Initial import
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121
COPYING
Normal file
121
COPYING
Normal file
@ -0,0 +1,121 @@
|
||||
Creative Commons Legal Code
|
||||
|
||||
CC0 1.0 Universal
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||||
|
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CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
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LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
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54
Makefile
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54
Makefile
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@ -0,0 +1,54 @@
|
||||
# cassh - Manager for an OpenSSH Certification Authority
|
||||
#
|
||||
# Written in 2022 by Lucas
|
||||
#
|
||||
# To the extent possible under law, the author(s) have dedicated all
|
||||
# copyright and related and neighboring rights to this software to the
|
||||
# public domain worldwide. This software is distributed without any
|
||||
# warranty.
|
||||
#
|
||||
# You should have received a copy of the CC0 Public Domain Dedication
|
||||
# along with this software. If not, see
|
||||
# <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||
.POSIX:
|
||||
.SUFFIXES:
|
||||
.SUFFIXES: .sh
|
||||
|
||||
.sh:
|
||||
cp $< $@
|
||||
chmod a+x $@
|
||||
|
||||
P = cassh
|
||||
V = 0
|
||||
|
||||
PREFIX = /usr/local
|
||||
MANPREFIX = ${PREFIX}/man
|
||||
|
||||
BIN = cassh
|
||||
MAN1 = ${BIN:=.1}
|
||||
SRC = ${BIN:=.sh} ${MAN1}
|
||||
|
||||
DIST = ${SRC} COPYING Makefile README
|
||||
|
||||
all: ${BIN}
|
||||
|
||||
test: all
|
||||
prove -p
|
||||
|
||||
clean:
|
||||
rm -f ${BIN} ${P}-${V}.tgz
|
||||
|
||||
dist: clean
|
||||
pax -ws ',^,${P}-${V}/,' ${DIST} | gzip >${P}-${V}.tgz
|
||||
|
||||
install: all
|
||||
mkdir -p ${PREFIX}/bin
|
||||
cp -f ${BIN} ${PREFIX}/bin
|
||||
cd ${PREFIX}/bin && chmod 555 ${BIN}
|
||||
mkdir -p ${MANPREFIX}/man1
|
||||
cp -f ${MAN1} ${MANPREFIX}/man1
|
||||
cd ${MANPREFIX}/man1 && chmod 444 ${MAN1}
|
||||
|
||||
uninstall:
|
||||
cd ${PREFIX}/bin && rm -f ${BIN}
|
||||
cd ${MANPREFIX}/man1 && rm -f ${MAN1}
|
||||
4
README
Normal file
4
README
Normal file
@ -0,0 +1,4 @@
|
||||
cassh
|
||||
=====
|
||||
|
||||
Manager for an OpenSSH Certification Authority.
|
||||
136
cassh.1
Normal file
136
cassh.1
Normal file
@ -0,0 +1,136 @@
|
||||
.\" cassh - Manager for an OpenSSH Certification Authority
|
||||
.\"
|
||||
.\" Written in 2022 by Lucas
|
||||
.\"
|
||||
.\" To the extent possible under law, the author(s) have dedicated all
|
||||
.\" copyright and related and neighboring rights to this software to the
|
||||
.\" public domain worldwide. This software is distributed without any
|
||||
.\" warranty.
|
||||
.\"
|
||||
.\" You should have received a copy of the CC0 Public Domain Dedication
|
||||
.\" along with this software. If not, see
|
||||
.\" <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||
.\"
|
||||
.Dd March 01, 2022
|
||||
.Dt CASSH 1
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm cassh
|
||||
.Nd Manager for an OpenSSH Certification Authority
|
||||
.Sh SYNOPSIS
|
||||
.Nm
|
||||
.Bk -words
|
||||
.Cm issue
|
||||
.Op Fl hqv
|
||||
.Op Fl I Ar key_id
|
||||
.Op Fl n Ar principals
|
||||
.Op Fl V Ar validity_interval
|
||||
.Ek
|
||||
.Nm
|
||||
.Bk -words
|
||||
.Cm mkfile
|
||||
.Ic authorized_keys
|
||||
.Op options
|
||||
.Ek
|
||||
.Nm
|
||||
.Bk -words
|
||||
.Cm mkfile
|
||||
.Ic known_hosts
|
||||
.Op hostnames
|
||||
.Ek
|
||||
.Sh DESCRIPTION
|
||||
.Nm
|
||||
is a small utility for issuing and revoking OpenSSH Certificates.
