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Flag Handler Service #36
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MayankMittal1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -9,4 +9,4 @@ tmp/* | |
| katana | ||
| test.go | ||
| vendor/* | ||
| *.log | ||
| *.log | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
| "fmt" | ||
| "golang.org/x/crypto/ssh" | ||
| "strings" | ||
| ) | ||
|
|
||
| func CheckPrivateKey(privateKey, publicKey string) bool { | ||
| //check key | ||
| pub, _, _, _, err := ssh.ParseAuthorizedKey([]byte(publicKey)) | ||
| if err != nil { | ||
| fmt.Println("error in parsing public key") | ||
| return false | ||
| } | ||
|
|
||
| private, err := ssh.ParsePrivateKey([]byte(privateKey)) | ||
| if err != nil { | ||
| fmt.Println("error in parsing private key") | ||
| return false | ||
| } | ||
|
|
||
| return bytes.Equal(private.PublicKey().Marshal(), pub.Marshal()) | ||
| } | ||
|
|
||
| func GenerateSSHKeyPair() (string, string, error) { | ||
| privateKey, err := rsa.GenerateKey(rand.Reader, 1024) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
|
|
||
| // generate and write private key as PEM | ||
| var privKeyBuf strings.Builder | ||
|
|
||
| privateKeyPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)} | ||
| if err := pem.Encode(&privKeyBuf, privateKeyPEM); err != nil { | ||
| return "", "", err | ||
| } | ||
|
|
||
| // generate and write public key | ||
| pub, err := ssh.NewPublicKey(&privateKey.PublicKey) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
|
|
||
| var pubKeyBuf strings.Builder | ||
| pubKeyBuf.Write(ssh.MarshalAuthorizedKey(pub)) | ||
|
|
||
| return pubKeyBuf.String(), privKeyBuf.String(), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,48 @@ | ||
| package flaghandlerservice | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/sdslabs/katana/lib/mongo" | ||
| "github.com/sdslabs/katana/types" | ||
| "go.mongodb.org/mongo-driver/bson" | ||
| "go.mongodb.org/mongo-driver/mongo/options" | ||
| ) | ||
|
|
||
| func checkSubmission(submission *types.Submission) bool { | ||
| _, err := mongo.FetchSubmission(submission.SubmittedBy, submission.Flag) | ||
| return err != nil | ||
| } | ||
|
|
||
| func submitFlag(value string, team types.CTFTeam) (bool, int) { | ||
| flag, err := mongo.FetchFlag(value) | ||
| var points int | ||
| if err != nil { | ||
| return false, 0 | ||
| } | ||
| if flag.TeamID == team.Index { | ||
| return false, 0 | ||
| } | ||
| submission := &types.Submission{} | ||
| submission.ChallengeID = flag.ChallengeID | ||
| submission.Flag = flag.Value | ||
| submission.SubmittedBy = team.Index | ||
| submission.Time = time.Now() | ||
| if !checkSubmission(submission) { | ||
| return false, 0 | ||
| } | ||
| if res, err := mongo.FetchChallenge(flag.ChallengeID); err != nil { | ||
| return false, 0 | ||
| } else { | ||
| team.Score = team.Score + res.Points | ||
| points = res.Points | ||
| } | ||
| if err := mongo.UpdateOne(context.Background(), mongo.TeamsCollection, bson.M{"id": team.Index}, team, options.FindOneAndUpdate().SetUpsert(false)); err != nil { | ||
| return false, 0 | ||
| } | ||
| if _, err := mongo.InsertOne(context.Background(), mongo.SubmissionsCollection, submission); err != nil { | ||
| return false, 0 | ||
| } | ||
| return true, points | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package flaghandlerservice | ||
|
|
||
| import ( | ||
| "context" | ||
| "log" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/jasonlvhit/gocron" | ||
| "github.com/sdslabs/katana/configs" | ||
| "github.com/sdslabs/katana/lib/mongo" | ||
| "github.com/sdslabs/katana/types" | ||
| "go.mongodb.org/mongo-driver/bson" | ||
| ) | ||
|
|
||
| func Ticker(wg sync.WaitGroup) { | ||
| log.Println("Ticker") | ||
| defer wg.Done() | ||
| handler() | ||
| gocron.Every(uint64(configs.FlagConfig.TickPeriod)).Second().Do(handler) | ||
| <-gocron.Start() | ||
| // gocron.Every(uint64(configs.FlagConfig.TickPeriod)).Second().Do(flaggetter) todo:trigger setter here | ||
| // <-gocron.Start() | ||
| } | ||
|
|
||
| func handler() { | ||
| log.Print("Handler triggered -> ", time.Now()) | ||
| challenges := mongo.FetchChallenges(context.Background(), mongo.ChallengesCollection, bson.M{}) | ||
| teams := mongo.FetchTeams(context.Background(), mongo.TeamsCollection, bson.M{}) | ||
| time := time.Now() | ||
| for _, team := range teams { | ||
| for _, challenge := range challenges { | ||
| go flagUpdater(challenge, team, time) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func flagUpdater(challenge types.Challenge, team types.CTFTeam, triggerTime time.Time) { | ||
| flagValue := random(configs.FlagConfig.FlagLength) | ||
| var flag = &types.Flag{} | ||
| flag.Value = flagValue | ||
| flag.ChallengeID = challenge.ID | ||
| flag.CreatedAt = triggerTime | ||
| flag.TeamID = team.Index | ||
| if _, err := mongo.InsertOne(context.Background(), mongo.FlagsCollection, flag); err != nil { | ||
| log.Println(err) | ||
| } else { | ||
| log.Println("Trigger setter") | ||
| //todo : trigger flag setter here | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| package flaghandlerservice | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "encoding/binary" | ||
| ) | ||
|
|
||
| func Bytes(n int) []byte { | ||
| b := make([]byte, n) | ||
| _, err := rand.Read(b) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return b | ||
| } | ||
|
|
||
| var defLetters = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ") | ||
|
|
||
| func random(n int, letters ...string) string { | ||
| var letterRunes []rune | ||
| if len(letters) == 0 { | ||
| letterRunes = defLetters | ||
| } else { | ||
| letterRunes = []rune(letters[0]) | ||
| } | ||
|
|
||
| var bb bytes.Buffer | ||
| bb.Grow(n) | ||
| l := uint32(len(letterRunes)) | ||
| // on each loop, generate one random rune and append to output | ||
| for i := 0; i < n; i++ { | ||
| bb.WriteRune(letterRunes[binary.BigEndian.Uint32(Bytes(4))%l]) | ||
| } | ||
| return bb.String() | ||
| } |
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I am not sure if this will be an issue. Use upsert here. Will do a discussion on this.