610 lines
16 KiB
Go
610 lines
16 KiB
Go
/* Vuls - Vulnerability Scanner
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Copyright (C) 2016 Future Corporation , Japan.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package scan
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import (
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"bufio"
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"encoding/json"
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"fmt"
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"net"
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"regexp"
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"strings"
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"time"
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"github.com/future-architect/vuls/config"
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"github.com/future-architect/vuls/models"
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"github.com/sirupsen/logrus"
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"golang.org/x/xerrors"
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)
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type base struct {
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ServerInfo config.ServerInfo
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Distro config.Distro
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Platform models.Platform
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osPackages
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WordPress *models.WordPressPackages
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log *logrus.Entry
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errs []error
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}
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func (l *base) exec(cmd string, sudo bool) execResult {
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return exec(l.ServerInfo, cmd, sudo, l.log)
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}
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func (l *base) setServerInfo(c config.ServerInfo) {
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l.ServerInfo = c
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}
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func (l *base) getServerInfo() config.ServerInfo {
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return l.ServerInfo
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}
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func (l *base) setDistro(fam, rel string) {
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d := config.Distro{
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Family: fam,
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Release: rel,
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}
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l.Distro = d
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s := l.getServerInfo()
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s.Distro = d
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l.setServerInfo(s)
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}
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func (l *base) getDistro() config.Distro {
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return l.Distro
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}
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func (l *base) setPlatform(p models.Platform) {
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l.Platform = p
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}
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func (l *base) getPlatform() models.Platform {
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return l.Platform
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}
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func (l *base) runningKernel() (release, version string, err error) {
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r := l.exec("uname -r", noSudo)
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if !r.isSuccess() {
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return "", "", xerrors.Errorf("Failed to SSH: %s", r)
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}
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release = strings.TrimSpace(r.Stdout)
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switch l.Distro.Family {
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case config.Debian:
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r := l.exec("uname -a", noSudo)
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if !r.isSuccess() {
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return "", "", xerrors.Errorf("Failed to SSH: %s", r)
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}
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ss := strings.Fields(r.Stdout)
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if 6 < len(ss) {
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version = ss[6]
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}
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}
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return
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}
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func (l *base) allContainers() (containers []config.Container, err error) {
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switch l.ServerInfo.ContainerType {
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case "", "docker":
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stdout, err := l.dockerPs("-a --format '{{.ID}} {{.Names}} {{.Image}}'")
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if err != nil {
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return containers, err
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}
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return l.parseDockerPs(stdout)
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case "lxd":
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stdout, err := l.lxdPs("-c n")
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if err != nil {
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return containers, err
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}
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return l.parseLxdPs(stdout)
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case "lxc":
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stdout, err := l.lxcPs("-1")
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if err != nil {
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return containers, err
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}
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return l.parseLxcPs(stdout)
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default:
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return containers, xerrors.Errorf(
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"Not supported yet: %s", l.ServerInfo.ContainerType)
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}
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}
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func (l *base) runningContainers() (containers []config.Container, err error) {
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switch l.ServerInfo.ContainerType {
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case "", "docker":
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stdout, err := l.dockerPs("--format '{{.ID}} {{.Names}} {{.Image}}'")
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if err != nil {
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return containers, err
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}
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return l.parseDockerPs(stdout)
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case "lxd":
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stdout, err := l.lxdPs("volatile.last_state.power=RUNNING -c n")
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if err != nil {
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return containers, err
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}
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return l.parseLxdPs(stdout)
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case "lxc":
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stdout, err := l.lxcPs("-1 --running")
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if err != nil {
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return containers, err
