420 lines
14 KiB
Go
420 lines
14 KiB
Go
package google
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import (
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"encoding/json"
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"fmt"
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"log"
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"sort"
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"github.com/hashicorp/terraform/helper/schema"
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"google.golang.org/api/cloudresourcemanager/v1"
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)
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func resourceGoogleProjectIamPolicy() *schema.Resource {
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return &schema.Resource{
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Create: resourceGoogleProjectIamPolicyCreate,
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Read: resourceGoogleProjectIamPolicyRead,
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Update: resourceGoogleProjectIamPolicyUpdate,
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Delete: resourceGoogleProjectIamPolicyDelete,
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Schema: map[string]*schema.Schema{
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"project": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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ForceNew: true,
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},
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"policy_data": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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DiffSuppressFunc: jsonPolicyDiffSuppress,
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},
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"authoritative": &schema.Schema{
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Type: schema.TypeBool,
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Optional: true,
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},
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"etag": &schema.Schema{
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Type: schema.TypeString,
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Computed: true,
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},
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"restore_policy": &schema.Schema{
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Type: schema.TypeString,
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Computed: true,
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},
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"disable_project": &schema.Schema{
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Type: schema.TypeBool,
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Optional: true,
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},
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},
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}
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}
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func resourceGoogleProjectIamPolicyCreate(d *schema.ResourceData, meta interface{}) error {
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config := meta.(*Config)
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pid := d.Get("project").(string)
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// Get the policy in the template
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p, err := getResourceIamPolicy(d)
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if err != nil {
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return fmt.Errorf("Could not get valid 'policy_data' from resource: %v", err)
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}
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// An authoritative policy is applied without regard for any existing IAM
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// policy.
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if v, ok := d.GetOk("authoritative"); ok && v.(bool) {
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log.Printf("[DEBUG] Setting authoritative IAM policy for project %q", pid)
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err := setProjectIamPolicy(p, config, pid)
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if err != nil {
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return err
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}
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} else {
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log.Printf("[DEBUG] Setting non-authoritative IAM policy for project %q", pid)
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// This is a non-authoritative policy, meaning it should be merged with
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// any existing policy
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ep, err := getProjectIamPolicy(pid, config)
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if err != nil {
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return err
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}
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// First, subtract the policy defined in the template from the
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// current policy in the project, and save the result. This will
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// allow us to restore the original policy at some point (which
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// assumes that Terraform owns any common policy that exists in
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// the template and project at create time.
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rp := subtractIamPolicy(ep, p)
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rps, err := json.Marshal(rp)
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if err != nil {
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return fmt.Errorf("Error marshaling restorable IAM policy: %v", err)
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}
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d.Set("restore_policy", string(rps))
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// Merge the policies together
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mb := mergeBindings(append(p.Bindings, rp.Bindings...))
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ep.Bindings = mb
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if err = setProjectIamPolicy(ep, config, pid); err != nil {
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return fmt.Errorf("Error applying IAM policy to project: %v", err)
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}
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}
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d.SetId(pid)
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return resourceGoogleProjectIamPolicyRead(d, meta)
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}
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func resourceGoogleProjectIamPolicyRead(d *schema.ResourceData, meta interface{}) error {
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log.Printf("[DEBUG]: Reading google_project_iam_policy")
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config := meta.(*Config)
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pid := d.Get("project").(string)
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p, err := getProjectIamPolicy(pid, config)
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if err != nil {
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return err
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}
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var bindings []*cloudresourcemanager.Binding
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if v, ok := d.GetOk("restore_policy"); ok {
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var restored cloudresourcemanager.Policy
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// if there's a restore policy, subtract it from the policy_data
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err := json.Unmarshal([]byte(v.(string)), &restored)
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if err != nil {
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return fmt.Errorf("Error unmarshaling restorable IAM policy: %v", err)
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}
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subtracted := subtractIamPolicy(p, &restored)
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bindings = subtracted.Bindings
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} else {
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bindings = p.Bindings
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}
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// we only marshal the bindings, because only the bindings get set in the config
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pBytes, err := json.Marshal(&cloudresourcemanager.Policy{Bindings: bindings})
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if err != nil {
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return fmt.Errorf("Error marshaling IAM policy: %v", err)
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}
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log.Printf("[DEBUG]: Setting etag=%s", p.Etag)
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d.Set("etag", p.Etag)
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d.Set("policy_data", string(pBytes))
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return nil
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}
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func resourceGoogleProjectIamPolicyUpdate(d *schema.ResourceData, meta interface{}) error {
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log.Printf("[DEBUG]: Updating google_project_iam_policy")
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config := meta.(*Config)
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pid := d.Get("project").(string)
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// Get the policy in the template
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p, err := getResourceIamPolicy(d)
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if err != nil {
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return fmt.Errorf("Could not get valid 'policy_data' from resource: %v", err)
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}
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pBytes, _ := json.Marshal(p)
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log.Printf("[DEBUG] Got policy from config: %s", string(pBytes))
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// An authoritative policy is applied without regard for any existing IAM
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// policy.
