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t1_lib.c
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t1_lib.c
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/ocsp.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include "ssl_locl.h"
#include <openssl/ct.h>
#define CHECKLEN(curr, val, limit) \
(((curr) >= (limit)) || (size_t)((limit) - (curr)) < (size_t)(val))
static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
const unsigned char *sess_id, int sesslen,
SSL_SESSION **psess);
static int ssl_check_clienthello_tlsext_early(SSL *s);
static int ssl_check_serverhello_tlsext(SSL *s);
SSL3_ENC_METHOD const TLSv1_enc_data = {
tls1_enc,
tls1_mac,
tls1_setup_key_block,
tls1_generate_master_secret,
tls1_change_cipher_state,
tls1_final_finish_mac,
TLS1_FINISH_MAC_LENGTH,
TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
tls1_alert_code,
tls1_export_keying_material,
0,
SSL3_HM_HEADER_LENGTH,
ssl3_set_handshake_header,
ssl3_handshake_write
};
SSL3_ENC_METHOD const TLSv1_1_enc_data = {
tls1_enc,
tls1_mac,
tls1_setup_key_block,
tls1_generate_master_secret,
tls1_change_cipher_state,
tls1_final_finish_mac,
TLS1_FINISH_MAC_LENGTH,
TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
tls1_alert_code,
tls1_export_keying_material,
SSL_ENC_FLAG_EXPLICIT_IV,
SSL3_HM_HEADER_LENGTH,
ssl3_set_handshake_header,
ssl3_handshake_write
};
SSL3_ENC_METHOD const TLSv1_2_enc_data = {
tls1_enc,
tls1_mac,
tls1_setup_key_block,
tls1_generate_master_secret,
tls1_change_cipher_state,
tls1_final_finish_mac,
TLS1_FINISH_MAC_LENGTH,
TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
tls1_alert_code,
tls1_export_keying_material,
SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
| SSL_ENC_FLAG_TLS1_2_CIPHERS,
SSL3_HM_HEADER_LENGTH,
ssl3_set_handshake_header,
ssl3_handshake_write
};
long tls1_default_timeout(void)
{
/*
* 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
* http, the cache would over fill
*/
return (60 * 60 * 2);
}
int tls1_new(SSL *s)
{
if (!ssl3_new(s))
return (0);
s->method->ssl_clear(s);
return (1);
}
void tls1_free(SSL *s)
{
OPENSSL_free(s->tlsext_session_ticket);
ssl3_free(s);
}
void tls1_clear(SSL *s)
{
ssl3_clear(s);
if (s->method->version == TLS_ANY_VERSION)
s->version = TLS_MAX_VERSION;
else
s->version = s->method->version;
}
#ifndef OPENSSL_NO_EC
typedef struct {
int nid; /* Curve NID */
int secbits; /* Bits of security (from SP800-57) */
unsigned int flags; /* Flags: currently just field type */
} tls_curve_info;
/*
* Table of curve information.
* Do not delete entries or reorder this array! It is used as a lookup
* table: the index of each entry is one less than the TLS curve id.
*/
static const tls_curve_info nid_list[] = {
{NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
{NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
{NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
{NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
{NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
{NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
{NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
{NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
{NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
{NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
{NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
{NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
{NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
{NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
{NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
{NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
{NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
{NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
{NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
{NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
{NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
{NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
{NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
{NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
{NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
{NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
{NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
{NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
{NID_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
};
static const unsigned char ecformats_default[] = {
TLSEXT_ECPOINTFORMAT_uncompressed,
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
};
/* The default curves */
static const unsigned char eccurves_default[] = {
0, 29, /* X25519 (29) */
0, 23, /* secp256r1 (23) */
0, 25, /* secp521r1 (25) */
0, 24, /* secp384r1 (24) */
};
static const unsigned char suiteb_curves[] = {
0, TLSEXT_curve_P_256,
0, TLSEXT_curve_P_384
};
int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags)
{
const tls_curve_info *cinfo;
/* ECC curves from RFC 4492 and RFC 7027 */
if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list)))
return 0;
cinfo = nid_list + curve_id - 1;
if (pflags)
*pflags = cinfo->flags;
return cinfo->nid;
}
int tls1_ec_nid2curve_id(int nid)
{
size_t i;
for (i = 0; i < OSSL_NELEM(nid_list); i++) {
if (nid_list[i].nid == nid)
return i + 1;
}
return 0;
}
/*
* Get curves list, if "sess" is set return client curves otherwise
* preferred list.
