f8c0b38716
* fix(scan): exec yum-plugin-ps on RHEL6 and 7 * feat(yumps): get affected procs on RHEL6 and RHEL8 * feat(scan): get affected processes for each packages * tuning * feat(scan): get running procs for each pkgs on Debian, Ubuntu
655 lines
18 KiB
Go
655 lines
18 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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"fmt"
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"regexp"
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"strings"
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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/future-architect/vuls/util"
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"golang.org/x/xerrors"
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ver "github.com/knqyf263/go-rpm-version"
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)
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// https://github.com/serverspec/specinfra/blob/master/lib/specinfra/helper/detect_os/redhat.rb
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func detectRedhat(c config.ServerInfo) (bool, osTypeInterface) {
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if r := exec(c, "ls /etc/fedora-release", noSudo); r.isSuccess() {
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util.Log.Warnf("Fedora not tested yet: %s", r)
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return true, &unknown{}
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}
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if r := exec(c, "ls /etc/oracle-release", noSudo); r.isSuccess() {
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// Need to discover Oracle Linux first, because it provides an
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// /etc/redhat-release that matches the upstream distribution
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if r := exec(c, "cat /etc/oracle-release", noSudo); r.isSuccess() {
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re := regexp.MustCompile(`(.*) release (\d[\d\.]*)`)
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result := re.FindStringSubmatch(strings.TrimSpace(r.Stdout))
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if len(result) != 3 {
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util.Log.Warnf("Failed to parse Oracle Linux version: %s", r)
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return true, newOracle(c)
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}
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ora := newOracle(c)
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release := result[2]
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ora.setDistro(config.Oracle, release)
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return true, ora
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}
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}
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// https://bugzilla.redhat.com/show_bug.cgi?id=1332025
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// CentOS cloud image
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if r := exec(c, "ls /etc/centos-release", noSudo); r.isSuccess() {
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if r := exec(c, "cat /etc/centos-release", noSudo); r.isSuccess() {
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re := regexp.MustCompile(`(.*) release (\d[\d\.]*)`)
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result := re.FindStringSubmatch(strings.TrimSpace(r.Stdout))
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if len(result) != 3 {
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util.Log.Warnf("Failed to parse CentOS version: %s", r)
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return true, newCentOS(c)
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}
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release := result[2]
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switch strings.ToLower(result[1]) {
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case "centos", "centos linux":
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cent := newCentOS(c)
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cent.setDistro(config.CentOS, release)
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return true, cent
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default:
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util.Log.Warnf("Failed to parse CentOS: %s", r)
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}
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}
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}
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if r := exec(c, "ls /etc/redhat-release", noSudo); r.isSuccess() {
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// https://www.rackaid.com/blog/how-to-determine-centos-or-red-hat-version/
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// e.g.
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// $ cat /etc/redhat-release
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// CentOS release 6.5 (Final)
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if r := exec(c, "cat /etc/redhat-release", noSudo); r.isSuccess() {
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re := regexp.MustCompile(`(.*) release (\d[\d\.]*)`)
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result := re.FindStringSubmatch(strings.TrimSpace(r.Stdout))
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if len(result) != 3 {
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util.Log.Warnf("Failed to parse RedHat/CentOS version: %s", r)
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return true, newCentOS(c)
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}
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release := result[2]
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switch strings.ToLower(result[1]) {
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case "centos", "centos linux":
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cent := newCentOS(c)
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cent.setDistro(config.CentOS, release)
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return true, cent
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default:
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// RHEL
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rhel := newRHEL(c)
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rhel.setDistro(config.RedHat, release)
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return true, rhel
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}
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}
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}
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if r := exec(c, "ls /etc/system-release", noSudo); r.isSuccess() {
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family := config.Amazon
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release := "unknown"
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if r := exec(c, "cat /etc/system-release", noSudo); r.isSuccess() {
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if strings.HasPrefix(r.Stdout, "Amazon Linux release 2") {
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fields := strings.Fields(r.Stdout)
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release = fmt.Sprintf("%s %s", fields[3], fields[4])
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} else if strings.HasPrefix(r.Stdout, "Amazon Linux 2") {
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fields := strings.Fields(r.Stdout)
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release = strings.Join(fields[2:], " ")
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} else {
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fields := strings.Fields(r.Stdout)
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if len(fields) == 5 {
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release = fields[4]
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}
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}
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}
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amazon := newAmazon(c)
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amazon.setDistro(family, release)
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return true, amazon
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}
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util.Log.Debugf("Not RedHat like Linux. servername: %s", c.ServerName)
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return false, &unknown{}
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}
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// inherit OsTypeInterface
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type redhatBase struct {
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base
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sudo rootPriv
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}
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type rootPriv interface {
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repoquery() bool
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yumMakeCache() bool
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yumPS() bool
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}
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type cmd struct {
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cmd string
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expectedStatusCodes []int
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}
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var exitStatusZero = []int{0}
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func (o *redhatBase) execCheckIfSudoNoPasswd(cmds []cmd) error {
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for _, c := range cmds {
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cmd := util.PrependProxyEnv(c.cmd)
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o.log.Infof("Checking... sudo %s", cmd)
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r := o.exec(util.PrependProxyEnv(cmd), sudo)
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if !r.isSuccess(c.expectedStatusCodes...) {
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o.log.Errorf("Check sudo or proxy settings: %s", r)
