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QUIC: refactored key handling.

Browse Source 
All key handling functionality is moved into ngx_quic_protection.c.
Public structures from ngx_quic_protection.h are now private and new
methods are available to manipulate keys.

A negotiated cipher is cached in QUIC connection from the set secret callback
to avoid calling SSL_get_current_cipher() on each encrypt/decrypt operation.
This also reduces the number of unwanted c->ssl->connection occurrences.
This commit is contained in:
Sergey Kandaurov 2020-11-02 18:21:34 +03:00
parent 8ed020db75
commit 0aef8438f4
5 changed files with 193 additions and 169 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

128
src/event/ngx_event_quic.c
View File

@ -94,9 +94,6 @@ typedef struct {
* are also Initial packets. * are also Initial packets.
*/ */
typedef struct { typedef struct {
ngx_quic_secret_t client_secret;
ngx_quic_secret_t server_secret;
enum ssl_encryption_level_t level; enum ssl_encryption_level_t level;
uint64_t pnum; /* to be sent */ uint64_t pnum; /* to be sent */
@ -134,10 +131,11 @@ struct ngx_quic_connection_s {
ngx_quic_tp_t ctp; ngx_quic_tp_t ctp;
ngx_quic_send_ctx_t send_ctx[NGX_QUIC_SEND_CTX_LAST]; ngx_quic_send_ctx_t send_ctx[NGX_QUIC_SEND_CTX_LAST];
ngx_quic_secrets_t keys[NGX_QUIC_ENCRYPTION_LAST];
ngx_quic_secrets_t next_key;
ngx_quic_frames_stream_t crypto[NGX_QUIC_ENCRYPTION_LAST]; ngx_quic_frames_stream_t crypto[NGX_QUIC_ENCRYPTION_LAST];
ngx_quic_keys_t *keys;
ngx_quic_conf_t *conf; ngx_quic_conf_t *conf;
ngx_event_t push; ngx_event_t push;
@ -643,8 +641,7 @@ ngx_quic_set_read_secret(ngx_ssl_conn_t *ssl_conn,
enum ssl_encryption_level_t level, const SSL_CIPHER *cipher, enum ssl_encryption_level_t level, const SSL_CIPHER *cipher,
const uint8_t *rsecret, size_t secret_len) const uint8_t *rsecret, size_t secret_len)
{ {
ngx_connection_t *c; ngx_connection_t *c;
ngx_quic_secrets_t *keys;
c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn); c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn);
@ -654,11 +651,8 @@ ngx_quic_set_read_secret(ngx_ssl_conn_t *ssl_conn,
ngx_quic_hexdump(c->log, "quic read secret", rsecret, secret_len); ngx_quic_hexdump(c->log, "quic read secret", rsecret, secret_len);
#endif #endif
keys = &c->quic->keys[level]; return ngx_quic_keys_set_encryption_secret(c->pool, 0, c->quic->keys, level,
cipher, rsecret, secret_len);
return ngx_quic_set_encryption_secret(c->pool, ssl_conn, level,
rsecret, secret_len,
&keys->client);
} }
@ -667,8 +661,7 @@ ngx_quic_set_write_secret(ngx_ssl_conn_t *ssl_conn,
enum ssl_encryption_level_t level, const SSL_CIPHER *cipher, enum ssl_encryption_level_t level, const SSL_CIPHER *cipher,
const uint8_t *wsecret, size_t secret_len) const uint8_t *wsecret, size_t secret_len)
{ {
ngx_connection_t *c; ngx_connection_t *c;
ngx_quic_secrets_t *keys;
c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn); c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn);
@ -678,11 +671,8 @@ ngx_quic_set_write_secret(ngx_ssl_conn_t *ssl_conn,
