301 lines
7.9 KiB
Go
301 lines
7.9 KiB
Go
package adlin
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import (
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"crypto/ed25519"
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"crypto/rand"
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"crypto/sha512"
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"encoding/base64"
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"fmt"
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"net"
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"os/exec"
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"strings"
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"sync"
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"time"
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)
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const StdNetmask = 80
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var (
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collector_secret ed25519.PrivateKey
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)
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func SetCollectorSecret(b []byte) {
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collector_secret = ed25519.NewKeyFromSeed(b)
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}
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func GetCollectorPublic() ed25519.PublicKey {
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return collector_secret.Public().(ed25519.PublicKey)
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}
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func StudentIP(idstd int64) net.IP {
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return net.ParseIP(fmt.Sprintf("2a01:e0a:2b:2252:%x::", idstd))
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}
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func StudentNet(idstd int64) *net.IPNet {
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return &net.IPNet{
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IP: StudentIP(idstd),
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Mask: net.CIDRMask(StdNetmask, 128),
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}
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}
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type WGDump struct {
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PubKey string
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PSK string
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Endpoint string
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AllowedIPs string
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LastHandS string
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RX string
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TX string
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KeepAlive string
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}
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func (d *WGDump) GetPubKey() ([]byte, error) {
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return base64.StdEncoding.DecodeString(d.PubKey)
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}
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var (
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wgDumpCache_data map[string]*WGDump = nil
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wgDumpCache_time time.Time
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wgDumpCache_mutex sync.RWMutex
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)
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func _readWgDump() (wgd map[string]*WGDump, err error) {
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out, errr := exec.Command("wg", "show", "wg-adlin", "dump").Output()
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if errr != nil {
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return nil, errr
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}
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wgd = map[string]*WGDump{}
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for _, line := range strings.Split(string(out), "\n") {
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cols := strings.Fields(line)
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if len(cols) != 8 {
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continue
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}
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wgd[cols[0]] = &WGDump{cols[0], cols[1], cols[2], cols[3], cols[4], cols[5], cols[6], cols[7]}
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}
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return
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}
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func readWgDump() (wgd map[string]*WGDump, err error) {
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wgDumpCache_mutex.RLock()
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defer wgDumpCache_mutex.RUnlock()
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wgd = wgDumpCache_data
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if time.Since(wgDumpCache_time) > time.Second*10 {
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wgDumpCache_mutex.RUnlock()
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wgDumpCache_mutex.Lock()
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if time.Since(wgDumpCache_time) > time.Second*10 {
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wgd, err = _readWgDump()
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if err != nil {
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wgDumpCache_mutex.Unlock()
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wgDumpCache_mutex.RLock()
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return
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}
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wgDumpCache_data = wgd
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wgDumpCache_time = time.Now()
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}
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wgDumpCache_mutex.Unlock()
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wgDumpCache_mutex.RLock()
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}
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return wgd, nil
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}
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type TunnelToken struct {
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token []byte
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TokenText string
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IdStudent int64
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PubKey []byte
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Time time.Time
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SuffixIP int
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// Version stores the TP number where the token is used
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Version int
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Dump *WGDump
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}
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func (tt *TunnelToken) GetStudentIP() string {
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if tt.SuffixIP == 0 {
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return fmt.Sprintf("%s%x", StudentIP(tt.IdStudent).String(), 1)
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} else {
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return fmt.Sprintf("%s%x", StudentIP(tt.IdStudent).String(), tt.SuffixIP)
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}
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}
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func (tt *TunnelToken) GenKeySign() []byte {
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stdprivkey := ed25519.NewKeyFromSeed(tt.token[:ed25519.SeedSize])
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stdpublic := []byte(stdprivkey.Public().(ed25519.PublicKey))
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return ed25519.Sign(collector_secret, stdpublic)
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}
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func TokenFromText(token string) []byte {
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sha := sha512.Sum512([]byte(token))
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return sha[:]
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}
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func GetTunnelToken(token []byte) (t *TunnelToken, err error) {
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t = new(TunnelToken)
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err = DBQueryRow("SELECT token, token_text, id_student, pubkey, time, suffixip, version FROM student_tunnel_tokens WHERE token=? ORDER BY time DESC", token).Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time, &t.SuffixIP, &t.Version)
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if err == nil && t.PubKey != nil {
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if wgd, errr := readWgDump(); errr == nil {
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if v, ok := wgd[base64.StdEncoding.EncodeToString(t.PubKey)]; ok {
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t.Dump = v
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}
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}
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}
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return
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}
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func (student *Student) NewTunnelToken(suffixip int) (t *TunnelToken, err error) {
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tok := make([]byte, 7)
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if _, err = rand.Read(tok); err != nil {
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return
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}
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t = new(TunnelToken)
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t.TokenText = strings.Replace(strings.Replace(strings.Replace(strings.Replace(strings.Replace(base64.RawStdEncoding.EncodeToString(tok), "/", ".", -1), "+", "_", -1), "O", "<", -1), "l", "$", -1), "I", ">", -1)
