go.mod

@@ -2,9 +2,13 @@ module git.gnous.eu/gnouseu/plakken
 
 go 1.22
 
-require github.com/redis/go-redis/v9 v9.5.1
+require (
+	github.com/redis/go-redis/v9 v9.5.1
+	golang.org/x/crypto v0.20.0
+)
 
 require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	golang.org/x/sys v0.17.0 // indirect
 )

go.sum

@@ -8,3 +8,7 @@ github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/r
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/redis/go-redis/v9 v9.5.1 h1:H1X4D3yHPaYrkL5X06Wh6xNVM/pX0Ft4RV0vMGvLBh8=
 github.com/redis/go-redis/v9 v9.5.1/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=
+golang.org/x/crypto v0.20.0 h1:jmAMJJZXr5KiCw05dfYK9QnqaqKLYXijU23lsEdcQqg=
+golang.org/x/crypto v0.20.0/go.mod h1:Xwo95rrVNIoSMx9wa1JroENMToLWn3RNVrTBpLHgZPQ=
+golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

internal/constant/constants.go

@@ -5,4 +5,10 @@ import "time"
 const (
 	HTTPTimeout          = 3 * time.Second
 	ExpirationCurlCreate = 604800 * time.Second // Second in one week
+	TokenLength          = 32
+	ArgonSaltSize        = 16
+	ArgonMemory          = 64 * 1024
+	ArgonThreads         = 4
+	ArgonKeyLength       = 32
+	ArgonIterations      = 2
 )

internal/database/db.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"time"
 
+	"git.gnous.eu/gnouseu/plakken/internal/secret"
 	"github.com/redis/go-redis/v9"
 )
 
@@ -36,7 +37,7 @@ func ConnectDB(dbConfig *redis.Options) *redis.Client {
 func Ping(db *redis.Client) error {
 	status := db.Ping(ctx)
 	if status.String() != "ping: PONG" {
-		return &PingError{}
+		return &pingError{}
 	}
 	return nil
 }
@@ -68,6 +69,13 @@ func (config DBConfig) UrlExist(url string) bool {
 	return config.DB.Exists(ctx, url).Val() == 1
 }
 
-func (config DBConfig) VerifySecret(url string, secret string) bool {
-	return secret == config.DB.HGet(ctx, url, "secret").Val()
+func (config DBConfig) VerifySecret(url string, token string) (bool, error) {
+	storedHash := config.DB.HGet(ctx, url, "secret").Val()
+
+	result, err := secret.VerifyPassword(token, storedHash)
+	if err != nil {
+		return false, err
+	}
+
+	return result, nil
 }

internal/database/error.go

@@ -1,7 +1,7 @@
 package database
 
-type PingError struct{}
+type pingError struct{}
 
-func (m *PingError) Error() string {
+func (m *pingError) Error() string {
 	return "Connection to redis not work"
 }

internal/httpServer/server.go

@@ -42,8 +42,8 @@ func (config ServerConfig) router() {
 	http.Handle("GET /static/{file}", http.FileServer(staticFiles))
 	http.HandleFunc("GET /{key}/{settings...}", WebConfig.View)
 	http.HandleFunc("POST /{$}", WebConfig.CurlCreate)
-	http.HandleFunc("POST /create/{$}", WebConfig.Create)
-	http.HandleFunc("DELETE /{key}", WebConfig.Delete)
+	http.HandleFunc("POST /create/{$}", WebConfig.PostCreate)
+	http.HandleFunc("DELETE /{key}", WebConfig.DeleteRequest)
 }
 