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}
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return l.parseLxcPs(stdout)
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default:
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return containers, xerrors.Errorf(
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"Not supported yet: %s", l.ServerInfo.ContainerType)
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}
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}
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func (l *base) exitedContainers() (containers []config.Container, err error) {
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switch l.ServerInfo.ContainerType {
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case "", "docker":
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stdout, err := l.dockerPs("--filter 'status=exited' --format '{{.ID}} {{.Names}} {{.Image}}'")
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if err != nil {
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return containers, err
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}
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return l.parseDockerPs(stdout)
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case "lxd":
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stdout, err := l.lxdPs("volatile.last_state.power=STOPPED -c n")
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if err != nil {
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return containers, err
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}
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return l.parseLxdPs(stdout)
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case "lxc":
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stdout, err := l.lxcPs("-1 --stopped")
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if err != nil {
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return containers, err
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}
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return l.parseLxcPs(stdout)
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default:
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return containers, xerrors.Errorf(
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"Not supported yet: %s", l.ServerInfo.ContainerType)
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}
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}
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func (l *base) dockerPs(option string) (string, error) {
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cmd := fmt.Sprintf("docker ps %s", option)
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r := l.exec(cmd, noSudo)
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if !r.isSuccess() {
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return "", xerrors.Errorf("Failed to SSH: %s", r)
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}
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return r.Stdout, nil
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}
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func (l *base) lxdPs(option string) (string, error) {
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cmd := fmt.Sprintf("lxc list %s", option)
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r := l.exec(cmd, noSudo)
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if !r.isSuccess() {
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return "", xerrors.Errorf("failed to SSH: %s", r)
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}
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return r.Stdout, nil
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}
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func (l *base) lxcPs(option string) (string, error) {
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cmd := fmt.Sprintf("lxc-ls %s 2>/dev/null", option)
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r := l.exec(cmd, sudo)
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if !r.isSuccess() {
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return "", xerrors.Errorf("failed to SSH: %s", r)
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}
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return r.Stdout, nil
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}
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func (l *base) parseDockerPs(stdout string) (containers []config.Container, err error) {
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lines := strings.Split(stdout, "\n")
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for _, line := range lines {
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fields := strings.Fields(line)
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if len(fields) == 0 {
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break
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}
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if len(fields) != 3 {
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return containers, xerrors.Errorf("Unknown format: %s", line)
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}
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containers = append(containers, config.Container{
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ContainerID: fields[0],
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Name: fields[1],
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Image: fields[2],
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})
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}
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return
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}
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func (l *base) parseLxdPs(stdout string) (containers []config.Container, err error) {
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lines := strings.Split(stdout, "\n")
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for i, line := range lines[3:] {
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if i%2 == 1 {
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continue
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}
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fields := strings.Fields(strings.Replace(line, "|", " ", -1))
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if len(fields) == 0 {
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break
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}
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if len(fields) != 1 {
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return containers, xerrors.Errorf("Unknown format: %s", line)
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}
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containers = append(containers, config.Container{
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ContainerID: fields[0],
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Name: fields[0],
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})
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}
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return
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}
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func (l *base) parseLxcPs(stdout string) (containers []config.Container, err error) {
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lines := strings.Split(stdout, "\n")
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for _, line := range lines {
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fields := strings.Fields(line)
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if len(fields) == 0 {
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break
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}
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containers = append(containers, config.Container{
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ContainerID: fields[0],
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Name: fields[0],
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})
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}
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return
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}
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// ip executes ip command and returns IP addresses
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func (l *base) ip() ([]string, []string, error) {
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// e.g.