* Sets |num_curves| to the number of curves in the list, i.e.,
* the length of |pcurves| is 2 * num_curves.
* Returns 1 on success and 0 if the client curves list has invalid format.
* The latter indicates an internal error: we should not be accepting such
* lists in the first place.
* TODO(emilia): we should really be storing the curves list in explicitly
* parsed form instead. (However, this would affect binary compatibility
* so cannot happen in the 1.0.x series.)
*/
static int tls1_get_curvelist(SSL *s, int sess,
const unsigned char **pcurves, size_t *num_curves)
{
size_t pcurveslen = 0;
if (sess) {
*pcurves = s->session->tlsext_ellipticcurvelist;
pcurveslen = s->session->tlsext_ellipticcurvelist_length;
} else {
/* For Suite B mode only include P-256, P-384 */
switch (tls1_suiteb(s)) {
case SSL_CERT_FLAG_SUITEB_128_LOS:
*pcurves = suiteb_curves;
pcurveslen = sizeof(suiteb_curves);
break;
case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
*pcurves = suiteb_curves;
pcurveslen = 2;
break;
case SSL_CERT_FLAG_SUITEB_192_LOS:
*pcurves = suiteb_curves + 2;
pcurveslen = 2;
break;
default:
*pcurves = s->tlsext_ellipticcurvelist;
pcurveslen = s->tlsext_ellipticcurvelist_length;
}
if (!*pcurves) {
*pcurves = eccurves_default;
pcurveslen = sizeof(eccurves_default);
}
}
/* We do not allow odd length arrays to enter the system. */
if (pcurveslen & 1) {
SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
*num_curves = 0;
return 0;
}
*num_curves = pcurveslen / 2;
return 1;
}
/* See if curve is allowed by security callback */
static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
{
const tls_curve_info *cinfo;
if (curve[0])
return 1;
if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list)))
return 0;
cinfo = &nid_list[curve[1] - 1];
# ifdef OPENSSL_NO_EC2M
if (cinfo->flags & TLS_CURVE_CHAR2)
return 0;
# endif
return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
}
/* Check a curve is one of our preferences */
int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
{
const unsigned char *curves;
size_t num_curves, i;
unsigned int suiteb_flags = tls1_suiteb(s);
if (len != 3 || p[0] != NAMED_CURVE_TYPE)
return 0;
/* Check curve matches Suite B preferences */
if (suiteb_flags) {
unsigned long cid = s->s3->tmp.new_cipher->id;
if (p[1])
return 0;
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
if (p[2] != TLSEXT_curve_P_256)
return 0;
} else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
if (p[2] != TLSEXT_curve_P_384)
return 0;
} else /* Should never happen */
return 0;
}
if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
return 0;
for (i = 0; i < num_curves; i++, curves += 2) {
if (p[1] == curves[0] && p[2] == curves[1])
return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
}
return 0;
}
/*-
* For nmatch >= 0, return the NID of the |nmatch|th shared curve or NID_undef
* if there is no match.
* For nmatch == -1, return number of matches
* For nmatch == -2, return the NID of the curve to use for
* an EC tmp key, or NID_undef if there is no match.
*/
int tls1_shared_curve(SSL *s, int nmatch)
{
const unsigned char *pref, *supp;
size_t num_pref, num_supp, i, j;
int k;
/* Can't do anything on client side */
if (s->server == 0)
return -1;
if (nmatch == -2) {
if (tls1_suiteb(s)) {
/*
* For Suite B ciphersuite determines curve: we already know
* these are acceptable due to previous checks.
*/
unsigned long cid = s->s3->tmp.new_cipher->id;
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
return NID_X9_62_prime256v1; /* P-256 */
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
return NID_secp384r1; /* P-384 */
/* Should never happen */
return NID_undef;
}
/* If not Suite B just return first preference shared curve */
nmatch = 0;
}
/*
* Avoid truncation. tls1_get_curvelist takes an int
* but s->options is a long...
