Questions tagged [audit]

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AuditD and SysCall alerts

Given an alert rule like -a always,exit -F arch=b32 -S open -S openat -F exit=-EACCES -k access how does adding multiple SysCalls (-S) options work? When an application gets executed do all the ...
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certificate authority “like” or similar service that provides open source audit and certificate proving project does not contain malicious code

Compliance is not my area, so I apologize for the naive language, as I am having trouble explicitly articulating my want, beyond the following anecdote: If one were to build a solution for an audience ...
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15 views

auditd/audisp-remote with Kerberos failing to successfully connect

I've been attempting to get audisp-remote/auditd to work with kerberos on the adm interface of some servers. It works without issues on the audit.example.com but when trying it with the audit-adm....
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How to filter by “comm” event field value in auditd rule

Is there a way to filter auditd rule by the "comm" event field? Reading through the auditctl manpage https://man7.org/linux/man-pages/man8/auditctl.8.html no mention of such is seen. For ...
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What caused traffic on port 631?

After I turn on my computer, something triggers tcp packets from localhost with source port 631. I replicated the packets using the command ipptools. Assuming I got it right, is there a way for me to ...
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1answer
93 views

accessing /var/log/audit/audit.log without root password

under RHEL 7.8 drwxr-xr-x. 20 root root 4096 May 1 11:13 var drwxr-xr-x. 24 root root 4096 Sep 27 03:22 log drwx------. 2 root root 4096 Sep 2 03:34 audit -rw-------...
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SUSE LINUX 11 - Being Able To Collect User Information (Audit)

I added the following lines to the /etc/audit/audit.rules file and restarted the machine: -w /etc/group -p wa -k identity -w /etc/passwd -p wa -k identity -w /etc/gshadow -p wa -k identity -w /etc/...
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Logging SSH commands on Linux - is custom kernel the only way?

I've done some research and it looks like that the way linux keeps history is less about security and audit and more about helping the user. Even after making changes to instantly log the command and ...
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70 views

Using auditd to monitor execution of scripts

I'm trying to log execution of scripts (bash, python, perl, php) with command line params using auditd. I don't want to add execve to my config as it brings too much noise. In my audit.rules I have ...
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121 views

auditd not compressing logs during rotation

Audit is not compressing any logs. Perhaps this is a config issue. Could you perhaps tell me what's causing this in the below config? local_events = yes write_logs = yes log_file = /var/log/audit/...
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1answer
80 views

Can not log permission denied errors using auditctl [closed]

I try to create an auditctl rule for the following situation: There is a file created by root, owned by root, and with chmod 700. So no other user except root can read or write to it. When I then try ...
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By using Audit -S execve I want to log only single parent command in audit.log, not child commands

I'm Vish and I am a newbie to auditd and working on Debian version 10. My requirement is monitor the shell/bash commands executed by users and due to lack of storage space, to log only the exact ...
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2answers
54 views

Kill OS if process is killed

I have a bespoke monitoring application I'm deploying on a linux cluster I wish to secure. I would like the process not to be possible to kill. That said, senior users need root. I read that I can ...
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1answer
668 views

How to log connect/disconnects of outgoing ssh sessions?

I'm looking to log connections/disconnections from outgoing ssh sessions. Is this something auditd can do? I am able to get logs via auditbeat of the connections going outbound but the tricky part is ...
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194 views

Questions about audit

After executing the following instruction auditctl -a always, exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -F key=privileged-priv_change it returned the following error -F ...
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127 views

How to detect which process has used a file now or in the past

This is a hypothetical question, not a problem I currently have. How do you detect which process has used a file now or in the past? To find out which process is accessing filename right now, lsof ...
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1k views

Why do I get a warning for the sudoers.d when doing an audit with Lynis?

I stumbled upon Lynis - a security auditing tool for linux - and ran it on my Raspberry Pi to see if I could harden it a bit more. I got one warning in the Authentication group that confuses me. - ...
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57 views

Can substantial data theft (file access) be detected after the fact?

Suppose an employee came in to the office for a whole day over the weekend and shortly thereafter handed in their notice. Is there a way on Linux (in our case Centos 7) to eliminate the possibility ...
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1answer
158 views

ausearch: NOT operator in string match

When examining network activity logs from audit, I want to exclude a few programs I know, e.g. firefox. ausearch -x firefox -i brings up all firefox-related connections. But common NOT-operators ...
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1answer
165 views

Perform special action on bash timeout

This question is related only to bash, no ssh or any other tool. I would like to detect a bash timeout, and only a timeout: I am NOT interested in any other exit conditions (exit, EOF, ^D, or ...
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1answer
35 views

How to interpret /var/log output

I have trouble interpreting the following output from /var/log. Both lines show the same result but of different date? What does this mean? Currently doing an audit to ensure that the directories are ...
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135 views

Continuously monitoring network connections

I am looking for a network monitoring tool that can monitor all opened network connections in real-time and its output is easy to parse. What I want to achieve is auditing all in/out network ...
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1answer
128 views

How to disable sudo in containers from audit logging to host

How do I disable sudo inside of LXC containers from writing to the audit log on the host? Both the host and containers are Fedora 29. We run many containers running automated tests. Some of those ...
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1answer
661 views

Auditd, Syslog and Journald

I have been investigating about these three logging solutions auditd, syslog, and journald, but still there are thing that unclear to me. According to the things I read, auditd audits events in the ...
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1answer
52 views

How to inventory apps on Linux Desktop?

