| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef QUICHE_QUIC_CORE_CRYPTO_QUIC_CRYPTO_CLIENT_CONFIG_H_ |
| #define QUICHE_QUIC_CORE_CRYPTO_QUIC_CRYPTO_CLIENT_CONFIG_H_ |
| |
| #include <cstdint> |
| #include <map> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "absl/strings/string_view.h" |
| #include "third_party/boringssl/src/include/openssl/base.h" |
| #include "third_party/boringssl/src/include/openssl/ssl.h" |
| #include "quic/core/crypto/crypto_handshake.h" |
| #include "quic/core/crypto/crypto_protocol.h" |
| #include "quic/core/crypto/proof_source.h" |
| #include "quic/core/crypto/transport_parameters.h" |
| #include "quic/core/quic_packets.h" |
| #include "quic/core/quic_server_id.h" |
| #include "quic/platform/api/quic_export.h" |
| #include "quic/platform/api/quic_reference_counted.h" |
| |
| namespace quic { |
| |
| class CryptoHandshakeMessage; |
| class ProofVerifier; |
| class ProofVerifyDetails; |
| class QuicRandom; |
| |
| // QuicResumptionState stores the state a client needs for performing connection |
| // resumption. |
| struct QUIC_EXPORT_PRIVATE QuicResumptionState { |
| // |tls_session| holds the cryptographic state necessary for a resumption. It |
| // includes the ALPN negotiated on the connection where the ticket was |
| // received. |
| bssl::UniquePtr<SSL_SESSION> tls_session; |
| |
| // If the application using QUIC doesn't support 0-RTT handshakes or the |
| // client didn't receive a 0-RTT capable session ticket from the server, |
| // |transport_params| will be null. Otherwise, it will contain the transport |
| // parameters received from the server on the original connection. |
| std::unique_ptr<TransportParameters> transport_params = nullptr; |
| |
| // If |transport_params| is null, then |application_state| is ignored and |
| // should be empty. |application_state| contains serialized state that the |
| // client received from the server at the application layer that the client |
| // needs to remember when performing a 0-RTT handshake. |
| std::unique_ptr<ApplicationState> application_state = nullptr; |
| }; |
| |
| // SessionCache is an interface for managing storing and retrieving |
| // QuicResumptionState structs. |
| class QUIC_EXPORT_PRIVATE SessionCache { |
| public: |
| virtual ~SessionCache() {} |
| |
| // Inserts |session|, |params|, and |application_states| into the cache, keyed |
| // by |server_id|. Insert is first called after all three values are present. |
| // The ownership of |session| is transferred to the cache, while other two are |
| // copied. Multiple sessions might need to be inserted for a connection. |
| // SessionCache implementations should support storing |
| // multiple entries per server ID. |
| virtual void Insert(const QuicServerId& server_id, |
| bssl::UniquePtr<SSL_SESSION> session, |
| const TransportParameters& params, |
| const ApplicationState* application_state) = 0; |
| |
| // Lookup is called once at the beginning of each TLS handshake to potentially |
| // provide the saved state both for the TLS handshake and for sending 0-RTT |
| // data (if supported). Lookup may return a nullptr. Implementations should |
| // delete cache entries after returning them in Lookup so that session tickets |
| // are used only once. |
| virtual std::unique_ptr<QuicResumptionState> Lookup( |
| const QuicServerId& server_id, |
| const SSL_CTX* ctx) = 0; |
| |
| // Called when 0-RTT is rejected. Disables early data for all the TLS tickets |
| // associated with |server_id|. |
| virtual void ClearEarlyData(const QuicServerId& server_id) = 0; |
| }; |
| |
| // QuicCryptoClientConfig contains crypto-related configuration settings for a |
| // client. Note that this object isn't thread-safe. It's designed to be used on |
| // a single thread at a time. |
| class QUIC_EXPORT_PRIVATE QuicCryptoClientConfig : public QuicCryptoConfig { |
| public: |
| // A CachedState contains the information that the client needs in order to |
| // perform a 0-RTT handshake with a server. This information can be reused |
| // over several connections to the same server. |
