Login without password in Doudian: Can it be achieved by just using cookies?

Login without password in Doudian: Cookies are not master keys

This article analyzes the possibility of using cookies to achieve password-free login in Doudian, as well as the problems and solutions encountered by users in practice. A developer used the Electron Vue framework to load Doudian web pages through the webview tag, trying to achieve password-free login by saving and reading cookies, but encountered a network error.

The developer tried to save all cookies and use only PHPSESSID, none of which succeeded. The problem is that relying solely on cookies cannot achieve stable password-free login.

The answer points out that the authentication mechanism of Doudian server does not solely rely on cookies. In addition to cookies, the server may also rely on other HTTP request header information, such as User-Agent, etc. to verify the user's identity. Therefore, to achieve a password-free login, you need to simulate a complete HTTP request, including all necessary header information, rather than just cookies. This method can achieve a short-term password-free login effect.

However, this approach has limitations:

• Cookie validity period limit: The validity period of cookies is limited, which not only depends on the browser settings, but also on the session management mechanism on the Doudian server side. The refresh mechanism between the browser and the server can maintain the session for a period of time, but it cannot guarantee permanent password-free login.
• Security risk: If this method is successfully implemented, it may very likely mean that there are security vulnerabilities in the Doudian system. Any attempt to bypass the system's security mechanism should be taken with caution and bear corresponding risks. The effectiveness of this method may also fail at any time.

In short, although using cookies can try to log in to Doudian without password, relying on cookies alone is far from enough. A full HTTP request is required to be simulated, but this still does not guarantee a permanent password-free login and poses a security risk.

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