Botan 2.19.1
Crypto and TLS for C&
Public Member Functions | List of all members
Botan::TLS::NSA_Suite_B_192 Class Reference

#include <tls_policy.h>

Inheritance diagram for Botan::TLS::NSA_Suite_B_192:
Botan::TLS::Policy

Public Member Functions

virtual bool abort_connection_on_undesired_renegotiation () const
 
virtual bool acceptable_ciphersuite (const Ciphersuite &suite) const
 
virtual bool acceptable_protocol_version (Protocol_Version version) const
 
virtual bool allow_client_initiated_renegotiation () const
 
bool allow_dtls10 () const override
 
bool allow_dtls12 () const override
 
virtual bool allow_dtls_epoch0_restart () const
 
virtual bool allow_insecure_renegotiation () const
 
virtual bool allow_resumption_for_renegotiation () const
 
virtual bool allow_server_initiated_renegotiation () const
 
bool allow_tls10 () const override
 
bool allow_tls11 () const override
 
bool allow_tls12 () const override
 
std::vector< std::string > allowed_ciphers () const override
 
std::vector< std::string > allowed_key_exchange_methods () const override
 
std::vector< std::string > allowed_macs () const override
 
bool allowed_signature_hash (const std::string &hash) const
 
std::vector< std::string > allowed_signature_hashes () const override
 
bool allowed_signature_method (const std::string &sig_method) const
 
std::vector< std::string > allowed_signature_methods () const override
 
virtual std::vector< Signature_Schemeallowed_signature_schemes () const
 
virtual void check_peer_key_acceptable (const Public_Key &public_key) const
 
virtual Group_Params choose_key_exchange_group (const std::vector< Group_Params > &peer_groups) const
 
virtual std::vector< uint16_t > ciphersuite_list (Protocol_Version version, bool have_srp) const
 
virtual Group_Params default_dh_group () const
 
virtual size_t dtls_default_mtu () const
 
virtual size_t dtls_initial_timeout () const
 
virtual size_t dtls_maximum_timeout () const
 
virtual bool hide_unknown_users () const
 
virtual bool include_time_in_hello_random () const
 
std::vector< Group_Paramskey_exchange_groups () const override
 
virtual Protocol_Version latest_supported_version (bool datagram) const
 
virtual size_t maximum_certificate_chain_size () const
 
virtual size_t minimum_dh_group_size () const
 
virtual size_t minimum_dsa_group_size () const
 
virtual size_t minimum_ecdh_group_size () const
 
virtual size_t minimum_ecdsa_group_size () const
 
virtual size_t minimum_rsa_bits () const
 
size_t minimum_signature_strength () const override
 
virtual bool negotiate_encrypt_then_mac () const
 
virtual bool only_resume_with_exact_version () const
 
virtual void print (std::ostream &o) const
 
virtual bool request_client_certificate_authentication () const
 
virtual bool require_cert_revocation_info () const
 
virtual bool require_client_certificate_authentication () const
 
virtual bool send_fallback_scsv (Protocol_Version version) const
 
virtual bool server_uses_own_ciphersuite_preferences () const
 
virtual uint32_t session_ticket_lifetime () const
 
virtual std::vector< uint16_t > srtp_profiles () const
 
virtual bool support_cert_status_message () const
 
std::string to_string () const
 
virtual bool use_ecc_point_compression () const
 

Detailed Description

NSA Suite B 192-bit security level (RFC 6460)

Definition at line 385 of file tls_policy.h.

Member Function Documentation

◆ abort_connection_on_undesired_renegotiation()

bool Botan::TLS::Policy::abort_connection_on_undesired_renegotiation ( ) const
virtualinherited

If true, a request to renegotiate will close the connection with a fatal alert. Otherwise, a warning alert is sent.

Definition at line 349 of file tls_policy.cpp.

349{ return false; }

◆ acceptable_ciphersuite()

bool Botan::TLS::Policy::acceptable_ciphersuite ( const Ciphersuite suite) const
virtualinherited

Allows policy to reject any ciphersuites which are undesirable for whatever reason without having to reimplement ciphersuite_list

Definition at line 326 of file tls_policy.cpp.

327 {
328 return value_exists(allowed_ciphers(), ciphersuite.cipher_algo()) &&
329 value_exists(allowed_macs(), ciphersuite.mac_algo());
330 }
virtual std::vector< std::string > allowed_macs() const
Definition: tls_policy.cpp:77
virtual std::vector< std::string > allowed_ciphers() const
Definition: tls_policy.cpp:42
bool value_exists(const std::vector< T > &vec, const T &val)
Definition: stl_util.h:86

References Botan::TLS::Policy::allowed_ciphers(), Botan::TLS::Policy::allowed_macs(), Botan::TLS::Ciphersuite::cipher_algo(), Botan::TLS::Ciphersuite::mac_algo(), and Botan::value_exists().

Referenced by Botan::TLS::Policy::ciphersuite_list().

◆ acceptable_protocol_version()

bool Botan::TLS::Policy::acceptable_protocol_version ( Protocol_Version  version) const
virtualinherited
Returns
true if and only if we are willing to accept this version Default accepts TLS v1.0 and later or DTLS v1.2 or later.

Definition at line 278 of file tls_policy.cpp.

