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feature: supported OpenSSL 1.1.1 by upgrading the OpenSSL patch. Previously, we used the OpenSSL 1.1.1 ClientHello callback to do ssl session fetching non-blockingly. However, this way cannot handle an edge case: the ssl session resumption via session ticket might fail, and the client fallbacks to session ID resumption. The ClientHello callback is run too early to know if the client will fallback to use session ID resumption. Therefore, we have to take back the OpenSSL sess_set_get_cb_yield patch and upgrade it to adapt OpenSSL 1.1.1. Thanks Yongjian Xu and crasyangel for their help. See 08e9e50. Signed-off-by: Thibault Charbonnier <thibaultcha@me.com>
2019-07-15 18:00:04 +00:00
diff --git a/include/openssl/bio.h b/include/openssl/bio.h
--- a/include/openssl/bio.h
+++ b/include/openssl/bio.h
@@ -219,6 +219,8 @@ void BIO_clear_flags(BIO *b, int flags);
/* Returned from the accept BIO when an accept would have blocked */
# define BIO_RR_ACCEPT 0x03
+# define BIO_RR_SSL_SESSION_LOOKUP 0x09
+
/* These are passed by the BIO callback */
# define BIO_CB_FREE 0x01
# define BIO_CB_READ 0x02
diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -896,6 +896,7 @@ __owur int SSL_extension_supported(unsigned int ext_type);
# define SSL_ASYNC_PAUSED 5
# define SSL_ASYNC_NO_JOBS 6
# define SSL_CLIENT_HELLO_CB 7
+# define SSL_SESS_LOOKUP 99
/* These will only be used when doing non-blocking IO */
# define SSL_want_nothing(s) (SSL_want(s) == SSL_NOTHING)
@@ -905,6 +906,7 @@ __owur int SSL_extension_supported(unsigned int ext_type);
# define SSL_want_async(s) (SSL_want(s) == SSL_ASYNC_PAUSED)
# define SSL_want_async_job(s) (SSL_want(s) == SSL_ASYNC_NO_JOBS)
# define SSL_want_client_hello_cb(s) (SSL_want(s) == SSL_CLIENT_HELLO_CB)
+# define SSL_want_sess_lookup(s) (SSL_want(s) == SSL_SESS_LOOKUP)
# define SSL_MAC_FLAG_READ_MAC_STREAM 1
# define SSL_MAC_FLAG_WRITE_MAC_STREAM 2
@@ -1190,6 +1192,8 @@ DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
# define SSL_ERROR_WANT_ASYNC 9
# define SSL_ERROR_WANT_ASYNC_JOB 10
# define SSL_ERROR_WANT_CLIENT_HELLO_CB 11
+# define SSL_ERROR_WANT_SESSION_LOOKUP 99
+# define SSL_ERROR_PENDING_SESSION 99 /* BoringSSL compatibility */
# define SSL_CTRL_SET_TMP_DH 3
# define SSL_CTRL_SET_TMP_ECDH 4
# define SSL_CTRL_SET_TMP_DH_CB 6
@@ -1662,6 +1666,7 @@ int SSL_SESSION_print(BIO *fp, const SSL_SESSION *ses);
int SSL_SESSION_print_keylog(BIO *bp, const SSL_SESSION *x);
int SSL_SESSION_up_ref(SSL_SESSION *ses);
void SSL_SESSION_free(SSL_SESSION *ses);
+SSL_SESSION *SSL_magic_pending_session_ptr(void);
__owur int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
__owur int SSL_set_session(SSL *to, SSL_SESSION *session);
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session);
diff --git a/ssl/bio_ssl.c b/ssl/bio_ssl.c
--- a/ssl/bio_ssl.c
+++ b/ssl/bio_ssl.c
@@ -139,6 +139,10 @@ static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes)
BIO_set_retry_special(b);
retry_reason = BIO_RR_SSL_X509_LOOKUP;
break;
+ case SSL_ERROR_WANT_SESSION_LOOKUP:
+ BIO_set_retry_special(b);
+ retry_reason = BIO_RR_SSL_SESSION_LOOKUP;
+ break;
case SSL_ERROR_WANT_ACCEPT:
BIO_set_retry_special(b);
retry_reason = BIO_RR_ACCEPT;
@@ -207,6 +211,10 @@ static int ssl_write(BIO *b, const char *buf, size_t size, size_t *written)
BIO_set_retry_special(b);
retry_reason = BIO_RR_SSL_X509_LOOKUP;
break;
+ case SSL_ERROR_WANT_SESSION_LOOKUP:
+ BIO_set_retry_special(b);
+ retry_reason = BIO_RR_SSL_SESSION_LOOKUP;
