Adding generation of cert and key, and dockerfile
This commit is contained in:
PierreZ
parent
38fe333888
commit
60df40beb9
5 changed files with 167 additions and 37 deletions
4
Dockerfile
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4
Dockerfile
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@ -0,0 +1,4 @@
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FROM centurylink/ca-certs
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COPY goStatic /
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ENTRYPOINT ["/goStatic"]
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2
Makefile
2
Makefile
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@ -1,4 +1,4 @@
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default: static
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static:
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docker run --rm -v $(pwd):/src centurylink/golang-builder
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docker run --rm -v $(shell pwd):/src centurylink/golang-builder
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31
README.md
31
README.md
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@ -4,17 +4,42 @@ A really small static web server for Docker
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### The goal
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My goal is to create to smallest docker container for my web static files. The advantage of Go is that you can generate a fully static binary, so that you don't need anything else.
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### Features
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* Web server build for Docker
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* HTTPS by default
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* Can generate certificate on his onw
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* Light container
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* More security than official images (see below)
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* Log enabled
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### Why?
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Because the official Golang image is wayyyy to big. (around 1/2Gb as you can see below)
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Because the official Golang image is wayyyy to big (around 1/2Gb as you can see below) and could be unsecure.
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[](https://imagelayers.io/?images=golang:latest 'Get your own badge on imagelayers.io')
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For me, the whole point of containers is to have a light container...
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Many links should provide you with additionnal info to see my point of view:
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* [Over 30% of Official Images in Docker Hub Contain High Priority Security Vulnerabilities](http://www.banyanops.com/blog/analyzing-docker-hub/)
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* [Create The Smallest Possible Docker Container](http://blog.xebia.com/2014/07/04/create-the-smallest-possible-docker-container/)
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* [Building Docker Images for Static Go Binaries](https://medium.com/@kelseyhightower/optimizing-docker-images-for-static-binaries-b5696e26eb07)
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* [Small Docker Images For Go Apps](http://www.centurylinklabs.com/small-docker-images-for-go-apps/)
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### What are you using?
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### How to use
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```
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// HTTPS server
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docker run -d -p 443:8043 -v path/to/website:/srv/http pierrezemb/goStatic
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// HTTP server
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docker run -d -p 80:8043 -v path/to/website:/srv/http pierrezemb/goStatic --forceHTTP
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```
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I'm using [echo](http://echo.labstack.com/) as a micro web framework because he has great performance, and [golang-builder](https://github.com/CenturyLinkLabs/golang-builder) to generate the static binary.
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### Wow, such container! What are you using?
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I'm using [echo](http://echo.labstack.com/) as a micro web framework because he has great performance, and [golang-builder](https://github.com/CenturyLinkLabs/golang-builder) to generate the static binary (command line in the makefile)
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I'm also using the centurylink/ca-certs image instead of the scratch image to avoid this error:
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```
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x509: failed to load system roots and no roots provided
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```
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The centurylink/ca-certs image is simply the scratch image with the most common root CA certificates pre-installed. The resulting image is only 258 kB which is still a good starting point for creating your own minimal images.
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BIN
goStatic
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BIN
goStatic
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167
main.go
167
main.go
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@ -1,6 +1,8 @@
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package main // import "github.com/PierreZ/goStatic"
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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@ -8,23 +10,35 @@ import (
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"encoding/pem"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"math/big"
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"net"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/labstack/echo"
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mw "github.com/labstack/echo/middleware"
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)
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func main() {
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var (
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// Def & parsing of flags
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portPtr := flag.Int("p", 8080, "The proxy listening port")
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pathPtr := flag.String("path for static file", "/var/www", "The path for the static files")
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crtPtr := flag.String("crt", "/etc/ssl/server", "The path and the name whithout extension for your CRT/key for TLS. Example: /etc/ssl/server for /etc/ssl/server.{crt,key}")
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HTTPPtr := flag.Bool("forceHTTP", false, "Forcing HTTP and not HTTPS")
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portPtr = flag.Int("p", 8043, "The listening port")
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pathPtr = flag.String("static", "/srv/http", "The path for the static files")
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crtPtr = flag.String("crt", "/etc/ssl/server", "Folder for server.pem and key.pem")
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HTTPPtr = flag.Bool("forceHTTP", false, "Forcing HTTP and not HTTPS")
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// var for cert
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host = flag.String("host", "", "Comma-separated hostnames and IPs to generate a certificate for")
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validFrom = flag.String("start-date", "", "Creation date formatted as Jan 1 15:04:05 2011")
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validFor = flag.Duration("duration", 365*24*time.Hour, "Duration that certificate is valid for")
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isCA = flag.Bool("ca", false, "whether this cert should be its own Certificate Authority")
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rsaBits = flag.Int("rsa-bits", 2048, "Size of RSA key to generate. Ignored if --ecdsa-curve is set")
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ecdsaCurve = flag.String("ecdsa-curve", "", "ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521")
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)
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func main() {
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flag.Parse()
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@ -45,54 +59,141 @@ func main() {
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// Start server with unsecure HTTP
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// or with awesome TLS