ngx_quic_hexdump(c->log, "quic write secret", wsecret, secret_len); ngx_quic_hexdump(c->log, "quic write secret", wsecret, secret_len);
#endif #endif
keys = &c->quic->keys[level]; return ngx_quic_keys_set_encryption_secret(c->pool, 1, c->quic->keys, level,
cipher, wsecret, secret_len);
return ngx_quic_set_encryption_secret(c->pool, ssl_conn, level,
wsecret, secret_len,
&keys->server);
} }
#else #else
@ -692,25 +682,24 @@ ngx_quic_set_encryption_secrets(ngx_ssl_conn_t *ssl_conn,
enum ssl_encryption_level_t level, const uint8_t *rsecret, enum ssl_encryption_level_t level, const uint8_t *rsecret,
const uint8_t *wsecret, size_t secret_len) const uint8_t *wsecret, size_t secret_len)
{ {
ngx_int_t rc; ngx_connection_t *c;
ngx_connection_t *c; const SSL_CIPHER *cipher;
ngx_quic_secrets_t *keys;
c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn); c = ngx_ssl_get_connection((ngx_ssl_conn_t *) ssl_conn);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic ngx_quic_set_encryption_secrets() level:%d", level); "quic ngx_quic_set_encryption_secrets() level:%d", level);
#ifdef NGX_QUIC_DEBUG_CRYPTO #ifdef NGX_QUIC_DEBUG_CRYPTO
ngx_quic_hexdump(c->log, "quic read", rsecret, secret_len); ngx_quic_hexdump(c->log, "quic read secret", rsecret, secret_len);
#endif #endif
keys = &c->quic->keys[level]; cipher = SSL_get_current_cipher(ssl_conn);
rc = ngx_quic_set_encryption_secret(c->pool, ssl_conn, level, if (ngx_quic_keys_set_encryption_secret(c->pool, 0, c->quic->keys, level,
rsecret, secret_len, cipher, rsecret, secret_len)
&keys->client); != 1)
if (rc != 1) { {
return rc; return 0;
} }
if (level == ssl_encryption_early_data) { if (level == ssl_encryption_early_data) {
@ -718,12 +707,11 @@ ngx_quic_set_encryption_secrets(ngx_ssl_conn_t *ssl_conn,
} }
#ifdef NGX_QUIC_DEBUG_CRYPTO #ifdef NGX_QUIC_DEBUG_CRYPTO
ngx_quic_hexdump(c->log, "quic write", wsecret, secret_len); ngx_quic_hexdump(c->log, "quic write secret", wsecret, secret_len);
#endif #endif
return ngx_quic_set_encryption_secret(c->pool, ssl_conn, level, return ngx_quic_keys_set_encryption_secret(c->pool, 1, c->quic->keys, level,
wsecret, secret_len, cipher, wsecret, secret_len);
&keys->server);
} }
#endif #endif
@ -965,6 +953,11 @@ ngx_quic_new_connection(ngx_connection_t *c, ngx_quic_conf_t *conf,
return NULL; return NULL;
} }
qc->keys = ngx_quic_keys_new(c->pool);
if (qc->keys == NULL) {
return NULL;
}
ngx_rbtree_init(&qc->streams.tree, &qc->streams.sentinel, ngx_rbtree_init(&qc->streams.tree, &qc->streams.sentinel,
ngx_quic_rbtree_insert_stream); ngx_quic_rbtree_insert_stream);
@ -1239,7 +1232,7 @@ ngx_quic_send_retry(ngx_connection_t *c)
res.data = buf; res.data = buf;
if (ngx_quic_encrypt(&pkt, NULL, &res) != NGX_OK) { if (ngx_quic_encrypt(&pkt, &res) != NGX_OK) {
return NGX_ERROR; return NGX_ERROR;
} }
@ -1990,8 +1983,6 @@ ngx_quic_process_packet(ngx_connection_t *c, ngx_quic_conf_t *conf,
ngx_quic_header_t *pkt) ngx_quic_header_t *pkt)
{ {
ngx_int_t rc; ngx_int_t rc;
ngx_ssl_conn_t *ssl_conn;
ngx_quic_secrets_t *keys, *next, tmp;
ngx_quic_send_ctx_t *ctx; ngx_quic_send_ctx_t *ctx;
ngx_quic_connection_t *qc; ngx_quic_connection_t *qc;
