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query_testable.go
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query_testable.go
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// Copyright 2021 Workrise Technologies 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 gcpclient
import (
"context"
"fmt"
"sync"
crm "google.golang.org/api/cloudresourcemanager/v1"
"google.golang.org/api/compute/v1"
"google.golang.org/api/iam/v1"
"google.golang.org/api/option"
"google.golang.org/api/pubsub/v1"
"google.golang.org/api/storage/v1"
util "github.com/rigup/ephemeral-iam/internal/eiamutil"
errorsutil "github.com/rigup/ephemeral-iam/internal/errors"
)
var (
ctx = context.Background()
wg sync.WaitGroup
)
// QueryTestablePermissionsOnResource gets the testable permissions on a resource
// Modified from https://github.com/salrashid123/gcp_iam/blob/main/query/main.go#L71-L108
func QueryTestablePermissionsOnResource(resource string) ([]string, error) {
iamService, err := iam.NewService(ctx)
if err != nil {
return []string{}, errorsutil.NewSDKError("Cloud IAM", "", err)
}
permissionsService := iam.NewPermissionsService(iamService)
util.Logger.Debugf("Fetching testable permissions on %s\n", resource)
var permsToTest []string
nextPageToken := ""
for {
ps, err := permissionsService.QueryTestablePermissions(&iam.QueryTestablePermissionsRequest{
FullResourceName: resource,
PageToken: nextPageToken,
PageSize: 1000,
}).Do()
if err != nil {
return []string{}, errorsutil.New(fmt.Sprintf("Failed to get testable permissions for %s", resource), err)
}
for _, perm := range ps.Permissions {
permsToTest = append(permsToTest, perm.Name)
}
nextPageToken = ps.NextPageToken
if nextPageToken == "" {
break
}
}
return permsToTest, nil
}
// QueryComputeInstancePermissions gets the authenticated members permissions on a compute instance
// Modified from https://github.com/salrashid123/gcp_iam/blob/main/query/main.go#L351-L371
func QueryComputeInstancePermissions(
permsToTest []string,
project,
zone,
instance,
svcAcct,
reason string,
) ([]string, error) {
var computeService *compute.Service
if svcAcct != "" {
clientOptions := []option.ClientOption{
option.ImpersonateCredentials(svcAcct),
option.WithRequestReason(reason),
}
if svc, err := compute.NewService(ctx, clientOptions...); err == nil {
computeService = svc
} else {
return []string{}, errorsutil.NewSDKError("Compute", svcAcct, err)
}
} else {
if svc, err := compute.NewService(ctx); err == nil {
computeService = svc
} else {
return []string{}, errorsutil.NewSDKError("Compute", "", err)
}
}
permsToTest = remove(permsToTest, []string{
"resourcemanager.resourceTagBindings.create",
"resourcemanager.resourceTagBindings.delete",
"resourcemanager.resourceTagBindings.list",
})
resp, err := computeService.Instances.TestIamPermissions(project, zone, instance, &compute.TestPermissionsRequest{
Permissions: permsToTest,
}).Do()
if err != nil {
return []string{}, errorsutil.EiamError{
Log: util.Logger.WithError(err),
Msg: fmt.Sprintf(
"Failed to query permissions on resource projects/%s/zones/%s/instances/%s",
project,
zone,
instance,
),
Err: err,
}
}
return resp.Permissions, nil
}
// QueryProjectPermissions gets the authenticated members permissions on a project
// Modified from https://github.com/salrashid123/gcp_iam/blob/main/query/main.go#L534-L575
func QueryProjectPermissions(permsToTest []string, project, svcAcct, reason string) (perms []string, err error) {
var crmService *crm.Service
if svcAcct != "" {
clientOptions := []option.ClientOption{
option.ImpersonateCredentials(svcAcct),
option.WithRequestReason(reason),
}
if svc, err := crm.NewService(ctx, clientOptions...); err == nil {
crmService = svc
} else {
return []string{}, errorsutil.NewSDKError("Cloud Resource Manager", svcAcct, err)
}
} else {
if svc, err := crm.NewService(ctx); err == nil {
crmService = svc
} else {
return []string{}, errorsutil.NewSDKError("Cloud Resource Manager", "", err)
}
}
crmProjService := crm.NewProjectsService(crmService)
// TestIamPermissions accepts a max of 100 permissions at a time so we split them into chunks.
