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Copy pathopa.go
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136 lines (116 loc) · 2.96 KB
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/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package iampolicy
import (
"bytes"
"encoding/json"
"io"
"net/http"
"os"
xnet "github.com/minio/minio/pkg/net"
)
// OpaArgs opa general purpose policy engine configuration.
type OpaArgs struct {
URL *xnet.URL `json:"url"`
AuthToken string `json:"authToken"`
Transport http.RoundTripper `json:"-"`
CloseRespFn func(r io.ReadCloser) `json:"-"`
}
// Validate - validate opa configuration params.
func (a *OpaArgs) Validate() error {
return nil
}
// UnmarshalJSON - decodes JSON data.
func (a *OpaArgs) UnmarshalJSON(data []byte) error {
// subtype to avoid recursive call to UnmarshalJSON()
type subOpaArgs OpaArgs
var so subOpaArgs
if opaURL, ok := os.LookupEnv("MINIO_IAM_OPA_URL"); ok {
u, err := xnet.ParseURL(opaURL)
if err != nil {
return err
}
so.URL = u
so.AuthToken = os.Getenv("MINIO_IAM_OPA_AUTHTOKEN")
} else {
if err := json.Unmarshal(data, &so); err != nil {
return err
}
}
oa := OpaArgs(so)
if oa.URL == nil || oa.URL.String() == "" {
*a = oa
return nil
}
if err := oa.Validate(); err != nil {
return err
}
*a = oa
return nil
}
// Opa - implements opa policy agent calls.
type Opa struct {
args OpaArgs
client *http.Client
}
// NewOpa - initializes opa policy engine connector.
func NewOpa(args OpaArgs) *Opa {
// No opa args.
if args.URL == nil && args.AuthToken == "" {
return nil
}
return &Opa{
args: args,
client: &http.Client{Transport: args.Transport},
}
}
// IsAllowed - checks given policy args is allowed to continue the REST API.
func (o *Opa) IsAllowed(args Args) bool {
if o == nil {
return false
}
// OPA input
body := make(map[string]interface{})
body["input"] = args
inputBytes, err := json.Marshal(body)
if err != nil {
return false
}
req, err := http.NewRequest("POST", o.args.URL.String(), bytes.NewReader(inputBytes))
if err != nil {
return false
}
req.Header.Set("Content-Type", "application/json")
if o.args.AuthToken != "" {
req.Header.Set("Authorization", o.args.AuthToken)
}
resp, err := o.client.Do(req)
if err != nil {
return false
}
defer o.args.CloseRespFn(resp.Body)
// Handle OPA response
type opaResponse struct {
Result struct {
Allow bool `json:"allow"`
} `json:"result"`
}
var result opaResponse
if err = json.NewDecoder(resp.Body).Decode(&result); err != nil {
return false
}
return result.Result.Allow
}