@ -2135,26 +2126,19 @@ ngx_quic_process_packet(ngx_connection_t *c, ngx_quic_conf_t *conf,
c->log->action = "decrypting packet"; c->log->action = "decrypting packet";
keys = &qc->keys[pkt->level]; if (!ngx_quic_keys_available(qc->keys, pkt->level)) {
if (keys->client.key.len == 0) {
ngx_log_error(NGX_LOG_INFO, c->log, 0, ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic no level %d keys yet, ignoring packet", pkt->level); "quic no level %d keys yet, ignoring packet", pkt->level);
return NGX_DECLINED; return NGX_DECLINED;
} }
next = &qc->next_key; pkt->keys = qc->keys;
pkt->secret = &keys->client;
pkt->next = &next->client;
pkt->key_phase = qc->key_phase; pkt->key_phase = qc->key_phase;
pkt->plaintext = buf; pkt->plaintext = buf;
ctx = ngx_quic_get_send_ctx(qc, pkt->level); ctx = ngx_quic_get_send_ctx(qc, pkt->level);
ssl_conn = c->ssl ? c->ssl->connection : NULL; rc = ngx_quic_decrypt(pkt, &ctx->largest_pn);
rc = ngx_quic_decrypt(pkt, ssl_conn, &ctx->largest_pn);
if (rc != NGX_OK) { if (rc != NGX_OK) {
qc->error = pkt->error; qc->error = pkt->error;
qc->error_reason = "failed to decrypt packet"; qc->error_reason = "failed to decrypt packet";
@ -2190,44 +2174,32 @@ ngx_quic_process_packet(ngx_connection_t *c, ngx_quic_conf_t *conf,
return ngx_quic_payload_handler(c, pkt); return ngx_quic_payload_handler(c, pkt);
} }
/* switch keys on Key Phase change */ if (!pkt->key_update) {
return ngx_quic_payload_handler(c, pkt);
if (pkt->key_update) {
qc->key_phase ^= 1;
tmp = *keys;
*keys = *next;
*next = tmp;
} }
/* switch keys and generate next on Key Phase change */
qc->key_phase ^= 1;
ngx_quic_keys_switch(c, qc->keys);
rc = ngx_quic_payload_handler(c, pkt); rc = ngx_quic_payload_handler(c, pkt);
if (rc != NGX_OK) { if (rc != NGX_OK) {
return rc; return rc;
} }
/* generate next keys */ return ngx_quic_keys_update(c, qc->keys);
if (pkt->key_update) {
if (ngx_quic_key_update(c, keys, next) != NGX_OK) {
return NGX_ERROR;
}
}
return NGX_OK;
} }
static ngx_int_t static ngx_int_t
ngx_quic_init_secrets(ngx_connection_t *c) ngx_quic_init_secrets(ngx_connection_t *c)
{ {
ngx_quic_secrets_t *keys;
ngx_quic_connection_t *qc; ngx_quic_connection_t *qc;
qc =c->quic; qc = c->quic;
keys = &qc->keys[ssl_encryption_initial];
if (ngx_quic_set_initial_secret(c->pool, &keys->client, &keys->server, if (ngx_quic_keys_set_initial_secret(c->pool, qc->keys, &qc->odcid)
&qc->odcid)
!= NGX_OK) != NGX_OK)
{ {
return NGX_ERROR; return NGX_ERROR;
@ -2249,11 +2221,12 @@ ngx_quic_discard_ctx(ngx_connection_t *c, enum ssl_encryption_level_t level)
qc = c->quic; qc = c->quic;
if (qc->keys[level].client.key.len == 0) { if (!ngx_quic_keys_available(qc->keys, level)) {
return; return;
} }
qc->keys[level].client.key.len = 0; ngx_quic_keys_discard(qc->keys, level);
qc->pto_count = 0; qc->pto_count = 0;
ctx = ngx_quic_get_send_ctx(qc, level); ctx = ngx_quic_get_send_ctx(qc, level);
@ -3634,10 +3607,7 @@ ngx_quic_crypto_input(ngx_connection_t *c, ngx_quic_frame_t *frame, void *data)
* See quic-tls 9.4 Header Protection Timing Side-Channels. * See quic-tls 9.4 Header Protection Timing Side-Channels.
