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SUSE:SLE-12:Update
openssl
0005-client-reject-handshakes-with-DH-parameter...
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File 0005-client-reject-handshakes-with-DH-parameters-1024-bits.patch of Package openssl
From 63830384e90d9b36d2793d4891501ec024827433 Mon Sep 17 00:00:00 2001 From: Emilia Kasper <emilia@openssl.org> Date: Tue, 19 May 2015 12:05:22 +0200 Subject: [PATCH 5/5] client: reject handshakes with DH parameters < 1024 bits. Since the client has no way of communicating her supported parameter range to the server, connections to servers that choose weak DH will simply fail. Reviewed-by: Kurt Roeckx <kurt@openssl.org> --- CHANGES | 3 ++- ssl/s3_clnt.c | 22 ++++++++++++++++------ ssl/ssl.h | 1 + ssl/ssl_err.c | 1 + 4 files changed, 20 insertions(+), 7 deletions(-) Index: openssl-1.0.1i/CHANGES =================================================================== --- openssl-1.0.1i.orig/CHANGES 2015-06-12 13:25:24.308393444 +0200 +++ openssl-1.0.1i/CHANGES 2015-06-12 13:25:50.681740239 +0200 @@ -2,6 +2,9 @@ OpenSSL CHANGES _______________ + *) Reject DH handshakes with parameters shorter than 1024 bits. + [Kurt Roeckx and Emilia Kasper] + Changes between 1.0.1h and 1.0.1i [6 Aug 2014] *) Add support for TLS_FALLBACK_SCSV. Client applications doing fallback retries should call Index: openssl-1.0.1i/ssl/s3_clnt.c =================================================================== --- openssl-1.0.1i.orig/ssl/s3_clnt.c 2015-06-12 13:25:24.309393457 +0200 +++ openssl-1.0.1i/ssl/s3_clnt.c 2015-06-12 13:29:40.896761553 +0200 @@ -3322,26 +3322,34 @@ int ssl3_check_cert_and_algorithm(SSL *s } #endif #ifndef OPENSSL_NO_DH - if ((alg_k & SSL_kEDH) && - !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) - { - SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY); + if ((alg_k & SSL_kEDH) && dh == NULL) { + SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); goto f_err; - } - else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA)) + } + if ((alg_k & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT); goto f_err; } #ifndef OPENSSL_NO_DSA - else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA)) + if ((alg_k & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT); goto f_err; } #endif -#endif + /* Check DHE only: static DH not implemented. */ + if (alg_k & SSL_kEDH) { + int dh_size = BN_num_bits(dh->p); + if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 1024) + || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) { + SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL); + goto f_err; + } + } +#endif /* !OPENSSL_NO_DH */ + if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP)) { #ifndef OPENSSL_NO_RSA Index: openssl-1.0.1i/ssl/ssl.h =================================================================== --- openssl-1.0.1i.orig/ssl/ssl.h 2015-06-12 13:25:24.310393470 +0200 +++ openssl-1.0.1i/ssl/ssl.h 2015-06-12 13:30:24.446331928 +0200 @@ -2369,6 +2369,7 @@ void ERR_load_SSL_strings(void); #define SSL_R_DATA_LENGTH_TOO_LONG 146 #define SSL_R_DECRYPTION_FAILED 147 #define SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC 281 +#define SSL_R_DH_KEY_TOO_SMALL 372 #define SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG 148 #define SSL_R_DIGEST_CHECK_FAILED 149 #define SSL_R_DTLS_MESSAGE_TOO_BIG 334 Index: openssl-1.0.1i/ssl/ssl_err.c =================================================================== --- openssl-1.0.1i.orig/ssl/ssl_err.c 2015-06-12 13:25:24.311393483 +0200 +++ openssl-1.0.1i/ssl/ssl_err.c 2015-06-12 13:30:48.525647135 +0200 @@ -363,6 +363,7 @@ static ERR_STRING_DATA SSL_str_reasons[] {ERR_REASON(SSL_R_DATA_LENGTH_TOO_LONG) ,"data length too long"}, {ERR_REASON(SSL_R_DECRYPTION_FAILED) ,"decryption failed"}, {ERR_REASON(SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC),"decryption failed or bad record mac"}, +{ERR_REASON(SSL_R_DH_KEY_TOO_SMALL), "dh key too small"}, {ERR_REASON(SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG),"dh public value length is wrong"}, {ERR_REASON(SSL_R_DIGEST_CHECK_FAILED) ,"digest check failed"}, {ERR_REASON(SSL_R_DTLS_MESSAGE_TOO_BIG) ,"dtls message too big"},
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