Public bug reported:
I modified /etc/pam.d/common-auth to allow two-factor authentication
using password and either bluetooth proximity or, if that fails, google-
authenticator:
. . .
# here are the per-package modules (the "Primary" block)
auth [success=1 default=ignore] pam_unix.so nullok_secure
# here's the fallback if no module succeeds
auth requisite pam_deny.so
#
auth [success=1 default=ignore] pam_blue.so
auth required pam_google_authenticator.so
#
# prime the stack . . .
This works fine for login, but bluetooth authentication always fails when
unlocking gnome-screensaver with the error message:
Bluetooth scan failure [bluetooth device up?]
The reason seems to be that pam_blue is based on l2cap which requires
root authority to create sockets (l2ping runs as root but fails for a
non-privileged user).
An alternative method of detecting bluetooth proximity is to use hcitool:
hcitool name xx:xx:xx:xx:xx:xx
returns the name of the device whose MAC is given, or nothing on fail, and it
works for a non-privileged user.
Replacing pam_blue with a simple hacked version using hcitool works for both
login and gnome-screensaver unlock:
int rc = PAM_SESSION_ERR;
FILE *fpipe;
char *command="hcitool name xx:xx:xx:xx:xx:xx";
char line[256];
if ( !(fpipe = (FILE*)popen(command,"r")) ) {
perror("Problems with pipe");
exit(1);
}
while ( fgets( line, sizeof line, fpipe)) {
if (strlen(line) > 2) rc = PAM_SUCCESS;
}
pclose(fpipe);
return rc;
This bug probably affects all versions to date, but has been confirmed
in Ubuntu 11.04 and 11.10, and in libpam-blue 0.9.0-3
** Affects: libpam-blue (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/912695
Title:
libpam_blue requires root, fails if non-privileged
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