forked from canonical/lxd
/
server.go
540 lines (433 loc) · 11 KB
/
server.go
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package rbac
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/http/cookiejar"
"net/url"
"path"
"strconv"
"sync"
"time"
"gopkg.in/macaroon-bakery.v2/bakery"
"gopkg.in/macaroon-bakery.v2/httpbakery"
"gopkg.in/macaroon-bakery.v2/httpbakery/agent"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/logger"
)
type rbacResource struct {
Identifier string `json:"identifier"`
Name string `json:"name"`
}
type rbacResourcePost struct {
LastSyncID *string `json:"last-sync-id"`
Updates []rbacResource `json:"updates,omitempty"`
Removals []string `json:"removals,omitempty"`
}
type rbacResourcePostResponse struct {
SyncID string `json:"sync-id"`
}
type rbacStatus struct {
LastChange string `json:"last-change"`
}
// Errors
var errUnknownUser = fmt.Errorf("Unknown RBAC user")
// UserAccess struct for permission checks.
type UserAccess struct {
Admin bool
Projects map[string][]string
}
// Server represents an RBAC server.
type Server struct {
apiURL string
apiKey string
lastSyncID string
client *httpbakery.Client
lastChange string
ctx context.Context
ctxCancel context.CancelFunc
resources map[string]string // Maps name to identifier
resourcesLock sync.Mutex
permissions map[string]map[string][]string
permissionsLock *sync.Mutex
ProjectsFunc func() (map[int64]string, error)
}
// NewServer returns a new RBAC server instance.
func NewServer(apiURL string, apiKey string, agentAuthURL string, agentUsername string, agentPrivateKey string, agentPublicKey string) (*Server, error) {
r := Server{
apiURL: apiURL,
apiKey: apiKey,
lastSyncID: "",
lastChange: "",
resources: make(map[string]string),
permissions: make(map[string]map[string][]string),
permissionsLock: &sync.Mutex{},
}
// Setup context
r.ctx, r.ctxCancel = context.WithCancel(context.Background())
var keyPair bakery.KeyPair
keyPair.Private.UnmarshalText([]byte(agentPrivateKey))
keyPair.Public.UnmarshalText([]byte(agentPublicKey))
r.client = httpbakery.NewClient()
authInfo := agent.AuthInfo{
Key: &keyPair,
Agents: []agent.Agent{
{
URL: agentAuthURL,
Username: agentUsername,
},
},
}
err := agent.SetUpAuth(r.client, &authInfo)
if err != nil {
return nil, err
}
r.client.Client.Jar, err = cookiejar.New(nil)
if err != nil {
return nil, err
}
return &r, nil
}
// StartStatusCheck runs a status checking loop.
func (r *Server) StartStatusCheck() {
var status rbacStatus
// Figure out the new URL.
u, err := url.Parse(r.apiURL)
if err != nil {
logger.Errorf("Failed to parse RBAC url: %v", err)
return
}
u.Path = path.Join(u.Path, "/api/service/v1/changes")
go func() {
for {
if status.LastChange != "" {
values := url.Values{}
values.Set("last-change", status.LastChange)
u.RawQuery = values.Encode()
}
req, err := http.NewRequestWithContext(r.ctx, "GET", u.String(), nil)
if err != nil {
if err == context.Canceled {
return
}
logger.Errorf("Failed to prepare RBAC query: %v", err)
return
}
resp, err := r.client.Do(req)
if err != nil {
if err == context.Canceled {
return
}
logger.Errorf("Failed to hit new RBAC URL, falling back: %v", err)
r.oldStatusCheck()
return
}
if resp.StatusCode == 404 {
resp.Body.Close()
logger.Debugf("RBAC server doesn't support new monitoring API, falling back.")
r.oldStatusCheck()
return
}
if resp.StatusCode == 504 {
// 504 indicates the server timed out the background connection, just re-connect.
resp.Body.Close()
continue
}
if resp.StatusCode != 200 {
// For other errors we assume a server restart and give it a few seconds.
resp.Body.Close()
logger.Debugf("RBAC server disconnected, re-connecting. (code=%v)", resp.StatusCode)
time.Sleep(5 * time.Second)
continue
}
err = json.NewDecoder(resp.Body).Decode(&status)
resp.Body.Close()
if err != nil {
logger.Errorf("Failed to parse RBAC response, re-trying: %v", err)
time.Sleep(5 * time.Second)
continue
}
r.lastChange = status.LastChange
logger.Debugf("RBAC change detected, flushing cache")
r.flushCache()
}
}()
}
func (r *Server) oldStatusCheck() {
// NOTE: Can be dropped once new RBAC hits stable.
r.hasStatusChanged()
go func() {
for {
select {
case <-r.ctx.Done():
return
case <-time.After(time.Minute):
if r.hasStatusChanged() {
logger.Debugf("RBAC change detected, flushing cache")
r.flushCache()
}
}
}
}()
}
// StopStatusCheck stops the periodic status checker.
func (r *Server) StopStatusCheck() {
r.ctxCancel()
}
// SyncProjects updates the list of projects in RBAC
func (r *Server) SyncProjects() error {
if r.ProjectsFunc == nil {
return fmt.Errorf("ProjectsFunc isn't configured yet, cannot sync")
}
resources := []rbacResource{}
resourcesMap := map[string]string{}
// Get all projects
projects, err := r.ProjectsFunc()
if err != nil {
return err
}
// Convert to RBAC format
for id, name := range projects {
resources = append(resources, rbacResource{
Name: name,
Identifier: strconv.FormatInt(id, 10),
})
resourcesMap[name] = strconv.FormatInt(id, 10)
}
// Update RBAC
err = r.postResources(resources, nil, true)
if err != nil {
return err
}
// Update project map
r.resourcesLock.Lock()
r.resources = resourcesMap
r.resourcesLock.Unlock()
return nil
}
// AddProject adds a new project resource to RBAC.
