec
• func NewOAuthTokeninfoAllScope(OAuthTokeninfoURL string) filters.Spec
• func NewOAuthTokeninfoAnyKV(OAuthTokeninfoURL string) filters.Spec
• func NewOAuthTokeninfoAnyScope(OAuthTokeninfoURL string) filters.Spec

Constants

const (
	Name                      = "basicAuth"
	ForceBasicAuthHeaderName  = "WWW-Authenticate"
	ForceBasicAuthHeaderValue = "Basic realm="
	DefaultRealmName          = "Basic Realm"
)

const (
	OAuthTokeninfoAnyScopeName = "oauthTokeninfoAnyScope"
	OAuthTokeninfoAllScopeName = "oauthTokeninfoAllScope"
	OAuthTokeninfoAnyKVName    = "oauthTokeninfoAnyKV"
	OAuthTokeninfoAllKVName    = "oauthTokeninfoAllKV"
	AuthUnknown                = "authUnknown"
)

Functions

func NewBasicAuth

func NewBasicAuth() *basicSpec

func NewOAuthTokeninfoAllKV

func NewOAuthTokeninfoAllKV(OAuthTokeninfoURL string) filters.Spec

NewOAuthTokeninfoAllKV creates a new auth filter specification to validate authorization for requests. Current implementation uses Bearer tokens to authorize requests and checks that the token contains all key value pairs provided.

func NewOAuthTokeninfoAllScope

func NewOAuthTokeninfoAllScope(OAuthTokeninfoURL string) filters.Spec

NewOAuthTokeninfoAllScope creates a new auth filter specification to validate authorization for requests. Current implementation uses Bearer tokens to authorize requests and checks that the token contains all scopes.

func NewOAuthTokeninfoAnyKV

func NewOAuthTokeninfoAnyKV(OAuthTokeninfoURL string) filters.Spec

NewOAuthTokeninfoAnyKV creates a new auth filter specification to validate authorization for requests. Current implementation uses Bearer tokens to authorize requests and checks that the token contains at least one key value pair provided.

func NewOAuthTokeninfoAnyScope

func NewOAuthTokeninfoAnyScope(OAuthTokeninfoURL string) filters.Spec

NewOAuthTokeninfoAnyScope creates a new auth filter specification to validate authorization for requests. Current implementation uses Bearer tokens to authorize requests and checks that the token contains at least one scope.