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- (djm) [contrib/ssh-copy-id contrib/ssh-copy-id.1] Updated to Phil
Hands' greatly revised version.
This commit is contained in:
Damien Miller
parent
63b4bcd04e
commit
83efe7c861
@ -1,3 +1,7 @@
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20120322
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- (djm) [contrib/ssh-copy-id contrib/ssh-copy-id.1] Updated to Phil
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Hands' greatly revised version.
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20120318
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- (djm) [configure.ac log.c scp.c sshconnect2.c openbsd-compat/vis.c]
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[openbsd-compat/vis.h] FreeBSD's strnvis isn't compatible with OpenBSD's
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@ -1,54 +1,293 @@
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#!/bin/sh
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# Shell script to install your public key on a remote machine
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# Takes the remote machine name as an argument.
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# Obviously, the remote machine must accept password authentication,
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# or one of the other keys in your ssh-agent, for this to work.
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# Copyright (c) 1999-2013 Philip Hands <phil@hands.com>
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# 2013 Martin Kletzander <mkletzan@redhat.com>
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# 2010 Adeodato =?iso-8859-1?Q?Sim=F3?= <asp16@alu.ua.es>
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# 2010 Eric Moret <eric.moret@gmail.com>
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# 2009 Xr <xr@i-jeuxvideo.com>
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# 2007 Justin Pryzby <justinpryzby@users.sourceforge.net>
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# 2004 Reini Urban <rurban@x-ray.at>
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# 2003 Colin Watson <cjwatson@debian.org>
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# All rights reserved.
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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
|
||||
# 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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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||||
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
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# NOT 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 OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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ID_FILE="${HOME}/.ssh/id_rsa.pub"
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# Shell script to install your public key(s) on a remote machine
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# See the ssh-copy-id(1) man page for details
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if [ "-i" = "$1" ]; then
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shift
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# check if we have 2 parameters left, if so the first is the new ID file
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if [ -n "$2" ]; then
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if expr "$1" : ".*\.pub" > /dev/null ; then
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ID_FILE="$1"
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else
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ID_FILE="$1.pub"
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# check that we have something mildly sane as our shell, or try to find something better
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if false ^ printf "%s: WARNING: ancient shell, hunting for a more modern one... " "$0"
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then
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SANE_SH=${SANE_SH:-/usr/bin/ksh}
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if printf 'true ^ false\n' | "$SANE_SH"
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then
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printf "'%s' seems viable.\n" "$SANE_SH"
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exec "$SANE_SH" "$0" "$@"
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else
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cat <<-EOF
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oh dear.
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If you have a more recent shell available, that supports \$(...) etc.
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please try setting the environment variable SANE_SH to the path of that
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shell, and then retry running this script. If that works, please report
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a bug describing your setup, and the shell you used to make it work.
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EOF
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printf "%s: ERROR: Less dimwitted shell required.\n" "$0"
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exit 1
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fi
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fi
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DEFAULT_PUB_ID_FILE=$(ls -t ${HOME}/.ssh/id*.pub 2>/dev/null | grep -v -- '-cert.pub$' | head -n 1)
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usage () {
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printf 'Usage: %s [-h|-?|-n] [-i [identity_file]] [-p port] [[-o <ssh -o options>] ...] [user@]hostname\n' "$0" >&2
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exit 1
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}
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# escape any single quotes in an argument
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quote() {
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printf "%s\n" "$1" | sed -e "s/'/'\\\\''/g"
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}
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use_id_file() {
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local L_ID_FILE="$1"
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if expr "$L_ID_FILE" : ".*\.pub$" >/dev/null ; then
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PUB_ID_FILE="$L_ID_FILE"
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else
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PUB_ID_FILE="$L_ID_FILE.pub"
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fi
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PRIV_ID_FILE=$(dirname "$PUB_ID_FILE")/$(basename "$PUB_ID_FILE" .pub)
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# check that the files are readable
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for f in $PUB_ID_FILE $PRIV_ID_FILE ; do
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ErrMSG=$( { : < $f ; } 2>&1 ) || {
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printf "\n%s: ERROR: failed to open ID file '%s': %s\n\n" "$0" "$f" "$(printf "%s\n" "$ErrMSG" | sed -e 's/.*: *//')"
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exit 1
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}
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done
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GET_ID="cat \"$PUB_ID_FILE\""
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}
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if [ -n "$SSH_AUTH_SOCK" ] && ssh-add -L >/dev/null 2>&1 ; then
