ZerethShell
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ssh-copy-id
#!/bin/sh # Copyright (c) 1999-2016 Philip Hands <phil@hands.com> # 2013 Martin Kletzander <mkletzan@redhat.com> # 2010 Adeodato =?iso-8859-1?Q?Sim=F3?= <asp16@alu.ua.es> # 2010 Eric Moret <eric.moret@gmail.com> # 2009 Xr <xr@i-jeuxvideo.com> # 2007 Justin Pryzby <justinpryzby@users.sourceforge.net> # 2004 Reini Urban <rurban@x-ray.at> # 2003 Colin Watson <cjwatson@debian.org> # All rights reserved. # # 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. # # 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. # Shell script to install your public key(s) on a remote machine # See the ssh-copy-id(1) man page for details # check that we have something mildly sane as our shell, or try to find something better if false ^ printf "%s: WARNING: ancient shell, hunting for a more modern one... " "$0" then SANE_SH=${SANE_SH:-/usr/bin/ksh} if printf 'true ^ false\n' | "$SANE_SH" then printf "'%s' seems viable.\n" "$SANE_SH" exec "$SANE_SH" "$0" "$@" else cat <<-EOF oh dear. If you have a more recent shell available, that supports \$(...) etc. please try setting the environment variable SANE_SH to the path of that shell, and then retry running this script. If that works, please report a bug describing your setup, and the shell you used to make it work. EOF printf "%s: ERROR: Less dimwitted shell required.\n" "$0" exit 1 fi fi most_recent_id="$(cd "$HOME" ; ls -t .ssh/id*.pub 2>/dev/null | grep -v -- '-cert.pub$' | head -n 1)" DEFAULT_PUB_ID_FILE="${most_recent_id:+$HOME/}$most_recent_id" usage () { printf 'Usage: %s [-h|-?|-f|-n] [-i [identity_file]] [-p port] [[-o <ssh -o options>] ...] [user@]hostname\n' "$0" >&2 printf '\t-f: force mode -- copy keys without trying to check if they are already installed\n' >&2 printf '\t-n: dry run -- no keys are actually copied\n' >&2 printf '\t-h|-?: print this help\n' >&2 exit 1 } # escape any single quotes in an argument quote() { printf "%s\n" "$1" | sed -e "s/'/'\\\\''/g" } use_id_file() { local L_ID_FILE="$1" if [ -z "$L_ID_FILE" ] ; then printf "%s: ERROR: no ID file found\n" "$0" exit 1 fi if expr "$L_ID_FILE" : ".*\.pub$" >/dev/null ; then PUB_ID_FILE="$L_ID_FILE" else PUB_ID_FILE="$L_ID_FILE.pub" fi [ "$FORCED" ] || PRIV_ID_FILE=$(dirname "$PUB_ID_FILE")/$(basename "$PUB_ID_FILE" .pub) # check that the files are readable for f in "$PUB_ID_FILE" ${PRIV_ID_FILE:+"$PRIV_ID_FILE"} ; do ErrMSG=$( { : < "$f" ; } 2>&1 ) || { local L_PRIVMSG="" [ "$f" = "$PRIV_ID_FILE" ] && L_PRIVMSG=" (to install the contents of '$PUB_ID_FILE' anyway, look at the -f option)" 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/.*: *//')" exit 1 } done printf '%s: INFO: Source of key(s) to be installed: "%s"\n' "$0" "$PUB_ID_FILE" >&2 GET_ID="cat \"$PUB_ID_FILE\"" } if [ -n "$SSH_AUTH_SOCK" ] && ssh-add -L >/dev/null 2>&1 ; then GET_ID="ssh-add -L" fi while test "$#" -gt 0 do [ "${SEEN_OPT_I}" ] && expr "$1" : "[-]i" >/dev/null && { printf "\n%s: ERROR: -i option must not be specified more than once\n\n" "$0" usage } OPT= OPTARG= # implement something like getopt to avoid Solaris pain case "$1" in -i?*|-o?*|-p?*) OPT="$(printf -- "$1"|cut -c1-2)" OPTARG="$(printf -- "$1"|cut -c3-)" shift ;; -o|-p) OPT="$1" OPTARG="$2" shift 2 ;; -i) OPT="$1" test "$#" -le 2 || expr "$2" : "[-]" >/dev/null || { OPTARG="$2" shift } shift ;; -f|-n|-h|-\?) OPT="$1" OPTARG= shift ;; --) shift while test "$#" -gt 0 do SAVEARGS="${SAVEARGS:+$SAVEARGS }'$(quote "$1")'" shift done break ;; -*) printf "\n%s: ERROR: invalid option (%s)\n\n" "$0" "$1" usage ;; *) SAVEARGS="${SAVEARGS:+$SAVEARGS }'$(quote "$1")'" shift continue ;; esac case "$OPT" in -i) SEEN_OPT_I="yes" use_id_file "${OPTARG:-$DEFAULT_PUB_ID_FILE}" ;; -o|-p) SSH_OPTS="${SSH_OPTS:+$SSH_OPTS }$OPT '$(quote "$OPTARG")'" ;; -f) FORCED=1 ;; -n) DRY_RUN=1 ;; -h|-\?) usage ;; esac done eval set -- "$SAVEARGS" if [ $# = 0 ] ; then usage fi if [ $# != 1 ] ; then printf '%s: ERROR: Too many arguments. Expecting a target hostname, got: %s\n\n' "$0" "$SAVEARGS" >&2 usage fi # don't drop trailing colon because it can be a valid