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zshenv: do not prefer /opt over system for path
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1# NOTE:
2# our .zprofile can be expensive, so we keep track of what has been run
3# already, and only set up what is necessary. this also allows us to re-source
4# the file to reinitialize specific parts when desired.
5#
6# in order to ensure future interactive environments are set up as early as
7# possible, we source this file from .zshenv for non-login shells, under some
8# specific conditions outlined there.
9#
10# this file respects non-interactive sessions and will not intentionally emit
11# output.
12
13### fix path after system profile scripts have possibly mangled it
14if [[ ! -v _sev_setup_path || -o login ]] {
15 _sev_setpath
16 export _sev_setup_path=
17}
18
19### dbus
20if [[ ! -v DBUS_SESSION_BUS_ADDRESS && -v commands[dbus-launch] ]] {
21 eval $(dbus-launch)
22 export DBUS_SESSION_BUS_ADDRESS DBUS_SESSION_BUS_PID
23}
24
25### gpg agent + forwarding
26# NOTE: while ssh manages its auth sock in-protocol when ForwardSsh is enabled,
27# GPG must be forwarded manually over Unix socket. to support this, we
28# forward the restricted gpg-agent extra socket to the remote host with a
29# RemoteForward rule in ~/.ssh/config that uses the _GNUPG_SOCK_* vars.
30#
31# to avoid conflicts with other ssh sessions where the same user is
32# connecting to the same host from different machines, gpg should utilize
33# its own forwarded socket for each session. previously, you could
34# provide a path to the agent socket in GPG_AGENT_INFO, but that was
35# deprecated in GPG v2.1; instead, we must replace the socket in gpg's
36# socket dir.
37#
38# gnupg commits fb88f37–aab8a0b moved sockets from GNUPGHOME by default
39# to directories under /run. aab8a0b in particular solidifies the
40# functionality shift to utilize systemd-logind's user runtime
41# directories. if the dir isn't found, gpg will fall back to the homedir.
42# since previous functionality allowed multiple homedirs with multiple
43# sockets, a provision was added where changing GNUPGHOME will also
44# change the socket dir to a hashed dir under the usual runtime dir.
45#
46# utilizing this information, we can conclude:
47# - on systems with user runtime dirs, changing GNUPGHOME will also
48# give us a unique socket dir under the user runtime dir;
49# - on other systems, the socket dir follows GNUPGHOME.
50# therefore, the safest way to ensure unique sockets while not having to
51# write specific logic for both scenarios is to simply change GNUPGHOME.
52# the easiest way to do this is to create a new dir and link the contents
53# of GNUPGHOME to the new home. we can then replace all of the agent
54# sockets wherever they now are with the forwarded one. in either case we
55# will be overwriting the session-specific sockets.
56#
57# NOTE: since Unix sockets are not supported under Windows, this will not work
58# under msys, cygwin, mingw, etc., but may work under wsl2.
59#
60# HACK: without SendEnv, which is disabled by default in most sshd configs,
61# there is no foolproof way to prevent race conditions via socket
62# filename collisions or to pass the desired forward path to the remote
63# host environment. we just have to guess the path we choose is good on
64# the desination, and assume the newest matching socket is the correct
65# one after connecting. in theory, we could occlude the ssh binary on
66# PATH with an alias or script that would allow us to communicate with
67# the remote host before opening a shell, so that we can have the host
68# communicate back to the client where it wants a socket created or ask
69# the host if the path the client wants to use is writable. however, this
70# would open up too many edge cases where it wouldn't work or be too
71# clunky (e.g. asking for password twice) to make it worth it.
72function _gpg_socketpath {
73 # dirs are percent-encoded: https://stackoverflow.com/a/64312099
74 echo -E - ${1//(#b)%([[:xdigit:]](#c2))/${(#):-0x$match[1]}}
75}
76if [[ ! -v _sev_setup_gpg_forward && -v commands[gpg] ]] {
77 # XXX: assuming /tmp exists and is writable on destination
78 export _GNUPG_SOCK_DEST_BASE=/tmp/.gpg-agent-forward
79 export _GNUPG_SOCK_DEST_EXT=$(date +%s).$RANDOM
80 export _GNUPG_SOCK_DEST=$_GNUPG_SOCK_DEST_BASE.$_GNUPG_SOCK_DEST_EXT
81 export _sev_gpg_forward_dir=$XDG_RUNTIME_DIR/gnupg/.ssh_forward
82 _sev_zcleanup gpg-forward
83
84 # find our forwarded socket
85 s=($_GNUPG_SOCK_DEST_BASE*(N=oc[1]))
86 if [[ -n $s && -v SSH_CLIENT ]] {
87 # create new forward dir
88 export _sev_setup_gpg_forward=
89 h=$_sev_gpg_forward_dir/$$
90 mkdir -pm700 $h
91 for x (gpg{,-agent}.conf sshcontrol random_seed
92 pubring.kbx{,~} trustdb.gpg private-keys-v1.d crls.d) {
