/usr/bin/ssh-copy-id is in openssh-client 1:5.9p1-5ubuntu1.10.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | #!/bin/sh
# Shell script to install your public key on a remote machine
# Takes the remote machine name as an argument.
# Obviously, the remote machine must accept password authentication,
# or one of the other keys in your ssh-agent, for this to work.
ID_FILE="${HOME}/.ssh/id_rsa.pub"
if [ "-i" = "$1" ]; then
shift
# check if we have 2 parameters left, if so the first is the new ID file
if [ -n "$2" ]; then
if expr "$1" : ".*\.pub" > /dev/null ; then
ID_FILE="$1"
else
ID_FILE="$1.pub"
fi
shift # and this should leave $1 as the target name
fi
else
if [ x$SSH_AUTH_SOCK != x ] && ssh-add -L >/dev/null 2>&1; then
GET_ID="$GET_ID ssh-add -L"
fi
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
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