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// 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000\ link/ether 52:54:00:2a:86:4c brd ff:ff:ff:ff:ff:ff
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// 2: eth0 inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
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// 2: eth0 inet6 fe80::5054:ff:fe2a:864c/64 scope link \ valid_lft forever preferred_lft forever
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r := l.exec("/sbin/ip -o addr", noSudo)
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if !r.isSuccess() {
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return nil, nil, xerrors.Errorf("Failed to detect IP address: %v", r)
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}
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ipv4Addrs, ipv6Addrs := l.parseIP(r.Stdout)
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return ipv4Addrs, ipv6Addrs, nil
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}
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// parseIP parses the results of ip command
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func (l *base) parseIP(stdout string) (ipv4Addrs []string, ipv6Addrs []string) {
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lines := strings.Split(stdout, "\n")
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for _, line := range lines {
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fields := strings.Fields(line)
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if len(fields) < 4 {
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continue
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}
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ip, _, err := net.ParseCIDR(fields[3])
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if err != nil {
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continue
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}
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if !ip.IsGlobalUnicast() {
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continue
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}
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if ipv4 := ip.To4(); ipv4 != nil {
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ipv4Addrs = append(ipv4Addrs, ipv4.String())
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} else {
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ipv6Addrs = append(ipv6Addrs, ip.String())
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}
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}
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return
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}
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func (l *base) detectPlatform() {
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if l.getServerInfo().Mode.IsOffline() {
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l.setPlatform(models.Platform{Name: "unknown"})
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return
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}
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ok, instanceID, err := l.detectRunningOnAws()
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if err != nil {
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l.setPlatform(models.Platform{Name: "other"})
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return
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}
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if ok {
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l.setPlatform(models.Platform{
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Name: "aws",
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InstanceID: instanceID,
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})
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return
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}
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//TODO Azure, GCP...
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l.setPlatform(models.Platform{Name: "other"})
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return
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}
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func (l *base) detectRunningOnAws() (ok bool, instanceID string, err error) {
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if r := l.exec("type curl", noSudo); r.isSuccess() {
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cmd := "curl --max-time 1 --noproxy 169.254.169.254 http://169.254.169.254/latest/meta-data/instance-id"
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r := l.exec(cmd, noSudo)
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if r.isSuccess() {
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id := strings.TrimSpace(r.Stdout)
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if !l.isAwsInstanceID(id) {
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return false, "", nil
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}
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return true, id, nil
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}
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switch r.ExitStatus {
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case 28, 7:
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// Not running on AWS
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// 7 Failed to connect to host.
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// 28 operation timeout.
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return false, "", nil
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}
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}
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if r := l.exec("type wget", noSudo); r.isSuccess() {
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cmd := "wget --tries=3 --timeout=1 --no-proxy -q -O - http://169.254.169.254/latest/meta-data/instance-id"
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r := l.exec(cmd, noSudo)
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if r.isSuccess() {
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id := strings.TrimSpace(r.Stdout)
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if !l.isAwsInstanceID(id) {
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return false, "", nil
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}
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return true, id, nil
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}
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switch r.ExitStatus {
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case 4, 8:
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// Not running on AWS
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// 4 Network failure
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// 8 Server issued an error response.
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return false, "", nil
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}