*/
if (!tls1_get_curvelist(s,
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0,
&supp, &num_supp))
/* In practice, NID_undef == 0 but let's be precise. */
return nmatch == -1 ? 0 : NID_undef;
if (!tls1_get_curvelist(s,
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0,
&pref, &num_pref))
return nmatch == -1 ? 0 : NID_undef;
for (k = 0, i = 0; i < num_pref; i++, pref += 2) {
const unsigned char *tsupp = supp;
for (j = 0; j < num_supp; j++, tsupp += 2) {
if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) {
if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
continue;
if (nmatch == k) {
int id = (pref[0] << 8) | pref[1];
return tls1_ec_curve_id2nid(id, NULL);
}
k++;
}
}
}
if (nmatch == -1)
return k;
/* Out of range (nmatch > k). */
return NID_undef;
}
int tls1_set_curves(unsigned char **pext, size_t *pextlen,
int *curves, size_t ncurves)
{
unsigned char *clist, *p;
size_t i;
/*
* Bitmap of curves included to detect duplicates: only works while curve
* ids < 32
*/
unsigned long dup_list = 0;
clist = OPENSSL_malloc(ncurves * 2);
if (clist == NULL)
return 0;
for (i = 0, p = clist; i < ncurves; i++) {
unsigned long idmask;
int id;
id = tls1_ec_nid2curve_id(curves[i]);
idmask = 1L << id;
if (!id || (dup_list & idmask)) {
OPENSSL_free(clist);
return 0;
}
dup_list |= idmask;
s2n(id, p);
}
OPENSSL_free(*pext);
*pext = clist;
*pextlen = ncurves * 2;
return 1;
}
# define MAX_CURVELIST 28
typedef struct {
size_t nidcnt;
int nid_arr[MAX_CURVELIST];
} nid_cb_st;
static int nid_cb(const char *elem, int len, void *arg)
{
nid_cb_st *narg = arg;
size_t i;
int nid;
char etmp[20];
if (elem == NULL)
return 0;
if (narg->nidcnt == MAX_CURVELIST)
return 0;
if (len > (int)(sizeof(etmp) - 1))
return 0;
memcpy(etmp, elem, len);
etmp[len] = 0;
nid = EC_curve_nist2nid(etmp);
if (nid == NID_undef)
nid = OBJ_sn2nid(etmp);
if (nid == NID_undef)
nid = OBJ_ln2nid(etmp);
if (nid == NID_undef)
return 0;
for (i = 0; i < narg->nidcnt; i++)
if (narg->nid_arr[i] == nid)
return 0;
narg->nid_arr[narg->nidcnt++] = nid;
return 1;
}
/* Set curves based on a colon separate list */
int tls1_set_curves_list(unsigned char **pext, size_t *pextlen, const char *str)
{
nid_cb_st ncb;
ncb.nidcnt = 0;
if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
return 0;
if (pext == NULL)
return 1;
return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
}
/* For an EC key set TLS id and required compression based on parameters */
static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
EC_KEY *ec)
{
int id;
const EC_GROUP *grp;
if (!ec)
return 0;
/* Determine if it is a prime field */
grp = EC_KEY_get0_group(ec);
if (!grp)
return 0;
/* Determine curve ID */
id = EC_GROUP_get_curve_name(grp);
id = tls1_ec_nid2curve_id(id);
/* If no id return error: we don't support arbitrary explicit curves */
if (id == 0)
return 0;
curve_id[0] = 0;
curve_id[1] = (unsigned char)id;
if (comp_id) {
if (EC_KEY_get0_public_key(ec) == NULL)
return 0;
if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
*comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
} else {
if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)
*comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
else
*comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
}
}
return 1;
}
/* Check an EC key is compatible with extensions */
static int tls1_check_ec_key(SSL *s,
unsigned char *curve_id, unsigned char *comp_id)
{
const unsigned char *pformats, *pcurves;
size_t num_formats, num_curves, i;
int j;
/*
* If point formats extension present check it, otherwise everything is
* supported (see RFC4492).
*/
if (comp_id && s->session->tlsext_ecpointformatlist) {
pformats = s->session->tlsext_ecpointformatlist;
num_formats = s->session->tlsext_ecpointformatlist_length;
for (i = 0; i < num_formats; i++, pformats++) {
if (*comp_id == *pformats)
break;
}
if (i == num_formats)
return 0;
}
if (!curve_id)
return 1;
/* Check curve is consistent with client and server preferences */
for (j = 0; j <= 1; j++) {
if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
return 0;
if (j == 1 && num_curves == 0) {
/*
* If we've not received any curves then skip this check.
