SV-96423r3_rule
V-81709
SRG-OS-000329-GPOS-00128
SLES-12-010131
CAT II
10
Configure the operating system to lock an account for the maximum period when three unsuccessful logon attempts in 15 minutes are made.
Modify the first three lines of the auth section "/etc/pam.d/common-auth" file to match the following lines:
auth required pam_tally2.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900
auth sufficient pam_unix.so try_first_pass
auth [default=die] pam_tally2.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900
Add or modify the following line in the /etc/pam.d/common-account file:
account required pam_tally2.so
Note: Manual changes to the listed files may be overwritten by the "authconfig" program. The "authconfig" program should not be used to update the configurations listed in this requirement.
Verify the operating system automatically locks an account for the maximum period for which the system can be configured.
Check that the system locks an account for the maximum period after three unsuccessful logon attempts within a period of 15 minutes with the following command:
# grep pam_tally2.so /etc/pam.d/common-auth
auth required pam_tally2.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900
auth [default=die] pam_tally2.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900
If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_tally2.so" module, or is missing from these lines, this is a finding.
Note: The maximum configurable value for "unlock_time" is "604800".
Verify that "pam_tally2.so" is configured for all accounts:
# grep pam_tally2.so /etc/pam.d/common-account
account required pam_tally2.so
If the above line is missing or is commented out, this is a finding.
V-81709
False
SLES-12-010131
Verify the operating system automatically locks an account for the maximum period for which the system can be configured.
Check that the system locks an account for the maximum period after three unsuccessful logon attempts within a period of 15 minutes with the following command:
# grep pam_tally2.so /etc/pam.d/common-auth
auth required pam_tally2.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900
auth [default=die] pam_tally2.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900
If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_tally2.so" module, or is missing from these lines, this is a finding.
Note: The maximum configurable value for "unlock_time" is "604800".
Verify that "pam_tally2.so" is configured for all accounts:
# grep pam_tally2.so /etc/pam.d/common-account
account required pam_tally2.so
If the above line is missing or is commented out, this is a finding.
M
2903