Removed Protocol statement in later versions of sshd, since the code … (#342)
* Removed Protocol statement in later versions of sshd, since the code for SSH-1 has been removed in sshd. Signed-off-by: Farid Joubbi <[email protected]> * Prettified the generated ssh_config. No functional changes, removed spaces and orphan comments. Signed-off-by: Farid Joubbi <[email protected]> * Removed Protocol statement in later versions of sshd, since the code for SSH-1 has been removed in sshd. Signed-off-by: Farid Joubbi <[email protected]> * Removed blank lines and prettified ssh_config. Signed-off-by: Farid Joubbi <[email protected]> * Added note about setting sshd_authenticationmethods if ssh_server_password_login. Signed-off-by: Farid Joubbi <[email protected]> * Backticked true. Signed-off-by: Farid Joubbi <[email protected]>
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Farid Joubbi authored and GitHub committed
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@@ -142,7 +142,7 @@ Warning: This role disables root-login on the target server! Please make sure yo
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- Description: `true` to allow password-based authentication with the ssh client
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- `ssh_server_password_login`
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- Default: `false`
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- Description: `true` to allow password-based authentication with the ssh server
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- Description: `true` to allow password-based authentication to the ssh server. You probably also need to change `sshd_authenticationmethods` to include `password` if you set `ssh_server_password_login`: `true`
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- `ssh_banner`
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- Default: `false`
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- Description: `true` to print a banner on login
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@@ -2,7 +2,7 @@
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{{ ansible_managed | comment }}
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# This is the ssh client system-wide configuration file.
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# See ssh_config(5) for more information on any settings used. Comments will be added only to clarify why a configuration was chosen.
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# See ssh_config(5) for more information on any settings used.
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{% if ssh_custom_options %}
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# Custom configuration that overwrites default configuration
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@@ -26,14 +26,14 @@ Host {{ host.names | join(' ') }}
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{{ host.options | join('\n') | indent(2) }}
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{% endfor %}
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# Global defaults for all Hosts
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Host *
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# The port at the destination should be defined
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Port {{ ssh_client_port }}
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# Identity file configuration. You may restrict available identity files. Otherwise ssh will search for a pattern and use any that matches.
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# Identity file configuration. You may restrict available identity files.
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# Otherwise ssh will search for a pattern and use any that matches.
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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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@@ -42,9 +42,12 @@ Port {{ ssh_client_port }}
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# Security configuration
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# ======================
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# Set the protocol version to 2 for security reasons. Disables legacy support.
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{# Support for legacy SSHv1 has been completely removed from OpenSSH in version 7.6 -#}
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{% if sshd_version is version('7.6', '<') %}
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# Set the protocol version explicitly to 2. Version 1 is obsolete and should not be used.
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Protocol 2
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{% endif %}
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# Make sure passphrase querying is enabled
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BatchMode no
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@@ -54,35 +57,34 @@ CheckHostIP yes
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# Always ask before adding keys to the `known_hosts` file. Do not set to `yes`.
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StrictHostKeyChecking ask
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# **Ciphers** -- If your clients don't support CTR (eg older versions), cbc will be added
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# CBC: is true if you want to connect with OpenSSL-base libraries
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# eg ruby Net::SSH::Transport::CipherFactory requires cbc-versions of the given openssh ciphers to work
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# -- see: (http://net-ssh.github.com/net-ssh/classes/Net/SSH/Transport/CipherFactory.html)
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#
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{# This outputs 'Ciphers <list-of-ciphers>' if ssh_ciphers is defined or '#Ciphers' if ssh_ciphers is undefined #}
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{# This outputs 'Ciphers <list-of-ciphers>' if ssh_ciphers is defined or '#Ciphers' if ssh_ciphers is undefined -#}
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{{ 'Ciphers ' ~ ssh_ciphers|join(',') if ssh_ciphers else 'Ciphers'|comment }}
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# **Hash algorithms** -- Make sure not to use SHA1 for hashing, unless it is really necessary.
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# Weak HMAC is sometimes required if older package versions are used
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# eg Ruby's Net::SSH at around 2.2.* doesn't support sha2 for hmac, so this will have to be set true in this case.
