为什么 check_password_hash 函数返回 false？使用 Flask、SQLite3 和 Werkzeug

Question

我正在尝试使用 Flask、Werkzeug 和 SQLite 创建一个基本的登录功能。用户可以注册并且他们的密码哈希存储在 SQLite 数据库中，但是当我尝试使用正确的密码登录时 check_password_hash returns false.

目前我正在将用户提供的密码与存储在 SQLite 数据库中的相关哈希进行比较，该数据库是在用户注册时使用 generate_password_hash 创建的。我已阅读 Werkzeug 文档，但找不到任何解决方案。

也许这与 generate_password_hash 从不输出相同的散列两次有关？尽管我认为 check_password_hash 能够解决这个问题？

代码如下：

@app.route("/register", methods=["GET", "POST"])
def register():
    """Register user"""
    if request.method == "GET":
        return render_template("register.html")
    if request.method == "POST":
            with sqlite3.connect("finance.db") as conn:
                cur = conn.cursor() 
                username = request.form.get("username")
                password = request.form.get("password")
                confirm_password = request.form.get("confirm-password")
                hash_value = generate_password_hash(password)
                cur.execute("SELECT * FROM users WHERE username=?", (username,))
                valid_username = cur.fetchone()
                
                # Check input and format: Username already taken? Username entered? Password entered? passwords match?
                if valid_username:
                    return ("Username not available")
                if not username:
                    return("Please enter a username")
                elif not password:
                    return("Please enter a password")
                elif not confirm_password:
                    return("Please confirm your password")
                elif password != confirm_password:
                    return ("Passwords do not match")
                else:
                    cur.execute("INSERT INTO users (username,hash) VALUES (?,?)", (username,hash_value))
                    return redirect("/")



@app.route("/login", methods=["GET", "POST"])
def login():
    """Log user in"""

    # Forget any user_id
    session.clear()

    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # Ensure username was submitted
        if not request.form.get("username"):
            return apology("must provide username", 403)

        # Ensure password was submitted
        elif not request.form.get("password"):
            return apology("must provide password", 403)
# User login
# Query database for username and hash
        with sqlite3.connect("finance.db") as conn:
            cur = conn.cursor()
            username_field = request.form.get("username")
            cur.execute("SELECT username FROM users WHERE username = ?", (username_field,))
            username = cur.fetchall()
            cur.execute("SELECT hash FROM users WHERE username = ?", (username_field,))
            pwhash = cur.fetchone()

            # Ensure username exists and password is correct           
            if len(username) != 1 or not check_password_hash(pwhash, request.form.get("password")):
                print(check_password_hash(pwhash, request.form.get("password")))
                return apology("invalid username and/or password", 403)
            return redirect("/")

    # User reached route via GET (as by clicking a link or via redirect)
    else:
        return render_template("login.html")

在此先感谢您的帮助。

Answer 1

啊哈！解决了。语法错误，pwhash` 是一个元组，因为那是 fetchone() returns，所以它需要是 check_password_hash(pwhash[0], request.form.get("password")) 谢谢这么多的支持。我没有想到要单独测试 check_password_hash 函数，这样做让我意识到我正在使用一个元组。干杯@JanL。祝你有个愉快的一天。

为什么 check_password_hash 函数返回 false？使用 Flask、SQLite3 和 Werkzeug

Why is check_password_hash function returning false? Using Flask, SQLite3 and Werkzeug

python

werkzeug

flask