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|
package hackers_git
import (
"inotify"
"inotify/inutil"
"os"
"path/filepath"
"sd_daemon/logger"
"sd_daemon/lsb"
)
const (
in_CHILD_ADD = inotify.IN_CREATE | inotify.IN_MOVED_TO
in_CHILD_DEL = inotify.IN_DELETE | inotify.IN_MOVED_FROM
in_CHILD_MOD = inotify.IN_CLOSE_WRITE | inotify.IN_MOVED_TO
in_CHILD_ANY = in_CHILD_ADD | in_CHILD_DEL | in_CHILD_MOD
in_DIR_INVALID = inotify.IN_MOVE_SELF | inotify.IN_DELETE_SELF
in_DIR = inotify.IN_ONLYDIR | in_DIR_INVALID
)
func (o *Hackers) watchHomedir(uid int32) {
wd, err := o.in_fd.AddWatch(o.users[uid].passwd.HomeDir, in_DIR|in_CHILD_ANY)
if err == nil {
oldwd, found := o.in_uid2wd[uid]
if found && oldwd != wd {
o.unwatchHomedir(oldwd)
}
o.in_uid2wd[uid] = wd
o.in_wd2uid[wd] = uid
} else {
delete(o.in_uid2wd, uid)
logger.Debug("hackers.git: %v", err)
}
o.load_user_password(uid)
}
func (o *Hackers) unwatchHomedir(wd inotify.Wd) {
err := o.in_fd.RmWatch(wd)
if err != nil {
logger.Warning("hackers.git: %v", err)
return
}
uid := o.in_wd2uid[wd]
delete(o.in_wd2uid, wd)
delete(o.in_uid2wd, uid)
o.load_user_password(uid)
}
func (o *Hackers) close() {
if o.in_fd != nil {
o.in_fd.Close()
defer o.workers.Wait()
}
o.in_wd_home = -1
o.in_wd_yaml = -1
o.users = make(map[int32]user, 0)
o.groups = make(map[string]map[string]bool)
o.in_uid2wd = make(map[int32]inotify.Wd, 0)
o.in_wd2uid = make(map[inotify.Wd]int32, 0)
}
func (o *Hackers) reload() (err error) {
o.close()
o.in_fd, err = inutil.WatcherInit() ; if err != nil { return }
o.in_wd_home, err = o.in_fd.AddWatch("/home" , in_DIR|in_CHILD_ADD); if err != nil { return }
o.in_wd_yaml, err = o.in_fd.AddWatch(o.Cfg.Yamldir, in_DIR|in_CHILD_ANY); if err != nil { return }
filenames, err := filepath.Glob(o.Cfg.Yamldir + "/*.yml")
o.users = make(map[int32]user, len(filenames))
o.groups = make(map[string]map[string]bool)
o.in_uid2wd = make(map[int32]inotify.Wd, len(filenames))
o.in_wd2uid = make(map[inotify.Wd]int32, len(filenames))
for _, filename := range filenames {
o.load_yaml_file(filename, false)
}
go func() {
defer lsb.Recover()
defer o.workers.Done()
o.worker()
}()
err = nil
return
}
func (o *Hackers) add_user_to_group(username string, groupname string) {
group, found := o.groups[groupname]
if !found {
group = make(map[string]bool)
o.groups[groupname] = group
}
group[username] = true
}
func (o *Hackers) del_user_from_group(username string, groupname string) {
group, found := o.groups[groupname]
if !found {
return
}
delete(group, username)
if len(group) < 1 {
delete(o.groups, groupname)
}
}
func (o *Hackers) load_yaml_file(filename string, uselock bool) {
logger.Debug("hackers.git: Loading YAML file: %s", filename)
user, err := parse_user_yaml(filename)
uid := user.passwd.UID
if err == nil {
logger.Debug("hackers.git: -> User %d added/updated", uid)
if uselock {
o.lock.Lock()
defer o.lock.Unlock()
}
if olduser, found := o.users[uid]; found {
for _, groupname := range olduser.groups {
o.del_user_from_group(olduser.passwd.Name, groupname)
}
}
for _, groupname := range user.groups {
o.add_user_to_group(user.passwd.Name, groupname)
}
o.users[uid] = user
o.watchHomedir(uid)
} else if uid >= 0 {
// User became invalid
logger.Debug("hackers.git: -> User %d invalidated: %v", uid, err)
if uselock {
o.lock.Lock()
defer o.lock.Unlock()
}
if wd, found := o.in_uid2wd[uid]; found {
o.unwatchHomedir(wd)
}
if olduser, found := o.users[uid]; found {
for _, groupname := range olduser.groups {
o.del_user_from_group(olduser.passwd.Name, groupname)
}
delete(o.users, uid)
}
} else {
logger.Debug("hackers.git: -> File ignored: %v", err)
}
}
func (o *Hackers) load_user_password(uid int32) {
user := o.users[uid]
user.passwd.PwHash = parse_user_password(user.passwd.HomeDir + "/.password")
o.users[uid] = user
}
func (o *Hackers) worker_watch_homedirs() {
for uid, _ := range o.users {
o.watchHomedir(uid)
}
}
func worker_error(format string, a ...interface{}) {
logger.Err("hackers.git: "+format, a)
os.Exit(int(lsb.EXIT_FAILURE))
}
func (o *Hackers) worker() {
err := os.Chdir(o.Cfg.Yamldir)
if err != nil {
worker_error("failed to load %q: %v", o.Cfg.Yamldir, err)
}
Loop:
for {
select {
case event, ok := <-o.in_fd.Events:
if !ok {
break Loop
}
switch event.Wd {
case o.in_wd_yaml:
// handle updates to yaml files
if event.Mask&in_DIR_INVALID != 0 {
err := o.Reload()
if err != nil {
worker_error("failed to reload hackers.git yaml directory: %v", err)
}
err = os.Chdir(o.Cfg.Yamldir)
if err != nil {
worker_error("failed to load %q: %v", o.Cfg.Yamldir, err)
}
} else if event.Mask&in_CHILD_ANY != 0 {
if event.Name == nil {
panic("recieved child event from inotify, but no child name")
}
o.load_yaml_file(o.Cfg.Yamldir + "/" + *event.Name, true)
} else {
panic("recieved non-subscribed inotify event from kernel")
}
case o.in_wd_home:
if event.Mask&in_DIR_INVALID != 0 {
err := o.Reload()
if err != nil {
panic(err)
}
} else if event.Mask&inotify.IN_ISDIR != 0 {
// handle added home directory
o.worker_watch_homedirs()
}
default:
// handle a change to someone's password
if event.Mask&in_DIR_INVALID != 0 {
o.unwatchHomedir(event.Wd)
o.worker_watch_homedirs()
} else if event.Name != nil {
if *event.Name == ".password" {
func() {
o.lock.Lock()
defer o.lock.Unlock()
o.load_user_password(o.in_wd2uid[event.Wd])
}()
}
} else {
logger.Debug("hackers.git: Event didn't match: %#v", event)
}
}
case err, ok := <-o.in_fd.Errors:
if !ok {
break Loop
}
logger.Warning("hackers.git: Inotify error: %v", err)
}
}
logger.Info("hackers.git: Stopped inotify watcher")
}
|