279 {
280 if(version == Protocol_Version::TLS_V12 && allow_tls12())
281 return true;
282
283 if(version == Protocol_Version::DTLS_V12 && allow_dtls12())
284 return true;
285
286#if defined(BOTAN_HAS_TLS_V10)
287
288 if(version == Protocol_Version::TLS_V11 && allow_tls11())
289 return true;
290 if(version == Protocol_Version::TLS_V10 && allow_tls10())
291 return true;
292 if(version == Protocol_Version::DTLS_V10 && allow_dtls10())
293 return true;
294
295#endif
296
297 return false;
298 }
virtual bool allow_tls12() const
Definition: tls_policy.cpp:337
virtual bool allow_dtls10() const
Definition: tls_policy.cpp:338
virtual bool allow_tls10() const
Definition: tls_policy.cpp:335
virtual bool allow_tls11() const
Definition: tls_policy.cpp:336
virtual bool allow_dtls12() const
Definition: tls_policy.cpp:339

References Botan::TLS::Policy::allow_dtls10(), Botan::TLS::Policy::allow_dtls12(), Botan::TLS::Policy::allow_tls10(), Botan::TLS::Policy::allow_tls11(), Botan::TLS::Policy::allow_tls12(), Botan::TLS::Protocol_Version::DTLS_V10, Botan::TLS::Protocol_Version::DTLS_V12, Botan::TLS::Protocol_Version::TLS_V10, Botan::TLS::Protocol_Version::TLS_V11, and Botan::TLS::Protocol_Version::TLS_V12.

Referenced by Botan::TLS::Client_Hello::Client_Hello(), and Botan::TLS::Policy::latest_supported_version().

◆ allow_client_initiated_renegotiation()

bool Botan::TLS::Policy::allow_client_initiated_renegotiation ( ) const
virtualinherited

Consulted by server side. If true, allows clients to initiate a new handshake

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 332 of file tls_policy.cpp.

332{ return false; }

Referenced by Botan::TLS::Text_Policy::allow_client_initiated_renegotiation().

◆ allow_dtls10()

bool Botan::TLS::NSA_Suite_B_192::allow_dtls10 ( ) const
inlineoverridevirtual

Allow DTLS v1.0

Reimplemented from Botan::TLS::Policy.

Definition at line 411 of file tls_policy.h.

411{ return false; }

◆ allow_dtls12()

bool Botan::TLS::NSA_Suite_B_192::allow_dtls12 ( ) const
inlineoverridevirtual

Allow DTLS v1.2

Reimplemented from Botan::TLS::Policy.

Definition at line 412 of file tls_policy.h.

412{ return false; }

◆ allow_dtls_epoch0_restart()

bool Botan::TLS::Policy::allow_dtls_epoch0_restart ( ) const
virtualinherited

If true, then allow a DTLS client to restart a connection to the same server association as described in section 4.2.8 of the DTLS RFC

Definition at line 350 of file tls_policy.cpp.

350{ return false; }

Referenced by Botan::TLS::Channel::received_data().

◆ allow_insecure_renegotiation()

bool Botan::TLS::Policy::allow_insecure_renegotiation ( ) const
virtualinherited

Allow renegotiation even if the counterparty doesn't support the secure renegotiation extension.

Warning
Changing this to true exposes you to injected plaintext attacks. Read RFC 5746 for background.

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 334 of file tls_policy.cpp.

334{ return false; }

Referenced by Botan::TLS::Text_Policy::allow_insecure_renegotiation(), and Botan::TLS::Policy::print().

◆ allow_resumption_for_renegotiation()

bool Botan::TLS::Policy::allow_resumption_for_renegotiation ( ) const
virtualinherited

Definition at line 345 of file tls_policy.cpp.

345{ return true; }

Referenced by Botan::TLS::Channel::renegotiate().

◆ allow_server_initiated_renegotiation()

bool Botan::TLS::Policy::allow_server_initiated_renegotiation ( ) const
virtualinherited

Consulted by client side. If true, allows servers to initiate a new handshake

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 333 of file tls_policy.cpp.

333{ return false; }

Referenced by Botan::TLS::Text_Policy::allow_server_initiated_renegotiation(), and Botan::TLS::Policy::print().

◆ allow_tls10()

bool Botan::TLS::NSA_Suite_B_192::allow_tls10 ( ) const
inlineoverridevirtual

Allow TLS v1.0

Reimplemented from Botan::TLS::Policy.

Definition at line 408 of file tls_policy.h.

408{ return false; }

◆ allow_tls11()

bool Botan::TLS::NSA_Suite_B_192::allow_tls11 ( ) const
inlineoverridevirtual

Allow TLS v1.1

Reimplemented from Botan::TLS::Policy.

Definition at line 409 of file tls_policy.h.

409{ return false; }

◆ allow_tls12()

bool Botan::TLS::NSA_Suite_B_192::allow_tls12 ( ) const
inlineoverridevirtual

Allow TLS v1.2

Reimplemented from Botan::TLS::Policy.

Definition at line 410 of file tls_policy.h.

410{ return true; }

◆ allowed_ciphers()

std::vector< std::string > Botan::TLS::NSA_Suite_B_192::allowed_ciphers ( ) const
inlineoverridevirtual

Returns a list of ciphers we are willing to negotiate, in order of preference.