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GET_ID="ssh-add -L"
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fi
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while test "$#" -gt 0
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do
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[ "${SEEN_OPT_I}" ] && expr "$1" : "[-]i" >/dev/null && {
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printf "\n%s: ERROR: -i option must not be specified more than once\n\n" "$0"
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usage
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}
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OPT= OPTARG=
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# implement something like getopt to avoid Solaris pain
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case "$1" in
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-i?*|-o?*|-p?*)
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OPT="$(printf -- "$1"|cut -c1-2)"
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OPTARG="$(printf -- "$1"|cut -c3-)"
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shift
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;;
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-o|-p)
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OPT="$1"
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OPTARG="$2"
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shift 2
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;;
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-i)
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OPT="$1"
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test "$#" -le 2 || expr "$2" : "[-]" >/dev/null || {
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OPTARG="$2"
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shift
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}
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shift
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;;
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-n|-h|-\?)
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OPT="$1"
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OPTARG=
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shift
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;;
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--)
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shift
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while test "$#" -gt 0
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do
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SAVEARGS="${SAVEARGS:+$SAVEARGS }'$(quote "$1")'"
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shift
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done
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break
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;;
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-*)
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printf "\n%s: ERROR: invalid option (%s)\n\n" "$0" "$1"
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usage
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;;
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*)
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SAVEARGS="${SAVEARGS:+$SAVEARGS }'$(quote "$1")'"
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shift
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continue
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;;
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esac
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case "$OPT" in
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-i)
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SEEN_OPT_I="yes"
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use_id_file "${OPTARG:-$DEFAULT_PUB_ID_FILE}"
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;;
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-o|-p)
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SSH_OPTS="${SSH_OPTS:+$SSH_OPTS }$OPT '$(quote "$OPTARG")'"
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;;
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-n)
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DRY_RUN=1
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;;
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-h|-\?)
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usage
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;;
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esac
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done
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eval set -- "$SAVEARGS"
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if [ $# != 1 ] ; then
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printf '%s: ERROR: Too many arguments. Expecting a target hostname, got: %s\n\n' "$0" "$SAVEARGS" >&2
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usage
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fi
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# drop trailing colon
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USER_HOST=$(printf "%s\n" "$1" | sed 's/:$//')
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# tack the hostname onto SSH_OPTS
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SSH_OPTS="${SSH_OPTS:+$SSH_OPTS }'$(quote "$USER_HOST")'"
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# and populate "$@" for later use (only way to get proper quoting of options)
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eval set -- "$SSH_OPTS"
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if [ -z "$(eval $GET_ID)" ] && [ -r "${PUB_ID_FILE:=$DEFAULT_PUB_ID_FILE}" ] ; then
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use_id_file "$PUB_ID_FILE"
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fi
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if [ -z "$(eval $GET_ID)" ] ; then
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printf '%s: ERROR: No identities found\n' "$0" >&2
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exit 1
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fi
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# populate_new_ids() uses several global variables ($USER_HOST, $SSH_OPTS ...)
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# and has the side effect of setting $NEW_IDS
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populate_new_ids() {
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local L_SUCCESS="$1"
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# repopulate "$@" inside this function
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eval set -- "$SSH_OPTS"
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umask 0177
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local L_TMP_ID_FILE=$(mktemp ~/.ssh/ssh-copy-id_id.XXXXXXXXXX)
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trap "rm -f $L_TMP_ID_FILE*" EXIT TERM INT QUIT
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printf '%s: INFO: attempting to log in with the new key(s), to filter out any that are already installed\n' "$0" >&2
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NEW_IDS=$(
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eval $GET_ID | {
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while read ID ; do
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printf '%s\n' "$ID" > $L_TMP_ID_FILE
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# the next line assumes $PRIV_ID_FILE only set if using a single id file - this
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# assumption will break if we implement the possibility of multiple -i options.
