+ [[ ! -e $XDG_RUNTIME_DIR ]] && ln -sf $t $XDG_RUNTIME_DIR 2>/dev/null
+ unset t
+
+ ## gpg forwarding
+ # NOTE: while ssh automatically sets SSH_AUTH_SOCK with the ForwardSsh
+ # directive, GPG must be forwarded manually. to support this, we
+ # forward the restricted gpg-agent extra socket to the remote host
+ # with a RemoteForward rule in ~/.ssh/config that uses the
+ # _GNUPG_SOCK_* env vars.
+ # to avoid conflicts with other ssh sessions where the same user is
+ # connecting to the same host from different machines, gpg in each
+ # environment should utilize its own forwarded socket, rather than
+ # replace the sockets in GNUPGHOME which will be overridden on the
+ # next connection. previously, you could provide a path to the agent
+ # socket in GPG_AGENT_INFO, but that was deprecated in GPG v2.1.
+ # instead, we must clone GNUPGHOME and replace the agent sockets
+ # there with the forwarded one.
+ # HACK: without SendEnv, which is disabled by default in most sshd configs,
+ # there is no foolproof way to prevent race conditions or filename
+ # collisions, pass the forward path to the remote host environment,
+ # or even know if the forward path exists and is writable. we just
+ # have to guess this path is good on the desination host, and assume
+ # the newest matching socket is the correct one after connecting. in
+ # theory we could occlude the ssh binary on PATH with an alias or
+ # script that communicates with the remote host before opening a
+ # shell, but that would open up too many edge cases where it wouldn't
+ # work to make it worth the effort and extra overhead.
+ # do not run more than once per session, even if resetting shell
+ if [[ $SHLVL == 1 && -v commands[gpg] ]] {
+ export _GNUPG_SOCK_DEST_BASE=/tmp/.gpg-agent-forward
+ export _GNUPG_SOCK_DEST_EXT=$(date +%s).$RANDOM
+ export _GNUPG_SOCK_DEST=$_GNUPG_SOCK_DEST_BASE.$_GNUPG_SOCK_DEST_EXT
+ _sev_gpg_forward_dir=${GNUPGHOME:-~/.gnupg}/.ssh_forward
+ s=($_GNUPG_SOCK_DEST_BASE*(N=oc[1]))
+ # clean up forwards if its session is dead or we ask for it
+ if [[ -d $_sev_gpg_forward_dir ]] {
+ find $_sev_gpg_forward_dir -type d -mindepth 1 -maxdepth 1 |
+ while read -r x; do
+ # NOTE: the only way we can get here is if we are SHLVL 1. if
+ # our own pid already has a dir, it is most likely stale,
+ # or something is very broken—assume the former.
+ p=$(basename $x)
+ if [[ -v _sev_gpg_forward_clean || $$ == $p ]] ||
+ ! kill -0 $p 2>/dev/null; then
+ find $x -mindepth 1 -maxdepth 1 | while read -r y; do
+ unlink $y
+ done
+ rmdir $x
+ fi
+ done
+ unset x p y
+ }
+ # create new forward dir
+ if [[ -n $s && -v SSH_CLIENT ]] {
+ export _sev_gpg_forwarded=
+ mkdir -pm700 $_sev_gpg_forward_dir
+ h=$_sev_gpg_forward_dir/$$
+ mkdir -pm700 $h
+ # XXX: is it safe to link scdaemon socket? can its name be changed?
+ for x in S.scdaemon gpg.conf gpg-agent.conf sshcontrol \
+ pubring.kbx trustdb.gpg private-keys-v1.d crls.d; do
+ ln -s ${GNUPGHOME:-~/.gnupg}/$x $h
+ done
+ export GNUPGHOME=$h
+ unset h
+ for x in $(gpgconf --list-dirs | grep 'agent-.*-\?socket:'); do
+ # dirs are prefixed and percent-encoded—strip and decode
+ # https://stackoverflow.com/a/64312099
+ x=${${x/#agent-*socket:/}//(#b)%([[:xdigit:]](#c2))/${(#):-0x$match[1]}}
+ if [[ ! -v orig ]] {
+ mv $s $x
+ orig=$x
+ } else {
+ ln -s $orig $x
+ }
+ done
+ unset x orig
+ }
+ unset s
+
+ # what we will forward if we start a new ssh connection
+ # NOTE: do this after setting up GNUPGHOME to pick up new socket path;
+ # if already connected over SSH, extra should be the remote one
+ export _GNUPG_SOCK_SRC=$(gpgconf --list-dirs agent-extra-socket)
+ } else {
+ # required for RemoteForward to not error out if the vars are unset
+ export _GNUPG_SOCK_SRC=/nonexistent
+ export _GNUPG_SOCK_DEST=/nonexistent
+ }
+
+ ## gpg agent
+ # always try to start agent during setup
+ if [[ SHLVL == 1 ]] {
+ gpg-connect-agent /bye >/dev/null 2>&1
+ [[ $? -ne 0 && -o interactive ]] &&
+ print -P "%F{red}!!! Can't communicate with GPG agent%f"
+ }
+ # set up tty if it isn't, and we're interactive or in xorg & not forwarded
+ # do not run more than once per session, even if resetting shell
+ if [[ -v commands[gpg-connect-agent] &&
+ ! -v _sev_gpg_forward && ! -v GPG_TTY &&
+ ( -o interactive || -v DISPLAY ) ]] {
+ export GPG_TTY=$(tty)
+ export PINENTRY_USER_DATA=USE_TTY=$((!${+DISPLAY}))
+ gpg-connect-agent UPDATESTARTUPTTY /bye >/dev/null 2>&1
projects / sev's projects / dotfiles.git / blobdiff