Reimplemented from Botan::TLS::Policy.

Definition at line 388 of file tls_policy.h.

389 { return std::vector<std::string>({"AES-256/GCM"}); }

◆ allowed_key_exchange_methods()

std::vector< std::string > Botan::TLS::NSA_Suite_B_192::allowed_key_exchange_methods ( ) const
inlineoverridevirtual

Returns a list of key exchange algorithms we are willing to use, in order of preference. Allowed values: DH, empty string (representing RSA using server certificate key)

Reimplemented from Botan::TLS::Policy.

Definition at line 397 of file tls_policy.h.

398 { return std::vector<std::string>({"ECDH"}); }

◆ allowed_macs()

std::vector< std::string > Botan::TLS::NSA_Suite_B_192::allowed_macs ( ) const
inlineoverridevirtual

Returns a list of MAC algorithms we are willing to use.

Reimplemented from Botan::TLS::Policy.

Definition at line 394 of file tls_policy.h.

395 { return std::vector<std::string>({"AEAD"}); }

◆ allowed_signature_hash()

bool Botan::TLS::Policy::allowed_signature_hash ( const std::string &  hash) const
inherited

Definition at line 122 of file tls_policy.cpp.

123 {
124 return value_exists(allowed_signature_hashes(), sig_hash);
125 }
virtual std::vector< std::string > allowed_signature_hashes() const
Definition: tls_policy.cpp:67

References Botan::TLS::Policy::allowed_signature_hashes(), and Botan::value_exists().

Referenced by Botan::TLS::Policy::allowed_signature_schemes(), and Botan::TLS::Handshake_State::choose_sig_format().

◆ allowed_signature_hashes()

std::vector< std::string > Botan::TLS::NSA_Suite_B_192::allowed_signature_hashes ( ) const
inlineoverridevirtual

Returns a list of hash algorithms we are willing to use for signatures, in order of preference.

Reimplemented from Botan::TLS::Policy.

Definition at line 391 of file tls_policy.h.

392 { return std::vector<std::string>({"SHA-384"}); }

◆ allowed_signature_method()

bool Botan::TLS::Policy::allowed_signature_method ( const std::string &  sig_method) const
inherited

Definition at line 117 of file tls_policy.cpp.

118 {
119 return value_exists(allowed_signature_methods(), sig_method);
120 }
virtual std::vector< std::string > allowed_signature_methods() const
Definition: tls_policy.cpp:106

References Botan::TLS::Policy::allowed_signature_methods(), and Botan::value_exists().

Referenced by Botan::TLS::Policy::allowed_signature_schemes(), and Botan::TLS::Handshake_State::parse_sig_format().

◆ allowed_signature_methods()

std::vector< std::string > Botan::TLS::NSA_Suite_B_192::allowed_signature_methods ( ) const
inlineoverridevirtual

Returns a list of signature algorithms we are willing to use, in order of preference. Allowed values RSA and DSA.

Reimplemented from Botan::TLS::Policy.

Definition at line 400 of file tls_policy.h.

401 { return std::vector<std::string>({"ECDSA"}); }

◆ allowed_signature_schemes()

std::vector< Signature_Scheme > Botan::TLS::Policy::allowed_signature_schemes ( ) const
virtualinherited

Definition at line 22 of file tls_policy.cpp.

23 {
24 std::vector<Signature_Scheme> schemes;
25
27 {
28 if(signature_scheme_is_known(scheme) == false)
29 continue;
30 const bool sig_allowed = allowed_signature_method(signature_algorithm_of_scheme(scheme));
31 const bool hash_allowed = allowed_signature_hash(hash_function_of_scheme(scheme));
32
33 if(sig_allowed && hash_allowed)
34 {
35 schemes.push_back(scheme);
36 }
37 }
38
39 return schemes;
40 }
bool allowed_signature_method(const std::string &sig_method) const
Definition: tls_policy.cpp:117
bool allowed_signature_hash(const std::string &hash) const
Definition: tls_policy.cpp:122
const std::vector< Signature_Scheme > & all_signature_schemes()
Definition: tls_algos.cpp:229
bool signature_scheme_is_known(Signature_Scheme scheme)
Definition: tls_algos.cpp:262
Signature_Scheme
Definition: tls_algos.h:86
std::string hash_function_of_scheme(Signature_Scheme scheme)
Definition: tls_algos.cpp:191
std::string signature_algorithm_of_scheme(Signature_Scheme scheme)
Definition: tls_algos.cpp:291

References Botan::TLS::all_signature_schemes(), Botan::TLS::Policy::allowed_signature_hash(), Botan::TLS::Policy::allowed_signature_method(), Botan::TLS::hash_function_of_scheme(), Botan::TLS::signature_algorithm_of_scheme(), and Botan::TLS::signature_scheme_is_known().

Referenced by Botan::TLS::Handshake_State::choose_sig_format(), and Botan::TLS::Client_Hello::Client_Hello().

◆ check_peer_key_acceptable()

void Botan::TLS::Policy::check_peer_key_acceptable ( const Public_Key public_key) const
virtualinherited

Throw an exception if you don't like the peer's key. Default impl checks the key size against minimum_rsa_bits, minimum_ecdsa_group_size, or minimum_ecdh_group_size depending on the key's type. Override if you'd like to perform some other kind of test on (or logging of) the peer's keys.