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}
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return false, "", xerrors.Errorf(
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"Failed to curl or wget to AWS instance metadata on %s. container: %s",
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l.ServerInfo.ServerName, l.ServerInfo.Container.Name)
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}
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// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resource-ids.html
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var awsInstanceIDPattern = regexp.MustCompile(`^i-[0-9a-f]+$`)
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func (l *base) isAwsInstanceID(str string) bool {
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return awsInstanceIDPattern.MatchString(str)
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}
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func (l *base) convertToModel() models.ScanResult {
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ctype := l.ServerInfo.ContainerType
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if l.ServerInfo.Container.ContainerID != "" && ctype == "" {
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ctype = "docker"
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}
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container := models.Container{
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ContainerID: l.ServerInfo.Container.ContainerID,
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Name: l.ServerInfo.Container.Name,
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Image: l.ServerInfo.Container.Image,
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Type: ctype,
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}
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errs := []string{}
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for _, e := range l.errs {
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errs = append(errs, fmt.Sprintf("%s", e))
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}
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scannedVia := scannedViaRemote
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if isLocalExec(l.ServerInfo.Port, l.ServerInfo.Host) {
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scannedVia = scannedViaLocal
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} else if l.ServerInfo.Type == config.ServerTypePseudo {
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scannedVia = scannedViaPseudo
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}
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return models.ScanResult{
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JSONVersion: models.JSONVersion,
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ServerName: l.ServerInfo.ServerName,
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ScannedAt: time.Now(),
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ScanMode: l.ServerInfo.Mode.String(),
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Family: l.Distro.Family,
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Release: l.Distro.Release,
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Container: container,
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Platform: l.Platform,
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IPv4Addrs: l.ServerInfo.IPv4Addrs,
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IPv6Addrs: l.ServerInfo.IPv6Addrs,
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ScannedCves: l.VulnInfos,
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ScannedVia: scannedVia,
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RunningKernel: l.Kernel,
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Packages: l.Packages,
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SrcPackages: l.SrcPackages,
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WordPressPackages: l.WordPress,
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Optional: l.ServerInfo.Optional,
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Errors: errs,
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}
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}
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func (l *base) setErrs(errs []error) {
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l.errs = errs
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}
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func (l *base) getErrs() []error {
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return l.errs
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}
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const (
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systemd = "systemd"
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upstart = "upstart"
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sysVinit = "init"
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)
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// https://unix.stackexchange.com/questions/196166/how-to-find-out-if-a-system-uses-sysv-upstart-or-systemd-initsystem
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func (l *base) detectInitSystem() (string, error) {
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var f func(string) (string, error)
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f = func(cmd string) (string, error) {
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r := l.exec(cmd, sudo)
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if !r.isSuccess() {
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return "", xerrors.Errorf("Failed to stat %s: %s", cmd, r)
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}
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scanner := bufio.NewScanner(strings.NewReader(r.Stdout))
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scanner.Scan()
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line := strings.TrimSpace(scanner.Text())
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if strings.Contains(line, "systemd") {
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return systemd, nil
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} else if strings.Contains(line, "upstart") {
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return upstart, nil
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} else if strings.Contains(line, "File: ‘/proc/1/exe’ -> ‘/sbin/init’") ||
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strings.Contains(line, "File: `/proc/1/exe' -> `/sbin/init'") {
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return f("stat /sbin/init")
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} else if line == "File: ‘/sbin/init’" ||
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line == "File: `/sbin/init'" {
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r := l.exec("/sbin/init --version", noSudo)
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if r.isSuccess() {
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if strings.Contains(r.Stdout, "upstart") {
