Repokid
Repokid uses Access Advisor provided by Aardvark to remove permissions granting access to unused services from the inline policies of IAM roles in an AWS account.
Getting Started
Install
mkvirtualenv repokid
git clone [email protected]:Netflix/repokid.git
cd repokid
pip install -e .
repokid config config.json
DynamoDB
You will need a DynamoDB table called repokid_roles
(specify account and endpoint in dynamo_db
in config file).
The table should have the following properties:
RoleId
(string) as a primary partition key, no primary sort key- A global secondary index named
Account
with a primary partition key ofAccount
andRoleId
andAccount
as projected attributes - A global secondary index named
RoleName
with a primary partition key ofRoleName
andRoleId
andRoleName
as projected attributes
For development, you can run dynamo locally.
To run locally:
java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb -inMemory -port 8010
If you run the development version the table and index will be created for you automatically.
IAM Permissions:
Repokid needs an IAM Role in each account that will be queried. Additionally, Repokid needs to be launched with a role or user which can sts:AssumeRole
into the different account roles.
RepokidInstanceProfile:
- Only create one.
- Needs the ability to call
sts:AssumeRole
into all of the RepokidRoles. - DynamoDB permissions for the
repokid_roles
table and all indexes (specified inassume_role
subsection ofdynamo_db
in config) and the ability to rundynamodb:ListTables
RepokidRole:
- Must exist in every account to be managed by repokid.
- Must have a trust policy allowing
RepokidInstanceProfile
. - Name must be specified in
connection_iam
in config file. - Has these permissions:
{
"Version": "2012-10-17",
"Statement": [
{
"Action": [
"iam:DeleteInstanceProfile",
"iam:DeleteRole",
"iam:DeleteRolePolicy",
"iam:GetAccountAuthorizationDetails",
"iam:GetInstanceProfile",
"iam:GetRole",
"iam:GetRolePolicy",
"iam:ListInstanceProfiles",
"iam:ListInstanceProfilesForRole",
"iam:ListRolePolicies",
"iam:PutRolePolicy",
"iam:UpdateRoleDescription"
],
"Effect": "Allow",
"Resource": "*"
}
]
}
So if you are monitoring n
accounts, you will always need n+1
roles. (n
RepokidRoles and 1
RepokidInstanceProfile).
Editing config.json
Running repokid config config.json
creates a file that you will need to edit. Find and update these fields:
dynamodb
: If using dynamo locally, set the endpoint tohttp://localhost:8010
. If using AWS hosted dynamo, set theregion
,assume_role
, andaccount_number
.aardvark_api_location
: The location to your Aardvark REST API. Something likehttps://aardvark.yourcompany.net/api/1/advisors
connection_iam
: Setassume_role
toRepokidRole
, or whatever you have called it.
Optional Config
Repokid uses filters to decide which roles are candidates to be repoed. Filters may be configured to suit your environment as described below.
Blocklist Filter
Roles may be excluded by adding them to the Blocklist filter. One common reason to exclude a role is if the corresponding workload performs occasional actions that may not have been observed but are known to be required. There are two ways to exclude a role:
- Exclude role name for all accounts: add it to a list in the config
filter_config.BlocklistFilter.all
- Exclude role name for specific account: add it to a list in the config
filter_config.BlocklistFilter.<ACCOUNT_NUMBER>
Blocklists can also be maintained in an S3 blocklist file. They should be in the following form:
{
"arns": ["arn1", "arn2"],
"names": {"role_name_1": ["all", "account_number_1"], "role_name_2": ["account_number_2", "account_number_3"]}
}
Exclusive Filter
If you prefer to repo only certain roles you can use the Exclusive Filter. Maybe you want to consider only roles used in production or by certain teams.
To select roles for repo-ing you may list their names in the configuration files. Shell style glob patterns are also supported.
Role selection can be specified per individual account or globally.
To activate this filter put "repokid.filters.exclusive:ExclusiveFilter"
in the section active_filters
of the config file.
To configure it you can start with the autogenerated config file, which has an example config in the "filter_config"
section:
"ExclusiveFilter": {
"all": [
"<GLOB_PATTERN>"
],
"<ACCOUNT_NUMBER>": [
"<GLOB_PATTERN>"
]
}
Age Filter
By default the age filter excludes roles that are younger than 90 days. To change this edit the config setting:
filter_config.AgeFilter.minimum_age
.
Active Filters
New filters can be created to support internal logic. At Netflix we have several that are specific to our
use cases. To make them active make sure they are in the Python path and add them in the config to the list in
the section active_filters
.
How to Use
Once Repokid is configured, use it as follows:
Standard flow
- Update role cache:
repokid update_role_cache <ACCOUNT_NUMBER>
- Display role cache:
repokid display_role_cache <ACCOUNT_NUMBER>
- Display information about a specific role:
repokid display_role <ACCOUNT_NUMBER> <ROLE_NAME>
- Repo a specific role:
repokid repo_role <ACCOUNT_NUMBER> <ROLE_NAME>
- Repo all roles in an account:
repokid repo_all_roles <ACCOUNT_NUMBER> -c
Scheduling
Rather than running a repo right now you can schedule one (schedule_repo
command). The duration between scheduling and eligibility is configurable, but by default roles can be repoed 7 days after scheduling. You can then run a command repo_scheduled_roles
to only repo roles which have already been scheduled.
Targeting a specific permission
Say that you find a given permission especially dangerous in your environment. Here I'll use s3:PutObjectACL
as an example. You can use Repokid to find all roles that have this permission (even those hidden in a wildcard), and then remove just that single permission.
Find & Remove:
- Ensure the role cache is updated before beginning.
- Find roles with a given permission:
repokid find_roles_with_permissions <permission>... [--output=ROLE_FILE]
- Remove permission from roles:
repokid remove_permissions_from_roles --role-file=ROLE_FILE <permission>... [-c]
Example:
$ repokid find_roles_with_permissions "s3:putobjectacl" "sts:assumerole" --output=myroles.json
...
$ repokid remove_permissions_from_roles --role-file=myroles.json "s3:putobjectacl" "sts:assumerole" -c
Rolling back
Repokid stores a copy of each version of inline policies it knows about. These are added when
a different version of a policy is found during update_role_cache
and any time a repo action
occurs. To restore a previous version run:
See all versions of roles: repokid rollback_role <ACCOUNT_NUMBER> <ROLE_NAME>
Restore a specific version: repokid rollback_role <ACCOUNT_NUMBER> <ROLE_NAME> --selection=<NUMBER> -c
Stats
Repokid keeps counts of the total permissions for each role. Stats are added any time an update_role_cache
or
repo_role
action occur. To output all stats to a CSV file run: repokid repo_stats <OUTPUT_FILENAME>
. An optional account number can be specified to output stats for a specific account only.
Dispatcher
Repokid Dispatcher is designed to listen for messages on a queue and perform actions. So far the actions are:
- List repoable services from a role
- Set or remove an opt-out
- List and perform rollbacks for a role
Repokid will respond on a configurable SNS topic with information about any success or failures. The Dispatcher component exists to help with operationalization of the repo lifecycle across your organization. You may choose to expose the queue directly to developers, but more likely this should be guarded because rolling back can be a destructive action if not done carefully.