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return xerrors.Errorf("Failed to sudo: %s", r)
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}
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}
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o.log.Infof("Sudo... Pass")
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return nil
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}
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func (o *redhatBase) execCheckDeps(packNames []string) error {
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for _, name := range packNames {
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cmd := "rpm -q " + name
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if r := o.exec(cmd, noSudo); !r.isSuccess() {
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msg := fmt.Sprintf("%s is not installed", name)
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o.log.Errorf(msg)
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return xerrors.New(msg)
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}
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}
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o.log.Infof("Dependencies ... Pass")
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return nil
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}
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func (o *redhatBase) preCure() error {
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if err := o.detectIPAddr(); err != nil {
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o.log.Warnf("Failed to detect IP addresses: %s", err)
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o.warns = append(o.warns, err)
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}
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// Ignore this error as it just failed to detect the IP addresses
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return nil
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}
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func (o *redhatBase) postScan() error {
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if o.isExecYumPS() {
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if err := o.yumPs(); err != nil {
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err = xerrors.Errorf("Failed to execute yum-ps: %w", err)
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o.log.Warnf("err: %+v", err)
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o.warns = append(o.warns, err)
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// Only warning this error
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}
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}
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if o.isExecNeedsRestarting() {
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if err := o.needsRestarting(); err != nil {
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err = xerrors.Errorf("Failed to execute need-restarting: %w", err)
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o.log.Warnf("err: %+v", err)
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o.warns = append(o.warns, err)
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// Only warning this error
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}
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}
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return nil
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}
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func (o *redhatBase) detectIPAddr() (err error) {
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o.log.Infof("Scanning in %s", o.getServerInfo().Mode)
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o.ServerInfo.IPv4Addrs, o.ServerInfo.IPv6Addrs, err = o.ip()
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return err
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}
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func (o *redhatBase) scanPackages() error {
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installed, err := o.scanInstalledPackages()
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if err != nil {
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o.log.Errorf("Failed to scan installed packages: %s", err)
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return err
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}
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o.Packages = installed
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rebootRequired, err := o.rebootRequired()
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if err != nil {
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err = xerrors.Errorf("Failed to detect the kernel reboot required: %w", err)
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o.log.Warnf("err: %+v", err)
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o.warns = append(o.warns, err)
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// Only warning this error
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} else {
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o.Kernel.RebootRequired = rebootRequired
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}
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if o.getServerInfo().Mode.IsOffline() {
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return nil
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} else if o.Distro.Family == config.RedHat {
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if o.getServerInfo().Mode.IsFast() {
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return nil
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}
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}
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updatable, err := o.scanUpdatablePackages()
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if err != nil {
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err = xerrors.Errorf("Failed to scan updatable packages: %w", err)
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o.log.Warnf("err: %+v", err)
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o.warns = append(o.warns, err)
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// Only warning this error
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} else {
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installed.MergeNewVersion(updatable)
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o.Packages = installed
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}
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return nil
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}
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func (o *redhatBase) rebootRequired() (bool, error) {
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r := o.exec("rpm -q --last kernel", noSudo)
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scanner := bufio.NewScanner(strings.NewReader(r.Stdout))
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if !r.isSuccess(0, 1) {
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return false, xerrors.Errorf("Failed to detect the last installed kernel : %v", r)
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}
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if !r.isSuccess() || !scanner.Scan() {
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return false, nil
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}
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lastInstalledKernelVer := strings.Fields(scanner.Text())[0]
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running := fmt.Sprintf("kernel-%s", o.Kernel.Release)
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return running != lastInstalledKernelVer, nil
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}
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func (o *redhatBase) scanInstalledPackages() (models.Packages, error) {
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release, version, err := o.runningKernel()
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if err != nil {
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return nil, err
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}
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o.Kernel = models.Kernel{
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Release: release,
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Version: version,
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}
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r := o.exec(rpmQa(o.Distro), noSudo)
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if !r.isSuccess() {
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return nil, xerrors.Errorf("Scan packages failed: %s", r)
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}
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installed, _, err := o.parseInstalledPackages(r.Stdout)
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if err != nil {
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return nil, err
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}
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return installed, nil
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}
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func (o *redhatBase) parseInstalledPackages(stdout string) (models.Packages, models.SrcPackages, error) {
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installed := models.Packages{}
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latestKernelRelease := ver.NewVersion("")
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// openssl 0 1.0.1e 30.el6.11 x86_64
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lines := strings.Split(stdout, "\n")
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for _, line := range lines {
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if trimed := strings.TrimSpace(line); len(trimed) != 0 {
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pack, err := o.parseInstalledPackagesLine(line)
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if err != nil {
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return nil, nil, err
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}
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// Kernel package may be isntalled multiple versions.
