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Change cipher default strings to a function

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Making the default cipher strings a function gives the library more
control over the defaults. Potentially allowing a change in the
future as ciphers become deprecated or dangerous.
Also allows third party distributors to change the defaults for their
installations.

Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8686)
This commit is contained in:
Todd Short 2019-04-05 10:03:29 -04:00 committed by Matt Caswell
parent 3f91ede9ae
commit 5d12051167
7 changed files with 76 additions and 15 deletions
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4
CHANGES
View file

@ -9,6 +9,10 @@
Changes between 1.1.1 and 3.0.0 [xx XXX xxxx]
*) Default cipher lists/suites are now avaialble via a function, the
#defines are deprecated.
[Todd Short]
*) Add target VC-WIN32-UWP, VC-WIN64A-UWP, VC-WIN32-ARM-UWP and
VC-WIN64-ARM-UWP in Windows OneCore target for making building libraries
for Windows Store apps easier. Also, the "no-uplink" option has been added.

19
doc/man3/SSL_CTX_set_cipher_list.pod
View file

@ -5,7 +5,9 @@
SSL_CTX_set_cipher_list,
SSL_set_cipher_list,
SSL_CTX_set_ciphersuites,
SSL_set_ciphersuites
SSL_set_ciphersuites,
OSSL_default_cipher_list,
OSSL_default_ciphersuites
- choose list of available SSL_CIPHERs
=head1 SYNOPSIS
@ -18,6 +20,9 @@ SSL_set_ciphersuites
int SSL_CTX_set_ciphersuites(SSL_CTX *ctx, const char *str);
int SSL_set_ciphersuites(SSL *s, const char *str);
const char *OSSL_default_cipher_list(void);
const char *OSSL_default_ciphersuites(void);
=head1 DESCRIPTION
SSL_CTX_set_cipher_list() sets the list of available ciphers (TLSv1.2 and below)
@ -54,6 +59,10 @@ An empty list is permissible. The default value for the this setting is:
SSL_set_ciphersuites() is the same as SSL_CTX_set_ciphersuites() except it
configures the ciphersuites for B<ssl>.
OSSL_default_cipher_list() returns the default cipher string for TLSv1.2
(and earlier) ciphers. OSSL_default_ciphersuites() returns the default
cipher string for TLSv1.3 ciphersuites.
=head1 NOTES
The control string B<str> for SSL_CTX_set_cipher_list() and
@ -85,6 +94,10 @@ of 512 bits and the server is not configured to use temporary RSA
keys), the "no shared cipher" (SSL_R_NO_SHARED_CIPHER) error is generated
and the handshake will fail.
OSSL_default_cipher_list() and OSSL_default_ciphersuites() replace
SSL_DEFAULT_CIPHER_LIST and TLS_DEFAULT_CIPHERSUITES, respectively. The
cipher list defines are deprecated as of 3.0.0.
=head1 RETURN VALUES
SSL_CTX_set_cipher_list() and SSL_set_cipher_list() return 1 if any cipher
@ -100,6 +113,10 @@ L<SSL_CTX_use_certificate(3)>,
L<SSL_CTX_set_tmp_dh_callback(3)>,
L<ciphers(1)>
=head1 HISTORY
OSSL_default_cipher_list() and OSSL_default_ciphersites() are new in 3.0.0.
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

16
include/openssl/ssl.h
View file

@ -169,9 +169,16 @@ extern "C" {
* The following cipher list is used by default. It also is substituted when
* an application-defined cipher list string starts with 'DEFAULT'.
* This applies to ciphersuites for TLSv1.2 and below.
* DEPRECATED IN 3.0.0, in favor of OSSL_default_cipher_list()
* Update both macro and function simultaneously
*/
# if !OPENSSL_API_3
# define SSL_DEFAULT_CIPHER_LIST "ALL:!COMPLEMENTOFDEFAULT:!eNULL"
/* This is the default set of TLSv1.3 ciphersuites */
/*
* This is the default set of TLSv1.3 ciphersuites
* DEPRECATED IN 3.0.0, in favor of OSSL_default_ciphersuites()
* Update both macro and function simultaneously
*/
# if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
# define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
"TLS_CHACHA20_POLY1305_SHA256:" \
@ -179,7 +186,8 @@ extern "C" {
# else
# define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
"TLS_AES_128_GCM_SHA256"
#endif
# endif
# endif
/*
* As of OpenSSL 1.0.0, ssl_create_cipher_list() in ssl/ssl_ciph.c always
* starts with a reasonable order, and all we have to do for DEFAULT is
@ -2443,6 +2451,10 @@ void SSL_set_allow_early_data_cb(SSL *s,
SSL_allow_early_data_cb_fn cb,
void *arg);
/* store the default cipher strings inside the library */
const char *OSSL_default_cipher_list(void);
const char *OSSL_default_ciphersuites(void);
# ifdef __cplusplus
}
# endif