| class QUIC_EXPORT_PRIVATE CachedState { |
| public: |
| // Enum to track if the server config is valid or not. If it is not valid, |
| // it specifies why it is invalid. |
| enum ServerConfigState { |
| // WARNING: Do not change the numerical values of any of server config |
| // state. Do not remove deprecated server config states - just comment |
| // them as deprecated. |
| SERVER_CONFIG_EMPTY = 0, |
| SERVER_CONFIG_INVALID = 1, |
| SERVER_CONFIG_CORRUPTED = 2, |
| SERVER_CONFIG_EXPIRED = 3, |
| SERVER_CONFIG_INVALID_EXPIRY = 4, |
| SERVER_CONFIG_VALID = 5, |
| // NOTE: Add new server config states only immediately above this line. |
| // Make sure to update the QuicServerConfigState enum in |
| // tools/metrics/histograms/histograms.xml accordingly. |
| SERVER_CONFIG_COUNT |
| }; |
| |
| CachedState(); |
| CachedState(const CachedState&) = delete; |
| CachedState& operator=(const CachedState&) = delete; |
| ~CachedState(); |
| |
| // IsComplete returns true if this object contains enough information to |
| // perform a handshake with the server. |now| is used to judge whether any |
| // cached server config has expired. |
| bool IsComplete(QuicWallTime now) const; |
| |
| // IsEmpty returns true if |server_config_| is empty. |
| bool IsEmpty() const; |
| |
| // GetServerConfig returns the parsed contents of |server_config|, or |
| // nullptr if |server_config| is empty. The return value is owned by this |
| // object and is destroyed when this object is. |
| const CryptoHandshakeMessage* GetServerConfig() const; |
| |
| // SetServerConfig checks that |server_config| parses correctly and stores |
| // it in |server_config_|. |now| is used to judge whether |server_config| |
| // has expired. |
| ServerConfigState SetServerConfig(absl::string_view server_config, |
| QuicWallTime now, |
| QuicWallTime expiry_time, |
| std::string* error_details); |
| |
| // InvalidateServerConfig clears the cached server config (if any). |
| void InvalidateServerConfig(); |
| |
| // SetProof stores a cert chain, cert signed timestamp and signature. |
| void SetProof(const std::vector<std::string>& certs, |
| absl::string_view cert_sct, |
| absl::string_view chlo_hash, |
| absl::string_view signature); |
| |
| // Clears all the data. |
| void Clear(); |
| |
| // Clears the certificate chain and signature and invalidates the proof. |
| void ClearProof(); |
| |
| // SetProofValid records that the certificate chain and signature have been |
| // validated and that it's safe to assume that the server is legitimate. |
| // (Note: this does not check the chain or signature.) |
| void SetProofValid(); |
| |
| // If the server config or the proof has changed then it needs to be |
| // revalidated. Helper function to keep server_config_valid_ and |
| // generation_counter_ in sync. |
| void SetProofInvalid(); |
| |
| const std::string& server_config() const; |
| const std::string& source_address_token() const; |
| const std::vector<std::string>& certs() const; |
| const std::string& cert_sct() const; |
| const std::string& chlo_hash() const; |
| const std::string& signature() const; |
| bool proof_valid() const; |
| uint64_t generation_counter() const; |
| const ProofVerifyDetails* proof_verify_details() const; |
| |
| void set_source_address_token(absl::string_view token); |
| |
| void set_cert_sct(absl::string_view cert_sct); |
| |
| // SetProofVerifyDetails takes ownership of |details|. |
| void SetProofVerifyDetails(ProofVerifyDetails* details); |
| |
| // Copy the |server_config_|, |source_address_token_|, |certs_|, |
| // |expiration_time_|, |cert_sct_|, |chlo_hash_| and |server_config_sig_| |
| // from the |other|. The remaining fields, |generation_counter_|, |
| // |proof_verify_details_|, and |scfg_| remain unchanged. |
| void InitializeFrom(const CachedState& other); |
| |
| // Initializes this cached state based on the arguments provided. |
| // Returns false if there is a problem parsing the server config. |
| bool Initialize(absl::string_view server_config, |
| absl::string_view source_address_token, |
