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https://github.com/Matir/skel.git
synced 2026-07-24 13:16:56 -07:00
Improve SSH_AUTH_SOCK handling.
This commit is contained in:
David Tomaschik
263
dotfiles/shenv
263
dotfiles/shenv
@@ -97,143 +97,160 @@ export LVM_SUPPRESS_FD_WARNINGS=1
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export EARTHLY_SSH_AUTH_SOCK=""
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# Handle SSH_AUTH_SOCK for tmux consistency
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_SSH_AUTH_LINK="${HOME}/.ssh/ssh_auth_sock"
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case "$-" in
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*i*)
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_SSH_AUTH_LINK="${HOME}/.ssh/ssh_auth_sock"
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# Helper to check if a path is our link or points to it
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_is_link_path() {
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[ -z "$1" ] && return 1
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_target="${_SSH_AUTH_LINK:-${HOME}/.ssh/ssh_auth_sock}"
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[ "$1" = "${_target}" ] && { unset -v _target; return 0; }
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if [ -L "$1" ] && command -v readlink >/dev/null 2>&1; then
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_T=$(readlink "$1")
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# Handle relative symlinks
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case "${_T}" in /*) ;; *) _T="$(dirname "$1")/${_T}" ;; esac
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[ "${_T}" = "${_target}" ] && { unset -v _target _T; return 0; }
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unset -v _T
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fi
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unset -v _target
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return 1
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}
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# Helper to check if an SSH socket is valid and useful via ssh-add return codes
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_is_valid_ssh_sock() {
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[ -z "$1" ] && return 1
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[ -S "$1" ] || return 1
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if command -v ssh-add >/dev/null 2>&1; then
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SSH_AUTH_SOCK="$1" ssh-add -l >/dev/null 2>&1
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case "$?" in
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0|1) return 0 ;;
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*) return 1 ;;
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esac
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fi
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return 0
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}
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# Function to get the path to the socket for the local ssh-agent
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get_local_ssh_agent_sock() {
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_found=""
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if [ "$(uname)" = "Darwin" ]; then
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_found=$(launchctl getenv SSH_AUTH_SOCK 2>/dev/null)
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elif command -v systemctl >/dev/null 2>&1; then
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# Query systemd socket units directly to avoid environment overrides.
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for _u in ssh-agent.socket openssh-agent.socket gcr-ssh-agent.socket gpg-agent-ssh.socket; do
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_p=$(systemctl --user show "${_u}" -p Listen 2>/dev/null | cut -d= -f2- | cut -d' ' -f1)
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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_found="${_p}"
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break
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# Helper to check if a path is our link or points to it
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_is_link_path() {
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[ -z "$1" ] && return 1
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_target="${_SSH_AUTH_LINK:-${HOME}/.ssh/ssh_auth_sock}"
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[ "$1" = "${_target}" ] && { unset -v _target; return 0; }
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if [ -L "$1" ] && command -v readlink >/dev/null 2>&1; then
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_T=$(readlink "$1")
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# Handle relative symlinks
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case "${_T}" in /*) ;; *) _T="$(dirname "$1")/${_T}" ;; esac
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[ "${_T}" = "${_target}" ] && { unset -v _target _T; return 0; }
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unset -v _T
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fi
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done
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# Fallback to systemd environment
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if [ -z "${_found}" ] || _is_link_path "${_found}" || ! _is_valid_ssh_sock "${_found}"; then
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_found=$(systemctl --user show-environment 2>/dev/null | grep "^SSH_AUTH_SOCK=" | cut -d= -f2-)
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fi
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fi
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unset -v _target
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return 1
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}
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if [ -n "${_found}" ] && ! _is_link_path "${_found}" && _is_valid_ssh_sock "${_found}"; then
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echo "${_found}"
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unset -v _found _u _p
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return 0
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fi
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# Helper to check if an SSH socket is valid and useful
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_is_valid_ssh_sock() {
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[ -z "$1" ] && return 1
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[ -S "$1" ] || return 1
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# Search common fallback paths
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_u=$(id -u)
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for _p in "/run/user/${_u}/keyring/ssh" "/run/user/${_u}/ssh-agent.socket" "/run/user/${_u}/openssh_agent" "/run/user/${_u}/gnupg/S.gpg-agent.ssh"; do
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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echo "${_p}"
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unset -v _found _u _p
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if command -v nc >/dev/null 2>&1; then
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# Use nc to quickly check if the socket is listening.
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# We use -N to shutdown the socket after EOF on stdin (for OpenBSD netcat compatibility).
