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Add a timestamp to the cookie

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Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/4435)
This commit is contained in:
Matt Caswell 2018-01-17 14:29:22 +00:00
parent c2f9648d5d
commit d0debc0a1c
1 changed files with 14 additions and 4 deletions
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18
ssl/statem/extensions_srvr.c
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@ -17,11 +17,11 @@
/*
* 2 bytes for packet length, 2 bytes for format version, 2 bytes for
* protocol version, 2 bytes for group id, 2 bytes for cipher id, 1 byte for
* key_share present flag, 2 bytes for the hashlen, EVP_MAX_MD_SIZE for
* transcript hash, 1 byte for app cookie length, app cookie length bytes,
* SHA256_DIGEST_LENGTH bytes for the HMAC of the whole thing.
* key_share present flag, 4 bytes for timestamp, 2 bytes for the hashlen,
* EVP_MAX_MD_SIZE for transcript hash, 1 byte for app cookie length, app cookie
* length bytes, SHA256_DIGEST_LENGTH bytes for the HMAC of the whole thing.
*/
#define MAX_COOKIE_SIZE (2 + 2 + 2 + 2 + 2 + 1 + 2 + EVP_MAX_MD_SIZE + 1 \
#define MAX_COOKIE_SIZE (2 + 2 + 2 + 2 + 2 + 1 + 4 + 2 + EVP_MAX_MD_SIZE + 1 \
+ SSL_COOKIE_LENGTH + SHA256_DIGEST_LENGTH)
/*
@ -705,6 +705,7 @@ int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
unsigned char hmac[SHA256_DIGEST_LENGTH];
unsigned char hrr[MAX_HRR_SIZE];
size_t rawlen, hmaclen, hrrlen, ciphlen;
unsigned long tm, now;
/* Ignore any cookie if we're not set up to verify it */
if (s->ctx->app_verify_cookie_cb == NULL
@ -814,6 +815,7 @@ int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
}
if (!PACKET_get_1(&cookie, &key_share)
|| !PACKET_get_net_4(&cookie, &tm)
|| !PACKET_get_length_prefixed_2(&cookie, &chhash)
|| !PACKET_get_length_prefixed_1(&cookie, &appcookie)
|| PACKET_remaining(&cookie) != SHA256_DIGEST_LENGTH) {
@ -822,6 +824,13 @@ int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
return 0;
}
/* We tolerate a cookie age of up to 10 minutes (= 60 * 10 seconds) */
now = (unsigned long)time(NULL);
if (tm > now || (now - tm) > 600) {
/* Cookie is stale. Ignore it */
return 1;
}
/* Verify the app cookie */
if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&appcookie),
PACKET_remaining(&appcookie)) == 0) {
@ -1603,6 +1612,7 @@ EXT_RETURN tls_construct_stoc_cookie(SSL *s, WPACKET *pkt, unsigned int context,
&ciphlen)
/* Is there a key_share extension present in this HRR? */
|| !WPACKET_put_bytes_u8(pkt, s->s3->peer_tmp == NULL)
|| !WPACKET_put_bytes_u32(pkt, (unsigned int)time(NULL))
|| !WPACKET_start_sub_packet_u16(pkt)
|| !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &hashval1)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_COOKIE,