 // Config Configure HTTP server

internal/secret/crypto.go

@@ -0,0 +1,147 @@
+// Package secret implement all crypto utils like password hashing and secret generation
+package secret
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"git.gnous.eu/gnouseu/plakken/internal/constant"
+	"golang.org/x/crypto/argon2"
+)
+
+type argon2idHash struct {
+	salt []byte
+	hash []byte
+}
+
+// Argon2id config
+type config struct {
+	saltLength uint8
+	memory     uint32
+	threads    uint8
+	keyLength  uint32
+	iterations uint32
+}
+
+// generateSecret for password hashing or token generation
+func generateSecret(length uint8) ([]byte, error) {
+	secret := make([]byte, length)
+
+	_, err := rand.Read(secret)
+	if err != nil {
+		return nil, err
+	}
+
+	return secret, err
+}
+
+// GenerateToken generate hexadecimal token
+func GenerateToken() (string, error) {
+	secret, err := generateSecret(constant.TokenLength)
+	if err != nil {
+		return "", err
+	}
+
+	token := fmt.Sprintf("%x", secret)
+
+	return token, nil
+}
+
+// generateArgon2ID Generate an argon2id hash from source string and specified salt
+func (config config) generateArgon2ID(source string, salt []byte) []byte {
+	hash := argon2.IDKey([]byte(source), salt, config.iterations, config.memory, config.threads, config.keyLength)
+
+	return hash
+}
+
+// Password hash a source string with argon2id, return properly encoded hash
+func Password(password string) (string, error) {
+	config := config{
+		saltLength: constant.ArgonSaltSize,
+		memory:     constant.ArgonMemory,
+		threads:    constant.ArgonThreads,
+		keyLength:  constant.ArgonKeyLength,
+		iterations: constant.ArgonIterations,
+	}
+
+	salt, err := generateSecret(config.saltLength)
+	if err != nil {
+		return "", err
+	}
+
+	hash := config.generateArgon2ID(password, salt)
+
+	base64Hash := base64.RawStdEncoding.EncodeToString(hash)
+	base64Salt := base64.RawStdEncoding.EncodeToString(salt)
+
+	formatted := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s", argon2.Version, config.memory, config.iterations, config.threads, base64Salt, base64Hash)
+
+	return formatted, nil
+}
+
+// VerifyPassword check is source password and stored password is similar, take password and a properly encoded hash.
+func VerifyPassword(password string, hash string) (bool, error) {
+	argon2Hash, config, err := parseHash(hash)
+	if err != nil {
+		return false, err
+	}
+
+	result := config.generateArgon2ID(password, argon2Hash.salt)
+
+	return bytes.Equal(result, argon2Hash.hash), nil
+}
+
+// parseHash parse existing encoded argon2id string
+func parseHash(source string) (argon2idHash, config, error) {
+	separateItem := strings.Split(source, "$")
+	if len(separateItem) != 6 {
+		return argon2idHash{}, config{}, &parseError{message: "Hash format is not valid"}
+	}
+
+	if separateItem[1] != "argon2id" {
+		return argon2idHash{}, config{}, &parseError{message: "Algorithm is not valid"}
+	}
+
+	separateParam := strings.Split(separateItem[3], ",")
+	if len(separateParam) != 3 {
+		return argon2idHash{}, config{}, &parseError{message: "Hash config is not valid"}
+	}
+
+	salt, err := base64.RawStdEncoding.Strict().DecodeString(separateItem[4])
+	if err != nil {
+		return argon2idHash{}, config{}, err
+	}
+
+	var hash []byte
+	hash, err = base64.RawStdEncoding.Strict().DecodeString(separateItem[5])
+	if err != nil {
+		return argon2idHash{}, config{}, err
+	}
+
+	saltLength := uint8(len(salt))
+	keyLength := uint32(len(hash))
+
+	var memory int
+	memory, err = strconv.Atoi(strings.Replace(separateParam[0], "m=", "", -1))
+	if err != nil {
+		return argon2idHash{}, config{}, err
+	}
+
+	var iterations int
+	iterations, err = strconv.Atoi(strings.Replace(separateParam[1], "t=", "", -1))
+	if err != nil {
+		return argon2idHash{}, config{}, err
+	}
+
+	var threads int
+	threads, err = strconv.Atoi(strings.Replace(separateParam[2], "p=", "", -1))
+	if err != nil {
+		return argon2idHash{}, config{}, err
+	}
+
+	return argon2idHash{salt: salt, hash: hash}, config{saltLength: saltLength, memory: uint32(memory), threads: uint8(threads), iterations: uint32(iterations), keyLength: keyLength}, nil
+}

