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openssl
openssl-CVE-2015-0204.patch
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File openssl-CVE-2015-0204.patch of Package openssl
commit 37580f43b5a39f5f4e920d17273fab9713d3a744 Author: Dr. Stephen Henson <steve@openssl.org> Date: Thu Oct 23 17:09:57 2014 +0100 Only allow ephemeral RSA keys in export ciphersuites. OpenSSL clients would tolerate temporary RSA keys in non-export ciphersuites. It also had an option SSL_OP_EPHEMERAL_RSA which enabled this server side. Remove both options as they are a protocol violation. Thanks to Karthikeyan Bhargavan for reporting this issue. (CVE-2015-0204) Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tim Hudson <tjh@openssl.org> (cherry picked from commit 4b4c1fcc88aec8c9e001b0a0077d3cd4de1ed0e6) Conflicts: doc/ssl/SSL_CTX_set_options.pod Index: openssl-1.0.1i/doc/ssl/SSL_CTX_set_options.pod =================================================================== --- openssl-1.0.1i.orig/doc/ssl/SSL_CTX_set_options.pod 2015-01-08 13:44:59.674089192 +0100 +++ openssl-1.0.1i/doc/ssl/SSL_CTX_set_options.pod 2015-01-08 13:45:07.828184260 +0100 @@ -158,15 +158,7 @@ temporary/ephemeral DH parameters are us =item SSL_OP_EPHEMERAL_RSA -Always use ephemeral (temporary) RSA key when doing RSA operations -(see L<SSL_CTX_set_tmp_rsa_callback(3)|SSL_CTX_set_tmp_rsa_callback(3)>). -According to the specifications this is only done, when a RSA key -can only be used for signature operations (namely under export ciphers -with restricted RSA keylength). By setting this option, ephemeral -RSA keys are always used. This option breaks compatibility with the -SSL/TLS specifications and may lead to interoperability problems with -clients and should therefore never be used. Ciphers with EDH (ephemeral -Diffie-Hellman) key exchange should be used instead. +This option is no longer implemented and is treated as no op. =item SSL_OP_CIPHER_SERVER_PREFERENCE Index: openssl-1.0.1i/doc/ssl/SSL_CTX_set_tmp_rsa_callback.pod =================================================================== --- openssl-1.0.1i.orig/doc/ssl/SSL_CTX_set_tmp_rsa_callback.pod 2015-01-08 13:44:59.674089192 +0100 +++ openssl-1.0.1i/doc/ssl/SSL_CTX_set_tmp_rsa_callback.pod 2015-01-08 13:45:07.829184272 +0100 @@ -74,21 +74,14 @@ exchange and use EDH (Ephemeral Diffie-H in order to achieve forward secrecy (see L<SSL_CTX_set_tmp_dh_callback(3)|SSL_CTX_set_tmp_dh_callback(3)>). -On OpenSSL servers ephemeral RSA key exchange is therefore disabled by default -and must be explicitly enabled using the SSL_OP_EPHEMERAL_RSA option of -L<SSL_CTX_set_options(3)|SSL_CTX_set_options(3)>, violating the TLS/SSL -standard. When ephemeral RSA key exchange is required for export ciphers, -it will automatically be used without this option! - -An application may either directly specify the key or can supply the key via -a callback function. The callback approach has the advantage, that the -callback may generate the key only in case it is actually needed. As the -generation of a RSA key is however costly, it will lead to a significant -delay in the handshake procedure. Another advantage of the callback function -is that it can supply keys of different size (e.g. for SSL_OP_EPHEMERAL_RSA -usage) while the explicit setting of the key is only useful for key size of -512 bits to satisfy the export restricted ciphers and does give away key length -if a longer key would be allowed. +An application may either directly specify the key or can supply the key via a +callback function. The callback approach has the advantage, that the callback +may generate the key only in case it is actually needed. As the generation of a +RSA key is however costly, it will lead to a significant delay in the handshake +procedure. Another advantage of the callback function is that it can supply +keys of different size while the explicit setting of the key is only useful for +key size of 512 bits to satisfy the export restricted ciphers and does give +away