[N.B. My first post - guidance welcomed] We have a small local network of users (5) on deb-based systems and would like to maintain an index of apps installed. How can we, programmatically, ...
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523 views

why would ldconfig create a symlink to libselinux.so.1 from libext2fs.so.2?

using strace I have found a behaviour of ldconfig (glibc), I can make no sense of lstat("/usr/lib/libext2fs.so.2", {st_mode=S_IFLNK|0777, st_size=16, ...}) = 0 unlink("/usr/lib/libext2fs.so.2") ...
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96 views

How do you configure auditd logs to show up in journalctl?

I cannot find the usual auditd logs when doing "journalctl | grep msg=audit". However, I do see the auditd logs in /var/log/audit/audit.log and when doing ausearch. Is there a way to configure it so ...
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169 views

how to extracting only few records from audit.log

How to Extract audit.log While starting auditd service in linux it records all executed commands as exepected but in addition it records the background process too (the commands which is not executed ...
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2answers
1k views

Understanding the audit log - file permissions and file content changed

I need to understand the log below, my index.php got obfuscated code, and file permissions changed from 644 to 755 as well. I've got something in my audit but can't really tell what and how it ...
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1answer
983 views

Tracking all file changes in a unix host

I'm evaluating a tool and I need to identify all files (including system config files) added, changed or removed by this application (it is installed using pip). After installing on a external host, ...
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1answer
2k views

How to log failure to start/stop a service?

I want to track whether a normal user attempted to run a service. The command for starting/stopping service is given as below: service filebeat start I wrote an auditd rule like below: -w /usr/sbin/...
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Freeze Linux when log is full

Is it possible to configure a Linux server to stop all operations when it cannot create logs, similar to the security policy in Windows called "Audit: Shut down system immediately if unable to log ...
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1answer
761 views

check auditd version

Is there a better/more proper way to check auditd's version on Linux machine than to check it as part of the installed program name? For instance on Ubuntu in run /usr/bin/dpkg-query -W --showformat '...
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1answer
350 views

What is the purpose of auditctl -a never,task?

I see that whenever I start a new ec2 server the default rule for auditctl is auditctl -a never,task What is the purpose of having this rule?
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2k views

Getting error when stopping auditd

I have recently made changes to my audit.rules file on a 32bit RHEL 6.9 machine and I know that since the end of the file has -e 2 to make the file immutable a reboot is required for the new rules to ...
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1answer
209 views

Audit file modifications over ssh in Linux

I wanted to monitor all the modifications made to file in Linux server On some research I found audit tool which I have installed and configured using following commands yum install audit # ...
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1answer
635 views

Encryption of syslog & auditd in local disk? [closed]

We need to use encrypted syslog and auditd in local disk. Is it possible to save syslog and auditd message encrypted in disk ?
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2answers
33 views

servresolv.conf become blank when system is running

I use dhcpcd to manage this file. First, start dhcpcd service, and the file has something with namesever. All things can be done correctly. But this file will become blank after a while. I try ...
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1answer
51 views

How is source code reviewed/audited, prior to inclusion in linux mainline?

An answer to this question would provide insight and references about how the linux kernel source code is reviewed prior to be released? Particular interesting aspect of this question to me are: Who ...
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120 views

AIX auditpr timestamp format

Is there a way to customize the timestamp format that the auditpr command on AIX generates? I am logging to binary, and when I use auditpr to read the binary audit logs, I get something similar to : ...
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328 views

Why ausearch does not find matches for SYSTEM_BOOT and SYSTEM_SHUTDOWN?

I ask myself why I get no matches when I search for SYSTEM_BOOT or SYSTEM_SHUTDOWN. ausearch -m SYSTEM_BOOT ausearch -m SYSTEM_SHUTDOWN To be sure that events are not getting lost during booting I ...
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1answer
664 views

What is the Windows equivalent of 'Audit log cleared' event in Unix/Linux?

Windows has EventID 1102 "The audit log was cleared". What is the equivalent audit event in Unix/Linux? If someone has a sample event, and know what audit policy needs to be configured to get this ...
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1answer
820 views

How to decode audit logs

I'm auditing the files in a nfs share. When I look at the audit logs using the command ausearch -f /var/nfs/general , I get some logs that looks like this: time->Tue Jun 12 16:23:34 2018 type=...
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1answer
965 views

Difference between Failed Authentications and Failed Logins in aureport [closed]

Lately I've been exploring the aureport tool, but I've noticed the following in the outputs and behavior of it. For example, running the following command: # aureport --failed Displays the ...
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1answer
124 views

aureport -l doesnt show the sucessful count of the user who used “su” command

why the command aureport -l --success --summary -i does show the successful login count of the user who used su command. The output the above said command only calculates sshd, gdm sessions but not ...
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1answer
273 views

How to install audit2allow on Alpine Linux 3.5?

I am coming from an apt-get background and am now trying (and failing) to use Alpine Linux's apk utility for package management. I try running apk install audit2allow and end up with a help message ...
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1answer
84 views

Fastest way to locate any files/dirs with different ACLs than parent? (FreeBSD)

As the question says. I have a data pool with ~ 10M files with access controlled by NFSv4 ACLs. It's usable from CLI, Samba, sometimes by daemon processes or rsync, and for some dirs by ftp/sftp, so ...
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1answer
180 views

Logger -f command killed opening /var/log/messages in tail

I'm trying to run this command on CentOS. logger -t AUDIT_LOG -f <MY_AUDIT_LOG_FILE> & It works correctly for 10/20 seconds. Opening /var/log/messages in tail I can correctly see messages ...
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99 views

Shell command audit for a single user

What is the easiest way to log all the commands ran in the all different shells (bash, zsh...) by a certain user to a file, syslog or somewhere else?
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31 views

Is there a way to log attempts to change a file in RHEL6?

We have a RHEL6 server that was built using an old homegrown build platform. The team that built the platform was disbanded, and all members have moved on. So, we are trying to figure out everything ...