* RFC 4492 does not require the supported elliptic curves extension
* so if it is not sent we can just choose any curve.
* It is invalid to send an empty list in the elliptic curves
* extension, so num_curves == 0 always means no extension.
*/
break;
}
for (i = 0; i < num_curves; i++, pcurves += 2) {
if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1])
break;
}
if (i == num_curves)
return 0;
/* For clients can only check sent curve list */
if (!s->server)
break;
}
return 1;
}
static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
size_t *num_formats)
{
/*
* If we have a custom point format list use it otherwise use default
*/
if (s->tlsext_ecpointformatlist) {
*pformats = s->tlsext_ecpointformatlist;
*num_formats = s->tlsext_ecpointformatlist_length;
} else {
*pformats = ecformats_default;
/* For Suite B we don't support char2 fields */
if (tls1_suiteb(s))
*num_formats = sizeof(ecformats_default) - 1;
else
*num_formats = sizeof(ecformats_default);
}
}
/*
* Check cert parameters compatible with extensions: currently just checks EC
* certificates have compatible curves and compression.
*/
static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
{
unsigned char comp_id, curve_id[2];
EVP_PKEY *pkey;
int rv;
pkey = X509_get0_pubkey(x);
if (!pkey)
return 0;
/* If not EC nothing to do */
if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
return 1;
rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey));
if (!rv)
return 0;
/*
* Can't check curve_id for client certs as we don't have a supported
* curves extension.
*/
rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
if (!rv)
return 0;
/*
* Special case for suite B. We *MUST* sign using SHA256+P-256 or
* SHA384+P-384, adjust digest if necessary.
*/
if (set_ee_md && tls1_suiteb(s)) {
int check_md;
size_t i;
CERT *c = s->cert;
if (curve_id[0])
return 0;
/* Check to see we have necessary signing algorithm */
if (curve_id[1] == TLSEXT_curve_P_256)
check_md = NID_ecdsa_with_SHA256;
else if (curve_id[1] == TLSEXT_curve_P_384)
check_md = NID_ecdsa_with_SHA384;
else
return 0; /* Should never happen */
for (i = 0; i < c->shared_sigalgslen; i++)
if (check_md == c->shared_sigalgs[i].signandhash_nid)
break;
if (i == c->shared_sigalgslen)
return 0;
if (set_ee_md == 2) {
if (check_md == NID_ecdsa_with_SHA256)
s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha256();
else
s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha384();
}
}
return rv;
}
# ifndef OPENSSL_NO_EC
/*
* tls1_check_ec_tmp_key - Check EC temporary key compatibility
* @s: SSL connection
* @cid: Cipher ID we're considering using
*
* Checks that the kECDHE cipher suite we're considering using
* is compatible with the client extensions.
*
* Returns 0 when the cipher can't be used or 1 when it can.
*/
int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
{
/*
* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
* curves permitted.
*/
if (tls1_suiteb(s)) {
unsigned char curve_id[2];
/* Curve to check determined by ciphersuite */
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
curve_id[1] = TLSEXT_curve_P_256;
else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
curve_id[1] = TLSEXT_curve_P_384;
else
return 0;
curve_id[0] = 0;
/* Check this curve is acceptable */
if (!tls1_check_ec_key(s, curve_id, NULL))
return 0;
return 1;
}
/* Need a shared curve */
if (tls1_shared_curve(s, 0))
return 1;
return 0;
}
# endif /* OPENSSL_NO_EC */
#else
static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
{
return 1;
}
#endif /* OPENSSL_NO_EC */
/*
* List of supported signature algorithms and hashes. Should make this
* customisable at some point, for now include everything we support.
