/
main.go
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/
main.go
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// Copyright 2015 FastVPS Eesti OU
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"encoding/json"
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"regexp"
"strconv"
"strings"
// for cert auth
"crypto/tls"
"crypto/x509"
)
var (
clair ClairAPI
openvzMirror string
tlsClient *http.Client
httpClient = &http.Client{}
certFile, keyFile, caFile string
)
type ClairAPI struct {
Address string `json:"adress"`
Port int `json:"port"`
HttpsEnable bool `json:"https_enable"`
MinimumPriority string
}
type AddLayoutRequestAPI struct {
ID string `json:"ID"`
Path string `json:"Path"`
ParentID string `json:"ParentID"`
ImageFormat string `json:"ImageFormat"`
}
type VulnerabilityItem struct {
ID string `json:"ID"`
Link string `json:"Link"`
Priority string `json:"Priority"`
Description string `json:"Description"`
}
type GetLayersVulnResponseAPI struct {
Vulnerabilities []VulnerabilityItem `json:"Vulnerabilities"`
}
type GetVersionsAnswer struct {
ApiVersion string `json:"APIVersion"`
EngineVersion string `json:"EngineVersion"`
}
func init() {
// Add logging
log.SetOutput(os.Stdout)
log.SetPrefix("main: ")
log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
// Flags
openvzMirrorFlag := flag.String("m", "https://download.openvz.org/template/precreated/", "Adress to link(directory - not supported yet) with precreated templates")
clairAddressFlag := flag.String("a", "127.0.0.1", "Adress to clair API")
clairPortFlag := flag.Int("p", 6060, "Adress to clair API")
clairMinPriorityFlag := flag.String("P", "High", "The minimum priority of the returned vulnerabilities")
certFileFlag := flag.String("cert", "", "A PEM encoded certificate file.")
keyFileFlag := flag.String("key", "", "A PEM encoded private key file.")
caFileFlag := flag.String("CA", "", "A PEM eoncoded CA's certificate file.")
flag.Parse()
openvzMirror = *openvzMirrorFlag
clair.Address = *clairAddressFlag
clair.Port = *clairPortFlag
var err error
clair.MinimumPriority, err = CheckPriority(*clairMinPriorityFlag)
if err != nil {
log.Fatal("Incorrect priority or priority check failed with error - ", err)
}
// We have cert auth keys
if len(*certFileFlag+*keyFileFlag+*caFileFlag) > 0 {
certFile, keyFile, caFile = *certFileFlag, *keyFileFlag, *caFileFlag
if len(*certFileFlag) > 0 && len(*keyFileFlag) > 0 && len(*caFileFlag) > 0 {
// Generate tls client
clair.HttpsEnable = true
tlsClient, err = CreateTlsClient(*certFileFlag, *keyFileFlag, *caFileFlag)
if err != nil {
log.Fatal("Cannot create tls client, please check previous errors")
}
} else {
fmt.Println("Please set cert,key and ca flags if you need client certificate auth for clair API")
os.Exit(1)
}
}
}
func main() {
fmt.Println("We use:")
fmt.Println("Clair - ", clair.Address+":"+strconv.Itoa(clair.Port))
versions, err := clair.GetVersions()
if err != nil {
log.Fatal("We cannot connet to clair ", err)
}
fmt.Println("We have clair with APIVersion:", versions.ApiVersion, "and EngineVersion:", versions.EngineVersion)
fmt.Println("OpenVZ mirror - ", openvzMirror)
isRemoteMirror, _ := regexp.MatchString(`(?i)^http(s)?\://`, openvzMirror)
var templateList []string
//var err error
if isRemoteMirror {
templateList, err = GetRemoteListing(openvzMirror)
} else {
templateList, err = GetLocalListing(openvzMirror)
}
if err != nil {
log.Fatal("Cannot get template listing - exit")
}
templateList = CleanZeroValuesFromArray(templateList)
fmt.Println("We have", len(templateList), "templates on mirror")
fmt.Println()
supportTemplates := regexp.MustCompile(`(?i)(ubuntu|debian|centos)`)
for _, template := range templateList {
if !supportTemplates.MatchString(template) {
log.Println("\"" + template + "\" not supported OS - continue")
continue
}
fmt.Println("Try to add ", template)
err = clair.AddLayer(openvzMirror, template)
if err != nil {
log.Println("Error - cannot add template", template)
} else {
fmt.Println(template, "added success")
fmt.Println("You can check it via:")
getResultCurl := clair.Address + ":" + strconv.Itoa(clair.Port) + "/v1/layers/" + template + "/vulnerabilities?minimumPriority=" + clair.MinimumPriority
if clair.HttpsEnable {
getResultCurl = "curl -s https://" + getResultCurl + " --cert " + certFile + " --key " + keyFile + " --cacert " + caFile
} else {
getResultCurl = "curl -s http://" + getResultCurl
}
getResultCurl = getResultCurl + " | python -m json.tool"
//fmt.Println("curl -s http://" + clair.Address + ":" + strconv.Itoa(clair.Port) + "/v1/layers/" + template + "/vulnerabilities?minimumPriority=" + clair.MinimumPriority + " | python -m json.tool")
fmt.Println(getResultCurl)
vulnList, err := clair.GetLayerVuln(template)
if err != nil {
fmt.Println("Cannot get vulnerabilities for this template - see errors and check it manual, please")
} else {
fmt.Println("Detect", len(vulnList), "vulnerabilities for this template")
}
fmt.Println()
}
}
}
func GetRemoteListing(adress string) (templateList []string, err error) {
result, err := http.Get(adress + "/.listing")
