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Sudo loopback improve (#435)
* small improvements to loopback setup and --sudo * support reading hostname from file also tolerate not finding the hostname (fill localhost) address #428 * cleanup and support sup,sud,pkexec
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Jaromil
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tomb
85
tomb
@ -113,9 +113,35 @@ export TEXTDOMAIN=tomb
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# Wrap sudo with a more visible message or apply user-supplied alternative to sudo
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_sudo() {
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_verbose "Enter password for user ::1 user:: to gain superuser privileges" $USER
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_verbose "Using ::1 exec:: for privilege escalation" $SUDO
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${=SUDO} ${@}
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if option_is_set --sudo; then
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pescmd=`option_value --sudo`
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case `basename $pescmd` in
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"doas"|"sup"|"sud"|"pkexec")
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command -v $pescmd > /dev/null || _failure "$pescmd executable not found"
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_verbose "Super user execution using $pescmd"
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${pescmd} ${@}
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return $?
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;;
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"skip"|"none")
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_verbose "Super user execution skipped (SUID caller)"
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${@}
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return $?
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;;
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*)
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_failure "Super user execution not supported: ::1 sudo::" "`option_value --sudo`"
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;;
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esac
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else
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local msg="[sudo] Enter password for user ::1 user:: to gain superuser privileges"
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command -v gettext 1>/dev/null 2>/dev/null && msg="$(gettext -s "$msg")"
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msg=${(S)msg//::1*::/$USER}
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sudo -p "
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$msg
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" ${@}
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return $?
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fi
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}
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# Cleanup anything sensitive before exiting.
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@ -557,7 +583,7 @@ is_valid_tomb() {
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# Tomb file may be a LUKS FS (or we are creating it)
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[[ "`file $1`" =~ "luks encrypted file" ]] || {
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_warning "File is not yet a tomb: ::1 tomb file::" $1 }
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_message "File is not yet a tomb: ::1 tomb file::" $1 }
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# We set global variables
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typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBMAPPER
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@ -581,8 +607,8 @@ is_valid_tomb() {
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# checks if Tomb already mounted (or we cannot alter it)
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local maphash=`realpath $TOMBPATH | sha256sum -z`
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local nextloop=`_sudo losetup -f`
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TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $nextloop`"
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lo_mount # fills TOMBLOOP with next loop
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TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $TOMBLOOP`"
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local mounted_tombs=(`list_tomb_mounts`)
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local usedmapper
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for t in ${mounted_tombs}; do
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@ -604,7 +630,7 @@ lo_mount() {
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tpath="$1"
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# check if we have support for loop mounting
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TOMBLOOP=`_sudo losetup -f`
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TOMBLOOP=`losetup -f`
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[[ $? = 0 ]] || {
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_warning "Loop mount of volumes is not possible on this machine, this error"
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_warning "often occurs on VPS and kernels that don't provide the loop module."
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@ -612,9 +638,14 @@ lo_mount() {
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_failure "Operation aborted."
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}
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_sudo losetup -f "$tpath" # allocates the next loopback for our file
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[[ "$tpath" == "" ]] && return 0
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# allocates the next loopback for our file
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_sudo losetup -f "$tpath" || _failure "Loopback mount failed: ::1 path:: on ::2 loop::" "$tpath" $TOMBLOOP
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TOMBLOOPDEVS+=("$TOMBLOOP") # add to array of lodevs used
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return 0
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}
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@ -702,7 +733,7 @@ usage() {
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_print " -g use a GnuPG key to encrypt a tomb key"
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_print " -r provide GnuPG recipients (separated by comma)"
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_print " -R provide GnuPG hidden recipients (separated by comma)"
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_print " --sudo alternative to sudo such as doas (command or absolute path)"
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_print " --sudo super user exec alternative to sudo (doas or none)"
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[[ $SPHINX == 1 ]] && {
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_print " --sphx-user user associated with the key (for use with pitchforkedsphinx)"
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@ -2023,11 +2054,10 @@ lock_tomb_with_key() {
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return 1
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;;
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esac
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# TODO: check validity, only ext3 or 4 or btrfs support
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_success "Selected filesystem type $filesystem."
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}
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lo_mount $TOMBPATH
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lo_mount "$TOMBPATH"
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_verbose "Loop mounted on ::1 mount point::" $TOMBLOOP
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@ -2114,7 +2144,7 @@ change_tomb_key() {
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is_valid_tomb $tombpath
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lo_mount $TOMBPATH
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lo_mount "$TOMBPATH"
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_sudo cryptsetup isLuks ${TOMBLOOP}
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# is it a LUKS encrypted nest? we check one more time
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@ -2236,7 +2266,7 @@ mount_tomb() {
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_failure "Mountpoint already in use: ::1 mount point::" "$tombmount"
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done
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lo_mount $TOMBPATH
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lo_mount "$TOMBPATH"
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_sudo cryptsetup isLuks ${TOMBLOOP} || {
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# is it a LUKS encrypted nest? see cryptsetup(1)
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@ -2360,7 +2390,13 @@ mount_tomb() {
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_update_control_file "${tombmount}/.uid" $_UID
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_update_control_file "${tombmount}/.tty" $_TTY
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# also the hostname
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if command -v hostname >/dev/null; then
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_update_control_file "${tombmount}/.host" `hostname`
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elif [[ -r /etc/hostname ]]; then
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_update_control_file "${tombmount}/.host" $(_cat /etc/hostname)
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else
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_update_control_file "${tombmount}/.host" localhost
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fi
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# and the "last time opened" information
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# in minutes since 1970, this is printed at next open
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_update_control_file "${tombmount}/.last" `date +%s`
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@ -3255,27 +3291,8 @@ main() {
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option_is_set --tmp && TMPDIR=$(option_value --tmp)
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option_is_set --sudo && {
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local _opt=`option_value --sudo`
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case $_opt in
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"sudo") # the worst default ever
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SUDO=sudo
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;;
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"doas") # openbsd
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SUDO=doas
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;;
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"pkexec") # policykit
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SUDO=pkexec
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;;
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"sup") # https://sup.dyne.org
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SUDO=sup
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;;
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"sud") # https://sud.dyne.org
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SUDO=sud
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;;
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*)
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_failure "Invalid privilege escalation tool: ::1 exec::" $_opt
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;;
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esac
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local _opt=`basename $(option_value --sudo)`
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_message "Privilege escalation tool configured: ::1 exec::" $_opt
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}
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# When we run as root, we remember the original uid:gid to set
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