pike.git/lib/modules/SSL.pmod/Context.pike:2883e0964c869f2657cb6e0cb517fbd96f4d9a92

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1222 1223 1224 1225 1226 #pike __REAL_VERSION__ #pragma strict_types #require constant(Crypto.Hash) //! Keeps the state that is shared by all SSL-connections on a client, //! or for one port on a server. It includes policy configuration, //! the server or client certificate(s), the corresponding private key(s), //! etc. It also includes the session cache. //! //! The defaults are usually suitable for a client, but for a server //! some configuration is necessary. //! //! Typical use is to: //! @ul //! @item //! Call @[add_cert()] with the certificates belonging to the server //! or client. Note that clients often don't have or need any //! certificates, and also that certificate-less server operation is //! possible, albeit discouraged and not enabled by default. //! //! Suitable self-signed certificates can be created with //! @[Standards.X509.make_selfsigned_certificate()]. //! @item //! Optionally call @[get_suites()] to get a set of cipher_suites //! to assign to @[preferred_suites]. This is only needed if the //! default set of suites from @expr{get_suites(128, 1)@} isn't //! satisfactory. //! @endul //! //! The initialized @[Context] object is then passed to //! @[File()->create()] or used as is embedded in @[Port]. //! //! @seealso //! @[File], @[Port], @[Standards.X509] #ifdef SSL3_DEBUG #define SSL3_DEBUG_MSG(X ...) werror(X) #else /*! SSL3_DEBUG */ #define SSL3_DEBUG_MSG(X ...) #endif /* SSL3_DEBUG */ import "."; import Constants; protected void create() { SSL3_DEBUG_MSG("SSL.Context->create\n"); /* Backwards compatibility */ preferred_suites = get_suites(128, 1); } //! The minimum supported protocol version. //! //! Defaults to @[PROTOCOL_TLS_1_0]. //! //! @note //! This value should not be greater than @[max_version]. ProtocolVersion min_version = PROTOCOL_TLS_1_0; //! The maximum supported protocol version. //! //! Defaults to @[PROTOCOL_TLS_MAX]. //! //! @note //! This value should not be less than @[min_version]. ProtocolVersion max_version = PROTOCOL_TLS_MAX; //! List of advertised protocols using using TLS application level //! protocol negotiation. array(string(8bit)) advertised_protocols; //! Mapping of supported verifier algorithms to hash implementation. //! //! @seealso //! @[Standards.X509.get_algorithms()] mapping(Standards.ASN1.Types.Identifier:Crypto.Hash) verifier_algorithms = filter(Standards.X509.get_algorithms(), lambda(object o) { return !(< #if constant(Crypto.MD2) Crypto.MD2, #endif Crypto.MD5, Crypto.SHA1 >)[o]; }); //! The maximum amount of data that is sent in each SSL packet by //! @[File]. A value between 1 and @[Constants.PACKET_MAX_SIZE]. int packet_max_size = PACKET_MAX_SIZE; //! Lists the supported compression algorithms in order of preference. //! //! Defaults to @expr{({ COMPRESSION_null })@} due to SSL attacks that //! target compression. array(int) preferred_compressors = ({ COMPRESSION_null }); //! If set, the other peer will be probed for the heartbleed bug //! during handshake. If heartbleed is found the connection is closed //! with insufficient security fatal error. int(0..1) heartbleed_probe = 0; //! @decl Alert alert_factory(SSL.Connection con, int level, int description, @ //! ProtocolVersion version, @ //! string|void message, mixed|void trace) //! //! Alert factory. //! //! This function may be overloaded to eg obtain logging of //! generated alerts. //! //! @param con //! Connection which caused the alert. //! //! @param level //! Level of alert. //! //! @param description //! Description code for the alert. //! //! @param message //! Optional log message for the alert. //! //! @note //! Not all alerts are fatal, and some (eg @[ALERT_close_notify]) are used //! during normal operation. Alert alert_factory(object con, int(1..2) level, int(8bit) description, ProtocolVersion version, string|void message) { return Alert(level, description, version, message); } // // --- Cryptography // //! Temporary, non-certified, private keys, used for RSA key exchange //! in export