if err != nil {
log.Println("Cannot get listing via web from ", adress)
log.Println(err)
return
}
listingAnswerByte, err := ioutil.ReadAll(result.Body)
defer result.Body.Close()
if err != nil {
log.Println("Cannot get body from http responce with error ", err)
return
}
templateList = strings.Split(string(listingAnswerByte), "\n")
return
}
func GetLocalListing(directory string) (templateList []string, err error) {
result, err := ioutil.ReadFile(directory + "/.listing")
if err != nil {
log.Println("Cannot get listing via local file from ", directory)
log.Println(err)
return
}
templateList = strings.Split(string(result), "\n")
return
}
func CleanZeroValuesFromArray(array []string) []string {
var cleanArray []string
for _, value := range array {
if len(value) > 0 {
cleanArray = append(cleanArray, value)
}
}
return cleanArray
}
// https://github.com/coreos/clair/blob/master/docs/API.md#insert-a-new-layer
func (clair ClairAPI) AddLayer(openvzMirror string, templateName string) error {
var client *http.Client
url := clair.Address + ":" + strconv.Itoa(clair.Port) + "/v1/layers"
if clair.HttpsEnable {
url = "https://" + url
client = tlsClient
} else {
url = "http://" + url
client = httpClient
}
jsonRequest, err := json.Marshal(AddLayoutRequestAPI{ID: templateName, Path: openvzMirror + "/" + templateName + ".tar.gz", ImageFormat: "Docker"})
if err != nil {
log.Println("Cannot convert to json request with error: ", err)
return err
}
request, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonRequest))
if err != nil {
log.Println("Cannot generate request: ", err)
return err
}
request.Header.Set("Content-Type", "application/json")
//client := &http.Client{}
response, err := client.Do(request)
if err != nil {
log.Println("Send request failed request: ", err)
return err
}
// if OK - returned "201 Created"
if response.StatusCode != 201 {
defer response.Body.Close()
body, _ := ioutil.ReadAll(response.Body)
log.Println("Error - response not ok - ", response.Status, " with message: ", string(body))
return errors.New(string(body))
}
return nil
}
// https://github.com/coreos/clair/blob/master/docs/API.md#get-a-layers-vulnerabilities
func (clair ClairAPI) GetLayerVuln(templateName string) (vulnList []VulnerabilityItem, err error) {
var client *http.Client
url := clair.Address + ":" + strconv.Itoa(clair.Port) + "/v1/layers/" + templateName + "/vulnerabilities" + "?minimumPriority=" + clair.MinimumPriority
if clair.HttpsEnable {
url = "https://" + url
client = tlsClient
} else {
url = "http://" + url
client = httpClient
}
response, err := client.Get(url)
if err != nil {
log.Println("Send request failed request: ", err)
return vulnList, err
}
defer response.Body.Close()
body, _ := ioutil.ReadAll(response.Body)
// if OK - returned "200 OK"
if response.StatusCode != 200 {
log.Println("Error - response not ok - ", response.Status, " with message: ", string(body))
return vulnList, errors.New(string(body))
}
var result GetLayersVulnResponseAPI
err = json.Unmarshal(body, &result)
if err != nil {
log.Println("Cannot parse answer from clair to json: ", err)
return vulnList, err
}
vulnList = result.Vulnerabilities
return vulnList, nil
}
func (clair ClairAPI) GetVersions() (versions GetVersionsAnswer, err error) {
var client *http.Client
url := clair.Address + ":" + strconv.Itoa(clair.Port) + "/v1/versions"
if clair.HttpsEnable {
url = "https://" + url
client = tlsClient
} else {
url = "http://" + url
client = httpClient
}
response, err := client.Get(url)
if err != nil {
log.Println("Send request failed request: ", err)
return
}
defer response.Body.Close()
body, _ := ioutil.ReadAll(response.Body)
// if OK - returned "200 OK"
if response.StatusCode != 200 {
log.Println("Error - response not ok - ", response.Status, " with message: ", string(body))
return versions, errors.New(string(body))
}
err = json.Unmarshal(body, &versions)
if err != nil {
log.Println("Cannot parse answer from clair to json: ", err)
return
}
return
}
func CheckPriority(priority string) (result string, err error) {
// Acutal list see in type Priority in
// https://github.com/coreos/clair/blob/master/utils/types/priority.go
match, err := regexp.MatchString(`(?i)^(Unknown|Negligible|Low|Medium|High|Critical|Critical|Defcon1)$`, priority)
if err != nil {
return "", err
}
if match {
result = strings.ToUpper(string(priority[0])) + strings.ToLower(priority[1:])
return
}
return "", errors.New("Unknown priority " + priority)
}
func CreateTlsClient(certFile, keyFile, caFile string) (client *http.Client, err error) {
// Load client cert
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
log.Println("Cannot load client cert", err)
return
}
// Load CA cert
caCert, err := ioutil.ReadFile(caFile)
if err != nil {
log.Println("Cannot get caFile:", err)
return
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
// Setup HTTPS client
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
}
tlsConfig.BuildNameToCertificate()
transport := &http.Transport{TLSClientConfig: tlsConfig}
client = &http.Client{Transport: transport}
return
}