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# The point being that if file based, ssh needs the private key, which it cannot
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# find if only given the contents of the .pub file in an unrelated tmpfile
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ssh -i "${PRIV_ID_FILE:-$L_TMP_ID_FILE}" \
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-o PreferredAuthentications=publickey \
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-o IdentitiesOnly=yes "$@" exit 2>$L_TMP_ID_FILE.stderr </dev/null
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if [ "$?" = "$L_SUCCESS" ] ; then
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: > $L_TMP_ID_FILE
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else
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grep 'Permission denied' $L_TMP_ID_FILE.stderr >/dev/null || {
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sed -e 's/^/ERROR: /' <$L_TMP_ID_FILE.stderr >$L_TMP_ID_FILE
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cat >/dev/null #consume the other keys, causing loop to end
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}
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fi
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cat $L_TMP_ID_FILE
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done
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}
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)
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rm -f $L_TMP_ID_FILE* && trap - EXIT TERM INT QUIT
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if expr "$NEW_IDS" : "^ERROR: " >/dev/null ; then
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printf '\n%s: %s\n\n' "$0" "$NEW_IDS" >&2
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exit 1
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fi
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if [ -z "$NEW_IDS" ] ; then
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printf '\n%s: WARNING: All keys were skipped because they already exist on the remote system.\n\n' "$0" >&2
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exit 0
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fi
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printf '%s: INFO: %d key(s) remain to be installed -- if you are prompted now it is to install the new keys\n' "$0" "$(printf '%s\n' "$NEW_IDS" | wc -l)" >&2
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}
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REMOTE_VERSION=$(ssh -v -o PreferredAuthentications=',' "$@" 2>&1 |
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sed -ne 's/.*remote software version //p')
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case "$REMOTE_VERSION" in
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NetScreen*)
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populate_new_ids 1
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for KEY in $(printf "%s" "$NEW_IDS" | cut -d' ' -f2) ; do
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KEY_NO=$(($KEY_NO + 1))
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printf "%s\n" "$KEY" | grep ssh-dss >/dev/null || {
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printf '%s: WARNING: Non-dsa key (#%d) skipped (NetScreen only supports DSA keys)\n' "$0" "$KEY_NO" >&2
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continue
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}
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[ "$DRY_RUN" ] || printf 'set ssh pka-dsa key %s\nsave\nexit\n' "$KEY" | ssh -T "$@" >/dev/null 2>&1
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if [ $? = 255 ] ; then
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printf '%s: ERROR: installation of key #%d failed (please report a bug describing what caused this, so that we can make this message useful)\n' "$0" "$KEY_NO" >&2
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else
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ADDED=$(($ADDED + 1))
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fi
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done
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if [ -z "$ADDED" ] ; then
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exit 1
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||||
fi
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shift # and this should leave $1 as the target name
|
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fi
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;;
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*)
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# Assuming that the remote host treats ~/.ssh/authorized_keys as one might expect
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populate_new_ids 0
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[ "$DRY_RUN" ] || printf '%s\n' "$NEW_IDS" | ssh "$@" "
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umask 077 ;
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mkdir -p .ssh && cat >> .ssh/authorized_keys || exit 1 ;
|
||||
if type restorecon >/dev/null 2>&1 ; then restorecon -F .ssh .ssh/authorized_keys ; fi" \
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|| exit 1
|
||||
ADDED=$(printf '%s\n' "$NEW_IDS" | wc -l)
|
||||
;;
|
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esac
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if [ "$DRY_RUN" ] ; then
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cat <<-EOF
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=-=-=-=-=-=-=-=
|
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Would have added the following key(s):
|
||||
|
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$NEW_IDS
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=-=-=-=-=-=-=-=
|
||||
EOF
|
||||
else
|
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if [ x$SSH_AUTH_SOCK != x ] && ssh-add -L >/dev/null 2>&1; then
|
||||
GET_ID="$GET_ID ssh-add -L"
|
||||
fi
|
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cat <<-EOF
|
||||
|
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Number of key(s) added: $ADDED
|
||||
|
||||
Now try logging into the machine, with: "ssh $SSH_OPTS"
|
||||
and check to make sure that only the key(s) you wanted were added.
