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
|
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_SSL_CONFIG_SERVICE_H_
#define NET_BASE_SSL_CONFIG_SERVICE_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "net/base/x509_certificate.h"
namespace net {
// A collection of SSL-related configuration settings.
struct SSLConfig {
// Default to revocation checking.
// Default to SSL 3.0 on and TLS 1.0 on.
SSLConfig();
~SSLConfig();
// Returns true if |cert| is one of the certs in |allowed_bad_certs|.
bool IsAllowedBadCert(X509Certificate* cert) const;
bool rev_checking_enabled; // True if server certificate revocation
// checking is enabled.
// SSL 2.0 is not supported.
bool ssl3_enabled; // True if SSL 3.0 is enabled.
bool tls1_enabled; // True if TLS 1.0 is enabled.
bool dnssec_enabled; // True if we'll accept DNSSEC chains in certificates.
// True if we'll do async checks for certificate provenance using DNS.
bool dns_cert_provenance_checking_enabled;
// Cipher suites which should be explicitly prevented from being used in
// addition to those disabled by the net built-in policy -- by default, all
// cipher suites supported by the underlying SSL implementation will be
// enabled except for:
// - Null encryption cipher suites.
// - Weak cipher suites: < 80 bits of security strength.
// - FORTEZZA cipher suites (obsolete).
// - IDEA cipher suites (RFC 5469 explains why).
// - Anonymous cipher suites.
// The ciphers listed in |disabled_cipher_suites| will be removed in addition
// to the above statically defined disable list.
//
// Though cipher suites are sent in TLS as "uint8 CipherSuite[2]", in
// big-endian form, they should be declared in host byte order, with the
// first uint8 occupying the most significant byte.
// Ex: To disable TLS_RSA_WITH_RC4_128_MD5, specify 0x0004, while to
// disable TLS_ECDH_ECDSA_WITH_RC4_128_SHA, specify 0xC002.
//
// TODO(rsleevi): Not implemented when using Schannel.
std::vector<uint16> disabled_cipher_suites;
bool false_start_enabled; // True if we'll use TLS False Start.
// TODO(wtc): move the following members to a new SSLParams structure. They
// are not SSL configuration settings.
struct CertAndStatus {
CertAndStatus();
~CertAndStatus();
scoped_refptr<X509Certificate> cert;
int cert_status;
};
// Add any known-bad SSL certificate (with its cert status) to
// |allowed_bad_certs| that should not trigger an ERR_CERT_* error when
// calling SSLClientSocket::Connect. This would normally be done in
// response to the user explicitly accepting the bad certificate.
std::vector<CertAndStatus> allowed_bad_certs;
// True if we should send client_cert to the server.
bool send_client_cert;
bool verify_ev_cert; // True if we should verify the certificate for EV.
bool ssl3_fallback; // True if we are falling back to SSL 3.0 (one still
// needs to clear tls1_enabled).
// The list of application level protocols supported. If set, this will
// enable Next Protocol Negotiation (if supported). This is a list of 8-bit
// length prefixed strings. The order of the protocols doesn't matter expect
// for one case: if the server supports Next Protocol Negotiation, but there
// is no overlap between the server's and client's protocol sets, then the
// first protocol in this list will be requested by the client.
std::string next_protos;
scoped_refptr<X509Certificate> client_cert;
};
// The interface for retrieving the SSL configuration. This interface
// does not cover setting the SSL configuration, as on some systems, the
// SSLConfigService objects may not have direct access to the configuration, or
// live longer than the configuration preferences.
class SSLConfigService : public base::RefCountedThreadSafe<SSLConfigService> {
public:
// Observer is notified when SSL config settings have changed.
class Observer {
public:
// Notify observers if SSL settings have changed. We don't check all of the
// data in SSLConfig, just those that qualify as a user config change.
// The following settings are considered user changes:
// rev_checking_enabled
// ssl3_enabled
// tls1_enabled
virtual void OnSSLConfigChanged() = 0;
protected:
virtual ~Observer() {}
};
SSLConfigService();
// Create an instance of SSLConfigService which retrieves the configuration
// from the system SSL configuration, or an instance of
// SSLConfigServiceDefaults if the current system does not have a system SSL
// configuration. Note: this does not handle SSLConfigService implementations
// that are not native to their platform, such as preference-backed ones.
static SSLConfigService* CreateSystemSSLConfigService();
// May not be thread-safe, should only be called on the IO thread.
virtual void GetSSLConfig(SSLConfig* config) = 0;
// Returns true if the given hostname is known to be incompatible with TLS
// False Start.
static bool IsKnownFalseStartIncompatibleServer(const std::string& hostname);
// Enables the acceptance of self-signed certificates which contain an
// embedded DNSSEC chain proving their validity.
static void EnableDNSSEC();
static bool dnssec_enabled();
// Disables False Start in SSL connections.
static void DisableFalseStart();
// True if we use False Start for SSL and TLS.
static bool false_start_enabled();
// Enables DNS side checks for certificates.
static void EnableDNSCertProvenanceChecking();
static bool dns_cert_provenance_checking_enabled();
// Add an observer of this service.
void AddObserver(Observer* observer);
// Remove an observer of this service.
void RemoveObserver(Observer* observer);
protected:
friend class base::RefCountedThreadSafe<SSLConfigService>;
virtual ~SSLConfigService();
// SetFlags sets the values of several flags based on global configuration.
static void SetSSLConfigFlags(SSLConfig* ssl_config);
// Process before/after config update.
void ProcessConfigUpdate(const SSLConfig& orig_config,
const SSLConfig& new_config);
private:
ObserverList<Observer> observer_list_;
};
} // namespace net
#endif // NET_BASE_SSL_CONFIG_SERVICE_H_
|