+ break;
case SSL_ERROR_WANT_CONNECT:
BIO_set_retry_special(b);
retry_reason = BIO_RR_CONNECT;
@@ -361,6 +369,10 @@ static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
BIO_set_retry_special(b);
BIO_set_retry_reason(b, BIO_RR_SSL_X509_LOOKUP);
break;
+ case SSL_ERROR_WANT_SESSION_LOOKUP:
+ BIO_set_retry_special(b);
+ BIO_set_retry_reason(b, BIO_RR_SSL_SESSION_LOOKUP);
+ break;
default:
break;
}
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -3556,6 +3556,8 @@ int SSL_get_error(const SSL *s, int i)
return SSL_ERROR_WANT_ASYNC_JOB;
if (SSL_want_client_hello_cb(s))
return SSL_ERROR_WANT_CLIENT_HELLO_CB;
+ if (SSL_want_sess_lookup(s))
+ return SSL_ERROR_WANT_SESSION_LOOKUP;
if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
(s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -16,6 +16,8 @@
#include "ssl_locl.h"
#include "statem/statem_locl.h"
+static const char g_pending_session_magic = 0;
+
static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
@@ -476,6 +478,10 @@ SSL_SESSION *lookup_sess_in_cache(SSL *s, const unsigned char *sess_id,
ret = s->session_ctx->get_session_cb(s, sess_id, sess_id_len, &copy);
+ if (ret == SSL_magic_pending_session_ptr()) {
+ return ret; /* Retry later */
+ }
+
if (ret != NULL) {
tsan_counter(&s->session_ctx->stats.sess_cb_hit);
@@ -564,6 +570,9 @@ int ssl_get_prev_session(SSL *s, CLIENTHELLO_MSG *hello)
try_session_cache = 1;
ret = lookup_sess_in_cache(s, hello->session_id,
hello->session_id_len);
+ if (ret == SSL_magic_pending_session_ptr()) {
+ return -2; /* Retry later */
+ }
}
break;
case SSL_TICKET_NO_DECRYPT:
@@ -989,6 +998,11 @@ X509 *SSL_SESSION_get0_peer(SSL_SESSION *s)
return s->peer;
}
+SSL_SESSION *SSL_magic_pending_session_ptr(void)
+{
+ return (SSL_SESSION *) &g_pending_session_magic;
+}
+
int SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
unsigned int sid_ctx_len)
{
diff --git a/ssl/statem/statem_srvr.c b/ssl/statem/statem_srvr.c
--- a/ssl/statem/statem_srvr.c
+++ b/ssl/statem/statem_srvr.c
@@ -1600,6 +1600,7 @@ static int tls_early_post_process_client_hello(SSL *s)
STACK_OF(SSL_CIPHER) *scsvs = NULL;
CLIENTHELLO_MSG *clienthello = s->clienthello;
DOWNGRADE dgrd = DOWNGRADE_NONE;
+ PACKET saved_ciphers;
/* Finished parsing the ClientHello, now we can start processing it */
/* Give the ClientHello callback a crack at things */
@@ -1707,6 +1708,7 @@ static int tls_early_post_process_client_hello(SSL *s)
}
s->hit = 0;
+ saved_ciphers = clienthello->ciphersuites;
if (!ssl_cache_cipherlist(s, &clienthello->ciphersuites,
clienthello->isv2) ||
@@ -1812,6 +1814,10 @@ static int tls_early_post_process_client_hello(SSL *s)
} else if (i == -1) {
/* SSLfatal() already called */
goto err;
+ } else if (i == -2) {
+ clienthello->ciphersuites = saved_ciphers;
+ s->rwstate = SSL_SESS_LOOKUP;
+ return -1;
} else {
/* i == 0 */
if (!ssl_get_new_session(s, 1)) {
@@ -1819,6 +1825,7 @@ static int tls_early_post_process_client_hello(SSL *s)
goto err;
}
}
+ s->rwstate = SSL_NOTHING;
}
if (SSL_IS_TLS13(s)) {
diff --git a/util/libssl.num b/util/libssl.num
--- a/util/libssl.num
+++ b/util/libssl.num
@@ -7,6 +7,7 @@ SSL_copy_session_id 6 1_1_0 EXIST::FUNCTION:
SSL_CTX_set_srp_password 7 1_1_0 EXIST::FUNCTION:SRP
SSL_shutdown 8 1_1_0 EXIST::FUNCTION:
SSL_CTX_set_msg_callback 9 1_1_0 EXIST::FUNCTION:
+SSL_magic_pending_session_ptr 10 1_1_0 EXIST::FUNCTION:
SSL_SESSION_get0_ticket 11 1_1_0 EXIST::FUNCTION:
SSL_get1_supported_ciphers 12 1_1_0 EXIST::FUNCTION:
SSL_state_string_long 13 1_1_0 EXIST::FUNCTION: