similar to: Minimize sshd log clutter/spam from unauthenticated connections

For what it's worth to those who want to play with SPA, here is a demo i whipped up. It is very easy to set up, and i almost guarantee anyone can get this running. What we will demonstrate: Bascially: An SPA demo. Requirements: Very little - a minimal setup of centos. This setup will demonstrate a client who initially cannot connect to a an ssh port on the server (the server is DROPing

I've seen pam_shield recommended several times for protecting against malicious login attempts; but I'm not quite clear if this requires one to be already running some pam-based software? Also, I'm running shorewall, and would prefer a shorewall based protection, but the advice I read on googling for this seemed excessively complicated. -- Timothy Murphy e-mail: gayleard /at/

Jochen Bern <Jochen.Bern at binect.de> writes: > (And since you mention "port knocking", I'd like to repeat how fond I > am of upgrading that original concept to a single-packet > crypto-armored implementation like fwknop.) I am reluctantly considering to use some kind of port knocking mechanism on some machines, however I really don't want to carry around shared

On 04.07.24 01:41, Manon Goo wrote: > - some users private keys are lost Then you go and remove the corresponding pubkeys from wherever they're configured. Seriously, even if you do not scan which pubkey is configured where *now* (as is part of our usual monitoring), it'll be your "number <3" task *then* to go hunt it down. > And you want to lock down the sshd

Simon Josefsson wrote in <87jzi1fg24.fsf at kaka.sjd.se>: |Jochen Bern <Jochen.Bern at binect.de> writes: |> (And since you mention "port knocking", I'd like to repeat how fond I |> am of upgrading that original concept to a single-packet |> crypto-armored implementation like fwknop.) | |I am reluctantly considering to use some kind of port knocking

https://bugzilla.netfilter.org/show_bug.cgi?id=1482 Bug ID: 1482 Summary: adjacent /31 IPs in ipset Product: nftables Version: unspecified Hardware: x86_64 OS: other Status: NEW Severity: normal Priority: P5 Component: kernel Assignee: pablo at netfilter.org

And if you're really security conscious consider using port knocking (knock server - amazingly easy to set up. Or use fwknop, a little more difficult to set up but not much. Finally, for the hard core who really like pain - write the iptables rules yourself). ----- Original Message ----- From: "Pete Biggs" <pete at biggs.org.uk> To: "centos" <centos at

Steffen Nurpmeso wrote in <20240704180538.iV4uex29 at steffen%sdaoden.eu>: |Simon Josefsson wrote in | <87jzi1fg24.fsf at kaka.sjd.se>: ||Jochen Bern <Jochen.Bern at binect.de> writes: ||> (And since you mention "port knocking", I'd like to repeat how fond I ||> am of upgrading that original concept to a single-packet ||> crypto-armored

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> On 18 May 2018, at 20.19, David Hubbard <dhubbard at dino.hostasaurus.com> wrote: > > Hello, given the 2015 revision date, I was curious if anyone can confirm https://wiki2.dovecot.org/Timeouts is still accurate where the 'before login' IMAP timeout remains hard coded? > > We're having an issue where blocks of IP's from China and similar locations are

Hi, I've configured my samba server as a PDC and joint some windowsXP clients to it. So far so good. However I'm able to login into windows even when the domain controller refuses to authenticate the user. The user is not able to access the shares but can use the local machine. How can I prevent windows to login the user locally when the domain controller refuses authentication? thankz,

To radically cut down on SSH log spam you can also hide it completely behind a firewall, and allow access only by some port knocking sequence. I quite like having a process listen on port 53 and wait for a dns query containing a totp string to grant (temporary) access; that's a 2fa, and doing a "host 123456. my-ip" is easily automated in a shell script as well...

Asterisk Project Security Advisory - AST-2008-003 +------------------------------------------------------------------------+ | Product | Asterisk | |--------------------+---------------------------------------------------| | Summary | Unauthenticated calls allowed from SIP channel | | | driver

Asterisk Project Security Advisory - AST-2008-003 +------------------------------------------------------------------------+ | Product | Asterisk | |--------------------+---------------------------------------------------| | Summary | Unauthenticated calls allowed from SIP channel | | | driver

I am seeing a recent increase in SSH harvesting attempts and brute forcing in the log of my system. I'm interested in opening up some discussion around what OpenSSH can do itself to counter measure against: * DoS attack where too many unauthenticated connections are open. I'm not interested in stopping the professional saboteur but the casual script kiddie (to use IRC terms) from

I guess you might find fail2ban useful. It scans logfiles (like /var/log/sshd.log), and when it sees too many authentication failures from an IP address (or network range) it can issue commands to drop any further attempts via a firewall. By having it read its own logfile it's possible to have repeated offenders be cut out for longer and longer time spans.

Hello, given the 2015 revision date, I was curious if anyone can confirm https://wiki2.dovecot.org/Timeouts is still accurate where the 'before login' IMAP timeout remains hard coded? We're having an issue where blocks of IP's from China and similar locations are crawling IP ranges trying common login credentials, and hanging the connections open in the process. We have clients

Hi list, i noticed from the cli my asterisk box is accepting unauthenticated calls how can i prevent this? CLI: -- Accepting UNAUTHENTICATED call from 192.168.0.2: > requested format = gsm, > requested prefs = (), > actual format = ulaw, > host prefs = (g729|ulaw|alaw), > priority = mine -------------- next part -------------- An HTML

modern syslog daemons (including rsyslog, which is default on just about every linux system) allow you to filter efficiently on the message contents, not just the severity, so you can opt to throw out the messages you don't want. I advocate for a slightly different way of dealing with it, filter these messages from your main logstream, but put them into either a script directly, or a

On 18.03.23 14:34, David Lang wrote: > modern syslog daemons (including rsyslog, which is default on just > about every linux system) allow you to filter efficiently on the > message contents, not just the severity, so you can opt to throw out > the messages you don't want. > > I advocate for a slightly different way of dealing with it, filter > these messages from