mirror of git://anongit.mindrot.org/openssh.git
417 lines
14 KiB
Bash
417 lines
14 KiB
Bash
#!/bin/sh
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# Copyright (c) 1999-2024 Philip Hands <phil@hands.com>
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# 2021 Carlos Rodríguez Gili <carlos.rodriguez-gili@upc.edu>
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# 2020 Matthias Blümel <blaimi@blaimi.de>
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# 2017 Sebastien Boyron <seb@boyron.eu>
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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
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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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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# 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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# 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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# shellcheck shell=dash
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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' "$0" >&2
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exit 1
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fi
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fi
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# shellcheck disable=SC2010
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DEFAULT_PUB_ID_FILE=$(ls -dt "${HOME}"/.ssh/id*.pub 2>/dev/null | grep -v -- '-cert.pub$' | head -n 1)
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SSH="ssh -a -x"
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TARGET_PATH=".ssh/authorized_keys"
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umask 0177
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usage () {
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printf 'Usage: %s [-h|-?|-f|-n|-s|-x] [-i [identity_file]] [-t target_path] [-F ssh_config] [[-o ssh_option] ...] [-p port] [user@]hostname\n' "$0" >&2
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printf '\t-f: force mode -- copy keys without trying to check if they are already installed\n' >&2
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printf '\t-n: dry run -- no keys are actually copied\n' >&2
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printf '\t-s: use sftp -- use sftp instead of executing remote-commands. Can be useful if the remote only allows sftp\n' >&2
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printf '\t-x: debug -- enables -x in this shell, for debugging\n' >&2
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printf '\t-h|-?: print this help\n' >&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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L_ID_FILE="$1"
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if [ -z "$L_ID_FILE" ] ; then
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printf '%s: ERROR: no ID file found\n' "$0" >&2
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exit 1
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fi
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if expr "$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="$L_ID_FILE.pub"
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fi
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[ "$FORCED" ] || 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" ${PRIV_ID_FILE:+"$PRIV_ID_FILE"} ; do
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ErrMSG=$( { : < "$f" ; } 2>&1 ) || {
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L_PRIVMSG=""
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[ "$f" = "$PRIV_ID_FILE" ] && L_PRIVMSG=" (to install the contents of '$PUB_ID_FILE' anyway, look at the -f option)"
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printf "\\n%s: ERROR: failed to open ID file '%s': %s\\n" "$0" "$f" "$(printf '%s\n%s\n' "$ErrMSG" "$L_PRIVMSG" | sed -e 's/.*: *//')" >&2
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exit 1
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}
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done
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GET_ID="cat \"$PUB_ID_FILE\""
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}
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if [ -n "$SSH_AUTH_SOCK" ] && ssh-add -L >/dev/null 2>&1 ; then
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GET_ID="ssh-add -L"
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fi
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OPTS="io:p:F:t:fnsxh?"
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while getopts "$OPTS" OPT
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do
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case "$OPT" in
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i)
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[ "${SEEN_OPT_I}" ] && {
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printf '\n%s: ERROR: -i option must not be specified more than once\n\n' "$0" >&2
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usage
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}
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SEEN_OPT_I="yes"
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# Check for -i's optional parameter
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eval "nextarg=\${$OPTIND}"
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# shellcheck disable=SC2154
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if [ $OPTIND = $# ]; then
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if [ -r "$nextarg" ] && grep -iq ssh "$nextarg"; then
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printf '\n%s: ERROR: Missing hostname. Use "-i -- %s" if you really mean to use this as the hostname\n\n' "$0" "$nextarg" >&2
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usage
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fi
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elif ! expr -- "$nextarg" : "-[$(echo "$OPTS" | tr -d :)-]" >/dev/null ; then
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# when not at the last arg, and not followed by an option, -i has an argument
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OPTARG="$nextarg"
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OPTIND=$((OPTIND + 1))
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fi
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use_id_file "${OPTARG:-$DEFAULT_PUB_ID_FILE}"
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;;
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o|F)
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OPTS_oF="${OPTS_oF:+$OPTS_oF }-$OPT '$(quote "${OPTARG}")'"
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;;
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f)
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FORCED=1
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;;
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n)
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DRY_RUN=1
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;;
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p)
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SSH_PORT=${OPTARG}
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;;
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s)
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SFTP=sftp
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;;
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t)
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TARGET_PATH="${OPTARG}"
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;;
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x)
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SET_X="set -x;"
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set -x
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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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#shift all args to keep only USER_HOST
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shift $((OPTIND-1))
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if [ $# = 0 ] ; then
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usage
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fi
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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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USER_HOST="$*"
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# tack the hostname onto SSH_OPTS
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OPTS_USER_HOST="${OPTS_oF:+$OPTS_oF }'$(quote "$USER_HOST")'"
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SSH_OPTS="${SSH_PORT:+-p $SSH_PORT }$OPTS_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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# shellcheck disable=SC2086
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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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printf '%s: INFO: Source of key(s) to be installed: %s\n' "$0" "${GET_ID#cat }" >&2
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# shellcheck disable=SC2086
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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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# assert_scratch_ok()
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# ensures that $SCRATCH_DIR is setup.
