This patch adds support for TLS SessionTicket extension (RFC 5077) for
the parts used by EAP-FAST (RFC 4851).
This is based on the patch from Alexey Kobozev <akobozev@cisco.com>
(sent to openssl-dev mailing list on Tue, 07 Jun 2005 15:40:58 +0300).
OpenSSL 0.9.8zf does not enable TLS extension support by default, so it
will need to be enabled by adding enable-tlsext to config script
command line.
diff -upr openssl-0.9.8zf.orig/ssl/s3_clnt.c openssl-0.9.8zf/ssl/s3_clnt.c
--- openssl-0.9.8zf.orig/ssl/s3_clnt.c 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/s3_clnt.c 2015-03-24 16:19:14.043911769 +0200
@@ -760,6 +760,23 @@ int ssl3_get_server_hello(SSL *s)
goto f_err;
}
+#ifndef OPENSSL_NO_TLSEXT
+ /* check if we want to resume the session based on external pre-shared secret */
+ if (s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
+ SSL_CIPHER *pref_cipher = NULL;
+
+ s->session->master_key_length = sizeof(s->session->master_key);
+ if (s->tls_session_secret_cb(s, s->session->master_key,
+ &s->session->master_key_length,
+ NULL, &pref_cipher,
+ s->tls_session_secret_cb_arg)) {
+ s->session->cipher = pref_cipher ?
+ pref_cipher : ssl_get_cipher_by_char(s, p + j);
+ s->s3->flags |= SSL3_FLAGS_CCS_OK;
+ }
+ }
+#endif /* OPENSSL_NO_TLSEXT */
+
if (j != 0 && j == s->session->session_id_length
&& memcmp(p, s->session->session_id, j) == 0) {
if (s->sid_ctx_length != s->session->sid_ctx_length
@@ -2684,12 +2701,8 @@ int ssl3_check_finished(SSL *s)
{
int ok;
long n;
- /*
- * If we have no ticket or session ID is non-zero length (a match of a
- * non-zero session length would never reach here) it cannot be a resumed
- * session.
- */
- if (!s->session->tlsext_tick || s->session->session_id_length)
+ /* If we have no ticket it cannot be a resumed session. */
+ if (!s->session->tlsext_tick)
return 1;
/*
* this function is called when we really expect a Certificate message,
diff -upr openssl-0.9.8zf.orig/ssl/s3_srvr.c openssl-0.9.8zf/ssl/s3_srvr.c
--- openssl-0.9.8zf.orig/ssl/s3_srvr.c 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/s3_srvr.c 2015-03-24 16:23:34.567909681 +0200
@@ -999,6 +999,59 @@ int ssl3_get_client_hello(SSL *s)
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
goto err;
}
+
+ /* Check if we want to use external pre-shared secret for this
+ * handshake for not reused session only. We need to generate
+ * server_random before calling tls_session_secret_cb in order to allow
+ * SessionTicket processing to use it in key derivation. */
+ {
+ unsigned long Time;
+ unsigned char *pos;
+ Time = (unsigned long)time(NULL); /* Time */
+ pos = s->s3->server_random;
+ l2n(Time, pos);
+ if (RAND_pseudo_bytes(pos, SSL3_RANDOM_SIZE - 4) <= 0) {
+ al = SSL_AD_INTERNAL_ERROR;
+ goto f_err;
+ }
+ }
+
+ if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
+ SSL_CIPHER *pref_cipher = NULL;
+
+ s->session->master_key_length = sizeof(s->session->master_key);
+ if (s->tls_session_secret_cb(s, s->session->master_key,
+ &s->session->master_key_length,
+ ciphers, &pref_cipher,
+ s->tls_session_secret_cb_arg)) {
+ s->hit = 1;
+ s->session->ciphers = ciphers;
+ s->session->verify_result = X509_V_OK;
+
+ ciphers = NULL;
