5079590438

Committed 25 May 2023 12:28PM UTC coverage: 92.228% (+0.5%) from 91.723%

Build # 5079590438

Build Type

Pull #3502

github

Pull Request Pull Request #3502: Apply clang-format to the codebase

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95.29

/src/lib/tls/msg_cert_verify.cpp

/*
* Certificate Verify Message
* (C) 2004,2006,2011,2012 Jack Lloyd
*     2017 Harry Reimann, Rohde & Schwarz Cybersecurity
*     2021 Elektrobit Automotive GmbH
*     2022 René Meusel, Hannes Rantzsch - neXenio GmbH
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/tls_messages.h>

#include <botan/credentials_manager.h>
#include <botan/pk_keys.h>
#include <botan/tls_algos.h>
#include <botan/tls_extensions.h>
#include <botan/internal/stl_util.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/tls_handshake_state.h>
#include <botan/internal/tls_reader.h>

namespace Botan::TLS {

/*
* Create a new Certificate Verify message for TLS 1.2
*/
Certificate_Verify_12::Certificate_Verify_12(Handshake_IO& io,
                                             Handshake_State& state,
                                             const Policy& policy,
                                             RandomNumberGenerator& rng,
                                             const Private_Key* priv_key) {
   BOTAN_ASSERT_NONNULL(priv_key);

   std::pair<std::string, Signature_Format> format = state.choose_sig_format(*priv_key, m_scheme, true, policy);

   m_signature =
      state.callbacks().tls_sign_message(*priv_key, rng, format.first, format.second, state.hash().get_contents());

   state.hash().update(io.send(*this));
}

/*
* Deserialize a Certificate Verify message
*/
Certificate_Verify::Certificate_Verify(const std::vector<uint8_t>& buf) {
   TLS_Data_Reader reader("CertificateVerify", buf);

   m_scheme = Signature_Scheme(reader.get_uint16_t());
   m_signature = reader.get_range<uint8_t>(2, 0, 65535);
   reader.assert_done();

   if(!m_scheme.is_set()) {
      throw Decoding_Error("Counterparty did not send hash/sig IDS");
   }
}

/*
* Serialize a Certificate Verify message
*/
std::vector<uint8_t> Certificate_Verify::serialize() const {
   BOTAN_ASSERT_NOMSG(m_scheme.is_set());
   std::vector<uint8_t> buf;
   buf.reserve(2 + 2 + m_signature.size());  // work around GCC warning

   const auto code = m_scheme.wire_code();
   buf.push_back(get_byte<0>(code));
   buf.push_back(get_byte<1>(code));

   if(m_signature.size() > 0xFFFF) {
      throw Encoding_Error("Certificate_Verify signature too long to encode");
   }

   const uint16_t sig_len = static_cast<uint16_t>(m_signature.size());
   buf.push_back(get_byte<0>(sig_len));
   buf.push_back(get_byte<1>(sig_len));
   buf += m_signature;

   return buf;
}

bool Certificate_Verify_12::verify(const X509_Certificate& cert,
                                   const Handshake_State& state,
                                   const Policy& policy) const {
   auto key = cert.subject_public_key();

   policy.check_peer_key_acceptable(*key);

   std::pair<std::string, Signature_Format> format =
      state.parse_sig_format(*key, m_scheme, state.client_hello()->signature_schemes(), true, policy);

   const bool signature_valid =
      state.callbacks().tls_verify_message(*key, format.first, format.second, state.hash().get_contents(), m_signature);

#if defined(BOTAN_UNSAFE_FUZZER_MODE)
   BOTAN_UNUSED(signature_valid);
   return true;

#else
   return signature_valid;

#endif
}

#if defined(BOTAN_HAS_TLS_13)

namespace {

std::vector<uint8_t> message(Connection_Side side, const Transcript_Hash& hash) {
   std::vector<uint8_t> msg(64, 0x20);
   msg.reserve(64 + 33 + 1 + hash.size());

   const std::string context_string = (side == TLS::Connection_Side::Server) ? "TLS 1.3, server CertificateVerify"
                                                                             : "TLS 1.3, client CertificateVerify";

   msg.insert(msg.end(), context_string.cbegin(), context_string.cend());
   msg.push_back(0x00);

   msg.insert(msg.end(), hash.cbegin(), hash.cend());
   return msg;
}

Signature_Scheme choose_signature_scheme(const Private_Key& key,
                                         const std::vector<Signature_Scheme>& allowed_schemes,
                                         const std::vector<Signature_Scheme>& peer_allowed_schemes) {
   for(Signature_Scheme scheme : allowed_schemes) {
      if(scheme.is_available() && scheme.is_suitable_for(key) && value_exists(peer_allowed_schemes, scheme)) {
         return scheme;
      }
   }

   throw TLS_Exception(Alert::HandshakeFailure, "Failed to agree on a signature algorithm");
}

}

/*
* Create a new Certificate Verify message for TLS 1.3
*/
Certificate_Verify_13::Certificate_Verify_13(const Certificate_13& certificate_msg,
                                             const std::vector<Signature_Scheme>& peer_allowed_schemes,
                                             std::string_view hostname,
                                             const Transcript_Hash& hash,
                                             Connection_Side whoami,
                                             Credentials_Manager& creds_mgr,
                                             const Policy& policy,
                                             Callbacks& callbacks,
                                             RandomNumberGenerator& rng) :
      m_side(whoami) {
   BOTAN_ASSERT_NOMSG(!certificate_msg.empty());

   const auto private_key = creds_mgr.private_key_for(
      certificate_msg.leaf(), m_side == Connection_Side::Client ? "tls-client" : "tls-server", std::string(hostname));

   if(!private_key) {
      throw TLS_Exception(Alert::InternalError, "Application did not provide a private key for its certificate");
   }

   m_scheme = choose_signature_scheme(*private_key, policy.allowed_signature_schemes(), peer_allowed_schemes);
   BOTAN_ASSERT_NOMSG(m_scheme.is_available());
   BOTAN_ASSERT_NOMSG(m_scheme.is_compatible_with(Protocol_Version::TLS_V13));

   m_signature = callbacks.tls_sign_message(
      *private_key, rng, m_scheme.padding_string(), m_scheme.format().value(), message(m_side, hash));
}

Certificate_Verify_13::Certificate_Verify_13(const std::vector<uint8_t>& buf, const Connection_Side side) :
      Certificate_Verify(buf), m_side(side) {
   if(!m_scheme.is_available()) {
      throw TLS_Exception(Alert::HandshakeFailure, "Peer sent unknown signature scheme");
   }

   if(!m_scheme.is_compatible_with(Protocol_Version::TLS_V13)) {
      throw TLS_Exception(Alert::IllegalParameter, "Peer sent signature algorithm that is not suitable for TLS 1.3");
   }
}

/*
* Verify a Certificate Verify message
*/
bool Certificate_Verify_13::verify(const X509_Certificate& cert,
                                   Callbacks& callbacks,
                                   const Transcript_Hash& transcript_hash) const {
   BOTAN_ASSERT_NOMSG(m_scheme.is_available());

   // RFC 8446 4.2.3
   //    The keys found in certificates MUST [...] be of appropriate type for
   //    the signature algorithms they are used with.
   if(m_scheme.key_algorithm_identifier() != cert.subject_public_key_algo()) {
      throw TLS_Exception(Alert::IllegalParameter, "Signature algorithm does not match certificate's public key");
   }

   const auto key = cert.subject_public_key();
   const bool signature_valid = callbacks.tls_verify_message(
      *key, m_scheme.padding_string(), m_scheme.format().value(), message(m_side, transcript_hash), m_signature);

   #if defined(BOTAN_UNSAFE_FUZZER_MODE)
   BOTAN_UNUSED(signature_valid);
   return true;
   #else
   return signature_valid;
   #endif
}

#endif  // BOTAN_HAS_TLS_13

}

1	/*
2	* Certificate Verify Message
3	* (C) 2004,2006,2011,2012 Jack Lloyd
4	* 2017 Harry Reimann, Rohde & Schwarz Cybersecurity
5	* 2021 Elektrobit Automotive GmbH
6	* 2022 René Meusel, Hannes Rantzsch - neXenio GmbH
7	*
8	* Botan is released under the Simplified BSD License (see license.txt)
9	*/
10
11	#include <botan/tls_messages.h>
12
13	#include <botan/credentials_manager.h>
14	#include <botan/pk_keys.h>
15	#include <botan/tls_algos.h>
16	#include <botan/tls_extensions.h>
17	#include <botan/internal/stl_util.h>
18	#include <botan/internal/tls_handshake_io.h>
19	#include <botan/internal/tls_handshake_state.h>
20	#include <botan/internal/tls_reader.h>
21
22	namespace Botan::TLS {
23
24	/*
25	* Create a new Certificate Verify message for TLS 1.2
26	*/
27	Certificate_Verify_12::Certificate_Verify_12(Handshake_IO& io,	80✔
28	Handshake_State& state,
29	const Policy& policy,
30	RandomNumberGenerator& rng,
31	const Private_Key* priv_key) {	80✔
32	BOTAN_ASSERT_NONNULL(priv_key);	80✔
33
34	std::pair<std::string, Signature_Format> format = state.choose_sig_format(*priv_key, m_scheme, true, policy);	80✔
35
36	m_signature =	79✔
37	state.callbacks().tls_sign_message(*priv_key, rng, format.first, format.second, state.hash().get_contents());	79✔
38
39	state.hash().update(io.send(*this));	237✔
40	}	80✔
41
42	/*
43	* Deserialize a Certificate Verify message
44	*/
45	Certificate_Verify::Certificate_Verify(const std::vector<uint8_t>& buf) {	482✔
46	TLS_Data_Reader reader("CertificateVerify", buf);	482✔
47
48	m_scheme = Signature_Scheme(reader.get_uint16_t());	482✔
49	m_signature = reader.get_range<uint8_t>(2, 0, 65535);	481✔
50	reader.assert_done();	480✔
51
52	if(!m_scheme.is_set()) {	476✔
53	throw Decoding_Error("Counterparty did not send hash/sig IDS");	×
54	}
55	}	482✔
56
57	/*
58	* Serialize a Certificate Verify message
59	*/
60	std::vector<uint8_t> Certificate_Verify::serialize() const {	369✔
61	BOTAN_ASSERT_NOMSG(m_scheme.is_set());	369✔
62	std::vector<uint8_t> buf;	369✔
63	buf.reserve(2 + 2 + m_signature.size()); // work around GCC warning	369✔
64
65	const auto code = m_scheme.wire_code();	369✔
66	buf.push_back(get_byte<0>(code));	369✔
67	buf.push_back(get_byte<1>(code));	369✔
68
69	if(m_signature.size() > 0xFFFF) {	369✔
70	throw Encoding_Error("Certificate_Verify signature too long to encode");	×
71	}
72
73	const uint16_t sig_len = static_cast<uint16_t>(m_signature.size());	369✔
74	buf.push_back(get_byte<0>(sig_len));	369✔
75	buf.push_back(get_byte<1>(sig_len));	369✔
76	buf += m_signature;	369✔
77
78	return buf;	369✔
79	}	×
80
81	bool Certificate_Verify_12::verify(const X509_Certificate& cert,	128✔
82	const Handshake_State& state,
83	const Policy& policy) const {
84	auto key = cert.subject_public_key();	128✔
85
86	policy.check_peer_key_acceptable(*key);	128✔
87
88	std::pair<std::string, Signature_Format> format =	128✔
89	state.parse_sig_format(*key, m_scheme, state.client_hello()->signature_schemes(), true, policy);	130✔
90
91	const bool signature_valid =	126✔
92	state.callbacks().tls_verify_message(*key, format.first, format.second, state.hash().get_contents(), m_signature);	126✔
93
94	#if defined(BOTAN_UNSAFE_FUZZER_MODE)
95	BOTAN_UNUSED(signature_valid);
96	return true;
97
98	#else
99	return signature_valid;	126✔
100
101	#endif
102	}	252✔
103
104	#if defined(BOTAN_HAS_TLS_13)
105
106	namespace {
107
108	std::vector<uint8_t> message(Connection_Side side, const Transcript_Hash& hash) {	590✔
109	std::vector<uint8_t> msg(64, 0x20);	590✔
110	msg.reserve(64 + 33 + 1 + hash.size());	590✔
111
112	const std::string context_string = (side == TLS::Connection_Side::Server) ? "TLS 1.3, server CertificateVerify"	590✔
113	: "TLS 1.3, client CertificateVerify";	675✔