Definition at line 231 of file tls_policy.cpp.

232 {
233 const std::string algo_name = public_key.algo_name();
234
235 const size_t keylength = public_key.key_length();
236 size_t expected_keylength = 0;
237
238 if(algo_name == "RSA")
239 {
240 expected_keylength = minimum_rsa_bits();
241 }
242 else if(algo_name == "DH")
243 {
244 expected_keylength = minimum_dh_group_size();
245 }
246 else if(algo_name == "DSA")
247 {
248 expected_keylength = minimum_dsa_group_size();
249 }
250 else if(algo_name == "ECDH" || algo_name == "Curve25519")
251 {
252 expected_keylength = minimum_ecdh_group_size();
253 }
254 else if(algo_name == "ECDSA")
255 {
256 expected_keylength = minimum_ecdsa_group_size();
257 }
258 // else some other algo, so leave expected_keylength as zero and the check is a no-op
259
260 if(keylength < expected_keylength)
261 throw TLS_Exception(Alert::INSUFFICIENT_SECURITY,
262 "Peer sent " +
263 std::to_string(keylength) + " bit " + algo_name + " key"
264 ", policy requires at least " +
265 std::to_string(expected_keylength));
266 }
virtual size_t minimum_ecdh_group_size() const
Definition: tls_policy.cpp:197
virtual size_t minimum_rsa_bits() const
Definition: tls_policy.cpp:213
virtual size_t minimum_dsa_group_size() const
Definition: tls_policy.cpp:225
virtual size_t minimum_dh_group_size() const
Definition: tls_policy.cpp:186
virtual size_t minimum_ecdsa_group_size() const
Definition: tls_policy.cpp:191
std::string to_string(const BER_Object &obj)
Definition: asn1_obj.cpp:213

References Botan::Public_Key::algo_name(), Botan::TLS::Alert::INSUFFICIENT_SECURITY, Botan::Public_Key::key_length(), Botan::TLS::Policy::minimum_dh_group_size(), Botan::TLS::Policy::minimum_dsa_group_size(), Botan::TLS::Policy::minimum_ecdh_group_size(), Botan::TLS::Policy::minimum_ecdsa_group_size(), Botan::TLS::Policy::minimum_rsa_bits(), and Botan::ASN1::to_string().

Referenced by Botan::TLS::Callbacks::tls_dh_agree(), Botan::TLS::Callbacks::tls_ecdh_agree(), Botan::TLS::Server_Key_Exchange::verify(), and Botan::TLS::Certificate_Verify::verify().

◆ choose_key_exchange_group()

Group_Params Botan::TLS::Policy::choose_key_exchange_group ( const std::vector< Group_Params > &  peer_groups) const
virtualinherited

Select a key exchange group to use, from the list of groups sent by the peer. If none are acceptable, return Group_Params::NONE

Definition at line 132 of file tls_policy.cpp.

133 {
134 if(peer_groups.empty())
135 return Group_Params::NONE;
136
137 const std::vector<Group_Params> our_groups = key_exchange_groups();
138
139 for(auto g : our_groups)
140 {
141 if(value_exists(peer_groups, g))
142 return g;
143 }
144
145 return Group_Params::NONE;
146 }
virtual std::vector< Group_Params > key_exchange_groups() const
Definition: tls_policy.cpp:162

References Botan::TLS::Policy::key_exchange_groups(), Botan::TLS::NONE, and Botan::value_exists().

Referenced by Botan::TLS::Client_Key_Exchange::Client_Key_Exchange(), and Botan::TLS::Server_Key_Exchange::Server_Key_Exchange().

◆ ciphersuite_list()

std::vector< uint16_t > Botan::TLS::Policy::ciphersuite_list ( Protocol_Version  version,
bool  have_srp 
) const
virtualinherited

Return allowed ciphersuites, in order of preference

Definition at line 442 of file tls_policy.cpp.

444 {
445 const std::vector<std::string> ciphers = allowed_ciphers();
446 const std::vector<std::string> macs = allowed_macs();
447 const std::vector<std::string> kex = allowed_key_exchange_methods();
448 const std::vector<std::string> sigs = allowed_signature_methods();
449
450 std::vector<Ciphersuite> ciphersuites;
451
452 for(auto&& suite : Ciphersuite::all_known_ciphersuites())
453 {
454 // Can we use it?
455 if(!suite.valid())
456 continue;
457
458 // Can we use it in this version?
459 if(!suite.usable_in_version(version))
460 continue;
461
462 // Is it acceptable to the policy?
463 if(!this->acceptable_ciphersuite(suite))
464 continue;
465
466 // Are we doing SRP?
467 if(!have_srp && suite.kex_method() == Kex_Algo::SRP_SHA)
468 continue;
469
470 if(!value_exists(kex, suite.kex_algo()))
471 continue; // unsupported key exchange
472
473 if(!value_exists(ciphers, suite.cipher_algo()))
474 continue; // unsupported cipher
475
476 if(!value_exists(macs, suite.mac_algo()))
477 continue; // unsupported MAC algo
478
479 if(!value_exists(sigs, suite.sig_algo()))
480 {
481 // allow if it's an empty sig algo and we want to use PSK
482 if(suite.auth_method() != Auth_Method::IMPLICIT || !suite.psk_ciphersuite())
483 continue;
484 }
485
486 /*
487 CECPQ1 always uses x25519 for ECDH, so treat the applications
488 removal of x25519 from the ECC curve list as equivalent to
489 saying they do not trust CECPQ1
490 */
491 if(suite.kex_method() == Kex_Algo::CECPQ1)
492 {
494 continue;
495 }
496
497 // OK, consider it
498 ciphersuites.push_back(suite);
499 }
500
501 if(ciphersuites.empty())
502 {
503 throw Invalid_State("Policy does not allow any available cipher suite");
504 }
505
506 Ciphersuite_Preference_Ordering order(ciphers, macs, kex, sigs);
507 std::sort(ciphersuites.begin(), ciphersuites.end(), order);
508
509 std::vector<uint16_t> ciphersuite_codes;
510 for(auto i : ciphersuites)
511 ciphersuite_codes.push_back(i.ciphersuite_code());
512 return ciphersuite_codes;
513 }
static const std::vector< Ciphersuite > & all_known_ciphersuites()
virtual bool acceptable_ciphersuite(const Ciphersuite &suite) const
Definition: tls_policy.cpp:326
virtual std::vector< std::string > allowed_key_exchange_methods() const
Definition: tls_policy.cpp:92