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if v, ok := d.GetOk("authoritative"); ok && v.(bool) {
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log.Printf("[DEBUG] Updating authoritative IAM policy for project %q", pid)
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err := setProjectIamPolicy(p, config, pid)
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if err != nil {
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return fmt.Errorf("Error setting project IAM policy: %v", err)
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}
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d.Set("restore_policy", "")
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} else {
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log.Printf("[DEBUG] Updating non-authoritative IAM policy for project %q", pid)
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// Get the previous policy from state
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pp, err := getPrevResourceIamPolicy(d)
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if err != nil {
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return fmt.Errorf("Error retrieving previous version of changed project IAM policy: %v", err)
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}
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ppBytes, _ := json.Marshal(pp)
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log.Printf("[DEBUG] Got previous version of changed project IAM policy: %s", string(ppBytes))
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// Get the existing IAM policy from the API
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ep, err := getProjectIamPolicy(pid, config)
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if err != nil {
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return fmt.Errorf("Error retrieving IAM policy from project API: %v", err)
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}
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epBytes, _ := json.Marshal(ep)
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log.Printf("[DEBUG] Got existing version of changed IAM policy from project API: %s", string(epBytes))
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// Subtract the previous and current policies from the policy retrieved from the API
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rp := subtractIamPolicy(ep, pp)
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rpBytes, _ := json.Marshal(rp)
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log.Printf("[DEBUG] After subtracting the previous policy from the existing policy, remaining policies: %s", string(rpBytes))
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rp = subtractIamPolicy(rp, p)
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rpBytes, _ = json.Marshal(rp)
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log.Printf("[DEBUG] After subtracting the remaining policies from the config policy, remaining policies: %s", string(rpBytes))
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rps, err := json.Marshal(rp)
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if err != nil {
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return fmt.Errorf("Error marhsaling restorable IAM policy: %v", err)
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}
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d.Set("restore_policy", string(rps))
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// Merge the policies together
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mb := mergeBindings(append(p.Bindings, rp.Bindings...))