*/ */
if (ngx_quic_key_update(c, &c->quic->keys[ssl_encryption_application], if (ngx_quic_keys_update(c, c->quic->keys) != NGX_OK) {
&c->quic->next_key)
!= NGX_OK)
{
return NGX_ERROR; return NGX_ERROR;
} }
@ -4503,10 +4473,8 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
ngx_str_t out, res; ngx_str_t out, res;
ngx_msec_t now; ngx_msec_t now;
ngx_queue_t *q; ngx_queue_t *q;
ngx_ssl_conn_t *ssl_conn;
ngx_quic_frame_t *f, *start; ngx_quic_frame_t *f, *start;
ngx_quic_header_t pkt; ngx_quic_header_t pkt;
ngx_quic_secrets_t *keys;
ngx_quic_connection_t *qc; ngx_quic_connection_t *qc;
static u_char src[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE]; static u_char src[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
static u_char dst[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE]; static u_char dst[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
@ -4514,8 +4482,6 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic ngx_quic_send_frames"); "quic ngx_quic_send_frames");
ssl_conn = c->ssl ? c->ssl->connection : NULL;
q = ngx_queue_head(frames); q = ngx_queue_head(frames);
start = ngx_queue_data(q, ngx_quic_frame_t, queue); start = ngx_queue_data(q, ngx_quic_frame_t, queue);
@ -4554,9 +4520,7 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
qc = c->quic; qc = c->quic;
keys = &c->quic->keys[start->level]; pkt.keys = qc->keys;
pkt.secret = &keys->server;
pkt.flags = NGX_QUIC_PKT_FIXED_BIT; pkt.flags = NGX_QUIC_PKT_FIXED_BIT;
@ -4603,7 +4567,7 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
ngx_quic_level_name(start->level), out.len, pkt.need_ack, ngx_quic_level_name(start->level), out.len, pkt.need_ack,
pkt.number, pkt.num_len, pkt.trunc); pkt.number, pkt.num_len, pkt.trunc);
if (ngx_quic_encrypt(&pkt, ssl_conn, &res) != NGX_OK) { if (ngx_quic_encrypt(&pkt, &res) != NGX_OK) {
ngx_quic_free_frames(c, frames); ngx_quic_free_frames(c, frames);
return NGX_ERROR; return NGX_ERROR;
} }

3
src/event/ngx_event_quic.h
View File

@ -116,6 +116,9 @@ struct ngx_quic_stream_s {
}; };
typedef struct ngx_quic_keys_s ngx_quic_keys_t;
void ngx_quic_run(ngx_connection_t *c, ngx_quic_conf_t *conf); void ngx_quic_run(ngx_connection_t *c, ngx_quic_conf_t *conf);
ngx_connection_t *ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi); ngx_connection_t *ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi);
void ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err, void ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err,

186
src/event/ngx_event_quic_protection.c
View File

@ -24,6 +24,7 @@
#define ngx_quic_cipher_t EVP_CIPHER #define ngx_quic_cipher_t EVP_CIPHER
#endif #endif
typedef struct { typedef struct {
const ngx_quic_cipher_t *c; const ngx_quic_cipher_t *c;
const EVP_CIPHER *hp; const EVP_CIPHER *hp;
@ -31,6 +32,27 @@ typedef struct {
} ngx_quic_ciphers_t; } ngx_quic_ciphers_t;
typedef struct ngx_quic_secret_s {
ngx_str_t secret;
ngx_str_t key;
ngx_str_t iv;
ngx_str_t hp;
} ngx_quic_secret_t;
typedef struct {
ngx_quic_secret_t client;
ngx_quic_secret_t server;
} ngx_quic_secrets_t;
struct ngx_quic_keys_s {
ngx_quic_secrets_t secrets[NGX_QUIC_ENCRYPTION_LAST];
ngx_quic_secrets_t next_key;
ngx_uint_t cipher;
};
static ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len, static ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len,
const EVP_MD *digest, const u_char *prk, size_t prk_len, const EVP_MD *digest, const u_char *prk, size_t prk_len,
const u_char *info, size_t info_len); const u_char *info, size_t info_len);
@ -41,7 +63,7 @@ static ngx_int_t ngx_hkdf_extract(u_char *out_key, size_t *out_len,