93 ln -s ${GNUPGHOME:-~/.gnupg}/$x $h
94 }
95 export GNUPGHOME=$h
96 unset h
97 for x in $(gpgconf --list-dirs | grep 'agent-.*-\?socket:'); do
98 x=$(_gpg_socketpath ${x/#agent-*socket:})
99 if [[ ! -v primary ]] {
100 # move forwarded socket to first valid agent socket path
101 # XXX: if tmp is on different filesystem this may not work
102 mv $s $x
103 primary=$x
104 } else {
105 # make links to forwarded socket for any others
106 ln -s $primary $x
107 }
108 done
109 unset x primary
110 }
111 unset s
112
113 # what we will forward if we start a new ssh connection
114 # NOTE: do this after setting up GNUPGHOME to pick up new socket path;
115 # if already connected over SSH, extra should be the remote one
116 export _GNUPG_SOCK_SRC=$(_gpg_socketpath \
117 $(gpgconf --list-dirs agent-extra-socket))
118} elif [[ ! -v _sev_setup_gpg_forward ]] {
119 # required for RemoteForward to not error out if the vars are unset
120 [[ ! -v _GNUPG_SOCK_SRC ]] && export _GNUPG_SOCK_SRC=/nonexistent
121 [[ ! -v _GNUPG_SOCK_DEST ]] && export _GNUPG_SOCK_DEST=/nonexistent
122}
123
124### gpg agent
125if [[ -v commands[gpg-connect-agent] &&
126 ( ! -v _sev_setup_gpgagent || -v _sev_refresh_gpgagent ) ]] {
127 # avoid printing if we have already set up tty before
128 [[ ! -v _sev_setup_gpgagent && -o interactive ]] && p=true || p=false
129 if {$p} {
130 print -nP '%F{blue}>>>%f GPG: '
131 if [[ -v _sev_setup_gpg_forward ]] {
132 print -nP '%F{yellow}Forwarded agent '
133 } else {
134 print -nP '%F{green}Agent '
135 }
136 }
137 gpg-connect-agent /bye >/dev/null 2>&1
138 if [[ $? -ne 0 ]] {
139 $p && print -P '%F{red}communication error'
140 } else {
141 if [[ ! -v _sev_setup_gpg_forward ]] {
142 if [[ ${+GPG_TTY} -eq 0 && -o interactive ]]
143 export GPG_TTY=$(tty)
144 if [[ ( -v DISPLAY || -v WAYLAND_DISPLAY ) &&
145 ${PINENTRY_USER_DATA/USE_TTY=0} == $PINENTRY_USER_DATA ]]
146 export PINENTRY_USER_DATA=USE_TTY=0
147 # XXX: we are assuming this is our pinentry from .local/bin
148 sed -Ei 's\1f^([[:space:]]*pinentry-program[[:space:]]).*$\1f\1'$HOME'/.local/bin/pinentry\1f' \
149 ${GNUPGHOME:-~/.gnupg}/gpg-agent.conf 2>/dev/null
150 # XXX: could check for changes before doing this to save perf
151 gpg-connect-agent RELOADAGENT UPDATESTARTUPTTY /bye >/dev/null 2>&1
152 if {$p} {
153 gpg-connect-agent /subst /serverpid \
154 "/echo pid \${get serverpid} on ${WAYLAND_DISPLAY:-${DISPLAY:-$GPG_TTY}}" /bye 2>/dev/null
155 print -nP '%f'
156 }
157 } elif {$p} {
158 print -P '%f'
159 }
160 export _sev_setup_gpgagent=
161 }
162 unset p _sev_refresh_gpgagent
163}
164
165### ssh agent
166if [[ ! -v _sev_setup_ssh ]] {
167 # NOTE: preferred order of agents to check: okcagent, gnupg, openssh
168 # first block takes care of okcagent and openssh, second gnupg
169 # XXX: doesn't actually check if ssh is enabled in gpg
170 [[ -o interactive ]] && print -nP '%F{blue}>>>%f SSH: %F{green}'
171 if [[ ! -v SSH_AUTH_SOCK && ( -v commands[okc-ssh-agent] ||
172 ( -v commands[ssh-agent] && ! -v commands[gpg] ) ) ]] {
173 okc=${commands[okc-ssh-agent]:+okc-}
174 e=$_sev_tmp/${okc}ssh-agent-exports
175 typeset sock=
176 typeset -i pid=
177 if [[ -f $e ]] {
178 IFS=$'\0' read -r sock pid <$e
179 }
180 if [[ -S $sock && $pid > 0 ]] && kill -0 $pid >/dev/null 2>&1; then
181 [[ -o interactive ]] && print -P "Reusing agent PID $pid%f"
182 export SSH_AUTH_SOCK=$sock
183 export SSH_AGENT_PID=$pid
184 else
185 # TODO: ensure ssh-agent path looks legit to avoid unsafe eval?
186 # XXX: doesn't appear to be any other way to handle redirection.
187 # because eval needs to write to current scope environment
188 # subshells can't be used to capture output and print.
189 c='TMPDIR=$_sev_tmp ${okc}ssh-agent'
190 if [[ -o interactive ]] {
191 eval $(eval $=c)
192 print -nP '%f'
193 } else {
194 eval $(eval $=c) >/dev/null 2>&1
195 }
196 echo -En - $SSH_AUTH_SOCK$'\0'$SSH_AGENT_PID >!$e
197 unset c
198 fi
199 unset okc e sock pid
200 } elif [[ ! -v SSH_AUTH_SOCK && -v commands[gpg] ]] {
201 # since gpg should have been started above, just export and notify
202 if [[ -o interactive ]] {
203 if [[ -v _sev_setup_gpg_forward ]] {
204 echo 'Forwarded GPG agent'
205 } else {
206 gpg-connect-agent /subst /serverpid \
207 '/echo GPG agent pid ${get serverpid}' /bye
208 }
209 print -nP '%f'
210 }
211 export SSH_AUTH_SOCK=$(_gpg_socketpath \
212 $(gpgconf --list-dirs agent-ssh-socket))
213 } elif [[ -v SSH_AUTH_SOCK ]] {
214 [[ -o interactive ]] && print -P 'Preconfigured agent%f'
215 } else {
216 [[ -o interactive ]] && print -P '%F{red}No agent available%f'
217 }
218
219 export _sev_setup_ssh=
220}
221unfunction _gpg_socketpath
222
223### load site-specific
224load-site-dotfile zprofile
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