[openssl] OpenSSL_1_1_1-stable update
Matt Caswell
matt at openssl.org
Tue Mar 5 14:32:33 UTC 2019
The branch OpenSSL_1_1_1-stable has been updated
via c9a826d28f8211e86b3b866809e1b30a2de48740 (commit)
from 99f0c7a8a6999e2f78fc065e4da78643ae14c14c (commit)
- Log -----------------------------------------------------------------
commit c9a826d28f8211e86b3b866809e1b30a2de48740
Author: Matt Caswell <matt at openssl.org>
Date: Fri Mar 1 15:40:20 2019 +0000
Don't write the tick_identity to the session
Sessions must be immutable once they can be shared with multiple threads.
We were breaking that rule by writing the ticket index into it during the
handshake. This can lead to incorrect behaviour, including failed
connections in multi-threaded environments.
Reported by David Benjamin.
Reviewed-by: Paul Dale <paul.dale at oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8383)
(cherry picked from commit c96ce52ce293785b54a42d119c457aef739cc2ce)
-----------------------------------------------------------------------
Summary of changes:
ssl/ssl_locl.h | 11 +++++++----
ssl/statem/extensions.c | 2 --
ssl/statem/extensions_clnt.c | 36 +++++++++++++++++++++++-------------
ssl/statem/extensions_srvr.c | 4 ++--
ssl/statem/statem_clnt.c | 5 +----
5 files changed, 33 insertions(+), 25 deletions(-)
diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index f326399..33db146 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -574,7 +574,6 @@ struct ssl_session_st {
/* Session lifetime hint in seconds */
unsigned long tick_lifetime_hint;
uint32_t tick_age_add;
- int tick_identity;
/* Max number of bytes that can be sent as early data */
uint32_t max_early_data;
/* The ALPN protocol selected for this session */
@@ -1356,6 +1355,13 @@ struct ssl_st {
* as this extension is optional on server side.
*/
uint8_t max_fragment_len_mode;
+
+ /*
+ * On the client side the number of ticket identities we sent in the
+ * ClientHello. On the server side the identity of the ticket we
+ * selected.
+ */
+ int tick_identity;
} ext;
/*
@@ -2052,9 +2058,6 @@ typedef enum downgrade_en {
#define TLSEXT_KEX_MODE_FLAG_KE 1
#define TLSEXT_KEX_MODE_FLAG_KE_DHE 2
-/* An invalid index into the TLSv1.3 PSK identities */
-#define TLSEXT_PSK_BAD_IDENTITY -1
-
#define SSL_USE_PSS(s) (s->s3->tmp.peer_sigalg != NULL && \
s->s3->tmp.peer_sigalg->sig == EVP_PKEY_RSA_PSS)
diff --git a/ssl/statem/extensions.c b/ssl/statem/extensions.c
index c3d3441..b27608c 100644
--- a/ssl/statem/extensions.c
+++ b/ssl/statem/extensions.c
@@ -989,7 +989,6 @@ static int final_server_name(SSL *s, unsigned int context, int sent)
ss->ext.ticklen = 0;
ss->ext.tick_lifetime_hint = 0;
ss->ext.tick_age_add = 0;
- ss->ext.tick_identity = 0;
if (!ssl_generate_session_id(s, ss)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_SERVER_NAME,
ERR_R_INTERNAL_ERROR);
@@ -1646,7 +1645,6 @@ static int final_early_data(SSL *s, unsigned int context, int sent)
if (s->max_early_data == 0
|| !s->hit
- || s->session->ext.tick_identity != 0
|| s->early_data_state != SSL_EARLY_DATA_ACCEPTING
|| !s->ext.early_data_ok
|| s->hello_retry_request != SSL_HRR_NONE
diff --git a/ssl/statem/extensions_clnt.c b/ssl/statem/extensions_clnt.c
index ab4dbf6..012e687 100644
--- a/ssl/statem/extensions_clnt.c
+++ b/ssl/statem/extensions_clnt.c
@@ -993,7 +993,7 @@ EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
const EVP_MD *handmd = NULL, *mdres = NULL, *mdpsk = NULL;
int dores = 0;
- s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
+ s->ext.tick_identity = 0;
/*
* Note: At this stage of the code we only support adding a single
@@ -1083,6 +1083,7 @@ EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
