pax_global_header00006660000000000000000000000064126440020440014506gustar00rootroot0000000000000052 comment=5bc02c6756c4769626ff10f1e707cdf9bded5e82 paxrat-1.0/000077500000000000000000000000001264400204400126455ustar00rootroot00000000000000paxrat-1.0/.gitignore000066400000000000000000000000241264400204400146310ustar00rootroot00000000000000*.swp *.swo paxrat paxrat-1.0/LICENSE000066400000000000000000001045131264400204400136560ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. 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The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . paxrat-1.0/README.md000066400000000000000000000042021264400204400141220ustar00rootroot00000000000000# paxrat paxrat is a utility to set PaX flags on a set of binaries. Subgraph OS uses paxrat to maintain the PaX flags while running in installed and live mode. It should also work out of the box on other Debian-based operating systems. Other Linux variants have not tested but in theory it should also work provided the paths in the config file are correct (as well as the hard-coded path to the `paxctl` binary). ## Use cases paxrat is designed to address a number of use cases currently not supported by other utilities with a similar purpose. It supports the following use cases: 1. Running in file-systems that support extended file attributes as well as those that don't (such as SquashFS in a live disc or docker container) 2. Runnable as a hook to a package manager such as dpkg 3. Runnable in inotify-based watcher mode to set flags when files have changed such as during system updates (similar to [paxctld](https://grsecurity.net/download.php)) 4. Setting flags on a batch of binaries or just one # Configuration paxrat configuration is provided via a JSON file that lists each binary, the PaX flags, and a `nonroot` setting to specify whether the target binary is not root-owned (paxrat will not set PaX flags on non-root owned binaries unless this is set to `true`). ## Configuration example The following is an example configuration: ```json { "/usr/lib/iceweasel/iceweasel": { "flags": "pm" }, "/usr/lib/iceweasel/plugin-container": { "flags": "m" }, "/home/user/.local/share/torbrowser/tbb/x86_64/tor-browser_en-US/Browser/firefox": { "flags": "pm", "nonroot": true } } ``` # Usage ## Set flags on a single binary ```sh $ sudo paxrat -s pm -b /usr/lib/iceweasel/iceweasel ``` ## Set all flags from a config file ```sh $ sudo paxrat -c paxrat.conf ``` ## Test to make sure the provided config file is valid ```sh $ sudo paxrat -c paxrat.conf -t ``` ## Run in watcher mode ```sh $ sudo paxrat -c paxrat.conf -w ``` paxrat-1.0/etc/000077500000000000000000000000001264400204400134205ustar00rootroot00000000000000paxrat-1.0/etc/apt/000077500000000000000000000000001264400204400142045ustar00rootroot00000000000000paxrat-1.0/etc/apt/apt.conf.d/000077500000000000000000000000001264400204400161365ustar00rootroot00000000000000paxrat-1.0/etc/apt/apt.conf.d/70paxrat000077500000000000000000000001011264400204400175220ustar00rootroot00000000000000DPkg::Post-Invoke { "/sbin/paxrat -c /etc/paxrat/paxrat.conf";} paxrat-1.0/paxrat.conf000066400000000000000000000026311264400204400150150ustar00rootroot00000000000000{ "/usr/bin/gnome-shell": { "flags": "mr" }, "/usr/lib/gnome-session/gnome-session-check-accelerated": { "flags": "m" }, "/usr/lib/gnome-session/gnome-session-check-accelerated-helper": { "flags": "m" }, "/usr/lib/gnome-session/gnome-session-failed": { "flags": "m" }, "/usr/bin/seahorse": { "flags": "m" }, "/usr/bin/grub-bios-setup": { "flags": "E" }, "/usr/sbin/grub-mkdevicemap": { "flags": "E" }, "/usr/sbin/grub-probe": { "flags": "E" }, "/usr/bin/grub-script-check": { "flags": "E" }, "/usr/bin/grub-mount": { "flags": "m" }, "/usr/sbin/grub-probe": { "flags": "m" }, "/usr/bin/mplayer": { "flags": "m" }, "/usr/bin/python2": { "flags": "m" }, "/usr/bin/python3": { "flags": "m" }, "/usr/bin/vlc": { "flags": "m" }, "/usr/lib/libreoffice/program/soffice.bin": { "flags": "m" }, "/usr/lib/openoffice/program/unopkg.bin": { "flags": "m" }, "/usr/lib/policy-kit-1/polkitd": { "flags": "mr" }, "/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java": { "flags": "mr" }, "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac": { "flags": "mr" }, "/usr/lib/jvm/java-7-openjdk-amd64/bin/jar": { "flags": "m" }, "/usr/bin/gdbus": { "flags": "mr" }, "/usr/lib/iceweasel/iceweasel": { "flags": "pm" }, "/usr/lib/iceweasel/plugin-container": { "flags": "m" } } paxrat-1.0/paxrat.go000066400000000000000000000236761264400204400145110ustar00rootroot00000000000000// AUthor: David McKinney // Copyright (C) 2014-2015 Subgraph package main import ( "bufio" "encoding/json" "flag" "fmt" "log" "log/syslog" "os" "os/exec" "os/user" "path/filepath" "regexp" "strings" "syscall" "golang.org/x/exp/inotify" ) var configvar string var testvar bool var watchvar bool var flagsvar string var binaryvar string var nonrootvar bool type Setting struct { Flags string `json:"flags"` Nonroot bool `json:"nonroot,omitempty"` } type Config struct { Settings map[string]Setting } var InotifyFlags uint32 var InotifyDirFlags uint32 var Conf *Config var LogWriter *syslog.Writer var SyslogError error var commentRegexp = regexp.MustCompile("^[ \t]*#") func init() { LogWriter, SyslogError = syslog.New(syslog.LOG_INFO, "paxrat") if SyslogError != nil { // TODO: We should continue running and log to STDOUT instead using same LogWriter interface fmt.Println(SyslogError) os.Exit(0) // Exit cleanly for dpkg } InotifyFlags = (inotify.IN_DONT_FOLLOW | inotify.IN_ATTRIB | inotify.IN_CREATE | inotify.IN_DELETE_SELF | inotify.IN_MOVE_SELF | inotify.IN_MOVED_TO) InotifyDirFlags = (inotify.IN_DONT_FOLLOW | inotify.IN_CREATE | inotify.IN_DELETE_SELF | inotify.IN_MOVE_SELF | inotify.IN_MOVED_TO) Conf = new(Config) flag.StringVar(&configvar, "c", "/etc/paxrat/paxrat.conf", "Pax flags configuration file") flag.BoolVar(&testvar, "t", false, "Test the config file and then exit") flag.BoolVar(&watchvar, "w", false, "Run paxrat in watch mode") flag.StringVar(&flagsvar, "s", "", "Set PaX flags for a single binary (must also specify binary)") flag.BoolVar(&nonrootvar, "n", false, "Set nonroot variable for a single binary (needed to set flags on a non-root owned binary") flag.StringVar(&binaryvar, "b", "", "Path to a binary for use with set option") } func (conf *Config) readConfig(path string) (err error) { file, err := os.Open(path) if err != nil { log.Fatal(err) } scanner := bufio.NewScanner(file) out := "" for scanner.Scan() { line := scanner.Text() if !commentRegexp.MatchString(line) { out += line + "\n" } } var data = &conf.Settings err = json.Unmarshal([]byte(out), data) if err != nil { log.Fatal(err) } return } func pathExists(path string) (result bool) { if _, err := os.Stat(path); err == nil { result = true } return } func validateFlags(flags string) (err error) { match, _ := regexp.MatchString("(?i)[^pemrxs]", flags) if match { err = fmt.Errorf("Bad characters found in PaX flags: %s", flags) } return } func setWithXattr(path string, flags string) (err error) { err = syscall.Setxattr(path, "user.pax.flags", []byte(flags), 0) return } func setWithPaxctl(path string, flags string) (err error) { exists := pathExists("/sbin/paxctl") if !exists { msg := fmt.Sprintf( "/sbin/paxctl does not exist, cannot set '%s' PaX flags on %s.\n", flags, path) LogWriter.Info(msg) return } flagsFmt := fmt.Sprintf("-%s", flags) args := []string{"-c", flagsFmt, path} log.Println(args) // TODO: Deal with errors from paxctl if err = exec.Command("/sbin/paxctl", args...).Run(); err != nil { fmt.Fprintln(os.Stderr, err) return } return } func setFlags(path string, flags string, nonroot bool) (err error) { root, err := runningAsRoot() if !root { log.Fatal("paxrat must be run as root to set PaX flags.") } err = validateFlags(flags) if err != nil { return } supported, err := isXattrSupported() if err != nil { return } fiPath, err := os.Lstat(path) if err != nil { if os.IsNotExist(err) { err = fmt.Errorf("%s does not exist, cannot set flags", path) } return } linkUid := fiPath.Sys().(*syscall.Stat_t).Uid // Throw error if nonroot option is not set but the file is owned by a user other than root if !nonroot && linkUid > 0 { err = fmt.Errorf( "Cannot set PaX flags on %s. Owner of symlink did not match owner of symlink target\n", path) return } // Resolve the symlink target realpath, err := filepath.EvalSymlinks(path) if err != nil { return } fiRPath, err := os.Lstat(realpath) if err != nil { if os.IsNotExist(err) { err = fmt.Errorf("%s does not exist, cannot set flags", path) } return } targetUid := fiRPath.Sys().