+
+ /* check if some cipher was preferred by call back */
+ pref_cipher = pref_cipher ? pref_cipher :
+ ssl3_choose_cipher(s, s->session->ciphers,
+ SSL_get_ciphers(s));
+ if (pref_cipher == NULL) {
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
+ goto f_err;
+ }
+
+ s->session->cipher = pref_cipher;
+
+ if (s->cipher_list)
+ sk_SSL_CIPHER_free(s->cipher_list);
+
+ if (s->cipher_list_by_id)
+ sk_SSL_CIPHER_free(s->cipher_list_by_id);
+
+ s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
+ s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
+ }
+ }
#endif
/*
* Worst case, we will use the NULL compression, but if we have other
@@ -1143,15 +1196,21 @@ int ssl3_send_server_hello(SSL *s)
unsigned char *buf;
unsigned char *p, *d;
int i, sl;
- unsigned long l, Time;
+ unsigned long l;
+#ifdef OPENSSL_NO_TLSEXT
+ unsigned long Time;
+#endif
if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
buf = (unsigned char *)s->init_buf->data;
+#ifdef OPENSSL_NO_TLSEXT
p = s->s3->server_random;
+ /* Generate server_random if it was not needed previously */
Time = (unsigned long)time(NULL); /* Time */
l2n(Time, p);
if (RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4) <= 0)
return -1;
+#endif
/* Do the message type and length last */
d = p = &(buf[4]);
diff -upr openssl-0.9.8zf.orig/ssl/ssl_err.c openssl-0.9.8zf/ssl/ssl_err.c
--- openssl-0.9.8zf.orig/ssl/ssl_err.c 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/ssl_err.c 2015-03-24 16:35:58.627903717 +0200
@@ -316,6 +316,7 @@ static ERR_STRING_DATA SSL_str_functs[]
{ERR_FUNC(SSL_F_TLS1_ENC), "TLS1_ENC"},
{ERR_FUNC(SSL_F_TLS1_SETUP_KEY_BLOCK), "TLS1_SETUP_KEY_BLOCK"},
{ERR_FUNC(SSL_F_WRITE_PENDING), "WRITE_PENDING"},
+ {ERR_FUNC(SSL_F_SSL_SET_SESSION_TICKET_EXT), "SSL_set_session_ticket_ext"},
{0, NULL}
};
diff -upr openssl-0.9.8zf.orig/ssl/ssl.h openssl-0.9.8zf/ssl/ssl.h
--- openssl-0.9.8zf.orig/ssl/ssl.h 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/ssl.h 2015-03-24 16:25:44.339908641 +0200
@@ -349,6 +349,7 @@ extern "C" {
* function parameters used to prototype callbacks in SSL_CTX.
*/
typedef struct ssl_st *ssl_crock_st;
+typedef struct tls_session_ticket_ext_st TLS_SESSION_TICKET_EXT;
/* used to hold info on the particular ciphers used */
typedef struct ssl_cipher_st {
@@ -366,6 +367,12 @@ typedef struct ssl_cipher_st {
DECLARE_STACK_OF(SSL_CIPHER)
+typedef int (*tls_session_ticket_ext_cb_fn)(SSL *s, const unsigned char *data,
+ int len, void *arg);
+typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len,
+ STACK_OF(SSL_CIPHER) *peer_ciphers,
+ SSL_CIPHER **cipher, void *arg);
+
/* Used to hold functions for SSLv2 or SSLv3/TLSv1 functions */
typedef struct ssl_method_st {
int version;
@@ -1116,6 +1123,18 @@ struct ssl_st {
int tlsext_ocsp_resplen;
/* RFC4507 session ticket expected to be received or sent */
int tlsext_ticket_expected;
+
+ /* TLS Session Ticket extension override */
+ TLS_SESSION_TICKET_EXT *tlsext_session_ticket;
+
+ /* TLS Session Ticket extension callback */
+ tls_session_ticket_ext_cb_fn tls_session_ticket_ext_cb;
+ void *tls_session_ticket_ext_cb_arg;
+
+ /* TLS pre-shared secret session resumption */
