token-validator: done many challenges
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parent
91edced44d
commit
133244897b
253
token-validator/challenge.go
Normal file
253
token-validator/challenge.go
Normal file
@ -0,0 +1,253 @@
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package main
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import (
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"crypto/hmac"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/julienschmidt/httprouter"
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"golang.org/x/crypto/blake2b"
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)
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const IPgwDMZ = "172.23.200.1"
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type Challenge struct {
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Accessible []func(*Student, *http.Request) error
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Check func(*Student, *givenToken, int) error
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}
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/* Restrictions */
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func noAccessRestriction(*Student, *http.Request) error {
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return nil
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}
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func accessFrom(ip string) func(_ *Student, r *http.Request) error {
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return func(_ *Student, r *http.Request) error {
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if r.Header.Get("X-Forwarded-By") != ip {
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return errors.New("This challenge is not accessible this way.")
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}
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return nil
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}
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}
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func notAccessFrom(ip string) func(_ *Student, r *http.Request) error {
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return func(_ *Student, r *http.Request) error {
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if r.Header.Get("X-Forwarded-By") == ip {
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return errors.New("This challenge is not accessible this way.")
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}
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return nil
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}
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}
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func maxProxy(nb int) func(_ *Student, r *http.Request) error {
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return func(_ *Student, r *http.Request) error {
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if len(strings.Split(r.Header.Get("X-Forwarded-For"), ",")) > nb {
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return errors.New("This challenge is not accessible this way.")
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}
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return nil
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}
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}
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func sslOnly(_ *Student, r *http.Request) error {
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if r.Header.Get("X-Forwarded-Proto") != "https" {
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return errors.New("This challenge should be performed over TLS.")
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}
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return nil
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}
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/* Challenges */
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func challenge42(s *Student, t *givenToken, chid int) error {
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pkey := s.GetPKey()
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if expectedToken, err := GenerateToken(pkey, chid, []byte("42")); err != nil {
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return err
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} else if ! hmac.Equal(expectedToken, t.token) {
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return errors.New("This is not the expected token.")
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} else {
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return nil
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}
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}
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func challengeDNS(s *Student, t *givenToken, chid int) error {
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pkey := s.GetPKey()
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if expectedToken, err := GenerateToken(pkey, chid, []byte("8dde678132d6c558fc6adaeb9f1d53bf6ec7b876308cf98c48604caa9138523c1ce58b672c87c7e7d9b7248b81804d3940dbf20bf263eeb683244f7c1143712d")); err != nil {
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return err
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} else if ! hmac.Equal(expectedToken, t.token) {
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return errors.New("This is not the expected token.")
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} else {
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return nil
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}
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}
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func challengeTime(s *Student, t *givenToken, chid int) error {
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pkey := s.GetPKey()
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if expectedToken, err := GenerateToken(pkey, chid, []byte(t.Data[0])); err != nil {
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return err
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} else if ! hmac.Equal(expectedToken, t.token) {
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return errors.New("This is not the expected token.")
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} else if t, err := strconv.ParseInt(t.Data[0], 10, 64); err != nil {
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return err
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} else {
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var rt time.Time
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if t > 3000000000 {
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rt = time.Unix(t / 1000000000, t % 1000000000)
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} else {
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rt = time.Unix(t, 0)
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}
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if rt.After(time.Now()) {
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return errors.New("You seem to live in the future...")
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} else if d := rt.Sub(time.Now()); d.Minutes() < -10 {
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return errors.New(fmt.Sprintf("Your time is %.0f minutes from us", d.Minutes()))
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}
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return nil
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}
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}
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func challengeDisk(s *Student, t *givenToken, chid int) error {
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pkey := s.GetPKey()
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n1, err := strconv.Atoi(t.Token[0:2])
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if err != nil {
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return err
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}
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n2, err := strconv.Atoi(t.Token[2:4])
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if err != nil {
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return err
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}
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sum := make([]byte, hex.DecodedLen(len(t.Token[4:])))
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if _, err := hex.Decode(t.token, []byte(t.Token[4:])); err != nil {
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return err
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}
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expectedToken := blake2b.Sum512([]byte(pkey[n1:n2]))
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if ! hmac.Equal(expectedToken[:], sum) {
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return errors.New("This is not the expected token.")