static uint64_t ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask, static uint64_t ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask,
uint64_t *largest_pn); uint64_t *largest_pn);
static void ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn); static void ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn);
static ngx_int_t ngx_quic_ciphers(ngx_ssl_conn_t *ssl_conn, static ngx_int_t ngx_quic_ciphers(ngx_uint_t id,
ngx_quic_ciphers_t *ciphers, enum ssl_encryption_level_t level); ngx_quic_ciphers_t *ciphers, enum ssl_encryption_level_t level);
static ngx_int_t ngx_quic_tls_open(const ngx_quic_cipher_t *cipher, static ngx_int_t ngx_quic_tls_open(const ngx_quic_cipher_t *cipher,
@ -56,30 +78,21 @@ static ngx_int_t ngx_quic_hkdf_expand(ngx_pool_t *pool, const EVP_MD *digest,
ngx_str_t *out, ngx_str_t *label, const uint8_t *prk, size_t prk_len); ngx_str_t *out, ngx_str_t *label, const uint8_t *prk, size_t prk_len);
static ngx_int_t ngx_quic_create_long_packet(ngx_quic_header_t *pkt, static ngx_int_t ngx_quic_create_long_packet(ngx_quic_header_t *pkt,
ngx_ssl_conn_t *ssl_conn, ngx_str_t *res); ngx_str_t *res);
static ngx_int_t ngx_quic_create_short_packet(ngx_quic_header_t *pkt, static ngx_int_t ngx_quic_create_short_packet(ngx_quic_header_t *pkt,
ngx_ssl_conn_t *ssl_conn, ngx_str_t *res); ngx_str_t *res);
static ngx_int_t ngx_quic_create_retry_packet(ngx_quic_header_t *pkt, static ngx_int_t ngx_quic_create_retry_packet(ngx_quic_header_t *pkt,
ngx_str_t *res); ngx_str_t *res);
static ngx_int_t static ngx_int_t
ngx_quic_ciphers(ngx_ssl_conn_t *ssl_conn, ngx_quic_ciphers_t *ciphers, ngx_quic_ciphers(ngx_uint_t id, ngx_quic_ciphers_t *ciphers,
enum ssl_encryption_level_t level) enum ssl_encryption_level_t level)
{ {
ngx_int_t id, len; ngx_int_t len;
const SSL_CIPHER *cipher;
if (level == ssl_encryption_initial) { if (level == ssl_encryption_initial) {
id = NGX_AES_128_GCM_SHA256; id = NGX_AES_128_GCM_SHA256;
} else {
cipher = SSL_get_current_cipher(ssl_conn);
if (cipher == NULL) {
return NGX_ERROR;
}
id = SSL_CIPHER_get_id(cipher) & 0xffff;
} }
switch (id) { switch (id) {
@ -130,14 +143,15 @@ ngx_quic_ciphers(ngx_ssl_conn_t *ssl_conn, ngx_quic_ciphers_t *ciphers,
ngx_int_t ngx_int_t
ngx_quic_set_initial_secret(ngx_pool_t *pool, ngx_quic_secret_t *client, ngx_quic_keys_set_initial_secret(ngx_pool_t *pool, ngx_quic_keys_t *keys,
ngx_quic_secret_t *server, ngx_str_t *secret) ngx_str_t *secret)
{ {
size_t is_len; size_t is_len;
uint8_t is[SHA256_DIGEST_LENGTH]; uint8_t is[SHA256_DIGEST_LENGTH];
ngx_uint_t i; ngx_uint_t i;
const EVP_MD *digest; const EVP_MD *digest;
const EVP_CIPHER *cipher; const EVP_CIPHER *cipher;
ngx_quic_secret_t *client, *server;
static const uint8_t salt[20] = static const uint8_t salt[20] =
#if (NGX_QUIC_DRAFT_VERSION >= 29) #if (NGX_QUIC_DRAFT_VERSION >= 29)
@ -148,6 +162,9 @@ ngx_quic_set_initial_secret(ngx_pool_t *pool, ngx_quic_secret_t *client,
"\xd2\x43\x2b\xb4\x63\x65\xbe\xf9\xf5\x02"; "\xd2\x43\x2b\xb4\x63\x65\xbe\xf9\xf5\x02";
#endif #endif
client = &keys->secrets[ssl_encryption_initial].client;
server = &keys->secrets[ssl_encryption_initial].server;
/* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.3 */ /* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.3 */
cipher = EVP_aes_128_gcm(); cipher = EVP_aes_128_gcm();
@ -626,16 +643,25 @@ failed:
} }
int int ngx_quic_keys_set_encryption_secret(ngx_pool_t *pool, ngx_uint_t is_write,
ngx_quic_set_encryption_secret(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn, ngx_quic_keys_t *keys, enum ssl_encryption_level_t level,
