Question

我有一个AspNetCore应用程序，该应用程序基于PFX证书为我生成JWT令牌。

public string GenerateToken()
{
    using (var certificate = new X509Certificate2("certificate.pfx"))
    {
        var credentials = new X509SigningCredentials(certificate);
        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(new Claim[]
            {
                new Claim(ClaimTypes.Name, "Name"),
                new Claim(ClaimTypes.Role, "Tester"),
            }),
            IssuedAt = DateTime.UtcNow,
            Expires = DateTime.UtcNow.AddDays(1),
            SigningCredentials = credentials
        };

        var handler = new JwtSecurityTokenHandler();
        var token = handler.CreateToken(tokenDescriptor);
        return handler.WriteToken(token);
    }
}

使用相同的PFX，您可以验证签名是否有效。

public ClaimsPrincipal ValidateToken(string token)
{
    using (var certificate = new X509Certificate2("certificate.pfx"))
    {
        var key = new X509SecurityKey(certificate);
        var validationParameters = new TokenValidationParameters()
        {
            ValidateAudience = false,
            ValidateIssuer = false,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            IssuerSigningKey = key
        };

        var handler = new JwtSecurityTokenHandler();
        try
        {
            var claims = handler.ValidateToken(token, validationParameters, out var validatedToken);
            if (claims != null && validatedToken != null)
            {
                return claims;
            }
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex);
        }
    }

    return null;
}

但这要求其他只需要验证JWT令牌的应用程序也可以访问此PFX证书。

如果我使用此PFX获取生成的令牌

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并将其放在https://jwt.io/中，我只需要公用密钥即可验证签名。

我只希望其他应用程序需要我的公钥，这样我就不必在多个应用程序上分发PFX（这使它们可以自己生成JWT令牌）。

如何仅使用AspNetCore中的公钥来验证使用X509证书签名的JWT令牌？

Answer 1

根据@ Crypt32的建议，我能够生成单独的证书。

using (var certificate = new X509Certificate2("certificate.pfx"))
{
    using (var file = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read))
    {
        await file.WriteAsync(certificate.RawData);
    }
}

有了这个新证书，我能够成功验证令牌，但是在尝试创建新令牌时，我收到了InvalidOperationException。

System.InvalidOperationException
  HResult=0x80131509
  Message=IDX10638: Cannot create the SignatureProvider, 'key.HasPrivateKey' is false, cannot create signatures. Key: [PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.].
  Source=Microsoft.IdentityModel.Tokens
  StackTrace:
   at Microsoft.IdentityModel.Tokens.AsymmetricSignatureProvider..ctor(SecurityKey key, String algorithm, Boolean willCreateSignatures)
   at Microsoft.IdentityModel.Tokens.CryptoProviderFactory.CreateSignatureProvider(SecurityKey key, String algorithm, Boolean willCreateSignatures)
   at Microsoft.IdentityModel.JsonWebTokens.JwtTokenUtilities.CreateEncodedSignature(String input, SigningCredentials signingCredentials)
   at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.CreateJwtSecurityTokenPrivate(String issuer, String audience, ClaimsIdentity subject, Nullable`1 notBefore, Nullable`1 expires, Nullable`1 issuedAt, SigningCredentials signingCredentials, EncryptingCredentials encryptingCredentials)
   at System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.CreateToken(SecurityTokenDescriptor tokenDescriptor)

因此，这似乎是分发JWT令牌验证器的方式。

如何在AspNetCore中仅使用公共密钥来验证用x509签名的JWT令牌

1 个答案: