11087146043

Committed 28 Sep 2024 09:28PM UTC coverage: 92.003% (+0.7%) from 91.274%

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/src/lib/tls/tls13/msg_certificate_req_13.cpp

/*
* (C) 2022 Jack Lloyd
* (C) 2022 Hannes Rantzsch, René Meusel - 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/tls_callbacks.h>
#include <botan/tls_exceptn.h>
#include <botan/internal/tls_reader.h>

namespace Botan::TLS {

Handshake_Type Certificate_Request_13::type() const {
   return TLS::Handshake_Type::CertificateRequest;
}

Certificate_Request_13::Certificate_Request_13(const std::vector<uint8_t>& buf, const Connection_Side side) {
   TLS_Data_Reader reader("Certificate_Request_13", buf);

   // RFC 8446 4.3.2
   //    A server which is authenticating with a certificate MAY optionally
   //    request a certificate from the client.
   if(side != Connection_Side::Server) {
      throw TLS_Exception(Alert::UnexpectedMessage, "Received a Certificate_Request message from a client");
   }

   m_context = reader.get_tls_length_value(1);
   m_extensions.deserialize(reader, side, type());

   // RFC 8446 4.3.2
   //    The "signature_algorithms" extension MUST be specified, and other
   //    extensions may optionally be included if defined for this message.
   //    Clients MUST ignore unrecognized extensions.

   if(!m_extensions.has<Signature_Algorithms>()) {
      throw TLS_Exception(Alert::MissingExtension,
                          "Certificate_Request message did not provide a signature_algorithms extension");
   }

   // RFC 8446 4.2.
   //    The table below indicates the messages where a given extension may
   //    appear [...].  If an implementation receives an extension which it
   //    recognizes and which is not specified for the message in which it
   //    appears, it MUST abort the handshake with an "illegal_parameter" alert.
   //
   // For Certificate Request said table states:
   //    "status_request", "signature_algorithms", "signed_certificate_timestamp",
   //     "certificate_authorities", "oid_filters", "signature_algorithms_cert",
   std::set<Extension_Code> allowed_extensions = {
      Extension_Code::CertificateStatusRequest,
      Extension_Code::SignatureAlgorithms,
      // Extension_Code::SignedCertificateTimestamp,  // NYI
      Extension_Code::CertificateAuthorities,
      // Extension_Code::OidFilters,                   // NYI
      Extension_Code::CertSignatureAlgorithms,
   };

   if(m_extensions.contains_implemented_extensions_other_than(allowed_extensions)) {
      throw TLS_Exception(Alert::IllegalParameter, "Certificate Request contained an extension that is not allowed");
   }
}

Certificate_Request_13::Certificate_Request_13(std::vector<X509_DN> acceptable_CAs, const Policy& policy, Callbacks&) {
   // RFC 8446 4.3.2
   //    The certificate_request_context [here: m_context] MUST be unique within
   //    the scope of this connection (thus preventing replay of client
   //    CertificateVerify messages).  This field SHALL be zero length unless
   //    used for the post-handshake authentication exchanges described in
   //    Section 4.6.2.
   //
   // TODO: Post-Handshake auth must fill m_context in an unpredictable way

   // RFC 8446 4.3.2
   //    [Supported signature algorithms are] expressed by sending the
   //    "signature_algorithms" and optionally "signature_algorithms_cert"
   //    extensions. [A list of certificate authorities which the server would
   //    accept] is expressed by sending the "certificate_authorities" extension.
   //
   //    The "signature_algorithms" extension MUST be specified, and other
   //    extensions may optionally be included if defined for this message.
   m_extensions.add(std::make_unique<Signature_Algorithms>(policy.acceptable_signature_schemes()));
   if(auto cert_signing_prefs = policy.acceptable_certificate_signature_schemes()) {
      // RFC 8446 4.2.3
      //    Implementations which have the same policy in both cases MAY omit
      //    the "signature_algorithms_cert" extension.
      m_extensions.add(std::make_unique<Signature_Algorithms_Cert>(std::move(cert_signing_prefs.value())));
   }

   if(!acceptable_CAs.empty()) {
      m_extensions.add(std::make_unique<Certificate_Authorities>(std::move(acceptable_CAs)));
   }

