forked from future-architect/vuls
/
base.go
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/
base.go
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/* Vuls - Vulnerability Scanner
Copyright (C) 2016 Future Architect, Inc. Japan.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package scan
import (
"fmt"
"regexp"
"sort"
"strings"
"time"
"github.com/Sirupsen/logrus"
"github.com/future-architect/vuls/config"
"github.com/future-architect/vuls/cveapi"
"github.com/future-architect/vuls/models"
)
type base struct {
ServerInfo config.ServerInfo
Distro config.Distro
Platform models.Platform
osPackages
log *logrus.Entry
errs []error
}
func (l *base) ssh(cmd string, sudo bool) sshResult {
return sshExec(l.ServerInfo, cmd, sudo, l.log)
}
func (l *base) setServerInfo(c config.ServerInfo) {
l.ServerInfo = c
}
func (l base) getServerInfo() config.ServerInfo {
return l.ServerInfo
}
func (l *base) setDistro(fam, rel string) {
d := config.Distro{
Family: fam,
Release: rel,
}
l.Distro = d
s := l.getServerInfo()
s.Distro = d
l.setServerInfo(s)
}
func (l base) getDistro() config.Distro {
return l.Distro
}
func (l *base) setPlatform(p models.Platform) {
l.Platform = p
}
func (l base) getPlatform() models.Platform {
return l.Platform
}
func (l base) allContainers() (containers []config.Container, err error) {
switch l.ServerInfo.Container.Type {
case "", "docker":
stdout, err := l.dockerPs("-a --format '{{.ID}} {{.Names}}'")
if err != nil {
return containers, err
}
return l.parseDockerPs(stdout)
default:
return containers, fmt.Errorf(
"Not supported yet: %s", l.ServerInfo.Container.Type)
}
}
func (l *base) runningContainers() (containers []config.Container, err error) {
switch l.ServerInfo.Container.Type {
case "", "docker":
stdout, err := l.dockerPs("--format '{{.ID}} {{.Names}}'")
if err != nil {
return containers, err
}
return l.parseDockerPs(stdout)
default:
return containers, fmt.Errorf(
"Not supported yet: %s", l.ServerInfo.Container.Type)
}
}
func (l *base) exitedContainers() (containers []config.Container, err error) {
switch l.ServerInfo.Container.Type {
case "", "docker":
stdout, err := l.dockerPs("--filter 'status=exited' --format '{{.ID}} {{.Names}}'")
if err != nil {
return containers, err
}
return l.parseDockerPs(stdout)
default:
return containers, fmt.Errorf(
"Not supported yet: %s", l.ServerInfo.Container.Type)
}
}
func (l *base) dockerPs(option string) (string, error) {
cmd := fmt.Sprintf("docker ps %s", option)
r := l.ssh(cmd, noSudo)
if !r.isSuccess() {
return "", fmt.Errorf("Failed to SSH: %s", r)
}
return r.Stdout, nil
}
func (l *base) parseDockerPs(stdout string) (containers []config.Container, err error) {
lines := strings.Split(stdout, "\n")
for _, line := range lines {
fields := strings.Fields(line)
if len(fields) == 0 {
break
}
if len(fields) != 2 {
return containers, fmt.Errorf("Unknown format: %s", line)
}
containers = append(containers, config.Container{
ContainerID: fields[0],
Name: fields[1],
})
}
return
}
func (l *base) detectPlatform() error {
ok, instanceID, err := l.detectRunningOnAws()
if err != nil {
return err
}
if ok {
l.setPlatform(models.Platform{
Name: "aws",
InstanceID: instanceID,
})
return nil
}
//TODO Azure, GCP...
l.setPlatform(models.Platform{
Name: "other",
})
return nil
}
func (l base) detectRunningOnAws() (ok bool, instanceID string, err error) {
if r := l.ssh("type curl", noSudo); r.isSuccess() {
cmd := "curl --max-time 1 --retry 3 --noproxy 169.254.169.254 http://169.254.169.254/latest/meta-data/instance-id"
r := l.ssh(cmd, noSudo)
if r.isSuccess() {
id := strings.TrimSpace(r.Stdout)
if !l.isAwsInstanceID(id) {
return false, "", nil
}
return true, id, nil
}
switch r.ExitStatus {
case 28, 7:
// Not running on AWS
// 7 Failed to connect to host.
// 28 operation timeout.
return false, "", nil
}
}
if r := l.ssh("type wget", noSudo); r.isSuccess() {
cmd := "wget --tries=3 --timeout=1 --no-proxy -q -O - http://169.254.169.254/latest/meta-data/instance-id"
r := l.ssh(cmd, noSudo)
if r.isSuccess() {
id := strings.TrimSpace(r.Stdout)
if !l.isAwsInstanceID(id) {
return false, "", nil
}
return true, id, nil
}
switch r.ExitStatus {
case 4, 8:
// Not running on AWS
// 4 Network failure
// 8 Server issued an error response.
return false, "", nil
}
}
return false, "", fmt.Errorf(
"Failed to curl or wget to AWS instance metadata on %s. container: %s",
l.ServerInfo.ServerName, l.ServerInfo.Container.Name)
}
// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resource-ids.html
var awsInstanceIDPattern = regexp.MustCompile(`^i-[0-9a-f]+$`)
func (l base) isAwsInstanceID(str string) bool {
return awsInstanceIDPattern.MatchString(str)
}
func (l *base) convertToModel() (models.ScanResult, error) {
var scoredCves, unscoredCves models.CveInfos
for _, p := range l.UnsecurePackages {
if p.CveDetail.CvssScore(config.Conf.Lang) <= 0 {
unscoredCves = append(unscoredCves, models.CveInfo{
CveDetail: p.CveDetail,
Packages: p.Packs,
DistroAdvisories: p.DistroAdvisories, // only Amazon Linux
})
continue
}
cpenames := []models.CpeName{}
for _, cpename := range p.CpeNames {
cpenames = append(cpenames,
models.CpeName{Name: cpename})
}
cve := models.CveInfo{
CveDetail: p.CveDetail,
Packages: p.Packs,
DistroAdvisories: p.DistroAdvisories, // only Amazon Linux
CpeNames: cpenames,
}
scoredCves = append(scoredCves, cve)
}
container := models.Container{
ContainerID: l.ServerInfo.Container.ContainerID,
Name: l.ServerInfo.Container.Name,
}
sort.Sort(scoredCves)
sort.Sort(unscoredCves)
return models.ScanResult{
ServerName: l.ServerInfo.ServerName,
ScannedAt: time.Now(),
Family: l.Distro.Family,
Release: l.Distro.Release,
Container: container,
Platform: l.Platform,
KnownCves: scoredCves,
UnknownCves: unscoredCves,
Optional: l.ServerInfo.Optional,
}, nil
}
// scanVulnByCpeName search vulnerabilities that specified in config file.
func (l *base) scanVulnByCpeName() error {
unsecurePacks := CvePacksList{}
serverInfo := l.getServerInfo()
cpeNames := serverInfo.CpeNames
// remove duplicate
set := map[string]CvePacksInfo{}
for _, name := range cpeNames {
details, err := cveapi.CveClient.FetchCveDetailsByCpeName(name)
if err != nil {
return err
}
for _, detail := range details {
if val, ok := set[detail.CveID]; ok {
names := val.CpeNames
names = append(names, name)
val.CpeNames = names
set[detail.CveID] = val
} else {
set[detail.CveID] = CvePacksInfo{
CveID: detail.CveID,
CveDetail: detail,
CpeNames: []string{name},
}
}
}
}
for key := range set {
unsecurePacks = append(unsecurePacks, set[key])
}
unsecurePacks = append(unsecurePacks, l.UnsecurePackages...)
l.setUnsecurePackages(unsecurePacks)
return nil
}
func (l *base) setErrs(errs []error) {
l.errs = errs
}
func (l base) getErrs() []error {
return l.errs
}