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Diffstat (limited to 'secure/lib/libcrypto/man/SSL_CTX_set_options.3')
| -rw-r--r-- | secure/lib/libcrypto/man/SSL_CTX_set_options.3 | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/SSL_CTX_set_options.3 b/secure/lib/libcrypto/man/SSL_CTX_set_options.3 new file mode 100644 index 0000000..8c39cd4 --- /dev/null +++ b/secure/lib/libcrypto/man/SSL_CTX_set_options.3 @@ -0,0 +1,309 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:20:23 2002 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. 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Options can only be added but can never be reset. +.PP +\&\fISSL_CTX_set_options()\fR and \fISSL_set_options()\fR affect the (external) +protocol behaviour of the \s-1SSL\s0 library. The (internal) behaviour of +the \s-1API\s0 can be changed by using the similar +SSL_CTX_set_modes(3) and \fISSL_set_modes()\fR functions. +.PP +During a handshake, the option settings of the \s-1SSL\s0 object are used. When +a new \s-1SSL\s0 object is created from a context using \fISSL_new()\fR, the current +option setting is copied. Changes to \fBctx\fR do not affect already created +\&\s-1SSL\s0 objects. \fISSL_clear()\fR does not affect the settings. +.PP +The following \fBbug workaround\fR options are available: +.Ip "\s-1SSL_OP_MICROSOFT_SESS_ID_BUG\s0" 4 +.IX Item "SSL_OP_MICROSOFT_SESS_ID_BUG" +www.microsoft.com \- when talking SSLv2, if session-id reuse is +performed, the session-id passed back in the server-finished message +is different from the one decided upon. +.Ip "\s-1SSL_OP_NETSCAPE_CHALLENGE_BUG\s0" 4 +.IX Item "SSL_OP_NETSCAPE_CHALLENGE_BUG" +Netscape-Commerce/1.12, when talking SSLv2, accepts a 32 byte +challenge but then appears to only use 16 bytes when generating the +encryption keys. Using 16 bytes is ok but it should be ok to use 32. +According to the SSLv3 spec, one should use 32 bytes for the challenge +when operating in SSLv2/v3 compatibility mode, but as mentioned above, +this breaks this server so 16 bytes is the way to go. +.Ip "\s-1SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG\s0" 4 +.IX Item "SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG" +ssl3.netscape.com:443, first a connection is established with \s-1RC4\-MD5\s0. +If it is then resumed, we end up using \s-1DES-CBC3\-SHA\s0. It should be +\&\s-1RC4\-MD5\s0 according to 7.6.1.3, 'cipher_suite'. +.Sp +Netscape-Enterprise/2.01 (https://merchant.netscape.com) has this bug. +It only really shows up when connecting via SSLv2/v3 then reconnecting +via SSLv3. The cipher list changes.... +.Sp +\&\s-1NEW\s0 \s-1INFORMATION\s0. Try connecting with a cipher list of just +\&\s-1DES-CBC-SHA:RC4\-MD5\s0. For some weird reason, each new connection uses +\&\s-1RC4\-MD5\s0, but a re-connect tries to use \s-1DES-CBC-SHA\s0. So netscape, when +doing a re-connect, always takes the first cipher in the cipher list. +.Ip "\s-1SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG\s0" 4 +.IX Item "SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG" +\&... +.Ip "\s-1SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER\s0" 4 +.IX Item "SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER" +\&... +.Ip "\s-1SSL_OP_MSIE_SSLV2_RSA_PADDING\s0" 4 +.IX Item "SSL_OP_MSIE_SSLV2_RSA_PADDING" +\&... +.Ip "\s-1SSL_OP_SSLEAY_080_CLIENT_DH_BUG\s0" 4 +.IX Item "SSL_OP_SSLEAY_080_CLIENT_DH_BUG" +\&... +.Ip "\s-1SSL_OP_TLS_D5_BUG\s0" 4 +.IX Item "SSL_OP_TLS_D5_BUG" +\&... +.Ip "\s-1SSL_OP_TLS_BLOCK_PADDING_BUG\s0" 4 +.IX Item "SSL_OP_TLS_BLOCK_PADDING_BUG" +\&... +.Ip "\s-1SSL_OP_TLS_ROLLBACK_BUG\s0" 4 +.IX Item "SSL_OP_TLS_ROLLBACK_BUG" +Disable version rollback attack detection. +.Sp +During the client key exchange, the client must send the same information +about acceptable \s-1SSL/TLS\s0 protocol levels as during the first hello. Some +clients violate this rule by adapting to the server's answer. (Example: +the client sends a SSLv2 hello and accepts up to SSLv3.1=TLSv1, the server +only understands up to SSLv3. In this case the client must still use the +same SSLv3.1=TLSv1 announcement. Some clients step down to SSLv3 with respect +to the server's answer and violate the version rollback protection.) +.Ip "\s-1SSL_OP_ALL\s0" 4 +.IX Item "SSL_OP_ALL" +All of the above bug workarounds. +.PP +It is save and recommended to use \s-1SSL_OP_ALL\s0 to enable the bug workaround +options. +.PP +The following \fBmodifying\fR options are available: +.Ip "\s-1SSL_OP_SINGLE_DH_USE\s0" 4 +.IX Item "SSL_OP_SINGLE_DH_USE" +Always create a new key when using temporary/ephemeral \s-1DH\s0 parameters +(see SSL_CTX_set_tmp_dh_callback(3)). +This option must be used to prevent small subgroup attacks, when +the \s-1DH\s0 parameters were not generated using \*(L"strong\*(R" primes +(e.g. when using DSA-parameters, see dhparam(1)). +If \*(L"strong\*(R" primes were used, it is not strictly necessary to generate +a new \s-1DH\s0 key during each handshake but it is also recommended. +\&\s-1SSL_OP_SINGLE_DH_USE\s0 should therefore be enabled whenever +temporary/ephemeral \s-1DH\s0 parameters are used. +.Ip "\s-1SSL_OP_EPHEMERAL_RSA\s0" 4 +.IX Item "SSL_OP_EPHEMERAL_RSA" +Always use ephemeral (temporary) \s-1RSA\s0 key when doing \s-1RSA\s0 operations +(see SSL_CTX_set_tmp_rsa_callback(3)). +According to the specifications this is only done, when a \s-1RSA\s0 key +can only be used for signature operations (namely under export ciphers +with restricted \s-1RSA\s0 keylength). By setting this option, ephemeral +\&\s-1RSA\s0 keys are always used. This option breaks compatibility with the +\&\s-1SSL/TLS\s0 specifications and may lead to interoperability problems with +clients and should therefore never be used. Ciphers with \s-1EDH\s0 (ephemeral +Diffie-Hellman) key exchange should be used instead. +.Ip "\s-1SSL_OP_PKCS1_CHECK_1\s0" 4 +.IX Item "SSL_OP_PKCS1_CHECK_1" +\&... +.Ip "\s-1SSL_OP_PKCS1_CHECK_2\s0" 4 +.IX Item "SSL_OP_PKCS1_CHECK_2" +\&... +.Ip "\s-1SSL_OP_NETSCAPE_CA_DN_BUG\s0" 4 +.IX Item "SSL_OP_NETSCAPE_CA_DN_BUG" +If we accept a netscape connection, demand a client cert, have a +non-self-sighed \s-1CA\s0 which does not have it's \s-1CA\s0 in netscape, and the +browser has a cert, it will crash/hang. Works for 3.x and 4.xbeta +.Ip "\s-1SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG\s0" 4 +.IX Item "SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG" +\&... +.Ip "SSL_OP_NO_SSLv2" 4 +.IX Item "SSL_OP_NO_SSLv2" +Do not use the SSLv2 protocol. +.Ip "SSL_OP_NO_SSLv3" 4 +.IX Item "SSL_OP_NO_SSLv3" +Do not use the SSLv3 protocol. +.Ip "SSL_OP_NO_TLSv1" 4 +.IX Item "SSL_OP_NO_TLSv1" +Do not use the TLSv1 protocol. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fISSL_CTX_set_options()\fR and \fISSL_set_options()\fR return the new options bitmask +after adding \fBoptions\fR. +.PP +\&\fISSL_CTX_get_options()\fR and \fISSL_get_options()\fR return the current bitmask. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +ssl(3), SSL_new(3), SSL_clear(3), +SSL_CTX_set_tmp_dh_callback(3), +SSL_CTX_set_tmp_rsa_callback(3), +dhparam(1) +.SH "HISTORY" +.IX Header "HISTORY" +\&\s-1SSL_OP_TLS_ROLLBACK_BUG\s0 has been added in OpenSSL 0.9.6. |
