294 lines
9.9 KiB
Groff
294 lines
9.9 KiB
Groff
.\" $NetBSD: SSL_CTX_set_options.3,v 1.2 2002/02/07 07:00:41 ross Exp $
|
|
.\"
|
|
.\" Automatically generated by Pod::Man version 1.02
|
|
.\" Thu Apr 12 19:27:22 2001
|
|
.\"
|
|
.\" 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++. Capital omega is used
|
|
.\" to do unbreakable dashes and therefore won't be available. \*(C` and
|
|
.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<>
|
|
.tr \(*W-|\(bv\*(Tr
|
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
|
.ie n \{\
|
|
. ds -- \(*W-
|
|
. ds PI pi
|
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
|
. ds L" ""
|
|
. ds R" ""
|
|
. ds C` `
|
|
. ds C' '
|
|
'br\}
|
|
.el\{\
|
|
. ds -- \|\(em\|
|
|
. ds PI \(*p
|
|
. ds L" ``
|
|
. ds R" ''
|
|
'br\}
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr
|
|
.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
|
|
.\" index entries marked with X<> in POD. Of course, you'll have to process
|
|
.\" the output yourself in some meaningful fashion.
|
|
.if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
. .
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.\"
|
|
.\" For nroff, turn off justification. Always turn off hyphenation; it
|
|
.\" makes way too many mistakes in technical documents.
|
|
.hy 0
|
|
.if n .na
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
.bd B 3
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ======================================================================
|
|
.\"
|
|
.IX Title "SSL_CTX_set_options 3"
|
|
.TH SSL_CTX_set_options 3 "0.9.6a" "2001-04-12" "OpenSSL"
|
|
.UC
|
|
.SH "NAME"
|
|
SSL_CTX_set_options, SSL_set_options, SSL_CTX_get_options, SSL_get_options \- manipulate \s-1SSL\s0 engine options
|
|
.SH "LIBRARY"
|
|
libcrypto, -lcrypto
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include \*[Lt]openssl/ssl.h\*[Gt]
|
|
.Ve
|
|
.Vb 2
|
|
\& long SSL_CTX_set_options(SSL_CTX *ctx, long options);
|
|
\& long SSL_set_options(SSL *ssl, long options);
|
|
.Ve
|
|
.Vb 2
|
|
\& long SSL_CTX_get_options(SSL_CTX *ctx);
|
|
\& long SSL_get_options(SSL *ssl);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fISSL_CTX_set_options()\fR adds the options set via bitmask in \fBoptions\fR to \fBctx\fR.
|
|
Options already set before are not cleared.
|
|
.PP
|
|
\&\fISSL_set_options()\fR adds the options set via bitmask in \fBoptions\fR to \fBssl\fR.
|
|
Options already set before are not cleared.
|
|
.PP
|
|
\&\fISSL_CTX_get_options()\fR returns the options set for \fBctx\fR.
|
|
.PP
|
|
\&\fISSL_get_options()\fR returns the options set for \fBssl\fR.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
The behaviour of the \s-1SSL\s0 library can be changed by setting several options.
|
|
The options are coded as bitmasks and can be combined by a logical \fBor\fR
|
|
operation (|). Options can only be added but can never be reset.
|
|
.PP
|
|
During a handshake, the option settings of the \s-1SSL\s0 object 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 \s-1DH\s0 parameters.
|
|
.Ip "\s-1SSL_OP_EPHEMERAL_RSA\s0" 4
|
|
.IX Item "SSL_OP_EPHEMERAL_RSA"
|
|
Also use the temporary \s-1RSA\s0 key when doing \s-1RSA\s0 operations.
|
|
.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_NON_EXPORT_FIRST\s0" 4
|
|
.IX Item "SSL_OP_NON_EXPORT_FIRST"
|
|
On servers try to use non-export (stronger) ciphers first. This option does
|
|
not work under all circumstances (in the code it is declared \*(L"broken\*(R").
|
|
.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)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\s-1SSL_OP_TLS_ROLLBACK_BUG\s0 has been added in OpenSSL 0.9.6.
|