diff options
Diffstat (limited to 'src/share/m/subkey_to_ssh_agent')
| -rw-r--r-- | src/share/m/subkey_to_ssh_agent | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/share/m/subkey_to_ssh_agent b/src/share/m/subkey_to_ssh_agent new file mode 100644 index 0000000..012c95f --- /dev/null +++ b/src/share/m/subkey_to_ssh_agent @@ -0,0 +1,113 @@ +# -*-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 + +subkey_to_ssh_agent() { + local sshaddresponse + local secretkeys + local authsubkeys + local workingdir + local keysuccess + local subkey + local publine + local kname + + if ! test_gnu_dummy_s2k_extension ; then + failure "Your version of GnuTLS does not seem capable of using with gpg's exported subkeys. +You may want to consider patching or upgrading to GnuTLS 2.6 or later. + +For more details, see: + http://lists.gnu.org/archive/html/gnutls-devel/2008-08/msg00005.html" + fi + + # if there's no agent running, don't bother: + if [ -z "$SSH_AUTH_SOCK" ] || ! which ssh-add >/dev/null ; then + failure "No ssh-agent available." + fi + + # and if it looks like it's running, but we can't actually talk to + # it, bail out: + ssh-add -l >/dev/null + sshaddresponse="$?" + if [ "$sshaddresponse" = "2" ]; then + failure "Could not connect to ssh-agent" + fi + + # get list of secret keys (to work around bug + # https://bugs.g10code.com/gnupg/issue945): + secretkeys=$(gpg --list-secret-keys --with-colons --fixed-list-mode --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 --list-secret-keys --with-colons --fixed-list-mode \ + --fingerprint --fingerprint $secretkeys | \ + cut -f1,5,10,12 -d: | grep -A1 '^ssb:[^:]*::[^:]*a[^:]*$' | \ + grep '^fpr::' | cut -f3 -d: | sort -u) + + if [ -z "$authsubkeys" ]; then + failure "no authentication-capable subkeys available. +You might want to 'monkeysphere gen-subkey'" + fi + + workingdir=$(mktemp -d ${TMPDIR:-/tmp}/tmp.XXXXXXXXXX) + umask 077 + mkfifo "$workingdir/passphrase" + keysuccess=1 + + # 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 $authsubkeys; do + # choose a label by which this key will be known in the agent: + # we are labelling the key by User ID instead of by + # fingerprint, but filtering out all / characters to make sure + # the filename is legit. + + primaryuid=$(gpg --with-colons --list-key "0x${subkey}!" | grep '^pub:' | cut -f10 -d: | tr -d /) + + #kname="[monkeysphere] $primaryuid" + kname="$primaryuid" + + if [ "$1" = '-d' ]; then + # we're removing the subkey: + gpg --export "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname" + (cd "$workingdir" && ssh-add -d "$kname") + else + # we're adding the subkey: + mkfifo "$workingdir/$kname" + gpg --quiet --passphrase-fd 3 3<"$workingdir/passphrase" \ + --export-options export-reset-subkey-passwd,export-minimal,no-export-attributes \ + --export-secret-subkeys "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 + fi + keysuccess="$?" + + rm -f "$workingdir/$kname" + done + + rm -rf "$workingdir" + + # FIXME: sort out the return values: we're just returning the + # success or failure of the final authentication subkey in this + # case. What if earlier ones failed? + exit "$keysuccess" +} |