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QUIC: using compile time block/iv length for tokens.

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Reference values can be found in RFC 3602, 2.1, 2.4.
This commit is contained in:
Sergey Kandaurov 2021-06-16 18:03:33 +03:00
parent cfbd3c7097
commit f997461f23
1 changed files with 8 additions and 4 deletions
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12
src/event/quic/ngx_event_quic_tokens.c
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@ -14,6 +14,10 @@
#define NGX_QUIC_MAX_TOKEN_SIZE 64
/* SHA-1(addr)=20 + sizeof(time_t) + retry(1) + odcid.len(1) + odcid */
/* RFC 3602, 2.1 and 2.4 for AES-CBC block size and IV length */
#define NGX_QUIC_AES_256_CBC_IV_LEN 16
#define NGX_QUIC_AES_256_CBC_BLOCK_SIZE 16
static void ngx_quic_address_hash(struct sockaddr *sockaddr, socklen_t socklen,
ngx_uint_t no_port, u_char buf[20]);
@ -76,9 +80,9 @@ ngx_quic_new_token(ngx_connection_t *c, struct sockaddr *sockaddr,
len = p - in;
cipher = EVP_aes_256_cbc();
iv_len = EVP_CIPHER_iv_length(cipher);
iv_len = NGX_QUIC_AES_256_CBC_IV_LEN;
token->len = iv_len + len + EVP_CIPHER_block_size(cipher);
token->len = iv_len + len + NGX_QUIC_AES_256_CBC_BLOCK_SIZE;
token->data = ngx_pnalloc(c->pool, token->len);
if (token->data == NULL) {
return NGX_ERROR;
@ -188,11 +192,11 @@ ngx_quic_validate_token(ngx_connection_t *c, u_char *key,
cipher = EVP_aes_256_cbc();
iv = pkt->token.data;
iv_len = EVP_CIPHER_iv_length(cipher);
iv_len = NGX_QUIC_AES_256_CBC_IV_LEN;
/* sanity checks */
if (pkt->token.len < (size_t) iv_len + EVP_CIPHER_block_size(cipher)) {
if (pkt->token.len < (size_t) iv_len + NGX_QUIC_AES_256_CBC_BLOCK_SIZE) {
goto garbage;
}