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api.go
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api.go
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package main
import (
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"regexp"
"strings"
"time"
"github.com/futurice/alley-oop/src/autocert"
"github.com/julienschmidt/httprouter"
)
type API struct {
Handler http.Handler
db Database
certmgr autocert.Manager
}
var (
hostnameRegexp = regexp.MustCompile("^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$")
)
func flattenParams(params []string) []string {
var flattened []string
if params == nil {
return nil
}
for _, param := range params {
for _, val := range strings.Split(param, ",") {
flattened = append(flattened, val)
}
}
return flattened
}
func haveAddressesChanged(original []net.IP, updated []net.IP) bool {
var (
originalMap = make(map[string]bool)
updatedMap = make(map[string]bool)
)
for _, ip := range original {
originalMap[ip.String()] = true
}
for _, ip := range updated {
updatedMap[ip.String()] = true
}
if len(originalMap) != len(updatedMap) {
return true
}
for ipstr, _ := range updatedMap {
if !originalMap[ipstr] {
return true
}
}
return false
}
func (api *API) index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
w.Header().Set("Cache-Control", "no-store, must-revalidate")
fmt.Fprintf(w, "alley-oop v1.1.2\n")
}
func (api *API) v1update(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
var (
hostnames []string
myips []string
ips []net.IP
)
w.Header().Set("Cache-Control", "no-store, must-revalidate")
// Use timeout of 10 seconds, should be enough for all needed updates
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
err := req.ParseForm()
if err != nil {
goto BadRequest
}
hostnames = flattenParams(req.Form["hostname"])
if hostnames == nil {
fmt.Fprintf(w, "notfqdn")
return
}
if len(hostnames) > 20 {
fmt.Fprintf(w, "numhost")
return
}
myips = flattenParams(req.Form["myip"])
if myips == nil {
goto BadRequest
}
for _, myip := range myips {
ip := net.ParseIP(myip)
if ip == nil {
goto BadRequest
} else if ip.To4() != nil || ip.To16() != nil {
ips = append(ips, ip)
} else {
goto BadRequest
}
}
for idx, hostname := range hostnames {
if idx != 0 {
fmt.Fprintf(w, "\n")
}
if !hostnameRegexp.MatchString(hostname) {
fmt.Fprintf(w, "notfqdn")
continue
}
domain := strings.ToLower(hostname)
origips, err := api.db.GetIPAddresses(ctx, domain)
if err == nil && !haveAddressesChanged(origips, ips) {
fmt.Fprintf(w, "nochg ")
} else {
fmt.Fprintf(w, "good ")
}
err = api.db.PutIPAddresses(ctx, domain, ips)
if err != nil {
fmt.Fprintf(w, "dnserr")
continue
}
for idx, ip := range ips {
if idx != 0 {
fmt.Fprintf(w, ",")
}
fmt.Fprintf(w, ip.String())
}
}
return
BadRequest:
fmt.Fprintf(w, "badrequest")
return
}
func (api *API) v1privatekey(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
err := req.ParseForm()
if err != nil {
http.Error(w, "parse error", http.StatusInternalServerError)
}
hostnames := req.Form["hostname"]
if len(hostnames) != 1 {
http.Error(w, "param error", http.StatusInternalServerError)
return
}
hostname := hostnames[0]
if !hostnameRegexp.MatchString(hostname) {
http.Error(w, "regexp error", http.StatusInternalServerError)
return
}
hello := &tls.ClientHelloInfo{ServerName: hostname}
cert, err := api.certmgr.GetCertificate(hello)
if err != nil {
http.Error(w, "cert error", http.StatusInternalServerError)
return
}
key, err := getPrivateKey(cert)
if err != nil {
http.Error(w, "private key error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/x-pem-file")
w.Header().Set("Cache-Control", "no-store, must-revalidate")
fmt.Fprintf(w, key)
}
func (api *API) v1certificate(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
err := req.ParseForm()
if err != nil {
http.Error(w, "parse error", http.StatusInternalServerError)
}
hostnames := req.Form["hostname"]
if len(hostnames) != 1 {
http.Error(w, "error", http.StatusInternalServerError)
return
}
hostname := hostnames[0]
if !hostnameRegexp.MatchString(hostname) {
http.Error(w, "error", http.StatusInternalServerError)
return
}
hello := &tls.ClientHelloInfo{ServerName: hostname}
cert, err := api.certmgr.GetCertificate(hello)
if err != nil {
http.Error(w, "error", http.StatusInternalServerError)
return
}
certs, err := getCertificates(cert)
if err != nil {
http.Error(w, "error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/x-pem-file")
w.Header().Set("Cache-Control", "no-store, must-revalidate")
fmt.Fprintf(w, certs)
}
type dbTxtHandler struct {
Database
}
func (db dbTxtHandler) PutTXTRecord(ctx context.Context, domain string, value string) {
if err := db.PutTXTValues(ctx, domain, []string{value}); err != nil {
// FIXME: Handle error
}
}
func (db dbTxtHandler) DeleteTXTRecord(ctx context.Context, domain string) {
if err := db.DeleteTXTValues(ctx, domain); err != nil {
// FIXME: Handle error
}
}
type dbCertCache struct {
Database
}
func (db dbCertCache) Get(ctx context.Context, name string) ([]byte, error) {
bytes, err := db.GetCertificate(ctx, name)
if bytes == nil {
return nil, autocert.ErrCacheMiss
}
return bytes, err
}
func (db dbCertCache) Put(ctx context.Context, name string, data []byte) error {
return db.PutCertificate(ctx, name, data)
}
func (db dbCertCache) Delete(ctx context.Context, name string) error {
return db.DeleteCertificate(ctx, name)
}
func BasicAuth(h httprouter.Handle, requiredUser, requiredPassword string) httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
// Get the Basic Authentication credentials
user, password, hasAuth := r.BasicAuth()
if hasAuth && user == requiredUser && password == requiredPassword {
// Delegate request to the given handle
h(w, r, ps)
} else {
// Request Basic Authentication otherwise
w.Header().Set("WWW-Authenticate", "Basic realm=Restricted")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
}
}
}
func NewAPI(auth authConfig, db Database) *API {
authWrapper := func(h httprouter.Handle) httprouter.Handle {
return BasicAuth(h, auth.Username, auth.Password)
}
api := &API{db: db}
router := httprouter.New()
router.GET("/", api.index)
router.GET("/v1/update", authWrapper(api.v1update))
router.GET("/v1/privatekey", authWrapper(api.v1privatekey))
router.GET("/v1/certificate", authWrapper(api.v1certificate))
api.Handler = router
manager := autocert.Manager{
Cache: dbCertCache{db},
Prompt: autocert.AcceptTOS,
}
manager.DNSHandler(dbTxtHandler{db})
api.certmgr = manager
return api
}