similar to: Patch: Ciphers, MACs and KexAlgorithms on Match

This patch allows the OpenSSH client to make connections over SCTP, and allows the OpenSSH server to listen for connections over SCTP. SCTP is a robust transport-layer protocol which supports, amongst other things, the changing of endpoint IPs without breaking the connection. To connect via SCTP, pass -H or set "ConnectViaSCTP yes". To listen via SCTP as well as TCP, set

Hey everyone, I wanted to add support for denying PTY allocation through OpenSSH. I'm not certain if this is quite thorough enough for all cases, but for me it might work for the moment. I know that you can currently do this through authorized_keys, but as far as I know that only works for an actual key. In my use case, I wanted a user with no password which is forced to run a specific

When forwarding a Unix-domain socket, the remote socket path must be absolute (otherwise the forwarding fails later). However, guessing absolute path on the remote end is sometimes not straightforward, because the file system location may vary for many reasons, including the system installation, the choices of NFS mount points, or the remote user ID. To allow ssh clients to request remote socket

https://bugzilla.mindrot.org/show_bug.cgi?id=2333 Bug ID: 2333 Summary: forbid old Ciphers, KexAlgorithms and MACs by default Product: Portable OpenSSH Version: 6.6p1 Hardware: Other OS: Linux Status: NEW Severity: enhancement Priority: P5 Component: Miscellaneous Assignee:

Hi, I am running the below servers on Red Hat Enterprise Linux release 8.7 (Ootpa). The details are as follows. # rpm -qa | grep openssh openssh-8.0p1-16.el8.x86_64 openssh-askpass-8.0p1-16.el8.x86_64 openssh-server-8.0p1-16.el8.x86_64 openssh-clients-8.0p1-16.el8.x86_64 # cat /etc/redhat-release Red Hat Enterprise Linux release 8.7 (Ootpa) # How do I enable strong KexAlgorithms, Ciphers and

Hello, I manage OpenSSH on a dozen or so servers that act as gateways for a large amount of developers and system administrators. On these servers it is common for there to be more than 1000 active X11 forwards active at peak usage. Beyond ~1000 active X11 forwards, sshd will fail to bind additional ports due to a hard coded range check in channels.c that limits the port range that sshd will

Hi Kaushal, I maintain a set of SSH hardening guides for various platforms, including RHEL 8. You can find them here: https://ssh-audit.com/hardening_guides.html - Joe -- Joseph S. Testa II Founder & Principal Security Consultant Positron Security On Thu, 2024-01-25 at 18:39 +0530, Kaushal Shriyan wrote: > Hi, > > I am running the below servers on Red Hat Enterprise

https://bugzilla.mindrot.org/show_bug.cgi?id=3184 Bug ID: 3184 Summary: Unable to add deprecated KexAlgorithms back for host via config file Product: Portable OpenSSH Version: 8.2p1 Hardware: All OS: All Status: NEW Severity: major Priority: P5 Component: ssh

https://bugzilla.mindrot.org/show_bug.cgi?id=2671 Bug ID: 2671 Summary: make possible to remove default ciphers/kexalgorithms/mac algorithms Product: Portable OpenSSH Version: 7.4p1 Hardware: Other OS: Linux Status: NEW Severity: enhancement Priority: P5 Component:

BTW based on your output it looks like the DEFAULT policy is just fine, If you really want to turn etm HMAC and chacha20 off, you should follow the RHEL security alert https://access.redhat.com/security/cve/cve-2023-48795 cipher at SSH = -CHACHA20-POLY1305 ssh_etm = 0 by putting these lines into `/etc/crypto-policies/policies/modules/CVE-2023-48795.pmod`, applying the resulting subpolicy

Hello everybody, I'm a C/C++ consultant working for Ericsson. I changed the OpenSSH-Portable code to add a new criteria into the Match sshd_config option read by the sshd server. The new criteria is "Subsystem"; so a conditional block based on subsystem client request can now be added to the sshd_config configuration server file to override settings in its global section.

https://bugzilla.mindrot.org/show_bug.cgi?id=983 Damien Miller <djm at mindrot.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |1930 --- Comment #34 from Damien Miller <djm at mindrot.org> 2011-09-06 10:34:24 EST --- Retarget unresolved

Hi, So I screwed up when writing the support for the curve25519 KEX method that doesn't depend on OpenSSL's BIGNUM type - a bug in my code left leading zero bytes where they should have been skipped. The impact of this is that OpenSSH 6.5 and 6.6 will fail during key exchange with a peer that implements curve25519-sha256 at libssh.org properly about 0.2% of the time (one in every 512ish

On Tue, 3 May 2016, Rogan Dawes wrote: > Hi Damien, > Thanks for the response! > > I tried moving the StreamLocalBindUnlink directive outside of the Match > rule, and it worked. But that doesn't explain why the Match was not > correctly setting the directive: > > This is running on an alternate port with -ddd: > > debug3: checking match for 'User

I was wondering what everyone's thoughts were on a simpler way to exclude addresses from having listeners on them. I know a lot of people have multiple subnets, especially larger corporations. Some networks are non-route-able, and therefor unsuitable for use with SSH, aside from communication between other servers on the same subnet. Given that we may want to exclude those non-route-able

On 25.01.24 14:09, Kaushal Shriyan wrote: > I am running the below servers on Red Hat Enterprise Linux release 8.7 > How do I enable strong KexAlgorithms, Ciphers and MACs On RHEL 8, you need to be aware that there are "crypto policies" modifying sshd's behaviour, and it would likely be the *preferred* method to inject your intended config changes *there* (unless they

On Fri, Jan 26, 2024 at 7:24?PM Jochen Bern <Jochen.Bern at binect.de> wrote: > On 25.01.24 14:09, Kaushal Shriyan wrote: > > I am running the below servers on Red Hat Enterprise Linux release 8.7 > > How do I enable strong KexAlgorithms, Ciphers and MACs > > On RHEL 8, you need to be aware that there are "crypto policies" > modifying sshd's behaviour,

Hello, We'd like to allow passwords only from the local network, and allow public key auth from on-campus or off-campus. The server runs SuSE Linux, and we might do the same on RHEL/CentOS & Mac OS X if we can get it to work. Unfortunately, Match allows PasswordAuthentication but not ChallengeResponseAuthentication. Is there any reason ChallengeResponseAuthentication cannot be

Darren Tucker <dtucker at zip.com.au> writes: > On Tue, Nov 8, 2016 at 3:30 PM, Harry Putnam <reader at newsguy.com> wrote: > [...] >> After having 7.3p1 & 6.8p1 fail with same wording... I tried 6.7p1 and >> find it fails with what looks like the same problem but has slightly >> different wording. > > I set up the same versions (server:OpenSSH_6.6p1,

Hello, Would it be possible to add generic engine support to OpenSSH? One use in particular would be to support TCP forwarding for secure mail server connections and similar applications. This would permit an administrator to configure in an arbitrary external engine to establish a secure RSA-based tunnel. OpenSSH would need no information built into it to accomodate any particular engine. One