   // TODO: Support cert_status_request for OCSP stapling

   // TODO: give the application a chance to modifying extensions
   //       (after GH #2988 is merged)
   // callbacks.tls_modify_extensions(m_extensions, Connection_Side::Server);
}

std::optional<Certificate_Request_13> Certificate_Request_13::maybe_create(const Client_Hello_13& client_hello,
                                                                           Credentials_Manager& cred_mgr,
                                                                           Callbacks& callbacks,
                                                                           const Policy& policy) {
   const auto trusted_CAs = cred_mgr.trusted_certificate_authorities("tls-server", client_hello.sni_hostname());

   std::vector<X509_DN> client_auth_CAs;
   for(const auto store : trusted_CAs) {
      const auto subjects = store->all_subjects();
      client_auth_CAs.insert(client_auth_CAs.end(), subjects.begin(), subjects.end());
   }

   if(client_auth_CAs.empty() && !policy.request_client_certificate_authentication()) {
      return std::nullopt;
   }

   return Certificate_Request_13(std::move(client_auth_CAs), policy, callbacks);
}

std::vector<X509_DN> Certificate_Request_13::acceptable_CAs() const {
   if(m_extensions.has<Certificate_Authorities>()) {
      return m_extensions.get<Certificate_Authorities>()->distinguished_names();
   }
   return {};
}

const std::vector<Signature_Scheme>& Certificate_Request_13::signature_schemes() const {
   // RFC 8446 4.3.2
   //    The "signature_algorithms" extension MUST be specified
   BOTAN_ASSERT_NOMSG(m_extensions.has<Signature_Algorithms>());

   return m_extensions.get<Signature_Algorithms>()->supported_schemes();
}

const std::vector<Signature_Scheme>& Certificate_Request_13::certificate_signature_schemes() const {
   // RFC 8446 4.2.3
   //   If no "signature_algorithms_cert" extension is present, then the
   //   "signature_algorithms" extension also applies to signatures appearing
   //   in certificates.
   if(auto sig_schemes_cert = m_extensions.get<Signature_Algorithms_Cert>()) {
      return sig_schemes_cert->supported_schemes();
   } else {
      return signature_schemes();
   }
}

std::vector<uint8_t> Certificate_Request_13::serialize() const {
   std::vector<uint8_t> buf;
   append_tls_length_value(buf, m_context, 1);
   buf += m_extensions.serialize(Connection_Side::Server);
   return buf;
}

