/*
- * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2016-2019 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
#include <openssl/evp.h>
#include <openssl/kdf.h>
-#define TLS13_MAX_LABEL_LEN 246
+#define TLS13_MAX_LABEL_LEN 249
/* Always filled with zeros */
static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
* Given a |secret|; a |label| of length |labellen|; and |data| of length
* |datalen| (e.g. typically a hash of the handshake messages), derive a new
* secret |outlen| bytes long and store it in the location pointed to be |out|.
- * The |data| value may be zero length. Returns 1 on success 0 on failure.
+ * The |data| value may be zero length. Any errors will be treated as fatal if
+ * |fatal| is set. Returns 1 on success 0 on failure.
*/
int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret,
const unsigned char *label, size_t labellen,
const unsigned char *data, size_t datalen,
- unsigned char *out, size_t outlen)
+ unsigned char *out, size_t outlen, int fatal)
{
- const unsigned char label_prefix[] = "tls13 ";
+ static const unsigned char label_prefix[] = "tls13 ";
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
int ret;
size_t hkdflabellen;
size_t hashlen;
/*
- * 2 bytes for length of whole HkdfLabel + 1 byte for length of combined
- * prefix and label + bytes for the label itself + bytes for the hash
+ * 2 bytes for length of derived secret + 1 byte for length of combined
+ * prefix and label + bytes for the label itself + 1 byte length of hash
+ * + bytes for the hash itself
*/
unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
- + sizeof(label_prefix) + TLS13_MAX_LABEL_LEN
- + EVP_MAX_MD_SIZE];
+ + (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN
+ + 1 + EVP_MAX_MD_SIZE];
WPACKET pkt;
if (pctx == NULL)
return 0;
+ if (labellen > TLS13_MAX_LABEL_LEN) {
+ if (fatal) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
+ ERR_R_INTERNAL_ERROR);
+ } else {
+ /*
+ * Probably we have been called from SSL_export_keying_material(),
+ * or SSL_export_keying_material_early().
+ */
+ SSLerr(SSL_F_TLS13_HKDF_EXPAND, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
+ }
+ EVP_PKEY_CTX_free(pctx);
+ return 0;
+ }
+
hashlen = EVP_MD_size(md);
if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
|| !WPACKET_finish(&pkt)) {
EVP_PKEY_CTX_free(pctx);
WPACKET_cleanup(&pkt);
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
- ERR_R_INTERNAL_ERROR);
+ if (fatal)
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
+ ERR_R_INTERNAL_ERROR);
+ else
+ SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
return 0;
}
EVP_PKEY_CTX_free(pctx);
- if (ret != 0)
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
- ERR_R_INTERNAL_ERROR);
+ if (ret != 0) {
+ if (fatal)
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
+ ERR_R_INTERNAL_ERROR);
+ else
+ SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
+ }
return ret == 0;
}
static const unsigned char keylabel[] = "key";
return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
- NULL, 0, key, keylen);
+ NULL, 0, key, keylen, 1);
}
/*
static const unsigned char ivlabel[] = "iv";
return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
- NULL, 0, iv, ivlen);
+ NULL, 0, iv, ivlen, 1);
}
int tls13_derive_finishedkey(SSL *s, const EVP_MD *md,
static const unsigned char finishedlabel[] = "finished";
return tls13_hkdf_expand(s, md, secret, finishedlabel,
- sizeof(finishedlabel) - 1, NULL, 0, fin, finlen);
+ sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
}
/*
unsigned char *outsecret)
{
size_t mdlen, prevsecretlen;
+ int mdleni;
int ret;
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
static const char derived_secret_label[] = "derived";
return 0;
}
- mdlen = EVP_MD_size(md);
+ mdleni = EVP_MD_size(md);
+ /* Ensure cast to size_t is safe */
+ if (!ossl_assert(mdleni >= 0)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ mdlen = (size_t)mdleni;
if (insecret == NULL) {
insecret = default_zeros;
if (!tls13_hkdf_expand(s, md, prevsecret,
(unsigned char *)derived_secret_label,
sizeof(derived_secret_label) - 1, hash, mdlen,
- preextractsec, mdlen)) {
+ preextractsec, mdlen, 1)) {
/* SSLfatal() already called */
EVP_PKEY_CTX_free(pctx);
return 0;
EVP_PKEY *key = NULL;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
- if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
+ if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
+ /* SSLfatal() already called */
goto err;
+ }
- if (str == s->method->ssl3_enc->server_finished_label)
- key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
- s->server_finished_secret, hashlen);
- else
- key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
- s->client_finished_secret, hashlen);
+ if (str == s->method->ssl3_enc->server_finished_label) {
+ key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
+ s->server_finished_secret, hashlen);
+ } else if (SSL_IS_FIRST_HANDSHAKE(s)) {
+ key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
+ s->client_finished_secret, hashlen);
+ } else {
+ unsigned char finsecret[EVP_MAX_MD_SIZE];
+
+ if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
+ s->client_app_traffic_secret,
+ finsecret, hashlen))
+ goto err;
+
+ key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, finsecret,
+ hashlen);
+ OPENSSL_cleanse(finsecret, sizeof(finsecret));
+ }
if (key == NULL
|| ctx == NULL
|| EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
|| EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
- || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0)
+ || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_FINAL_FINISH_MAC,
+ ERR_R_INTERNAL_ERROR);
goto err;
+ }
ret = hashlen;
err:
{
const EVP_CIPHER *c;
const EVP_MD *hash;
- int mac_type = NID_undef;
s->session->cipher = s->s3->tmp.new_cipher;
- if (!ssl_cipher_get_evp
- (s->session, &c, &hash, &mac_type, NULL, NULL, 0)) {
+ if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, NULL, 0)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SETUP_KEY_BLOCK,
SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
return 0;
{
unsigned char key[EVP_MAX_KEY_LENGTH];
size_t ivlen, keylen, taglen;
- size_t hashlen = EVP_MD_size(md);
+ int hashleni = EVP_MD_size(md);
+ size_t hashlen;
+
+ /* Ensure cast to size_t is safe */
+ if (!ossl_assert(hashleni >= 0)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
+ ERR_R_EVP_LIB);
+ goto err;
+ }
+ hashlen = (size_t)hashleni;
if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
- secret, hashlen)) {
+ secret, hashlen, 1)) {
/* SSLfatal() already called */
goto err;
}
static const unsigned char server_application_traffic[] = "s ap traffic";
static const unsigned char exporter_master_secret[] = "exp master";
static const unsigned char resumption_master_secret[] = "res master";
+ static const unsigned char early_exporter_master_secret[] = "e exp master";
unsigned char *iv;
unsigned char secret[EVP_MAX_MD_SIZE];
unsigned char hashval[EVP_MAX_MD_SIZE];
RECORD_LAYER_reset_read_sequence(&s->rlayer);
} else {
+ s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
if (s->enc_write_ctx != NULL) {
EVP_CIPHER_CTX_reset(s->enc_write_ctx);
} else {
}
hashlen = hashlenui;
EVP_MD_CTX_free(mdctx);
+
+ if (!tls13_hkdf_expand(s, md, insecret,
+ early_exporter_master_secret,
+ sizeof(early_exporter_master_secret) - 1,
+ hashval, hashlen,
+ s->early_exporter_master_secret, hashlen,
+ 1)) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR,
+ SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
+ s->early_exporter_master_secret, hashlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
} else if (which & SSL3_CC_HANDSHAKE) {
insecret = s->handshake_secret;
finsecret = s->client_finished_secret;
if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
resumption_master_secret,
sizeof(resumption_master_secret) - 1,
- hashval, hashlen, s->session->master_key,
- hashlen)) {
- /* SSLfatal() already called */
- goto err;
- }
- s->session->master_key_length = hashlen;
-
- /* Now we create the exporter master secret */
- if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
- exporter_master_secret,
- sizeof(exporter_master_secret) - 1,
- hash, hashlen, s->exporter_master_secret,
- hashlen)) {
+ hashval, hashlen, s->resumption_master_secret,
