This repository has been archived by the owner on Dec 14, 2017. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 149
/
ScopeRequirementMiddleware.cs
140 lines (121 loc) · 4.74 KB
/
ScopeRequirementMiddleware.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/*
* Copyright 2015 Dominick Baier, Brock Allen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using Microsoft.Owin;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;
using AppFunc = System.Func<System.Collections.Generic.IDictionary<string, object>, System.Threading.Tasks.Task>;
namespace IdentityServer3.AccessTokenValidation
{
/// <summary>
/// Middleware to check for scope claims in access token
/// </summary>
public class ScopeRequirementMiddleware
{
private readonly AppFunc _next;
private readonly ScopeRequirementOptions _options;
/// <summary>
/// Initializes a new instance of the <see cref="ScopeRequirementMiddleware"/> class.
/// </summary>
/// <param name="next">The next midleware.</param>
/// <param name="options">The options.</param>
public ScopeRequirementMiddleware(AppFunc next, ScopeRequirementOptions options)
{
_next = next;
_options = options;
}
/// <summary>
/// Invokes the middleware.
/// </summary>
/// <param name="env">The OWIN environment.</param>
/// <returns></returns>
public async Task Invoke(IDictionary<string, object> env)
{
var context = new OwinContext(env);
// if no token was sent - no need to validate scopes
ClaimsPrincipal principal = null;
if (!string.IsNullOrWhiteSpace(_options.AuthenticationType))
{
var result = await context.Authentication.AuthenticateAsync(_options.AuthenticationType);
if (result != null && result.Identity != null)
{
principal = new ClaimsPrincipal(result.Identity);
}
}
else
{
principal = context.Authentication.User;
}
if (principal == null || principal.Identity == null || !principal.Identity.IsAuthenticated)
{
await _next(env);
return;
}
if (ScopesFound(context))
{
await _next(env);
return;
}
context.Response.StatusCode = 403;
context.Response.Headers.Add("WWW-Authenticate", new[] { "Bearer error=\"insufficient_scope\"" });
EmitCorsResponseHeaders(env);
}
private void EmitCorsResponseHeaders(IDictionary<string, object> env)
{
var ctx = new OwinContext(env);
var responseHeaders = ctx.Response.Headers;
string[] values;
if (ctx.Request.Headers.TryGetValue("Origin", out values))
{
SetHeaderIfNotAlreadyPresent(responseHeaders, "Access-Control-Allow-Origin", values);
SetHeaderIfNotAlreadyPresent(responseHeaders, "Access-Control-Expose-Headers", new string[] { "WWW-Authenticate" });
}
if (ctx.Request.Headers.TryGetValue("Access-Control-Request-Method", out values))
{
SetHeaderIfNotAlreadyPresent(responseHeaders, "Access-Control-Allow-Method", values);
}
if (ctx.Request.Headers.TryGetValue("Access-Control-Request-Headers", out values))
{
SetHeaderIfNotAlreadyPresent(responseHeaders, "Access-Control-Allow-Headers", values);
}
}
private bool ScopesFound(OwinContext context)
{
var scopeClaims = context.Authentication.User.FindAll("scope");
if (scopeClaims == null || !scopeClaims.Any())
{
return false;
}
foreach (var scope in scopeClaims)
{
if (_options.RequiredScopes.Contains(scope.Value, StringComparer.Ordinal))
{
return true;
}
}
return false;
}
private static void SetHeaderIfNotAlreadyPresent(IHeaderDictionary headers, string headerName, string[] headerValues)
{
if (!headers.ContainsKey(headerName))
{
headers.Add(headerName, headerValues);
}
}
}
}