References Botan::TLS::Policy::acceptable_ciphersuite(), Botan::TLS::Ciphersuite::all_known_ciphersuites(), Botan::TLS::Policy::allowed_ciphers(), Botan::TLS::Policy::allowed_key_exchange_methods(), Botan::TLS::Policy::allowed_macs(), Botan::TLS::Policy::allowed_signature_methods(), Botan::TLS::CECPQ1, Botan::TLS::IMPLICIT, Botan::TLS::Policy::key_exchange_groups(), Botan::TLS::SRP_SHA, Botan::value_exists(), and Botan::TLS::X25519.

◆ default_dh_group()

Group_Params Botan::TLS::Policy::default_dh_group ( ) const
virtualinherited

Definition at line 148 of file tls_policy.cpp.

149 {
150 /*
151 * Return the first listed or just default to 2048
152 */
153 for(auto g : key_exchange_groups())
154 {
155 if(group_param_is_dh(g))
156 return g;
157 }
158
160 }
bool group_param_is_dh(Group_Params group)
Definition: tls_algos.cpp:118

References Botan::TLS::FFDHE_2048, Botan::TLS::group_param_is_dh(), and Botan::TLS::Policy::key_exchange_groups().

Referenced by Botan::TLS::Server_Key_Exchange::Server_Key_Exchange().

◆ dtls_default_mtu()

size_t Botan::TLS::Policy::dtls_default_mtu ( ) const
virtualinherited
Returns
the default MTU for DTLS

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 358 of file tls_policy.cpp.

359 {
360 // default MTU is IPv6 min MTU minus UDP/IP headers
361 return 1280 - 40 - 8;
362 }

Referenced by Botan::TLS::Channel::create_handshake_state(), and Botan::TLS::Text_Policy::dtls_default_mtu().

◆ dtls_initial_timeout()

size_t Botan::TLS::Policy::dtls_initial_timeout ( ) const
virtualinherited
Returns
the initial timeout for DTLS

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 355 of file tls_policy.cpp.

355{ return 1*1000; }

Referenced by Botan::TLS::Channel::create_handshake_state(), and Botan::TLS::Text_Policy::dtls_initial_timeout().

◆ dtls_maximum_timeout()

size_t Botan::TLS::Policy::dtls_maximum_timeout ( ) const
virtualinherited
Returns
the maximum timeout for DTLS

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 356 of file tls_policy.cpp.

356{ return 60*1000; }

Referenced by Botan::TLS::Channel::create_handshake_state(), and Botan::TLS::Text_Policy::dtls_maximum_timeout().

◆ hide_unknown_users()

bool Botan::TLS::Policy::hide_unknown_users ( ) const
virtualinherited

If this function returns false, unknown SRP/PSK identifiers will be rejected with an unknown_psk_identifier alert as soon as the non-existence is identified. Otherwise, a false identifier value will be used and the protocol allowed to proceed, causing the handshake to eventually fail without revealing that the username does not exist on this system.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 341 of file tls_policy.cpp.

341{ return false; }

Referenced by Botan::TLS::Client_Key_Exchange::Client_Key_Exchange(), Botan::TLS::Text_Policy::hide_unknown_users(), Botan::TLS::Policy::print(), and Botan::TLS::Server_Key_Exchange::Server_Key_Exchange().

◆ include_time_in_hello_random()

bool Botan::TLS::Policy::include_time_in_hello_random ( ) const
virtualinherited

The protocol dictates that the first 32 bits of the random field are the current time in seconds. However this allows client fingerprinting attacks. Set to false to disable, in which case random bytes will be used instead.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 340 of file tls_policy.cpp.

340{ return true; }

Referenced by Botan::TLS::Text_Policy::include_time_in_hello_random(), Botan::TLS::make_hello_random(), and Botan::TLS::Policy::print().

◆ key_exchange_groups()

std::vector< Group_Params > Botan::TLS::NSA_Suite_B_192::key_exchange_groups ( ) const
inlineoverridevirtual

Return list of ECC curves and FFDHE groups we are willing to use in order of preference.

