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A plaintext implementation of ISecureDataFormat<AuthenticationTicket> for educational purposes.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using Microsoft.AspNet.Identity;
using Microsoft.Owin.Security;
namespace ScrambledBrains {
public class PlaintextSecureDataFormat : ISecureDataFormat<AuthenticationTicket> {
public string Protect(AuthenticationTicket data) {
return string.Format(
"{0} {1} {2} {3}",
data.Identity.GetUserId(),
data.Identity.GetUserName(),
string.Join("&",data.Identity.FindAll(ClaimTypes.Role).Select(c => c.Value)),
string.Join("&", data.Identity.FindAll(IsNotSpecialClaim).Select(c => c.Type + "=" + Uri.EscapeDataString(c.Value)))
);
}
private static readonly string[] _specialTypes = new[]
{
ClaimTypes.Role,
ClaimTypes.Name,
ClaimTypes.NameIdentifier,
"http://schemas.microsoft.com/accesscontrolservice/2010/07/claims/identityprovider"
};
private bool IsNotSpecialClaim(Claim claim)
{
return !_specialTypes.Contains(claim.Type);
}
public AuthenticationTicket Unprotect(string protectedText) {
try {
string[] parts = protectedText.Split(' ');
List<Claim> claims = new List<Claim> {
new Claim(ClaimTypes.NameIdentifier, parts[0]),
new Claim(ClaimTypes.Name, parts[1]),
new Claim(
"http://schemas.microsoft.com/accesscontrolservice/2010/07/claims/identityprovider",
"ASP.NET Identity"
)
};
if (parts.Length > 2 && parts[2] != "") {
foreach (string role in parts[2].Split('&')) {
if (role == "") { continue; }
claims.Add(new Claim(ClaimTypes.Role, role));
}
}
if (parts.Length > 3 && parts[3] != "")
{
foreach (string claim in parts[3].Split('&'))
{
string[] claimParts = claim.Split('=');
claims.Add(new Claim(claimParts[0], Uri.UnescapeDataString(claimParts[1])));
}
}
AuthenticationTicket authenticationTicket = new AuthenticationTicket(
new ClaimsIdentity(
claims,
"ApplicationCookie",
ClaimsIdentity.DefaultNameClaimType,
ClaimsIdentity.DefaultRoleClaimType
),
new AuthenticationProperties {
ExpiresUtc = DateTimeOffset.MaxValue,
IssuedUtc = DateTimeOffset.UtcNow
}
);
return authenticationTicket;
}
catch { return null; }
}
}
}
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