mode. They are used as follows: //! //! @[short_rsa] is a 512-bit RSA key used for the SSL 3.0 and TLS 1.0 //! export cipher suites. //! //! @[long_rsa] is a 1024-bit RSA key to be used for the RSA_EXPORT1024 //! suites from draft-ietf-tls-56-bit-ciphersuites-01.txt. //! //! They have associated counters @[short_rsa_counter] and @[long_rsa_counter], //! which are decremented each time the keys are used. //! //! When the counters reach zero, the corresponding RSA key is cleared, //! and a new generated on demand at which time the counter is reset. Crypto.RSA.State long_rsa; Crypto.RSA.State short_rsa; //! Counters for export RSA keys. int long_rsa_counter; int short_rsa_counter; //! Used to generate random cookies for the hello-message. If we use //! the RSA keyexchange method, and this is a server, this random //! number generator is not used for generating the master_secret. By //! default set to @[Crypto.Random.random_string]. function(int(0..):string(8bit)) random = Crypto.Random.random_string; //! Attempt to enable encrypt-then-mac mode. int encrypt_then_mac = 1; //! Cipher suites we want to support, in order of preference, best //! first. array(int) preferred_suites; //! Supported elliptical curve cipher curves in order of preference. array(int) ecc_curves = reverse(sort(indices(ECC_CURVES))); //! Supported DH groups for DHE key exchanges, in order of preference. //! Defaults to FFDHE-2048. array(Crypto.DH.Parameters) dh_groups = ({ Crypto.DH.FFDHE2048, }); //! The set of <hash, signature> combinations to use by us. //! //! Only used with TLS 1.2 and later. //! //! Defaults to all combinations supported by Pike except for MD5. //! //! This list is typically filtered by @[get_signature_algorithms()] //! to get rid of combinations not supported by the runtime. //! //! @note //! According to RFC 5246 7.4.2 all certificates needs to be signed //! by any of the supported signature algorithms. To be forward //! compatible this list needs to be limited to the combinations //! that have existing PKCS identifiers. //! //! @seealso //! @[get_signature_algorithms()] array(array(int)) signature_algorithms = ({ #if constant(Crypto.SHA512) #if constant(Crypto.ECC.Curve) ({ HASH_sha512, SIGNATURE_ecdsa }), #endif ({ HASH_sha512, SIGNATURE_rsa }), #endif #if constant(Crypto.SHA384) #if constant(Crypto.ECC.Curve) ({ HASH_sha384, SIGNATURE_ecdsa }), #endif ({ HASH_sha384, SIGNATURE_rsa }), #endif #if constant(Crypto.ECC.Curve) ({ HASH_sha256, SIGNATURE_ecdsa }), #endif ({ HASH_sha256, SIGNATURE_dsa }), ({ HASH_sha256, SIGNATURE_rsa }), #if constant(Crypto.SHA224) #if constant(Crypto.ECC.Curve) ({ HASH_sha224, SIGNATURE_ecdsa }), #endif ({ HASH_sha224, SIGNATURE_dsa }), #endif #if constant(Crypto.ECC.Curve) ({ HASH_sha, SIGNATURE_ecdsa }), #endif ({ HASH_sha, SIGNATURE_dsa }), ({ HASH_sha, SIGNATURE_rsa }), }); //! Get the (filtered) set of locally supported signature algorithms. //! //! @seealso //! @[signature_algorithms] array(array(int)) get_signature_algorithms(array(array(int))|void signature_algorithms) { if (!signature_algorithms) { signature_algorithms = this_program::signature_algorithms; } #if constant(Crypto.ECC.Curve) && constant(Crypto.SHA512) && \ constant(Crypto.SHA384) && constant(Crypto.SHA224) return signature_algorithms; #else return [array(array(int))] filter(signature_algorithms, lambda(array(int) pair) { [int hash, int sign] = pair; #if !constant(Crypto.ECC.Curve) if (sign == SIGNATURE_ecdsa) return 0; #endif if ((< #if !constant(Crypto.SHA512) HASH_sha512, #endif #if !constant(Crypto.SHA384) HASH_sha384, #endif #if !constant(Crypto.SHA224) HASH_sha224, #endif >)[hash]) return 0; return 1; }); #endif } // Generate a sort key for a cipher suite. // // The larger the value, the stronger the cipher suite. protected int cipher_suite_sort_key(int suite) { array(int) info = [array(int)] (CIPHER_SUITES[suite] || ({ 0, 0, 0 })); int keylength = CIPHER_effective_keylengths[info[1]]; // NB: Currently the hash algorithms are allocated in a suitable order. int hash = info[2]; // Adjust for the cipher mode. if (sizeof(info) > 3) { hash |= info[3]<<5; if (info[3] == MODE_cbc) { // CBC. keylength >>= 1; } } else { // Old suite; CBC or RC4. // This adjustment is to make some browsers (like eg Chrome) // stop complaining, by preferring AES128/GCM to AES256/CBC. keylength >>= 1; } // NB: As are the cipher ids if you disregard the keylengths. int cipher = info[1]; // FIXME: I'm not quite sure about the priorities here. int ke_prio = ([ KE_null: 0, KE_dh_anon: 1, KE_ecdh_anon: 2, KE_fortezza: 3, KE_dms: 4, KE_dh_rsa: 5, KE_dh_dss: 6, KE_rsa: 7, KE_rsa_fips: 8, KE_ecdh_rsa: 9, KE_ecdh_ecdsa: 10, KE_dhe_rsa: 11, KE_dhe_dss: 12, KE_ecdhe_rsa: 13, KE_ecdhe_ecdsa: 14, ])[info[0]]; int auth_prio = keylength && ([ KE_null: 0, KE_dh_anon: 0, KE_ecdh_anon: 0, KE_fortezza: 1, KE_dms: 2, KE_rsa: 8, KE_rsa_fips: 8, KE_dhe_rsa: 8, KE_ecdhe_rsa: 8, KE_dh_dss: 8, KE_dh_rsa: 8, KE_dhe_dss: 8, KE_ecdh_rsa: 8, KE_ecdh_ecdsa: 8, KE_ecdhe_ecdsa: 8, ])[info[0]]; // int not_anonymous = ke_prio >= 3; // Klugde to test GCM. // if (sizeof(info) > 3) keylength += 0x100; // NB: 8 bits for cipher. // 8 bits for hash + mode. // 8 bits for key exchange. // 12 bits for keylength. // 4 bits for auth. return cipher | hash << 8 | ke_prio << 16 | keylength << 24 | auth_prio << 36; } //! Sort a set of cipher suites according to our preferences. //! //! @returns //! Returns the array sorted with the most preferrable (aka "best") //! cipher suite first. //! //! @note //! The original array (@[suites]) is modified destructively, //! but is not the same array as the result. array(int) sort_suites(array(int) suites) { sort(map(suites, cipher_suite_sort_key), suites); return reverse(suites); } //! Get the prioritized list of supported cipher suites //! that satisfy the requirements. //! //! @param min_keylength //! Minimum supported effective keylength in bits. Defaults to @expr{128@}. //! Specify @expr{-1@} to enable null ciphers. //! //! @param ke_mode //! Level of protection for the key exchange. //! @int //! @value 0 //! Require forward secrecy (ephemeral keys). //! @value 1 //! Also allow certificate based key exchanges. //! @value 2 //! Allow anonymous server key exchange. Note that this //! allows for man in the middle attacks. //! @endint //! //! @param blacklisted_ciphers //! Multiset of ciphers that are NOT to be used. //! //! @param blacklisted_kes //! Multiset of key exchange methods that are NOT to be used. //! //! @param blacklisted_hashes //! Multiset of hash algoriths that are NOT to be used. //! //! @param blacklisted_ciphermodes //! Multiset of cipher modes that are NOT to be used. //! //! @note //! Note that the effective keylength may differ from //! the actual keylength for old ciphers where there //! are known attacks. array(int) get_suites(int(-1..)|void min_keylength, int(0..2)|void ke_flags, multiset(int)|void blacklisted_ciphers, multiset(KeyExchangeType)|void blacklisted_kes, multiset(HashAlgorithm)|void blacklisted_hashes, multiset(CipherModes)|void blacklisted_ciphermodes) { if (!min_keylength) min_keylength = 128; // Reasonable default. // Ephemeral key exchange methods. multiset(int) kes = (< KE_dhe_rsa, KE_dhe_dss, KE_ecdhe_rsa, KE_ecdhe_ecdsa, >); if (ke_flags) { // Static certificate based key exchange methods. kes |= (< KE_rsa, KE_rsa_fips, KE_dh_rsa, KE_dh_dss, #if constant(Crypto.ECC.Curve) KE_ecdh_rsa, KE_ecdh_ecdsa, #endif >); if (ke_flags == 2) { // Unsigned key exchange methods. kes |= (< KE_null, KE_dh_anon, #if constant(Crypto.ECC.Curve) KE_ecdh_anon, #endif >); } } #if constant(Crypto.ECC.Curve) if (!sizeof(ecc_curves)) { // No ECC curves available ==> No support for ECC. kes -= (< KE_ecdhe_rsa, KE_ecdhe_ecdsa, KE_ecdh_rsa, KE_ecdh_ecdsa, KE_ecdh_anon, >); } #endif if (blacklisted_kes) { kes -= blacklisted_kes; } // Filter unsupported key exchange methods. array(int) res = filter(indices(CIPHER_SUITES), lambda(int suite) { return kes[CIPHER_SUITES[suite][0]]; }); // Filter short effective key lengths. if (min_keylength > 0) { res = filter(res, lambda(int suite, int min_keylength) { return min_keylength <= CIPHER_effective_keylengths[CIPHER_SUITES[suite][1]]; }, min_keylength); } if (blacklisted_ciphers) { res = filter(res, lambda(int suite, multiset(int) blacklisted_hashes) { return !blacklisted_hashes[CIPHER_SUITES[suite][1]]; }, blacklisted_ciphers); } #if !constant(Crypto.SHA384) // Filter suites needing SHA384 as our Nettle doesn't support it. if (!blacklisted_hashes) blacklisted_hashes = (< HASH_sha384 >); else blacklisted_hashes[HASH_sha384] = 1; #endif if (blacklisted_hashes) { res = filter(res, lambda(int suite, multiset(int) blacklisted_hashes) { return !blacklisted_hashes[CIPHER_SUITES[suite][2]]; }, blacklisted_hashes); } if (blacklisted_ciphermodes) { res = filter(res, lambda(int suite, multiset(int) blacklisted_ciphermodes) { array(int) info = [array(int)]CIPHER_SUITES[suite]; int mode = (sizeof(info) > 3)?info[3]:MODE_cbc; return !blacklisted_ciphermodes[mode]; }, blacklisted_ciphermodes); } switch(max_version) { case PROTOCOL_TLS_1_1: case PROTOCOL_TLS_1_0: case PROTOCOL_SSL_3_0: res = filter(res, lambda(int suite) { array(int) info = [array(int)]CIPHER_SUITES[suite]; // AEAD suites are not supported in TLS versions // prior to TLS 1.2. // Hashes other than md5 or sha1 are not supported // prior to TLS 1.2. return (sizeof(info) < 4) && (info[2] <= HASH_sha); }); break; } // Sort and return. return sort_suites(res); } //! Filter cipher suites from @[preferred_suites] that don't have a //! key with an effective length of at least @[min_keylength] bits. void filter_weak_suites(int min_keylength) { if (!preferred_suites || !min_keylength) return; preferred_suites = filter(preferred_suites, lambda(int suite) { array(int) def = [array(int)]CIPHER_SUITES[suite]; return def && (CIPHER_effective_keylengths[def[1]] >= min_keylength); }); } #if constant(Crypto.ECC.Curve) && constant(Crypto.AES.GCM) && constant(Crypto.SHA384) //! Configure the context for Suite B compliant operation. //! //! This restricts the context to the cipher suites //! specified by RFC 6460 in strict mode. //! //! Additional suites may be enabled, but they will only be //! selected if a Suite B suite isn't available. //! //! @param min_keylength //! Minimum supported key length in bits. Either @expr{128@} //! or @expr{192@}. //! //! @param strictness_level //! Allow additional suites. //! @int //! @value 2.. //! Strict mode. //! //! Allow only the Suite B suites from RFC 6460 and TLS 1.2. //! @value 1 //! Transitional mode. //! //! Also allow the transitional suites from RFC 5430 for use //! with TLS 1.0 and 1.1. //! @value 0 //! Permissive mode (default). //! //! Also allow other suites that conform to the minimum key length. //! @endint //! //! @note //! This function is only present when Suite B compliant operation //! is possible (ie both elliptic curves and GCM are available). //! //! @note //! Note also that for Suite B server operation compliant certificates //! need to be added with @[add_cert()]. //! //! @seealso //! @[get_suites()] void configure_suite_b(int(128..)|void min_keylength, int(0..)|void strictness_level) { if (min_keylength < 128) min_keylength = 128; if (min_keylength > 128) { preferred_suites = ({ TLS_ecdhe_ecdsa_with_aes_256_gcm_sha384, }); } else { preferred_suites = ({ TLS_ecdhe_ecdsa_with_aes_128_gcm_sha256, TLS_ecdhe_ecdsa_with_aes_256_gcm_sha384, }); } max_version = PROTOCOL_TLS_MAX; min_version = PROTOCOL_TLS_1_2; if (strictness_level < 2) { // Transitional or permissive mode. // Allow TLS 1.0. min_version = PROTOCOL_TLS_1_0; // First add the transitional suites. if (min_keylength > 128) { // Transitional Suite B Combination 2 preferred_suites += ({ TLS_ecdhe_ecdsa_with_aes_256_cbc_sha, }); } else { // Transitional Suite B Combination 1 preferred_suites += ({ TLS_ecdhe_ecdsa_with_aes_128_cbc_sha, TLS_ecdhe_ecdsa_with_aes_256_cbc_sha, }); } if (strictness_level < 1) { // Permissive mode. Add the remaining suites of // the required strength. preferred_suites += get_suites(min_keylength) - preferred_suites; } } } #endif /* Crypto.ECC.Curve && Crypto.AES.GCM && Crypto.SHA384 */ // // --- Certificates and authentication // // Unless connecting in anonymous mode the server has to have a set of // CertificatePair certificate chains to sign its handshake with. // These