Reimplemented from Botan::TLS::Policy.

Definition at line 403 of file tls_policy.h.

References Botan::TLS::SECP384R1.

◆ latest_supported_version()

Protocol_Version Botan::TLS::Policy::latest_supported_version ( bool  datagram) const
virtualinherited

Returns the more recent protocol version we are willing to use, for either TLS or DTLS depending on datagram param. Shouldn't ever need to override this unless you want to allow a user to disable use of TLS v1.2 (which is not recommended)

Definition at line 300 of file tls_policy.cpp.

301 {
302 if(datagram)
303 {
306#if defined(BOTAN_HAS_TLS_V10)
309#endif
310 throw Invalid_State("Policy forbids all available DTLS version");
311 }
312 else
313 {
316#if defined(BOTAN_HAS_TLS_V10)
321#endif
322 throw Invalid_State("Policy forbids all available TLS version");
323 }
324 }
virtual bool acceptable_protocol_version(Protocol_Version version) const
Definition: tls_policy.cpp:278

References Botan::TLS::Policy::acceptable_protocol_version(), Botan::TLS::Protocol_Version::DTLS_V10, Botan::TLS::Protocol_Version::DTLS_V12, Botan::TLS::Protocol_Version::TLS_V10, Botan::TLS::Protocol_Version::TLS_V11, and Botan::TLS::Protocol_Version::TLS_V12.

Referenced by Botan::TLS::Policy::send_fallback_scsv().

◆ maximum_certificate_chain_size()

size_t Botan::TLS::Policy::maximum_certificate_chain_size ( ) const
virtualinherited
Returns
the maximum size of the certificate chain, in bytes. Return 0 to disable this and accept any size.

Definition at line 352 of file tls_policy.cpp.

352{ return 0; }

Referenced by Botan::TLS::Certificate::Certificate().

◆ minimum_dh_group_size()

size_t Botan::TLS::Policy::minimum_dh_group_size ( ) const
virtualinherited

Return the minimum DH group size we're willing to use Default is currently 1024 (insecure), should be 2048

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 186 of file tls_policy.cpp.

187 {
188 return 2048;
189 }

Referenced by Botan::TLS::Policy::check_peer_key_acceptable(), Botan::TLS::Text_Policy::minimum_dh_group_size(), and Botan::TLS::Policy::print().

◆ minimum_dsa_group_size()

size_t Botan::TLS::Policy::minimum_dsa_group_size ( ) const
virtualinherited

Minimum DSA group size, default 2048 bits

Reimplemented in Botan::TLS::BSI_TR_02102_2.

Definition at line 225 of file tls_policy.cpp.

226 {
227 // FIPS 186-3
228 return 2048;
229 }

Referenced by Botan::TLS::Policy::check_peer_key_acceptable().

◆ minimum_ecdh_group_size()

size_t Botan::TLS::Policy::minimum_ecdh_group_size ( ) const
virtualinherited

Return the minimum ECDH group size we're willing to use for key exchange

Default 255, allowing x25519 and larger x25519 is the smallest curve we will negotiate P-521 is the largest

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 197 of file tls_policy.cpp.

198 {
199 // x25519 is smallest curve currently supported for TLS key exchange
200 return 255;
201 }

Referenced by Botan::TLS::Policy::check_peer_key_acceptable(), Botan::TLS::Text_Policy::minimum_ecdh_group_size(), and Botan::TLS::Policy::print().

◆ minimum_ecdsa_group_size()

size_t Botan::TLS::Policy::minimum_ecdsa_group_size ( ) const
virtualinherited

For ECDSA authenticated ciphersuites, the smallest key size the client will accept. This policy is currently only enforced on the server by the client.

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 191 of file tls_policy.cpp.

192 {
193 // Here we are at the mercy of whatever the CA signed, but most certs should be 256 bit by now
194 return 256;
195 }

Referenced by Botan::TLS::Policy::check_peer_key_acceptable(), and Botan::TLS::Text_Policy::minimum_ecdsa_group_size().

◆ minimum_rsa_bits()

size_t Botan::TLS::Policy::minimum_rsa_bits ( ) const
virtualinherited

Return the minimum bit size we're willing to accept for RSA key exchange or server signatures.

It does not place any requirements on the size of any RSA signature(s) which were used to check the server certificate. This is only concerned with the server's public key.

Default is 2048 which is smallest RSA key size still secure for medium term security.

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 213 of file tls_policy.cpp.

214 {
215 /* Default assumption is all end-entity certificates should
216 be at least 2048 bits these days.
217
218 If you are connecting to arbitrary servers on the Internet
219 (ie as a web browser or SMTP client) you'll probably have to reduce this
220 to 1024 bits, or perhaps even lower.
221 */
222 return 2048;
223 }

Referenced by Botan::TLS::Policy::check_peer_key_acceptable(), Botan::TLS::Text_Policy::minimum_rsa_bits(), and Botan::TLS::Policy::print().

◆ minimum_signature_strength()

size_t Botan::TLS::NSA_Suite_B_192::minimum_signature_strength ( ) const
inlineoverridevirtual

The minimum signature strength we will accept Returning 80 allows RSA 1024 and SHA-1. Values larger than 80 disable SHA-1 support. Returning 110 allows RSA 2048. Return 128 to force ECC (P-256) or large (~3000 bit) RSA keys. Default is 110

Reimplemented from Botan::TLS::Policy.