| const std::vector<std::string>& certs, |
| const std::string& cert_sct, |
| absl::string_view chlo_hash, |
| absl::string_view signature, |
| QuicWallTime now, |
| QuicWallTime expiration_time); |
| |
| private: |
| std::string server_config_; // A serialized handshake message. |
| std::string source_address_token_; // An opaque proof of IP ownership. |
| std::vector<std::string> certs_; // A list of certificates in leaf-first |
| // order. |
| std::string cert_sct_; // Signed timestamp of the leaf cert. |
| std::string chlo_hash_; // Hash of the CHLO message. |
| std::string server_config_sig_; // A signature of |server_config_|. |
| bool server_config_valid_; // True if |server_config_| is correctly |
| // signed and |certs_| has been validated. |
| QuicWallTime expiration_time_; // Time when the config is no longer valid. |
| // Generation counter associated with the |server_config_|, |certs_| and |
| // |server_config_sig_| combination. It is incremented whenever we set |
| // server_config_valid_ to false. |
| uint64_t generation_counter_; |
| |
| std::unique_ptr<ProofVerifyDetails> proof_verify_details_; |
| |
| // scfg contains the cached, parsed value of |server_config|. |
| mutable std::unique_ptr<CryptoHandshakeMessage> scfg_; |
| }; |
| |
| // Used to filter server ids for partial config deletion. |
| class QUIC_EXPORT_PRIVATE ServerIdFilter { |
| public: |
| virtual ~ServerIdFilter() {} |
| |
| // Returns true if |server_id| matches the filter. |
| virtual bool Matches(const QuicServerId& server_id) const = 0; |
| }; |
| |
| // DEPRECATED: Use the constructor below instead. |
| explicit QuicCryptoClientConfig( |
| std::unique_ptr<ProofVerifier> proof_verifier); |
| QuicCryptoClientConfig(std::unique_ptr<ProofVerifier> proof_verifier, |
| std::unique_ptr<SessionCache> session_cache); |
| QuicCryptoClientConfig(const QuicCryptoClientConfig&) = delete; |
| QuicCryptoClientConfig& operator=(const QuicCryptoClientConfig&) = delete; |
| ~QuicCryptoClientConfig(); |
| |
| // LookupOrCreate returns a CachedState for the given |server_id|. If no such |
| // CachedState currently exists, it will be created and cached. |
| CachedState* LookupOrCreate(const QuicServerId& server_id); |
| |
| // Delete CachedState objects whose server ids match |filter| from |
| // cached_states. |
| void ClearCachedStates(const ServerIdFilter& filter); |
| |
| // FillInchoateClientHello sets |out| to be a CHLO message that elicits a |
| // source-address token or SCFG from a server. If |cached| is non-nullptr, the |
| // source-address token will be taken from it. |out_params| is used in order |
| // to store the cached certs that were sent as hints to the server in |
| // |out_params->cached_certs|. |preferred_version| is the version of the |
| // QUIC protocol that this client chose to use initially. This allows the |
| // server to detect downgrade attacks. If |demand_x509_proof| is true, |
| // then |out| will include an X509 proof demand, and the associated |
| // certificate related fields. |
| void FillInchoateClientHello( |
| const QuicServerId& server_id, |
| const ParsedQuicVersion preferred_version, |
| const CachedState* cached, |
| QuicRandom* rand, |
| bool demand_x509_proof, |
| QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params, |
| CryptoHandshakeMessage* out) const; |
| |
| // FillClientHello sets |out| to be a CHLO message based on the configuration |
| // of this object. This object must have cached enough information about |
| // the server's hostname in order to perform a handshake. This can be checked |
| // with the |IsComplete| member of |CachedState|. |
| // |
| // |now| and |rand| are used to generate the nonce and |out_params| is |
| // filled with the results of the handshake that the server is expected to |
| // accept. |preferred_version| is the version of the QUIC protocol that this |
| // client chose to use initially. This allows the server to detect downgrade |
| // attacks. |
| // |
| // If |channel_id_key| is not null, it is used to sign a secret value derived |