+ tls_session_secret_cb_fn tls_session_secret_cb;
+ void *tls_session_secret_cb_arg;
+
SSL_CTX *initial_ctx; /* initial ctx, used to store sessions */
# define session_ctx initial_ctx
# else
@@ -1772,6 +1791,17 @@ void *SSL_COMP_get_compression_methods(v
int SSL_COMP_add_compression_method(int id, void *cm);
# endif
+/* TLS extensions functions */
+int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len);
+
+int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
+ void *arg);
+
+/* Pre-shared secret session resumption functions */
+int SSL_set_session_secret_cb(SSL *s,
+ tls_session_secret_cb_fn tls_session_secret_cb,
+ void *arg);
+
/* BEGIN ERROR CODES */
/*
* The following lines are auto generated by the script mkerr.pl. Any changes
@@ -1977,6 +2007,7 @@ void ERR_load_SSL_strings(void);
# define SSL_F_TLS1_ENC 210
# define SSL_F_TLS1_SETUP_KEY_BLOCK 211
# define SSL_F_WRITE_PENDING 212
+#define SSL_F_SSL_SET_SESSION_TICKET_EXT 213
/* Reason codes. */
# define SSL_R_APP_DATA_IN_HANDSHAKE 100
diff -upr openssl-0.9.8zf.orig/ssl/ssl_sess.c openssl-0.9.8zf/ssl/ssl_sess.c
--- openssl-0.9.8zf.orig/ssl/ssl_sess.c 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/ssl_sess.c 2015-03-24 16:28:04.819907515 +0200
@@ -716,6 +716,61 @@ long SSL_CTX_get_timeout(const SSL_CTX *
return (s->session_timeout);
}
+#ifndef OPENSSL_NO_TLSEXT
+int SSL_set_session_secret_cb(
+ SSL *s,
+ int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len,
+ STACK_OF(SSL_CIPHER) *peer_ciphers,
+ SSL_CIPHER **cipher, void *arg), void *arg)
+{
+ if (s == NULL)
+ return 0;
+ s->tls_session_secret_cb = tls_session_secret_cb;
+ s->tls_session_secret_cb_arg = arg;
+ return 1;
+}
+
+int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
+ void *arg)
+{
+ if (s == NULL)
+ return 0;
+ s->tls_session_ticket_ext_cb = cb;
+ s->tls_session_ticket_ext_cb_arg = arg;
+ return 1;
+}
+
+int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
+{
+ if (s->version >= TLS1_VERSION) {
+ if (s->tlsext_session_ticket) {
+ OPENSSL_free(s->tlsext_session_ticket);
+ s->tlsext_session_ticket = NULL;
+ }
+
+ s->tlsext_session_ticket = OPENSSL_malloc(
+ sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
+ if (!s->tlsext_session_ticket) {
+ SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ if (ext_data) {
+ s->tlsext_session_ticket->length = ext_len;
+ s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1;
+ memcpy(s->tlsext_session_ticket->data, ext_data, ext_len);
+ } else {
+ s->tlsext_session_ticket->length = 0;
+ s->tlsext_session_ticket->data = NULL;
+ }
+
+ return 1;
+ }
+
+ return 0;
+}
+#endif /* OPENSSL_NO_TLSEXT */
+
typedef struct timeout_param_st {
SSL_CTX *ctx;
long time;
diff -upr openssl-0.9.8zf.orig/ssl/t1_lib.c openssl-0.9.8zf/ssl/t1_lib.c
--- openssl-0.9.8zf.orig/ssl/t1_lib.c 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/t1_lib.c 2015-03-24 16:32:46.923905254 +0200
@@ -108,6 +108,11 @@ int tls1_new(SSL *s)
void tls1_free(SSL *s)
{
+#ifndef OPENSSL_NO_TLSEXT
+ if (s->tlsext_session_ticket) {
+ OPENSSL_free(s->tlsext_session_ticket);
+ }
+#endif
ssl3_free(s);
}
@@ -206,8 +211,20 @@ unsigned char *ssl_add_clienthello_tlsex
int ticklen;
