Ladon is the serpent dragon protecting your resources.
Ladon is a library written in Go for access control policies, similar to Role Based Access Control or Access Control Lists. In contrast to ACL and RBAC you get fine-grained access control with the ability to answer questions in complex environments such as multi-tenant or distributed applications and large organizations. Ladon is inspired by AWS IAM Policies.
Ladon ships with storage adapters for SQL (officially supported: MySQL, PostgreSQL) and in-memory.
ORY builds solutions for better internet security and accessibility. We have a couple more projects you might enjoy:
- Hydra, a security-first open source OAuth2 and OpenID Connect server for new and existing infrastructures that uses Ladon for access control.
- ORY Editor, an extensible, modern WYSI editor for the web written in React.
- Fosite, an extensible security first OAuth 2.0 and OpenID Connect SDK for Go.
- Dockertest: Write better integration tests with dockertest!
Table of Contents
Ladon utilizes ory-am/dockertest for tests. Please refer to ory-am/dockertest for more information of how to setup testing environment.
go get github.com/ory/ladon
We recommend to use Glide for dependency management. Ladon uses semantic
versioning and versions beginning with zero (0.1.2) might introduce backwards compatibility
breaks with each minor version.
Ladon is an access control library that answers the question:
Who is able to do what on something given some context
- Who: An arbitrary unique subject name, for example "ken" or "printer-service.mydomain.com".
- Able: The effect which can be either "allow" or "deny".
- What: An arbitrary action name, for example "delete", "create" or "scoped:action:something".
- Something: An arbitrary unique resource name, for example "something", "resources.articles.1234" or some uniform resource name like "urn:isbn:3827370191".
- Context: The current context containing information about the environment such as the IP Address, request date, the resource owner name, the department ken is working in or any other information you want to pass along. (optional)
To decide what the answer is, Ladon uses policy documents which can be represented as JSON
{
"description": "One policy to rule them all.",
"subjects": ["users:<[peter|ken]>", "users:maria", "groups:admins"],
"actions" : ["delete", "<[create|update]>"],
"effect": "allow",
"resources": [
"resources:articles:<.*>",
"resources:printer"
],
"conditions": {
"remoteIP": {
"type": "CIDRCondition",
"options": {
"cidr": "192.168.0.1/16"
}
}
}
}and can answer access requests that look like:
{
"subject": "users:peter",
"action" : "delete",
"resource": "resource:articles:ladon-introduction",
"context": {
"remoteIP": "192.168.0.5"
}
}However, Ladon does not come with a HTTP or server implementation. It does not restrict JSON either. We believe that it is your job to decide if you want to use Protobuf, RESTful, HTTP, AMPQ, or some other protocol. It's up to you to write server!
The following example should give you an idea what a RESTful flow could look like. Initially we create a policy by POSTing it to an artificial HTTP endpoint:
> curl \
-X POST \
-H "Content-Type: application/json" \
-d@- \
"https://my-ladon-implementation.localhost/policies" <<EOF
{
"description": "One policy to rule them all.",
"subjects": ["users:<[peter|ken]>", "users:maria", "groups:admins"],
"actions" : ["delete", "<[create|update]>"],
"effect": "allow",
"resources": [
"resources:articles:<.*>",
"resources:printer"
],
"conditions": {
"remoteIP": {
"type": "CIDRCondition",
"options": {
"cidr": "192.168.0.1/16"
}
}
}
}
EOF
Then we test if "peter" (ip: "192.168.0.5") is allowed to "delete" the "ladon-introduction" article:
> curl \
-X POST \
-H "Content-Type: application/json" \
-d@- \
"https://my-ladon-implementation.localhost/warden" <<EOF
{
"subject": "users:peter",
"action" : "delete",
"resource": "resource:articles:ladon-introduction",
"context": {
"remoteIP": "192.168.0.5"
}
}
EOF
{
"allowed": true
}
We already discussed two essential parts of Ladon: policies and access control requests. Let's take a closer look at those two.
Policies are the basis for access control decisions. Think of them as a set of rules. In this library, policies
are abstracted as the ladon.Policy interface, and Ladon comes with a standard implementation of this interface
which is ladon.DefaultPolicy. Creating such a policy could look like:
import "github.com/ory/ladon"
var pol = &ladon.DefaultPolicy{
// A required unique identifier. Used primarily for database retrieval.
