Remove sha1 based kex algorithms
This patch hardened server configuration including removing sha1 based kex algorithms from the manifest template that puppet uses to generate the configuration file sshd_config. It also removed hardcoded sshd_config and ssh_config from repo, replaced them with patches to openssh that harden both server and client configuration. This is particularly to address the requirements that the system should be hardened from the very first boot up (before it is configured by manifest apply) It also removed old obsolete patch files in openssh directory to avoid confusions. Change-Id: I293d233c0ed12fef0c1d180cf357100d4aabc2ed Signed-off-by: Andy Ning <andy.ning@windriver.com>
This commit is contained in:
Andy Ning
Jack Ding
parent
5a9fcd20e1
commit
62ed634825
@ -1,2 +1 @@
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COPY_LIST="$FILES_BASE/*"
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TIS_PATCH_VER=8
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TIS_PATCH_VER=9
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@ -1,48 +0,0 @@
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# $OpenBSD: ssh_config,v 1.25 2009/02/17 01:28:32 djm Exp $
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# This is the ssh client system-wide configuration file. See
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# ssh_config(5) for more information. This file provides defaults for
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# users, and the values can be changed in per-user configuration files
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# or on the command line.
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# Configuration data is parsed as follows:
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# 1. command line options
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# 2. user-specific file
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# 3. system-wide file
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# Any configuration value is only changed the first time it is set.
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# Thus, host-specific definitions should be at the beginning of the
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# configuration file, and defaults at the end.
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# Site-wide defaults for some commonly used options. For a comprehensive
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# list of available options, their meanings and defaults, please see the
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# ssh_config(5) man page.
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Host *
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ForwardAgent yes
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ForwardX11 yes
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# RhostsRSAAuthentication no
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# RSAAuthentication yes
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# PasswordAuthentication yes
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# HostbasedAuthentication no
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# GSSAPIAuthentication no
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# GSSAPIDelegateCredentials no
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# BatchMode no
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# CheckHostIP yes
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# AddressFamily any
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# ConnectTimeout 0
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# StrictHostKeyChecking ask
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# IdentityFile ~/.ssh/identity
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# IdentityFile ~/.ssh/id_rsa
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# IdentityFile ~/.ssh/id_dsa
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# Port 22
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# Protocol 2,1
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# Cipher 3des
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# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
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# MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160
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# EscapeChar ~
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# Tunnel no
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# TunnelDevice any:any
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# PermitLocalCommand no
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# VisualHostKey no
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KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
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UseRoaming no
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@ -1,129 +0,0 @@
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# $OpenBSD: sshd_config,v 1.80 2008/07/02 02:24:18 djm Exp $
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# This is the sshd server system-wide configuration file. See
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# sshd_config(5) for more information.
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# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
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# The strategy used for options in the default sshd_config shipped with
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# OpenSSH is to specify options with their default value where
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# possible, but leave them commented. Uncommented options change a
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# default value.
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#Port 22
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#AddressFamily any
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#ListenAddress 0.0.0.0
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#ListenAddress ::
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# Disable legacy (protocol version 1) support in the server for new
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# installations. In future the default will change to require explicit
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# activation of protocol 1
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Protocol 2
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# HostKey for protocol version 1
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#HostKey /etc/ssh/ssh_host_key
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# HostKeys for protocol version 2
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HostKey /etc/ssh/ssh_host_ed25519_key
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HostKey /etc/ssh/ssh_host_rsa_key
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HostKey /etc/ssh/ssh_host_ecdsa_key
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# Lifetime and size of ephemeral version 1 server key
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#KeyRegenerationInterval 1h
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#ServerKeyBits 1024
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# Logging
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# obsoletes QuietMode and FascistLogging
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#SyslogFacility AUTH
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LogLevel INFO
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# Authentication:
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LoginGraceTime 1m
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PermitRootLogin without-password
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#StrictModes yes
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MaxAuthTries 4
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#MaxSessions 10
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#RSAAuthentication yes
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#PubkeyAuthentication yes
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#AuthorizedKeysFile .ssh/authorized_keys
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# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
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#RhostsRSAAuthentication no
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# similar for protocol version 2
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#HostbasedAuthentication no
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# Change to yes if you don't trust ~/.ssh/known_hosts for
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# RhostsRSAAuthentication and HostbasedAuthentication
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#IgnoreUserKnownHosts no
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# Don't read the user's ~/.rhosts and ~/.shosts files
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#IgnoreRhosts yes
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# To disable tunneled clear text passwords, change to no here!