internal/secret/error.go

@@ -0,0 +1,9 @@
+package secret
+
+type parseError struct {
+	message string
+}
+
+func (m *parseError) Error() string {
+	return "parseHash: " + m.message
+}

internal/utils/error.go

@@ -1,17 +1,17 @@
 package utils
 
-type ParseIntBeforeSeparatorError struct {
-	Message string
+type parseIntBeforeSeparatorError struct {
+	message string
 }
 
-func (m *ParseIntBeforeSeparatorError) Error() string {
-	return "parseIntBeforeSeparator: " + m.Message
+func (m *parseIntBeforeSeparatorError) Error() string {
+	return "parseIntBeforeSeparator: " + m.message
 }
 
 type ParseExpirationError struct {
-	Message string
+	message string
 }
 
 func (m *ParseExpirationError) Error() string {
-	return "parseIntBeforeSeparator: " + m.Message
+	return "parseIntBeforeSeparator: " + m.message
 }

internal/utils/utils.go

@@ -1,8 +1,6 @@
 package utils
 
 import (
-	"crypto/rand"
-	"encoding/hex"
 	"log"
 	mathrand "math/rand/v2"
 	"regexp"
@@ -21,17 +19,6 @@ func GenerateUrl(length uint8) string {
 	return string(b)
 }
 
-// GenerateSecret generate random secret (32 bytes hexadecimal)
-func GenerateSecret() string {
-	key := make([]byte, 32)
-	_, err := rand.Read(key)
-	if err != nil {
-		log.Printf("Failed to generate secret")
-	}
-
-	return hex.EncodeToString(key)
-}
-
 // CheckCharRedundant  verify is a character is redundant in a string
 func CheckCharRedundant(source string, char string) bool { // Verify if a char is redundant
 	return strings.Count(source, char) > 1
@@ -39,7 +26,7 @@ func CheckCharRedundant(source string, char string) bool { // Verify if a char i
 
 func parseIntBeforeSeparator(source *string, sep string) (int, error) { // return 0 & error if error, only accept positive number
 	if CheckCharRedundant(*source, sep) {
-		return 0, &ParseIntBeforeSeparatorError{Message: *source + ": cannot parse value as int"}
+		return 0, &parseIntBeforeSeparatorError{message: *source + ": cannot parse value as int"}
 	}
 	var value int
 	var err error
@@ -47,14 +34,14 @@ func parseIntBeforeSeparator(source *string, sep string) (int, error) { // retur
 		value, err = strconv.Atoi(strings.Split(*source, sep)[0])
 		if err != nil {
 			log.Println(err)
-			return 0, &ParseIntBeforeSeparatorError{Message: *source + ": cannot parse value as int"}
+			return 0, &parseIntBeforeSeparatorError{message: *source + ": cannot parse value as int"}
 		}
 		if value < 0 { // Only positive value is correct
-			return 0, &ParseIntBeforeSeparatorError{Message: *source + ": format only take positive value"}
+			return 0, &parseIntBeforeSeparatorError{message: *source + ": format only take positive value"}
 		}
 
 		if value > 99 {
-			return 0, &ParseIntBeforeSeparatorError{Message: *source + ": Format only take two number"}
+			return 0, &parseIntBeforeSeparatorError{message: *source + ": Format only take two number"}
 		}
 
 		*source = strings.Join(strings.Split(*source, sep)[1:], "")
@@ -77,25 +64,25 @@ func ParseExpiration(source string) (int, error) {
 	expiration = tempOutput * 86400
 	if err != nil {
 		log.Println(err)
-		return 0, &ParseExpirationError{Message: "Invalid syntax"}
+		return 0, &ParseExpirationError{message: "Invalid syntax"}
 	}
 	tempOutput, err = parseIntBeforeSeparator(&source, "h")
 	expiration += tempOutput * 3600
 	if err != nil {
 		log.Println(err)
-		return 0, &ParseExpirationError{Message: "Invalid syntax"}
+		return 0, &ParseExpirationError{message: "Invalid syntax"}
 	}
 	tempOutput, err = parseIntBeforeSeparator(&source, "m")
 	expiration += tempOutput * 60
 	if err != nil {
 		log.Println(err)
-		return 0, &ParseExpirationError{Message: "Invalid syntax"}
+		return 0, &ParseExpirationError{message: "Invalid syntax"}
 	}
 	tempOutput, err = parseIntBeforeSeparator(&source, "s")
 	expiration += tempOutput * 1
 	if err != nil {
 		log.Println(err)
-		return 0, &ParseExpirationError{Message: "Invalid syntax"}
+		return 0, &ParseExpirationError{message: "Invalid syntax"}
 	}
 
 	return expiration, nil

internal/web/plak/error.go

@@ -1,10 +1,18 @@
 package plak
 
-type DeletePlakError struct {
-	Name string
-	Err  error
+type deletePlakError struct {
+	name string
+	err  error
 }
 
-func (m *DeletePlakError) Error() string {
-	return "Cannot delete: " + m.Name + " : " + m.Err.Error()
+func (m *deletePlakError) Error() string {
+	return "Cannot delete: " + m.name + " : " + m.err.Error()
+}
+
+type createError struct {
+	message string
+}
+
+func (m *createError) Error() string {
+	return "create: cannot create plak: " + m.message
 }

internal/web/plak/plak.go

@@ -10,6 +10,7 @@ import (
 
 	"git.gnous.eu/gnouseu/plakken/internal/constant"
 	"git.gnous.eu/gnouseu/plakken/internal/database"
+	"git.gnous.eu/gnouseu/plakken/internal/secret"
 	"git.gnous.eu/gnouseu/plakken/internal/utils"
 	"github.com/redis/go-redis/v9"
 
@@ -24,26 +25,48 @@ type WebConfig struct {
 	Templates embed.FS
 }
 
-// Plak "Object" for plak
-type Plak struct {
+// plak "Object" for plak
+type plak struct {
 	Key        string
 	Content    string
 	Expiration time.Duration
 	DB         *redis.Client
 }
 
-// Create manage POST request for create Plak
-func (config WebConfig) Create(w http.ResponseWriter, r *http.Request) {
+// create a plak
+func (plak plak) create() (string, error) {
+	dbConf := database.DBConfig{
+		DB: plak.DB,
+	}
+
+	token, err := secret.GenerateToken()
+	if err != nil {
+		return "", err
+	}
+
+	if dbConf.UrlExist(plak.Key) {
+		return "", &createError{message: "key already exist"}
+	}
+
+	var hashedSecret string
+	hashedSecret, err = secret.Password(token)
+	if err != nil {
+		return "", err
+	}
+
+	dbConf.InsertPaste(plak.Key, plak.Content, hashedSecret, plak.Expiration)
+
+	return token, nil
+}
+
+// PostCreate manage POST request for create plak
+func (config WebConfig) PostCreate(w http.ResponseWriter, r *http.Request) {
 	content := r.FormValue("content")
 	if content == "" {
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
 
-	dbConf := database.DBConfig{
-		DB: config.DB,
-	}
-
 	filename := r.FormValue("filename")
 	var key string
 	if len(filename) == 0 {
@@ -53,46 +76,67 @@ func (config WebConfig) Create(w http.ResponseWriter, r *http.Request) {
 			w.WriteHeader(http.StatusBadRequest)
 			return
 		}
-		if dbConf.UrlExist(filename) {
-			w.WriteHeader(http.StatusBadRequest)
-			return
-		}
 		key = filename
 	}
 