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return upstart, nil
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}
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}
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return sysVinit, nil
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}
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return "", xerrors.Errorf("Failed to detect a init system: %s", line)
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}
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return f("stat /proc/1/exe")
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}
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func (l *base) detectServiceName(pid string) (string, error) {
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cmd := fmt.Sprintf("systemctl status --quiet --no-pager %s", pid)
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r := l.exec(cmd, noSudo)
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if !r.isSuccess() {
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return "", xerrors.Errorf("Failed to stat %s: %s", cmd, r)
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}
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return l.parseSystemctlStatus(r.Stdout), nil
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}
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func (l *base) parseSystemctlStatus(stdout string) string {
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scanner := bufio.NewScanner(strings.NewReader(stdout))
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scanner.Scan()
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line := scanner.Text()
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ss := strings.Fields(line)
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if len(ss) < 2 || strings.HasPrefix(line, "Failed to get unit for PID") {
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return ""
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}
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return ss[1]
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}
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func (l *base) scanWordPress() (err error) {
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wpOpts := []string{l.ServerInfo.WordPress.OSUser,
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l.ServerInfo.WordPress.DocRoot,
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l.ServerInfo.WordPress.CmdPath,
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l.ServerInfo.WordPress.WPVulnDBToken,
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}
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var isScanWp, hasEmptyOpt bool
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for _, opt := range wpOpts {
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if opt != "" {
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isScanWp = true
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break
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} else {
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hasEmptyOpt = true
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}
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}
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if !isScanWp {
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return nil
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}
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if hasEmptyOpt {
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return xerrors.Errorf("%s has empty WordPress opts: %s",
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l.getServerInfo().GetServerName(), wpOpts)
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}
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cmd := fmt.Sprintf("sudo -u %s -i -- %s cli version",
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l.ServerInfo.WordPress.OSUser,
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l.ServerInfo.WordPress.CmdPath)
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if r := exec(l.ServerInfo, cmd, noSudo); !r.isSuccess() {
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l.ServerInfo.WordPress.WPVulnDBToken = "secret"
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return xerrors.Errorf("Failed to exec `%s`. Check the OS user, command path of wp-cli, DocRoot and permission: %#v", cmd, l.ServerInfo.WordPress)
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}
|
||
|
||
wp, err := l.detectWordPress()
|
||
if err != nil {
|
||
return xerrors.Errorf("Failed to scan wordpress: %w", err)
|
||
}
|
||
l.WordPress = wp
|
||
return nil
|
||
}
|
||
|
||
func (l *base) detectWordPress() (*models.WordPressPackages, error) {
|
||
ver, err := l.detectWpCore()
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
themes, err := l.detectWpThemes()
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
plugins, err := l.detectWpPlugins()
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
pkgs := models.WordPressPackages{
|
||
models.WpPackage{
|
||
Name: models.WPCore,
|
||
Version: ver,
|
||
Type: models.WPCore,
|
||
},
|
||
}
|
||
pkgs = append(pkgs, themes...)
|
||
pkgs = append(pkgs, plugins...)
|
||
return &pkgs, nil
|
||
}
|
||
|
||
func (l *base) detectWpCore() (string, error) {
|
||
cmd := fmt.Sprintf("sudo -u %s -i -- %s core version --path=%s",
|
||
l.ServerInfo.WordPress.OSUser,
|
||
l.ServerInfo.WordPress.CmdPath,
|
||
l.ServerInfo.WordPress.DocRoot)
|
||
|
||
r := exec(l.ServerInfo, cmd, noSudo)
|
||
if !r.isSuccess() {
|
||
return "", xerrors.Errorf("Failed to get wp core version: %s", r)
|
||
}
|
||
return strings.TrimSpace(r.Stdout), nil
|
||
}
|
||
|
||
func (l *base) detectWpThemes() ([]models.WpPackage, error) {
|
||
cmd := fmt.Sprintf("sudo -u %s -i -- %s theme list --path=%s --format=json",
|
||
l.ServerInfo.WordPress.OSUser,
|
||
l.ServerInfo.WordPress.CmdPath,
|
||
l.ServerInfo.WordPress.DocRoot)
|
||
|
||
var themes []models.WpPackage
|
||
r := exec(l.ServerInfo, cmd, noSudo)
|
||
if !r.isSuccess() {
|
||
return nil, xerrors.Errorf("Failed to get a list of WordPress plugins: %s", r)
|
||
}
|
||
err := json.Unmarshal([]byte(r.Stdout), &themes)
|
||
if err != nil {
|
||
return nil, xerrors.Errorf("Failed to unmarshal wp theme list: %w", cmd, err)
|
||
}
|
||
for i := range themes {
|
||
themes[i].Type = models.WPTheme
|
||
}
|
||
return themes, nil
|
||
}
|
||
|
||
func (l *base) detectWpPlugins() ([]models.WpPackage, error) {
|
||
cmd := fmt.Sprintf("sudo -u %s -i -- %s plugin list --path=%s --format=json",
|
||
l.ServerInfo.WordPress.OSUser,
|
||
l.ServerInfo.WordPress.CmdPath,
|
||
l.ServerInfo.WordPress.DocRoot)
|
||
|
||
var plugins []models.WpPackage
|
||
r := exec(l.ServerInfo, cmd, noSudo)
|
||
if !r.isSuccess() {
|
||
return nil, xerrors.Errorf("Failed to wp plugin list: %s", r)
|
||
}
|
||
if err := json.Unmarshal([]byte(r.Stdout), &plugins); err != nil {
|
||
return nil, err
|
||
}
|
||
for i := range plugins {
|
||
plugins[i].Type = models.WPPlugin
|
||
}
|
||
return plugins, nil
|
||
}
|