}  // namespace Botan::TLS

1	/*
2	* (C) 2022 Jack Lloyd
3	* (C) 2022 Hannes Rantzsch, René Meusel - neXenio GmbH
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/tls_messages.h>
9
10	#include <botan/credentials_manager.h>
11	#include <botan/tls_callbacks.h>
12	#include <botan/tls_exceptn.h>
13	#include <botan/internal/tls_reader.h>
14
15	namespace Botan::TLS {
16
17	Handshake_Type Certificate_Request_13::type() const {	376✔
18	return TLS::Handshake_Type::CertificateRequest;	376✔
19	}
20
21	Certificate_Request_13::Certificate_Request_13(const std::vector<uint8_t>& buf, const Connection_Side side) {	60✔
22	TLS_Data_Reader reader("Certificate_Request_13", buf);	60✔
23
24	// RFC 8446 4.3.2
25	// A server which is authenticating with a certificate MAY optionally
26	// request a certificate from the client.
27	if(side != Connection_Side::Server) {
28	throw TLS_Exception(Alert::UnexpectedMessage, "Received a Certificate_Request message from a client");	×
29	}
30
31	m_context = reader.get_tls_length_value(1);	120✔
32	m_extensions.deserialize(reader, side, type());	60✔
33
34	// RFC 8446 4.3.2
35	// The "signature_algorithms" extension MUST be specified, and other
36	// extensions may optionally be included if defined for this message.
37	// Clients MUST ignore unrecognized extensions.
38
39	if(!m_extensions.has<Signature_Algorithms>()) {	58✔
40	throw TLS_Exception(Alert::MissingExtension,	1✔
41	"Certificate_Request message did not provide a signature_algorithms extension");	2✔
42	}
43
44	// RFC 8446 4.2.
45	// The table below indicates the messages where a given extension may
46	// appear [...]. If an implementation receives an extension which it
47	// recognizes and which is not specified for the message in which it
48	// appears, it MUST abort the handshake with an "illegal_parameter" alert.
49	//
50	// For Certificate Request said table states:
51	// "status_request", "signature_algorithms", "signed_certificate_timestamp",
52	// "certificate_authorities", "oid_filters", "signature_algorithms_cert",
53	std::set<Extension_Code> allowed_extensions = {	57✔
54	Extension_Code::CertificateStatusRequest,
55	Extension_Code::SignatureAlgorithms,
56	// Extension_Code::SignedCertificateTimestamp, // NYI
57	Extension_Code::CertificateAuthorities,
58	// Extension_Code::OidFilters, // NYI
59	Extension_Code::CertSignatureAlgorithms,
60	};	57✔
61
62	if(m_extensions.contains_implemented_extensions_other_than(allowed_extensions)) {	57✔
63	throw TLS_Exception(Alert::IllegalParameter, "Certificate Request contained an extension that is not allowed");	×
64	}
65	}	60✔
66
67	Certificate_Request_13::Certificate_Request_13(std::vector<X509_DN> acceptable_CAs, const Policy& policy, Callbacks&) {	101✔
68	// RFC 8446 4.3.2
69	// The certificate_request_context [here: m_context] MUST be unique within
70	// the scope of this connection (thus preventing replay of client
71	// CertificateVerify messages). This field SHALL be zero length unless
72	// used for the post-handshake authentication exchanges described in
73	// Section 4.6.2.
74	//
75	// TODO: Post-Handshake auth must fill m_context in an unpredictable way
76
77	// RFC 8446 4.3.2
78	// [Supported signature algorithms are] expressed by sending the
79	// "signature_algorithms" and optionally "signature_algorithms_cert"
80	// extensions. [A list of certificate authorities which the server would
81	// accept] is expressed by sending the "certificate_authorities" extension.
82	//
83	// The "signature_algorithms" extension MUST be specified, and other
84	// extensions may optionally be included if defined for this message.
85	m_extensions.add(std::make_unique<Signature_Algorithms>(policy.acceptable_signature_schemes()));	202✔
86	if(auto cert_signing_prefs = policy.acceptable_certificate_signature_schemes()) {	101✔
87	// RFC 8446 4.2.3
88	// Implementations which have the same policy in both cases MAY omit
89	// the "signature_algorithms_cert" extension.
90	m_extensions.add(std::make_unique<Signature_Algorithms_Cert>(std::move(cert_signing_prefs.value())));	×
91	}	×
92
93	if(!acceptable_CAs.empty()) {	101✔
94	m_extensions.add(std::make_unique<Certificate_Authorities>(std::move(acceptable_CAs)));	×
95	}
96
97	// TODO: Support cert_status_request for OCSP stapling
98
99	// TODO: give the application a chance to modifying extensions
100	// (after GH #2988 is merged)
101	// callbacks.tls_modify_extensions(m_extensions, Connection_Side::Server);
102	}	101✔
103
104	std::optional<Certificate_Request_13> Certificate_Request_13::maybe_create(const Client_Hello_13& client_hello,	267✔
105	Credentials_Manager& cred_mgr,
106	Callbacks& callbacks,
107	const Policy& policy) {
108	const auto trusted_CAs = cred_mgr.trusted_certificate_authorities("tls-server", client_hello.sni_hostname());	534✔
109
110	std::vector<X509_DN> client_auth_CAs;	267✔
111	for(const auto store : trusted_CAs) {	267✔
112	const auto subjects = store->all_subjects();	×
113	client_auth_CAs.insert(client_auth_CAs.end(), subjects.begin(), subjects.end());	×
114	}	×
115
116	if(client_auth_CAs.empty() && !policy.request_client_certificate_authentication()) {	267✔
117	return std::nullopt;	166✔
118	}
119
120	return Certificate_Request_13(std::move(client_auth_CAs), policy, callbacks);	101✔
121	}	267✔
122
123	std::vector<X509_DN> Certificate_Request_13::acceptable_CAs() const {	48✔
124	if(m_extensions.has<Certificate_Authorities>()) {	48✔
125	return m_extensions.get<Certificate_Authorities>()->distinguished_names();	3✔
126	}
127	return {};	45✔
128	}
129
130	const std::vector<Signature_Scheme>& Certificate_Request_13::signature_schemes() const {	194✔
131	// RFC 8446 4.3.2
132	// The "signature_algorithms" extension MUST be specified
133	BOTAN_ASSERT_NOMSG(m_extensions.has<Signature_Algorithms>());	194✔
134
135	return m_extensions.get<Signature_Algorithms>()->supported_schemes();	194✔
136	}
137
138	const std::vector<Signature_Scheme>& Certificate_Request_13::certificate_signature_schemes() const {	48✔
139	// RFC 8446 4.2.3
140	// If no "signature_algorithms_cert" extension is present, then the
141	// "signature_algorithms" extension also applies to signatures appearing
142	// in certificates.
143	if(auto sig_schemes_cert = m_extensions.get<Signature_Algorithms_Cert>()) {	48✔
144	return sig_schemes_cert->supported_schemes();	×
145	} else {
146	return signature_schemes();	48✔
147	}
148	}
149
150	std::vector<uint8_t> Certificate_Request_13::serialize() const {	105✔
151	std::vector<uint8_t> buf;	105✔
152	append_tls_length_value(buf, m_context, 1);	105✔
153	buf += m_extensions.serialize(Connection_Side::Server);	105✔
154	return buf;	105✔
155	}	×
156
157	} // namespace Botan::TLS

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