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#PasswordAuthentication yes
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PermitEmptyPasswords no
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# Change to no to disable s/key passwords
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ChallengeResponseAuthentication no
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# Kerberos options
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#KerberosAuthentication no
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#KerberosOrLocalPasswd yes
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#KerberosTicketCleanup yes
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#KerberosGetAFSToken no
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# GSSAPI options
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#GSSAPIAuthentication no
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#GSSAPICleanupCredentials yes
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# Set this to 'yes' to enable PAM authentication, account processing,
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# and session processing. If this is enabled, PAM authentication will
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# be allowed through the ChallengeResponseAuthentication and
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# PasswordAuthentication. Depending on your PAM configuration,
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# PAM authentication via ChallengeResponseAuthentication may bypass
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# the setting of "PermitRootLogin without-password".
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# If you just want the PAM account and session checks to run without
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# PAM authentication, then enable this but set PasswordAuthentication
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# and ChallengeResponseAuthentication to 'no'.
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UsePAM yes
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AllowAgentForwarding no
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AllowTcpForwarding no
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#GatewayPorts no
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X11Forwarding no
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#X11DisplayOffset 10
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#X11UseLocalhost yes
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#PrintMotd yes
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#PrintLastLog yes
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#TCPKeepAlive yes
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#UseLogin no
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UsePrivilegeSeparation yes
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PermitUserEnvironment no
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Compression no
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ClientAliveInterval 15
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ClientAliveCountMax 4
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# Make SSH connect faster on bootup
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UseDNS no
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#PidFile /var/run/sshd.pid
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#MaxStartups 10
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#PermitTunnel no
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#ChrootDirectory none
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# default banner path
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Banner /etc/issue.net
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# override default of no subsystems
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Subsystem sftp /usr/libexec/openssh/sftp-server
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# Example of overriding settings on a per-user basis
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#Match User anoncvs
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# X11Forwarding no
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# AllowTcpForwarding no
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# ForceCommand cvs server
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DenyUsers admin secadmin operator
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# Filtered cipher, MAC and key exchange algorithm list, defaults can be
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# obtained by ssh -Q cipher, ssh -Q mac and ssh -Q kex
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# TODO (aning): once openssh is updated to 7.5, an explicit exclusion list
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# using "-" should be used for cipher, MAC and kex excluded suites.
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Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
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MACs hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com
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KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
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@ -5,3 +5,5 @@ openssh-spec-file-add-init.patch
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0001-Update-package-versioning-for-TIS-format.patch
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openssh-init-script-kill-old-instances-on-start.patch
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0001-Further-parallelize-openssh-build.patch
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spec-remove-TC-config-files.patch
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spec-harden-server-and-client-config.patch
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@ -0,0 +1,40 @@
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From 099d1c1f3376673e9a3c5747c87c8c756c883ce6 Mon Sep 17 00:00:00 2001
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From: Andy Ning <andy.ning@windriver.com>
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Date: Thu, 22 Mar 2018 11:45:26 -0400
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Subject: [PATCH 1/1] CGTS-9265: patch to harden server and client config
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Replace the hardcoded sshd_config and ssh_config files with patches
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to openssh.
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Signed-off-by: Andy Ning <andy.ning@windriver.com>
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---
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SPECS/openssh.spec | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/SPECS/openssh.spec b/SPECS/openssh.spec
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index 7ee5bd8..7c464a2 100644
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--- a/SPECS/openssh.spec
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+++ b/SPECS/openssh.spec
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@@ -240,6 +240,9 @@ Patch955: openssh-7.4p1-sandbox-ibmca.patch
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# Back to UseDNS=yes by default (#1478175)
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Patch956: openssh-7.4p1-usedns-yes.patch
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+# WRS: harden server and client config
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+Patch1000: harden-server-and-client-config.patch
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+
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License: BSD
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Group: Applications/Internet
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BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
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@@ -494,6 +497,9 @@ popd
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%patch100 -p1 -b .coverity
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+# WRS
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+%patch1000 -p1 -b .harden
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+
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%if 0
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# Nothing here yet
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%endif
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--
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1.8.3.1
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@ -0,0 +1,40 @@
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From a0a4b7c9e1cdc4d77c2e6aa61d74e3898aca86a5 Mon Sep 17 00:00:00 2001
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From: Andy Ning <andy.ning@windriver.com>
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Date: Tue, 20 Mar 2018 10:14:56 -0400
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Subject: [PATCH 1/1] CGTS-9265: remove TC specific config files
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The hardcoded sshd_config and ssh_config files are replaced by
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patches to openssh.