Definition at line 406 of file tls_policy.h.

406{ return 192; }

◆ negotiate_encrypt_then_mac()

bool Botan::TLS::Policy::negotiate_encrypt_then_mac ( ) const
virtualinherited

Indicates whether the encrypt-then-MAC extension should be negotiated (RFC 7366)

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 343 of file tls_policy.cpp.

343{ return true; }

Referenced by Botan::TLS::Client_Hello::Client_Hello(), Botan::TLS::Text_Policy::negotiate_encrypt_then_mac(), Botan::TLS::Policy::print(), and Botan::TLS::Server_Hello::Server_Hello().

◆ only_resume_with_exact_version()

bool Botan::TLS::Policy::only_resume_with_exact_version ( ) const
virtualinherited

Definition at line 346 of file tls_policy.cpp.

346{ return true; }

◆ print()

void Botan::TLS::Policy::print ( std::ostream &  o) const
virtualinherited

Convert this policy to a printable format.

Parameters
ostream to be printed to

Definition at line 553 of file tls_policy.cpp.

554 {
555 print_bool(o, "allow_tls10", allow_tls10());
556 print_bool(o, "allow_tls11", allow_tls11());
557 print_bool(o, "allow_tls12", allow_tls12());
558 print_bool(o, "allow_dtls10", allow_dtls10());
559 print_bool(o, "allow_dtls12", allow_dtls12());
560 print_vec(o, "ciphers", allowed_ciphers());
561 print_vec(o, "macs", allowed_macs());
562 print_vec(o, "signature_hashes", allowed_signature_hashes());
563 print_vec(o, "signature_methods", allowed_signature_methods());
564 print_vec(o, "key_exchange_methods", allowed_key_exchange_methods());
565 print_vec(o, "key_exchange_groups", key_exchange_groups());
566
567 print_bool(o, "allow_insecure_renegotiation", allow_insecure_renegotiation());
568 print_bool(o, "include_time_in_hello_random", include_time_in_hello_random());
569 print_bool(o, "allow_server_initiated_renegotiation", allow_server_initiated_renegotiation());
570 print_bool(o, "hide_unknown_users", hide_unknown_users());
571 print_bool(o, "server_uses_own_ciphersuite_preferences", server_uses_own_ciphersuite_preferences());
572 print_bool(o, "negotiate_encrypt_then_mac", negotiate_encrypt_then_mac());
573 print_bool(o, "support_cert_status_message", support_cert_status_message());
574 o << "session_ticket_lifetime = " << session_ticket_lifetime() << '\n';
575 o << "minimum_dh_group_size = " << minimum_dh_group_size() << '\n';
576 o << "minimum_ecdh_group_size = " << minimum_ecdh_group_size() << '\n';
577 o << "minimum_rsa_bits = " << minimum_rsa_bits() << '\n';
578 o << "minimum_signature_strength = " << minimum_signature_strength() << '\n';
579 }
virtual bool include_time_in_hello_random() const
Definition: tls_policy.cpp:340
virtual bool negotiate_encrypt_then_mac() const
Definition: tls_policy.cpp:343
virtual bool server_uses_own_ciphersuite_preferences() const
Definition: tls_policy.cpp:342
virtual uint32_t session_ticket_lifetime() const
Definition: tls_policy.cpp:268
virtual bool support_cert_status_message() const
Definition: tls_policy.cpp:344
virtual bool hide_unknown_users() const
Definition: tls_policy.cpp:341
virtual bool allow_insecure_renegotiation() const
Definition: tls_policy.cpp:334
virtual size_t minimum_signature_strength() const
Definition: tls_policy.cpp:203
virtual bool allow_server_initiated_renegotiation() const
Definition: tls_policy.cpp:333

References Botan::TLS::Policy::allow_dtls10(), Botan::TLS::Policy::allow_dtls12(), Botan::TLS::Policy::allow_insecure_renegotiation(), Botan::TLS::Policy::allow_server_initiated_renegotiation(), Botan::TLS::Policy::allow_tls10(), Botan::TLS::Policy::allow_tls11(), Botan::TLS::Policy::allow_tls12(), Botan::TLS::Policy::allowed_ciphers(), Botan::TLS::Policy::allowed_key_exchange_methods(), Botan::TLS::Policy::allowed_macs(), Botan::TLS::Policy::allowed_signature_hashes(), Botan::TLS::Policy::allowed_signature_methods(), Botan::TLS::Policy::hide_unknown_users(), Botan::TLS::Policy::include_time_in_hello_random(), Botan::TLS::Policy::key_exchange_groups(), Botan::TLS::Policy::minimum_dh_group_size(), Botan::TLS::Policy::minimum_ecdh_group_size(), Botan::TLS::Policy::minimum_rsa_bits(), Botan::TLS::Policy::minimum_signature_strength(), Botan::TLS::Policy::negotiate_encrypt_then_mac(), Botan::TLS::Policy::server_uses_own_ciphersuite_preferences(), Botan::TLS::Policy::session_ticket_lifetime(), and Botan::TLS::Policy::support_cert_status_message().