26
ssl/ssl_ciph.c
View file

@ -1573,7 +1573,7 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
ok = 1;
rule_p = rule_str;
if (strncmp(rule_str, "DEFAULT", 7) == 0) {
ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
ok = ssl_cipher_process_rulestr(OSSL_default_cipher_list(),
&head, &tail, ca_list, c);
rule_p += 7;
if (*rule_p == ':')
@ -2168,3 +2168,27 @@ int ssl_cert_is_disabled(size_t idx)
return 1;
return 0;
}
/*
* Default list of TLSv1.2 (and earlier) ciphers
* SSL_DEFAULT_CIPHER_LIST deprecated in 3.0.0
* Update both macro and function simultaneously
*/
const char *OSSL_default_cipher_list(void)
{
return "ALL:!COMPLEMENTOFDEFAULT:!eNULL";
}
/*
* Default list of TLSv1.3 (and later) ciphers
* TLS_DEFAULT_CIPHERSUITES deprecated in 3.0.0
* Update both macro and function simultaneously
*/
const char *OSSL_default_ciphersuites(void)
{
return "TLS_AES_256_GCM_SHA384:"
#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
"TLS_CHACHA20_POLY1305_SHA256:"
#endif
"TLS_AES_128_GCM_SHA256";
}

8
ssl/ssl_lib.c
View file

@ -655,7 +655,7 @@ int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
ctx->method = meth;
if (!SSL_CTX_set_ciphersuites(ctx, TLS_DEFAULT_CIPHERSUITES)) {
if (!SSL_CTX_set_ciphersuites(ctx, OSSL_default_ciphersuites())) {
SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION, SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
return 0;
}
@ -663,7 +663,7 @@ int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
ctx->tls13_ciphersuites,
&(ctx->cipher_list),
&(ctx->cipher_list_by_id),
SSL_DEFAULT_CIPHER_LIST, ctx->cert);
OSSL_default_cipher_list(), ctx->cert);
if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0)) {
SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION, SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
return 0;
@ -3078,13 +3078,13 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
goto err;
#endif
if (!SSL_CTX_set_ciphersuites(ret, TLS_DEFAULT_CIPHERSUITES))
if (!SSL_CTX_set_ciphersuites(ret, OSSL_default_ciphersuites()))
goto err;
if (!ssl_create_cipher_list(ret->method,
ret->tls13_ciphersuites,
&ret->cipher_list, &ret->cipher_list_by_id,
SSL_DEFAULT_CIPHER_LIST, ret->cert)
OSSL_default_cipher_list(), ret->cert)
|| sk_SSL_CIPHER_num(ret->cipher_list) <= 0) {
SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_LIBRARY_HAS_NO_CIPHERS);
goto err2;

2
util/libssl.num
View file

@ -504,3 +504,5 @@ SSL_set_async_callback 504 3_0_0 EXIST::FUNCTION:
SSL_set_async_callback_arg 505 3_0_0 EXIST::FUNCTION:
SSL_get_async_status 506 3_0_0 EXIST::FUNCTION:
SSL_sendfile 507 3_0_0 EXIST::FUNCTION:
OSSL_default_cipher_list 508 3_0_0 EXIST::FUNCTION:
OSSL_default_ciphersuites 509 3_0_0 EXIST::FUNCTION:

2
util/private.num
View file

@ -421,6 +421,7 @@ SSL_CTX_set_tlsext_status_type define
SSL_CTX_set_tlsext_ticket_key_cb define
SSL_CTX_set_tmp_dh define
SSL_CTX_set_tmp_ecdh define
SSL_DEFAULT_CIPHER_LIST define deprecated 3.0.0
SSL_add0_chain_cert define
SSL_add1_chain_cert define
SSL_build_cert_chain define
@ -499,6 +500,7 @@ SSL_want_x509_lookup define
SSLv23_client_method define
SSLv23_method define
SSLv23_server_method define
TLS_DEFAULT_CIPHERSUITES define deprecated 3.0.0
X509_STORE_set_lookup_crls_cb define
X509_STORE_set_verify_func define
EVP_PKEY_CTX_set1_id define