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t.token = TokenFromText(t.TokenText)
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t.IdStudent = student.Id
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_, err = DBExec("INSERT INTO student_tunnel_tokens (token, token_text, id_student, time, suffixip, version) VALUES (?, ?, ?, ?, ?, 0)", t.token, t.TokenText, student.Id, time.Now(), suffixip)
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return
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}
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func (student *Student) GetTunnelTokens() (ts []*TunnelToken, err error) {
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if rows, errr := DBQuery("SELECT token, token_text, id_student, pubkey, time, suffixip, version FROM student_tunnel_tokens WHERE id_student = ? ORDER BY time DESC", student.Id); errr != nil {
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return nil, errr
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} else if wgd, errr := readWgDump(); errr != nil {
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return nil, errr
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} else {
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defer rows.Close()
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for rows.Next() {
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t := &TunnelToken{}
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if err = rows.Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time, &t.SuffixIP, &t.Version); err != nil {
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return
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}
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if t.PubKey != nil {
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if v, ok := wgd[base64.StdEncoding.EncodeToString(t.PubKey)]; ok {
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t.Dump = v
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}
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}
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ts = append(ts, t)
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}
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if err = rows.Err(); err != nil {
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return
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}
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return
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}
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}
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func (student *Student) GetActivesTunnels() (ts []*TunnelToken, err error) {
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if rows, errr := DBQuery("SELECT token, token_text, id_student, pubkey, time, suffixip, version FROM student_tunnel_tokens WHERE id_student = ? ORDER BY time DESC", student.Id); errr != nil {
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return nil, errr
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} else if wgd, errr := readWgDump(); errr != nil {
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return nil, errr
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} else {
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defer rows.Close()
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for rows.Next() {
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t := &TunnelToken{}
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if err = rows.Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time, &t.SuffixIP, &t.Version); err != nil {
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return
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}
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if t.PubKey != nil {
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if v, ok := wgd[base64.StdEncoding.EncodeToString(t.PubKey)]; ok {
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t.Dump = v
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ts = append(ts, t)
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}
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}
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}
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if err = rows.Err(); err != nil {
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return
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}
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return
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}
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}
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func (student *Student) GetActivesTunnelsPubKey() (ts []ed25519.PublicKey, err error) {
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var activeTuns []*TunnelToken
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activeTuns, err = student.GetActivesTunnels()
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if err != nil {
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return
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}
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for _, tun := range activeTuns {
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if tun.Dump != nil {
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pk := ed25519.NewKeyFromSeed(tun.token[:ed25519.SeedSize])
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ts = append(ts, pk.Public().(ed25519.PublicKey))
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}
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}
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return
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}
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func (student *Student) GetTunnelToken(token []byte) (t *TunnelToken, err error) {
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t = new(TunnelToken)
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err = DBQueryRow("SELECT token, token_text, id_student, pubkey, time, suffixip, version FROM student_tunnel_tokens WHERE token = ? AND id_student = ? ORDER BY time DESC", token, student.Id).Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time, &t.SuffixIP, &t.Version)
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if err == nil && t.PubKey != nil {
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if wgd, errr := readWgDump(); errr == nil {
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if v, ok := wgd[base64.StdEncoding.EncodeToString(t.PubKey)]; ok {
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t.Dump = v
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}
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}
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}
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return
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}
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func (t *TunnelToken) Update() (int64, error) {
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newtoken := TokenFromText(t.TokenText)
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tm := time.Now()
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if res, err := DBExec("UPDATE student_tunnel_tokens SET token = ?, token_text = ?, id_student = ?, pubkey = ?, time = ?, suffixip = ?, version = ? WHERE token = ?", newtoken, t.TokenText, t.IdStudent, t.PubKey, tm, t.SuffixIP, t.Version, t.token); err != nil {
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return 0, err
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} else if nb, err := res.RowsAffected(); err != nil {
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return 0, err
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} else {
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t.token = newtoken
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t.Time = tm
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return nb, err
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}
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}
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func (t *TunnelToken) Delete() (int64, error) {
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if res, err := DBExec("DELETE FROM student_tunnel_tokens WHERE token = ? AND id_student = ?", t.token, t.IdStudent); err != nil {
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return 0, err
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} else if nb, err := res.RowsAffected(); err != nil {
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return 0, err
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} else {
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return nb, err
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}
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}
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func GetStudentsTunnels() (ts []*TunnelToken, err error) {
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if rows, errr := DBQuery("SELECT T.token, T.token_text, T.id_student, T.pubkey, T.time, T.suffixip, T.version FROM student_tunnel_tokens T INNER JOIN (SELECT B.id_student, MAX(B.time) AS time FROM student_tunnel_tokens B WHERE B.pubkey IS NOT NULL GROUP BY id_student) L ON T.id_student = L.id_student AND T.time = L.time"); errr != nil {
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return nil, errr
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} else {
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defer rows.Close()
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for rows.Next() {
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t := &TunnelToken{}
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if err = rows.Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time, &t.SuffixIP, &t.Version); err != nil {
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return
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}
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ts = append(ts, t)
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}
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err = rows.Err()
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return
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}
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}
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