1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_SSL_SSL_CONFIG_H_ 6 #define NET_SSL_SSL_CONFIG_H_ 7 8 #include "base/basictypes.h" 9 #include "base/memory/ref_counted.h" 10 #include "net/base/net_export.h" 11 #include "net/cert/x509_certificate.h" 12 13 namespace net { 14 15 // Various TLS/SSL ProtocolVersion values encoded as uint16 16 // struct { 17 // uint8 major; 18 // uint8 minor; 19 // } ProtocolVersion; 20 // The most significant byte is |major|, and the least significant byte 21 // is |minor|. 22 enum { 23 SSL_PROTOCOL_VERSION_SSL3 = 0x0300, 24 SSL_PROTOCOL_VERSION_TLS1 = 0x0301, 25 SSL_PROTOCOL_VERSION_TLS1_1 = 0x0302, 26 SSL_PROTOCOL_VERSION_TLS1_2 = 0x0303, 27 }; 28 29 // Default minimum protocol version. 30 NET_EXPORT extern const uint16 kDefaultSSLVersionMin; 31 32 // Default maximum protocol version. 33 NET_EXPORT extern const uint16 kDefaultSSLVersionMax; 34 35 // A collection of SSL-related configuration settings. 36 struct NET_EXPORT SSLConfig { 37 // Default to revocation checking. 38 // Default to SSL 3.0 ~ default_version_max() on. 39 SSLConfig(); 40 ~SSLConfig(); 41 42 // Returns true if |cert| is one of the certs in |allowed_bad_certs|. 43 // The expected cert status is written to |cert_status|. |*cert_status| can 44 // be NULL if user doesn't care about the cert status. 45 bool IsAllowedBadCert(X509Certificate* cert, CertStatus* cert_status) const; 46 47 // Same as above except works with DER encoded certificates instead 48 // of X509Certificate. 49 bool IsAllowedBadCert(const base::StringPiece& der_cert, 50 CertStatus* cert_status) const; 51 52 // rev_checking_enabled is true if online certificate revocation checking is 53 // enabled (i.e. OCSP and CRL fetching). 54 // 55 // Regardless of this flag, CRLSet checking is always enabled and locally 56 // cached revocation information will be considered. 57 bool rev_checking_enabled; 58 59 // rev_checking_required_local_anchors is true if revocation checking is 60 // required to succeed when certificates chain to local trust anchors (that 61 // is, non-public CAs). If revocation information cannot be obtained, such 62 // certificates will be treated as revoked ("hard-fail"). 63 // Note: This is distinct from rev_checking_enabled. If true, it is 64 // equivalent to also setting rev_checking_enabled, but only when the 65 // certificate chain chains to a local (non-public) trust anchor. 66 bool rev_checking_required_local_anchors; 67 68 // The minimum and maximum protocol versions that are enabled. 69 // SSL 3.0 is 0x0300, TLS 1.0 is 0x0301, TLS 1.1 is 0x0302, and so on. 70 // (Use the SSL_PROTOCOL_VERSION_xxx enumerators defined above.) 71 // SSL 2.0 is not supported. If version_max < version_min, it means no 72 // protocol versions are enabled. 73 uint16 version_min; 74 uint16 version_max; 75 76 // Presorted list of cipher suites which should be explicitly prevented from 77 // being used in addition to those disabled by the net built-in policy. 78 // 79 // By default, all cipher suites supported by the underlying SSL 80 // implementation will be enabled except for: 81 // - Null encryption cipher suites. 82 // - Weak cipher suites: < 80 bits of security strength. 83 // - FORTEZZA cipher suites (obsolete). 84 // - IDEA cipher suites (RFC 5469 explains why). 85 // - Anonymous cipher suites. 86 // - ECDSA cipher suites on platforms that do not support ECDSA signed 87 // certificates, as servers may use the presence of such ciphersuites as a 88 // hint to send an ECDSA certificate. 89 // The ciphers listed in |disabled_cipher_suites| will be removed in addition 90 // to the above list. 91 // 92 // Though cipher suites are sent in TLS as "uint8 CipherSuite[2]", in 93 // big-endian form, they should be declared in host byte order, with the 94 // first uint8 occupying the most significant byte. 95 // Ex: To disable TLS_RSA_WITH_RC4_128_MD5, specify 0x0004, while to 96 // disable TLS_ECDH_ECDSA_WITH_RC4_128_SHA, specify 0xC002. 97 std::vector<uint16> disabled_cipher_suites; 98 99 bool channel_id_enabled; // True if TLS channel ID extension is enabled. 100 bool false_start_enabled; // True if we'll use TLS False Start. 101 // True if the Certificate Transparency signed_certificate_timestamp 102 // TLS extension is enabled. 103 bool signed_cert_timestamps_enabled; 104 105 // require_forward_secrecy, if true, causes only (EC)DHE cipher suites to be 106 // enabled. NOTE: this only applies to server sockets currently, although 107 // that could be extended if needed. 108 bool require_forward_secrecy; 109 110 // TODO(wtc): move the following members to a new SSLParams structure. They 111 // are not SSL configuration settings. 112 113 struct NET_EXPORT CertAndStatus { 114 CertAndStatus(); 115 ~CertAndStatus(); 116 117 std::string der_cert; 118 CertStatus cert_status; 119 }; 120 121 // Add any known-bad SSL certificate (with its cert status) to 122 // |allowed_bad_certs| that should not trigger an ERR_CERT_* error when 123 // calling SSLClientSocket::Connect. This would normally be done in 124 // response to the user explicitly accepting the bad certificate. 125 std::vector<CertAndStatus> allowed_bad_certs; 126 127 // True if we should send client_cert to the server. 128 bool send_client_cert; 129 130 bool verify_ev_cert; // True if we should verify the certificate for EV. 131 132 bool version_fallback; // True if we are falling back to an older protocol 133 // version (one still needs to decrement 134 // version_max). 135 136 // If cert_io_enabled is false, then certificate verification will not 137 // result in additional HTTP requests. (For example: to fetch missing 138 // intermediates or to perform OCSP/CRL fetches.) It also implies that online 139 // revocation checking is disabled. 140 // NOTE: Only used by NSS. 141 bool cert_io_enabled; 142 143 // The list of application level protocols supported. If set, this will 144 // enable Next Protocol Negotiation (if supported). The order of the 145 // protocols doesn't matter expect for one case: if the server supports Next 146 // Protocol Negotiation, but there is no overlap between the server's and 147 // client's protocol sets, then the first protocol in this list will be 148 // requested by the client. 149 std::vector<std::string> next_protos; 150 151 scoped_refptr<X509Certificate> client_cert; 152 }; 153 154 } // namespace net 155 156 #endif // NET_SSL_SSL_CONFIG_H_ 157