|
||||
It relies on a simple filesystem structure and a running
|
||||
.Xr ssh-agent 1
|
||||
instance that is in charge of performing all signing operations.
|
||||
Additionally,
|
||||
.Nm
|
||||
can generate
|
||||
.Pa authorized_keys
|
||||
and
|
||||
.Pa known_hosts
|
||||
files based on the active Certification Authority.
|
||||
.Pp
|
||||
A Certification Authority directory consists of a
|
||||
.Pa ca.pub
|
||||
file corresponding to the public key of it, a
|
||||
.Pa pubkeys/
|
||||
directory which holds the public keys to be signed, and an optional
|
||||
.Pa serial.txt
|
||||
file holding the current serial number for the issued certificates.
|
||||
.Pp
|
||||
The following commands are available to
|
||||
.Xr cassh 1 :
|
||||
.Bl -tag -width Ds
|
||||
.It Xo
|
||||
.Cm issue
|
||||
.Op Fl hqv
|
||||
.Op Fl I Ar key_id
|
||||
.Op Fl n Ar principals
|
||||
.Op Fl V Ar validity_interval
|
||||
.Xc
|
||||
Issue certificates for all the public keys inside the
|
||||
.Pa pubkeys/
|
||||
directory.
|
||||
Token expansion is performed on arguments
|
||||
.Ar key_id
|
||||
and
|
||||
.Ar principals .
|
||||
The recognized tokens are:
|
||||
.Pp
|
||||
.Bl -tag -width XXXX -offset indent -compact
|
||||
.It %%
|
||||
A literal
|
||||
.Sq % .
|
||||
.It \&%C
|
||||
The Certification Authority private key comment.
|
||||
.It %f
|
||||
The basename of the public key being signed.
|
||||
.El
|
||||
.Pp
|
||||
.Ar key_id
|
||||
accepts the tokens %%, %C, and %f.
|
||||
.Pp
|
||||
.Ar principals
|
||||
accepts the tokens %% and %f.
|
||||
.Pp
|
||||
After token expansion, all recognized options are passed down to
|
||||
.Xr ssh-keygen 1
|
||||
process.
|
||||
.It Cm mkfile Ic authorized_keys Op Ar options
|
||||
Write an
|
||||
.Ic authorized_keys
|
||||
file on standard output corresponding to the current Certification
|
||||
Authority.
|
||||
.Ar options
|
||||
is copied verbatim to the output, and
|
||||
.Cm cert-authority
|
||||
is always added.
|
||||
.It Cm mkfile Ic known_hosts Op Ar hostnames
|
||||
Write a
|
||||
.Ic known_hosts
|
||||
file on standard output corresponding to the current Certification
|
||||
Authority.
|
||||
.Ar hostnames is copied verbatim to the output.
|
||||
.El
|
||||
.Sh ENVIRONMENT
|
||||
TBD
|
||||
.Sh EXIT STATUS
|
||||
.Ex -std
|
||||
.Sh EXAMPLES
|
||||
TBD
|
||||
.Sh SEE ALSO
|
||||
.Xr ssh-agent 1 ,
|
||||
.Xr ssh-keygen 1
|
||||
.Sh AUTHORS
|
||||
.An Lucas
|
||||
.Sh LICENSE
|
||||
.Nm
|
||||
is in the public domain.
|
||||
.Pp
|
||||
To the extent possible under law, the author(s) have dedicated all
|
||||
copyright and related and neighboring rights to this software to the
|
||||
public domain worldwide.