*/
#ifdef OPENSSL_NO_RSA
# define tlsext_sigalg_rsa(md) /* */
#else
# define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
#endif
#ifdef OPENSSL_NO_DSA
# define tlsext_sigalg_dsa(md) /* */
#else
# define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
#endif
#ifdef OPENSSL_NO_EC
# define tlsext_sigalg_ecdsa(md)/* */
#else
# define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
#endif
#define tlsext_sigalg(md) \
tlsext_sigalg_rsa(md) \
tlsext_sigalg_dsa(md) \
tlsext_sigalg_ecdsa(md)
static const unsigned char tls12_sigalgs[] = {
tlsext_sigalg(TLSEXT_hash_sha512)
tlsext_sigalg(TLSEXT_hash_sha384)
tlsext_sigalg(TLSEXT_hash_sha256)
tlsext_sigalg(TLSEXT_hash_sha224)
tlsext_sigalg(TLSEXT_hash_sha1)
#ifndef OPENSSL_NO_GOST
TLSEXT_hash_gostr3411, TLSEXT_signature_gostr34102001,
TLSEXT_hash_gostr34112012_256, TLSEXT_signature_gostr34102012_256,
TLSEXT_hash_gostr34112012_512, TLSEXT_signature_gostr34102012_512
#endif
};
#ifndef OPENSSL_NO_EC
static const unsigned char suiteb_sigalgs[] = {
tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
};
#endif
size_t tls12_get_psigalgs(SSL *s, int sent, const unsigned char **psigs)
{
/*
* If Suite B mode use Suite B sigalgs only, ignore any other
* preferences.
*/
#ifndef OPENSSL_NO_EC
switch (tls1_suiteb(s)) {
case SSL_CERT_FLAG_SUITEB_128_LOS:
*psigs = suiteb_sigalgs;
return sizeof(suiteb_sigalgs);
case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
*psigs = suiteb_sigalgs;
return 2;
case SSL_CERT_FLAG_SUITEB_192_LOS:
*psigs = suiteb_sigalgs + 2;
return 2;
}
#endif
/* If server use client authentication sigalgs if not NULL */
if (s->server == sent && s->cert->client_sigalgs) {
*psigs = s->cert->client_sigalgs;
return s->cert->client_sigalgslen;
} else if (s->cert->conf_sigalgs) {
*psigs = s->cert->conf_sigalgs;
return s->cert->conf_sigalgslen;
} else {
*psigs = tls12_sigalgs;
return sizeof(tls12_sigalgs);
}
}
/*
* Check signature algorithm is consistent with sent supported signature
* algorithms and if so return relevant digest.
*/
int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
const unsigned char *sig, EVP_PKEY *pkey)
{
const unsigned char *sent_sigs;
size_t sent_sigslen, i;
int sigalg = tls12_get_sigid(pkey);
/* Should never happen */
if (sigalg == -1)
return -1;
/* Check key type is consistent with signature */
if (sigalg != (int)sig[1]) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
return 0;
}
#ifndef OPENSSL_NO_EC
if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) {
unsigned char curve_id[2], comp_id;
/* Check compression and curve matches extensions */
if (!tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey)))
return 0;
if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
return 0;
}
/* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
if (tls1_suiteb(s)) {
if (curve_id[0])
return 0;
if (curve_id[1] == TLSEXT_curve_P_256) {
if (sig[0] != TLSEXT_hash_sha256) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
SSL_R_ILLEGAL_SUITEB_DIGEST);
return 0;
}
} else if (curve_id[1] == TLSEXT_curve_P_384) {
if (sig[0] != TLSEXT_hash_sha384) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
SSL_R_ILLEGAL_SUITEB_DIGEST);
return 0;
}
} else
return 0;
}
} else if (tls1_suiteb(s))
return 0;
#endif
/* Check signature matches a type we sent */
sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
for (i = 0; i < sent_sigslen; i += 2, sent_sigs += 2) {
if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
break;
}
/* Allow fallback to SHA1 if not strict mode */
if (i == sent_sigslen
&& (sig[0] != TLSEXT_hash_sha1
|| s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
return 0;
}
*pmd = tls12_get_hash(sig[0]);
if (*pmd == NULL) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST);
return 0;
}
/* Make sure security callback allows algorithm */
if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd), (void *)sig)) {
SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
return 0;
}
/*
* Store the digest used so applications can retrieve it if they wish.
*/
s->s3->tmp.peer_md = *pmd;
return 1;
}
/*
* Set a mask of disabled algorithms: an algorithm is disabled if it isn't
* supported, doesn't appear in supported signature algorithms, isn't supported
* by the enabled protocol versions or by the security level.
*
* This function should only be used for checking which ciphers are supported
* by the client.
*
* Call ssl_cipher_disabled() to check that it's enabled or not.