|
||||
|
||||
EOF
|
||||
fi
|
||||
|
||||
if [ -z "`eval $GET_ID`" ] && [ -r "${ID_FILE}" ] ; then
|
||||
GET_ID="cat \"${ID_FILE}\""
|
||||
fi
|
||||
|
||||
if [ -z "`eval $GET_ID`" ]; then
|
||||
echo "$0: ERROR: No identities found" >&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ "$#" -lt 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
|
||||
echo "Usage: $0 [-i [identity_file]] [user@]machine" >&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
# strip any trailing colon
|
||||
host=`echo $1 | sed 's/:$//'`
|
||||
|
||||
{ eval "$GET_ID" ; } | ssh $host "umask 077; test -d ~/.ssh || mkdir ~/.ssh ; cat >> ~/.ssh/authorized_keys" || exit 1
|
||||
|
||||
cat <<EOF
|
||||
Now try logging into the machine, with "ssh '$host'", and check in:
|
||||
|
||||
~/.ssh/authorized_keys
|
||||
|
||||
to make sure we haven't added extra keys that you weren't expecting.
|
||||
|
||||
EOF
|
||||
|
||||
# =-=-=-=
|
||||
|
||||
@ -1,75 +1,186 @@
|
||||
.ig \" -*- nroff -*-
|
||||
Copyright (c) 1999 Philip Hands Computing <http://www.hands.com/>
|
||||
Copyright (c) 1999-2013 hands.com Ltd. <http://hands.com/>
|
||||
|
||||
Permission is granted to make and distribute verbatim copies of
|
||||
this manual provided the copyright notice and this permission notice
|
||||
are preserved on all copies.
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions
|
||||
are met:
|
||||
1. Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
2. Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
||||
documentation and/or other materials provided with the distribution.
|
||||
|
||||
Permission is granted to copy and distribute modified versions of this
|
||||
manual under the conditions for verbatim copying, provided that the
|
||||
entire resulting derived work is distributed under the terms of a
|
||||
permission notice identical to this one.
|
||||
|
||||
Permission is granted to copy and distribute translations of this
|
||||
manual into another language, under the above conditions for modified
|
||||
versions, except that this permission notice may be included in
|
||||
translations approved by the Free Software Foundation instead of in
|
||||
the original English.
|
||||
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||||
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
..
|
||||
.TH SSH-COPY-ID 1 "14 November 1999" "OpenSSH"
|
||||
.SH NAME
|
||||
ssh-copy-id \- install your public key in a remote machine's authorized_keys
|
||||
.SH SYNOPSIS
|
||||
.B ssh-copy-id [-i [identity_file]]
|
||||
.I "[user@]machine"
|
||||
.Dd $Mdocdate: June 17 2010 $
|
||||
.Dt SSH-COPY-ID 1
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm ssh-copy-id
|
||||
.Nd use locally available keys to authorise logins on a remote machine
|
||||
.Sh SYNOPSIS
|
||||
.Nm
|
||||
.Op Fl n
|
||||
.Op Fl i Op Ar identity_file
|
||||
.Op Fl p Ar port
|
||||
.Op Fl o Ar ssh_option
|
||||
.Op Ar user Ns @ Ns
|
||||
.Ar hostname
|
||||
.Nm
|
||||
.Fl h | Fl ?
|
||||
.br
|
||||
.SH DESCRIPTION
|
||||
.BR ssh-copy-id
|
||||
is a script that uses ssh to log into a remote machine and
|
||||
append the indicated identity file to that machine's
|
||||
.B ~/.ssh/authorized_keys
|
||||
file.
|
||||
.PP
|
||||
If the
|
||||
.B -i
|
||||
option is given then the identity file (defaults to
|
||||
.BR ~/.ssh/id_rsa.pub )
|
||||
is used, regardless of whether there are any keys in your
|
||||
.BR ssh-agent .
|
||||
Otherwise, if this:
|
||||
.PP
|
||||
.B " ssh-add -L"
|
||||
.PP
|
||||
provides any output, it uses that in preference to the identity file.
|
||||
.PP
|
||||
If the
|
||||
.B -i
|
||||
option is used, or the
|
||||
.B ssh-add
|
||||
produced no output, then it uses the contents of the identity
|
||||
file. Once it has one or more fingerprints (by whatever means) it
|
||||
uses ssh to append them to
|
||||
.B ~/.ssh/authorized_keys
|
||||
on the remote machine (creating the file, and directory, if necessary.)
|
||||
|
||||
.SH NOTES
|
||||
This program does not modify the permissions of any
|
||||
pre-existing files or directories. Therefore, if the remote
|
||||
.B sshd
|
||||
has
|
||||
.B StrictModes
|
||||
set in its
|
||||
configuration, then the user's home,
|
||||
.B ~/.ssh
|
||||
folder, and
|
||||
.B ~/.ssh/authorized_keys
|
||||
file may need to have group writability disabled manually, e.g. via
|
||||
|
||||
.B " chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys"
|
||||
|
||||
on the remote machine.
|
||||
|
||||
.SH "SEE ALSO"
|
||||
.BR ssh (1),
|
||||
.BR ssh-agent (1),
|
||||
.BR sshd (8)
|
||||
.Sh DESCRIPTION
|
||||
.Nm
|
||||
is a script that uses
|
||||
.Xr ssh 1
|
||||
to log into a remote machine (presumably using a login password,
|
||||
so password authentication should be enabled, unless you've done some
|
||||
clever use of multiple identities). It assembles a list of one or more
|
||||
fingerprints (as described below) and tries to log in with each key, to
|
||||
see if any of them are already installed (of course, if you are not using
|
||||
.Xr ssh-agent 1
|
||||
this may result in you being repeatedly prompted for pass-phrases).
|
||||
It then assembles a list of those that failed to log in, and using ssh,
|
||||
enables logins with those keys on the remote server. By default it adds
|
||||
the keys by appending them to the remote user's
|
||||
.Pa ~/.ssh/authorized_keys
|
||||
(creating the file, and directory, if necessary). It is also capable
|
||||
of detecting if the remote system is a NetScreen, and using its
|
||||
.Ql set ssh pka-dsa key ...
|
||||
command instead.
|
||||
.Pp
|
||||
The options are as follows:
|
||||
.Bl -tag -width Ds
|
||||
.It Fl i Ar identity_file
|
||||
Use only the key(s) contained in
|
||||
.Ar identity_file
|
||||
(rather than looking for identities via
|
||||
.Xr ssh-add 1
|
||||
or in the
|
||||
.Ic default_ID_file ) .
|
||||
If the filename does not end in
|
||||
.Pa .pub
|
||||
this is added. If the filename is omitted, the
|
||||
.Ic default_ID_file
|
||||
is used.
|
||||
.Pp
|
||||
Note that this can be used to ensure that the keys copied have the
|
||||
comment one prefers and/or extra options applied, by ensuring that the
|
||||
key file has these set as preferred before the copy is attempted.
|
||||
.It Fl n
|
||||
do a dry-run. Instead of installing keys on the remote system simply
|
||||
prints the key(s) that would have been installed.
|
||||
.It Fl h , Fl ?
|
||||
Print Usage summary
|
||||
.It Fl p Ar port , Fl o Ar ssh_option
|
||||
These two options are simply passed through untouched, along with their
|
||||
argument, to allow one to set the port or other
|
||||
.Xr ssh 1
|
||||
options, respectively.
|
||||
.Pp
|
||||
Rather than specifying these as command line options, it is often better to use (per-host) settings in
|
||||
.Xr ssh 1 Ns 's
|
||||
configuration file:
|
||||
.Xr ssh_config 5 .
|
||||
.El
|
||||
.Pp
|
||||
Default behaviour without
|
||||
.Fl i ,
|
||||
is to check if
|
||||
.Ql ssh-add -L
|
||||
provides any output, and if so those keys are used. Note that this results in
|
||||
the comment on the key being the filename that was given to
|
||||
.Xr ssh-add 1
|
||||
when the key was loaded into your
|
||||
.Xr ssh-agent 1
|
||||
rather than the comment contained in that file, which is a bit of a shame.
|
||||
Otherwise, if
|
||||
.Xr ssh-add 1
|
||||
provides no keys contents of the
|
||||
.Ic default_ID_file
|
||||
will be used.
|
||||
.Pp
|
||||
The
|
||||
.Ic default_ID_file
|
||||
is the most recent file that matches:
|
||||
.Pa ~/.ssh/id*.pub ,
|
||||
(excluding those that match
|
||||
.Pa ~/.ssh/*-cert.pub )
|
||||
so if you create a key that is not the one you want
|
||||
.Nm
|
||||
to use, just use
|
||||
.Xr touch 1
|
||||
on your preferred key's
|
||||
.Pa .pub
|
||||
file to reinstate it as the most recent.
|
||||
.Pp
|
||||
.Sh EXAMPLES
|
||||
If you have already installed keys from one system on a lot of remote
|
||||
hosts, and you then create a new key, on a new client machine, say,
|
||||
it can be difficult to keep track of which systems on which you've
|
||||
installed the new key. One way of dealing with this is to load both
|
||||
the new key and old key(s) into your
|
||||
.Xr ssh-agent 1 .
|
||||
Load the new key first, without the
|
||||
.Fl c
|
||||
option, then load one or more old keys into the agent, possibly by
|
||||
ssh-ing to the client machine that has that old key, using the
|
||||
.Fl A
|
||||
option to allow agent forwarding:
|
||||
.Pp
|
||||
.D1 user@newclient$ ssh-add
|
||||
.D1 user@newclient$ ssh -A old.client
|
||||
.D1 user@oldl$ ssh-add -c
|
||||
.D1 No ... prompt for pass-phrase ...
|
||||
.D1 user@old$ logoff
|
||||
.D1 user@newclient$ ssh someserver
|
||||
.Pp
|
||||
now, if the new key is installed on the server, you'll be allowed in
|
||||
unprompted, whereas if you only have the old key(s) enabled, you'll be
|
||||
asked for confirmation, which is your cue to log back out and run
|
||||
.Pp
|
||||
.D1 user@newclient$ ssh-copy-id -i someserver
|
||||
.Pp
|
||||
The reason you might want to specify the -i option in this case is to
|
||||
ensure that the comment on the installed key is the one from the
|
||||
.Pa .pub
|
||||
file, rather than just the filename that was loaded into you agent.
|
||||
It also ensures that only the id you intended is installed, rather than
|
||||
all the keys that you have in your
|
||||
.Xr ssh-agent 1 .
|
||||
Of course, you can specify another id, or use the contents of the
|
||||
.Xr ssh-agent 1
|
||||
as you prefer.
|
||||
.Pp
|
||||
Having mentioned
|
||||
.Xr ssh-add 1 Ns 's
|
||||
.Fl c
|
||||
option, you might consider using this whenever using agent forwarding
|
||||
to avoid your key being hijacked, but it is much better to instead use
|
||||
.Xr ssh 1 Ns 's
|
||||
.Ar ProxyCommand
|
||||
and
|
||||
.Fl W
|
||||
option,
|
||||
to bounce through remote servers while always doing direct end-to-end
|
||||
authentication. This way the middle hop(s) don't get access to your
|
||||
.Xr ssh-agent 1 .
|
||||
A web search for
|
||||
.Ql ssh proxycommand nc
|
||||
should prove enlightening (N.B. the modern approach is to use the
|
||||
.Fl W
|
||||
option, rather than
|
||||
.Xr nc 1 ) .
|
||||
.Sh "SEE ALSO"
|
||||
.Xr ssh 1 ,
|
||||
.Xr ssh-agent 1 ,
|
||||
.Xr sshd 8
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user