218 lines
6.9 KiB
Groff
218 lines
6.9 KiB
Groff
.\" $NetBSD: SSL_CTX_set_default_passwd_cb.3,v 1.6 2002/08/09 16:15:41 itojun Exp $
|
|
.\"
|
|
.\" Automatically generated by Pod::Man version 1.02
|
|
.\" Sat Aug 10 00:58:04 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++. 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_default_passwd_cb 3"
|
|
.TH SSL_CTX_set_default_passwd_cb 3 "0.9.6g" "2002-06-10" "OpenSSL"
|
|
.UC
|
|
.SH "NAME"
|
|
SSL_CTX_set_default_passwd_cb, SSL_CTX_set_default_passwd_cb_userdata \- set passwd callback for encrypted \s-1PEM\s0 file handling
|
|
.SH "LIBRARY"
|
|
libcrypto, -lcrypto
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/ssl.h>
|
|
.Ve
|
|
.Vb 2
|
|
\& void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb);
|
|
\& void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u);
|
|
.Ve
|
|
.Vb 1
|
|
\& int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fISSL_CTX_set_default_passwd_cb()\fR sets the default password callback called
|
|
when loading/storing a \s-1PEM\s0 certificate with encryption.
|
|
.PP
|
|
\&\fISSL_CTX_set_default_passwd_cb_userdata()\fR sets a pointer to \fBuserdata\fR which
|
|
will be provided to the password callback on invocation.
|
|
.PP
|
|
The \fIpem_passwd_cb()\fR, which must be provided by the application, hands back the
|
|
password to be used during decryption. On invocation a pointer to \fBuserdata\fR
|
|
is provided. The pem_passwd_cb must write the password into the provided buffer
|
|
\&\fBbuf\fR which is of size \fBsize\fR. The actual length of the password must
|
|
be returned to the calling function. \fBrwflag\fR indicates whether the
|
|
callback is used for reading/decryption (rwflag=0) or writing/encryption
|
|
(rwflag=1).
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
When loading or storing private keys, a password might be supplied to
|
|
protect the private key. The way this password can be supplied may depend
|
|
on the application. If only one private key is handled, it can be practical
|
|
to have \fIpem_passwd_cb()\fR handle the password dialog interactively. If several
|
|
keys have to be handled, it can be practical to ask for the password once,
|
|
then keep it in memory and use it several times. In the last case, the
|
|
password could be stored into the \fBuserdata\fR storage and the
|
|
\&\fIpem_passwd_cb()\fR only returns the password already stored.
|
|
.PP
|
|
When asking for the password interactively, \fIpem_passwd_cb()\fR can use
|
|
\&\fBrwflag\fR to check, whether an item shall be encrypted (rwflag=1).
|
|
In this case the password dialog may ask for the same password twice
|
|
for comparison in order to catch typos, that would make decryption
|
|
impossible.
|
|
.PP
|
|
Other items in \s-1PEM\s0 formatting (certificates) can also be encrypted, it is
|
|
however not usual, as certificate information is considered public.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fISSL_CTX_set_default_passwd_cb()\fR and \fISSL_CTX_set_default_passwd_cb_userdata()\fR
|
|
do not provide diagnostic information.
|
|
.SH "EXAMPLES"
|
|
.IX Header "EXAMPLES"
|
|
The following example returns the password provided as \fBuserdata\fR to the
|
|
calling function. The password is considered to be a '\e0' terminated
|
|
string. If the password does not fit into the buffer, the password is
|
|
truncated.
|
|
.PP
|
|
.Vb 6
|
|
\& int pem_passwd_cb(char *buf, int size, int rwflag, void *password)
|
|
\& {
|
|
\& strncpy(buf, (char *)(password), size);
|
|
\& buf[size - 1] = '\e0';
|
|
\& return(strlen(buf));
|
|
\& }
|
|
.Ve
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
ssl(3),
|
|
SSL_CTX_use_certificate(3)
|