(*syscall.Stat_t).Uid // If nonroot is set then throw an error if the owner of the file is different than the owner of the symlink target if nonroot && targetUid != linkUid { err = fmt.Errorf( "Cannot set PaX flags on %s. Owner of symlink did not match owner of symlink target\n", path) return } if supported { msg := fmt.Sprintf("Setting '%s' PaX flags via xattr on %s\n", flags, path) LogWriter.Info(msg) err = setWithXattr(path, flags) if err != nil { return } } else { msg := fmt.Sprintf("Setting '%s' PaX flags via paxctl on %s\n", flags, path) LogWriter.Info(msg) err = setWithPaxctl(path, flags) if err != nil { listFlags(path) return } } return } func setFlagsWatchMode(watcher *inotify.Watcher, path string, flags string, nonroot bool) (err error) { watcher.RemoveWatch(path) setFlags(path, flags, nonroot) if err != nil { return (err) } addWatchToClosestPath(watcher, path) return } func setFlagsFromConfig() { for path, setting := range (*Conf).Settings { err := setFlags(path, setting.Flags, setting.Nonroot) if err != nil { log.Println(err) } } } func listFlags(path string) (err error) { exists := pathExists(path) if !exists { log.Printf("%s does not exist, cannot check PaX flags.\n", path) return } supported, err := isXattrSupported() if err != nil { return } if supported { var flags []byte sz, err := syscall.Getxattr(path, "user.pax.flags", flags) if err != nil { log.Println(err) } log.Println(sz) log.Println(flags) } else { args := []string{"-v", path} log.Println(args) exec.Command("/sbin/paxctl").Run() fmt.Fprintln(os.Stdout) out, err := exec.Command("/sbin/paxctl", args...).Output() if err != nil { log.Println(err) } log.Printf("%s\n", out) } return } func isXattrSupported() (result bool, err error) { result = true setXattrErr := syscall.Setxattr("/proc/self/exe", "user.test xattr", []byte("test xattr data"), 0) if setXattrErr != nil { errno := setXattrErr.(syscall.Errno) // syscall.Setxattr will return 'read-only filesystem' errors on a live-disc in live mode if errno == syscall.EOPNOTSUPP || errno == syscall.EROFS { result = false } else { err = setXattrErr } } return } func runningAsRoot() (result bool, err error) { current, err := user.Current() if err != nil { log.Println(err) return } if current.Uid == "0" && current.Gid == "0" && current.Username == "root" { result = true } return } func addWatchToClosestPath(watcher *inotify.Watcher, path string) { err := watcher.AddWatch(path, InotifyFlags) for err != nil && err.(*os.PathError).Err == syscall.ENOENT && path != "/" { path = filepath.Dir(path) if path != "/" { err = watcher.AddWatch(path, InotifyDirFlags) } } } func initWatcher() (watcher *inotify.Watcher, err error) { LogWriter.Info("Initializing paxrat watcher") watcher, err = inotify.NewWatcher() if err != nil { return } for path, setting := range (*Conf).Settings { addWatchToClosestPath(watcher, path) err = setFlagsWatchMode(watcher, path, setting.Flags, setting.Nonroot) if err != nil { msg := fmt.Sprintf("setFlags error in initWatcher: %s", err) LogWriter.Err(msg) } } return } // TODO: Resolve some corner cases like watches not set after create, delete, create, move func runWatcher(watcher *inotify.Watcher) { LogWriter.Info("Starting paxrat watcher") for { select { case ev := <-watcher.Event: if ev.Mask == inotify.IN_CREATE { if _, ok := (*Conf).Settings[ev.Name]; ok { watcher.AddWatch(ev.Name, InotifyFlags) msg := fmt.Sprintf("File created: %s\n", ev.Name) LogWriter.Info(msg) } // Catch directory creation events for non-existent directories in executable path } else if ev.Mask == (inotify.IN_CREATE | inotify.IN_ISDIR) { for path, _ := range (*Conf).Settings { if strings.HasPrefix(path, ev.Name) { addWatchToClosestPath(watcher, path) } } } else if ev.Mask == inotify.IN_DELETE_SELF || ev.Mask == inotify.IN_MOVE_SELF { if _, ok := (*Conf).Settings[ev.Name]; ok { msg := fmt.Sprintf("File deleted: %s\n", ev.Name) LogWriter.Info(msg) parent := filepath.Dir(ev.Name) watcher.AddWatch(parent, InotifyDirFlags) continue } } else if ev.Mask == inotify.IN_ATTRIB { if _, ok := (*Conf).Settings[ev.Name]; ok { exists := pathExists(ev.Name) if !exists { msg := fmt.Sprintf("File deleted: %s\n", ev.Name) LogWriter.Info(msg) parent := filepath.Dir(ev.Name) watcher.AddWatch(parent, InotifyDirFlags) continue } else { msg := fmt.Sprintf("File attributes changed: %s", ev.Name) LogWriter.Info(msg) } } } if settings, ok := (*Conf).Settings[ev.Name]; ok { if ev.Mask != inotify.IN_IGNORED { err := setFlagsWatchMode(watcher, ev.Name, settings.Flags, settings.Nonroot) if err != nil { msg := fmt.Sprintf("watch mode setFlags error: %s", err) LogWriter.Err(msg) } } } case err := <-watcher.Error: msg := fmt.Sprintf("watch mode watcher error: %s", err) LogWriter.Err(msg) } } return } func main() { flag.Parse() if testvar { log.Printf("Reading config from: %s\n", configvar) err := Conf.readConfig(configvar) if err != nil { log.Fatal(err) } log.Printf("Configuration is valid\n") os.Exit(0) } else if binaryvar != "" && flagsvar != "" { err := setFlags(binaryvar, flagsvar, nonrootvar) if err != nil { log.Println(err) } os.Exit(0) } else { log.Printf("Reading config from: %s\n", configvar) err := Conf.readConfig(configvar) if err != nil { log.Fatal(err) } if watchvar { watcher, err := initWatcher() if err != nil { log.Fatalf("Could not initialize watcher: %s", err) } runWatcher(watcher) } else { setFlagsFromConfig() os.Exit(0) } } } paxrat-1.0/paxrat_test.go000066400000000000000000000052711264400204400155370ustar00rootroot00000000000000// AUthor: David McKinney // Copyright (C) 2014-2015 Subgraph package main import ( "fmt" "io/ioutil" "os" "testing" "time" ) func createTestConfig(path string, contents string) (err error) { err = ioutil.WriteFile(path, []byte(contents), 0600) if err != nil { return } return } func TestRunWatcher1(t *testing.T) { dir, err := ioutil.TempDir("", "inotify") if err != nil { t.Fatalf("TempDir failed: %s", err) } defer os.RemoveAll(dir) files := []string{dir + "/test1", dir + "/test2"} for _, file := range files { _, err = os.OpenFile(file, os.O_WRONLY|os.O_CREATE, 000) if err != nil { t.Fatalf("creating test file: %s", err) } } testJson := fmt.Sprintf( `{"%s/test1": {`+ `"flags": "mr",`+ `"nonroot": false},`+ `"%s/test2": {`+ `"flags": "E",`+ `"nonroot": false}}`, dir, dir) configPath := dir + "paxrat_conf.json" Conf = new(Config) err = createTestConfig(configPath, testJson) if err != nil { t.Fatalf("Could not create test config: %s", err) } err = Conf.readConfig(configPath) if err != nil { t.Fatalf("Could not load config: %s", err) } watcher, err := initWatcher() if err != nil { t.Fatalf("Failed to init watcher: %s", err) } done := make(chan bool) go func(done chan bool) { runWatcher(watcher) }(done) err = os.Remove(files[0]) if err != nil { t.Fatalf("Could not remove testFile1: %s", err) } err = os.Rename(files[1], dir+"moved") if err != nil { t.Fatalf("Could not move/rename TestFile2: %s", err) } _, err = os.OpenFile(files[0], os.O_WRONLY|os.O_CREATE, 0666) if err != nil { t.Fatalf("creating test file: %s", err) } time.Sleep(1 * time.Second) } func TestRunWatcher2(t *testing.T) { dir, err := ioutil.TempDir("", "inotify") if err != nil { t.Fatalf("TempDir failed: %s", err) } defer os.RemoveAll(dir) testJson := fmt.Sprintf( `{"%s/1/2/3/4/5/6/7/8/9/10/test1": {`+ `"flags": "mr",`+ `"nonroot": false}}`, dir) configPath := dir + "paxrat_conf.json" Conf = new(Config) err = createTestConfig(configPath, testJson) if err != nil { t.Fatalf("Could not create test config: %s", err) } err = Conf.readConfig(configPath) if err != nil { t.Fatalf("Could not load config: %s", err) } watcher, err := initWatcher() if err != nil { fmt.Println(dir) t.Fatalf("Failed to init watcher: %s", err) } done := make(chan bool) go func(done chan bool) { runWatcher(watcher) }(done) time.Sleep(1 * time.Second) os.MkdirAll(dir+"/1/2/3/4/5/6/7/8/9/10", 0600) time.Sleep(1 * time.Second) file := dir + "/1/2/3/4/5/6/7/8/9/10/test1" fmt.Printf("Creating test file: %s", file) os.OpenFile(file, os.O_WRONLY|os.O_CREATE, 000) if err != nil { t.Fatalf("creating test file: %s", err) } }