middlewares

README

Gobis-middlewares

This is a set of middlewares created for gobis useable on your on project containing gobis.

Note: They are loaded by default on gobis-server

List:

• basic2token: Give the ability to connect an user over basic auth, retrieve a token from an oauth2 server with user information and forward the request with this token.
• basic auth
• casbin: An authorization library that supports access control models like ACL, RBAC, ABAC
• cef trace: Produce access log in CEF format for siem.
• cf check permission: Check if user has access to a service instance on a cloud foundry platform.
• circuit breaker
• conn limit
• cors
• infopage: Add an endpoint on upstream to see information like headers set by gobis and user informations set by middlewares (Useful for frontend)
• JWT
• oauth2
• oauth2request
• ldap
• secure: An HTTP middleware for Go that facilitates some quick security wins
• rate limit
• trace

Pro tip:

You can set multiple middleware params programmatically by using a dummy structure containing each config you wanna set, example:

package main
import (
    "github.com/orange-cloudfoundry/gobis-middlewares/trace"
    "github.com/orange-cloudfoundry/gobis-middlewares/cors"
    "github.com/orange-cloudfoundry/gobis"
)
func main(){
    configHandler := gobis.DefaultHandlerConfig{
            Routes: []gobis.ProxyRoute{
                {
                    Name: "myapi",
                    Path: "/app/**",
                    Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                    MiddlewareParams: struct {
                        trace.TraceConfig
                        cors.CorsConfig
                    }{
                        TraceConfig: trace.TraceConfig{
                            Trace: &trace.TraceOptions{
                                Enabled: true,
                            },
                        },
                        CorsConfig: cors.CorsConfig{
                            Cors: &cors.CorsOptions{
                                Enabled: true,
                            },
                        },
                    },
                },
            },
    }
    gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(trace.NewTrace(), cors.NewCors()))
}

Basic2Token

Give the ability to connect an user over basic auth, retrieve a token from an oauth2 server with user information and forward the request with this token.

This was made to transparently convert a basic auth authentication to an oauth2 one.

See godoc for Basic2TokenOptions to know more about parameters.

Note:

• Your oauth2 server must have the password grant type such as UAA or Gitlab in oauth2 provider

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/basic2token"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: basic2token.Basic2TokenConfig{
                        Ldap: &basic2token.Basic2TokenOptions{
                                Enable: true,
                                AccessTokenUri: "https://my.uaa.local/oauth/token",
                                ClientId: "cf",
                                ClientSecret: "",
                                ParamsAsJson: false,
                                UseRouteTransport: true,
                                InsecureSkipVerify: true,
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(basic2token.NewBasic2Token()))
// create your server

Use in config file

middleware_params:
  basic2token:
    enabled: true
    access_token_uri: https://my.uaa.local/oauth/token
    client_id: cf
    client_secret: ~
    params_as_json: false
    use_route_transport: false
    insecure_skip_verify: true

Tips

• If key scope is found in the response of the oauth2 server, thoses scopes will be loaded as groups and others middlewares will be able to find groups for the current user by using context groups
• Logged user is accessible by other middleware through context username

Credits

• https://github.com/goji/httpauth

Basic auth

Add basic auth to upstream

See godoc for BasicAuthOption to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/basicauth"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: basicauth.BasicAuthConfig{
                        BasicAuth: &basicauth.BasicAuthOptions{
                                {
                                        User: "user",
                                        Password: "$2y$12$AHKssZrkmcG2pmom.rvy2OMsV8HpMHHcRIEY158LgZIkrA0BFvFQq", // equal password
                                        Crypted: true, // hashed by bcrypt, you can use https://github.com/gibsjose/bcrypt-hash command to crypt a password
                                },
                                {
                                        User: "user2",
                                        Password: "mypassword",
                                        Groups: []string{"admin"}
                                },
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(basicauth.NewBasicAuth()))
// create your server

Use in config file

middleware_params:
  basic_auth:
  - user: user
    password: $2y$12$AHKssZrkmcG2pmom.rvy2OMsV8HpMHHcRIEY158LgZIkrA0BFvFQq # equal password
    crypted: true # hashed by bcrypt, you can use https://github.com/gibsjose/bcrypt-hash command to crypt a password
  - user: user2
    password: mypassword # equal password
    groups: [admin]

Tips

• By setting groups it will allow others middleware to find groups for the current user by using context groups
• If you use bcrypt more the cost will be higher more it will take time to test a password against it and will increase response time

Credits

• https://github.com/goji/httpauth

Casbin

casbin is an authorization library that supports access control models like ACL, RBAC, ABAC.