Referenced by Botan::TLS::Policy::to_string().

◆ request_client_certificate_authentication()

bool Botan::TLS::Policy::request_client_certificate_authentication ( ) const
virtualinherited

Indicate if client certificate authentication is requested. If true, then a cert will be requested.

Definition at line 348 of file tls_policy.cpp.

virtual bool require_client_certificate_authentication() const
Definition: tls_policy.cpp:347

References Botan::TLS::Policy::require_client_certificate_authentication().

◆ require_cert_revocation_info()

bool Botan::TLS::Policy::require_cert_revocation_info ( ) const
virtualinherited

Return if cert revocation info (CRL/OCSP) is required If true, validation will fail unless a valid CRL or OCSP response was examined.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 208 of file tls_policy.cpp.

209 {
210 return true;
211 }

Referenced by Botan::TLS::Text_Policy::require_cert_revocation_info(), and Botan::TLS::Callbacks::tls_verify_cert_chain().

◆ require_client_certificate_authentication()

bool Botan::TLS::Policy::require_client_certificate_authentication ( ) const
virtualinherited

Indicate if client certificate authentication is required. If true, then a cert will be requested and if the client does not send a certificate the connection will be closed.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 347 of file tls_policy.cpp.

347{ return false; }

Referenced by Botan::TLS::Policy::request_client_certificate_authentication(), and Botan::TLS::Text_Policy::require_client_certificate_authentication().

◆ send_fallback_scsv()

bool Botan::TLS::Policy::send_fallback_scsv ( Protocol_Version  version) const
virtualinherited

When offering this version, should we send a fallback SCSV? Default returns true iff version is not the latest version the policy allows, exists to allow override in case of interop problems.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 273 of file tls_policy.cpp.

274 {
275 return version != latest_supported_version(version.is_datagram_protocol());
276 }
virtual Protocol_Version latest_supported_version(bool datagram) const
Definition: tls_policy.cpp:300

References Botan::TLS::Protocol_Version::is_datagram_protocol(), and Botan::TLS::Policy::latest_supported_version().

Referenced by Botan::TLS::Client_Hello::Client_Hello(), and Botan::TLS::Text_Policy::send_fallback_scsv().

◆ server_uses_own_ciphersuite_preferences()

bool Botan::TLS::Policy::server_uses_own_ciphersuite_preferences ( ) const
virtualinherited
Returns
true if servers should choose the ciphersuite matching their highest preference, rather than the clients. Has no effect on client side.

Reimplemented in Botan::TLS::BSI_TR_02102_2, and Botan::TLS::Text_Policy.

Definition at line 342 of file tls_policy.cpp.

342{ return true; }

Referenced by Botan::TLS::Policy::print(), and Botan::TLS::Text_Policy::server_uses_own_ciphersuite_preferences().

◆ session_ticket_lifetime()

uint32_t Botan::TLS::Policy::session_ticket_lifetime ( ) const
virtualinherited

Return the allowed lifetime of a session ticket. If 0, session tickets do not expire until the session ticket key rolls over. Expired session tickets cannot be used to resume a session.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 268 of file tls_policy.cpp.

269 {
270 return 86400; // ~1 day
271 }

Referenced by Botan::TLS::Policy::print(), and Botan::TLS::Text_Policy::session_ticket_lifetime().

◆ srtp_profiles()

std::vector< uint16_t > Botan::TLS::Policy::srtp_profiles ( ) const
virtualinherited

If this returns a non-empty vector, and DTLS is negotiated, then we will also attempt to negotiate the SRTP extension from RFC 5764 using the returned values as the profile ids.

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 364 of file tls_policy.cpp.

365 {
366 return std::vector<uint16_t>();
367 }

Referenced by Botan::TLS::Client_Hello::Client_Hello(), and Botan::TLS::Server_Hello::Server_Hello().

◆ support_cert_status_message()

bool Botan::TLS::Policy::support_cert_status_message ( ) const
virtualinherited

Indicates whether certificate status messages should be supported

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 344 of file tls_policy.cpp.

344{ return true; }

Referenced by Botan::TLS::Client_Hello::Client_Hello(), Botan::TLS::Policy::print(), Botan::TLS::Server_Hello::Server_Hello(), and Botan::TLS::Text_Policy::support_cert_status_message().

◆ to_string()

std::string Botan::TLS::Policy::to_string ( ) const
inherited

Convert this policy to a printable format. Same as calling print on a ostringstream and reading o.str()

Definition at line 581 of file tls_policy.cpp.

582 {
583 std::ostringstream oss;
584 this->print(oss);
585 return oss.str();
586 }
virtual void print(std::ostream &o) const
Definition: tls_policy.cpp:553

References Botan::TLS::Policy::print().

◆ use_ecc_point_compression()

bool Botan::TLS::Policy::use_ecc_point_compression ( ) const
virtualinherited

Request that ECC curve points are sent compressed

Reimplemented in Botan::TLS::Text_Policy.

Definition at line 127 of file tls_policy.cpp.

128 {
129 return false;
130 }

Referenced by Botan::TLS::Client_Hello::Client_Hello(), Botan::TLS::Server_Hello::Server_Hello(), and Botan::TLS::Text_Policy::use_ecc_point_compression().


The documentation for this class was generated from the following file: