feat: add changing user password route for htpasswd

errors/errors.go

@@ -168,4 +168,12 @@ var (
 	ErrAPINotSupported                = errors.New("registry at the given address doesn't implement the correct API")
 	ErrURLNotFound                    = errors.New("url not found")
 	ErrInvalidSearchQuery             = errors.New("invalid search query")
+
+	// ErrPasswordsDoNotMatch returned if given password does not match existing user's password.
+	ErrPasswordsDoNotMatch = errors.New("passwords do not match")
+	// ErrOldPasswordIsWrong returned if provided old password for user verification
+	// during the password change is wrong.
+	ErrOldPasswordIsWrong = errors.New("old password is wrong")
+	// ErrPasswordIsEmpty returned if user's new password is empty.
+	ErrPasswordIsEmpty = errors.New("password can not be empty")
 )

pkg/api/authn.go

@@ -1,7 +1,6 @@
 package api
 
 import (
-	"bufio"
 	"context"
 	"crypto/sha256"
 	"crypto/x509"
@@ -27,7 +26,6 @@ import (
 	"github.com/zitadel/oidc/pkg/client/rp"
 	httphelper "github.com/zitadel/oidc/pkg/http"
 	"github.com/zitadel/oidc/pkg/oidc"
-	"golang.org/x/crypto/bcrypt"
 	"golang.org/x/oauth2"
 	githubOAuth "golang.org/x/oauth2/github"
 
@@ -47,9 +45,9 @@ const (
 )
 
 type AuthnMiddleware struct {
-	credMap    map[string]string
-	ldapClient *LDAPClient
-	log        log.Logger
+	htpasswdClient *HtpasswdClient
+	ldapClient     *LDAPClient
+	log            log.Logger
 }
 
 func AuthHandler(ctlr *Controller) mux.MiddlewareFunc {
@@ -110,10 +108,10 @@ func (amw *AuthnMiddleware) basicAuthn(ctlr *Controller, userAc *reqCtx.UserAcce
 		return false, nil
 	}
 
-	passphraseHash, ok := amw.credMap[identity]
+	passphraseHash, ok := amw.htpasswdClient.Get(identity)
 	if ok {
 		// first, HTTPPassword authN (which is local)
-		if err := bcrypt.CompareHashAndPassword([]byte(passphraseHash), []byte(passphrase)); err == nil {
+		if err := amw.htpasswdClient.CheckPassword(identity, passphraseHash); err == nil {
 			// Process request
 			var groups []string
 
@@ -255,8 +253,6 @@ func (amw *AuthnMiddleware) tryAuthnHandlers(ctlr *Controller) mux.MiddlewareFun
 		return noPasswdAuth(ctlr)
 	}
 
-	amw.credMap = make(map[string]string)
-
 	delay := ctlr.Config.HTTP.Auth.FailDelay
 
 	// ldap and htpasswd based authN
@@ -308,25 +304,6 @@ func (amw *AuthnMiddleware) tryAuthnHandlers(ctlr *Controller) mux.MiddlewareFun
 		}
 	}
 
-	if ctlr.Config.IsHtpasswdAuthEnabled() {
-		credsFile, err := os.Open(ctlr.Config.HTTP.Auth.HTPasswd.Path)
-		if err != nil {
-			amw.log.Panic().Err(err).Str("credsFile", ctlr.Config.HTTP.Auth.HTPasswd.Path).
-				Msg("failed to open creds-file")
-		}
-		defer credsFile.Close()
-
-		scanner := bufio.NewScanner(credsFile)
-
-		for scanner.Scan() {
-			line := scanner.Text()
-			if strings.Contains(line, ":") {
-				tokens := strings.Split(scanner.Text(), ":")
-				amw.credMap[tokens[0]] = tokens[1]
-			}
-		}
-	}
-
 	// openid based authN
 	if ctlr.Config.IsOpenIDAuthEnabled() {
 		ctlr.RelyingParties = make(map[string]rp.RelyingParty)

pkg/api/constants/consts.go

@@ -19,6 +19,7 @@ const (
 	LoginPath                    = AppNamespacePath + "/auth/login"
 	LogoutPath                   = AppNamespacePath + "/auth/logout"
 	APIKeyPath                   = AppNamespacePath + "/auth/apikey"
+	ChangePasswordPath           = AppNamespacePath + "/auth/change_password"
 	SessionClientHeaderName      = "X-ZOT-API-CLIENT"
 	SessionClientHeaderValue     = "zot-ui"
 	APIKeysPrefix                = "zak_"

pkg/api/controller.go

@@ -50,6 +50,7 @@ type Controller struct {
 	CookieStore     *CookieStore
 	LDAPClient      *LDAPClient
 	taskScheduler   *scheduler.Scheduler
+	HtpasswdClient  *HtpasswdClient
 	// runtime params
 	chosenPort int // kernel-chosen port
 }
@@ -243,6 +244,12 @@ func (c *Controller) Init() error {
 
 	c.InitCVEInfo()
 
+	if c.Config.IsHtpasswdAuthEnabled() {
+		if err := c.initHtpasswdClient(); err != nil {
+			return err
+		}
+	}
+
 	return nil
 }
 
@@ -280,6 +287,16 @@ func (c *Controller) initCookieStore() error {
 	return nil
 }
 
+func (c *Controller) initHtpasswdClient() error {
+	if c.Config.IsHtpasswdAuthEnabled() {
+		c.HtpasswdClient = NewHtpasswdClient(c.Config.HTTP.Auth.HTPasswd.Path)
+
+		return c.HtpasswdClient.Init()
+	}
+
+	return nil
+}
+
 func (c *Controller) InitMetaDB() error {
 	// init metaDB if search is enabled or we need to store user profiles, api keys or signatures
 	if c.Config.IsSearchEnabled() || c.Config.IsBasicAuthnEnabled() || c.Config.IsImageTrustEnabled() ||