ID: "68819e5a-738b-41ec-b03c-b58a1b19d043",
// A optional human readable description.
Description: "something humanly readable",
// A subject can be an user or a service. It is the "who" in "who is allowed to do what on something".
// As you can see here, you can use regular expressions inside < >.
Subjects: []string{"max", "peter", "<zac|ken>"},
// Which resources this policy affects.
// Again, you can put regular expressions in inside < >.
Resources: []string{"myrn:some.domain.com:resource:123", "myrn:some.domain.com:resource:345", "myrn:something:foo:<.+>"},
// Which actions this policy affects. Supports RegExp
// Again, you can put regular expressions in inside < >.
Actions: []string{"<create|delete>", "get"},
// Should access be allowed or denied?
// Note: If multiple policies match an access request, ladon.DenyAccess will always override ladon.AllowAccess
// and thus deny access.
Effect: ladon.AllowAccess,
// Under which conditions this policy is "active".
Conditions: ladon.Conditions{
// In this example, the policy is only "active" when the requested subject is the owner of the resource as well.
"resourceOwner": &ladon.EqualsSubjectCondition{},
// Additionally, the policy will only match if the requests remote ip address matches address range 127.0.0.1/32
"remoteIPAddress": &ladon.CIDRCondition{
CIDR: "127.0.0.1/32",
},
},
}Conditions are functions returning true or false given a context. Because conditions implement logic, they must
be programmed. Adding conditions to a policy consist of two parts, a key name and an implementation of ladon.Condition:
// StringEqualCondition is an exemplary condition.
type StringEqualCondition struct {
Equals string `json:"equals"`
}
// Fulfills returns true if the given value is a string and is the
// same as in StringEqualCondition.Equals
func (c *StringEqualCondition) Fulfills(value interface{}, _ *ladon.Request) bool {
s, ok := value.(string)
return ok && s == c.Equals
}
// GetName returns the condition's name.
func (c *StringEqualCondition) GetName() string {
return "StringEqualCondition"
}
var pol = &ladon.DefaultPolicy{
// ...
Conditions: ladon.Conditions{
"some-arbitrary-key": &StringEqualCondition{
Equals: "the-value-should-be-this"
}
},
}The default implementation of Policy supports JSON un-/marshalling. In JSON, this policy would look like:
{
"conditions": {
"some-arbitrary-key": {
"type": "StringEqualCondition",
"options": {
"equals": "the-value-should-be-this"
}
}
}
}As you can see, type is the value that StringEqualCondition.GetName() is returning and options is used to
set the value of StringEqualCondition.Equals.
This condition is fulfilled by (we will cover the warden in the next section)
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"some-arbitrary-key": "the-value-should-be-this",
},
}but not by
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"some-arbitrary-key": "some other value",
},
}and neither by:
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"same value but other key": "the-value-should-be-this",
},
}Ladon ships with a couple of default conditions:
The CIDR condition matches CIDR IP Ranges. Using this condition would look like this in JSON:
{
"conditions": {
"remoteIP": {
"type": "CIDRCondition",
"options": {
"cidr": "192.168.0.1/16"
}
}
}
}and in Go:
var pol = &ladon.DefaultPolicy{
Conditions: ladon.Conditions{
"remoteIPAddress": &ladon.CIDRCondition{
CIDR: "192.168.0.1/16",
},
},
}In this case, we expect that the context of an access request contains a field "remoteIpAddress" matching
the CIDR "192.168.0.1/16", for example "192.168.0.5".
Checks if the value passed in the access request's context is identical with the string that was given initially
var pol = &ladon.DefaultPolicy{
Conditions: ladon.Conditions{
"some-arbitrary-key": &ladon.StringEqualCondition{
Equals: "the-value-should-be-this"
}
},
}and would match in the following case:
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"some-arbitrary-key": "the-value-should-be-this",
},
}Checks if the access request's subject is identical with the string that was given initially
var pol = &ladon.DefaultPolicy{
Conditions: ladon.Conditions{
"some-arbitrary-key": &ladon.EqualsSubjectCondition{}
},
}and would match
var err = warden.IsAllowed(&ladon.Request{
// ...
Subject: "peter",
Context: &ladon.Context{
"some-arbitrary-key": "peter",
},
}but not:
var err = warden.IsAllowed(&ladon.Request{
// ...
