211 lines
5.4 KiB
Groff
211 lines
5.4 KiB
Groff
.\" $FreeBSD$
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.\" $OpenBSD: pkg_sign.1,v 1.6 2000/04/15 02:15:20 aaron Exp $
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.\"
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.\" Copyright (c) 1999 Marc Espie.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Marc Espie for the OpenBSD
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.\" Project.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
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.\" PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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.\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.Dd September 24, 1999
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.Dt PKG_SIGN 1
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.Os
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.Sh NAME
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.Nm pkg_sign ,
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.Nm pkg_check
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.Nd handle package signatures
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.Sh SYNOPSIS
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.Nm
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.Op Fl sc
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.Op Fl t Ar type
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.Op Fl u Ar id
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.Op Fl k Ar key
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.Op Ar
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.Nm pkg_check
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.Op Fl sc
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.Op Fl u Ar id
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.Op Fl k Ar cert
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility embeds a cryptographic signature within a gzip file
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.Ar file .
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.Ar type
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can be
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.Cm pgp
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(default),
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.Cm sha1 ,
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or
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.Cm x509 .
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If
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.Ar type
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is
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.Cm pgp ,
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it will always prompt you for a passphrase to unlock your private
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pgp key, even if you don't use a passphrase (which is a bad idea, anyway).
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If
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.Ar type
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is
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.Cm sha1 ,
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you must supply an
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.Ar id ,
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which will be recorded as the name of the package, and printed as the
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SHA1 checksum.
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.Pp
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The
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.Nm pkg_check
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utility checks that cryptographic signature.
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It currently disregards
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.Ar type
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and checks only the topmost signature.
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For
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.Cm sha1 ,
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it checksums the file
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and verifies that the result matches the list of checksums recorded in
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.Pa /var/db/pkg/SHA1 .
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.Pp
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Options
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.Fl s
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and
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.Fl c
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can be used to force package signing or signature checking mode.
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.Pp
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For
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.Cm pgp ,
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the
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.Ar id
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to use to sign the package or verify the signature can be forced with
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.Fl u .
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.Pp
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For
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.Cm x509 ,
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the signing key or verification certificate may be
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specified with the
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.Fl k
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option.
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If not specified, packages are signed or verified with the
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default keys and certificates documented below.
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.Pp
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If
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.Ar file
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is a single dash
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.Pq Sq Fl
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or absent,
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.Nm
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reads from the standard input.
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.Pp
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Package signing uses a feature of the gzip format, namely that one can
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set a flag
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.Dv EXTRA_FIELD
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in the gzip header and store extra data between the gzip header and the
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compressed file proper.
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The
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.Ox
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signing scheme uses eight bytes markers such
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.Sq Li SIGPGP
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+ length or
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.Sq CKSHA1
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+ length for its signatures (those markers are conveniently
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eight bytes long).
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.Sh DIAGNOSTICS
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The
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.Nm
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and
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.Nm pkg_check
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utilities return with an exit code >0 if anything went wrong for any
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.Ar file .
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For
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.Nm pkg_check ,
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this usually indicates that the package is not signed, or that the
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signature is forged.
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.Bl -diag
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.It "File %s is already signed"
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There is a signature embedded within the gzip file already.
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The
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.Nm
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utility currently does not handle multiple signatures.
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.It "File %s is not a signed gzip file"
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This is an unsigned package.
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.It "File %s is not a gzip file"
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The program couldn't find a proper gzip header.
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.It "File %s contains an unknown extension"
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The extended area of the gzip file has been used for an unknown purpose.
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.It "File %s uses old signatures, no longer supported"
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The gzip file uses a very early version of package signing that was
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substantially slower.
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.El
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.Sh BUGS
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The
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.Xr pgp 1
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utility is an ill-designed program, which is hard to interface with.
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For instance, the `separate signing scheme' it pretends to offer is
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useless, as it can't be used with pipes, so that
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.Nm pgp_sign
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needs to kludge it by knowing the length of a pgp signature, and invoking
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pgp in `seamless' signature mode, without compression of the main file,
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and just retrieving the signature.
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.Pp
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The checking scheme is little less convoluted, namely we rebuild the file
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that pgp expects on the fly.
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.Pp
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Paths to
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.Nm pgp
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and
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the checksum file are hard-coded to avoid tampering and hinder flexibility.
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.Sh FILES
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.Bl -tag -width "/usr/local/bin/pgp" -compact
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.It Pa file.sign
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Temporary file built by
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.Nm
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from
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.Ar file .
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.It Pa /usr/local/bin/pgp
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Default path to
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.Xr pgp 1 .
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.It Pa /var/db/pkgs/SHA1
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Recorded checksums.
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.It Pa /etc/ssl/pkg.key
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Default package signing key.
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.It Pa /etc/ssl/pkg.crt
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Default package verification certificate(s).
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.El
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.Sh SEE ALSO
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.Xr gzip 1 ,
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.Xr pgp 1 ,
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.Xr pkg_add 1 ,
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.Xr sha1 1
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.Sh AUTHORS
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.An -nosplit
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A
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.Nm
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utility was created by
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.An Marc Espie
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for the
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.Ox
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Project.
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X.509 signatures and
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.Fx
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support added by
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.An Wes Peters Aq wes@softweyr.com .
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