agems += s->session->ext.tick_age_add;
reshashsize = EVP_MD_size(mdres);
+ s->ext.tick_identity++;
dores = 1;
}
@@ -1142,6 +1143,7 @@ EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
ERR_R_INTERNAL_ERROR);
return EXT_RETURN_FAIL;
}
+ s->ext.tick_identity++;
}
if (!WPACKET_close(pkt)
@@ -1180,11 +1182,6 @@ EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
return EXT_RETURN_FAIL;
}
- if (dores)
- s->session->ext.tick_identity = 0;
- if (s->psksession != NULL)
- s->psksession->ext.tick_identity = (dores ? 1 : 0);
-
return EXT_RETURN_SENT;
#else
return EXT_RETURN_NOT_SENT;
@@ -1927,8 +1924,7 @@ int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
}
if (!s->ext.early_data_ok
- || !s->hit
- || s->session->ext.tick_identity != 0) {
+ || !s->hit) {
/*
* If we get here then we didn't send early data, or we didn't resume
* using the first identity, or the SNI/ALPN is not consistent so the
@@ -1956,17 +1952,28 @@ int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
return 0;
}
- if (s->session->ext.tick_identity == (int)identity) {
+ if (identity >= (unsigned int)s->ext.tick_identity) {
+ SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_PSK,
+ SSL_R_BAD_PSK_IDENTITY);
+ return 0;
+ }
+
+ /*
+ * Session resumption tickets are always sent before PSK tickets. If the
+ * ticket index is 0 then it must be for a session resumption ticket if we
+ * sent two tickets, or if we didn't send a PSK ticket.
+ */
+ if (identity == 0 && (s->psksession == NULL || s->ext.tick_identity == 2)) {
s->hit = 1;
SSL_SESSION_free(s->psksession);
s->psksession = NULL;
return 1;
}
- if (s->psksession == NULL
- || s->psksession->ext.tick_identity != (int)identity) {
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_PSK,
- SSL_R_BAD_PSK_IDENTITY);
+ if (s->psksession == NULL) {
+ /* Should never happen */
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PARSE_STOC_PSK,
+ ERR_R_INTERNAL_ERROR);
return 0;
}
@@ -1985,6 +1992,9 @@ int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
s->session = s->psksession;
s->psksession = NULL;
s->hit = 1;
+ /* Early data is only allowed if we used the first ticket */
+ if (identity != 0)
+ s->ext.early_data_ok = 0;
#endif
return 1;
diff --git a/ssl/statem/extensions_srvr.c b/ssl/statem/extensions_srvr.c
index 0f2b223..c5ced14 100644
--- a/ssl/statem/extensions_srvr.c
+++ b/ssl/statem/extensions_srvr.c
@@ -1274,7 +1274,7 @@ int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
goto err;
}
- sess->ext.tick_identity = id;
+ s->ext.tick_identity = id;
SSL_SESSION_free(s->session);
s->session = sess;
@@ -1948,7 +1948,7 @@ EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk)
|| !WPACKET_start_sub_packet_u16(pkt)
- || !WPACKET_put_bytes_u16(pkt, s->session->ext.tick_identity)
+ || !WPACKET_put_bytes_u16(pkt, s->ext.tick_identity)
|| !WPACKET_close(pkt)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS_CONSTRUCT_STOC_PSK, ERR_R_INTERNAL_ERROR);
diff --git a/ssl/statem/statem_clnt.c b/ssl/statem/statem_clnt.c
index e56d24d..87800cd 100644
--- a/ssl/statem/statem_clnt.c
+++ b/ssl/statem/statem_clnt.c
@@ -1613,10 +1613,7 @@ MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt)
* so the PAC-based session secret is always preserved. It'll be
* overwritten if the server refuses resumption.
*/
- if (s->session->session_id_length > 0
- || (SSL_IS_TLS13(s)
- && s->session->ext.tick_identity
- != TLSEXT_PSK_BAD_IDENTITY)) {
+ if (s->session->session_id_length > 0) {
tsan_counter(&s->session_ctx->stats.sess_miss);
if (!ssl_get_new_session(s, 0)) {
/* SSLfatal() already called */
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