| | | 1 | | // SPDX-FileCopyrightText: 2026 Alper Çelik <alper@alper-celik.dev> |
| | | 2 | | // |
| | | 3 | | // SPDX-License-Identifier: AGPL-3.0-or-later |
| | | 4 | | |
| | | 5 | | using System.Buffers.Text; |
| | | 6 | | using System.Security.Claims; |
| | | 7 | | using System.Text.Encodings.Web; |
| | | 8 | | using Api.Auth.Models; |
| | | 9 | | using Api.Auth.Utils; |
| | | 10 | | using Api.Database; |
| | | 11 | | using Api.Database.Utils; |
| | | 12 | | using Geralt; |
| | | 13 | | using Microsoft.AspNetCore.Authentication; |
| | | 14 | | using Microsoft.EntityFrameworkCore; |
| | | 15 | | using Microsoft.Extensions.Options; |
| | | 16 | | |
| | | 17 | | namespace Api.Auth.Handlers; |
| | | 18 | | |
| | | 19 | | class AuthHandler( |
| | | 20 | | IOptionsMonitor<AuthenticationSchemeOptions> options, |
| | | 21 | | ILoggerFactory logger, |
| | | 22 | | UrlEncoder encoder, |
| | | 23 | | PGContext db |
| | | 24 | | ) : AuthenticationHandler<AuthenticationSchemeOptions>(options, logger, encoder) |
| | | 25 | | { |
| | | 26 | | protected override async Task<AuthenticateResult> HandleAuthenticateAsync() |
| | | 27 | | { |
| | | 28 | | string?[] tokens = |
| | | 29 | | [ |
| | | 30 | | Context.Request.Headers.Authorization.FirstOrDefault(), |
| | | 31 | | Context.Request.Cookies[AuthUtils.TokenCookieName], |
| | | 32 | | ]; |
| | | 33 | | var tokenHash = SelectToken(tokens); |
| | | 34 | | |
| | | 35 | | if (tokenHash is null) |
| | | 36 | | { |
| | | 37 | | return AuthenticateResult.NoResult(); |
| | | 38 | | } |
| | | 39 | | |
| | | 40 | | var identity = await ( |
| | | 41 | | tokenHash.Prefix switch |
| | | 42 | | { |
| | | 43 | | AuthUtils.UserTokenPrefixName => GetUserIdentityAsync( |
| | | 44 | | tokenHash.TokenHash |
| | | 45 | | ), |
| | | 46 | | |
| | | 47 | | AuthUtils.RemoteServiceTokenPrefixName => GetServiceIdentity( |
| | | 48 | | tokenHash.TokenHash, |
| | | 49 | | Context |
| | | 50 | | .Request.Headers[RemoteServiceToken.ServiceImpersonatedUserHeader] |
| | | 51 | | .FirstOrDefault() |
| | | 52 | | ?.TryParseGuid() |
| | | 53 | | ), |
| | | 54 | | _ => Task.FromResult<ClaimsIdentity?>(null), |
| | | 55 | | } |
| | | 56 | | ); |
| | | 57 | | |
| | | 58 | | if (identity is not null) |
| | | 59 | | { |
| | | 60 | | return AuthenticateResult.Success( |
| | | 61 | | new AuthenticationTicket( |
| | | 62 | | new ClaimsPrincipal(new ClaimsPrincipal(identity)), |
| | | 63 | | Scheme.Name |
| | | 64 | | ) |
| | | 65 | | ); |
| | | 66 | | } |
| | | 67 | | |
| | | 68 | | return AuthenticateResult.NoResult(); |
| | | 69 | | } |
| | | 70 | | |
| | 1 | 71 | | private record Token(byte[] TokenHash, string Prefix); |
| | | 72 | | |
| | | 73 | | private static Token? SelectToken(string?[] tokens) |
| | | 74 | | { |
| | | 75 | | var tokenHashes = tokens |
| | | 76 | | .Where(s => |
| | | 77 | | s != null && AuthUtils.TokenPrefixesNames.Any(p => s.StartsWith(p)) |
| | | 78 | | ) |
| | | 79 | | .Select(s => |
| | | 80 | | { |
| | | 81 | | if (s is null) |
| | | 82 | | { |
| | | 83 | | return null; |
| | | 84 | | } |
| | | 85 | | var prefix = s.Split(AuthUtils.PrefixSeparator).First(); |
| | | 86 | | var apiToken = Base64Url.DecodeFromChars( |
| | | 87 | | s.AsSpan()[(prefix.Length + 1)..] |
| | | 88 | | ); |
| | | 89 | | |
| | | 90 | | var tokenHash = new byte[32]; |
| | | 91 | | BLAKE2b.ComputeHash(tokenHash, apiToken); |