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ep.Bindings = mb
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if err = setProjectIamPolicy(ep, config, pid); err != nil {
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return fmt.Errorf("Error applying IAM policy to project: %v", err)
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}
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}
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return resourceGoogleProjectIamPolicyRead(d, meta)
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}
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func resourceGoogleProjectIamPolicyDelete(d *schema.ResourceData, meta interface{}) error {
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log.Printf("[DEBUG]: Deleting google_project_iam_policy")
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config := meta.(*Config)
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pid := d.Get("project").(string)
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// Get the existing IAM policy from the API
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ep, err := getProjectIamPolicy(pid, config)
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if err != nil {
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return fmt.Errorf("Error retrieving IAM policy from project API: %v", err)
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}
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// Deleting an authoritative policy will leave the project with no policy,
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// and unaccessible by anyone without org-level privs. For this reason, the
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// "disable_project" property must be set to true, forcing the user to ack
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// this outcome
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if v, ok := d.GetOk("authoritative"); ok && v.(bool) {
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if v, ok := d.GetOk("disable_project"); !ok || !v.(bool) {
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return fmt.Errorf("You must set 'disable_project' to true before deleting an authoritative IAM policy")
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}
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ep.Bindings = make([]*cloudresourcemanager.Binding, 0)
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} else {
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// A non-authoritative policy should set the policy to the value of "restore_policy" in state
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// Get the previous policy from state
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rp, err := getRestoreIamPolicy(d)
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if err != nil {
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return fmt.Errorf("Error retrieving previous version of changed project IAM policy: %v", err)
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}
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ep.Bindings = rp.Bindings
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}
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if err = setProjectIamPolicy(ep, config, pid); err != nil {
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return fmt.Errorf("Error applying IAM policy to project: %v", err)
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}
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d.SetId("")
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return nil
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}
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// Subtract all bindings in policy b from policy a, and return the result
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func subtractIamPolicy(a, b *cloudresourcemanager.Policy) *cloudresourcemanager.Policy {
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am := rolesToMembersMap(a.Bindings)
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for _, b := range b.Bindings {
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if _, ok := am[b.Role]; ok {
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for _, m := range b.Members {
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delete(am[b.Role], m)
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}
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if len(am[b.Role]) == 0 {
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delete(am, b.Role)
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}
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}
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}
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a.Bindings = rolesToMembersBinding(am)
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return a
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}
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func setProjectIamPolicy(policy *cloudresourcemanager.Policy, config *Config, pid string) error {
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// Apply the policy
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pbytes, _ := json.Marshal(policy)
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log.Printf("[DEBUG] Setting policy %#v for project: %s", string(pbytes), pid)
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_, err := config.clientResourceManager.Projects.SetIamPolicy(pid,
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&cloudresourcemanager.SetIamPolicyRequest{Policy: policy}).Do()
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if err != nil {
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return fmt.Errorf("Error applying IAM policy for project %q. Policy is %#v, error is %s", pid, policy, err)
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}
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return nil
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}
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// Get a cloudresourcemanager.Policy from a schema.ResourceData
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func getResourceIamPolicy(d *schema.ResourceData) (*cloudresourcemanager.Policy, error) {
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ps := d.Get("policy_data").(string)
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// The policy string is just a marshaled cloudresourcemanager.Policy.
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policy := &cloudresourcemanager.Policy{}
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if err := json.Unmarshal([]byte(ps), policy); err != nil {
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return nil, fmt.Errorf("Could not unmarshal %s:\n: %v", ps, err)
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}
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return policy, nil
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}
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// Get the previous cloudresourcemanager.Policy from a schema.ResourceData if the
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// resource has changed
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func getPrevResourceIamPolicy(d *schema.ResourceData) (*cloudresourcemanager.Policy, error) {
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var policy *cloudresourcemanager.Policy = &cloudresourcemanager.Policy{}
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if d.HasChange("policy_data") {
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v, _ := d.GetChange("policy_data")
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if err := json.Unmarshal([]byte(v.(string)), policy); err != nil {
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return nil, fmt.Errorf("Could not unmarshal previous policy %s:\n: %v", v, err)
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}
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}
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return policy, nil
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}
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// Get the restore_policy that can be used to restore a project's IAM policy to its
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// state before it was adopted into Terraform
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func getRestoreIamPolicy(d *schema.ResourceData) (*cloudresourcemanager.Policy, error) {
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if v, ok := d.GetOk("restore_policy"); ok {
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policy := &cloudresourcemanager.Policy{}
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if err := json.Unmarshal([]byte(v.(string)), policy); err != nil {
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return nil, fmt.Errorf("Could not unmarshal previous policy %s:\n: %v", v, err)
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}
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return policy, nil
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}
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return nil, fmt.Errorf("Resource does not have a 'restore_policy' attribute defined.")
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}
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// Retrieve the existing IAM Policy for a Project
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func getProjectIamPolicy(project string, config *Config) (*cloudresourcemanager.Policy, error) {
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p, err := config.clientResourceManager.Projects.GetIamPolicy(project,
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&cloudresourcemanager.GetIamPolicyRequest{}).Do()
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if err != nil {
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return nil, fmt.Errorf("Error retrieving IAM policy for project %q: %s", project, err)
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}
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return p, nil
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}
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// Convert a map of roles->members to a list of Binding
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func rolesToMembersBinding(m map[string]map[string]bool) []*cloudresourcemanager.Binding {
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bindings := make([]*cloudresourcemanager.Binding, 0)
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for role, members := range m {
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b := cloudresourcemanager.Binding{
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Role: role,
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Members: make([]string, 0),
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}
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for m, _ := range members {
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b.Members = append(b.Members, m)
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}
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bindings = append(bindings, &b)
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}
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return bindings
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}
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// Map a role to a map of members, allowing easy merging of multiple bindings.
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func rolesToMembersMap(bindings []*cloudresourcemanager.Binding) map[string]map[string]bool {
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bm := make(map[string]map[string]bool)
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// Get each binding
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for _, b := range bindings {
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// Initialize members map
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if _, ok := bm[b.Role]; !ok {
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bm[b.Role] = make(map[string]bool)
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}
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// Get each member (user/principal) for the binding
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for _, m := range b.Members {
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// Add the member
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bm[b.Role][m] = true
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}
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}
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return bm
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}
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// Merge multiple Bindings such that Bindings with the same Role result in
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// a single Binding with combined Members
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func mergeBindings(bindings []*cloudresourcemanager.Binding) []*cloudresourcemanager.Binding {
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bm := rolesToMembersMap(bindings)
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rb := make([]*cloudresourcemanager.Binding, 0)
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for role, members := range bm {
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var b cloudresourcemanager.Binding
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b.Role = role
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b.Members = make([]string, 0)
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for m, _ := range members {
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b.Members = append(b.Members, m)
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}
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rb = append(rb, &b)
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}
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return rb
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}
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func jsonPolicyDiffSuppress(k, old, new string, d *schema.ResourceData) bool {
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var oldPolicy, newPolicy cloudresourcemanager.Policy
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if err := json.Unmarshal([]byte(old), &oldPolicy); err != nil {
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log.Printf("[ERROR] Could not unmarshal old policy %s: %v", old, err)
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return false
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}
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if err := json.Unmarshal([]byte(new), &newPolicy); err != nil {
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log.Printf("[ERROR] Could not unmarshal new policy %s: %v", new, err)
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return false
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}
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oldPolicy.Bindings = mergeBindings(oldPolicy.Bindings)
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newPolicy.Bindings = mergeBindings(newPolicy.Bindings)
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if newPolicy.Etag != oldPolicy.Etag {
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return false
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}
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if newPolicy.Version != oldPolicy.Version {
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return false
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}
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if len(newPolicy.Bindings) != len(oldPolicy.Bindings) {
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return false
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}
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sort.Sort(sortableBindings(newPolicy.Bindings))
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sort.Sort(sortableBindings(oldPolicy.Bindings))
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for pos, newBinding := range newPolicy.Bindings {
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oldBinding := oldPolicy.Bindings[pos]
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if oldBinding.Role != newBinding.Role {
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return false
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}
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if len(oldBinding.Members) != len(newBinding.Members) {
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return false
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}
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sort.Strings(oldBinding.Members)
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sort.Strings(newBinding.Members)
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for i, newMember := range newBinding.Members {
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oldMember := oldBinding.Members[i]
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if newMember != oldMember {
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return false
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}
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}
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}
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return true
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}
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type sortableBindings []*cloudresourcemanager.Binding
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func (b sortableBindings) Len() int {
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return len(b)
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}
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func (b sortableBindings) Swap(i, j int) {
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b[i], b[j] = b[j], b[i]
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}
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func (b sortableBindings) Less(i, j int) bool {
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return b[i].Role < b[j].Role
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}
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