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85 lines
3.1 KiB
85 lines
3.1 KiB
# OPA Quickstart Guide [](https://slack.minio.io)
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OPA is a lightweight general-purpose policy engine that can be co-located with Minio server, in this document we talk about how to use OPA HTTP API to authorize Minio STS credentials.
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## Get started
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### 1. Prerequisites
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- Docker 18.03 or above, refer here for [installation](https://docs.docker.com/install/).
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- Docker compose 1.20 or above, refere here for [installation](https://docs.docker.com/compose/install/#prerequisites).
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### 2. Start OPA
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First, create a `docker-compose.yml` file that runs OPA and the demo web server.
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```
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cat >docker-compose.yml <<EOF
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version: '2'
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services:
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opa:
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image: openpolicyagent/opa:0.9.1
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ports:
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- 8181:8181
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command:
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- "run"
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- "--server"
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- "--log-level=debug"
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api_server:
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image: openpolicyagent/demo-restful-api:0.2
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ports:
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- 5000:5000
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environment:
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- OPA_ADDR=http://opa:8181
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- POLICY_PATH=/v1/data/httpapi/authz
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EOF
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```
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Then run `docker-compose` to pull and run the containers.
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```
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docker-compose -f docker-compose.yml up
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```
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### 3. Create new OPA Policy
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In another terminal, create a policy that allows users to upload objects
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```
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cat > putobject.rego <<EOF
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package httpapi.authz
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import input as http_api
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allow {
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input.action = "s3:PutObject"
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input.owner = false
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}
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EOF
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```
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Then load the policy via OPA's REST API.
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```
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curl -X PUT --data-binary @putobject.rego \
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localhost:8181/v1/policies/putobject
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```
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### 4. Setup Minio with OPA
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Minio server expects environment variable for OPA http API url as `MINIO_IAM_OPA_URL`, this environment variable takes a single entry.
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```
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export MINIO_IAM_OPA_URL=http://localhost:8181/v1/data/httpapi/authz
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minio server /mnt/data
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```
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### 5. Test with Minio STS API
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Assuming that Minio server is configured to support STS API by following the doc [Minio STS Quickstart Guide](https://docs.minio.io/docs/minio-sts-quickstart-guide), execute the following command to temporary credentials from Minio server.
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```
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go run client-grants.go -cid PoEgXP6uVO45IsENRngDXj5Au5Ya -csec eKsw6z8CtOJVBtrOWvhRWL4TUCga
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##### Credentials
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{
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"accessKey": "IRBLVDGN5QGMDCMO1X8V",
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"secretKey": "KzS3UZKE7xqNdtRbKyfcWgxBS6P1G4kwZn4DXKuY",
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"expiration": "2018-08-21T15:49:38-07:00",
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"sessionToken": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJhY2Nlc3NLZXkiOiJJUkJMVkRHTjVRR01EQ01PMVg4ViIsImF1ZCI6IlBvRWdYUDZ1Vk80NUlzRU5SbmdEWGo1QXU1WWEiLCJhenAiOiJQb0VnWFA2dVZPNDVJc0VOUm5nRFhqNUF1NVlhIiwiZXhwIjoxNTM0ODkxNzc4LCJpYXQiOjE1MzQ4ODgxNzgsImlzcyI6Imh0dHBzOi8vbG9jYWxob3N0Ojk0NDMvb2F1dGgyL3Rva2VuIiwianRpIjoiMTg0NDMyOWMtZDY1YS00OGEzLTgyMjgtOWRmNzNmZTgzZDU2In0.4rKsZ8VkZnIS_ALzfTJ9UbEKPFlQVvIyuHw6AWTJcDFDVgQA2ooQHmH9wUDnhXBi1M7o8yWJ47DXP-TLPhwCgQ"
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}
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```
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These credentials can now be used to perform Minio API operations, these credentials automatically expire in 1hr. To understand more about credential expiry duration and client grants STS API read further [here](https://github.com/minio/minio/blob/master/docs/sts/client-grants.md).
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## Explore Further
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- [Minio STS Quickstart Guide](https://docs.minio.io/docs/minio-sts-quickstart-guide)
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- [The Minio documentation website](https://docs.minio.io)
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