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if echo '' | nc -w 1 -N -U "$1" >/dev/null 2>&1; then
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return 0
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fi
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fi
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if command -v ssh-add >/dev/null 2>&1; then
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SSH_AUTH_SOCK="$1" ssh-add -l >/dev/null 2>&1
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case "$?" in
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0|1) return 0 ;;
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*) return 1 ;;
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esac
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fi
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if command -v nc >/dev/null 2>&1; then
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return 1
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fi
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return 0
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fi
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done
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}
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# Search /run/user/UID and /tmp for agent.* sockets
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_search=""
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for _d in "/run/user/${_u}" /tmp; do [ -d "${_d}" ] && _search="${_search} ${_d}"; done
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if [ -n "${_search}" ]; then
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for _p in $(find ${_search} -maxdepth 2 -type s -name 'agent.*' 2>/dev/null); do
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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echo "${_p}"
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unset -v _found _u _p _search _d
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# Function to get the path to the socket for the local ssh-agent
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get_local_ssh_agent_sock() {
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_found=""
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if [ "$(uname)" = "Darwin" ]; then
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_found=$(launchctl getenv SSH_AUTH_SOCK 2>/dev/null)
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elif command -v systemctl >/dev/null 2>&1; then
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# Query systemd socket units directly to avoid environment overrides.
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for _u in ssh-agent.socket openssh-agent.socket gcr-ssh-agent.socket gpg-agent-ssh.socket; do
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_p=$(systemctl --user show "${_u}" -p Listen 2>/dev/null | cut -d= -f2- | cut -d' ' -f1)
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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_found="${_p}"
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break
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fi
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done
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# Fallback to systemd environment
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if [ -z "${_found}" ] || _is_link_path "${_found}" || ! _is_valid_ssh_sock "${_found}"; then
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_found=$(systemctl --user show-environment 2>/dev/null | grep "^SSH_AUTH_SOCK=" | cut -d= -f2-)
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fi
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fi
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if [ -n "${_found}" ] && ! _is_link_path "${_found}" && _is_valid_ssh_sock "${_found}"; then
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echo "${_found}"
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unset -v _found _u _p
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return 0
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fi
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done
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fi
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unset -v _found _u _p _search _d
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return 1
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}
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# Search common fallback paths
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_u=$(id -u)
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for _p in "/run/user/${_u}/keyring/ssh" "/run/user/${_u}/ssh-agent.socket" "/run/user/${_u}/openssh_agent" "/run/user/${_u}/gnupg/S.gpg-agent.ssh"; do
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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echo "${_p}"
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unset -v _found _u _p
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return 0
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fi
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done
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# Function to reset SSH_AUTH_SOCK to the local ssh-agent
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reset_ssh_socket() {
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_rss_sock=$(get_local_ssh_agent_sock)
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if [ -n "${_rss_sock}" ]; then
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_rss_link="${HOME}/.ssh/ssh_auth_sock"
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mkdir -p "$(dirname "${_rss_link}")"
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ln -sf "${_rss_sock}" "${_rss_link}"
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export SSH_AUTH_SOCK="${_rss_link}"
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if command -v systemctl >/dev/null 2>&1; then
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systemctl --user set-environment SSH_AUTH_SOCK="${_rss_link}" 2>/dev/null
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# Search /run/user/UID and /tmp for agent.* sockets
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_search=""
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for _d in "/run/user/${_u}" /tmp; do [ -d "${_d}" ] && _search="${_search} ${_d}"; done
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if [ -n "${_search}" ]; then
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for _p in $(find ${_search} -maxdepth 2 -type s -name 'agent.*' 2>/dev/null); do
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if ! _is_link_path "${_p}" && _is_valid_ssh_sock "${_p}"; then
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echo "${_p}"
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unset -v _found _u _p _search _d
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return 0
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fi
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done
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fi
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unset -v _found _u _p _search _d
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return 1
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}
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# Function to reset SSH_AUTH_SOCK to the local ssh-agent
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reset_ssh_socket() {
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_rss_sock=$(get_local_ssh_agent_sock)
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if [ -n "${_rss_sock}" ]; then
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_rss_link="${HOME}/.ssh/ssh_auth_sock"
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mkdir -p "$(dirname "${_rss_link}")"
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ln -sf "${_rss_sock}" "${_rss_link}"
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export SSH_AUTH_SOCK="${_rss_link}"
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if command -v systemctl >/dev/null 2>&1; then
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systemctl --user set-environment SSH_AUTH_SOCK="${_rss_link}" 2>/dev/null
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fi
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echo "Reset SSH_AUTH_SOCK to ${_rss_link} -> ${_rss_sock}"
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unset -v _rss_sock _rss_link
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return 0
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else
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echo "reset_ssh_socket: no valid local ssh-agent socket found." >&2
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unset -v _rss_sock
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return 1
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fi
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}
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_CANDIDATE=""
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# 1. If current environment has a valid socket that is NOT our link, it's a prime candidate
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# (e.g. fresh SSH login: sshd sets SSH_AUTH_SOCK to the raw forwarded socket before ssh/rc
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# rewrites it to the stable symlink; the shell inherits the original raw path).