ipv6 address USER_HOST=$(printf "%s\n" "$1") # tack the hostname onto SSH_OPTS SSH_OPTS="${SSH_OPTS:+$SSH_OPTS }'$(quote "$USER_HOST")'" # and populate "$@" for later use (only way to get proper quoting of options) eval set -- "$SSH_OPTS" if [ -z "$(eval $GET_ID)" ] && [ -r "${PUB_ID_FILE:=$DEFAULT_PUB_ID_FILE}" ] ; then use_id_file "$PUB_ID_FILE" fi if [ -z "$(eval $GET_ID)" ] ; then printf '%s: ERROR: No identities found\n' "$0" >&2 exit 1 fi # populate_new_ids() uses several global variables ($USER_HOST, $SSH_OPTS ...) # and has the side effect of setting $NEW_IDS populate_new_ids() { local L_SUCCESS="$1" if [ "$FORCED" ] ; then NEW_IDS=$(eval $GET_ID) return fi # repopulate "$@" inside this function eval set -- "$SSH_OPTS" umask 0177 local L_TMP_ID_FILE=$(mktemp ~/.ssh/ssh-copy-id_id.XXXXXXXXXX) if test $? -ne 0 || test "x$L_TMP_ID_FILE" = "x" ; then printf '%s: ERROR: mktemp failed\n' "$0" >&2 exit 1 fi local L_CLEANUP="rm -f \"$L_TMP_ID_FILE\" \"${L_TMP_ID_FILE}.stderr\"" trap "$L_CLEANUP" EXIT TERM INT QUIT printf '%s: INFO: attempting to log in with the new key(s), to filter out any that are already installed\n' "$0" >&2 NEW_IDS=$( eval $GET_ID | { while read ID || [ "$ID" ] ; do printf '%s\n' "$ID" > "$L_TMP_ID_FILE" # the next line assumes $PRIV_ID_FILE only set if using a single id file - this # assumption will break if we implement the possibility of multiple -i options. # The point being that if file based, ssh needs the private key, which it cannot # find if only given the contents of the .pub file in an unrelated tmpfile ssh -i "${PRIV_ID_FILE:-$L_TMP_ID_FILE}" \ -o ControlPath=none \ -o LogLevel=INFO \ -o PreferredAuthentications=publickey \ -o IdentitiesOnly=yes "$@" exit 2>"$L_TMP_ID_FILE.stderr" </dev/null if [ "$?" = "$L_SUCCESS" ] ; then : > "$L_TMP_ID_FILE" else grep 'Permission denied' "$L_TMP_ID_FILE.stderr" >/dev/null || { sed -e 's/^/ERROR: /' <"$L_TMP_ID_FILE.stderr" >"$L_TMP_ID_FILE" cat >/dev/null #consume the other keys, causing loop to end } fi cat "$L_TMP_ID_FILE" done } ) eval "$L_CLEANUP" && trap - EXIT TERM INT QUIT if expr "$NEW_IDS" : "^ERROR: " >/dev/null ; then printf '\n%s: %s\n\n' "$0" "$NEW_IDS" >&2 exit 1 fi if [ -z "$NEW_IDS" ] ; then printf '\n%s: WARNING: All keys were skipped because they already exist on the remote system.\n' "$0" >&2 printf '\t\t(if you think this is a mistake, you may want to use -f option)\n\n' >&2 exit 0 fi 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' "$NEW_IDS" | wc -l)" >&2 } REMOTE_VERSION=$(ssh -v -o PreferredAuthentications=',' -o ControlPath=none "$@" 2>&1 | sed -ne 's/.*remote software version //p') case "$REMOTE_VERSION" in NetScreen*) populate_new_ids 1 for KEY in $(printf "%s" "$NEW_IDS" | cut -d' ' -f2) ; do KEY_NO=$(($KEY_NO + 1)) printf "%s\n" "$KEY" | grep ssh-dss >/dev/null || { printf '%s: WARNING: Non-dsa key (#%d) skipped (NetScreen only supports DSA keys)\n' "$0" "$KEY_NO" >&2 continue } [ "$DRY_RUN" ] || printf 'set ssh pka-dsa key %s\nsave\nexit\n' "$KEY" | ssh -T "$@" >/dev/null 2>&1 if [ $? = 255 ] ; then 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 else ADDED=$(($ADDED + 1)) fi done if [ -z "$ADDED" ] ; then exit 1 fi ;; *) # Assuming that the remote host treats ~/.ssh/authorized_keys as one might expect populate_new_ids 0 # in ssh below - to defend against quirky remote shells: use 'exec sh -c' to get POSIX; # 'cd' to be at $HOME; add a newline if it's missing; and all on one line, because tcsh. [ "$DRY_RUN" ] || printf '%s\n' "$NEW_IDS" | \ ssh "$@" "exec sh -c 'cd ; umask 077 ; mkdir -p .ssh && { [ -z "'`tail -1c .ssh/authorized_keys 2>/dev/null`'" ] || echo >> .ssh/authorized_keys || exit 1; } && cat >> .ssh/authorized_keys || exit 1 ; if type restorecon >/dev/null 2>&1 ; then restorecon -F .ssh .ssh/authorized_keys ; fi'" \ || exit 1 ADDED=$(printf '%s\n' "$NEW_IDS" | wc -l) ;; esac if [ "$DRY_RUN" ] ; then cat <<-EOF =-=-=-=-=-=-=-= Would have added the following key(s): $NEW_IDS =-=-=-=-=-=-=-= EOF else cat <<-EOF 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 # =-=-=-=
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