similar to: Key exchange

A few questions regarding the OpenSSH support for the Diffie Hellman key exchange algorithms: (1) Are the diffie-hellman-group-exchange-sha256", "diffie-hellman-group-exchange-sha1" , "diffie-hellman-group14-sha1" "diffie-hellman-group1-sha1" (as defined in RFCs 4253 and RFC 4419) the complete list of key exchange algorithms supported by OpenSSH? (2) Is there a

Hello, I have some users that connect to a server with their DSA key that is of type ssh-dss. I'm migrating (installing as new) the server where they connect to CentOS 8 + updates. I was not able to connect with the keys to this new server even after having added, as found in several internet pages, this directive at the end of /etc/ssh/sshd_config of the CentOS 8 server: # Accept also DSA

Can we disable diffie-hellman-group14-sha1 too? On Thu, Feb 14, 2019 at 10:23 PM Mark D. Baushke <mdb at juniper.net> wrote: > > Hi John, > > The short answer is YES. > > Jon DeVree <nuxi at vault24.org> writes: > > > I ask because the removal of diffie-hellman-group-exchange-sha1 happened > > accidently in 7.8 due to a mistake in a change to

I ask because the removal of diffie-hellman-group-exchange-sha1 happened accidently in 7.8 due to a mistake in a change to readconf.c. I noticed this and filed a bug about it along with a patch to fix readconf.c to use KEX_CLIENT_* like it used to: https://github.com/openssh/openssh-portable/commit/1b9dd4aa https://bugzilla.mindrot.org/show_bug.cgi?id=2967 Its clear the removal was unintentional

This is debugs seen on server, whose keys are not accepted by the client: debug1: Seeding random number generator debug1: sshd version OpenSSH_2.5.2p2 debug1: load_private_key_autodetect: type 0 RSA1 debug1: read SSH2 private key done: name rsa w/o comment success 1 debug1: load_private_key_autodetect: type 1 RSA debug1: read SSH2 private key done: name dsa w/o comment success 1 debug1:

Hello all, It seems the overhaul on key exchange/selection broke it badly. I haven't managed to use any other encryption method than 3des and blowfish when connecting to SNAP -> SNAP. SNAP -> 2.2.0p1 will use arcfour etc. quite cleanly. How SNAP -> SNAP looks like: --- debug: Local version string SSH-2.0-OpenSSH_2.2.0p2 debug: send KEXINIT debug: done debug: wait KEXINIT debug:

On 09/22/2017 06:55 PM, Tim Broberg wrote: > Do I understand correctly, that you find the security of group 14 unacceptable and yet you left it enabled? In the end, I'm trying to ensure a minimum equivalent of 128-bits of security. Group14 is 2048-bits, which roughly translates to 112-bits. [1] To this end, I disabled the "diffie-hellman-group14-sha1" and

Also, how are default moduli shipped with OpenSSH for use in diffie-hellman-group-exchange-sha1/sha256 chosen? Are they chosen randomly by developers or are they chosen for security properties? If they are random, why not use moduli from RFC 7919 instead, like Mozilla recommends? On Fri, Feb 15, 2019 at 3:48 AM Mark D. Baushke <mdb at juniper.net> wrote: > > Yegor Ievlev <koops1997

Hello all, I have recently had cause to dig a little into the specifics of how diffie-hellman-group-exchange-sha256 group sizes work. The belief in the wild, perpetuated by multiple sources of logjam mediation papers and also Andras Stribnik's very influential piece "Secure Secure Shell", is that server operators can force the use of a minimum group size by removing moduli

Hi List, Happy New Years and I was hoping to get some help on an ssh issue that I am having. For some reason I am unable to scp to hosts on this network using RSA keys. Here is what I am doing/what is going on; scp the public key to remote host [amandabackup at VIRTCENT18 ~]$ scp ~/.ssh/id_rsa_amdump.pub amandabackup at lb1:~ amandabackup at lb1's password: id_rsa_amdump.pub

On Fri, May 22, 2015 at 12:27:01, Darren Tucker <dtucker at zip.com.au> wrote: > Note that PuTTY does do Diffie-Hellman Group Exchange, but until very > recently (ie after their 0.64 release) they didn't do the one that was > actually standardized in RFC4419. OpenSSH recently removed support for > that non-standard one and as a result we don't offer DHGEX to PuTTY >

Il giorno gio 22 nov 2018 alle ore 21:24 Stuart Henderson <stu at spacehopper.org> ha scritto: > > On 2018/11/22 19:55, owl700 at gmail.com wrote: > > Hi, I have compatibility issues with the latest version of > > openssh-server and an old dropbear client, the dopbear client stops at > > preauth > > > > ov 22 14:34:03 myhostname sshd[3905]: debug1: Client

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

Hello, On Sun, Sep 22, 2024 at 10:15?AM Kurt Fitzner via openssh-unix-dev <openssh-unix-dev at mindrot.org> wrote: > > I would like to advocate for: > > - Change behaviour of the server to allow server operators to set the > minimum modulus group size allowable for a connection using > diffie-hellman-group-exchange-sha256 > Whether this is by having the server refuse

Darren Tucker <dtucker at zip.com.au> writes: > On Tue, Nov 8, 2016 at 2:43 PM, Harry Putnam <reader at newsguy.com> wrote: >> Darren Tucker <dtucker at zip.com.au> writes: >> >>> On Tue, Nov 8, 2016 at 1:02 PM, Harry Putnam <reader at newsguy.com> wrote: >>> [...] >>>> gv harry> ssh -vv 2x >>>> >>>>

Trying to connect to a Dell iDRAC 6. The iDRAC reports it is running OpenSSH 5.2. From Fedora Linux 20 with OpenSSH 6.4p1, connections succeed. From Fedora Linux 23 with OpenSSH 7.2p2, connections succeed. From Fedora Linux 27 with OpenSSH 7.6p1, connections fail prior to prompting for a password. The message is, "Received disconnect from (IP address) port 22:11: Logged out." Trying

Hello, I got some weird problem with public key authentication using rsa key pair. Let me first of all explain my setup. 1) I got two Solaris 8 x86 boxes uname -a SunOS 5.8 Generic_117351-24 i86pc i386 i86pc <kdc: 192.168.10.11> <---> <module: 192.168.10.10> 2) They're running absolutely identical openssh installations I'm using pkgsrc, so I've builded all

Hello, I'd like to inform you that the next release of WinSCP SFTP client (version 5.7.5) will support Diffie-Hellman group exchange as specified by RFC 4419. http://winscp.net/tracker/show_bug.cgi?id=1345 So I'd like to ask you to kindly update the check in compat_datafellows() to WinSCP_release_4* WinSCP_release_5.0* WinSCP_release_5.1* WinSCP_release_5.2* WinSCP_release_5.5*

Here you go: OpenSSH_7.9p1, OpenSSL 1.1.1d 10 Sep 2019 debug1: Reading configuration data /home/ryantm/.ssh/config debug1: /home/ryantm/.ssh/config line 4: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 13: Applying options for * debug2: resolving "{REDACTED}" port 22 debug2: ssh_connect_direct debug1: Connecting to

Hello, I'm looking for your insight about the log below. We have an SFTP server (IBM Sterling File Gateway) and we're connecting from an OpenSSH SFTP client but something fails during KEX. Complete client-side debug output is below, but I believe the relevant part is: debug1: kex: server->client cipher: aes192-cbc MAC: hmac-sha1 compression: none debug1: kex: client->server