enum ssl_encryption_level_t level, const uint8_t *secret, const SSL_CIPHER *cipher, const uint8_t *secret, size_t secret_len)
size_t secret_len, ngx_quic_secret_t *peer_secret)
{ {
ngx_int_t key_len; ngx_int_t key_len;
ngx_uint_t i; ngx_uint_t i;
ngx_quic_ciphers_t ciphers; ngx_quic_secret_t *peer_secret;
ngx_quic_ciphers_t ciphers;
key_len = ngx_quic_ciphers(ssl_conn, &ciphers, level); peer_secret = is_write ? &keys->secrets[level].server
: &keys->secrets[level].client;
/*
* SSL_CIPHER_get_protocol_id() is not universally available,
* casting to uint16_t works for both OpenSSL and BoringSSL
*/
keys->cipher = (uint16_t) SSL_CIPHER_get_id(cipher);
key_len = ngx_quic_ciphers(keys->cipher, &ciphers, level);
if (key_len == NGX_ERROR) { if (key_len == NGX_ERROR) {
ngx_ssl_error(NGX_LOG_INFO, pool->log, 0, "unexpected cipher"); ngx_ssl_error(NGX_LOG_INFO, pool->log, 0, "unexpected cipher");
@ -682,17 +708,56 @@ ngx_quic_set_encryption_secret(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
} }
ngx_int_t ngx_quic_keys_t *
ngx_quic_key_update(ngx_connection_t *c, ngx_quic_secrets_t *current, ngx_quic_keys_new(ngx_pool_t *pool)
ngx_quic_secrets_t *next)
{ {
ngx_uint_t i; return ngx_pcalloc(pool, sizeof(ngx_quic_keys_t));
ngx_quic_ciphers_t ciphers; }
ngx_uint_t
ngx_quic_keys_available(ngx_quic_keys_t *keys,
enum ssl_encryption_level_t level)
{
return keys->secrets[level].client.key.len != 0;
}
void
ngx_quic_keys_discard(ngx_quic_keys_t *keys,
enum ssl_encryption_level_t level)
{
keys->secrets[level].client.key.len = 0;
}
void
ngx_quic_keys_switch(ngx_connection_t *c, ngx_quic_keys_t *keys)
{
ngx_quic_secrets_t *current, *next, tmp;
current = &keys->secrets[ssl_encryption_application];
next = &keys->next_key;
tmp = *current;
*current = *next;
*next = tmp;
}
ngx_int_t
ngx_quic_keys_update(ngx_connection_t *c, ngx_quic_keys_t *keys)
{
ngx_uint_t i;
ngx_quic_ciphers_t ciphers;
ngx_quic_secrets_t *current, *next;
current = &keys->secrets[ssl_encryption_application];
next = &keys->next_key;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic key update"); ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic key update");
if (ngx_quic_ciphers(c->ssl->connection, &ciphers, if (ngx_quic_ciphers(keys->cipher, &ciphers, ssl_encryption_application)
ssl_encryption_application)
== NGX_ERROR) == NGX_ERROR)
{ {
return NGX_ERROR; return NGX_ERROR;
@ -760,12 +825,12 @@ ngx_quic_key_update(ngx_connection_t *c, ngx_quic_secrets_t *current,
static ngx_int_t static ngx_int_t
ngx_quic_create_long_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn, ngx_quic_create_long_packet(ngx_quic_header_t *pkt, ngx_str_t *res)
ngx_str_t *res)
{ {
u_char *pnp, *sample; u_char *pnp, *sample;
ngx_str_t ad, out; ngx_str_t ad, out;
ngx_uint_t i; ngx_uint_t i;
ngx_quic_secret_t *secret;
ngx_quic_ciphers_t ciphers; ngx_quic_ciphers_t ciphers;
u_char nonce[12], mask[16]; u_char nonce[12], mask[16];
@ -780,14 +845,17 @@ ngx_quic_create_long_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
ngx_quic_hexdump(pkt->log, "quic ad", ad.data, ad.len); ngx_quic_hexdump(pkt->log, "quic ad", ad.data, ad.len);
#endif #endif
if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) { if (ngx_quic_ciphers(pkt->keys->cipher, &ciphers, pkt->level) == NGX_ERROR)
{
return NGX_ERROR; return NGX_ERROR;
} }
ngx_memcpy(nonce, pkt->secret->iv.data, pkt->secret->iv.len); secret = &pkt->keys->secrets[pkt->level].server;
ngx_memcpy(nonce, secret->iv.data, secret->iv.len);
ngx_quic_compute_nonce(nonce, sizeof(nonce), pkt->number); ngx_quic_compute_nonce(nonce, sizeof(nonce), pkt->number);
