/usr/share/monkeysphere/m/subkey_to_ssh_agent is in monkeysphere 0.37-2.
This file is owned by root:root, with mode 0o644.
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 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | # -*-shell-script-*-
# This should be sourced by bash (though we welcome changes to make it POSIX sh compliant)
# Monkeysphere subkey-to-ssh-agent subcommand
#
# The monkeysphere scripts are written by:
# Jameson Rollins <jrollins@finestructure.net>
# Jamie McClelland <jm@mayfirst.org>
# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
#
# They are Copyright 2008-2009, and are all released under the GPL,
# version 3 or later.
# try to add all authentication subkeys to the agent
# FIXME: what if you only want to add one authentication subkey to the
# agent?
subkey_to_ssh_agent() {
local sshaddresponse=0
local secretkeys
local authsubkeys
local workingdir
local keysuccess=0
local subkey
local publine
local kname
# if there's no agent running, don't bother:
if [ -z "$SSH_AUTH_SOCK" ] || ! type ssh-add >/dev/null ; then
failure "No ssh-agent available."
fi
# and if it looks like it's running, but we can't actually talk to
# it, bail out:
ssh-add -l >/dev/null || sshaddresponse="$?"
if [ "$sshaddresponse" = "2" ]; then
failure "Could not connect to ssh-agent"
fi
# if the MONKEYSPHERE_SUBKEYS_FOR_AGENT variable is set, use the
# keys specified there
if [ "$MONKEYSPHERE_SUBKEYS_FOR_AGENT" ] ; then
authsubkeys="$MONKEYSPHERE_SUBKEYS_FOR_AGENT"
# otherwise find all authentication-capable subkeys and use those
else
# get list of secret keys
# (to work around bug https://bugs.g10code.com/gnupg/issue945):
secretkeys=$(gpg_user --list-secret-keys --with-colons \
--fingerprint | \
grep '^fpr:' | cut -f10 -d: | awk '{ print "0x" $1 "!" }')
if [ -z "$secretkeys" ]; then
failure "You have no secret keys in your keyring!
You might want to run 'gpg --gen-key'."
fi
authsubkeys=$(gpg_user --list-secret-keys --with-colons \
--fingerprint --fingerprint $secretkeys | \
cut -f1,5,10,12 -d: | grep -A1 '^ssb:[^:]*::[^:]*a[^:]*$' | \
grep '^fpr::' | cut -f3 -d: | sort -u)
if [ -z "$authsubkeys" ]; then
failure "no authentication-capable subkeys available.
You might want to run 'monkeysphere gen-subkey'."
fi
fi
workingdir=$(msmktempdir)
trap "rm -rf $workingdir" EXIT
umask 077
mkfifo "$workingdir/passphrase"
# FIXME: we're currently allowing any other options to get passed
# through to ssh-add. should we limit it to known ones? For
# example: -d or -c and/or -t <lifetime>
for subkey in $authsubkeys; do
# test that the subkey has proper capability
capability=$(gpg_user --list-secret-keys --with-colons \
--fingerprint --fingerprint "0x${subkey}!" \
| egrep -B 1 "^fpr:::::::::${subkey}:$" | grep "^ssb:" | cut -d: -f12)
if ! check_capability "$capability" 'a' ; then
log error "Did not find authentication-capable subkey with key ID '$subkey'."
continue
fi
# choose a label by which this key will be known in the agent:
# we are labelling the key by User ID instead of by
# fingerprint, but filtering out all / characters to make sure
# the filename is legit.
# FIXME: this assumes that the first listed uid is the primary
# UID. does gpg guarantee that? is there some better way to
# get this info?
primaryuid=$(gpg_user --with-colons --list-key "0x${subkey}!" | grep '^uid:' | head -n1 | cut -f10 -d: | tr -d /)
#kname="[monkeysphere] $primaryuid"
kname="${primaryuid:-Monkeysphere Key 0x${subkey}}"
if [ "$1" = '-d' ]; then
# we're removing the subkey:
gpg_user --export --no-armor "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname"
(cd "$workingdir" && ssh-add -d "$kname") || keysuccess="$?"
else
# we're adding the subkey:
mkfifo "$workingdir/$kname"
gpg_user --batch --passphrase-fd 3 3<"$workingdir/passphrase" \
--export-options export-reset-subkey-passwd,export-minimal,no-export-attributes \
--export-secret-subkeys --no-armor "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname" &
(cd "$workingdir" && DISPLAY=nosuchdisplay SSH_ASKPASS=/bin/false ssh-add "$@" "$kname" </dev/null )&
passphrase_prompt "Enter passphrase for key $kname: " "$workingdir/passphrase"
wait %2 || keysuccess="$?"
fi
rm -f "$workingdir/$kname"
done
trap - EXIT
rm -rf "$workingdir"
# FIXME: sort out the return values: we're just returning the
# failure code of the last authentication subkey which fails.
# what if more than one authentication subkey fails?
return "$keysuccess"
}
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