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if *HTTPPtr {
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log.Println("Starting serving", *pathPtr, "on", *portPtr)
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e.Run(port)
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} else {
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if *crtPtr != "/etc/ssl/server" {
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// Check for cert
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_, err := os.Stat(*crtPtr + "cert.pem")
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if err != nil {
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log.Println("Cert not found, generating .pem and .crt file")
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generateCert(*crtPtr)
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}
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e.RunTLS(port, *pathPtr+".pem", *pathPtr+".crt")
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log.Println("Starting serving", *pathPtr, "on", *portPtr)
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e.RunTLS(port, *crtPtr+"cert.pem", *crtPtr+"key.pem")
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}
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}
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// Mostly based on https://www.socketloop.com/tutorials/golang-create-x509-certificate-private-and-public-keys
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// Based on https://golang.org/src/crypto/tls/generate_cert.go
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func generateCert(path string) {
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var priv interface{}
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var err error
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switch *ecdsaCurve {
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case "":
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priv, err = rsa.GenerateKey(rand.Reader, *rsaBits)
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case "P224":
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priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
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case "P256":
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priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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case "P384":
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priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
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case "P521":
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priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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default:
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fmt.Fprintf(os.Stderr, "Unrecognized elliptic curve: %q", *ecdsaCurve)
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os.Exit(1)
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}
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if err != nil {
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log.Fatalf("failed to generate private key: %s", err)
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}
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template := &x509.Certificate{
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IsCA: true,
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BasicConstraintsValid: true,
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SubjectKeyId: []byte{1, 2, 3},
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SerialNumber: big.NewInt(1234),
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var notBefore time.Time
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if len(*validFrom) == 0 {
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notBefore = time.Now()
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} else {
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notBefore, err = time.Parse("Jan 2 15:04:05 2006", *validFrom)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to parse creation date: %s\n", err)
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os.Exit(1)
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}
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}
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notAfter := notBefore.Add(*validFor)
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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log.Fatalf("failed to generate serial number: %s", err)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Country: []string{"Earth"},
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Organization: []string{"Hooli"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().AddDate(5, 5, 5),
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// see http://golang.org/pkg/crypto/x509/#KeyUsage
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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// generate private key
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privatekey, err := rsa.GenerateKey(rand.Reader, 4096)
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hosts := strings.Split(*host, ",")
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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if *isCA {
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
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if err != nil {
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log.Println(err)
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log.Fatalf("Failed to create certificate: %s", err)
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}
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// save cert
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ioutil.WriteFile(path+".crt", cert, 0777)
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fmt.Println("certificate saved to", path+".crt")
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certOut, err := os.Create(path + "cert.pem")
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if err != nil {
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log.Fatalf("failed to open cert.pem for writing: %s", err)
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}
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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certOut.Close()
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log.Print("written cert.pem\n")
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// this will create plain text PEM file.
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pemfile, _ := os.Create(path + ".pem")
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var pemkey = &pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(privatekey)}
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pem.Encode(pemfile, pemkey)
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pemfile.Close()
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keyOut, err := os.OpenFile(path+"key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Print("failed to open key.pem for writing:", err)
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return
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}
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pem.Encode(keyOut, pemBlockForKey(priv))
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keyOut.Close()
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log.Print("written key.pem\n")
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}
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// Based on https://golang.org/src/crypto/tls/generate_cert.go
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func publicKey(priv interface{}) interface{} {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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default:
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return nil
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}
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}
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// Based on https://golang.org/src/crypto/tls/generate_cert.go
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func pemBlockForKey(priv interface{}) *pem.Block {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
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case *ecdsa.PrivateKey:
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b, err := x509.MarshalECPrivateKey(k)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
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os.Exit(2)
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}
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return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
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default:
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return nil
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}
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}
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