From f803a417f7ad13a22d250aeba44ba85911a2b593 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Thu, 4 Jun 2015 11:41:30 +0100 Subject: [PATCH] Clean Kerberos pre-master secret Ensure the Kerberos pre-master secret has OPENSSL_cleanse called on it. With thanks to the Open Crypto Audit Project for reporting this issue. Reviewed-by: Rich Salz (cherry picked from commit 4e3dbe37ca39fa68b6949fbde62f3ec0f0584f7e) --- ssl/s3_srvr.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c index fe7f6850ba..8749ea2434 100644 --- a/ssl/s3_srvr.c +++ b/ssl/s3_srvr.c @@ -2009,6 +2009,7 @@ int ssl3_get_client_key_exchange(SSL *s) int padl, outl; krb5_timestamp authtime = 0; krb5_ticket_times ttimes; + int kerr = 0; EVP_CIPHER_CTX_init(&ciph_ctx); @@ -2111,23 +2112,27 @@ int ssl3_get_client_key_exchange(SSL *s) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); - goto err; + kerr = 1; + goto kclean; } if (outl > SSL_MAX_MASTER_KEY_LENGTH) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); - goto err; + kerr = 1; + goto kclean; } if (!EVP_DecryptFinal_ex(&ciph_ctx, &(pms[outl]), &padl)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); - goto err; + kerr = 1; + goto kclean; } outl += padl; if (outl > SSL_MAX_MASTER_KEY_LENGTH) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); - goto err; + kerr = 1; + goto kclean; } if (!((pms[0] == (s->client_version >> 8)) && (pms[1] == (s->client_version & 0xff)))) { @@ -2144,7 +2149,8 @@ int ssl3_get_client_key_exchange(SSL *s) if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_AD_DECODE_ERROR); - goto err; + kerr = 1; + goto kclean; } } @@ -2170,6 +2176,11 @@ int ssl3_get_client_key_exchange(SSL *s) * kssl_ctx = kssl_ctx_free(kssl_ctx); * if (s->kssl_ctx) s->kssl_ctx = NULL; */ + + kclean: + OPENSSL_cleanse(pms, sizeof(pms)); + if (kerr) + goto err; } else #endif /* OPENSSL_NO_KRB5 */ -- 2.25.1