similar to: [Bug 2671] New: make possible to remove default ciphers/kexalgorithms/mac algorithms

On 05/01/2017 04:48 PM, Cristian Ionescu-Idbohrn wrote: > On Mon, 1 May 2017, Cristian Ionescu-Idbohrn wrote: >> >> Example, 'Macs'. >> >> On the man page I read: >> >> "Multiple algorithms must be comma-separated. >> ... >> If the specified value begins with a '-' character, then the >> specified algorithms (including

On Tue, May 02, 2017 at 06:17:47PM +0200, Cristian Ionescu-Idbohrn wrote: > $ ssh -vvv -oMacs=umac-64 at openssh.com localhost : 2>&1 | egrep -i 'macs|umac' > debug2: MACs ctos: umac-64 at openssh.com > debug2: MACs stoc: umac-64 at openssh.com > debug2: MACs ctos: umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm

https://bugzilla.mindrot.org/show_bug.cgi?id=2715 Bug ID: 2715 Summary: for more flexibility, please support a comma ',' separated list of patterns to add to/remove from the defaults Product: Portable OpenSSH Version: 7.5p1 Hardware: Other OS: Linux Status: NEW

On Thu, 14 Apr 2016, Jakub Jelen wrote: > On 04/14/2016 01:19 PM, Cristian Ionescu-Idbohrn wrote: > > There is no /root/.ssh/authorized_keys on remote host, so I have to > > authenticate with password. > > > > On the remote host: > > > > # /usr/sbin/sshd -T | egrep permitroot > > permitrootlogin yes > > > > Attempting: > > > >

Hi all, this is a patch to make Ciphers, MACs and KexAlgorithms available in Match blocks. Now I can reach a -current machine with some Android terminal app without changing the default ciphers for all clients: Match Address 192.168.1.2 Ciphers aes128-cbc MACs hmac-sha1 KexAlgorithms diffie-hellman-group-exchange-sha1 Index: servconf.c

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:

Example, 'Macs'. On the man page I read: "Multiple algorithms must be comma-separated. ... If the specified value begins with a '-' character, then the specified algorithms (including wildcards) will be removed" It seems that just one algo name is supported on such a line, example: Macs -umac-64* But this form is not supported: Macs -umac-64*,-hmac-sha1* nor is

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

Package: logcheck Version: 1.3.14 Severity: normal Tags: patch I keep getting these messages logged, when under high load. This patch should clean that up. commit 72661acccafa519fcb48a6a756e5c35d96e7511d Author: Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn at axis.com> Date: Fri Jan 27 16:08:33 2012 +0100 Workaround for error: /usr/sbin/logcheck: line 100: kill: (31667)

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

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

There is no /root/.ssh/authorized_keys on remote host, so I have to authenticate with password. On the remote host: # /usr/sbin/sshd -T | egrep permitroot permitrootlogin yes Attempting: $ ssh root@<remotehost> shows: Received disconnect from <remotehost> port 22:2: Too many authentication failures for root packet_write_wait: Connection to <remotehost> port 22: Broken

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

`git describe' says V_7_3_P1-207-gc924b2ef (shouldn't it say V_7_4_P1-<yadayada>?). This is what I see: gcc -g -O2 -Wall -Wpointer-arith -Wuninitialized -Wsign-compare -Wformat-security -Wsizeof-pointer-memaccess -Wno-pointer-sign -Wno-unused-result -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -ftrapv -fno-builtin-memset -fstack-protector-strong -fPIE -I. -I.

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

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,

Am 19.10.2016 um 00:58 schrieb Gordon Messmer <gordon.messmer at gmail.com>: > On 10/18/2016 03:28 PM, Clint Dilks wrote: >> So first >> question is are people generally modifying the list of ciphers supported by >> the ssh client and sshd? > > I suspect that "generally" people are not. I do, because I can, and so that I can offer at least some advice

Once upon a time, Erik Laxdal <elaxdal at ece.uvic.ca> said: > The supported KexAlgorithms, Ciphers, and MACs are generally listed > in the sshd_config man page. So 'man sshd_config' then look for the > section of the item of interest. Note that the man page does not always match the actual compiled binary (the build process does not update the man page to match

On 10/18/2016 03:28 PM, Clint Dilks wrote: > So first > question is are people generally modifying the list of ciphers supported by > the ssh client and sshd? I suspect that "generally" people are not. I do, because I can, and so that I can offer at least some advice to people who aim to do so. > On CentOS 6 currently it looks like if I remove all the ciphers they are

On 2016-10-19 03:11, Leon Fauster wrote: > Is there any command to find the supported list of KeyAlgos, MACs and > Ciphers for > the particular system (e.g. EL{5,6,7})? Similar to $ openssl ciphers > -v ... The supported KexAlgorithms, Ciphers, and MACs are generally listed in the sshd_config man page. So 'man sshd_config' then look for the section of the item of