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} else {
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return nil
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}
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}
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var challenges []Challenge
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func init() {
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challenges = []Challenge{
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/* Challenge 1 : 42 */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{noAccessRestriction},
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Check: challenge42,
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},
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/* Challenge 2 : 42 from DMZ */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{accessFrom(IPgwDMZ)},
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Check: challenge42,
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},
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/* Challenge 3 : ssl (+ ntp) */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{accessFrom(IPgwDMZ), sslOnly},
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Check: challengeTime,
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},
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/* Challenge 4 : disk */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{noAccessRestriction},
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Check: challengeDisk,
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},
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/* Challenge 5 : DNS TXT */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{accessFrom(IPgwDMZ), sslOnly},
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Check: challengeDNS,
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},
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/* Challenge 6 : time net */
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Challenge{
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Accessible: []func(*Student, *http.Request) error{maxProxy(1)},
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Check: challengeTime,
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},
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}
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router.GET("/challenge", apiHandler(getChallengeList))
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router.GET("/challenge/:chid", rawHandler(accessibleChallenge))
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router.POST("/challenge", rawHandler(receiveToken))
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}
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type givenToken struct {
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Login string `json:"login"`
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Challenge int `json:"challenge"`
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Token string `json:"token"`
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token []byte
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Data []string `json:"data"`
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}
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func getChallengeList(_ httprouter.Params, _ []byte) (interface{}, error) {
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var ret []int
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for i := range challenges {
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ret = append(ret, i)
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}
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return ret, nil
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}
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func accessibleChallenge(r *http.Request, ps httprouter.Params, _ []byte) (interface{}, error) {
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if chid, err := strconv.Atoi(string(ps.ByName("chid"))); err != nil {
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return nil, err
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} else if chid == 0 || chid >= len(challenges) {
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return nil, errors.New("This challenge doesn't exist")
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} else {
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for _, a := range challenges[chid - 1].Accessible {
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if err := a(nil, r); err != nil {
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return nil, err
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}
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}
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return true, nil
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}
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}
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func receiveToken(r *http.Request, ps httprouter.Params, body []byte) (interface{}, error) {
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if _, err := accessibleChallenge(r, ps, body); err != nil {
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return nil, err
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}
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var gt givenToken
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if err := json.Unmarshal(body, >); err != nil {
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return nil, err
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}
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gt.token = make([]byte, hex.DecodedLen(len(gt.Token)))
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if _, err := hex.Decode(gt.token, []byte(gt.Token)); err != nil {
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return nil, err
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}
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if chid, err := strconv.Atoi(string(ps.ByName("chid"))); err != nil {
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return nil, err
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} else if chid == 0 || chid > len(challenges) {
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return nil, errors.New("This challenge doesn't exist")
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} else if std, err := getStudentByLogin(gt.Login); err != nil {
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return nil, err
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} else {
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if err := challenges[chid - 1].Check(&std, >, chid); err != nil {
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log.Printf("%s just try ch#%d: %s\n", std.Login, chid, err)
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return nil, err
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}
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if _, err := std.UnlockNewChallenge(chid, gt.Token); err != nil {
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log.Println(err)
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return nil, err
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}
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log.Printf("%s just unlock ch#%d\n", std.Login, chid)
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return "Success", nil
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}
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}
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@ -38,7 +38,7 @@ func remoteValidatorHandler(f func(http.ResponseWriter, *http.Request, httproute
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}
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}
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func apiHandler(f DispatchFunction) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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func rawHandler(f func(*http.Request, httprouter.Params, []byte) (interface{}, error)) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
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r.RemoteAddr = addr
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@ -69,7 +69,7 @@ func apiHandler(f DispatchFunction) func(http.ResponseWriter, *http.Request, htt
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}
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}
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ret, err = f(ps, body)