Subject: "peter",
Context: &ladon.Context{
"some-arbitrary-key": "max",
},
}Checks if the value passed in the access request's context contains two-element arrays and that both elements in each pair are equal.
var pol = &ladon.DefaultPolicy{
Conditions: ladon.Conditions{
"some-arbitrary-key": &ladon.StringPairsEqualCondition{}
},
}and would match
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"some-arbitrary-key": [
["some-arbitrary-pair-value", "some-arbitrary-pair-value"],
["some-other-arbitrary-pair-value", "some-other-arbitrary-pair-value"],
]
},
}but not:
var err = warden.IsAllowed(&ladon.Request{
// ...
Context: &ladon.Context{
"some-arbitrary-key": [
["some-arbitrary-pair-value", "some-other-arbitrary-pair-value"],
]
},
}You can add custom conditions by appending it to ladon.ConditionFactories:
import "github.com/ory/ladon"
func main() {
// ...
ladon.ConditionFactories[new(CustomCondition).GetName()] = func() Condition {
return new(CustomCondition)
}
// ...
}Obviously, creating such a policy is not enough. You want to persist it too. Ladon ships an interface ladon.Manager for
this purpose with default implementations for In-Memory and SQL (PostgreSQL, MySQL). There are also adapters available
written by the community for Redis and RethinkDB
Let's take a look how to instantiate those:
In-Memory (officially supported)
import (
"github.com/ory/ladon"
manager "github.com/ory/ladon/manager/memory"
)
func main() {
warden := &ladon.Ladon{
Manager: manager.NewMemoryManager(),
}
err := warden.Manager.Create(pol)
// ...
}SQL (officially supported)
import "github.com/ory/ladon"
import manager "github.com/ory/ladon/manager/sql"
import "database/sql"
import _ "github.com/go-sql-driver/mysql"
func main() {
db, err = sql.Open("mysql", "user:pass@tcp(127.0.0.1:3306)"")
// Or, if using postgres:
// import _ "github.com/lib/pq"
//
// db, err = sql.Open("postgres", "postgres://foo:bar@localhost/ladon")
if err != nil {
log.Fatalf("Could not connect to database: %s", err)
}
warden := ladon.Ladon{
Manager: manager.NewSQLManager(db, nil),
}
// ...
}Now that we have defined our policies, we can use the warden to check if a request is valid.
ladon.Ladon, which is the default implementation for the ladon.Warden interface defines ladon.Ladon.IsAllowed() which
will return nil if the access request can be granted and an error otherwise.
import "github.com/ory/ladon"
func main() {
// ...
if err := warden.IsAllowed(&ladon.Request{
Subject: "peter",
Action: "delete",
Resource: "myrn:some.domain.com:resource:123",
Context: ladon.Context{
"ip": "127.0.0.1",
},
}); err != nil {
log.Fatal("Access denied")
}
// ...
}Ladon's limitations are listed here.
Matching regular expressions has a complexity of O(n) and databases such as MySQL or Postgres can not
leverage indexes when parsing regular expressions. Thus, there is considerable overhead when using regular
expressions.
We have implemented various strategies for reducing policy matching time:
- An LRU cache is used for caching frequently compiled regular expressions. This reduces cpu complexity significantly for memory manager implementations.
- The SQL schema is 3NF normalized.
- Policies, subjects and actions are stored uniquely, reducing the total number of rows.
- Only one query per look up is executed.
- If no regular expression is used, a simple equal match is done in SQL back-ends.
You will get the best performance with the in-memory manager. The SQL adapters perform about 1000:1 compared to the in-memory solution. Please note that these tests where in laboratory environments with Docker, without an SSD, and single-threaded. You might get better results on your system. We are thinking about introducing It would be possible a simple cache strategy such as LRU with a maximum age to further reduce runtime complexity.
We are also considering to offer different matching strategies (e.g. wildcard match) in the future, which will perform better with SQL databases. If you have ideas or suggestions, leave us an issue.
Check out ladon_test.go which includes a couple of policies and tests cases. You can run the code with go test -run=TestLadon -v .
- All checks are case sensitive because subject values could be case sensitive IDs.
- If
ladon.Ladonis not able to match a policy with the request, it will default to denying the request and return an error.
Ladon does not use reflection for matching conditions to their appropriate structs due to security considerations.
Create mocks
mockgen -package ladon_test -destination manager_mock_test.go github.com/ory/ladon Manager