token-validator: wg tunnel API interface
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parent
38902bee8d
commit
ab40917285
4 changed files with 241 additions and 14 deletions
207
token-validator/wg.go
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207
token-validator/wg.go
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package main
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import (
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"crypto/rand"
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"crypto/sha512"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"time"
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"github.com/julienschmidt/httprouter"
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)
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func init() {
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router.GET("/api/wg.conf", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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w.Header().Set("Content-Type", "text/plain")
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err := GenWGConfig(w)
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if err != nil {
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w.Write([]byte(err.Error()))
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}
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})
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router.GET("/api/wg/", apiAuthHandler(showWgTunnel))
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router.GET("/api/wginfo", apiAuthHandler(func (student Student, ps httprouter.Params, body []byte) (interface{}, error) {
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return getTunnelInfo(student), nil
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}))
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router.POST("/api/wg/", apiAuthHandler(genWgToken))
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router.GET("/api/wg/:token", apiAuthHandler(getWgTunnelInfo))
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}
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func showWgTunnel(student Student, ps httprouter.Params, body []byte) (interface{}, error) {
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// Get tunnels assigned to the student
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return student.GetTunnelTokens()
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}
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func genWgToken(student Student, ps httprouter.Params, body []byte) (interface{}, error) {
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// Generate a token to access related wg info
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return student.NewTunnelToken()
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}
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type TunnelInfo struct {
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Status string `json:"status"`
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SrvPubKey []byte `json:"srv_pubkey"`
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SrvPort uint16 `json:"srv_port"`
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CltIPv6 string `json:"clt_ipv6"`
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CltRange uint8 `json:"clt_range"`
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SrvGW6 string `json:"srv_gw6"`
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}
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func getTunnelInfo(student Student) TunnelInfo {
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return TunnelInfo{
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Status: "OK",
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SrvPubKey: []byte{'T', 'B', 'D'},
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SrvPort: 42912,
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CltIPv6: studentIP(student.Id),
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CltRange: 80,
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SrvGW6: "2a01:e0a:2b:2252::1",
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}
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}
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type PubTunnel struct {
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PubKey []byte
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}
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func getWgTunnelInfo(student Student, ps httprouter.Params, body []byte) (interface{}, error) {
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// Access wg infos
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tokenhex := []byte(ps.ByName("token"))
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tokendec := make([]byte, hex.DecodedLen(len(tokenhex)))
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n, err := hex.Decode(tokendec, tokenhex)
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if err != nil {
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return nil, err
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}
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token, err := student.GetTunnelToken(tokendec[:n])
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if err != nil {
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return nil, err
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}
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var pt PubTunnel
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if err := json.Unmarshal(body, &pt); err != nil {
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return nil, err
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}
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token.PubKey = pt.PubKey
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_, err = token.Update()
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if err != nil {
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return nil, err
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}
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return getTunnelInfo(student), 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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}
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func getTunnelToken(token []byte) (t TunnelToken, err error) {
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err = DBQueryRow("SELECT token, token_text, id_student, pubkey, time FROM student_tunnel_tokens WHERE token=? ORDER BY time DESC", token).Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time)
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return
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}
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func tokenFromText(token string) []byte {
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sha := sha512.Sum512_256([]byte(token))
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return sha[:]
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}
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func (student Student) NewTunnelToken() (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.TokenText = base64.RawStdEncoding.EncodeToString(tok)
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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) VALUES (?, ?, ?, ?)", t.token, t.TokenText, student.Id, time.Now())
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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 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 {
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defer rows.Close()
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for rows.Next() {
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var t TunnelToken
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if err = rows.Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time); 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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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) GetTunnelToken(token []byte) (t TunnelToken, err error) {
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err = DBQueryRow("SELECT token, token_text, id_student, pubkey, time 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)
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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 = ? WHERE token = ?", newtoken, t.TokenText, t.IdStudent, t.PubKey, tm, 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 GetStudentsTunnels() (ts []TunnelToken, err error) {
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if rows, errr := DBQuery("SELECT token, token_text, id_student, pubkey, time FROM student_tunnel_tokens T INNER JOIN (SELECT B.token, B.id_student, MAX(B.time) FROM student_tunnel_tokens B GROUP BY id_student) L ON T.token = L.token"); 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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var t TunnelToken
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if err = rows.Scan(&t.token, &t.TokenText, &t.IdStudent, &t.PubKey, &t.Time); 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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func studentIP(idstd int64) string {
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return fmt.Sprintf("2a01:e0a:2b:2252:%x::", idstd)
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}
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func GenWGConfig(w io.Writer) (error) {
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ts, err := GetStudentsTunnels()
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if err != nil {
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return err
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}
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for _, t := range ts {
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w.Write([]byte(fmt.Sprintf(`[Peer]
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PublicKey = %s
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AllowedIPs = %s/%d`, base64.StdEncoding.EncodeToString(t.PubKey), studentIP(t.IdStudent), 80)))
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}
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return nil
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}
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