are stored in the cert_chains_domain mapping, where they are // retrieved based on domain the client is connecting to. // // If the server sends a certificate request the client has to respond // with a certificate matching the requested issuer der. These are // stored in the cert_chains_issuer mapping. // // The client/server potentially has a set of trusted issuers // certificate (root certificates) that are used to validate the // server/client sent certificate. These are stored in a cache from // subject der to Verifier object. FIXME: Should use key identifier. //! Policy for client authentication. One of //! @[SSL.Constants.AUTHLEVEL_none], @[SSL.Constants.AUTHLEVEL_ask] //! and @[SSL.Constants.AUTHLEVEL_require]. int auth_level; //! Array of authorities that are accepted for client certificates. //! The server will only accept connections from clients whose //! certificate is signed by one of these authorities. The string is a //! DER-encoded certificate, which typically must be decoded using //! @[MIME.decode_base64] or @[Standards.PEM.Messages] first. //! //! Note that it is presumed that the issuer will also be trusted by //! the server. See @[trusted_issuers] for details on specifying //! trusted issuers. //! //! If empty, the server will accept any client certificate whose //! issuer is trusted by the server. void set_authorities(array(string) a) { authorities = a; update_authorities(); } //! When set, require the chain to be known, even if the root is self //! signed. //! //! Note that if set, and certificates are set to be verified, trusted //! issuers must be provided, or no connections will be accepted. int require_trust=0; //! Get the list of allowed authorities. See @[set_authorities]. array(string) get_authorities() { return authorities; } protected array(string) authorities = ({}); array(string(8bit)) authorities_cache = ({}); //! Sets the list of trusted certificate issuers. //! //! @param a //! //! An array of certificate chains whose root is self signed (ie a //! root issuer), and whose final certificate is an issuer that we //! trust. The root of the certificate should be first certificate in //! the chain. The string is a DER-encoded certificate, which //! typically must be decoded using @[MIME.decode_base64] or //! @[Standards.PEM.Messages] first. //! //! If this array is left empty, and the context is set to verify //! certificates, a certificate chain must have a root that is self //! signed. void set_trusted_issuers(array(array(string)) i) { trusted_issuers = i; update_trusted_issuers(); } //! Get the list of trusted issuers. See @[set_trusted_issuers]. array(array(string)) get_trusted_issuers() { return trusted_issuers; } protected array(array(string)) trusted_issuers = ({}); mapping(string:array(Standards.X509.Verifier)) trusted_issuers_cache = ([]); //! Determines whether certificates presented by the peer are //! verified, or just accepted as being valid. int verify_certificates = 0; //! For client authentication. Used only if auth_level is AUTH_ask or //! AUTH_require. array(int) preferred_auth_methods = ({ AUTH_rsa_sign }); // Lookup from issuer DER to an array of suitable @[CertificatePair]s, // sorted in order of strength. protected mapping(string(8bit):array(CertificatePair)) cert_chains_issuer = ([]); // Lookup from DN/SNI domain name/glob to an array of suitable // @[CertificatePair]s, sorted in order of strength. protected mapping(string(8bit):array(CertificatePair)) cert_chains_domain = ([]); //! Look up a suitable set of certificates for the specified issuer. //! @[UNDEFIEND] if no certificate was found. array(CertificatePair) find_cert_issuer(array(string) ders) { // Return the first matching issuer. FIXME: Should we merge if // several matching issuers are found? foreach(ders, string der) if(cert_chains_issuer[der]) return cert_chains_issuer[der]; // We MAY return any certificate here. Let's not reveal any // certificates not specifically requested. return UNDEFINED; } //! Look up a suitable set of certificates for the specified domain. //! @[UNDEFINED] if no certificate was