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---
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SPECS/openssh.spec | 8 --------
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1 file changed, 8 deletions(-)
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diff --git a/SPECS/openssh.spec b/SPECS/openssh.spec
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index 72ec438..7ee5bd8 100644
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--- a/SPECS/openssh.spec
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+++ b/SPECS/openssh.spec
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@@ -88,10 +88,6 @@ Source11: sshd.service
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Source12: sshd-keygen.service
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Source13: sshd-keygen
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-# WRS
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-Source14: sshd_config
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-Source15: ssh_config
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-
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# Internal debug
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Patch0: openssh-5.9p1-wIm.patch
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@@ -689,10 +685,6 @@ make install DESTDIR=$RPM_BUILD_ROOT
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popd
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%endif
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-# WRS: Overwrite with our config
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-install -m 0640 %{SOURCE14} $RPM_BUILD_ROOT/etc/ssh/sshd_config
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-install -m 0644 %{SOURCE15} $RPM_BUILD_ROOT/etc/ssh/ssh_config
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-
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%clean
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rm -rf $RPM_BUILD_ROOT
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--
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1.8.3.1
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@ -0,0 +1,133 @@
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From 5f272d70827454c71a650018786c444116927348 Mon Sep 17 00:00:00 2001
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From: Andy Ning <andy.ning@windriver.com>
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Date: Thu, 22 Mar 2018 10:16:08 -0400
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Subject: [PATCH 1/1] CGTS-9265: remove sha1 based kex algorithms
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The patch hardened ssh server and client security, specifically
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removed support of sha1 base kex algrorithms as found by Nessus
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scan.
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---
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ssh_config | 3 +++
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sshd_config | 47 ++++++++++++++++++++++++++++-------------------
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2 files changed, 31 insertions(+), 19 deletions(-)
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diff --git a/ssh_config b/ssh_config
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index d1c83ea..3320eb0 100644
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--- a/ssh_config
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+++ b/ssh_config
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@@ -66,3 +66,6 @@ Host *
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SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
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SendEnv LC_IDENTIFICATION LC_ALL LANGUAGE
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SendEnv XMODIFIERS
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+
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+# Filtered key exchange algorithm list
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+KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
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diff --git a/sshd_config b/sshd_config
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index 6bbb86b..122dee3 100644
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--- a/sshd_config
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+++ b/sshd_config
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@@ -25,19 +25,19 @@ HostKey /etc/ssh/ssh_host_ecdsa_key
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HostKey /etc/ssh/ssh_host_ed25519_key
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# Ciphers and keying
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-#RekeyLimit default none
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+RekeyLimit default 1h
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# Logging
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#SyslogFacility AUTH
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-SyslogFacility AUTHPRIV
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-#LogLevel INFO
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+#SyslogFacility AUTHPRIV
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+LogLevel INFO
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# Authentication:
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-#LoginGraceTime 2m
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-#PermitRootLogin yes
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+LoginGraceTime 1m
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+PermitRootLogin no
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#StrictModes yes
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-#MaxAuthTries 6
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+MaxAuthTries 4
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#MaxSessions 10
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#PubkeyAuthentication yes
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@@ -76,8 +76,8 @@ ChallengeResponseAuthentication no
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#KerberosUseKuserok yes
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# GSSAPI options
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-GSSAPIAuthentication yes
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-GSSAPICleanupCredentials no
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+GSSAPIAuthentication no
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+GSSAPICleanupCredentials yes
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#GSSAPIStrictAcceptorCheck yes
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#GSSAPIKeyExchange no
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#GSSAPIEnablek5users no
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@@ -95,10 +95,10 @@ GSSAPICleanupCredentials no
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# problems.
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UsePAM yes
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-#AllowAgentForwarding yes
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-#AllowTcpForwarding yes
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+AllowAgentForwarding no
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+AllowTcpForwarding no
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#GatewayPorts no
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-X11Forwarding yes
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+X11Forwarding no
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#X11DisplayOffset 10
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#X11UseLocalhost yes
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#PermitTTY yes
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@@ -106,21 +106,22 @@ X11Forwarding yes
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#PrintLastLog yes
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#TCPKeepAlive yes
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#UseLogin no
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-#UsePrivilegeSeparation sandbox
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+UsePrivilegeSeparation yes
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#PermitUserEnvironment no
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-#Compression delayed
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-#ClientAliveInterval 0
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-#ClientAliveCountMax 3
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+Compression no
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+ClientAliveInterval 15
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+ClientAliveCountMax 4
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#ShowPatchLevel no
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-#UseDNS yes
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+# Make SSH connect faster on bootup
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+UseDNS no
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#PidFile /var/run/sshd.pid
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#MaxStartups 10:30:100
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#PermitTunnel no
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#ChrootDirectory none
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#VersionAddendum none
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-# no default banner path
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-#Banner none
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+# default banner path
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+Banner /etc/issue.net
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# Accept locale-related environment variables
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AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
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@@ -129,7 +130,7 @@ AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
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AcceptEnv XMODIFIERS
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# override default of no subsystems
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-Subsystem sftp /usr/libexec/sftp-server
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+Subsystem sftp /usr/libexec/openssh/sftp-server
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# Example of overriding settings on a per-user basis
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#Match User anoncvs
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@@ -137,3 +138,11 @@ Subsystem sftp /usr/libexec/sftp-server
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# AllowTcpForwarding no
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# PermitTTY no
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# ForceCommand cvs server
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+DenyUsers admin secadmin operator
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+# Filtered cipher, MAC and key exchange algorithm list, defaults can be
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+# obtained by ssh -Q cipher, ssh -Q mac and ssh -Q kex
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+# TODO (aning): once openssh is updated to 7.5, an explicit exclusion list
|
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+# using "-" should be used for cipher, MAC and kex excluded suites.