key length if a longer key would be allowed. The B<tmp_rsa_callback> is called with the B<keylength> needed and the B<is_export> information. The B<is_export> flag is set, when the Index: openssl-1.0.1i/ssl/d1_srvr.c =================================================================== --- openssl-1.0.1i.orig/ssl/d1_srvr.c 2015-01-08 13:44:59.675089204 +0100 +++ openssl-1.0.1i/ssl/d1_srvr.c 2015-01-08 13:45:07.829184272 +0100 @@ -450,24 +450,15 @@ int dtls1_accept(SSL *s) case SSL3_ST_SW_KEY_EXCH_B: alg_k = s->s3->tmp.new_cipher->algorithm_mkey; - /* clear this, it may get reset by - * send_server_key_exchange */ - if ((s->options & SSL_OP_EPHEMERAL_RSA) -#ifndef OPENSSL_NO_KRB5 - && !(alg_k & SSL_kKRB5) -#endif /* OPENSSL_NO_KRB5 */ - ) - /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key - * even when forbidden by protocol specs - * (handshake may fail as clients are not required to - * be able to handle this) */ - s->s3->tmp.use_rsa_tmp=1; - else - s->s3->tmp.use_rsa_tmp=0; + /* + * clear this, it may get reset by + * send_server_key_exchange + */ + s->s3->tmp.use_rsa_tmp=0; /* only send if a DH key exchange or * RSA but we have a sign only certificate */ - if (s->s3->tmp.use_rsa_tmp + if (0 /* PSK: send ServerKeyExchange if PSK identity * hint if provided */ #ifndef OPENSSL_NO_PSK Index: openssl-1.0.1i/ssl/s3_clnt.c =================================================================== --- openssl-1.0.1i.orig/ssl/s3_clnt.c 2015-01-08 13:44:59.675089204 +0100 +++ openssl-1.0.1i/ssl/s3_clnt.c 2015-01-08 13:45:07.830184283 +0100 @@ -1505,6 +1505,13 @@ int ssl3_get_key_exchange(SSL *s) #ifndef OPENSSL_NO_RSA if (alg_k & SSL_kRSA) { + /* Temporary RSA keys only allowed in export ciphersuites */ + if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) + { + al=SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNEXPECTED_MESSAGE); + goto f_err; + } if ((rsa=RSA_new()) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); Index: openssl-1.0.1i/ssl/s3_srvr.c =================================================================== --- openssl-1.0.1i.orig/ssl/s3_srvr.c 2015-01-08 13:44:59.676089215 +0100 +++ openssl-1.0.1i/ssl/s3_srvr.c 2015-01-08 13:45:07.830184283 +0100 @@ -441,20 +441,11 @@ int ssl3_accept(SSL *s) case SSL3_ST_SW_KEY_EXCH_B: alg_k = s->s3->tmp.new_cipher->algorithm_mkey; - /* clear this, it may get reset by - * send_server_key_exchange */ - if ((s->options & SSL_OP_EPHEMERAL_RSA) -#ifndef OPENSSL_NO_KRB5 - && !(alg_k & SSL_kKRB5) -#endif /* OPENSSL_NO_KRB5 */ - ) - /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key - * even when forbidden by protocol specs - * (handshake may fail as clients are not required to - * be able to handle this) */ - s->s3->tmp.use_rsa_tmp=1; - else - s->s3->tmp.use_rsa_tmp=0; + /* + * clear this, it may get reset by + * send_server_key_exchange + */ + s->s3->tmp.use_rsa_tmp=0; /* only send if a DH key exchange, fortezza or @@ -468,7 +459,7 @@ int ssl3_accept(SSL *s) * server certificate contains the server's * public key for key exchange. */ - if (s->s3->tmp.use_rsa_tmp + if (0 /* PSK: send ServerKeyExchange if PSK identity * hint if provided */ #ifndef OPENSSL_NO_PSK Index: openssl-1.0.1i/ssl/ssl.h =================================================================== --- openssl-1.0.1i.orig/ssl/ssl.h 2015-01-08 13:44:59.677089227 +0100 +++ openssl-1.0.1i/ssl/ssl.h 2015-01-08 13:45:07.831184295 +0100 @@ -600,9 +600,8 @@ struct ssl_session_st #define SSL_OP_SINGLE_ECDH_USE 0x00080000L /* If set, always create a new key when using tmp_dh parameters */ #define SSL_OP_SINGLE_DH_USE 0x00100000L -/* Set to always use the tmp_rsa key when doing RSA operations, - * even when this violates protocol specs */ -#define SSL_OP_EPHEMERAL_RSA 0x00200000L +/* Does nothing: retained for compatibiity */ +#define SSL_OP_EPHEMERAL_RSA 0x0 /* Set on servers to choose the cipher according to the server's * preferences */ #define SSL_OP_CIPHER_SERVER_PREFERENCE 0x00400000L
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