| // from the client and server's keys, and the Channel ID public key and the |
| // signature are placed in the CETV value of the CHLO. |
| QuicErrorCode FillClientHello( |
| const QuicServerId& server_id, |
| QuicConnectionId connection_id, |
| const ParsedQuicVersion preferred_version, |
| const ParsedQuicVersion actual_version, |
| const CachedState* cached, |
| QuicWallTime now, |
| QuicRandom* rand, |
| QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params, |
| CryptoHandshakeMessage* out, |
| std::string* error_details) const; |
| |
| // ProcessRejection processes a REJ message from a server and updates the |
| // cached information about that server. After this, |IsComplete| may return |
| // true for that server's CachedState. If the rejection message contains state |
| // about a future handshake (i.e. an nonce value from the server), then it |
| // will be saved in |out_params|. |now| is used to judge whether the server |
| // config in the rejection message has expired. |
| QuicErrorCode ProcessRejection( |
| const CryptoHandshakeMessage& rej, |
| QuicWallTime now, |
| QuicTransportVersion version, |
| absl::string_view chlo_hash, |
| CachedState* cached, |
| QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params, |
| std::string* error_details); |
| |
| // ProcessServerHello processes the message in |server_hello|, updates the |
| // cached information about that server, writes the negotiated parameters to |
| // |out_params| and returns QUIC_NO_ERROR. If |server_hello| is unacceptable |
| // then it puts an error message in |error_details| and returns an error |
| // code. |version| is the QUIC version for the current connection. |
| // |negotiated_versions| contains the list of version, if any, that were |
| // present in a version negotiation packet previously received from the |
| // server. The contents of this list will be compared against the list of |
| // versions provided in the VER tag of the server hello. |
| QuicErrorCode ProcessServerHello( |
| const CryptoHandshakeMessage& server_hello, |
| QuicConnectionId connection_id, |
| ParsedQuicVersion version, |
| const ParsedQuicVersionVector& negotiated_versions, |
| CachedState* cached, |
| QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params, |
| std::string* error_details); |
| |
| // Processes the message in |server_update|, updating the cached source |
| // address token, and server config. |
| // If |server_update| is invalid then |error_details| will contain an error |
| // message, and an error code will be returned. If all has gone well |
| // QUIC_NO_ERROR is returned. |
| QuicErrorCode ProcessServerConfigUpdate( |
| const CryptoHandshakeMessage& server_update, |
| QuicWallTime now, |
| const QuicTransportVersion version, |
| absl::string_view chlo_hash, |
| CachedState* cached, |
| QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params, |
| std::string* error_details); |
| |
| ProofVerifier* proof_verifier() const; |
| SessionCache* session_cache() const; |
| ProofSource* proof_source() const; |
| void set_proof_source(std::unique_ptr<ProofSource> proof_source); |
| SSL_CTX* ssl_ctx() const; |
| |
| // Initialize the CachedState from |canonical_crypto_config| for the |
| // |canonical_server_id| as the initial CachedState for |server_id|. We will |
| // copy config data only if |canonical_crypto_config| has valid proof. |
| void InitializeFrom(const QuicServerId& server_id, |
| const QuicServerId& canonical_server_id, |
| QuicCryptoClientConfig* canonical_crypto_config); |
| |
| // Adds |suffix| as a domain suffix for which the server's crypto config |
| // is expected to be shared among servers with the domain suffix. If a server |
| // matches this suffix, then the server config from another server with the |
| // suffix will be used to initialize the cached state for this server. |
| void AddCanonicalSuffix(const std::string& suffix); |
| |
| // Saves the |user_agent_id| that will be passed in QUIC's CHLO message. |
| void set_user_agent_id(const std::string& user_agent_id) { |
| user_agent_id_ = user_agent_id; |