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assert_scratch_ok() {
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[ "$SCRATCH_DIR" ] && [ -d "$SCRATCH_DIR" ] && [ -w "$SCRATCH_DIR" ] && return 0
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printf 'ERROR: Assertion failure: in %s(): scratch_dir was not correctly set up (SCRATCH_DIR = "%s")\n' "$1" "$SCRATCH_DIR" >&2
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return 1
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}
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# filter_ids()
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# tries to log in using the keys piped to it, and filters out any that work
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filter_ids() {
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L_SUCCESS="$1"
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assert_scratch_ok filter_ids || return
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L_TMP_ID_FILE="$SCRATCH_DIR"/popids_tmp_id
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L_OUTPUT_FILE="$SCRATCH_DIR"/popids_output
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# repopulate "$@" inside this function
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eval set -- "$SSH_OPTS"
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while read -r ID || [ "$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 ControlPath=none \
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-o LogLevel=INFO \
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-o PreferredAuthentications=publickey \
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-o IdentitiesOnly=yes "$@" exit >"$L_OUTPUT_FILE" 2>&1 </dev/null
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if [ "$?" = "$L_SUCCESS" ] || {
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[ "$SFTP" ] && grep 'allows sftp connections only' "$L_OUTPUT_FILE" >/dev/null
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# this error counts as a success if we're setting up an sftp connection
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}
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then
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: > "$L_TMP_ID_FILE"
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else
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grep 'Permission denied' "$L_OUTPUT_FILE" >/dev/null || {
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sed -e 's/^/ERROR: /' <"$L_OUTPUT_FILE" >"$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 "$L_TMP_ID_FILE"
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done
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}
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# populate_new_ids() uses several global variables ($USER_HOST, $SSH_OPTS ...)
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# and has the side effect of setting $NEW_IDS
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populate_new_ids() {
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if [ "$FORCED" ] ; then
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# shellcheck disable=SC2086
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NEW_IDS=$(eval $GET_ID)
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return
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fi
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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' "$0" >&2
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# shellcheck disable=SC2086
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NEW_IDS=$(eval $GET_ID | filter_ids $1)
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if expr "$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' "$0" >&2
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printf '\t\t(if you think this is a mistake, you may want to use -f option)\n\n' >&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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# installkey_sh [target_path]
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# produce a one-liner to add the keys to remote $TARGET_PATH
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installkeys_sh() {
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# In setting INSTALLKEYS_SH:
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# the tr puts it all on one line (to placate tcsh)
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# (hence the excessive use of semi-colons (;) )
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# then in the command:
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# cd to be at $HOME, just in case;
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# the -z `tail ...` checks for a trailing newline. The echo adds one if was missing
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# the cat adds the keys we're getting via STDIN
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# and if available restorecon is used to restore the SELinux context
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# OpenWrt has a special case for root only.
