From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 9024CC0782 for ; Thu, 11 Jan 2024 11:52:03 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 6A28DF99B for ; Thu, 11 Jan 2024 11:51:33 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS for ; Thu, 11 Jan 2024 11:51:32 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id AF7F4490A4 for ; Thu, 11 Jan 2024 11:51:32 +0100 (CET) From: =?UTF-8?q?Fabian=20Gr=C3=BCnbichler?= To: pve-devel@lists.proxmox.com Date: Thu, 11 Jan 2024 11:51:15 +0100 Message-Id: <20240111105123.370028-2-f.gruenbichler@proxmox.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240111105123.370028-1-f.gruenbichler@proxmox.com> References: <20240111105123.370028-1-f.gruenbichler@proxmox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.065 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record T_SCC_BODY_TEXT_LINE -0.01 - Subject: [pve-devel] [PATCH cluster 1/4] fix #4886: write node SSH hostkey to pmxcfs X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Jan 2024 10:52:03 -0000 so that we can explicitly pin just this key when doing intra-cluster SSH connections. this works similar to the certificate cache we use for API proxying, but without automatic invalidation, since node A doesn't have access to node B's host key.. Signed-off-by: Fabian Grünbichler --- Notes: we could store more than just the RSA one there, but that would have some potential for fallout.. the filename could also be changed to reflect what it contains, not what is used for - e.g., "ssh_host_keys" src/PVE/Cluster/Setup.pm | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/PVE/Cluster/Setup.pm b/src/PVE/Cluster/Setup.pm index 07020d7..4b6f013 100644 --- a/src/PVE/Cluster/Setup.pm +++ b/src/PVE/Cluster/Setup.pm @@ -220,6 +220,20 @@ sub ssh_unmerge_known_hosts { PVE::Tools::file_set_contents($ssh_system_known_hosts, $old); } +sub ssh_create_node_known_hosts { + my ($nodename) = @_; + + my $hostkey = PVE::Tools::file_get_contents($ssh_host_rsa_id); + # Note: file sometimes containe empty lines at start, so we use multiline match + die "can't parse $ssh_host_rsa_id" if $hostkey !~ m/^(ssh-rsa\s\S+)(\s.*)?$/m; + $hostkey = $1; + + my $raw = "$nodename $hostkey"; + PVE::Tools::file_set_contents("/etc/pve/nodes/$nodename/ssh_known_hosts", $raw); + + # TODO: also setup custom keypair and client config here to disentangle entirely from /root/.ssh? +} + sub ssh_merge_known_hosts { my ($nodename, $ip_address, $createLink) = @_; @@ -823,6 +837,7 @@ sub updatecerts_and_ssh { $p->("merge authorized SSH keys and known hosts"); ssh_merge_keys(); ssh_merge_known_hosts($nodename, $local_ip_address, 1); + ssh_create_node_known_hosts($nodename); gen_pve_vzdump_files(); } -- 2.39.2