| | | 92 | | return new Token(tokenHash, prefix); |
| | | 93 | | }) |
| | | 94 | | .Where(t => t is not null) |
| | | 95 | | .ToArray(); |
| | | 96 | | |
| | | 97 | | return tokenHashes.Length == 0 ? null : tokenHashes.First(); |
| | | 98 | | } |
| | | 99 | | |
| | | 100 | | private async Task<ClaimsIdentity?> GetUserIdentityAsync(byte[] tokenHash) |
| | | 101 | | { |
| | | 102 | | var userToken = await db |
| | | 103 | | .UserTokens.Where(ut => tokenHash.SequenceEqual(ut.TokenHash)) |
| | | 104 | | .FirstOrDefaultAsync(); |
| | | 105 | | |
| | | 106 | | if (userToken is null) |
| | | 107 | | { |
| | | 108 | | return null; |
| | | 109 | | } |
| | | 110 | | userToken = AuthUtils.UpdateLastUsedTokens(userToken); |
| | | 111 | | |
| | | 112 | | await db.SaveChangesAsync(); |
| | | 113 | | |
| | | 114 | | Claim[] claims = |
| | | 115 | | [ |
| | | 116 | | new Claim(ClaimTypes.NameIdentifier, userToken.UserId.ToString()), |
| | | 117 | | new Claim( |
| | | 118 | | UserTokenEF.PermissionBitsType, |
| | | 119 | | ((long)userToken.Permissions).ToString() |
| | | 120 | | ), |
| | | 121 | | ]; |
| | | 122 | | return new ClaimsIdentity(claims, "user_token"); |
| | | 123 | | } |
| | | 124 | | |
| | | 125 | | private async Task<ClaimsIdentity?> GetServiceIdentity( |
| | | 126 | | byte[] tokenHash, |
| | | 127 | | Guid? targetUser |
| | | 128 | | ) |
| | | 129 | | { |
| | | 130 | | var serviceToken = await db |
| | | 131 | | .RemoteServiceTokens.Where(t => t.TokenHash.SequenceEqual(tokenHash)) |
| | | 132 | | .Include(t => t.RemoteService) |
| | | 133 | | .ThenInclude(t => t.UserPermissions.Where(u => u.UserId == targetUser)) |
| | | 134 | | .FirstOrDefaultAsync(); |
| | | 135 | | |
| | | 136 | | var userPermission = serviceToken?.RemoteService.UserPermissions.FirstOrDefault(); |
| | | 137 | | |
| | | 138 | | if (serviceToken is null) |
| | | 139 | | { |
| | | 140 | | return null; |
| | | 141 | | } |
| | | 142 | | |
| | | 143 | | AuthUtils.UpdateLastUsedTokens(serviceToken); |
| | | 144 | | |
| | | 145 | | if (userPermission is not null) |
| | | 146 | | { |
| | | 147 | | AuthUtils.UpdateLastUsedTokens(userPermission); |
| | | 148 | | } |
| | | 149 | | |
| | | 150 | | await db.SaveChangesAsync(); |
| | | 151 | | |
| | | 152 | | List<Claim> claims = |
| | | 153 | | [ |
| | | 154 | | new Claim( |
| | | 155 | | RemoteServiceToken.ServiceIdentifierType, |
| | | 156 | | serviceToken.RemoteServiceId.ToString() |
| | | 157 | | ), |
| | | 158 | | ]; |
| | | 159 | | if (serviceToken.RemoteService.AllowedJobs.Count != 0) |
| | | 160 | | { |
| | | 161 | | claims.Add( |
| | | 162 | | new Claim( |
| | | 163 | | RemoteServiceToken.ServiceAllowedJobsType, |
| | | 164 | | serviceToken.RemoteService.AllowedJobs.Aggregate( |
| | | 165 | | (s1, s2) => $"{s1},{s2}" |
| | | 166 | | ) |
| | | 167 | | ) |
| | | 168 | | ); |
| | | 169 | | } |
| | | 170 | | if (userPermission is not null) |
| | | 171 | | { |
| | | 172 | | claims.AddRange([ |
| | | 173 | | new Claim(ClaimTypes.NameIdentifier, userPermission.UserId.ToString()), |
| | | 174 | | new Claim( |
| | | 175 | | UserTokenEF.PermissionBitsType, |
| | | 176 | | ((long)userPermission.Permissions).ToString() |
| | | 177 | | ), |
| | | 178 | | ]); |
| | | 179 | | } |
| | | 180 | | |
| | | 181 | | return new ClaimsIdentity(claims, "service_token"); |
| | | 182 | | } |
| | | 183 | | } |