pkg/api/htpasswd.go

@@ -0,0 +1,209 @@
+package api
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"golang.org/x/crypto/bcrypt"
+
+	zerr "zotregistry.dev/zot/errors"
+	"zotregistry.dev/zot/pkg/storage/constants"
+)
+
+const (
+	htpasswdValidTokensNumber = 2
+)
+
+type HtpasswdClient struct {
+	credMap  credMap
+	credFile credFile
+}
+
+type credFile struct {
+	path string
+	rw   *sync.RWMutex
+}
+
+type credMap struct {
+	m  map[string]string
+	rw *sync.RWMutex
+}
+
+func NewHtpasswdClient(filepath string) *HtpasswdClient {
+	return &HtpasswdClient{
+		credFile: credFile{
+			path: filepath,
+			rw:   &sync.RWMutex{},
+		},
+		credMap: credMap{
+			m:  make(map[string]string),
+			rw: &sync.RWMutex{},
+		},
+	}
+}
+
+// Init initializes the HtpasswdClient.
+// It performs the credFile read using the filename specified in NewHtpasswdClient
+// and caches all user passwords.
+func (hc *HtpasswdClient) Init() error {
+	credsFile, err := os.Open(hc.credFile.path)
+	if err != nil {
+		return fmt.Errorf("error occurred while opening creds-credFile: %w", err)
+	}
+	defer credsFile.Close()
+
+	hc.credMap.rw.Lock()
+	defer hc.credMap.rw.Unlock()
+
+	scanner := bufio.NewScanner(credsFile)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.Contains(line, ":") {
+			tokens := strings.Split(line, ":")
+			if len(tokens) == htpasswdValidTokensNumber {
+				hc.credMap.m[tokens[0]] = tokens[1]
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return fmt.Errorf("error occurred while reading creds-credFile: %w", err)
+	}
+
+	return nil
+}
+
+// Get returns the password associated with the login and a bool
+// indicating whether the login was found.
+// It does not check whether the user's password is correct.
+func (hc *HtpasswdClient) Get(login string) (string, bool) {
+	return hc.credMap.Get(login)
+}
+
+// Set sets the new password. It does not perform any checks,
+// the only error is possible is encryption error.
+func (hc *HtpasswdClient) Set(login, password string) error {
+	passphrase, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return fmt.Errorf("error occurred while cheking passwords: %w", err)
+	}
+
+	return hc.credMap.Set(login, string(passphrase))
+}
+
+// CheckPassword checks whether the user has a specified password.
+// It returns an error if the user is not found or passwords do not match,
+// and returns the nil on passwords match.
+func (hc *HtpasswdClient) CheckPassword(login, password string) error {
+	passwordHash, ok := hc.Get(login)
+	if !ok {
+		return zerr.ErrBadUser
+	}
+
+	err := bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(password))
+	if err != nil {
+		return zerr.ErrPasswordsDoNotMatch
+	}
+
+	return nil
+}
+
+// ChangePassword changes the user password.
+// It accepts user login, his supposed old password for verification and new password.
+func (hc *HtpasswdClient) ChangePassword(login, supposedOldPassword, newPassword string) error {
+	if len(newPassword) == 0 {
+		return zerr.ErrPasswordIsEmpty
+	}
+
+	oldPassphrase, ok := hc.credMap.Get(login)
+	if !ok {
+		return zerr.ErrBadUser
+	}
+
+	// given old password must match actual old password
+	if err := bcrypt.CompareHashAndPassword([]byte(oldPassphrase), []byte(supposedOldPassword)); err != nil {
+		return zerr.ErrOldPasswordIsWrong
+	}
+
+	// if passwords match, no need to update credFile and map, return nil as if operation is successful
+	if err := bcrypt.CompareHashAndPassword([]byte(oldPassphrase), []byte(newPassword)); err == nil {
+		return nil
+	}
+
+	// encrypt new password
+	newPassphrase, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return fmt.Errorf("error occurred while encrypting new password: %w", err)
+	}
+
+	file, err := os.ReadFile(hc.credFile.path)
+	if err != nil {
+		return fmt.Errorf("error occurred while reading creds-credFile: %w", err)
+	}
+
+	// read passwords line by line to find the corresponding login
+	lines := strings.Split(string(file), "\n")
+	for i, line := range lines {
+		if tokens := strings.Split(line, ":"); len(tokens) == htpasswdValidTokensNumber {
+			if tokens[0] == login {
+				lines[i] = tokens[0] + ":" + string(newPassphrase)
+
+				break
+			}
+		}
+	}
+
+	// write new content to temporary credFile
+	// and replace the old credFile with temporary, so the operation is atomic
+	output := []byte(strings.Join(lines, "\n"))
+
+	tmpfile, err := os.CreateTemp(filepath.Dir(hc.credFile.path), "htpasswd-*.tmp")
+	if err != nil {
+		return fmt.Errorf("error occurred when creating temp htpasswd credFile: %w", err)
+	}
+
+	if _, err := tmpfile.Write(output); err != nil {
+		tmpfile.Close()
+		os.Remove(tmpfile.Name())
+
+		return fmt.Errorf("error occurred when writing to temp htpasswd credFile: %w", err)
+	}
+
+	if err := tmpfile.Close(); err != nil {
+		os.Remove(tmpfile.Name())
+
+		return fmt.Errorf("error occurred when closing temp htpasswd credFile: %w", err)
+	}
+
+	if err := os.Rename(tmpfile.Name(), hc.credFile.path); err != nil {
+		return fmt.Errorf("error occurred while replacing htpasswd credFile with new credFile: %w", err)
+	}
+
+	err = os.WriteFile(hc.credFile.path, output, constants.DefaultDirPerms)
+	if err != nil {
+		return fmt.Errorf("error occurred while writing to creds-credFile: %w", err)
+	}
+
+	// set to credMap only if all credFile operations are successful to prevent collisions
+	return hc.credMap.Set(login, string(newPassphrase))
+}
+
+func (c credMap) Set(login, passphrase string) error {
+	c.rw.Lock()
+	c.m[login] = passphrase
+	c.rw.Unlock()
+
+	return nil
+}
+
+func (c credMap) Get(login string) (string, bool) {
+	c.rw.RLock()
+	defer c.rw.RUnlock()
+	passphrase, ok := c.m[login]
+
+	return passphrase, ok
+}