-	secret := utils.GenerateSecret()
-	rawExpiration := r.FormValue("exp")
+	plak := plak{
+		Key:     key,
+		Content: content,
+		DB:      config.DB,
+	}
 
+	rawExpiration := r.FormValue("exp")
 	expiration, err := utils.ParseExpiration(rawExpiration)
 	if err != nil {
-		w.WriteHeader(http.StatusBadRequest)
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
 		return
-	} else if expiration == 0 {
-		dbConf.InsertPaste(key, content, secret, -1)
+	}
+
+	if expiration == 0 {
+		plak.Expiration = -1
 	} else {
-		dbConf.InsertPaste(key, content, secret, time.Duration(expiration*int(time.Second)))
+		plak.Expiration = time.Duration(expiration * int(time.Second))
+	}
+
+	_, err = plak.create()
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
 	}
 
 	http.Redirect(w, r, "/"+key, http.StatusSeeOther)
 }
 
-// CurlCreate Create plak with minimum param, ideal for curl. Force 7 day expiration
+// CurlCreate PostCreate plak with minimum param, ideal for curl. Force 7 day expiration
 func (config WebConfig) CurlCreate(w http.ResponseWriter, r *http.Request) {
 	if r.ContentLength == 0 {
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
+
 	content, _ := io.ReadAll(r.Body)
 	err := r.Body.Close()
 	if err != nil {
 		log.Println(err)
 	}
+
 	key := utils.GenerateUrl(config.UrlLength)
-	secret := utils.GenerateSecret()
-	dbConf := database.DBConfig{
+
+	plak := plak{
+		Key:        key,
+		Content:    string(content),
+		Expiration: constant.ExpirationCurlCreate,
 		DB:         config.DB,
 	}
-	dbConf.InsertPaste(key, string(content), secret, constant.ExpirationCurlCreate)
+
+	var token string
+	token, err = plak.create()
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
 
 	var baseURL string
 	if r.TLS == nil {
@@ -101,7 +145,7 @@ func (config WebConfig) CurlCreate(w http.ResponseWriter, r *http.Request) {
 		baseURL = "https://" + r.Host + "/" + key
 	}
 
-	message := baseURL + "\n" + "Delete with : 'curl -X DELETE " + baseURL + "?secret\\=" + secret + "'" + "\n"
+	message := baseURL + "\n" + "Delete with : 'curl -X DELETE " + baseURL + "?secret\\=" + token + "'" + "\n"
 
 	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 	_, err = io.WriteString(w, message)
@@ -115,18 +159,18 @@ func (config WebConfig) View(w http.ResponseWriter, r *http.Request) {
 	dbConf := database.DBConfig{
 		DB: config.DB,
 	}
-	var plak Plak
+	var currentPlak plak
 	key := r.PathValue("key")
 
 	if dbConf.UrlExist(key) {
-		plak = Plak{
+		currentPlak = plak{
 			Key: key,
 			DB:  config.DB,
 		}
-		plak = plak.GetContent()
+		currentPlak = currentPlak.getContent()
 		if r.PathValue("settings") == "raw" {
 			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
-			_, err := io.WriteString(w, plak.Content)
+			_, err := io.WriteString(w, currentPlak.Content)
 			if err != nil {
 				log.Println(err)
 			}
@@ -135,10 +179,13 @@ func (config WebConfig) View(w http.ResponseWriter, r *http.Request) {
 			if err != nil {
 				w.WriteHeader(http.StatusInternalServerError)
 				log.Println(err)
+				return
 			}
-			err = t.Execute(w, plak)
+			err = t.Execute(w, currentPlak)
 			if err != nil {
+				w.WriteHeader(http.StatusInternalServerError)
 				log.Println(err)
+				return
 			}
 		}
 	} else {
@@ -146,24 +193,35 @@ func (config WebConfig) View(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-// Delete manage plak deletion endpoint
-func (config WebConfig) Delete(w http.ResponseWriter, r *http.Request) {
+// DeleteRequest manage plak deletion endpoint
+func (config WebConfig) DeleteRequest(w http.ResponseWriter, r *http.Request) {
 	dbConf := database.DBConfig{
 		DB: config.DB,
 	}
 	key := r.PathValue("key")
+	var valid bool
 
 	if dbConf.UrlExist(key) {
-		secret := r.URL.Query().Get("secret")
-		if dbConf.VerifySecret(key, secret) {
-			plak := Plak{
+		var err error
+		token := r.URL.Query().Get("secret")
+
+		valid, err = dbConf.VerifySecret(key, token)
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			log.Println(err)
+			return
+		}
+
+		if valid {
+			plak := plak{
 				Key: key,
 				DB:  config.DB,
 			}
-			err := plak.deletePlak()
+			err := plak.delete()
 			if err != nil {
 				log.Println(err)
 			}
+
 			w.WriteHeader(http.StatusNoContent)
 			return
 		} else {
@@ -171,22 +229,23 @@ func (config WebConfig) Delete(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
+
 	w.WriteHeader(http.StatusNotFound)
 }
 
-// deletePlak Delete plak from database
-func (plak Plak) deletePlak() error {
+// delete DeleteRequest plak from database
+func (plak plak) delete() error {
 	err := plak.DB.Del(ctx, plak.Key).Err()
 	if err != nil {
 		log.Println(err)
-		return &DeletePlakError{Name: plak.Key, Err: err}
+		return &deletePlakError{name: plak.Key, err: err}
 	}
 
 	return nil
 }
 
-// GetContent get plak content
-func (plak Plak) GetContent() Plak {
+// getContent get plak content
+func (plak plak) getContent() plak {
 	plak.Content = plak.DB.HGet(ctx, plak.Key, "content").Val()
 	return plak
 }

test/secret/secret_test.go

@@ -0,0 +1,47 @@
+package secret_test
+
+import (
+	"fmt"
+	"regexp"
+	"testing"
+
+	"git.gnous.eu/gnouseu/plakken/internal/constant"
+	"git.gnous.eu/gnouseu/plakken/internal/secret"
+	"golang.org/x/crypto/argon2"
+)
+
+func TestPasswordFormat(t *testing.T) {
+	regex := fmt.Sprintf("\\$argon2id\\$v=%d\\$m=%d,t=%d,p=%d\\$[A-Za-z0-9+/]*\\$[A-Za-z0-9+/]*$", argon2.Version, constant.ArgonMemory, constant.ArgonIterations, constant.ArgonThreads)
+
+	got, err := secret.Password("Password!")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	result, _ := regexp.MatchString(regex, got)
+	if !result {
+		t.Fatal("Error in Password, format is not valid "+": ", got)
+	}
+}
+
+func TestVerifyPassword(t *testing.T) {
+	result, err := secret.VerifyPassword("Password!", "$argon2id$v=19$m=65536,t=2,p=4$A+t5YGpyy1BHCbvk/LP1xQ$eNuUj6B2ZqXlGi6KEqep39a7N4nysUIojuPXye+Ypp0")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !result {
+		t.Fatal("Error in VerifyPassword, got:", result, "want: ", true)
+	}
+}
+
+func TestVerifyPasswordInvalid(t *testing.T) {
+	result, err := secret.VerifyPassword("notsamepassword", "$argon2id$v=19$m=65536,t=2,p=4$A+t5YGpyy1BHCbvk/LP1xQ$eNuUj6B2ZqXlGi6KEqep39a7N4nysUIojuPXye+Ypp0")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if result {
+		t.Fatal("Error in VerifyPassword, got:", result, "want: ", false)
+	}
+}