114
115	msg.insert(msg.end(), context_string.cbegin(), context_string.cend());	590✔
116	msg.push_back(0x00);	590✔
117
118	msg.insert(msg.end(), hash.cbegin(), hash.cend());	590✔
119	return msg;	590✔
120	}	590✔
121
122	Signature_Scheme choose_signature_scheme(const Private_Key& key,	284✔
123	const std::vector<Signature_Scheme>& allowed_schemes,
124	const std::vector<Signature_Scheme>& peer_allowed_schemes) {
125	for(Signature_Scheme scheme : allowed_schemes) {	721✔
126	if(scheme.is_available() && scheme.is_suitable_for(key) && value_exists(peer_allowed_schemes, scheme)) {	1,233✔
127	return scheme;	281✔
128	}
129	}
130
131	throw TLS_Exception(Alert::HandshakeFailure, "Failed to agree on a signature algorithm");	3✔
132	}
133
134	}
135
136	/*
137	* Create a new Certificate Verify message for TLS 1.3
138	*/
139	Certificate_Verify_13::Certificate_Verify_13(const Certificate_13& certificate_msg,	284✔
140	const std::vector<Signature_Scheme>& peer_allowed_schemes,
141	std::string_view hostname,
142	const Transcript_Hash& hash,
143	Connection_Side whoami,
144	Credentials_Manager& creds_mgr,
145	const Policy& policy,
146	Callbacks& callbacks,
147	RandomNumberGenerator& rng) :	284✔
148	m_side(whoami) {	284✔
149	BOTAN_ASSERT_NOMSG(!certificate_msg.empty());	284✔
150
151	const auto private_key = creds_mgr.private_key_for(	284✔
152	certificate_msg.leaf(), m_side == Connection_Side::Client ? "tls-client" : "tls-server", std::string(hostname));	1,098✔
153
154	if(!private_key) {	284✔
155	throw TLS_Exception(Alert::InternalError, "Application did not provide a private key for its certificate");	×
156	}
157
158	m_scheme = choose_signature_scheme(*private_key, policy.allowed_signature_schemes(), peer_allowed_schemes);	287✔
159	BOTAN_ASSERT_NOMSG(m_scheme.is_available());	281✔
160	BOTAN_ASSERT_NOMSG(m_scheme.is_compatible_with(Protocol_Version::TLS_V13));	281✔
161
162	m_signature = callbacks.tls_sign_message(	561✔
163	*private_key, rng, m_scheme.padding_string(), m_scheme.format().value(), message(m_side, hash));	846✔
164	}	284✔
165
166	Certificate_Verify_13::Certificate_Verify_13(const std::vector<uint8_t>& buf, const Connection_Side side) :	347✔
167	Certificate_Verify(buf), m_side(side) {	347✔
168	if(!m_scheme.is_available()) {	345✔
169	throw TLS_Exception(Alert::HandshakeFailure, "Peer sent unknown signature scheme");	10✔
170	}
171
172	if(!m_scheme.is_compatible_with(Protocol_Version::TLS_V13)) {	335✔
173	throw TLS_Exception(Alert::IllegalParameter, "Peer sent signature algorithm that is not suitable for TLS 1.3");	12✔
174	}
175	}	345✔
176
177	/*
178	* Verify a Certificate Verify message
179	*/
180	bool Certificate_Verify_13::verify(const X509_Certificate& cert,	316✔
181	Callbacks& callbacks,
182	const Transcript_Hash& transcript_hash) const {
183	BOTAN_ASSERT_NOMSG(m_scheme.is_available());	316✔
184
185	// RFC 8446 4.2.3
186	// The keys found in certificates MUST [...] be of appropriate type for
187	// the signature algorithms they are used with.
188	if(m_scheme.key_algorithm_identifier() != cert.subject_public_key_algo()) {	316✔
189	throw TLS_Exception(Alert::IllegalParameter, "Signature algorithm does not match certificate's public key");	7✔
190	}
191
192	const auto key = cert.subject_public_key();	309✔
193	const bool signature_valid = callbacks.tls_verify_message(	309✔
194	*key, m_scheme.padding_string(), m_scheme.format().value(), message(m_side, transcript_hash), m_signature);	618✔
195
196	#if defined(BOTAN_UNSAFE_FUZZER_MODE)
197	BOTAN_UNUSED(signature_valid);
198	return true;
199	#else
200	return signature_valid;	309✔
201	#endif
202	}	309✔
203
204	#endif // BOTAN_HAS_TLS_13
205
206	}

randombit / botan / 5079590438

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