found. array(CertificatePair) find_cert_domain(string(8bit) domain) { if( domain ) { if( cert_chains_domain[domain] ) return cert_chains_domain[domain]; // Return first matching chain that isn't a fallback certificate. foreach(cert_chains_domain; string g; array(CertificatePair) chains) if( glob(g, domain) && (g != "*") ) return chains; } return cert_chains_domain["*"]; } //! Returns a list of all server certificates added with @[add_cert]. array(CertificatePair) get_certificates() { mapping(CertificatePair:int) c = ([]); foreach(cert_chains_domain;; array(CertificatePair) chains) foreach(chains, CertificatePair p) c[p]++; return indices(c); } //! Add a certificate. //! //! This function is used on both servers and clients to add //! a key and chain of certificates to the set of certificate //! candidates to use in @[find_cert()]. //! //! On a server these are used in the normal initial handshake, //! while on a client they are only used if a server requests //! client certificate authentication. //! //! @param key //! Private key matching the first certificate in @[certs]. //! //! Supported key types are currently: //! @mixed //! @type Crypto.RSA.State //! Rivest-Shamir-Adelman. //! @type Crypto.DSA.State //! Digital Signing Algorithm. //! @type Crypto.ECC.Curve.ECDSA //! Elliptic Curve Digital Signing Algorithm. //! @endmixed //! //! This key MUST match the public key in the first certificate //! in @[certs]. //! //! @param certs //! A chain of X509.v1 or X509.v3 certificates, with the local //! certificate first and root-most certificate last. //! //! @param extra_name_globs //! Further SNI globs (than the ones in the first certificate), that //! this certificate should be selected for. Typically used to set //! the default certificate(s) by specifying @expr{({ "*" })@}. //! //! The SNI globs are only relevant for server-side certificates. //! //! @param cp //! An alternative is to send an initialized @[CertificatePair]. //! //! @throws //! The function performs various validations of the @[key] //! and @[certs], and throws errors if the validation fails. //! //! @seealso //! @[find_cert()] void add_cert(Crypto.Sign.State key, array(string(8bit)) certs, array(string(8bit))|void extra_name_globs) { CertificatePair cp = CertificatePair(key, certs, extra_name_globs); add_cert(cp); } variant void add_cert(string(8bit) key, array(string(8bit)) certs, array(string(8bit))|void extra_name_globs) { Crypto.Sign.State _key = Standards.PKCS.RSA.parse_private_key(key) || Standards.PKCS.DSA.parse_private_key(key) || #if constant(Crypto.ECC.Curve) Standards.PKCS.ECDSA.parse_private_key(key) || #endif 0; add_cert(_key, certs, extra_name_globs); } variant void add_cert(CertificatePair cp) { void add(string what, mapping(string:array(CertificatePair)) to) { if( !to[what] ) to[what] = ({cp}); else to[what] = sort( to[what]+({cp}) ); }; // FIXME: Look at leaf flags to determine which mapping to store the // chains in. // Insert cp in cert_chains both under all DN/SNI names/globs and // under issuer DER. Keep lists sorted by strength. foreach( cp->globs, string id ) add(id, cert_chains_domain); add(cp->issuers[0], cert_chains_issuer); } // update the cached decoded authorities list private void update_authorities() { authorities_cache = ({}); foreach(authorities, string a) authorities_cache += ({ Standards.X509.decode_certificate(a)-> subject->get_der() }); } // update the cached decoded issuers list private void update_trusted_issuers() { trusted_issuers_cache=([]); foreach(trusted_issuers, array(string) i) { // make sure the chain is valid and intact. mapping result = Standards.X509.verify_certificate_chain(i, ([]), 0); if(!result->verified) error("Broken trusted issuer chain!\n"); // FIXME: The pathLenConstraint does not survive the cache. // The leaf of the trusted issuer is the root to validate // certificate chains against. Standards.X509.TBSCertificate cert = ([array(object(Standards.X509.TBSCertificate))]result->certificates)[-1]; if( !cert->ext_basicConstraints_cA || !(cert->ext_keyUsage & Standards.X509.KU_keyCertSign) ) error("Trusted issuer not allowed to sign other certificates.