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ret, err = f(r, ps, body)
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// Format response
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resStatus := http.StatusOK
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@ -99,6 +99,10 @@ func apiHandler(f DispatchFunction) func(http.ResponseWriter, *http.Request, htt
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}
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}
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func apiHandler(f DispatchFunction) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return rawHandler(func (_ *http.Request, ps httprouter.Params, b []byte) (interface{}, error) { return f(ps, b) })
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}
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func studentHandler(f func(Student, []byte) (interface{}, error)) func(httprouter.Params, []byte) (interface{}, error) {
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return func(ps httprouter.Params, body []byte) (interface{}, error) {
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if sid, err := strconv.Atoi(string(ps.ByName("sid"))); err != nil {
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@ -1,6 +1,8 @@
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package main
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import (
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"crypto/hmac"
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"crypto/sha512"
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"encoding/json"
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"strings"
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"time"
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@ -10,19 +12,21 @@ import (
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func init() {
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router.GET("/api/students/", apiHandler(
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func(httprouter.Params,[]byte) (interface{}, error) {
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return getStudents() }))
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func(httprouter.Params, []byte) (interface{}, error) {
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return getStudents()
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}))
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router.POST("/api/students/", remoteValidatorHandler(apiHandler(createStudent)))
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router.GET("/api/students/:sid/", apiHandler(studentHandler(
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func(std Student, _ []byte) (interface{}, error) {
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return std, nil })))
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return std, nil
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})))
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router.PUT("/api/students/:sid/", remoteValidatorHandler(apiHandler(studentHandler(updateStudent))))
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router.DELETE("/api/students/:sid/", remoteValidatorHandler(apiHandler(studentHandler(
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func(std Student, _ []byte) (interface{}, error) {
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return std.Delete() }))))
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return std.Delete()
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}))))
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}
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type Student struct {
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Id int64 `json:"id"`
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Login string `json:"login"`
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@ -70,6 +74,10 @@ func NewStudent(login string) (Student, error) {
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}
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}
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func (s Student) GetPKey() []byte {
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return hmac.New(sha512.New512_224, []byte(sharedSecret)).Sum([]byte(s.Login))
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}
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func (s Student) Update() (int64, error) {
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if res, err := DBExec("UPDATE students SET login = ?, time = ? WHERE id_student = ?", s.Login, s.Time, s.Id); err != nil {
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return 0, err
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@ -100,7 +108,6 @@ func ClearStudents() (int64, error) {
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}
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}
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func createStudent(_ httprouter.Params, body []byte) (interface{}, error) {
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var std Student
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if err := json.Unmarshal(body, &std); err != nil {
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@ -120,3 +127,20 @@ func updateStudent(current Student, body []byte) (interface{}, error) {
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current.Time = new.Time
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return current.Update()
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}
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type UnlockedChallenge struct {
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Id int64 `json:"id"`
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IdStudent int64 `json:"id_student"`
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Challenge int `json:"challenge"`
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Time time.Time `json:"time"`
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}
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func (s Student) UnlockNewChallenge(challenge int, value string) (UnlockedChallenge, error) {
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if res, err := DBExec("INSERT INTO student_challenges (id_student, challenge, time, value) VALUES (?, ?, ?, ?)", s.Id, challenge, time.Now(), value); err != nil {
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return UnlockedChallenge{}, err
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} else if utid, err := res.LastInsertId(); err != nil {
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return UnlockedChallenge{}, err
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} else {
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return UnlockedChallenge{utid, s.Id, challenge, time.Now()}, err
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}
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}
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24
token-validator/token.go
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24
token-validator/token.go
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@ -0,0 +1,24 @@
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package main
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import (
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"fmt"
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"golang.org/x/crypto/blake2b"
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)
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func GenerateToken(pkey []byte, id int, a... []byte) ([]byte, error) {
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h, err := blake2b.New(blake2b.Size, nil)
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if err != nil {
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return nil, err
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}
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h.Write(pkey)
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h.Write([]byte(fmt.Sprintf(":%d", id)))
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for _, v := range a {
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h.Write([]byte(":"))
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h.Write(v)
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}
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return h.Sum(nil), nil
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}
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