var chunked [][]string
numOfChunks := len(permsToTest) / 100
for i := 0; i < numOfChunks; i++ {
start := i * 100
end := start + 100
chunked = append(chunked, permsToTest[start:end])
}
rem := len(permsToTest) % 100
chunked = append(chunked, permsToTest[len(permsToTest)-rem:])
wg.Add(len(chunked))
var userPermissions []string
for _, permSet := range chunked {
go func(permissions []string, granted *[]string) {
resp, err := crmProjService.TestIamPermissions(project, &crm.TestIamPermissionsRequest{
Permissions: permissions,
}).Do()
if err != nil {
util.Logger.Errorf("Failed to query permissions on projects/%s", project)
return
}
*granted = append(*granted, resp.Permissions...)
wg.Done()
}(permSet, &userPermissions)
}
// Wait until each of the go routines have finished before returning.
wg.Wait()
return userPermissions, nil
}
// QueryPubSubPermissions gets the authenticated members permissions on a PubSub topic.
func QueryPubSubPermissions(permsToTest []string, project, topic, svcAcct, reason string) ([]string, error) {
var pubsubService *pubsub.Service
if svcAcct != "" {
clientOptions := []option.ClientOption{
option.ImpersonateCredentials(svcAcct),
option.WithRequestReason(reason),
}
if svc, err := pubsub.NewService(ctx, clientOptions...); err == nil {
pubsubService = svc
} else {
return []string{}, errorsutil.NewSDKError("PubSub", svcAcct, err)
}
} else {
if svc, err := pubsub.NewService(ctx); err == nil {
pubsubService = svc
} else {
return []string{}, errorsutil.NewSDKError("PubSub", "", err)
}
}
topicsService := pubsub.NewProjectsTopicsService(pubsubService)
resource := fmt.Sprintf("projects/%s/topics/%s", project, topic)
resp, err := topicsService.TestIamPermissions(resource, &pubsub.TestIamPermissionsRequest{
Permissions: permsToTest,
}).Do()
if err != nil {
return []string{}, errorsutil.New(fmt.Sprintf("Failed to query permissions on %s", resource), err)
}
return resp.Permissions, nil
}
// QueryServiceAccountPermissions gets the authenticated members permissions on a service account
// Modified from https://github.com/salrashid123/gcp_iam/blob/main/query/main.go#L150-L173
func QueryServiceAccountPermissions(permsToTest []string, project, email string) ([]string, error) {
iamService, err := iam.NewService(ctx)
if err != nil {
return []string{}, errorsutil.NewSDKError("Cloud IAM", "", err)
}
saIamService := iam.NewProjectsServiceAccountsService(iamService)
resource := fmt.Sprintf("projects/%s/serviceAccounts/%s", project, email)
resp, err := saIamService.TestIamPermissions(resource, &iam.TestIamPermissionsRequest{
Permissions: permsToTest,
}).Do()
if err != nil {
return []string{}, err
}
return resp.Permissions, nil
}
// QueryStorageBucketPermissions gets the authenticated members permissions on a storage bucket
// Modified from https://github.com/salrashid123/gcp_iam/blob/main/query/main.go#L313-L338
func QueryStorageBucketPermissions(permsToTest []string, bucket, svcAcct, reason string) ([]string, error) {
var storageService *storage.Service
if svcAcct != "" {
clientOptions := []option.ClientOption{
option.ImpersonateCredentials(svcAcct),
option.WithRequestReason(reason),
}
if svc, err := storage.NewService(ctx, clientOptions...); err == nil {
storageService = svc
} else {
return []string{}, errorsutil.NewSDKError("Cloud Storage", svcAcct, err)
}
} else {
if svc, err := storage.NewService(ctx); err == nil {
storageService = svc
} else {
return []string{}, errorsutil.NewSDKError("Cloud Storage", "", err)
}
}
permsToTest = remove(permsToTest, []string{
"resourcemanager.resourceTagBindings.create",
"resourcemanager.resourceTagBindings.delete",
"resourcemanager.resourceTagBindings.list",
})
resp, err := storageService.Buckets.TestIamPermissions(bucket, permsToTest).Do()
if err != nil {
return []string{}, errorsutil.New(fmt.Sprintf("Failed to query permissions on storage bucket %s", bucket), err)
}
return resp.Permissions, nil
}
func remove(perms, remove []string) []string {
rmap := make(map[string]struct{}, len(remove))
for _, perm := range remove {
rmap[perm] = struct{}{}
}
n := 0
for _, perm := range perms {
if _, found := rmap[perm]; !found {
perms[n] = perm
n++
}
}
return perms[:n]
}