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948c656c66
- Adds an RX time field to the OSSL_QRX_PKT structure. - Adds a timekeeping argument to ossl_demux_new which is used to determine packet reception time. - Adds a decoded PN field to the OSSL_QRX_PKT structure. This has to be decoded by the QRX anyway, and its omission was an oversight. - Key update support for the TX side. - Minor refactoring. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/18949)
151 lines
5.5 KiB
C
151 lines
5.5 KiB
C
/*
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* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_QUIC_RECORD_SHARED_H
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# define OSSL_QUIC_RECORD_SHARED_H
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# include <openssl/ssl.h>
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# include "internal/quic_types.h"
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# include "internal/quic_wire_pkt.h"
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/*
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* QUIC Record Layer EL Management Utilities
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* =========================================
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*
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* This defines a structure for managing the cryptographic state at a given
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* encryption level, as this functionality is shared between QRX and QTX. For
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* QRL use only.
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*/
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/*
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* States an EL can be in. The Updating and Cooldown states are used by RX only;
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* a TX EL in the Provisioned state is always in the Normal substate.
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*
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* Key material is available if in the Provisioned state.
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*/
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#define QRL_EL_STATE_UNPROV 0 /* Unprovisioned (initial state) */
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#define QRL_EL_STATE_PROV_NORMAL 1 /* Provisioned - Normal */
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#define QRL_EL_STATE_PROV_UPDATING 2 /* Provisioned - Updating */
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#define QRL_EL_STATE_PROV_COOLDOWN 3 /* Provisioned - Cooldown */
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#define QRL_EL_STATE_DISCARDED 4 /* Discarded (terminal state) */
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typedef struct ossl_qrl_enc_level_st {
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/*
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* Cryptographic context used to apply and remove header protection from
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* packet headers.
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*/
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QUIC_HDR_PROTECTOR hpr;
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/* Hash function used for key derivation. */
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EVP_MD *md;
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/* Context used for packet body ciphering. One for each keyslot. */
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EVP_CIPHER_CTX *cctx[2];
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OSSL_LIB_CTX *libctx;
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const char *propq;
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/*
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* Key epoch, essentially the number of times we have done a key update.
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*
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* The least significant bit of this is therefore by definition the current
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* Key Phase bit value.
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*/
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uint64_t key_epoch;
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/* Usage counter. The caller maintains this. Used by TX side only. */
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uint64_t op_count;
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/* QRL_SUITE_* value. */
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uint32_t suite_id;
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/* Length of authentication tag. */
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uint32_t tag_len;
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/* Current EL state. */
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unsigned char state; /* QRL_EL_STATE_* */
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/* 1 if for TX, else RX. Initialised when secret provided. */
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unsigned char is_tx;
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/* IV used to construct nonces used for AEAD packet body ciphering. */
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unsigned char iv[2][EVP_MAX_IV_LENGTH];
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/*
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* Secret for next key epoch.
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*/
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unsigned char ku[EVP_MAX_KEY_LENGTH];
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} OSSL_QRL_ENC_LEVEL;
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typedef struct ossl_qrl_enc_level_set_st {
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OSSL_QRL_ENC_LEVEL el[QUIC_ENC_LEVEL_NUM];
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} OSSL_QRL_ENC_LEVEL_SET;
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/*
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* Returns 1 if we have key material for a given encryption level (that is, if
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* we are in the PROVISIONED state), 0 if we do not yet have material (we are in
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* the UNPROVISIONED state) and -1 if the EL is discarded (we are in the
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* DISCARDED state).
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*/
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int ossl_qrl_enc_level_set_have_el(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level);
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/*
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* Returns EL in a set. If enc_level is not a valid QUIC_ENC_LEVEL_* value,
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* returns NULL. If require_prov is 1, returns NULL if the EL is not in
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* the PROVISIONED state; otherwise, the returned EL may be in any state.
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*/
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OSSL_QRL_ENC_LEVEL *ossl_qrl_enc_level_set_get(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level,
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int require_prov);
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/* Provide secret to an EL. md may be NULL. */
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int ossl_qrl_enc_level_set_provide_secret(OSSL_QRL_ENC_LEVEL_SET *els,
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OSSL_LIB_CTX *libctx,
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const char *propq,
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uint32_t enc_level,
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uint32_t suite_id,
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EVP_MD *md,
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const unsigned char *secret,
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size_t secret_len,
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unsigned char init_key_phase_bit,
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int is_tx);
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/*
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* Returns 1 if the given keyslot index is currently valid for a given EL and EL
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* state.
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*/
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int ossl_qrl_enc_level_set_has_keyslot(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level,
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unsigned char tgt_state,
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size_t keyslot);
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/* Perform a key update. Transitions from PROV_NORMAL to PROV_UPDATING. */
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int ossl_qrl_enc_level_set_key_update(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level);
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/* Transitions from PROV_UPDATING to PROV_COOLDOWN. */
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int ossl_qrl_enc_level_set_key_update_done(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level);
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/*
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* Transitions from PROV_COOLDOWN to PROV_NORMAL. (If in PROV_UPDATING,
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* auto-transitions to PROV_COOLDOWN first.)
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*/
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int ossl_qrl_enc_level_set_key_cooldown_done(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level);
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/*
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* Discard an EL. No secret can be provided for the EL ever again.
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*/
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void ossl_qrl_enc_level_set_discard(OSSL_QRL_ENC_LEVEL_SET *els,
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uint32_t enc_level);
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#endif
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