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#
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{# This outputs 'MACs <list-of-macs>' if ssh_macs is defined or '#MACs' if ssh_macs is undefined #}
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{# This outputs 'MACs <list-of-macs>' if ssh_macs is defined or '#MACs' if ssh_macs is undefined -#}
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{{ 'MACs ' ~ ssh_macs|join(',') if ssh_macs else 'MACs'|comment }}
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# Alternative setting, if OpenSSH version is below v5.9
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#MACs hmac-ripemd160
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# **Key Exchange Algorithms** -- Make sure not to use SHA1 for kex, unless it is really necessary
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# Weak kex is sometimes required if older package versions are used
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# eg ruby's Net::SSH at around 2.2.* doesn't support sha2 for kex, so this will have to be set true in this case.
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# based on: https://bettercrypto.org/static/applied-crypto-hardening.pdf
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#
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{# This outputs 'KexAlgorithms <list-of-algos>' if ssh_kex is defined or '#KexAlgorithms' if ssh_kex is undefined #}
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{{ 'KexAlgorithms ' ~ ssh_kex|join(',') if ssh_kex else 'KexAlgorithms'|comment }}
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{% if sshd_version is version('5.9', '<') %}
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# Alternative setting, if OpenSSH version is below v5.9
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#MACs hmac-ripemd160
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{% endif %}
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# Disable agent forwarding, since local agent could be accessed through forwarded connection.
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ForwardAgent no
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@@ -120,6 +122,7 @@ Compression {{ 'yes' if (ssh_client_compression|bool) else 'no' }}
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#VisualHostKey yes
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{% if sshd_version is version('7.1', '<=') %}
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# Disable experimental client roaming. This is known to cause potential issues with secrets being disclosed to malicious servers and defaults to being disabled.
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# Disable experimental client roaming.
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# This is known to cause potential issues with secrets being disclosed to malicious servers. Disabled by default.
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UseRoaming {{ 'yes' if ssh_client_roaming else 'no' }}
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{% endif %}
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@@ -45,9 +45,12 @@ HostKey {{ key }}
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# Security configuration
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# ======================
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{# Support for legacy SSHv1 has been completely removed from OpenSSH in version 7.6 -#}
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{% if sshd_version is version('7.6', '<') %}
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# Set the protocol version explicitly to 2. Version 1 is obsolete and should not be used.
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Protocol 2
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{% endif %}
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# Make sure sshd checks file modes and ownership before accepting logins. This prevents accidental misconfiguration.
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StrictModes {{ 'yes' if (sshd_strict_modes|bool) else 'no' }}
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@@ -63,26 +66,26 @@ LogLevel {{ sshd_log_level }}
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# eg ruby Net::SSH::Transport::CipherFactory requires cbc-versions of the given openssh ciphers to work
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# -- see: (http://net-ssh.github.com/net-ssh/classes/Net/SSH/Transport/CipherFactory.html)
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#
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{# This outputs 'Ciphers <list-of-ciphers>' if ssh_ciphers is defined or '#Ciphers' if ssh_ciphers is undefined #}
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{# This outputs 'Ciphers <list-of-ciphers>' if ssh_ciphers is defined or '#Ciphers' if ssh_ciphers is undefined -#}
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{{ 'Ciphers ' ~ ssh_ciphers|join(',') if ssh_ciphers else 'Ciphers'|comment }}
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# **Hash algorithms** -- SHA-1 is formally deprecated by NIST in 2011 because of security issues.
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# Weak HMAC is sometimes required if older package versions are used
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# eg Ruby's Net::SSH at around 2.2.* doesn't support sha2 for hmac, so this will have to be set true in this case.
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#
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{# This outputs 'MACs <list-of-macs>' if ssh_macs is defined or '#MACs' if ssh_macs is undefined #}
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{# This outputs 'MACs <list-of-macs>' if ssh_macs is defined or '#MACs' if ssh_macs is undefined -#}
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{{ 'MACs ' ~ ssh_macs|join(',') if ssh_macs else 'MACs'|comment }}
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{% if sshd_version is version('5.9', '<') %}
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# Alternative setting, if OpenSSH version is below v5.9
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#MACs hmac-ripemd160
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{% endif %}
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# **Key Exchange Algorithms** -- SHA-1 is formally deprecated by NIST in 2011 because of security issues.