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if ! _is_link_path "${SSH_AUTH_SOCK:-}" && _is_valid_ssh_sock "${SSH_AUTH_SOCK:-}"; then
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_CANDIDATE="${SSH_AUTH_SOCK}"
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fi
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echo "Reset SSH_AUTH_SOCK to ${_rss_link} -> ${_rss_sock}"
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unset -v _rss_sock _rss_link
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return 0
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else
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echo "reset_ssh_socket: no valid local ssh-agent socket found." >&2
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unset -v _rss_sock
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return 1
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fi
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}
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_CANDIDATE=""
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# 2. Only look for a system agent if the stable link is already broken. If the link is
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# valid (e.g. a tmux pane where SSH_AUTH_SOCK points to our symlink which ssh/rc just
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# updated to the forwarded socket), leave it alone — don't clobber it with a local agent.
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if [ -z "${_CANDIDATE}" ] && ! _is_valid_ssh_sock "${_SSH_AUTH_LINK}"; then
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_CANDIDATE=$(get_local_ssh_agent_sock)
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fi
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# 1. If current environment has a valid socket that is NOT our link, it's a prime candidate
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# (e.g. fresh SSH login: sshd sets SSH_AUTH_SOCK to the raw forwarded socket before ssh/rc
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# rewrites it to the stable symlink; the shell inherits the original raw path).
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if ! _is_link_path "${SSH_AUTH_SOCK:-}" && _is_valid_ssh_sock "${SSH_AUTH_SOCK:-}"; then
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_CANDIDATE="${SSH_AUTH_SOCK}"
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fi
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# 3. Sync the stable link if we found a valid "real" socket.
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if [ -n "${_CANDIDATE}" ] && ! _is_link_path "${_CANDIDATE}" && _is_valid_ssh_sock "${_CANDIDATE}"; then
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mkdir -p "$(dirname "${_SSH_AUTH_LINK}")"
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ln -sf "${_CANDIDATE}" "${_SSH_AUTH_LINK}"
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export SSH_AUTH_SOCK="${_SSH_AUTH_LINK}"
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# Update systemd if present to keep everything in sync
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if command -v systemctl >/dev/null 2>&1; then
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systemctl --user set-environment SSH_AUTH_SOCK="${_SSH_AUTH_LINK}" 2>/dev/null
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fi
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elif _is_valid_ssh_sock "${_SSH_AUTH_LINK}"; then
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# If we found nothing better but the link is valid, use it.
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export SSH_AUTH_SOCK="${_SSH_AUTH_LINK}"
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fi
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# 2. Only look for a system agent if the stable link is already broken. If the link is
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# valid (e.g. a tmux pane where SSH_AUTH_SOCK points to our symlink which ssh/rc just
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# updated to the forwarded socket), leave it alone — don't clobber it with a local agent.
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if [ -z "${_CANDIDATE}" ] && ! _is_valid_ssh_sock "${_SSH_AUTH_LINK}"; then
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_CANDIDATE=$(get_local_ssh_agent_sock)
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fi
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# 3. Sync the stable link if we found a valid "real" socket.
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if [ -n "${_CANDIDATE}" ] && ! _is_link_path "${_CANDIDATE}" && _is_valid_ssh_sock "${_CANDIDATE}"; then
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mkdir -p "$(dirname "${_SSH_AUTH_LINK}")"
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ln -sf "${_CANDIDATE}" "${_SSH_AUTH_LINK}"
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export SSH_AUTH_SOCK="${_SSH_AUTH_LINK}"
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# Update systemd if present to keep everything in sync
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if command -v systemctl >/dev/null 2>&1; then
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systemctl --user set-environment SSH_AUTH_SOCK="${_SSH_AUTH_LINK}" 2>/dev/null
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fi
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elif _is_valid_ssh_sock "${_SSH_AUTH_LINK}"; then
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# If we found nothing better but the link is valid, use it.
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export SSH_AUTH_SOCK="${_SSH_AUTH_LINK}"
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fi
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unset _SSH_AUTH_LINK _CANDIDATE
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unset _SSH_AUTH_LINK _CANDIDATE
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;;
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esac
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# Setup XDG-like dirs on MacOS
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# Based on https://leebyron.com/til/mac-xdg/
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