\n"); trusted_issuers_cache[cert->subject->get_der()] += ({ cert->public_key }); } } // // --- Sessions // //! Non-zero to enable caching of sessions int use_cache = 1; //! Sessions are removed from the cache when they are older than this //! limit (in seconds). Sessions are also removed from the cache if a //! connection using the session dies unexpectedly. int session_lifetime = 600; //! Maximum number of sessions to keep in the cache. int max_sessions = 300; /* Queue of pairs (time, id), in cronological order */ ADT.Queue active_sessions = ADT.Queue(); mapping(string:Session) session_cache = ([]); // Remove sessions older than @[session_lifetime] from the session cache. void forget_old_sessions() { int t = time() - session_lifetime; array pair; while ( (pair = [array]active_sessions->peek()) && (pair[0] < t)) { SSL3_DEBUG_MSG("SSL.Context->forget_old_sessions: " "garbing session %O due to session_lifetime limit\n", pair[1]); m_delete (session_cache, [string]([array]active_sessions->get())[1]); } } //! Lookup a session identifier in the cache. Returns the //! corresponding session, or zero if it is not found or caching is //! disabled. Session lookup_session(string id) { if (use_cache) return session_cache[id]; else return 0; } //! Decode a session ticket and return the corresponding session //! if valid or zero if invalid. //! //! @note //! The default implementation just calls @[lookup_session()]. //! //! Override this function (and @[encode_ticket()]) to implement //! server-side state-less session resumption. //! //! @seealso //! @[encode_ticket()], @[lookup_session()] Session decode_ticket(string(8bit) ticket) { return lookup_session(ticket); } //! Generate a session ticket for a session. //! //! @note //! The default implementation just generates a random ticket //! and calls @[record_session()] to store it. //! //! Over-ride this function (and @[decode_ticket()]) to implement //! server-side state-less session resumption. //! //! @returns //! Returns @expr{0@} (zero) on failure (ie cache disabled), and //! an array on success: //! @array //! @elem string(8bit) 0 //! Non-empty string with the ticket. //! @elem int 1 //! Lifetime hint for the ticket. //! @endarray //! //! @seealso //! @[decode_ticket()], @[record_session()], @rfc{4507:3.3@} array(string(8bit)|int) encode_ticket(Session session) { if (!use_cache) return 0; string(8bit) ticket = session->ticket; if (!sizeof(ticket||"")) { do { ticket = random(32); } while(session_cache[ticket]); // FIXME: Should we update the fields here? // Consider moving this to the caller. session->ticket = ticket; session->ticket_expiry_time = time(1) + 3600; } string(8bit) orig_id = session->identity; session->identity = ticket; record_session(session); session->identity = orig_id; // FIXME: Calculate the lifetime from the ticket_expiry_time field? return ({ ticket, 3600 }); } //! Create a new session. Session new_session() { string(8bit) id = ""; if(use_cache) do { id = random(32); } while( session_cache[id] ); return Session(id); } //! Add a session to the cache (if caching is enabled). void record_session(Session s) { if (use_cache && sizeof(s->identity||"")) { while (sizeof (active_sessions) >= max_sessions) { array pair = [array] active_sessions->get(); SSL3_DEBUG_MSG("SSL.Context->record_session: " "garbing session %O due to max_sessions limit\n", pair[1]); m_delete (session_cache, [string]pair[1]); } forget_old_sessions(); SSL3_DEBUG_MSG("SSL.Context->record_session: caching session %O\n", s->identity); active_sessions->put( ({ time(1), s->identity }) ); session_cache[s->identity] = s; } } //! Invalidate a session for resumption and remove it from the cache. void purge_session(Session s) { SSL3_DEBUG_MSG("SSL.Context->purge_session: %O\n", s->identity || ""); if (s->identity) m_delete (session_cache, s->identity); /* RFC 4346 7.2: * In this case [fatal alert], other connections corresponding to * the session may continue, but the session identifier MUST be * invalidated, preventing the failed session from being used to * establish new connections. */ s->identity = 0; if (s->version > PROTOCOL_TLS_1_2) { // In TLS 1.2 and