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Extended master secret extension support.

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Add and retrieve extended master secret extension, setting the flag
SSL_SESS_FLAG_EXTMS appropriately.

Note: this just sets the flag and doesn't include the changes to
master secret generation.
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2015-01-23 02:45:13 +00:00
parent c660ec63a8
commit ddc06b3556
4 changed files with 26 additions and 1 deletions
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4
ssl/ssl_txt.c
View file

@ -244,6 +244,10 @@ int SSL_SESSION_print(BIO *bp, const SSL_SESSION *x)
X509_verify_cert_error_string(x->verify_result)) <= 0)
goto err;
if (BIO_printf(bp, " Extended master secret: %s\n",
x->flags & SSL_SESS_FLAG_EXTMS ? "yes" : "no") <= 0)
goto err;
return (1);
err:
return (0);

14
ssl/t1_lib.c
View file

@ -1445,6 +1445,8 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf,
s2n(TLSEXT_TYPE_encrypt_then_mac, ret);
s2n(0, ret);
# endif
s2n(TLSEXT_TYPE_extended_master_secret, ret);
s2n(0, ret);
/*
* Add padding to workaround bugs in F5 terminators. See
@ -1682,6 +1684,10 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf,
}
}
# endif
if (!s->hit && s->session->flags & SSL_SESS_FLAG_EXTMS) {
s2n(TLSEXT_TYPE_extended_master_secret, ret);
s2n(0, ret);
}
if (s->s3->alpn_selected) {
const unsigned char *selected = s->s3->alpn_selected;
@ -2300,6 +2306,10 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p,
else if (type == TLSEXT_TYPE_encrypt_then_mac)
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
# endif
else if (type == TLSEXT_TYPE_extended_master_secret) {
if (!s->hit)
s->session->flags |= SSL_SESS_FLAG_EXTMS;
}
/*
* If this ClientHello extension was unhandled and this is a
* nonresumed connection, check whether the extension is a custom
@ -2594,6 +2604,10 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p,
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
}
# endif
else if (type == TLSEXT_TYPE_extended_master_secret) {
if (!s->hit)
s->session->flags |= SSL_SESS_FLAG_EXTMS;
}
/*
* If this extension type was not otherwise handled, but matches a
* custom_cli_ext_record, then send it to the c callback

3
ssl/t1_trce.c
View file

@ -363,7 +363,8 @@ static ssl_trace_tbl ssl_exts_tbl[] = {
{TLSEXT_TYPE_session_ticket, "session_ticket"},
{TLSEXT_TYPE_renegotiate, "renegotiate"},
{TLSEXT_TYPE_next_proto_neg, "next_proto_neg"},
{TLSEXT_TYPE_padding, "padding"}
{TLSEXT_TYPE_padding, "padding"},
{TLSEXT_TYPE_extended_master_secret, "extended_master_secret"}
};
static ssl_trace_tbl ssl_curve_tbl[] = {

6
ssl/tls1.h
View file

@ -250,6 +250,12 @@ extern "C" {
* http://www.ietf.org/id/draft-ietf-tls-encrypt-then-mac-02.txt
*/
# define TLSEXT_TYPE_encrypt_then_mac 22
/*
* Extended master secret extension.
* http://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml
* https://tools.ietf.org/id/draft-ietf-tls-session-hash-03.txt
*/
# define TLSEXT_TYPE_extended_master_secret 23
/* ExtensionType value from RFC4507 */
# define TLSEXT_TYPE_session_ticket 35