在自定义条件下清理 SQL

问题描述

我需要创建一个简单的搜索，但我负担不起使用 Sphinx.

这是我写的:

关键字 = input.split(/\s+/)查询 = []关键字.每个做|关键字|查询<

现在，sanitize_sql_for_conditions 不起作用！它返回只是返回原始字符串.

如何重写此代码以逃避恶意代码?

解决方案

如果将#{keyword}"替换为?"，您可以执行以下操作.使用问号会自动清理 SQL.

keywords = input.split(/\s+/)查询 = []变量 = []关键字.每个做|关键字|查询<

I need to create a simple search but I can't afford to use Sphinx.

Here's what I wrote:

keywords = input.split(/\s+/)
queries = []

keywords.each do |keyword|
  queries << sanitize_sql_for_conditions(
              "(classifications.species LIKE '%#{keyword}%' OR
               classifications.family LIKE '%#{keyword}%' OR
               classifications.trivial_names LIKE '%#{keyword}%' OR
               place LIKE '%#{keyword}%')")
end

options[:conditions] = queries.join(' AND ')

Now, sanitize_sql_for_conditions does NOT work! It returns simply returns the original string.

How can I rewrite this code to escape malicious code?

解决方案

If you replace the "#{keyword}" with a "?", you can do something like this. Using the question mark will automatically sanitize SQL.

keywords = input.split(/\s+/)
queries = []
vars = []

keywords.each do |keyword|
  queries << "(classifications.species LIKE '%?%' OR
               classifications.family LIKE '%?%' OR
               classifications.trivial_names LIKE '%?%' OR
               place LIKE '%?%')"
  vars = vars << keyword << keyword << keyword << keyword
end

options[:conditions] = [queries.join(' AND '), vars].flatten

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