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83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_SSL_SSL_CIPHER_SUITE_NAMES_H_
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#define NET_SSL_SSL_CIPHER_SUITE_NAMES_H_
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#include <stdint.h>
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#include <string>
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#include "net/base/net_export.h"
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namespace net {
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// SSLCipherSuiteToStrings returns three strings for a given cipher suite
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// number, the name of the key exchange algorithm, the name of the cipher and
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// the name of the MAC. The cipher suite number is the number as sent on the
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// wire and recorded at
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// http://www.iana.org/assignments/tls-parameters/tls-parameters.xml
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// If the cipher suite is unknown, the strings are set to "???".
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// In the case of an AEAD cipher suite, *mac_str is nullptr and *is_aead is
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// true.
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// In the case of a TLS 1.3 AEAD-only cipher suite, *key_exchange_str is nullptr
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// and *is_tls13 is true.
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NET_EXPORT void SSLCipherSuiteToStrings(const char** key_exchange_str,
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const char** cipher_str,
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const char** mac_str,
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bool* is_aead,
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bool* is_tls13,
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uint16_t cipher_suite);
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// SSLVersionToString returns the name of the SSL protocol version
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// specified by |ssl_version|, which is defined in
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// net/ssl/ssl_connection_status_flags.h.
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// If the version is unknown, |name| is set to "???".
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NET_EXPORT void SSLVersionToString(const char** name, int ssl_version);
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// Parses a string literal that represents a SSL/TLS cipher suite.
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//
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// Supported literal forms:
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// 0xAABB, where AA is cipher_suite[0] and BB is cipher_suite[1], as
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// defined in RFC 2246, Section 7.4.1.2. Unrecognized but parsable cipher
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// suites in this form will not return an error.
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//
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// Returns true if the cipher suite was successfully parsed, storing the
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// result in |cipher_suite|.
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//
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// TODO(rsleevi): Support the full strings defined in the IANA TLS parameters
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// list.
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NET_EXPORT bool ParseSSLCipherString(const std::string& cipher_string,
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uint16_t* cipher_suite);
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// Mask definitions for an integer that holds obsolete SSL setting details.
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enum ObsoleteSSLMask {
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OBSOLETE_SSL_NONE = 0, // Modern SSL
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OBSOLETE_SSL_MASK_PROTOCOL = 1 << 0,
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OBSOLETE_SSL_MASK_KEY_EXCHANGE = 1 << 1,
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OBSOLETE_SSL_MASK_CIPHER = 1 << 2,
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};
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// Takes the given |connection_status| and returns a bitmask indicating which of
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// the protocol, key exchange, and cipher suite do not meet modern best-practice
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// security standards (when backwards compatibility can be ignored) - that is,
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// which ones are "obsolete".
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//
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// Currently, this function uses the following criteria to determine what is
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// obsolete:
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//
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// - Protocol: less than TLS 1.2
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// - Key exchange: Does not use ECDHE-based key exchanges authenticated by a
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// certificate
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// - Cipher: not an AEAD cipher
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NET_EXPORT int ObsoleteSSLStatus(int connection_status);
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// Returns true if |cipher_suite| is suitable for use with HTTP/2. See
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// https://http2.github.io/http2-spec/#rfc.section.9.2.2.
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NET_EXPORT bool IsTLSCipherSuiteAllowedByHTTP2(uint16_t cipher_suite);
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} // namespace net
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#endif // NET_SSL_SSL_CIPHER_SUITE_NAMES_H_
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