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// From the viewpoint of vulnerability detection,
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// pay attention only to the running kernel
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isKernel, running := isRunningKernel(pack, o.Distro.Family, o.Kernel)
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if isKernel {
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if o.Kernel.Release == "" {
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// When the running kernel release is unknown,
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// use the latest release among the installed release
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kernelRelease := ver.NewVersion(fmt.Sprintf("%s-%s", pack.Version, pack.Release))
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if kernelRelease.LessThan(latestKernelRelease) {
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continue
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}
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latestKernelRelease = kernelRelease
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} else if !running {
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o.log.Debugf("Not a running kernel. pack: %#v, kernel: %#v", pack, o.Kernel)
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continue
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} else {
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o.log.Debugf("Found a running kernel. pack: %#v, kernel: %#v", pack, o.Kernel)
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}
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}
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installed[pack.Name] = pack
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}
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}
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return installed, nil, nil
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}
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func (o *redhatBase) parseInstalledPackagesLine(line string) (models.Package, error) {
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fields := strings.Fields(line)
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if len(fields) != 5 {
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return models.Package{},
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xerrors.Errorf("Failed to parse package line: %s", line)
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}
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ver := ""
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epoch := fields[1]
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if epoch == "0" || epoch == "(none)" {
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ver = fields[2]
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} else {
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ver = fmt.Sprintf("%s:%s", epoch, fields[2])
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}
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return models.Package{
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Name: fields[0],
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Version: ver,
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Release: fields[3],
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Arch: fields[4],
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}, nil
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}
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func (o *redhatBase) yumMakeCache() error {
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cmd := `yum makecache`
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r := o.exec(util.PrependProxyEnv(cmd), o.sudo.yumMakeCache())
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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 nil
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}
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func (o *redhatBase) scanUpdatablePackages() (models.Packages, error) {
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if err := o.yumMakeCache(); err != nil {
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return nil, xerrors.Errorf("Failed to `yum makecache`: %w", err)
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}
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isDnf := o.exec(util.PrependProxyEnv(`repoquery --version | grep dnf`), o.sudo.repoquery()).isSuccess()
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cmd := `repoquery --all --pkgnarrow=updates --qf='%{NAME} %{EPOCH} %{VERSION} %{RELEASE} %{REPO}'`
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if isDnf {
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cmd = `repoquery --upgrades --qf='%{NAME} %{EPOCH} %{VERSION} %{RELEASE} %{REPONAME}' -q`
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}
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for _, repo := range o.getServerInfo().Enablerepo {
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cmd += " --enablerepo=" + repo
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}
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r := o.exec(util.PrependProxyEnv(cmd), o.sudo.repoquery())
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if !r.isSuccess() {
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return nil, xerrors.Errorf("Failed to SSH: %s", r)
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}
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// Collect Updateble packages, installed, candidate version and repository.
