Kenno's Open Note

Display Last Login in Reverse

You’ve been using Linux for a while, so you must have seen or used this command before: cat. It’s used to concatenate files and print on the standard output. But do you know there is another command spelled it reversed tac? tac is like cat, but print files in reverse. Here is an example which cat could be handy. I need to print out the last login user in reverse. (By the default, it prints the last login first.) ...

BIOS Firmware for ThinkPad X1 Carbon Gen 6 1.50

Are you still rocking your X1 Carbon Gen 6 in 2020? Well, Lenovo just released a new BIOS firmware 1.50. Here are changes in this release: [Important updates] - Update includes a security fix. - Addresses CVE-2020-8696 and CVE-2020-8698. (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8696) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8698) - Addresses CVE-2020-0587, CVE-2020-0588, CVE-2020-0590, CVE-2020-0591, CVE-2020-0592, and CVE-2020-0593. (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0587) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0588) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0590) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0591) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0592) (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0593) [New functions or enhancements] - Updated the CPU microcode. - Updated the Diagnostics module to version 04.15.000. [Problem fixes] Nothing. It’s worth to note that this new firmware is available on Fedora (33) via fwupdmgr. ...

Freebsd adduser ERROR - User Disappeared During Update

While creating a new user account on one my servers running FreeBSD 12, I encountered the following error: root@nas2:~ # adduser Username: devops Full name: Ansible Operator Uid (Leave empty for default): Login group [devops]: Login group is devops. Invite devops into other groups? []: Login class [default]: Shell (sh csh tcsh nologin) [sh]: Home directory [/home/devops]: Home directory permissions (Leave empty for default): Use password-based authentication? [yes]: no Lock out the account after creation? [no]: no Username : devops Password : <disabled> Full Name : Ansible Operator Uid : 1002 Class : Groups : devops Home : /home/devops Home Mode : Shell : /bin/sh Locked : no OK? (yes/no): yes pw: user 'devops' disappeared during update adduser: ERROR: There was an error adding user (devops). Add another user? (yes/no): no Goodbye! According to a discussion on a FreeBSD forum, the problem could have caused by the databases being out of sync. ...

Fix Duplicating Certificates in FreeIPA

While practicing with certificates reqeust using FreeIPA, I came across this duplicated certificates for the first time. This happened because I also practiced the same thing a few weeks ago. Here is how to re-produce this message: [root@client ~]# ipa-getcert request \ -f /etc/vsftpd/certs/cert.pem \ -k /etc/vsftpd/certs/cert.key \ -K ftp/client.lab.example.net \ -D client.lab.example.net Certificate at same location is already used by request with nickname "20201008131445". Because I’m still not familiar yet with FreeIPA on this certificate topic, I turned to Google search and found very useful information on this blog post: Dealing with Duplicate SSL certs from FreeIPA. ...

BIOS Firmware for ThinkPad P1 Gen1 1.32

Lenovo just released a new BIOS firmware for its ThinkPad P1 Gen 1, v1.32. This version fixes a few issues, as well as update the CPU microcode. Here is the changes from Lenovo’s website. CHANGES IN THIS RELEASE Version 1.32 [Important updates] - Addresses CVE-2020-8696, CVE-2020-8698 - Addresses CVE-2020-8694, CVE-2020-8695 [New functions or enhancements] - Updated the CPU microcode. [Problem fixes] - Fixed an issue where system might hang up at POST when some KVM device was connected. - Fixed an issue where the screen might not be displayed on Thinkpad LCD when opened lid just before startup Windows. - Fixed an issue where system might not boot from network which is connected to ethernet of Thunderbolt3 WS Dock when boot mode is Legacy mode. - Fixed an issue where system might hang at POST when Thunderbolt3 WS Dock is attached. - Fixed an issue where BIOS might generate 0288 beep error. I haven’t had time to update this 1.32 on my machine yet, though I think the update would be just as smooth as previous release on Fedora 32 system. ...