func (r *Server) AddProject(id int64, name string) error {
resource := rbacResource{
Name: name,
Identifier: strconv.FormatInt(id, 10),
}
// Update RBAC
err := r.postResources([]rbacResource{resource}, nil, false)
if err != nil {
return err
}
// Update project map
r.resourcesLock.Lock()
r.resources[name] = strconv.FormatInt(id, 10)
r.resourcesLock.Unlock()
return nil
}
// DeleteProject adds a new project resource to RBAC.
func (r *Server) DeleteProject(id int64) error {
// Update RBAC
err := r.postResources(nil, []string{strconv.FormatInt(id, 10)}, false)
if err != nil {
return err
}
// Update project map
r.resourcesLock.Lock()
for k, v := range r.resources {
if v == strconv.FormatInt(id, 10) {
delete(r.resources, k)
break
}
}
r.resourcesLock.Unlock()
return nil
}
// RenameProject renames an existing project resource in RBAC.
func (r *Server) RenameProject(id int64, name string) error {
return r.AddProject(id, name)
}
// UserAccess returns a UserAccess struct for the user.
func (r *Server) UserAccess(username string) (*UserAccess, error) {
r.permissionsLock.Lock()
defer r.permissionsLock.Unlock()
// Check whether the permissions are cached.
_, cached := r.permissions[username]
if !cached {
r.syncPermissions(username)
}
// Checked if the user exists.
permissions, ok := r.permissions[username]
if !ok {
return nil, errUnknownUser
}
// Prepare the response.
access := UserAccess{
Admin: shared.StringInSlice("admin", permissions[""]),
Projects: map[string][]string{},
}
for k, v := range permissions {
// Skip the global permissions.
if k == "" {
continue
}
// Look for project name.
for projectName, resourceID := range r.resources {
if k != resourceID {
continue
}
access.Projects[projectName] = v
break
}
// Ignore unknown projects.
}
return &access, nil
}
func (r *Server) hasStatusChanged() bool {
var status rbacStatus
u, err := url.Parse(r.apiURL)
if err != nil {
return true
}
u.Path = path.Join(u.Path, "/api/service/v1/status")
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return true
}
resp, err := r.client.Do(req)
if err != nil {
return true
}
defer resp.Body.Close()
err = json.NewDecoder(resp.Body).Decode(&status)
if err != nil {
return true
}
if r.lastChange == "" {
r.lastChange = status.LastChange
return true
}
hasChanged := r.lastChange != status.LastChange
r.lastChange = status.LastChange
return hasChanged
}
func (r *Server) flushCache() {
r.permissionsLock.Lock()
defer r.permissionsLock.Unlock()
logger.Info("Flushing RBAC permissions cache")
for k, v := range r.permissions {
for k := range v {
delete(v, k)
}
delete(r.permissions, k)
}
logger.Info("Flushed RBAC permissions cache")
}
func (r *Server) syncAdmin(username string) bool {
u, err := url.Parse(r.apiURL)
if err != nil {
return false
}
values := url.Values{}
values.Set("u", username)
u.RawQuery = values.Encode()
u.Path = path.Join(u.Path, "/api/service/v1/resources/lxd/permissions-for-user")
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return false
}
resp, err := r.client.Do(req)
if err != nil {
return false
}
defer resp.Body.Close()
var permissions map[string][]string
err = json.NewDecoder(resp.Body).Decode(&permissions)
if err != nil {
return false
}
return shared.StringInSlice("admin", permissions[""])
}
func (r *Server) syncPermissions(username string) error {
u, err := url.Parse(r.apiURL)
if err != nil {
return err
}
values := url.Values{}
values.Set("u", username)
u.RawQuery = values.Encode()
u.Path = path.Join(u.Path, "/api/service/v1/resources/project/permissions-for-user")
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return err
}
resp, err := r.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
var permissions map[string][]string
err = json.NewDecoder(resp.Body).Decode(&permissions)
if err != nil {
return err
}
if r.syncAdmin(username) {
permissions[""] = []string{"admin"}
}
// No need to acquire the lock since the caller (HasPermission) already has it.
r.permissions[username] = permissions
return nil
}
func (r *Server) postResources(updates []rbacResource, removals []string, force bool) error {
// Make sure that we have a baseline sync in place
if !force && r.lastSyncID == "" {
return r.SyncProjects()
}
// Generate the URL
u, err := url.Parse(r.apiURL)
if err != nil {
return err
}
u.Path = path.Join(u.Path, "/api/service/v1/resources/project")
// Prepare the request body
resourcePost := rbacResourcePost{
Updates: updates,
Removals: removals,
}
if force {
resourcePost.LastSyncID = nil
} else {
resourcePost.LastSyncID = &r.lastSyncID
}
body, err := json.Marshal(&resourcePost)
if err != nil {
return err
}
// Perform the request
req, err := http.NewRequest("POST", u.String(), bytes.NewReader(body))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
resp, err := r.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
// Handle errors
if resp.StatusCode == 409 {
// Sync IDs don't match, force sync
return r.SyncProjects()
} else if resp.StatusCode != http.StatusOK {
// Something went wrong
return errors.New(resp.Status)
}
// Extract the new SyncID
var postRespose rbacResourcePostResponse
err = json.NewDecoder(resp.Body).Decode(&postRespose)
if err != nil {
return err
}
r.lastSyncID = postRespose.SyncID
return nil
}