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return o.parseUpdatablePacksLines(r.Stdout)
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}
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// parseUpdatablePacksLines parse the stdout of repoquery to get package name, candidate version
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func (o *redhatBase) parseUpdatablePacksLines(stdout string) (models.Packages, error) {
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updatable := models.Packages{}
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lines := strings.Split(stdout, "\n")
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for _, line := range lines {
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// TODO remove
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// if strings.HasPrefix(line, "Obsoleting") ||
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// strings.HasPrefix(line, "Security:") {
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// // see https://github.com/future-architect/vuls/issues/165
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// continue
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// }
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if len(strings.TrimSpace(line)) == 0 {
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continue
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} else if strings.HasPrefix(line, "Loading") {
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continue
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}
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pack, err := o.parseUpdatablePacksLine(line)
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if err != nil {
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return updatable, err
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}
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updatable[pack.Name] = pack
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}
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return updatable, nil
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}
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func (o *redhatBase) parseUpdatablePacksLine(line string) (models.Package, error) {
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fields := strings.Fields(line)
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if len(fields) < 5 {
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return models.Package{}, xerrors.Errorf("Unknown format: %s, fields: %s", line, fields)
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}
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ver := ""
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epoch := fields[1]
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if epoch == "0" {
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ver = fields[2]
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} else {
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ver = fmt.Sprintf("%s:%s", epoch, fields[2])
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}
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repos := strings.Join(fields[4:], " ")
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p := models.Package{
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Name: fields[0],
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NewVersion: ver,
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NewRelease: fields[3],
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Repository: repos,
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}
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return p, nil
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}
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func (o *redhatBase) isExecYumPS() bool {
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switch o.Distro.Family {
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case config.Oracle,
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config.OpenSUSE,
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config.OpenSUSELeap,
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config.SUSEEnterpriseServer,
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config.SUSEEnterpriseDesktop,
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config.SUSEOpenstackCloud:
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return false
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}
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return !o.getServerInfo().Mode.IsFast()
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}
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func (o *redhatBase) isExecNeedsRestarting() bool {
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switch o.Distro.Family {
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case config.OpenSUSE,
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config.OpenSUSELeap,
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config.SUSEEnterpriseServer,
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config.SUSEEnterpriseDesktop,
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config.SUSEOpenstackCloud:
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// TODO zypper ps
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// https://github.com/future-architect/vuls/issues/696
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return false
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case config.RedHat, config.CentOS, config.Oracle:
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majorVersion, err := o.Distro.MajorVersion()
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if err != nil || majorVersion < 6 {
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o.log.Errorf("Not implemented yet: %s, err: %s", o.Distro, err)
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return false
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}
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if o.getServerInfo().Mode.IsOffline() {
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return false
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} else if o.getServerInfo().Mode.IsFastRoot() ||
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o.getServerInfo().Mode.IsDeep() {
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return true
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}
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return false
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}
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if o.getServerInfo().Mode.IsFast() {
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return false
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}
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return true
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}
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func (o *redhatBase) yumPs() error {
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stdout, err := o.ps()
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if err != nil {
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return xerrors.Errorf("Failed to yum ps: %w", err)
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}
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pidNames := o.parsePs(stdout)
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pidLoadedFiles := map[string][]string{}
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// for pid, name := range pidNames {
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for pid := range pidNames {
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stdout := ""
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stdout, err = o.lsProcExe(pid)
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if err != nil {
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o.log.Debugf("Failed to exec /proc/%s/exe err: %s", pid, err)
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continue
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}
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s, err := o.parseLsProcExe(stdout)
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if err != nil {
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o.log.Debugf("Failed to parse /proc/%s/exe: %s", pid, err)
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continue
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}
|
|
pidLoadedFiles[pid] = append(pidLoadedFiles[pid], s)
|
|
|
|
stdout, err = o.grepProcMap(pid)
|
|
if err != nil {
|
|
o.log.Debugf("Failed to exec /proc/%s/maps: %s", pid, err)
|
|
continue
|
|
}
|
|
ss := o.parseGrepProcMap(stdout)
|
|
pidLoadedFiles[pid] = append(pidLoadedFiles[pid], ss...)