| } |
| |
| // Returns the user_agent_id that will be provided in the client hello |
| // handshake message. |
| const std::string& user_agent_id() const { return user_agent_id_; } |
| |
| // Saves the |alpn| that will be passed in QUIC's CHLO message. |
| void set_alpn(const std::string& alpn) { alpn_ = alpn; } |
| |
| // Saves the pre-shared key used during the handshake. |
| void set_pre_shared_key(absl::string_view psk) { |
| pre_shared_key_ = std::string(psk); |
| } |
| |
| // Returns the pre-shared key used during the handshake. |
| const std::string& pre_shared_key() const { return pre_shared_key_; } |
| |
| bool pad_inchoate_hello() const { return pad_inchoate_hello_; } |
| void set_pad_inchoate_hello(bool new_value) { |
| pad_inchoate_hello_ = new_value; |
| } |
| |
| bool pad_full_hello() const { return pad_full_hello_; } |
| void set_pad_full_hello(bool new_value) { pad_full_hello_ = new_value; } |
| |
| private: |
| // Sets the members to reasonable, default values. |
| void SetDefaults(); |
| |
| // CacheNewServerConfig checks for SCFG, STK, PROF, and CRT tags in |message|, |
| // verifies them, and stores them in the cached state if they validate. |
| // This is used on receipt of a REJ from a server, or when a server sends |
| // updated server config during a connection. |
| QuicErrorCode CacheNewServerConfig( |
| const CryptoHandshakeMessage& message, |
| QuicWallTime now, |
| QuicTransportVersion version, |
| absl::string_view chlo_hash, |
| const std::vector<std::string>& cached_certs, |
| CachedState* cached, |
| std::string* error_details); |
| |
| // If the suffix of the hostname in |server_id| is in |canonical_suffixes_|, |
| // then populate |cached| with the canonical cached state from |
| // |canonical_server_map_| for that suffix. Returns true if |cached| is |
| // initialized with canonical cached state. |
| bool PopulateFromCanonicalConfig(const QuicServerId& server_id, |
| CachedState* cached); |
| |
| // cached_states_ maps from the server_id to the cached information about |
| // that server. |
| std::map<QuicServerId, std::unique_ptr<CachedState>> cached_states_; |
| |
| // Contains a map of servers which could share the same server config. Map |
| // from a canonical host suffix/port/scheme to a representative server with |
| // the canonical suffix, which has a plausible set of initial certificates |
| // (or at least server public key). |
| std::map<QuicServerId, QuicServerId> canonical_server_map_; |
| |
| // Contains list of suffixes (for exmaple ".c.youtube.com", |
| // ".googlevideo.com") of canonical hostnames. |
| std::vector<std::string> canonical_suffixes_; |
| |
| std::unique_ptr<ProofVerifier> proof_verifier_; |
| std::unique_ptr<SessionCache> session_cache_; |
| std::unique_ptr<ProofSource> proof_source_; |
| |
| bssl::UniquePtr<SSL_CTX> ssl_ctx_; |
| |
| // The |user_agent_id_| passed in QUIC's CHLO message. |
| std::string user_agent_id_; |
| |
| // The |alpn_| passed in QUIC's CHLO message. |
| std::string alpn_; |
| |
| // If non-empty, the client will operate in the pre-shared key mode by |
| // incorporating |pre_shared_key_| into the key schedule. |
| std::string pre_shared_key_; |
| |
| // In QUIC, technically, client hello should be fully padded. |
| // However, fully padding on slow network connection (e.g. 50kbps) can add |
| // 150ms latency to one roundtrip. Therefore, you can disable padding of |
| // individual messages. It is recommend to leave at least one message in |
| // each direction fully padded (e.g. full CHLO and SHLO), but if you know |
| // the lower-bound MTU, you don't need to pad all of them (keep in mind that |
| // it's not OK to do it according to the standard). |
| // |
| // Also, if you disable padding, you must disable (change) the |
| // anti-amplification protection. You should only do so if you have some |
| // other means of verifying the client. |
| bool pad_inchoate_hello_ = true; |
| bool pad_full_hello_ = true; |
| }; |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_CORE_CRYPTO_QUIC_CRYPTO_CLIENT_CONFIG_H_ |