This middleware allow you to add access control over your apo

See godoc for CasbinOption to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/casbin"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: casbin.CasbinConfig{
                        CircuitBreaker: &casbin.CasbinOption{
                                Enabled: true,
                                Policies: []casbin.CasbinPolicy{
                                        Type: "p",
                                        Sub: "usernameOrGroupName",
                                        Obj: "/mysubpath/*"
                                        Act: "*",
                                },
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(casbin.NewCasbin()))
// create your server

Use in config file

middleware_params:
  casbin:
    enabled: true
    policies:
    - {type: p, sub: usernameOrGroupName, obj: /mysubpath/*, act: *}

Tips

• It will load as role policies all groups found by using context groups this allow you, if you use ldap middleware, to pass a group name found as a sub (e.g.: sub: myUserGroupName)
• It will also load all policies found in context key casbin.PolicyContextKey this allow other middleware to add their own policies

Credits

• https://github.com/casbin/casbin

CEF Trace

Produce access log in CEF format for siem.

See godoc for CefTraceOptions to know more about parameters.

Trace will take the form: CEF:0|device_vendor|device_product|device_version|my-sig|GET /path/request|0|rt=<unix timestamp> request=/path/request requestMethod=GET httpStatusCode=200 src=10.0.0.1 suser=user-gobis sgroups=group,gobis xForwardedFor=10.0.0.2

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/ceftrace"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: cf_checkpermission.CfCheckPermissionConfig{
                        CefTrace: &ceftrace.CefTraceOptions{
                                Enabled: true,
                                DeviceVendor: "device_vendor",
                                DeviceProduct: "device_product",
                                DeviceVersion: "device_version",
                                KeySignatureID: "my-sig",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(ceftrace.NewCefTrace()))
// create your server

Use in config file

middleware_params:
  cef_trace:
    enabled: true
    device_vendor: device_vendor
    device_product: device_product
    device_version: device_version
    key_signature_id: my-sig

Cf check permission

Check if user has access to a service instance on a cloud foundry platform.

See godoc for CorsOptions to know more about parameters.

You must use this middleware with oauth2 middleware, client must have scope cloud_controller_service_permissions.read

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/cf_checkpermission"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: cf_checkpermission.CfCheckPermissionConfig{
                        Cors: &cf_checkpermission.CfCheckPermissionOptions{
                                Enabled: true,
                                ApiEndpoint: "https://api.my.cloudfoundry",
                                InstanceGUID: "service-instance-guid",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(cors.NewCors()))
// create your server

Use in config file

middleware_params:
  cf_checkpermission:
    enabled: true
    api_endpoint: https://api.my.cloudfoundry
    instance_guid: service-instance-guid
    only_manager: false

Circuit breaker

Hystrix-style circuit breaker

See godoc for CircuitBreakerOption to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/cbreaker"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: cbreaker.CircuitBreakerConfig{
                        CircuitBreaker: &cbreaker.CircuitBreakerOptions{
                                Enabled: true,
                                Expression: "NetworkErrorRatio() < 0.5",
                                FallbackUrl: "http://my.fallback.com",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(cbreaker.NewCircuitBreaker()))
// create your server

Use in config file

middleware_params:
  circuit_breaker:
    enabled: true
    expression: NetworkErrorRatio() < 0.5
    fallback_url: http://my.fallback.com

Credits

• https://github.com/vulcand/oxy

Conn limit

Limit number of simultaneous connection

See godoc for ConnLimitOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/connlimit"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: connlimit.ConnLimitConfig{
                        ConnLimit: &connlimit.ConnLimitOptions{
                                Enabled: true,
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(connlimit.NewConnLimit()))
// create your server

Use in config file

middleware_params:
  conn_limit:
    enabled: true

Credits

• https://github.com/vulcand/oxy

Cors

Add cors headers to response

See godoc for CorsOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/cors"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: cors.CorsConfig{
                        Cors: &cors.CorsOptions{
                                Enabled: true,
                                AllowedOrigins: []string{"http://localhost"},
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(cors.NewCors()))
// create your server