if (ngx_quic_tls_seal(ciphers.c, pkt->secret, &out, if (ngx_quic_tls_seal(ciphers.c, secret, &out,
nonce, &pkt->payload, &ad, pkt->log) nonce, &pkt->payload, &ad, pkt->log)
!= NGX_OK) != NGX_OK)
{ {
@ -795,7 +863,7 @@ ngx_quic_create_long_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
} }
sample = &out.data[4 - pkt->num_len]; sample = &out.data[4 - pkt->num_len];
if (ngx_quic_tls_hp(pkt->log, ciphers.hp, pkt->secret, mask, sample) if (ngx_quic_tls_hp(pkt->log, ciphers.hp, secret, mask, sample)
!= NGX_OK) != NGX_OK)
{ {
return NGX_ERROR; return NGX_ERROR;
@ -815,12 +883,12 @@ ngx_quic_create_long_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
static ngx_int_t static ngx_int_t
ngx_quic_create_short_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn, ngx_quic_create_short_packet(ngx_quic_header_t *pkt, ngx_str_t *res)
ngx_str_t *res)
{ {
u_char *pnp, *sample; u_char *pnp, *sample;
ngx_str_t ad, out; ngx_str_t ad, out;
ngx_uint_t i; ngx_uint_t i;
ngx_quic_secret_t *secret;
ngx_quic_ciphers_t ciphers; ngx_quic_ciphers_t ciphers;
u_char nonce[12], mask[16]; u_char nonce[12], mask[16];
@ -835,14 +903,17 @@ ngx_quic_create_short_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
ngx_quic_hexdump(pkt->log, "quic ad", ad.data, ad.len); ngx_quic_hexdump(pkt->log, "quic ad", ad.data, ad.len);
#endif #endif
if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) { if (ngx_quic_ciphers(pkt->keys->cipher, &ciphers, pkt->level) == NGX_ERROR)
{
return NGX_ERROR; return NGX_ERROR;
} }
ngx_memcpy(nonce, pkt->secret->iv.data, pkt->secret->iv.len); secret = &pkt->keys->secrets[pkt->level].server;
ngx_memcpy(nonce, secret->iv.data, secret->iv.len);
ngx_quic_compute_nonce(nonce, sizeof(nonce), pkt->number); ngx_quic_compute_nonce(nonce, sizeof(nonce), pkt->number);
if (ngx_quic_tls_seal(ciphers.c, pkt->secret, &out, if (ngx_quic_tls_seal(ciphers.c, secret, &out,
nonce, &pkt->payload, &ad, pkt->log) nonce, &pkt->payload, &ad, pkt->log)
!= NGX_OK) != NGX_OK)
{ {
@ -850,7 +921,7 @@ ngx_quic_create_short_packet(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
} }
sample = &out.data[4 - pkt->num_len]; sample = &out.data[4 - pkt->num_len];
if (ngx_quic_tls_hp(pkt->log, ciphers.hp, pkt->secret, mask, sample) if (ngx_quic_tls_hp(pkt->log, ciphers.hp, secret, mask, sample)
!= NGX_OK) != NGX_OK)
{ {
return NGX_ERROR; return NGX_ERROR;
@ -902,7 +973,7 @@ ngx_quic_create_retry_packet(ngx_quic_header_t *pkt, ngx_str_t *res)
ngx_quic_hexdump(pkt->log, "quic retry itag", ad.data, ad.len); ngx_quic_hexdump(pkt->log, "quic retry itag", ad.data, ad.len);
#endif #endif
if (ngx_quic_ciphers(NULL, &ciphers, pkt->level) == NGX_ERROR) { if (ngx_quic_ciphers(0, &ciphers, pkt->level) == NGX_ERROR) {
return NGX_ERROR; return NGX_ERROR;
} }
@ -1033,24 +1104,22 @@ ngx_quic_compute_nonce(u_char *nonce, size_t len, uint64_t pn)
ngx_int_t ngx_int_t
ngx_quic_encrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn, ngx_quic_encrypt(ngx_quic_header_t *pkt, ngx_str_t *res)
ngx_str_t *res)
{ {
if (ngx_quic_short_pkt(pkt->flags)) { if (ngx_quic_short_pkt(pkt->flags)) {
return ngx_quic_create_short_packet(pkt, ssl_conn, res); return ngx_quic_create_short_packet(pkt, res);
} }
if (ngx_quic_pkt_retry(pkt->flags)) { if (ngx_quic_pkt_retry(pkt->flags)) {
return ngx_quic_create_retry_packet(pkt, res); return ngx_quic_create_retry_packet(pkt, res);
} }
return ngx_quic_create_long_packet(pkt, ssl_conn, res); return ngx_quic_create_long_packet(pkt, res);
} }
ngx_int_t ngx_int_t
ngx_quic_decrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn, ngx_quic_decrypt(ngx_quic_header_t *pkt, uint64_t *largest_pn)
