helpers: apply id and lang attr regexps to full string #198
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The intent of the code seemed to be to allow ids and langs where the full string matches the regular expression, not just part of it.
diasbruno
reviewed
Sep 9, 2024
| @@ -148,15 +148,15 @@ func (p *Policy) AllowStandardAttributes() { | |||
| p.AllowAttrs("dir").Matching(Direction).Globally() | |||
| p.AllowAttrs( | |||
| "lang", | |||
| ).Matching(regexp.MustCompile(`[a-zA-Z]{2,20}`)).Globally() | |||
| ).Matching(regexp.MustCompile(`^[a-zA-Z]{2,20}$`)).Globally() | |||
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ˆ and $ can be abused by attackers. Check if it's possible to use \A or \z.
Example: \A[a-zA-Z]{2,20}\z
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I think this is fine? Unless the ?m flag is provided, ^ and $ match the beginning and end of the text, not the beginning and end of the line. (See https://pkg.go.dev/regexp/syntax)
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Nice. So just need to guarantee that the flag is enabled.
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The intent of the code seemed to be to allow ids and langs where the full string matches the regular expression, not just part of it.