Use in config file

middleware_params:
  cors:
    enabled: true
    max_age: 12
    allowed_origins:
    - http://localhost

Credits

• https://github.com/rs/cors

Infopage

Add an endpoint on upstream to see information like headers set by gobis and user informations set by middlewares (Useful for frontend)

See godoc for CorsOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/infopage"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: infopage.InfoPageConfig{
                        Cors: &infopage.InfoPageOptions{
                                Enabled: true,
                                Path: "/user_info",
                                ShowAuthorizationHeader: true,
                                AuthorizationKeyName: "token",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(infopage.NewInfoPage()))
// create your server

Use in config file

middleware_params:
  info_page:
    enabled: true
    path: /user_info
    show_authorization_header: true
    authorization_key_name: token

Example of json when going to the endpoint /user_info when using infopage with oauth2 middleware:

{
	"forward": "true",
	"token": "bearer atokencontent",
	"username": "ausername",
	"groups": ["group1", "group2"]
}

Jwt

Verify a JWT token with its secret/pubkey and can give scopes as groups through context groups to use it in others middlewares

See godoc for JwtOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/jwt"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: jwt.JwtConfig{
                        Ldap: &jwt.JwtOptions{
                                Enabled: true,
                                Alg: "RS256", // this is mandatory due to security issue: https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries
                                Secret: "hmac secret or ECDSA/RSA public key", 
                                Issuer: "https://issuer.which.sign.token.com",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(jwt.NewJwt()))
// create your server

Credits

• https://github.com/auth0/go-jwt-middleware
• https://github.com/dgrijalva/jwt-go

Use in config file

middleware_params:
  jwt:
    enabled: true
    alg: RS256
    secret: hmac secret or ECDSA/RSA public key
    issuer: https://issuer.which.sign.token.com

Tips

• If key scope.* is found in the jwt token, thoses scopes will be loaded as groups and others middlewares will be able to find groups for the current user by using context groups

Ldap

Add basic authentiation based on ldap to upstream

See godoc for LdapOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/ldap"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: ldap.LdapConfig{
                        Ldap: &ldap.LdapOptions{
                                Enabled: true,
                                BindDn: "uid=readonly,dc=com",
                                BindPassword: "password",
                                Address: "ldap.example.com:636",
                                InsecureSkipVerify: true,
                                UseSsl: true,
                                SearchBaseDns: "dc=example,dc=com",
                                SearchFilter: "(objectClass=organizationalPerson)&(uid=%s)",
                                GroupSearchBaseDns: "ou=Group,dc=example,dc=com",
                                GroupSearchFilter: "(&(objectClass=posixGroup)(memberUid=%s))",
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(ldap.NewLdap()))
// create your server

Use in config file

middleware_params:
  ldap:
    enabled: true
    bind_dn: uid=readonly,dc=com
    bind_password: password
    address: ldap.example.com:636
    insecure_skip_verify: true
    use_ssl: true
    search_base_dns: dc=example,dc=com
    search_filter: (objectClass=organizationalPerson)&(uid=%s)
    group_search_base_dns: ou=Group,dc=example,dc=com
    group_search_filter: (&(objectClass=posixGroup)(memberUid=%s))

Tips

If GroupSearchBaseDns and GroupSearchFilter params are set the middleware will pass in context the list of group accessible by other middlewares by using context groups

Credits

• https://github.com/goji/httpauth
• https://github.com/go-ldap/ldap

Oauth2

Add oauth2 authentication underlying upstream

See godoc for Oauth2Options to know more about parameters.