uint64_t *largest_pn)
{ {
u_char clearflags, *p, *sample; u_char clearflags, *p, *sample;
size_t len; size_t len;
@ -1062,11 +1131,12 @@ ngx_quic_decrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
ngx_quic_ciphers_t ciphers; ngx_quic_ciphers_t ciphers;
uint8_t mask[16], nonce[12]; uint8_t mask[16], nonce[12];
if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) { if (ngx_quic_ciphers(pkt->keys->cipher, &ciphers, pkt->level) == NGX_ERROR)
{
return NGX_ERROR; return NGX_ERROR;
} }
secret = pkt->secret; secret = &pkt->keys->secrets[pkt->level].client;
p = pkt->raw->pos; p = pkt->raw->pos;
len = pkt->data + pkt->len - p; len = pkt->data + pkt->len - p;
@ -1099,7 +1169,7 @@ ngx_quic_decrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
key_phase = (clearflags & NGX_QUIC_PKT_KPHASE) != 0; key_phase = (clearflags & NGX_QUIC_PKT_KPHASE) != 0;
if (key_phase != pkt->key_phase) { if (key_phase != pkt->key_phase) {
secret = pkt->next; secret = &pkt->keys->next_key.client;
pkt->key_update = 1; pkt->key_update = 1;
} }
} }

41
src/event/ngx_event_quic_protection.h
View File

@ -15,37 +15,24 @@
#define NGX_QUIC_ENCRYPTION_LAST ((ssl_encryption_application) + 1) #define NGX_QUIC_ENCRYPTION_LAST ((ssl_encryption_application) + 1)
typedef struct ngx_quic_secret_s { ngx_quic_keys_t *ngx_quic_keys_new(ngx_pool_t *pool);
ngx_str_t secret; ngx_int_t ngx_quic_keys_set_initial_secret(ngx_pool_t *pool,
ngx_str_t key; ngx_quic_keys_t *keys, ngx_str_t *secret);
ngx_str_t iv; int ngx_quic_keys_set_encryption_secret(ngx_pool_t *pool, ngx_uint_t is_write,
ngx_str_t hp; ngx_quic_keys_t *keys, enum ssl_encryption_level_t level,
} ngx_quic_secret_t; const SSL_CIPHER *cipher, const uint8_t *secret, size_t secret_len);
ngx_uint_t ngx_quic_keys_available(ngx_quic_keys_t *keys,
enum ssl_encryption_level_t level);
void ngx_quic_keys_discard(ngx_quic_keys_t *keys,
enum ssl_encryption_level_t level);
void ngx_quic_keys_switch(ngx_connection_t *c, ngx_quic_keys_t *keys);
ngx_int_t ngx_quic_keys_update(ngx_connection_t *c, ngx_quic_keys_t *keys);
typedef struct {
ngx_quic_secret_t client;
ngx_quic_secret_t server;
} ngx_quic_secrets_t;
ngx_int_t ngx_quic_set_initial_secret(ngx_pool_t *pool,
ngx_quic_secret_t *client, ngx_quic_secret_t *server,
ngx_str_t *secret);
int ngx_quic_set_encryption_secret(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
enum ssl_encryption_level_t level, const uint8_t *secret, size_t secret_len,
ngx_quic_secret_t *peer_secret);
ngx_int_t ngx_quic_key_update(ngx_connection_t *c,
ngx_quic_secrets_t *current, ngx_quic_secrets_t *next);
ngx_int_t ngx_quic_new_sr_token(ngx_connection_t *c, ngx_str_t *cid, ngx_int_t ngx_quic_new_sr_token(ngx_connection_t *c, ngx_str_t *cid,
ngx_str_t *key, u_char *token); ngx_str_t *key, u_char *token);
ngx_int_t ngx_quic_encrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn, ngx_int_t ngx_quic_encrypt(ngx_quic_header_t *pkt, ngx_str_t *res);
ngx_str_t *res); ngx_int_t ngx_quic_decrypt(ngx_quic_header_t *pkt, uint64_t *largest_pn);
ngx_int_t ngx_quic_decrypt(ngx_quic_header_t *pkt, ngx_ssl_conn_t *ssl_conn,
uint64_t *largest_pn);
#endif /* _NGX_EVENT_QUIC_PROTECTION_H_INCLUDED_ */ #endif /* _NGX_EVENT_QUIC_PROTECTION_H_INCLUDED_ */

4
src/event/ngx_event_quic_transport.h
View File

@ -290,8 +290,8 @@ struct ngx_quic_frame_s {
typedef struct { typedef struct {
ngx_log_t *log; ngx_log_t *log;
struct ngx_quic_secret_s *secret; ngx_quic_keys_t *keys;
struct ngx_quic_secret_s *next;
ngx_msec_t received; ngx_msec_t received;
uint64_t number; uint64_t number;
uint8_t num_len; uint8_t num_len;