|
||||
.Pp
|
||||
.Lk http://creativecommons.org/publicdomain/zero/1.0/
|
||||
257
cassh.sh
Normal file
257
cassh.sh
Normal file
@ -0,0 +1,257 @@
|
||||
#!/bin/sh
|
||||
# cassh - Manager for an OpenSSH Certification Authority
|
||||
#
|
||||
# Written in 2022 by Lucas
|
||||
#
|
||||
# To the extent possible under law, the author(s) have dedicated all
|
||||
# copyright and related and neighboring rights to this software to the
|
||||
# public domain worldwide. This software is distributed without any
|
||||
# warranty.
|
||||
# You should have received a copy of the CC0 Public Domain Dedication
|
||||
# along with this software. If not, see
|
||||
# <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||
|
||||
usage()
|
||||
{
|
||||
cat - <<EOF >&2
|
||||
Usage:
|
||||
${0##*/} issue [-hqv] [-I key_id] [-n principals]
|
||||
[-V validity_interval]
|
||||
${0##*/} mkfile [-n principals] authorized_keys | known_hosts
|
||||
EOF
|
||||
exit 1
|
||||
}
|
||||
|
||||
err()
|
||||
{
|
||||
printf "%s: %s\n" "${0##*/}" "$*" >&2
|
||||
exit 1
|
||||
}
|
||||
|
||||
strip_leading_zeros()
|
||||
{
|
||||
_s=$1
|
||||
if [ -z "$_s" ]; then
|
||||
return
|
||||
fi
|
||||
while [ X"${_s#0}" != X"$_s" ]; do
|
||||
_s=${_s#0}
|
||||
done
|
||||
echo "${_s:-0}"
|
||||
}
|
||||
|
||||
strcmp()
|
||||
{
|
||||
_r=$(expr "X$1" "$2" "X$3")
|
||||
[ "${_r:-0}" -eq 1 ]
|
||||
}
|
||||
|
||||
# Returns comment from the ssh-agent if any is returned, otherwise it
|
||||
# returns the public key's fingerprint.
|
||||
get_ca_comment_from_sk()
|
||||
{
|
||||
ssh-keygen -lf "$1" | {
|
||||
read -r pk_sz pk_fp pk_extra
|
||||
_comment=$(ssh-add -l | while read -r sk_sz sk_fp sk_extra; do
|
||||
if [ "X$sk_fp" = "X$pk_fp" ]; then
|
||||
echo "${sk_extra% (*)}"
|
||||
break
|
||||
fi
|
||||
done)
|
||||
echo "${_comment:-${pk_fp#*:}}"
|
||||
}
|
||||
}
|
||||
|
||||
_template_fmt()
|
||||
{
|
||||
_allowed_chars=$1
|
||||
_char=$2
|
||||
if [ "X$_char" = X% ]; then
|
||||
echo %
|
||||
return $?
|
||||
fi
|
||||
|
||||
case $_char in
|
||||
[$_allowed_chars])
|
||||
;;
|
||||
*)
|
||||
return 1
|
||||
;;
|
||||
esac
|
||||
|
||||
_v=$(eval echo '${_template_fmt_'"$_char"':-}')
|
||||
if [ -z "$_v" ]; then
|
||||
return 1
|
||||
fi
|
||||
|
||||
echo "$_v"
|
||||
}
|
||||
|
||||
template()
|
||||
{
|
||||
_allowed=$1
|
||||
_s=$2
|
||||
_out=
|
||||
|
||||
while [ "${_s#*%}" != "$_s" ]; do
|
||||
_t=${_s#*%}
|
||||
_out=$_out${_s%"%"$_t}
|
||||
_s=$_t
|
||||
_c=${_s%${_s#?}}
|
||||
|
||||
_t=$(_template_fmt "$_allowed" "$_c")
|
||||
if [ $? -ne 0 ]; then
|
||||
return 1
|
||||
fi
|
||||
_out=$_out$_t
|
||||
|
||||
_s=${_s#$_c}
|
||||
done
|
||||
_out=$_out$_s
|
||||
|
||||
echo "$_out"
|
||||
}
|
||||
|
||||
main_issue()
|
||||
{
|
||||
hflag=
|
||||
key_id_fmt=%C/%f
|
||||
nflag=false
|
||||
principals_fmt=
|
||||
qflag=
|
||||
validity_interval=always:forever
|
||||
vflag=
|
||||
while getopts hI:n:qV:v flag; do
|
||||
case $flag in
|
||||
h) hflag=-h ;;
|
||||
I) key_id_fmt=$OPTARG ;;
|
||||
n) nflag=true principals_fmt=$OPTARG ;;
|
||||
q) qflag=-q ;;
|
||||
V) validity_interval=$OPTARG ;;
|
||||
v) vflag=${vflag:--}v ;;
|
||||
*) usage ;;
|
||||
esac
|
||||
done
|
||||
shift $(($OPTIND - 1))
|
||||
if [ $# -ne 0 ]; then
|
||||
usage
|
||||
fi
|
||||
|
||||
if [ ! -f ca.pub ]; then
|
||||
err "no ca.pub found"
|
||||
fi
|
||||
if ! ssh-add $qflag $vflag -T ca.pub; then
|
||||
err "can't use CA key"
|
||||
fi
|
||||
if [ ! -d pubkeys/ ]; then
|
||||
err "no pubkeys directory found"
|
||||
fi
|
||||
|
||||
if [ ! -f serial.txt ]; then
|
||||
date -u +%Y%m%d000000000 >serial.txt
|
||||
fi
|
||||
read -r serial <serial.txt
|
||||
# Remove NNNNNNNNN suffix
|
||||
serial_date=${serial%?????????}
|
||||
current_date=$(date -u +%Y%m%d)
|
||||
if strcmp "$current_date" ">" "$serial_date"; then
|
||||
serial_date=$current_date
|
||||
serial_counter=0
|
||||
else
|
||||
# Remove YYYYmmdd prefix and leading
|
||||
serial_counter=$(strip_leading_zeros "${serial#????????}")
|
||||
fi
|
||||
serial=$(printf "%s%09u\n" "$serial_date" "$serial_counter")
|
||||
|
||||
_template_fmt_C=$(get_ca_comment_from_sk ca.pub)
|
||||
find pubkeys/ -type f -name '*.pub' ! -name '*-cert.pub' | {
|
||||
rc=0
|
||||
while read -r pk; do
|
||||
pkname=${pk%.pub}
|
||||
pkname=${pkname#pubkeys/}
|
||||
_template_fmt_f=$pkname
|
||||
|
||||
id=$(template Cf "$key_id_fmt")
|
||||
set -- -I "$id" -Us ca.pub $hflag $qflag $vflag \
|
||||
-V "$validity_interval" -z "$serial"
|
||||
|
||||
if $nflag; then
|
||||
principals=$(template f "$principals_fmt")
|
||||
ssh-keygen "$@" -n "$principals" "$pk"
|
||||
else
|
||||
ssh-keygen "$@" "$pk"
|
||||
fi || rc=1
|
||||
|
||||
serial_counter=$(($serial_counter + 1))
|
||||
if [ $serial_counter -ge 1000000000 ]; then
|
||||
err "can't issue more certificates today"
|
||||
fi
|
||||
serial=$(printf "%s%09u\n" "$serial_date" \
|
||||
"$serial_counter" | tee serial.txt)
|
||||
|
||||
if [ $rc -ne 0 ]; then
|
||||
break
|
||||
fi
|
||||
done
|
||||
return $rc
|
||||
}
|
||||
}
|
||||
|
||||
main_mkfile()
|
||||
{
|
||||
while getopts : flag; do
|
||||
case $flag in
|
||||
*) usage ;;
|
||||
esac
|
||||
done
|
||||
shift $(($OPTIND - 1))
|
||||
if [ $# -lt 1 ]; then
|
||||
usage
|
||||
fi
|
||||
file=$1
|
||||
shift
|
||||
|
||||
if [ ! -f ca.pub ]; then
|
||||
err "no ca.pub found"
|
||||
fi
|
||||
|
||||
case $file in
|
||||
authorized_keys)
|
||||
if [ $# -gt 1 ]; then
|
||||
usage
|
||||
fi
|
||||
options=cert-authority${1:+,$1}
|
||||
printf "%s " "$options"
|
||||
;;
|
||||
known_hosts)
|
||||
if [ $# -gt 1 ]; then
|
||||
usage
|
||||
fi
|
||||
hostnames=${1:-}
|
||||
if [ -n "$hostnames" ]; then
|
||||
printf "@cert-authority %s " "$hostnames"
|
||||
else
|
||||
printf "@cert-authority "
|
||||
fi
|
||||
;;
|
||||
*)
|
||||
err "unknown file \"$file\""
|
||||
;;
|
||||
esac
|
||||
|
||||
cat ca.pub
|
||||
}
|
||||
|
||||
set -u
|
||||
|
||||
if [ $# -lt 1 ]; then
|
||||
usage
|
||||
fi
|
||||
cmd=$1
|
||||
shift
|
||||
|
||||
case $cmd in
|
||||
issue) main_issue "$@" ;;
|
||||
mkfile) main_mkfile "$@" ;;
|
||||
*) usage ;;
|
||||
esac
|
||||
Loading…
Reference in New Issue
Block a user