2 releases
0.1.1 | Apr 13, 2023 |
---|---|
0.1.0 | Apr 13, 2023 |
#553 in Unix APIs
21 downloads per month
10KB
prompt-of-power
A tiny tool to change your shell prompt when you have elevated capabilities.
Traditionally, Unix shells display a prompt of $
for regular users
and #
for root (UID 0). On modern Linux systems, it's possible to
use capabilities to have elevated privilege even if not UID 0. Some
of those capabilities give privileges thar are just as dangerous as
being root (indeed, CAP_SETUID
allows you to become root). However,
most shells won't give any indication that you have those raised
privileges, so you'll have no warning before making a dangerous
mistake.
Usage
For bash
you can use prompt-of-power
by replacing \$
with
$(prompt-of-power)
in PS1
.
For example:
$ PATH=$PATH:~/.cargo/bin
$ PS1='$(prompt-of-power) '
$
If you are UID 0, this will show a #
prompt:
$ sudo -s
# id -au
0
#
If you are a regular user with no raised capabilities, it will show a normal $
prompt:
$ id -au
1000
$ capsh --print | grep IAB
Current IAB:
$
If you are a regular (non UID 0) user, but have any raised
capabilities it will show a $#
prompt:
$ id -au
1000
$ unshare -Uc --keep-caps
$# id -au
1000
$# capsh --print | grep IAB
Current IAB: ^cap_chown,^cap_dac_override,^cap_dac_read_search,^cap_fowner,^cap_fsetid,^cap_kill,^cap_setgid,^cap_setuid,^cap_setpcap,^cap_linux_immutable,^cap_net_bind_service,^cap_net_broadcast,^cap_net_admin,^cap_net_raw,^cap_ipc_lock,^cap_ipc_owner,^cap_sys_module,^cap_sys_rawio,^cap_sys_chroot,^cap_sys_ptrace,^cap_sys_pacct,^cap_sys_admin,^cap_sys_boot,^cap_sys_nice,^cap_sys_resource,^cap_sys_time,^cap_sys_tty_config,^cap_mknod,^cap_lease,^cap_audit_write,^cap_audit_control,^cap_setfcap,^cap_mac_override,^cap_mac_admin,^cap_syslog,^cap_wake_alarm,^cap_block_suspend,^cap_audit_read,^cap_perfmon,^cap_bpf,^cap_checkpoint_restore
Dependencies
~310KB