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# Remove SSH keys from user's configuration (typically ~user/.ssh/authorized_keys)
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#
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# By Alex Tkachenko <alex.sysadm@gmail.com>
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#
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bundle agent rudder_disable_ssh_keys
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{
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vars:
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any::
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"technique_name" string => "SSH keys removal";
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"component_name" string => "SSH key";
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# "config_basename" string => "&SSH_DISABLE_KEY_CONFIG_BASENAME&";
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"config_basename" string => "authorized_keys";
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&SSH_DISABLE_KEY_TAG:{tag |"sshkey_disable_tag[&i&]" string => "&tag&";
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}&
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&SSH_DISABLE_KEY_USERNAME:{username |"sshkey_disable_name[&i&]" string => "&username&";
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}&
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&SSH_DISABLE_KEY_KEYSPEC:{keyspec |"sshkey_disable_key[&i&]" string => "&keyspec&";
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}&
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&TRACKINGKEY:{uuid |"sshkey_disable_uuid[&i&]" string => "&uuid&";
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}&
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"sshkey_disable_index"
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slist => getindices("sshkey_disable_name");
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"sshkey_class_prefix[${sshkey_disable_index}]"
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string => canonify("${sshkey_disable_tag[${sshkey_disable_index}]}_${sshkey_disable_uuid[${sshkey_disable_index}]}");
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"userdata_${sshkey_disable_index}"
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string => execresult("/usr/bin/getent passwd ${sshkey_disable_name[${sshkey_disable_index}]}", "noshell");
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"no_${sshkey_disable_index}"
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int => parsestringarray("userarray_${sshkey_disable_index}", "${userdata_${sshkey_disable_index}}", "", ":", "1000", "200000" );
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"homedir[${sshkey_disable_index}]"
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string => "${userarray_${sshkey_disable_index}[${sshkey_disable_name[${sshkey_disable_index}]}][5]}";
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classes:
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any::
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"begin_evaluation"
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expression => isvariable("sshkey_disable_index");
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begin_evaluation::
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"user_${sshkey_disable_index}_exists"
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expression => userexists("${sshkey_disable_name[${sshkey_disable_index}]}");
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"cfgfile_${sshkey_disable_index}_exists"
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ifvarclass => canonify("user_${sshkey_disable_index}_exists"),
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expression => fileexists("${homedir[${sshkey_disable_index}]}/.ssh/${config_basename}");
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files:
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"${homedir[${sshkey_disable_index}]}/.ssh/${config_basename}"
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comment => "Remove key from ${config_basename}",
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edit_line => remove_ssh_key("${sshkey_disable_key[${sshkey_disable_index}]}"),
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ifvarclass => "cfgfile_${sshkey_disable_index}_exists",
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classes => rudder_common_classes("${sshkey_class_prefix[${sshkey_disable_index}]}");
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methods:
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"No User Exist Report"
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ifvarclass => "!user_${sshkey_disable_index}_exists",
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usebundle => rudder_common_report(
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"${technique_name}", "result_success",
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"${sshkey_disable_uuid[${sshkey_disable_index}]}", "${component_name}", "${sshkey_disable_tag[${sshkey_disable_index}]}", "The user ${sshkey_disable_name[${sshkey_disable_index}]} does NOT exist on this machine...skipping this check"
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);
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"No ${config_basename} File Exist Report"
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ifvarclass => "user_${sshkey_disable_index}_exists.!cfgfile_${sshkey_disable_index}_exists",
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usebundle => rudder_common_report(
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"${technique_name}", "result_success",
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"${sshkey_disable_uuid[${sshkey_disable_index}]}", "${component_name}", "${sshkey_disable_tag[${sshkey_disable_index}]}", "The user ${sshkey_disable_name[${sshkey_disable_index}]} does NOT have ${config_basename} file on this machine...skipping this check"
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);
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# Removal Key Reports - rudder_common_reports_generic is not used as the messaging is reversed
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"Report key not found"
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usebundle => rudder_common_report(
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"${technique_name}", "result_success", "${sshkey_disable_uuid[${sshkey_disable_index}]}", "${component_name}", "${sshkey_disable_tag[${sshkey_disable_index}]}",
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"SSH key \"${sshkey_disable_tag[${sshkey_disable_index}]}\" was not found in user ${sshkey_disable_name[${sshkey_disable_index}]} ${config_basename} file"),
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ifvarclass => "${sshkey_class_prefix[${sshkey_disable_index}]}_kept.!${sshkey_class_prefix[${sshkey_disable_index}]}_repaired.!${sshkey_class_prefix[${sshkey_disable_index}]}_error";
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"Report key removed"
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usebundle => rudder_common_report(
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"${technique_name}", "result_repaired", "${sshkey_disable_uuid[${sshkey_disable_index}]}", "${component_name}", "${sshkey_disable_tag[${sshkey_disable_index}]}",
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"SSH key \"${sshkey_disable_tag[${sshkey_disable_index}]}\" for user ${sshkey_disable_name[${sshkey_disable_index}]} was removed"),
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ifvarclass => "${sshkey_class_prefix[${sshkey_disable_index}]}_repaired.!${sshkey_class_prefix[${sshkey_disable_index}]}_error";
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"Report removal failure"
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usebundle => rudder_common_report(
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"${technique_name}", "result_error", "${sshkey_disable_uuid[${sshkey_disable_index}]}", "${component_name}", "${sshkey_disable_tag[${sshkey_disable_index}]}",
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"SSH key \"${sshkey_disable_tag[${sshkey_disable_index}]}\" for user ${sshkey_disable_name[${sshkey_disable_index}]} could not be removed"),
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ifvarclass => "${sshkey_class_prefix[${sshkey_disable_index}]}_error";
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}
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# Remove ssh key from the file. The key is matched by the key value
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# (i.e. comments, options in the keyspec are ignored).
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bundle edit_line remove_ssh_key(keyspec)
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{
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vars:
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key_parsed::
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"ckey" string => canonify($(keybits[3]));
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"ekey" string => escape($(keybits[3]));
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classes:
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"key_parsed"
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# If the key hash happens to exceed 1000 chars $keybits[3] is going to be undefined because
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# of some weird cfengine bugs, probably this one: https://cfengine.com/dev/issues/1258
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# Therefore we limit the regex to extract as much of the hash as possible to make it unique enough
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# without exceeding 1000 charachter limit.
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# The hashes of that length apparently correspond to DSS 2048 bits keys, generated i.e. on rhel 4,
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# with openssh v3.9p1-redhat. I believe that since openssh v4 DSS bitlengh is limited to 1024,
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# as required by FIPS.
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expression => regextract("(.*\s+)?(ssh-rsa|ssh-dss)\s+(\S{1,1000})\S*=(\s+.+)?\Z", "$(keyspec)", "keybits" );
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delete_lines:
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".*\s$(ekey)\s?.*"
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ifvarclass => "key_parsed";
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}
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