*/
void ssl_set_client_disabled(SSL *s)
{
s->s3->tmp.mask_a = 0;
s->s3->tmp.mask_k = 0;
ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
ssl_get_client_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver);
#ifndef OPENSSL_NO_PSK
/* with PSK there must be client callback set */
if (!s->psk_client_callback) {
s->s3->tmp.mask_a |= SSL_aPSK;
s->s3->tmp.mask_k |= SSL_PSK;
}
#endif /* OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
s->s3->tmp.mask_a |= SSL_aSRP;
s->s3->tmp.mask_k |= SSL_kSRP;
}
#endif
}
/*
* ssl_cipher_disabled - check that a cipher is disabled or not
* @s: SSL connection that you want to use the cipher on
* @c: cipher to check
* @op: Security check that you want to do
* @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
*
* Returns 1 when it's disabled, 0 when enabled.
*/
int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
{
if (c->algorithm_mkey & s->s3->tmp.mask_k
|| c->algorithm_auth & s->s3->tmp.mask_a)
return 1;
if (s->s3->tmp.max_ver == 0)
return 1;
if (!SSL_IS_DTLS(s)) {
int min_tls = c->min_tls;
/*
* For historical reasons we will allow ECHDE to be selected by a server
* in SSLv3 if we are a client
*/
if (min_tls == TLS1_VERSION && ecdhe
&& (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
min_tls = SSL3_VERSION;
if ((min_tls > s->s3->tmp.max_ver) || (c->max_tls < s->s3->tmp.min_ver))
return 1;
}
if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
|| DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
return 1;
return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
}
static int tls_use_ticket(SSL *s)
{
if (s->options & SSL_OP_NO_TICKET)
return 0;
return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
}
static int compare_uint(const void *p1, const void *p2)
{
unsigned int u1 = *((const unsigned int *)p1);
unsigned int u2 = *((const unsigned int *)p2);
if (u1 < u2)
return -1;
else if (u1 > u2)
return 1;
else
return 0;
}
/*
* Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
* more than one extension of the same type in a ClientHello or ServerHello.
* This function does an initial scan over the extensions block to filter those
* out. It returns 1 if all extensions are unique, and 0 if the extensions
* contain duplicates, could not be successfully parsed, or an internal error
* occurred.
*/
static int tls1_check_duplicate_extensions(const PACKET *packet)
{
PACKET extensions = *packet;
size_t num_extensions = 0, i = 0;
unsigned int *extension_types = NULL;
int ret = 0;
/* First pass: count the extensions. */
while (PACKET_remaining(&extensions) > 0) {
unsigned int type;
PACKET extension;
if (!PACKET_get_net_2(&extensions, &type) ||
!PACKET_get_length_prefixed_2(&extensions, &extension)) {
goto done;
}
num_extensions++;
}
if (num_extensions <= 1)
return 1;
extension_types = OPENSSL_malloc(sizeof(unsigned int) * num_extensions);
if (extension_types == NULL) {
SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_MALLOC_FAILURE);
goto done;
}
/* Second pass: gather the extension types. */
extensions = *packet;
for (i = 0; i < num_extensions; i++) {
PACKET extension;
if (!PACKET_get_net_2(&extensions, &extension_types[i]) ||
!PACKET_get_length_prefixed_2(&extensions, &extension)) {
/* This should not happen. */
SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
goto done;
}
}
if (PACKET_remaining(&extensions) != 0) {
SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR);
goto done;
}
/* Sort the extensions and make sure there are no duplicates. */
qsort(extension_types, num_extensions, sizeof(unsigned int), compare_uint);
for (i = 1; i < num_extensions; i++) {
if (extension_types[i - 1] == extension_types[i])
goto done;
}
ret = 1;
done:
OPENSSL_free(extension_types);
return ret;
}
unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf,
unsigned char *limit, int *al)
{
int extdatalen = 0;
unsigned char *orig = buf;
unsigned char *ret = buf;
#ifndef OPENSSL_NO_EC
/* See if we support any ECC ciphersuites */
int using_ecc = 0;
if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s)) {
int i;
unsigned long alg_k, alg_a;
STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) {
const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
alg_k = c->algorithm_mkey;
alg_a = c->algorithm_auth;
if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
|| (alg_a & SSL_aECDSA)) {