如何在 C# 中转义字符串，以用于 LDAP 查询

问题描述

我有一个 LDAP 查询，我用它在 C# 中执行搜索.它使用两个字符串变量(用户名和域)，出于安全原因需要对其进行转义.

I have an LDAP query, which I am using to perform a search in C#. It uses two string variables (username and domain) which need to be escaped for security reasons.

我应该如何转义字符串?C#.NET 中是否有可用的函数来执行此操作?

How should I escape the strings? Is there a function available in C#.NET to do this?

LDAP 搜索条件示例:

Example LDAP search conditions :

(objectCategory=person)
(userprincipalname=username@domain*)
(samaccountname=username)

C# 中的 LDAP 查询字符串示例:

Example LDAP query string in C# :

string search = "(&(&(objectCategory=person)(userprincipalname=" 
        + username 
        + "@"
        + domain 
        + "*)(samaccountname=" 
        + username 
        + ")))";

我已经有 LDAP 查询工作，并返回结果.我想要的只是转义参数.

I already have the LDAP query working, and returning results. All I want is to escape the parameters.

推荐答案

以下是我从Sophia提到的Java代码翻译成C#.

The following is my translation from the Java code mentioned by Sophia into C#.

/// <summary>
/// Escapes the LDAP search filter to prevent LDAP injection attacks.
/// </summary>
/// <param name="searchFilter">The search filter.</param>
/// <see cref="https://blogs.oracle.com/shankar/entry/what_is_ldap_injection" />
/// <see cref="http://msdn.microsoft.com/en-us/library/aa746475.aspx" />
/// <returns>The escaped search filter.</returns>
private static string EscapeLdapSearchFilter(string searchFilter)
{
    StringBuilder escape = new StringBuilder(); // If using JDK >= 1.5 consider using StringBuilder
    for (int i = 0; i < searchFilter.Length; ++i)
    {
        char current = searchFilter[i];
        switch (current)
        {
            case '\':
                escape.Append(@"5c");
                break;
            case '*':
                escape.Append(@"2a");
                break;
            case '(':
                escape.Append(@"28");
                break;
            case ')':
                escape.Append(@"29");
                break;
            case 'u0000':
                escape.Append(@"0");
                break;
            case '/':
                escape.Append(@"2f");
                break;
            default:
                escape.Append(current);
                break;
        }
    }

    return escape.ToString();
}

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