Note: If a JWT token is provided by your oauth2 provider you should always use JWT middleware to verify it.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/oauth2"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: oauth2.Oauth2Config{
                        Ldap: &oauth2.Oauth2Options{
                                Enabled: true,
                                ClientId: "myclientid",
                                ClientSecret: "myclientsecret",
                                AuthorizationUri: "http://github.com/login/oauth/authorize",
                                AccessTokenUri: "http://github.com/login/oauth/access_token",
                                UserInfoUri: "https://api.github.com/user",
                                UseRouteTransport: true,
                                InsecureSkipVerify: false,
                                LoginPath: "/login",
                                LogoutPath: "/logout",
                                AuthKey: "my-super-strong-auth-key",
                                Scopes: []string{},
                                PassToken: false,
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(oauth2.NewOauth2()))
// create your server

Use in config file

middleware_params:
  oauth2:
    enabled: true
    client_id: myclientid
    client_secret: myclientsecret
    authorization_uri: http://github.com/login/oauth/authorize
    access_token_uri: https://github.com/login/oauth/access_token
    user_info_uri: https://api.github.com/user
    auth_key: my-super-strong-auth-key
    login_path: /login
    logout_path: /logout
    use_route_transport: true
    insecure_skip_verify: false
    pass_token: false
    scopes: []

Tips

• If user info uri is set username will retrieve from it and be passed through context username to use it in others middlewares
• Scopes will be loaded as groups and others middlewares will be able to find groups for the current user by using context groups
• Other middlewares can access to http client with oauth2 context by calling oauth2.Oauth2Client(req) where req is *http.Request variable

Credits

• https://github.com/golang/oauth2

Oauth2request

Retrieve a token with oauth2 client credentials and pass it to upstream

See godoc for Oauth2RequestOptions to know more about parameters.

THIS SHOULD BE USED CAREFULLY AS IT CAN BE A SECURITY ISSUE

Use programmatically

package main
import "github.com/orange-cloudfoundry/gobis-middlewares/oauth2request"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: oauth2request.Oauth2RequestConfig{
                        Ldap: &oauth2request.Oauth2RequestOptions{
                                Enabled: true,
                                ClientId: "myclientid",
                                ClientSecret: "myclientsecret",
                                AccessTokenUri: "http://github.com/login/oauth/access_token",
                                UseRouteTransport: true,
                                InsecureSkipVerify: false,
                                Scopes: []string{},
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(oauth2request.NewOauth2Request()))
// create your server

Use in config file

middleware_params:
  oauth2:
    enabled: true
    client_id: myclientid
    client_secret: myclientsecret
    access_token_uri: https://github.com/login/oauth/access_token
    use_route_transport: true
    insecure_skip_verify: false
    scopes: []

Credits

• https://github.com/golang/oauth2

Rate limit

Limit number of request in period of time

See godoc for RateLimitOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/ratelimit"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: ratelimit.RateLimitConfig{
                        RateLimit: &ratelimit.RateLimitOptions{
                                Enabled: true,
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(ratelimit.NewRateLimit()))
// create your server

Use in config file

middleware_params:
  rate_limit:
    enabled: true

Credits

• https://github.com/vulcand/oxy

Secure

Secure is an HTTP middleware for Go that facilitates some quick security wins.

See godoc for SecureOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/secure"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: secure.SecureConfig{
                        RateLimit: &secure.SecureOptions{
                                Enabled: true,
                                AllowedHosts: []string{"ssl.example.com"},
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(secure.NewSecure()))
// create your server

Use in config file

middleware_params:
  secure:
    enabled: true
    allowed_hosts: ["ssl.example.com"]

Credits

• https://github.com/unrolled/secure

Trace

Structured request and response logger

See godoc for TraceOptions to know more about parameters.

Use programmatically

import "github.com/orange-cloudfoundry/gobis-middlewares/trace"

configHandler := gobis.DefaultHandlerConfig{
        Routes: []gobis.ProxyRoute{
            {
                Name: "myapi",
                Path: "/app/**",
                Url: "http://www.mocky.io/v2/595625d22900008702cd71e8",
                MiddlewareParams: trace.TraceConfig{
                        Trace: &trace.TraceOptions{
                                Enabled: true,
                        },
                },
            },
        },
}
gobisHandler, err := gobis.NewDefaultHandler(configHandler, gobis.NewRouterFactory(trace.NewTrace()))
// create your server

Use in config file

middleware_params:
  trace:
    enabled: true

Credits

• https://github.com/vulcand/oxy

Documentation

Index

• func DefaultHandlers() []gobis.MiddlewareHandler

Functions

func DefaultHandlers

func DefaultHandlers() []gobis.MiddlewareHandler

DefaultHandlers Provide all middleware as a single function Order do matter ! Middleware call are made in order and middleware for security should be called first.