|
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+Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
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+MACs hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com
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+KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
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--
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1.8.3.1
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@ -1,9 +0,0 @@
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Index: 6.2p2-r5.5/ssh_config
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===================================================================
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--- 6.2p2-r5.5.orig/ssh_config
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+++ 6.2p2-r5.5/ssh_config
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@@ -45,3 +45,4 @@ Host *
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# PermitLocalCommand no
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# VisualHostKey no
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KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
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+UseRoaming no
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@ -1,78 +0,0 @@
|
||||
---
|
||||
sshd_config | 27 +++++++++++++++------------
|
||||
1 file changed, 15 insertions(+), 12 deletions(-)
|
||||
|
||||
--- a/sshd_config
|
||||
+++ b/sshd_config
|
||||
@@ -33,14 +33,14 @@ Protocol 2
|
||||
# Logging
|
||||
# obsoletes QuietMode and FascistLogging
|
||||
#SyslogFacility AUTH
|
||||
-#LogLevel INFO
|
||||
+LogLevel INFO
|
||||
|
||||
# Authentication:
|
||||
|
||||
-#LoginGraceTime 2m
|
||||
-#PermitRootLogin yes
|
||||
+LoginGraceTime 1m
|
||||
+PermitRootLogin without-password
|
||||
#StrictModes yes
|
||||
-#MaxAuthTries 6
|
||||
+MaxAuthTries 4
|
||||
#MaxSessions 10
|
||||
|
||||
#RSAAuthentication yes
|
||||
@@ -59,7 +59,7 @@ Protocol 2
|
||||
|
||||
# To disable tunneled clear text passwords, change to no here!
|
||||
#PasswordAuthentication yes
|
||||
-#PermitEmptyPasswords no
|
||||
+PermitEmptyPasswords no
|
||||
|
||||
# Change to no to disable s/key passwords
|
||||
ChallengeResponseAuthentication no
|
||||
@@ -85,10 +85,10 @@ ChallengeResponseAuthentication no
|
||||
# and ChallengeResponseAuthentication to 'no'.
|
||||
UsePAM yes
|
||||
|
||||
-#AllowAgentForwarding yes
|
||||
-#AllowTcpForwarding yes
|
||||
+AllowAgentForwarding no
|
||||
+AllowTcpForwarding no
|
||||
#GatewayPorts no
|
||||
-#X11Forwarding no
|
||||
+X11Forwarding no
|
||||
#X11DisplayOffset 10
|
||||
#X11UseLocalhost yes
|
||||
#PrintMotd yes
|
||||
@@ -96,18 +96,19 @@ UsePAM yes
|
||||
#TCPKeepAlive yes
|
||||
#UseLogin no
|
||||
UsePrivilegeSeparation yes
|
||||
-#PermitUserEnvironment no
|
||||
+PermitUserEnvironment no
|
||||
Compression no
|
||||
ClientAliveInterval 15
|
||||
ClientAliveCountMax 4
|
||||
-#UseDNS yes
|
||||
+# Make SSH connect faster on bootup
|
||||
+UseDNS no
|
||||
#PidFile /var/run/sshd.pid
|
||||
#MaxStartups 10
|
||||
#PermitTunnel no
|
||||
#ChrootDirectory none
|
||||
|
||||
-# no default banner path
|
||||
-#Banner none
|
||||
+# default banner path
|
||||
+Banner /etc/issue.net
|
||||
|
||||
# override default of no subsystems
|
||||
Subsystem sftp /usr/libexec/sftp-server
|
||||
@@ -117,3 +118,5 @@ Subsystem sftp /usr/libexec/sftp-server
|
||||
# X11Forwarding no
|
||||
# AllowTcpForwarding no
|
||||
# ForceCommand cvs server
|
||||
+DenyUsers admin secadmin operator
|
||||
+
|
||||
Loading…
Reference in New Issue
Block a user