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PubKeyAuth.cs
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PubKeyAuth.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Extensions.Configuration;
using Netezos.Encoding;
using Netezos.Keys;
using Netezos.Utils;
namespace Tzkt.Api.Services.Auth
{
public class PubKeyAuth : IAuthService
{
readonly AuthConfig Config;
readonly Dictionary<string, long> Nonces;
readonly Dictionary<string, Dictionary<string, (Access access, Dictionary<string, Access> sections)>> Rights;
readonly Dictionary<string, PubKey> PubKeys;
public PubKeyAuth(IConfiguration config)
{
var cfg = config.GetAuthConfig();
Config = cfg;
Nonces = cfg.Users.ToDictionary(x => x.Name, _ => long.MinValue );
Rights = cfg.Users.ToDictionary(x => x.Name, x => x.Rights?
.GroupBy(g => g.Table)
.ToDictionary(g => g.Key, g =>
(
g.FirstOrDefault(r => r.Section == null)?.Access ?? Access.None,
g.Where(r => r.Section != null).ToDictionary(r => r.Section, r => r.Access)
)));
PubKeys = cfg.Users.ToDictionary(x => x.Name, x => PubKey.FromBase58(x.PubKey));
}
public bool TryAuthenticate(AuthHeaders headers, AccessRights requestedRights, out string error)
{
if (!TryAuthenticateBase(headers, requestedRights, out error, out var pubKey))
{
return false;
}
if (!pubKey.Verify($"{headers.Nonce}", headers.Signature))
{
error = $"Invalid signature";
return false;
}
Nonces[headers.User] = (long) headers.Nonce;
return true;
}
public bool TryAuthenticate(AuthHeaders headers, AccessRights requestedRights, string json, out string error)
{
if (!TryAuthenticateBase(headers, requestedRights, out error, out var pubKey))
{
return false;
}
if (string.IsNullOrEmpty(json))
{
error = $"Request body is empty";
return false;
}
var hash = Hex.Convert(Blake2b.GetDigest(Utf8.Parse(json)));
if (!pubKey.Verify($"{headers.Nonce}{hash}", headers.Signature))
{
error = $"Invalid signature";
return false;
}
Nonces[headers.User] = (long)headers.Nonce;
return true;
}
private bool TryAuthenticateBase(AuthHeaders headers, AccessRights requestedRights, out string error, out PubKey pubKey)
{
error = null;
pubKey = null;
if (string.IsNullOrEmpty(headers?.User))
{
error = "The X-TZKT-USER header is required";
return false;
}
if (headers.Nonce == null)
{
error = "The X-TZKT-NONCE header is required";
return false;
}
if (string.IsNullOrEmpty(headers.Signature))
{
error = "The X-TZKT-SIGNATURE header is required";
return false;
}
if (!PubKeys.TryGetValue(headers.User, out pubKey))
{
error = $"User {headers.User} doesn't exist";
return false;
}
var nonce = (long)headers.Nonce;
if (nonce is < 0 or >= 253402300800000)
{
error = $"Nonce out of range.";
return false;
}
var nonceTime = DateTime.UnixEpoch.AddMilliseconds(nonce);
if (nonceTime < DateTime.UtcNow.AddSeconds(-Config.NonceLifetime))
{
error = $"Nonce too old. Server time: {DateTime.UtcNow}, nonce: {nonceTime}";
return false;
}
if (nonce <= Nonces[headers.User])
{
error = $"Nonce {nonce} has already been used";
return false;
}
if (!Rights.TryGetValue(headers.User, out var rights))
{
error = $"User {headers.User} doesn't exist";
return false;
}
if (rights == null)
{
return true;
}
if (!rights.TryGetValue(requestedRights.Table, out var tableRights))
{
error = $"User {headers.User} doesn't have required permissions. {requestedRights.Table} required.";
return false;
}
if (tableRights.access >= requestedRights.Access)
{
return true;
}
if (requestedRights.Section == null)
{
error = $"User {headers.User} doesn't have required permissions. {requestedRights.Access} required.";
return false;
}
if (!tableRights.sections.TryGetValue(requestedRights.Section, out var sectionAccess))
{
error = $"User {headers.User} doesn't have required permissions. {requestedRights.Section} required.";
return false;
}
if (sectionAccess < requestedRights.Access)
{
error = $"User {headers.User} doesn't have required permissions. {requestedRights.Access} required for section {requestedRights.Section}. {sectionAccess} granted";
return false;
}
return true;
}
}
}