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# Weak kex is sometimes required if older package versions are used
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# eg ruby's Net::SSH at around 2.2.* doesn't support sha2 for kex, so this will have to be set true in this case.
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# based on: https://bettercrypto.org/static/applied-crypto-hardening.pdf
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#
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{# This outputs 'KexAlgorithms <list-of-algos>' if ssh_kex is defined or '#KexAlgorithms' if ssh_kex is undefined #}
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{{ 'KexAlgorithms ' ~ ssh_kex|join(',') if ssh_kex else 'KexAlgorithms'|comment }}
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@@ -114,17 +117,17 @@ IgnoreRhosts yes
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IgnoreUserKnownHosts yes
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HostbasedAuthentication no
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# Enable PAM to enforce system wide rules.
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{% if ssh_pam_support %}
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# Enable PAM to enforce system wide rules.
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UsePAM {{ 'yes' if (ssh_use_pam|bool) else 'no' }}
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{% endif %}
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# Set AuthenticationMethods per default to publickey
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# AuthenticationMethods was introduced in OpenSSH 6.2 - https://www.openssh.com/txt/release-6.2
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{% endif %}
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{# Set AuthenticationMethods per default to publickey -#}
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{# AuthenticationMethods was introduced in OpenSSH 6.2 - https://www.openssh.com/txt/release-6.2 -#}
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{% if sshd_version is version('6.2', '>=') %}
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AuthenticationMethods {{ sshd_authenticationmethods }}
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{% endif %}
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{% endif %}
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# Disable password-based authentication, it can allow for potentially easier brute-force attacks.
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PasswordAuthentication {{ 'yes' if (ssh_server_password_login|bool) else 'no' }}
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PermitEmptyPasswords no
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@@ -142,28 +145,28 @@ KerberosTicketCleanup yes
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GSSAPIAuthentication {{ 'yes' if ssh_gssapi_support else 'no' }}
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GSSAPICleanupCredentials yes
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{% if ssh_deny_users %}
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# In case you don't use PAM (`UsePAM no`), you can alternatively restrict users and groups here.
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# For key-based authentication this is not necessary, since all keys must be explicitely enabled.
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{% if ssh_deny_users %}
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DenyUsers {{ ssh_deny_users }}
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{% endif %}
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{% endif %}
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{% if ssh_allow_users %}
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AllowUsers {{ ssh_allow_users }}
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{% endif %}
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{% endif %}
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{% if ssh_deny_groups %}
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DenyGroups {{ ssh_deny_groups }}
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{% endif %}
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{% endif %}
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{% if ssh_allow_groups %}
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AllowGroups {{ ssh_allow_groups }}
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{% endif %}
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{% endif %}
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{% if ssh_authorized_keys_file %}
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AuthorizedKeysFile {{ ssh_authorized_keys_file }}
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{% endif %}
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{% endif %}
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{% if ssh_trusted_user_ca_keys_file %}
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TrustedUserCAKeys {{ ssh_trusted_user_ca_keys_file }}
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{% if ssh_authorized_principals_file %}
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@@ -178,7 +181,8 @@ AuthorizedPrincipalsFile {{ ssh_authorized_principals_file }}
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TCPKeepAlive no
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# Manage `ClientAlive..` signals via interval and maximum count.
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# This will periodically check up to a `..CountMax` number of times within `..Interval` timeframe, and abort the connection once these fail.
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# This will periodically check up to a `..CountMax` number of times within `..Interval` timeframe,
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# and abort the connection once these fail.
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ClientAliveInterval {{ ssh_client_alive_interval }}
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ClientAliveCountMax {{ ssh_client_alive_count }}
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@@ -238,8 +242,8 @@ Banner {{ ssh_banner_path if (ssh_banner|bool) else 'none' }}
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{% if ansible_facts.os_family == 'Debian' %}
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DebianBanner {{ 'yes' if (ssh_print_debian_banner|bool) else 'no' }}
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{% endif %}
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{% endif %}
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# Reject keys that are explicitly blacklisted
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RevokedKeys /etc/ssh/revoked_keys
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