earlier the master_secret may be shared // between multiple concurrent connections (cf eg above), // so we can't scratch the master secret. s->master_secret = 0; } /* There's no need to remove the id from the active_sessions queue */ } // // --- Compat code below // protected Crypto.RSA.State compat_rsa; protected array(string(8bit)) compat_certificates; //! The servers default private RSA key. //! //! Compatibility, don't use. //! //! @deprecated find_cert //! //! @seealso //! @[`certificates], @[find_cert()] __deprecated__ Crypto.RSA.State `rsa() { return compat_rsa; } //! Set the servers default private RSA key. //! //! Compatibility, don't use. //! //! @deprecated add_cert //! //! @seealso //! @[`certificates=], @[add_cert()] __deprecated__ void `rsa=(Crypto.RSA.State k) { compat_rsa = k; if (k && compat_certificates) { catch { add_cert(k, compat_certificates); }; } } //! The server's certificate, or a chain of X509.v3 certificates, with //! the server's certificate first and root certificate last. //! //! Compatibility, don't use. //! //! @deprecated find_cert //! //! @seealso //! @[`rsa], @[find_cert()] __deprecated__ array(string(8bit)) `certificates() { return compat_certificates; } //! Set the servers certificate, or a chain of X509.v3 certificates, with //! the servers certificate first and root certificate last. //! //! Compatibility, don't use. //! //! @deprecated add_cert //! //! @seealso //! @[`rsa=], @[add_cert()] __deprecated__ void `certificates=(array(string(8bit)) certs) { compat_certificates = certs; if (compat_rsa && certs) { catch { add_cert(compat_rsa, certs); }; } } //! The clients RSA private key. //! //! Compatibility, don't use. //! //! @deprecated find_cert //! //! @seealso //! @[`certificates], @[find_cert()] __deprecated__ Crypto.RSA.State `client_rsa() { return compat_rsa; } //! Set the clients default private RSA key. //! //! Compatibility, don't use. //! //! @deprecated add_cert //! //! @seealso //! @[`client_certificates=], @[add_cert()] __deprecated__ void `client_rsa=(Crypto.RSA.State k) { compat_rsa = k; if (k && compat_certificates) { catch { add_cert(k, compat_certificates); }; } } //! The client's certificate, or a chain of X509.v3 certificates, with //! the client's certificate first and root certificate last. //! //! Compatibility, don't use. //! //! @deprecated find_cert //! //! @seealso //! @[`rsa], @[find_cert()] __deprecated__ array(array(string(8bit))) `client_certificates() { return compat_certificates && ({ compat_certificates }); } //! Set the client's certificate, or a chain of X509.v3 certificates, with //! the client's certificate first and root certificate last. //! //! Compatibility, don't use. //! //! @deprecated add_cert //! //! @seealso //! @[`rsa=], @[add_cert()] __deprecated__ void `client_certificates=(array(array(string(8bit))) certs) { compat_certificates = certs && (sizeof(certs)?certs[0]:({})); if (compat_rsa && certs) { foreach(certs, array(string(8bit)) chain) { catch { add_cert(compat_rsa, chain); }; } } } //! Compatibility. //! @deprecated find_cert __deprecated__ Crypto.DSA.State `dsa() { return UNDEFINED; } //! Compatibility. //! @deprecated add_cert __deprecated__ void `dsa=(Crypto.DSA.State k) { error("The old DSA API is not supported anymore.\n"); } //! Set @[preferred_suites] to RSA based methods. //! //! @param min_keylength //! Minimum acceptable key length in bits. //! //! @seealso //! @[dhe_dss_mode()], @[filter_weak_suites()] //! //! @deprecated get_suites __deprecated__ void rsa_mode(int(0..)|void min_keylength) { SSL3_DEBUG_MSG("SSL.Context: rsa_mode()\n"); preferred_suites = get_suites(min_keylength, 1); } //! Set @[preferred_suites] to DSS based methods. //! //! @param min_keylength //! Minimum acceptable key length in bits. //! //! @seealso //! @[rsa_mode()], @[filter_weak_suites()] //! //! @deprecated get_suites __deprecated__ void dhe_dss_mode(int(0..)|void min_keylength) { SSL3_DEBUG_MSG("SSL.Context: dhe_dss_mode()\n"); preferred_suites = get_suites(min_keylength, 1); }

pike.git/ lib/ modules/ SSL.pmod/ Context.pike > 2883e0964c869f2657cb6e0cb517fbd96f4d9a92 [Annotate]