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INSTALLKEYS_SH=$(tr '\t\n' ' ' <<-EOF
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$SET_X
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cd;
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umask 077;
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AUTH_KEY_FILE="${TARGET_PATH}";
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[ -f /etc/openwrt_release ] && [ "\$LOGNAME" = "root" ] &&
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AUTH_KEY_FILE=/etc/dropbear/authorized_keys;
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AUTH_KEY_DIR=\`dirname "\${AUTH_KEY_FILE}"\`;
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mkdir -p "\${AUTH_KEY_DIR}" &&
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{ [ -z "\`tail -1c "\${AUTH_KEY_FILE}" 2>/dev/null\`" ] ||
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echo >> "\${AUTH_KEY_FILE}" || exit 1; } &&
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cat >> "\${AUTH_KEY_FILE}" || exit 1;
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if type restorecon >/dev/null 2>&1; then
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restorecon -F "\${AUTH_KEY_DIR}" "\${AUTH_KEY_FILE}";
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fi
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EOF
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)
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# to defend against quirky remote shells: use 'exec sh -c' to get POSIX;
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printf "exec sh -c '%s'" "${INSTALLKEYS_SH}"
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}
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#shellcheck disable=SC2120 # the 'eval set' confuses this
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installkeys_via_sftp() {
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AUTH_KEY_FILE=${TARGET_PATH}
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AUTH_KEY_DIR=$(dirname "${AUTH_KEY_FILE}")
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# repopulate "$@" inside this function
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eval set -- "$SSH_OPTS"
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assert_scratch_ok installkeys_via_sftp || return 1
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L_KEYS="$SCRATCH_DIR"/authorized_keys
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L_SHARED_CON="$SCRATCH_DIR"/master-conn
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$SSH -f -N -M -S "$L_SHARED_CON" "$@"
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L_CLEANUP="$SSH -S '$L_SHARED_CON' -O exit 'ignored' >/dev/null 2>&1 ; $SCRATCH_CLEANUP"
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#shellcheck disable=SC2064
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trap "$L_CLEANUP" EXIT TERM INT QUIT
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sftp -b - -o "ControlPath='$L_SHARED_CON'" "ignored" <<-EOF || return 1
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-get "$AUTH_KEY_FILE" "$L_KEYS"
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EOF
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# add a newline or create file if it's missing, same like above
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[ -z "$(tail -1c "$L_KEYS" 2>/dev/null)" ] || echo >> "$L_KEYS"
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# append the keys being piped in here
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cat >> "$L_KEYS"
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sftp -b - -o "ControlPath='$L_SHARED_CON'" "ignored" <<-EOF || return 1
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-mkdir "$AUTH_KEY_DIR"
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chmod 700 "$AUTH_KEY_DIR"
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put "$L_KEYS" "$AUTH_KEY_FILE"
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chmod 600 "$AUTH_KEY_FILE"
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EOF
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#shellcheck disable=SC2064
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eval "$L_CLEANUP" && trap "$SCRATCH_CLEANUP" EXIT TERM INT QUIT
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}
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# create a scratch dir for any temporary files needed
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if SCRATCH_DIR=$(mktemp -d ~/.ssh/ssh-copy-id.XXXXXXXXXX) &&
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[ "$SCRATCH_DIR" ] && [ -d "$SCRATCH_DIR" ]
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then
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chmod 0700 "$SCRATCH_DIR"
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SCRATCH_CLEANUP="rm -rf \"$SCRATCH_DIR\""
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#shellcheck disable=SC2064
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trap "$SCRATCH_CLEANUP" EXIT TERM INT QUIT
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else
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printf '%s: ERROR: failed to create required temporary directory under ~/.ssh (HOME="%s")\n' "$0" "$HOME" >&2
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exit 1
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fi
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REMOTE_VERSION=$($SSH -v -o PreferredAuthentications=',' -o ControlPath=none "$@" 2>&1 |
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sed -ne 's/.*remote software version //p')
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# shellcheck disable=SC2029
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case "$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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;;
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*)
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# Assuming that the remote host treats $TARGET_PATH as one might expect
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populate_new_ids 0
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if ! [ "$DRY_RUN" ] ; then
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printf '%s\n' "$NEW_IDS" | \
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if [ "$SFTP" ] ; then
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#shellcheck disable=SC2119
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installkeys_via_sftp
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else
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$SSH "$@" "$(installkeys_sh)"
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fi || exit 1
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fi
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ADDED=$(printf '%s\n' "$NEW_IDS" | wc -l)
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;;
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esac
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if [ "$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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$NEW_IDS
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=-=-=-=-=-=-=-=
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EOF
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else
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[ -z "$SFTP" ] || PORT_OPT=P
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cat <<-EOF
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Number of key(s) added: $ADDED
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Now try logging into the machine, with: "${SFTP:-ssh} ${SEEN_OPT_I:+-i${PRIV_ID_FILE:+ $PRIV_ID_FILE} }${SSH_PORT:+-${PORT_OPT:-p} $SSH_PORT }${OPTS_USER_HOST}"
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and check to make sure that only the key(s) you wanted were added.
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EOF
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fi
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# =-=-=-=
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