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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
# frozen_string_literal: true
require "spec_helper"
require "erb"
class Message < ERB
include SecureHeaders::ViewHelpers
def self.template
<<-TEMPLATE
<% hashed_javascript_tag(raise_error_on_unrecognized_hash = true) do %>
console.log(1)
<% end %>
<% hashed_style_tag do %>
body {
background-color: black;
}
<% end %>
<% nonced_javascript_tag do %>
body {
console.log(1)
}
<% end %>
<% nonced_style_tag do %>
body {
background-color: black;
}
<% end %>
<script nonce="<%= content_security_policy_script_nonce %>">
alert(1)
</script>
<style nonce="<%= content_security_policy_style_nonce %>">
body {
background-color: black;
}
</style>
<%= nonced_javascript_include_tag "include.js", defer: true %>
<%= nonced_javascript_pack_tag "pack.js", "otherpack.js", defer: true %>
<%= nonced_stylesheet_link_tag "link.css", media: :all %>
<%= nonced_stylesheet_pack_tag "pack.css", "otherpack.css", media: :all %>
TEMPLATE
end
def initialize(request, options = {})
@virtual_path = "/asdfs/index"
@_request = request
@template = self.class.template
super(@template)
end
def capture(*args)
yield(*args)
end
def content_tag(type, content = nil, options = nil, &block)
content =
if block_given?
capture(block)
end
if options.is_a?(Hash)
options = options.map { |k, v| " #{k}=#{v}" }
end
"<#{type}#{options}>#{content}</#{type}>"
end
def javascript_include_tag(*sources, **options)
sources.map do |source|
content_tag(:script, nil, options.merge(src: source))
end
end
alias_method :javascript_pack_tag, :javascript_include_tag
def stylesheet_link_tag(*sources, **options)
sources.map do |source|
content_tag(:link, nil, options.merge(href: source, rel: "stylesheet", media: "screen"))
end
end
alias_method :stylesheet_pack_tag, :stylesheet_link_tag
def result
super(binding)
end
def request
@_request
end
end
class MessageWithConflictingMethod < Message
def content_security_policy_nonce
"rails-nonce"
end
end
module SecureHeaders
describe ViewHelpers do
let(:app) { lambda { |env| [200, env, "app"] } }
let(:middleware) { Middleware.new(app) }
let(:request) { Rack::Request.new("HTTP_USER_AGENT" => USER_AGENTS[:chrome]) }
let(:filename) { "app/views/asdfs/index.html.erb" }
before(:all) do
reset_config
Configuration.default do |config|
config.csp = {
default_src: %w('self'),
script_src: %w('self'),
style_src: %w('self')
}
end
end
after(:each) do
Configuration.instance_variable_set(:@script_hashes, nil)
Configuration.instance_variable_set(:@style_hashes, nil)
end
it "raises an error when using hashed content without precomputed hashes" do
expect {
Message.new(request).result
}.to raise_error(ViewHelpers::UnexpectedHashedScriptException)
end
it "raises an error when using hashed content with precomputed hashes, but none for the given file" do
Configuration.instance_variable_set(:@script_hashes, filename.reverse => ["'sha256-123'"])
expect {
Message.new(request).result
}.to raise_error(ViewHelpers::UnexpectedHashedScriptException)
end
it "raises an error when using previously unknown hashed content with precomputed hashes for a given file" do
Configuration.instance_variable_set(:@script_hashes, filename => ["'sha256-123'"])
expect {
Message.new(request).result
}.to raise_error(ViewHelpers::UnexpectedHashedScriptException)
end
it "adds known hash values to the corresponding headers when the helper is used" do
begin
allow(SecureRandom).to receive(:base64).and_return("abc123")
expected_hash = "sha256-3/URElR9+3lvLIouavYD/vhoICSNKilh15CzI/nKqg8="
Configuration.instance_variable_set(:@script_hashes, filename => ["'#{expected_hash}'"])
expected_style_hash = "sha256-7oYK96jHg36D6BM042er4OfBnyUDTG3pH1L8Zso3aGc="
Configuration.instance_variable_set(:@style_hashes, filename => ["'#{expected_style_hash}'"])
# render erb that calls out to helpers.
Message.new(request).result
_, env = middleware.call request.env
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/script-src[^;]*'#{Regexp.escape(expected_hash)}'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/script-src[^;]*'nonce-abc123'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/style-src[^;]*'nonce-abc123'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/style-src[^;]*'#{Regexp.escape(expected_style_hash)}'/)
end
end
it "avoids calling content_security_policy_nonce internally" do
begin
allow(SecureRandom).to receive(:base64).and_return("abc123")
expected_hash = "sha256-3/URElR9+3lvLIouavYD/vhoICSNKilh15CzI/nKqg8="
Configuration.instance_variable_set(:@script_hashes, filename => ["'#{expected_hash}'"])
expected_style_hash = "sha256-7oYK96jHg36D6BM042er4OfBnyUDTG3pH1L8Zso3aGc="
Configuration.instance_variable_set(:@style_hashes, filename => ["'#{expected_style_hash}'"])
# render erb that calls out to helpers.
MessageWithConflictingMethod.new(request).result
_, env = middleware.call request.env
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/script-src[^;]*'#{Regexp.escape(expected_hash)}'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/script-src[^;]*'nonce-abc123'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/style-src[^;]*'nonce-abc123'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).to match(/style-src[^;]*'#{Regexp.escape(expected_style_hash)}'/)
expect(env[ContentSecurityPolicyConfig::HEADER_NAME]).not_to match(/rails-nonce/)
end
end
end
end
|
