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Validate header value in AddResponseFromClaims #25

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May 27, 2021
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Validate header value in AddResponseFromClaims #25

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7 changes: 6 additions & 1 deletion OCP.Msal.Proxy.Web/Controllers/AuthController.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -108,8 +108,13 @@ internal static void AddResponseHeadersFromClaims(IEnumerable<Claim> claims, IHe
var claimName = claim.Type;
if (claimName.Contains("/")) claimName = claimName.Split('/')[claimName.Split('/').Length - 1];
var name = $"X-Injected-{claimName}";
if (!headers.ContainsKey(name)) headers.Add(name, claim.Value);
if (!headers.ContainsKey(name) && IsValidHeaderValue(claim.Value)) headers.Add(name, claim.Value);
}
}

internal static bool IsValidHeaderValue(string value)
{
return value.All(c => c >= 32 && c < 127);
}
}
}