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Fixed IsLocalUrl #1

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Fixed IsLocalUrl #1

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18 changes: 16 additions & 2 deletions src/IdentityServer4/src/Extensions/StringsExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,7 @@ public static bool IsLocalUrl(this string url)
// url doesn't start with "//" or "/\"
if (url[1] != '/' && url[1] != '\\')
{
return true;
return !HasControlCharacter(url.AsSpan(1));
}

return false;
Expand All @@ -181,13 +181,27 @@ public static bool IsLocalUrl(this string url)
// url doesn't start with "~//" or "~/\"
if (url[2] != '/' && url[2] != '\\')
{
return true;
return !HasControlCharacter(url.AsSpan(2));;
}

return false;
}

return false;

static bool HasControlCharacter(ReadOnlySpan<char> readOnlySpan)
{
// URLs may not contain ASCII control characters.
for (var i = 0; i < readOnlySpan.Length; i++)
{
if (char.IsControl(readOnlySpan[i]))
{
return true;
}
}

return false;
}
}

[DebuggerStepThrough]
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