|
|
}
|
|
|
|
for pid, loadedFiles := range pidLoadedFiles {
|
|
o.log.Debugf("rpm -qf: %#v", loadedFiles)
|
|
pkgNames, err := o.getPkgName(loadedFiles)
|
|
if err != nil {
|
|
o.log.Debugf("Failed to get package name by file path: %s, err: %s", pkgNames, err)
|
|
continue
|
|
}
|
|
|
|
uniq := map[string]struct{}{}
|
|
for _, name := range pkgNames {
|
|
uniq[name] = struct{}{}
|
|
}
|
|
|
|
procName := ""
|
|
if _, ok := pidNames[pid]; ok {
|
|
procName = pidNames[pid]
|
|
}
|
|
proc := models.AffectedProcess{
|
|
PID: pid,
|
|
Name: procName,
|
|
}
|
|
|
|
for fqpn := range uniq {
|
|
p, err := o.Packages.FindByFQPN(fqpn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
p.AffectedProcs = append(p.AffectedProcs, proc)
|
|
o.Packages[p.Name] = *p
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (o *redhatBase) needsRestarting() error {
|
|
initName, err := o.detectInitSystem()
|
|
if err != nil {
|
|
o.log.Warn(err)
|
|
// continue scanning
|
|
}
|
|
|
|
cmd := "LANGUAGE=en_US.UTF-8 needs-restarting"
|
|
r := o.exec(cmd, sudo)
|
|
if !r.isSuccess() {
|
|
return xerrors.Errorf("Failed to SSH: %w", r)
|
|
}
|
|
procs := o.parseNeedsRestarting(r.Stdout)
|
|
for _, proc := range procs {
|
|
fqpn, err := o.procPathToFQPN(proc.Path)
|
|
if err != nil {
|
|
o.log.Warnf("Failed to detect a package name of need restarting process from the command path: %s, %s",
|
|
proc.Path, err)
|
|
continue
|
|
}
|
|
pack, err := o.Packages.FindByFQPN(fqpn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if initName == systemd {
|
|
name, err := o.detectServiceName(proc.PID)
|
|
if err != nil {
|
|
o.log.Warn(err)
|
|
// continue scanning
|
|
}
|
|
proc.ServiceName = name
|
|
proc.InitSystem = systemd
|
|
}
|
|
pack.NeedRestartProcs = append(pack.NeedRestartProcs, proc)
|
|
o.Packages[pack.Name] = *pack
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (o *redhatBase) parseNeedsRestarting(stdout string) (procs []models.NeedRestartProcess) {
|
|
scanner := bufio.NewScanner(strings.NewReader(stdout))
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
line = strings.Replace(line, "\x00", " ", -1) // for CentOS6.9
|
|
ss := strings.Split(line, " : ")
|
|
if len(ss) < 2 {
|
|
continue
|
|
}
|
|
// https://unix.stackexchange.com/a/419375
|
|
if ss[0] == "1" {
|
|
continue
|
|
}
|
|
|
|
path := ss[1]
|
|
if !strings.HasPrefix(path, "/") {
|
|
path = strings.Fields(path)[0]
|
|
// [ec2-user@ip-172-31-11-139 ~]$ sudo needs-restarting
|
|
// 2024 : auditd
|
|
// [ec2-user@ip-172-31-11-139 ~]$ type -p auditd
|
|
// /sbin/auditd
|
|
cmd := fmt.Sprintf("LANGUAGE=en_US.UTF-8 which %s", path)
|
|
r := o.exec(cmd, sudo)
|
|
if !r.isSuccess() {
|
|
o.log.Warnf("Failed to exec which %s: %s", path, r)
|
|
continue
|
|
}
|
|
path = strings.TrimSpace(r.Stdout)
|
|
}
|
|
|
|
procs = append(procs, models.NeedRestartProcess{
|
|
PID: ss[0],
|
|
Path: path,
|
|
HasInit: true,
|
|
})
|
|
}
|
|
return
|
|
}
|
|
|
|
// procPathToFQPN returns Fully-Qualified-Package-Name from the command
|
|
func (o *redhatBase) procPathToFQPN(execCommand string) (string, error) {
|
|
execCommand = strings.Replace(execCommand, "\x00", " ", -1) // for CentOS6.9
|
|
path := strings.Fields(execCommand)[0]
|
|
cmd := `LANGUAGE=en_US.UTF-8 rpm -qf --queryformat "%{NAME}-%{EPOCH}:%{VERSION}-%{RELEASE}.%{ARCH}\n" ` + path
|
|
r := o.exec(cmd, noSudo)
|
|
if !r.isSuccess() {
|
|
return "", xerrors.Errorf("Failed to SSH: %s", r)
|
|
}
|
|
fqpn := strings.TrimSpace(r.Stdout)
|
|
return strings.Replace(fqpn, "-(none):", "-", -1), nil
|
|
}
|
|
|
|
func (o *redhatBase) getPkgName(paths []string) (pkgNames []string, err error) {
|
|
cmd := rpmQf(o.Distro) + strings.Join(paths, " ")
|
|
r := o.exec(util.PrependProxyEnv(cmd), noSudo)
|
|
if !r.isSuccess() {
|
|
return nil, xerrors.Errorf("Failed to SSH: %s", r)
|
|
}
|
|
|
|
scanner := bufio.NewScanner(strings.NewReader(r.Stdout))
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
pack, err := o.parseInstalledPackagesLine(line)
|
|
if err != nil {
|
|
o.log.Debugf("Failed to parse rpm -qf line: %s, r: %s. continue", line, r)
|
|
continue
|
|
}
|
|
pkgNames = append(pkgNames, pack.FQPN())
|
|
}
|
|
return pkgNames, nil
|
|
}
|