Date: Thu, 14 Apr 2016 11:44:21 +0200 From: "Patrick M. Hausen" <hausen@punkt.de> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: OpenSSH changes between 10.2 and 10.3 ... Message-ID: <2DD338AE-8DF8-4E59-AE3F-11DF704E455A@punkt.de>
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Hi, all, minor problem/annoyance here: root@noc:/etc/ssh # ssh admin@10.4.0.62 Unable to negotiate with 10.4.0.62 port 22: no matching key exchange = method found. Their offer: diffie-hellman-group1-sha1,none root@noc:/etc/ssh # uname -a FreeBSD noc.pluspunkthosting.de 10.3-RELEASE FreeBSD 10.3-RELEASE #3: = Wed Apr 13 14:46:57 CEST 2016 = root@noc.pluspunkthosting.de:/usr/obj/usr/src/sys/GENERIC amd64 Of course I was able to find http://www.openssh.com/legacy.html myself. FreeBSD 10.2 uses OpenSSH 6.6.x while 10.3 imported 7.2. So far so good. The recommended method from the document above works on the command line: ssh -oKexAlgorithms=3D+diffie-hellman-group1-sha1 = admin@10.4.0.62 But if I add KexAlgorithms +diffie-hellman-group1-sha1 to /etc/ssh/ssh_config, that does not change anything. Oddly enough, checking which algorithms are supported gives the same result regardless of any configuration options: root@noc:/etc/ssh # ssh -Q kex diffie-hellman-group1-sha1 diffie-hellman-group14-sha1 diffie-hellman-group-exchange-sha1 diffie-hellman-group-exchange-sha256 ecdh-sha2-nistp256 ecdh-sha2-nistp384 ecdh-sha2-nistp521 curve25519-sha256@libssh.org So, diffie-hellman-group1-sha1 is supported but not used unless specified on the command line? And there is no way to override that *globally*? This is an isolated management network with IPMI interfaces - we won't be getting updates for all of these machines' IPMI firmware ... Am I stuck with writing shell aliases or putting the config in each and every user's private ~/.ssh/config? Thanks for any hints, Patrick --=20 punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info@punkt.de http://www.punkt.de Gf: J=C3=BCrgen Egeling AG Mannheim 108285
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