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Diffstat (limited to '')
| -rw-r--r-- | security/nss/lib/ssl/tls13ech.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/security/nss/lib/ssl/tls13ech.h b/security/nss/lib/ssl/tls13ech.h new file mode 100644 index 0000000000..90b674e40d --- /dev/null +++ b/security/nss/lib/ssl/tls13ech.h @@ -0,0 +1,125 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is PRIVATE to SSL. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef __tls13ech_h_ +#define __tls13ech_h_ + +#include "pk11hpke.h" + +/* draft-09, supporting shared-mode and split-mode as a backend server only. + * Notes on the implementation status: + * - Padding (https://tools.ietf.org/html/draft-ietf-tls-esni-08#section-6.2), + * is not implemented (see bug 1677181). + * - When multiple ECHConfigs are provided by the server, the first compatible + * config is selected by the client. Ciphersuite choices are limited and only + * the AEAD may vary (AES-128-GCM or ChaCha20Poly1305). + * - Some of the buffering (construction/compression/decompression) could likely + * be optimized, but the spec is still evolving so that work is deferred. + */ +#define TLS13_ECH_VERSION 0xfe0d +#define TLS13_ECH_SIGNAL_LEN 8 +#define TLS13_ECH_AEAD_TAG_LEN 16 + +static const char kHpkeInfoEch[] = "tls ech"; +static const char hHkdfInfoEchConfigID[] = "tls ech config id"; +static const char kHkdfInfoEchConfirm[] = "ech accept confirmation"; +static const char kHkdfInfoEchHrrConfirm[] = "hrr ech accept confirmation"; + +typedef enum { + ech_xtn_type_outer = 0, + ech_xtn_type_inner = 1, +} EchXtnType; + +struct sslEchConfigContentsStr { + PRUint8 configId; + HpkeKemId kemId; + SECItem publicKey; /* NULL on server. Use the keypair in sslEchConfig instead. */ + HpkeKdfId kdfId; + HpkeAeadId aeadId; + SECItem suites; /* One or more HpkeCipherSuites. The selected s + * suite is placed in kdfId and aeadId. */ + PRUint8 maxNameLen; + char *publicName; + /* No supported extensions. */ +}; + +/* ECH Information needed by a server to process a second CH after a + * HelloRetryRequest is sent. This data is stored in the cookie. + */ +struct sslEchCookieDataStr { + PRBool previouslyOffered; + PRUint8 configId; + HpkeKdfId kdfId; + HpkeAeadId aeadId; + HpkeContext *hpkeCtx; + PRUint8 signal[TLS13_ECH_SIGNAL_LEN]; +}; + +struct sslEchConfigStr { + PRCList link; + SECItem raw; + PRUint16 version; + sslEchConfigContents contents; +}; + +struct sslEchXtnStateStr { + SECItem innerCh; /* Server: ClientECH.payload */ + SECItem senderPubKey; /* Server: ClientECH.enc */ + PRUint8 configId; /* Server: ClientECH.config_id */ + HpkeKdfId kdfId; /* Server: ClientECH.cipher_suite.kdf */ + HpkeAeadId aeadId; /* Server: ClientECH.cipher_suite.aead */ + SECItem retryConfigs; /* Client: ServerECH.retry_configs*/ + PRBool retryConfigsValid; /* Client: Extraction of retry_configss is allowed. + * This is set once the handshake completes (having + * verified to the ECHConfig public name). */ + PRUint8 *hrrConfirmation; /* Client/Server: HRR Confirmation Location */ + PRBool receivedInnerXtn; /* Server: Handled ECH Xtn with Inner Enum */ + PRUint8 *payloadStart; /* Server: Start of ECH Payload*/ +}; + +SEC_BEGIN_PROTOS + +SECStatus SSLExp_EncodeEchConfigId(PRUint8 configId, const char *publicName, unsigned int maxNameLen, + HpkeKemId kemId, const SECKEYPublicKey *pubKey, + const HpkeSymmetricSuite *hpkeSuites, unsigned int hpkeSuiteCount, + PRUint8 *out, unsigned int *outlen, unsigned int maxlen); +SECStatus SSLExp_GetEchRetryConfigs(PRFileDesc *fd, SECItem *retryConfigs); +SECStatus SSLExp_SetClientEchConfigs(PRFileDesc *fd, const PRUint8 *echConfigs, + unsigned int echConfigsLen); +SECStatus SSLExp_SetServerEchConfigs(PRFileDesc *fd, + const SECKEYPublicKey *pubKey, const SECKEYPrivateKey *privKey, + const PRUint8 *echConfigs, unsigned int numEchConfigs); +SECStatus SSLExp_RemoveEchConfigs(PRFileDesc *fd); + +SEC_END_PROTOS + +SECStatus tls13_ClientSetupEch(sslSocket *ss, sslClientHelloType type); +SECStatus tls13_ConstructClientHelloWithEch(sslSocket *ss, const sslSessionID *sid, + PRBool freshSid, sslBuffer *chOuterBuf, + sslBuffer *chInnerXtnsBuf); +SECStatus tls13_CopyEchConfigs(PRCList *oconfigs, PRCList *configs); +SECStatus tls13_DecodeEchConfigs(const SECItem *data, PRCList *configs); +void tls13_DestroyEchConfigs(PRCList *list); +void tls13_DestroyEchXtnState(sslEchXtnState *state); +SECStatus tls13_GetMatchingEchConfig(const sslSocket *ss, HpkeKdfId kdf, HpkeAeadId aead, + const SECItem *configId, sslEchConfig **cfg); +SECStatus tls13_MaybeHandleEch(sslSocket *ss, const PRUint8 *msg, PRUint32 msgLen, SECItem *sidBytes, + SECItem *comps, SECItem *cookieBytes, SECItem *suites, SECItem **echInner); +SECStatus tls13_MaybeHandleEchSignal(sslSocket *ss, const PRUint8 *savedMsg, PRUint32 savedLength, PRBool isHrr); +SECStatus tls13_MaybeAcceptEch(sslSocket *ss, const SECItem *sidBytes, const PRUint8 *chOuter, + unsigned int chOuterLen, SECItem **chInner); +SECStatus tls13_MaybeGreaseEch(sslSocket *ss, const sslBuffer *preamble, sslBuffer *buf); +SECStatus tls13_WriteServerEchSignal(sslSocket *ss, PRUint8 *sh, unsigned int shLen); +SECStatus tls13_WriteServerEchHrrSignal(sslSocket *ss, PRUint8 *sh, unsigned int shLen); +SECStatus tls13_DeriveEchSecret(const sslSocket *ss, PK11SymKey **output); +SECStatus tls13_ComputeEchSignal(sslSocket *ss, PRBool isHrr, const PRUint8 *sh, unsigned int shLen, PRUint8 *out); + +PRBool tls13_IsIp(const PRUint8 *str, unsigned int len); +PRBool tls13_IsLDH(const PRUint8 *str, unsigned int len); + +#endif |