applications/slock
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disable_kill

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This commit is contained in:
Christopher Jeffrey 2014-09-19 02:15:38 -07:00
parent 8bdd144daa
commit 5a7ab3ff79
2 changed files with 11 additions and 9 deletions
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4
README
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@ -31,8 +31,8 @@ Changes by chjj
wrong password or pressed ALT/CTRL/F1-13/SYSRQ. See twilio_example.h to create a wrong password or pressed ALT/CTRL/F1-13/SYSRQ. See twilio_example.h to create a
twilio.h file. You will need a twilio account to set this up. twilio.h file. You will need a twilio account to set this up.
- Disabling alt+sysrq before shutting down: This prevents an attacker from - Disabling alt+sysrq and ctrl+alt+backspace before shutting down: This
alt+sysrq+k'ing the screenlock quickly before the shutdown. prevents an attacker from killing the screenlock quickly before the shutdown.
- This requires a sudoers option to be set in /etc/sudoers: - This requires a sudoers option to be set in /etc/sudoers:

16
slock.c
View File

@ -148,9 +148,10 @@ error:
return NULL; return NULL;
} }
// Disable alt+sysrq - keeps the attacker from alt+sysrq+k'ing our process // Disable alt+sysrq and crtl+alt+backspace - keeps the
// attacker from alt+sysrq+k'ing our process
static void static void
disable_sysrq(void) { disable_kill(void) {
#if POWEROFF #if POWEROFF
// Needs sudo privileges - alter your /etc/sudoers file: // Needs sudo privileges - alter your /etc/sudoers file:
// [username] [hostname] =NOPASSWD: /usr/bin/tee /proc/sys/kernel/sysrq // [username] [hostname] =NOPASSWD: /usr/bin/tee /proc/sys/kernel/sysrq
@ -438,8 +439,8 @@ readpw(Display *dpy, const char *pws)
// Poweroff if there are more than 5 bad attempts. // Poweroff if there are more than 5 bad attempts.
if(lock_tries > 5) { if(lock_tries > 5) {
// Disable alt+sysrq // Disable alt+sysrq and crtl+alt+backspace
disable_sysrq(); disable_kill();
// Take a webcam shot of whoever is tampering with our machine: // Take a webcam shot of whoever is tampering with our machine:
webcam_shot(0); webcam_shot(0);
@ -482,7 +483,7 @@ readpw(Display *dpy, const char *pws)
case XK_Escape: case XK_Escape:
len = 0; len = 0;
break; break;
case XK_BackSpace: case XK_Delete:
if(len) if(len)
--len; --len;
break; break;
@ -503,8 +504,9 @@ readpw(Display *dpy, const char *pws)
case XK_F11: case XK_F11:
case XK_F12: case XK_F12:
case XK_F13: case XK_F13:
// Disable alt+sysrq case XK_BackSpace:
disable_sysrq(); // Disable alt+sysrq and crtl+alt+backspace
disable_kill();
// Take a webcam shot of whoever is tampering with our machine: // Take a webcam shot of whoever is tampering with our machine:
webcam_shot(0); webcam_shot(0);