+ hashlen, 1)) {
/* SSLfatal() already called */
goto err;
}
goto err;
}
- if (label == server_application_traffic)
+ if (label == server_application_traffic) {
memcpy(s->server_app_traffic_secret, secret, hashlen);
- else if (label == client_application_traffic)
+ /* Now we create the exporter master secret */
+ if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
+ exporter_master_secret,
+ sizeof(exporter_master_secret) - 1,
+ hash, hashlen, s->exporter_master_secret,
+ hashlen, 1)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
+ hashlen)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+ } else if (label == client_application_traffic)
memcpy(s->client_app_traffic_secret, secret, hashlen);
if (!ssl_log_secret(s, log_label, secret, hashlen)) {
goto err;
}
+ if (!s->server && label == client_early_traffic)
+ s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
+ else
+ s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
ret = 1;
err:
OPENSSL_cleanse(secret, sizeof(secret));
insecret = s->client_app_traffic_secret;
if (sending) {
+ s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
iv = s->write_iv;
ciph_ctx = s->enc_write_ctx;
RECORD_LAYER_reset_write_sequence(&s->rlayer);
memcpy(insecret, secret, hashlen);
+ s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
ret = 1;
err:
OPENSSL_cleanse(secret, sizeof(secret));
int tls13_alert_code(int code)
{
- if (code == SSL_AD_MISSING_EXTENSION)
+ /* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
+ if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED)
return code;
return tls1_alert_code(code);
unsigned int hashsize, datalen;
int ret = 0;
- if (ctx == NULL || !SSL_is_init_finished(s))
+ if (ctx == NULL || !ossl_statem_export_allowed(s))
goto err;
if (!use_context)
|| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
|| !tls13_hkdf_expand(s, md, s->exporter_master_secret,
(const unsigned char *)label, llen,
- data, datalen, exportsecret, hashsize)
+ data, datalen, exportsecret, hashsize, 0)
+ || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
+ sizeof(exporterlabel) - 1, hash, hashsize,
+ out, olen, 0))
+ goto err;
+
+ ret = 1;
+ err:
+ EVP_MD_CTX_free(ctx);
+ return ret;
+}
+
+int tls13_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
+ const char *label, size_t llen,
+ const unsigned char *context,
+ size_t contextlen)
+{
+ static const unsigned char exporterlabel[] = "exporter";
+ unsigned char exportsecret[EVP_MAX_MD_SIZE];
+ unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
+ const EVP_MD *md;
+ EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+ unsigned int hashsize, datalen;
+ int ret = 0;
+ const SSL_CIPHER *sslcipher;
+
+ if (ctx == NULL || !ossl_statem_export_early_allowed(s))
+ goto err;
+
+ if (!s->server && s->max_early_data > 0
+ && s->session->ext.max_early_data == 0)
+ sslcipher = SSL_SESSION_get0_cipher(s->psksession);
+ else
+ sslcipher = SSL_SESSION_get0_cipher(s->session);
+
+ md = ssl_md(sslcipher->algorithm2);
+
+ /*
+ * Calculate the hash value and store it in |data|. The reason why
+ * the empty string is used is that the definition of TLS-Exporter
+ * is like so:
+ *
+ * TLS-Exporter(label, context_value, key_length) =
+ * HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
+ * "exporter", Hash(context_value), key_length)
+ *
+ * Derive-Secret(Secret, Label, Messages) =
+ * HKDF-Expand-Label(Secret, Label,
+ * Transcript-Hash(Messages), Hash.length)
+ *
+ * Here Transcript-Hash is the cipher suite hash algorithm.
+ */
+ if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
+ || EVP_DigestUpdate(ctx, context, contextlen) <= 0
+ || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
+ || EVP_DigestInit_ex(ctx, md, NULL) <= 0
+ || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
+ || !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
+ (const unsigned char *)label, llen,
+ data, datalen, exportsecret, hashsize, 0)
|| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
sizeof(exporterlabel) - 1, hash, hashsize,
- out, olen))
+ out, olen, 0))
goto err;
ret = 1;
projects / openssl.git / blobdiff