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forseti.go
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forseti.go
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// Copyright 2019 Google LLC
//
// 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 apply
import (
"encoding/json"
"errors"
"fmt"
"log"
"os/exec"
"strings"
"github.com/GoogleCloudPlatform/healthcare/deploy/config"
"github.com/GoogleCloudPlatform/healthcare/deploy/config/tfconfig"
"github.com/GoogleCloudPlatform/healthcare/deploy/runner"
"github.com/GoogleCloudPlatform/healthcare/deploy/terraform"
)
// Standard (built in) roles required by the Forseti service account on projects to be monitored.
// This list includes project level roles from
// https://github.com/forseti-security/terraform-google-forseti/blob/master/modules/server/main.tf#L63
// In the future, have a deeper integration with Forseti module and reuse the role list.
var forsetiStandardRoles = [...]string{
"appengine.appViewer",
"bigquery.metadataViewer",
"browser",
"cloudasset.viewer",
"cloudsql.viewer",
"compute.networkViewer",
"iam.securityReviewer",
"servicemanagement.quotaViewer",
"serviceusage.serviceUsageConsumer",
}
// Forseti applies project configuration to a Forseti project.
func Forseti(conf *config.Config, opts *Options, terraformConfigsDir string, rn runner.Runner) error {
project := conf.Forseti.Project
if err := Default(conf, project, opts, rn); err != nil {
return err
}
workDir, err := terraform.WorkDir(terraformConfigsDir, project.ID)
if err != nil {
return err
}
// Always deploy state bucket, otherwise a forseti installation that failed half way through
// will be left in a partial state and every following attempt will install a fresh instance.
// TODO: once terraform is launched and default just let the Default take care of deploying the state bucket and remove this block.
if err := stateBucket(project, workDir, rn); err != nil {
return fmt.Errorf("failed to deploy terraform state: %v", err)
}
if err := forsetiConfig(conf, opts, workDir, rn); err != nil {
return fmt.Errorf("failed to apply forseti config: %v", err)
}
if err := GrantForsetiPermissions(project.ID, conf.AllGeneratedFields.Forseti.ServiceAccount, project.DevopsConfig.StateBucket.Name, opts, workDir, rn); err != nil {
return err
}
return nil
}
// forsetiConfig applies the forseti config, if it exists. It does not configure
// other settings such as billing account, deletion lien, etc.
func forsetiConfig(conf *config.Config, opts *Options, workDir string, rn runner.Runner) error {
if conf.Forseti == nil {
log.Println("no forseti config, nothing to do")
return nil
}
project := conf.Forseti.Project
tfConf := terraform.NewConfig()
tfConf.Modules = []*terraform.Module{{
Name: "forseti",
Source: "./external/terraform_google_forseti",
Properties: conf.Forseti.Properties,
}}
tfConf.Terraform.Backend = &terraform.Backend{
Bucket: conf.Forseti.Project.DevopsConfig.StateBucket.Name,
Prefix: "forseti",
}
workDir, err := terraform.WorkDir(workDir, "forseti")
if err != nil {
return err
}
if err := terraformApply(tfConf, workDir, &terraform.Options{ApplyFlags: opts.TerraformApplyFlags}, rn); err != nil {
return err
}
serviceAccount, err := forsetiServerServiceAccount(project.ID, rn)
if err != nil {
return fmt.Errorf("failed to set Forseti server service account: %v", err)
}
conf.AllGeneratedFields.Forseti.ServiceAccount = serviceAccount
serverBucket, err := forsetiServerBucket(project.ID, rn)
if err != nil {
return fmt.Errorf("failed to set Forseti server bucket: %v", err)
}
conf.AllGeneratedFields.Forseti.ServiceBucket = serverBucket
return nil
}
func stateBucket(project *config.Project, workDir string, rn runner.Runner) error {
if project.DevopsConfig.StateBucket == nil {
return errors.New("state_storage_bucket must not be nil")
}
tfConf := terraform.NewConfig()
if err := addResources(tfConf, project.DevopsConfig.StateBucket); err != nil {
return err
}
opts := &terraform.Options{}
if err := addImports(opts, rn, project.DevopsConfig.StateBucket); err != nil {
return err
}
workDir, err := terraform.WorkDir(workDir, "state")
if err != nil {
return err
}
return terraformApply(tfConf, workDir, opts, rn)
}
// GrantForsetiPermissions grants all necessary permissions to the given Forseti service account in the project.
func GrantForsetiPermissions(projectID, serviceAccount, stateBucket string, opts *Options, workDir string, rn runner.Runner) error {
iamMembers := new(tfconfig.ProjectIAMMembers)
if err := iamMembers.Init(projectID); err != nil {
return fmt.Errorf("failed to init IAM members resource: %v", err)
}
for _, r := range forsetiStandardRoles {
iamMembers.Members = append(iamMembers.Members,
&tfconfig.ProjectIAMMember{Role: "roles/" + r, Member: "serviceAccount:" + serviceAccount},
)
}
tfConf := terraform.NewConfig()
// TODO: Remove this check once TF is always enabled as the bucket should always be present then.
if stateBucket != "" {
tfConf.Terraform.Backend = &terraform.Backend{
Bucket: stateBucket,
Prefix: "forseti-access",
}
}
if err := addResources(tfConf, iamMembers); err != nil {
return err
}
workDir, err := terraform.WorkDir(workDir, "forseti-access")
if err != nil {
return err
}
return terraformApply(tfConf, workDir, &terraform.Options{ApplyFlags: opts.TerraformApplyFlags}, rn)
}
// forsetiServerServiceAccount gets the server instance service account of the give Forseti project.
// TODO: Use Terraform state or output.
func forsetiServerServiceAccount(projectID string, rn runner.Runner) (string, error) {
cmd := exec.Command(
"gcloud", "--project", projectID,
"iam", "service-accounts", "list", "--format", "json",
"--filter", "email:forseti-server-gcp-*",
)
out, err := rn.CmdOutput(cmd)
if err != nil {
return "", fmt.Errorf("failed to obtain Forseti server service account: %v", err)
}
type serviceAccount struct {
Email string `json:"email"`
}
var serviceAccounts []serviceAccount
if err := json.Unmarshal(out, &serviceAccounts); err != nil {
return "", fmt.Errorf("failed to unmarshal service accounts output: %v", err)
}
if len(serviceAccounts) != 1 {
return "", fmt.Errorf("unexpected number of Forseti server service accounts: got %d, want 1", len(serviceAccounts))
}
return serviceAccounts[0].Email, nil
}
// forsetiServerBucket gets the bucket holding the Forseti server instance's configuration.
// TODO: Use Terraform state or output.
func forsetiServerBucket(projectID string, rn runner.Runner) (string, error) {
cmd := exec.Command("gsutil", "ls", "-p", projectID)
out, err := rn.CmdOutput(cmd)
if err != nil {
return "", fmt.Errorf("failed to obtain Forseti server bucket: %v", err)
}
var bs []string
for _, b := range strings.Split(strings.TrimSpace(string(out)), "\n") {
if strings.HasPrefix(b, "gs://forseti-server-") {
bs = append(bs, b)
}
}
if len(bs) != 1 {
return "", fmt.Errorf("unexpected number of Forseti server buckets: got %d, want 1", len(bs))
}
return bs[0], nil
}