if (!s->new_session && s->session && s->session->tlsext_tick)
ticklen = s->session->tlsext_ticklen;
- else
+ else if (s->session && s->tlsext_session_ticket &&
+ s->tlsext_session_ticket->data) {
+ ticklen = s->tlsext_session_ticket->length;
+ s->session->tlsext_tick = OPENSSL_malloc(ticklen);
+ if (!s->session->tlsext_tick)
+ return NULL;
+ memcpy(s->session->tlsext_tick, s->tlsext_session_ticket->data,
+ ticklen);
+ s->session->tlsext_ticklen = ticklen;
+ } else
ticklen = 0;
+ if (ticklen == 0 && s->tlsext_session_ticket &&
+ s->tlsext_session_ticket->data == NULL)
+ goto skip_ext;
/*
* Check for enough room 2 for extension type, 2 for len rest for
* ticket
@@ -221,6 +238,7 @@ unsigned char *ssl_add_clienthello_tlsex
ret += ticklen;
}
}
+skip_ext:
if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
s->version != DTLS1_VERSION) {
@@ -560,6 +578,14 @@ int ssl_parse_clienthello_tlsext(SSL *s,
if (!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
return 0;
renegotiate_seen = 1;
+ } else if (type == TLSEXT_TYPE_session_ticket) {
+ if (s->tls_session_ticket_ext_cb &&
+ !s->tls_session_ticket_ext_cb(s, data, size,
+ s->tls_session_ticket_ext_cb_arg))
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
} else if (type == TLSEXT_TYPE_status_request &&
s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) {
@@ -710,6 +736,13 @@ int ssl_parse_serverhello_tlsext(SSL *s,
}
tlsext_servername = 1;
} else if (type == TLSEXT_TYPE_session_ticket) {
+ if (s->tls_session_ticket_ext_cb &&
+ !s->tls_session_ticket_ext_cb(
+ s, data, size,
+ s->tls_session_ticket_ext_cb_arg)) {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
|| (size > 0)) {
*al = TLS1_AD_UNSUPPORTED_EXTENSION;
@@ -993,6 +1026,14 @@ int tls1_process_ticket(SSL *s, unsigned
s->tlsext_ticket_expected = 1;
return 0; /* Cache miss */
}
+ if (s->tls_session_secret_cb) {
+ /* Indicate cache miss here and instead of
+ * generating the session from ticket now,
+ * trigger abbreviated handshake based on
+ * external mechanism to calculate the master
+ * secret later. */
+ return 0;
+ }
return tls_decrypt_ticket(s, p, size, session_id, len, ret);
}
p += size;
diff -upr openssl-0.9.8zf.orig/ssl/tls1.h openssl-0.9.8zf/ssl/tls1.h
--- openssl-0.9.8zf.orig/ssl/tls1.h 2015-03-19 15:46:46.000000000 +0200
+++ openssl-0.9.8zf/ssl/tls1.h 2015-03-24 16:33:31.855904894 +0200
@@ -460,6 +460,12 @@ SSL_CTX_callback_ctrl(ssl,SSL_CTRL_SET_T
# define TLS_MD_MASTER_SECRET_CONST "\x6d\x61\x73\x74\x65\x72\x20\x73\x65\x63\x72\x65\x74"
# endif
+/* TLS extension struct */
+struct tls_session_ticket_ext_st {
+ unsigned short length;
+ void *data;
+};
+
#ifdef __cplusplus
}
#endif
diff -upr openssl-0.9.8zf.orig/util/ssleay.num openssl-0.9.8zf/util/ssleay.num
--- openssl-0.9.8zf.orig/util/ssleay.num 2015-03-19 15:47:15.000000000 +0200
+++ openssl-0.9.8zf/util/ssleay.num 2015-03-24 16:33:51.127904739 +0200
@@ -242,3 +242,5 @@ SSL_set_SSL_CTX
SSL_get_servername 291 EXIST::FUNCTION:TLSEXT
SSL_get_servername_type 292 EXIST::FUNCTION:TLSEXT
SSL_CTX_set_client_cert_engine 293 EXIST::FUNCTION:ENGINE
+SSL_set_session_ticket_ext 306 EXIST::FUNCTION:TLSEXT
+SSL_set_session_secret_cb 307 EXIST::FUNCTION:TLSEXT