login-validator: handle iPXE tpl
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parent
fdb66fcac1
commit
e08c9306da
@ -9,14 +9,10 @@ import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path"
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"strings"
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"text/template"
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"time"
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"gopkg.in/ldap.v2"
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@ -156,30 +152,35 @@ func (l loginChecker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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}
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// Find corresponding MAC
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var fname string
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var ip net.IP
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spl := strings.SplitN(r.RemoteAddr, ":", 2)
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if ip := net.ParseIP(spl[0]); ip == nil {
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if ip = net.ParseIP(spl[0]); ip == nil {
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http.Error(w, "Unable to parse given IPv4: " + spl[0], http.StatusInternalServerError)
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return
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} else if arptable, err := ARPAnalyze(); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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} else if arpent := ARPContainsIP(arptable, ip); arpent == nil {
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http.Error(w, "Unable to find MAC in ARP table", http.StatusInternalServerError)
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}
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var mac *ARPEntry
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if tab, err := ARPAnalyze(); err != nil {
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log.Println("Error on ARPAnalyze:", err)
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http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
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return
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} else {
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fname = fmt.Sprintf("%02x-%02x-%02x-%02x-%02x-%02x-%02x", arpent.HWType, arpent.HWAddress[0], arpent.HWAddress[1], arpent.HWAddress[2], arpent.HWAddress[3], arpent.HWAddress[4], arpent.HWAddress[5])
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mac = ARPContainsIP(tab, ip)
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}
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if mac == nil {
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log.Printf("Unable to find MAC address for given IP (%s)\n", ip)
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http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
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}
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// Register the user remotely
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if err := l.registerUser(lu.Username, r.RemoteAddr, fname); err != nil {
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if err := l.registerUser(lu.Username, r.RemoteAddr, *mac); err != nil {
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log.Println("Error on remote registration:", err)
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http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
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return
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}
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// Generate PXE file
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if err := l.lateLoginAction(lu.Username, r.RemoteAddr, fname); err != nil {
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if err := l.lateLoginAction(lu.Username, r.RemoteAddr, *mac); err != nil {
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log.Println("Error on late login action:", err)
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http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
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return
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@ -189,8 +190,8 @@ func (l loginChecker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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http.Error(w, "Success", http.StatusOK)
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}
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func (l loginChecker) registerUser(username, remoteAddr, mac string) error {
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bts, err := json.Marshal(map[string]interface{}{"login": username, "ip": remoteAddr, "mac": mac})
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func (l loginChecker) registerUser(username, remoteAddr string, ent ARPEntry) error {
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bts, err := json.Marshal(map[string]interface{}{"login": username, "ip": remoteAddr, "mac": fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", ent.HWAddress[0], ent.HWAddress[1], ent.HWAddress[2], ent.HWAddress[3], ent.HWAddress[4], ent.HWAddress[5])})
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if err != nil {
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return nil
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}
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@ -215,22 +216,6 @@ func (l loginChecker) registerUser(username, remoteAddr, mac string) error {
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}
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}
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func (l loginChecker) lateLoginAction(username, remoteAddr, fname string) error {
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if tpl, err := ioutil.ReadFile(path.Join(tftpDir, "pxelinux.cfg", "tpl")); err != nil {
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log.Println("Unable to open tpl: ", err)
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} else if file, err := os.OpenFile(path.Join(tftpDir, "pxelinux.cfg", fname), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0644)); err != nil {
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log.Println("Unable to open destination file: ", err)
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} else {
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defer file.Close()
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mac := hmac.New(sha512.New512_224, []byte(loginSalt))
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if configTmpl, err := template.New("pxelinux.cfg").Parse(string(tpl)); err != nil {
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log.Println("Cannot create template: ", err)
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} else if err := configTmpl.Execute(file, map[string]string{"username": username, "remoteAddr": remoteAddr, "pkey": fmt.Sprintf("%x", mac.Sum([]byte(username))), "fname": fname}); err != nil {
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log.Println("An error occurs during template execution: ", err)
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}
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}
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return nil
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func (l loginChecker) lateLoginAction(username, remoteAddr string, mac ARPEntry) error {
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return RegisterUserMAC(mac, username)
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}
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@ -1,7 +1,8 @@
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package main
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import (
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"errors"
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"crypto/hmac"
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"crypto/sha512"
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"fmt"
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"io/ioutil"
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"net"
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@ -11,32 +12,34 @@ import (
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)
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const pxeUserTplPath = "pxelinux.cfg/tpl"
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const ipxeUserTplPath = "pxelinux.cfg/tpl.ipxe"
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const pxeUserPath = "pxelinux.cfg"
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func RegisterUserMAC(ip net.IP, username string) error {
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if tab, err := ARPAnalyze(); err != nil {
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func RegisterUserMAC(ent ARPEntry, username string) error {
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if err := registerUser(ipxeUserTplPath, fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x.ipxe", ent.HWAddress[0], ent.HWAddress[1], ent.HWAddress[2], ent.HWAddress[3], ent.HWAddress[4], ent.HWAddress[5]), username); err != nil {
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return err
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} else if ent := ARPContainsIP(tab, ip); ent == nil {
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return errors.New(fmt.Sprintf("Unable to find MAC address for given IP (%s)", ip))
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} else {
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return registerUser(fmt.Sprintf("%02X-%02X-%02X-%02X-%02X-%02X-%02X", ent.HWType, ent.HWAddress[0], ent.HWAddress[1], ent.HWAddress[2], ent.HWAddress[3], ent.HWAddress[4], ent.HWAddress[5]), username)
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return registerUser(pxeUserTplPath, fmt.Sprintf("%02x-%02x-%02x-%02x-%02x-%02x-%02x", ent.HWType, ent.HWAddress[0], ent.HWAddress[1], ent.HWAddress[2], ent.HWAddress[3], ent.HWAddress[4], ent.HWAddress[5]), username)
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}
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}
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func RegisterUserIP(ip net.IP, username string) error {
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return registerUser(fmt.Sprintf("%02X%02X%02X%02X", ip.To4()[0], ip.To4()[1], ip.To4()[2], ip.To4()[3]), username)
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return registerUser(pxeUserTplPath, fmt.Sprintf("%02X%02X%02X%02X", ip.To4()[0], ip.To4()[1], ip.To4()[2], ip.To4()[3]), username)
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}
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func registerUser(filename string, username string) error {
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if pxeTplCnt, err := ioutil.ReadFile(path.Join(tftpDir, pxeUserTplPath)); err != nil {
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func registerUser(tplPath string, filename string, username string) error {
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if pxeTplCnt, err := ioutil.ReadFile(path.Join(tftpDir, tplPath)); err != nil {
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return err
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} else if userfd, err := os.OpenFile(path.Join(tftpDir, pxeUserPath, filename), os.O_RDWR|os.O_CREATE, 0644); err != nil {
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return err
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} else {
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defer userfd.Close()
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pkey := hmac.New(sha512.New512_224, []byte(loginSalt))
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if pxeTmpl, err := template.New("pxeUser").Parse(string(pxeTplCnt)); err != nil {
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return err
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} else if err := pxeTmpl.Execute(userfd, map[string]string{"username": username}); err != nil {
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} else if err := pxeTmpl.Execute(userfd, map[string]string{"username": username, "pkey": fmt.Sprintf("%x", pkey.Sum([]byte(username)))}); err != nil {
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return err
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}
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}
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