├── LICENSE ├── README.md ├── defaults └── main.yml ├── handlers └── main.yml ├── library └── snort_rule.py ├── meta └── main.yml ├── molecule └── default │ ├── Dockerfile.j2 │ ├── INSTALL.rst │ ├── molecule.yml │ ├── playbook.yml │ └── tests │ └── test_default.py ├── requirements.yml ├── tasks ├── main.yml └── snort.yml ├── tests ├── inventory └── test.yml └── vars └── main.yml /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ids_rule 2 | =========== 3 | 4 | # Tech Preview 5 | 6 | A role to manage rules and signatures for many different Intrusion Detection 7 | Systems, these are defined as "providers" to the Role. 8 | 9 | Current supported list of providers: 10 | * snort 11 | 12 | Requirements 13 | ------------ 14 | 15 | Red Hat Enterprise Linux 7.x, or derived Linux distribution such as CentOS 7, 16 | Scientific Linux 7, etc 17 | 18 | * [idstools](https://idstools.readthedocs.io/en/latest/) 19 | 20 | Role Variables 21 | -------------- 22 | 23 | * `ids_provider` - This defines what IDS provider (Default Value: "snort") 24 | * `ids_rule` - The rule you would like to add or remove to/from managed set of 25 | rules 26 | * `ids_rule_state` - Should be one of `present` or `absent` 27 | * `ids_rules_file` - The rules file the manage (default: 28 | `/etc/snort/rules/local.rules`) 29 | 30 | Dependencies 31 | ------------ 32 | 33 | Dependencies will vary by provider 34 | 35 | ## snort Dependencies 36 | 37 | * [ 38 | 39 | 40 | Example Playbook 41 | ---------------- 42 | 43 | - name: manage snort rules 44 | hosts: idshosts 45 | become: yes 46 | become_user: root 47 | gather_facts: false 48 | 49 | vars: 50 | ids_provider: snort 51 | protocol: tcp 52 | source_port: any 53 | source_ip: any 54 | dest_port: any 55 | dest_ip: any 56 | 57 | tasks: 58 | - name: Add snort password attack rule 59 | include_role: 60 | name: "ids_rule" 61 | vars: 62 | ids_rule: 'alert {{protocol}} {{source_ip}} {{source_port}} -> {{dest_ip}} {{dest_port}} (msg:"Attempted /etc/passwd Attack"; uricontent:"/etc/passwd"; classtype:attempted-user; sid:99000004; priority:1; rev:1;)' 63 | ids_rules_file: '/etc/snort/rules/local.rules' 64 | ids_rule_state: present 65 | 66 | 67 | License 68 | ------- 69 | 70 | GPLv3 71 | 72 | Author Information 73 | ------------------ 74 | 75 | [Ansible Security Automation Team](https://github.com/ansible-security) 76 | -------------------------------------------------------------------------------- /defaults/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # defaults file for ids_rule 3 | 4 | ids_provider_list: 5 | - snort 6 | -------------------------------------------------------------------------------- /handlers/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # handlers file for ids_rule 3 | - name: restart snort 4 | service: 5 | name: snort 6 | state: restarted 7 | -------------------------------------------------------------------------------- /library/snort_rule.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | # -*- coding: utf-8 -*- 3 | 4 | # (c) 2018, Adam Miller (admiller@redhat.com) 5 | # MIT License (see LICENSE or https://opensource.org/licenses/MIT) 6 | 7 | from __future__ import absolute_import, division, print_function 8 | __metaclass__ = type 9 | 10 | 11 | ANSIBLE_METADATA = {'metadata_version': '1.1', 12 | 'status': ['preview'], 13 | 'supported_by': 'community'} 14 | 15 | 16 | DOCUMENTATION = ''' 17 | --- 18 | module: snort_rule 19 | short_description: Manage snort rules 20 | description: 21 | - This module allows for addition or deletion of snort rules 22 | version_added: "2.7" 23 | options: 24 | rule: 25 | description: 26 | - "The rule definition" 27 | required: true 28 | state: 29 | description: 30 | - Add or remove a rule. 31 | required: true 32 | choices: [ "present", "absent" ] 33 | rules_file: 34 | description: 35 | - Path to the .rules file this rule should exist in 36 | required: false 37 | default: /etc/snort/rules/ansible_managed.rules 38 | requirements: [ 'idstools>= 0.6.3' ] 39 | author: "Adam Miller (@maxamillion)" 40 | ''' 41 | 42 | EXAMPLES = ''' 43 | - snort_rule: 44 | rule: 'alert tcp {{home_net}} any -> {{external_net}} {{http_ports}} (msg:"APP-DETECT Absolute Software Computrace outbound connection - search.namequery.com"; flow:to_server,established; content:"Host|3A| search.namequery.com|0D 0A|"; fast_pattern:only; http_header; content:"TagId: "; http_header; metadata:policy security-ips drop, ruleset community, service http; reference:url,absolute.com/support/consumer/technology_computrace; reference:url,www.blackhat.com/presentations/bh-usa-09/ORTEGA/BHUSA09-Ortega-DeactivateRootkit-PAPER.pdf; classtype:misc-activity; sid:26287; rev:4;)' 45 | state: present 46 | 47 | - snort_rule: 48 | rule: 'alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any' 49 | state: present 50 | rules_file: /etc/snort/rules/grab_everything_http.rules 51 | ''' 52 | 53 | from ansible.module_utils.basic import AnsibleModule 54 | from ansible.module_utils._text import to_text 55 | 56 | HAS_IDSTOOLS = True 57 | try: 58 | from idstools import rule 59 | from idstools import maps 60 | except ImportError: 61 | HAS_IDSTOOLS = False 62 | 63 | 64 | SIGMAP_FILE = "/etc/snort/sid-msg.map" 65 | GENMAP_FILE = "/etc/snort/gen-msg.map" 66 | 67 | def main(): 68 | 69 | module = AnsibleModule( 70 | argument_spec=dict( 71 | rule=dict(required=True, default=None), 72 | state=dict(choices=['present', 'absent'], required=True), 73 | rules_file=dict(required=False, default='/etc/snort/rules/ansible_managed.rules'), 74 | ), 75 | supports_check_mode=True 76 | ) 77 | 78 | if not HAS_IDSTOOLS: 79 | module.fail_json(msg="Python module idstools not found on host, but is required for snort_rule Ansible module") 80 | 81 | try: 82 | matched_rules = [ 83 | snort_rule for snort_rule in rule.parse_file(module.params['rules_file']) 84 | if to_text(snort_rule) == to_text(rule.parse(module.params['rule'])) 85 | ] 86 | except IOError: 87 | module.fail_json(msg="rule file {} not found or permission was denied attempting access it".format(module.params['rules_file'])) 88 | rule_found = True if matched_rules else False 89 | 90 | sigmap = maps.SignatureMap() 91 | try: 92 | sigmap.load_generator_map(open(GENMAP_FILE, 'r')) 93 | except IOError: 94 | module.fail_json(msg="generator file {} not found or permission was denied attempting to access it".format(GENMAP_FILE)) 95 | try: 96 | sigmap.load_signature_map(open(SIGMAP_FILE, 'r')) 97 | except IOError: 98 | module.fail_json(msg="signature file {} not found or permission was denied attempting to access it".format(SIGMAP_FILE)) 99 | 100 | 101 | if module.params['state'] == 'present' and rule_found: 102 | module.exit_json( 103 | msg="Rule '{}' already present in rules_file {}".format(module.params['rule'], module.params['rules_file']), 104 | changed=False 105 | ) 106 | elif module.params['state'] == 'present' and not rule_found: 107 | if module.check_mode: 108 | module.exit_json( 109 | msg="Rule '{}' would be added to rules_file {}".format(module.params['rule'], module.params['rules_file']), 110 | changed=True 111 | ) 112 | 113 | new_snort_rule = rule.parse(module.params['rule']) 114 | 115 | with open(module.params['rules_file'], 'a') as rules_file: 116 | rules_file.write(to_text("\n{}".format(new_snort_rule))) 117 | 118 | with open(SIGMAP_FILE, 'a') as sigmap_file: 119 | if "ref" in new_snort_rule and len(new_snort_rule["ref"]) > 0: 120 | sigmap_file.write(to_text("\n{} || {} || {}".format( 121 | new_snort_rule['sid'], new_snort_rule['msg'], " || ".join(new_snort_rule['ref']) 122 | ))) 123 | else: 124 | sigmap_file.write(to_text("\n{} || {}".format(new_snort_rule['sid'], new_snort_rule['msg']))) 125 | 126 | module.exit_json( 127 | msg="Rule '{}' added to rules_file {}".format(module.params['rule'], module.params['rules_file']), 128 | changed=True 129 | ) 130 | 131 | if module.params['state'] == 'absent' and not rule_found: 132 | module.exit_json( 133 | msg="Rule '{}' does not exist in rules_file {}".format(module.params['rule'], module.params['rules_file']), 134 | changed=False 135 | ) 136 | elif module.params['state'] == 'absent' and rule_found: 137 | new_snort_rule = rule.parse(module.params['rule']) 138 | 139 | changed = False 140 | 141 | orig_rulefile_contents = [] 142 | orig_sigmapfile_contents = [] 143 | new_rulefile_contents = [] 144 | new_sigmapfile_contents = [] 145 | with open(module.params['rules_file'], 'r') as rules_file: 146 | orig_rulefile_contents = rules_file.readlines() 147 | with open(SIGMAP_FILE,'r') as sigmap_file: 148 | orig_sigmapfile_contents = sigmap_file.readlines() 149 | 150 | new_rulefile_contents = [ 151 | line for line in orig_rulefile_contents 152 | if new_snort_rule != rule.parse(line) 153 | ] 154 | 155 | if "ref" in new_snort_rule and len(new_snort_rule["ref"]) > 0: 156 | new_sigmapfile_contents = [ 157 | line for line in orig_sigmapfile_contents 158 | if "{} || {} || {}".format( 159 | new_snort_rule['sid'], new_snort_rule['msg'], ' || '.join(new_snort_rule['ref']) 160 | ) != line.strip() 161 | ] 162 | else: 163 | new_sigmapfile_contents = [ 164 | line for line in orig_sigmapfile_contents 165 | if "{} || {}".format(new_snort_rule['sid'], new_snort_rule['msg']) != line.strip() 166 | ] 167 | 168 | if module.check_mode: 169 | if len(orig_rulefile_contents) != len(new_rulefile_contents): 170 | module.exit_json( 171 | msg="Rule '{}' would have been removed from rules_file {}".format( 172 | module.params['rule'], 173 | module.params['rules_file'] 174 | ), 175 | changed=True 176 | ) 177 | 178 | if len(orig_rulefile_contents) != len(new_rulefile_contents): 179 | changed = True 180 | with open(module.params['rules_file'], 'w') as rules_file: 181 | for line in new_rulefile_contents: 182 | rules_file.write(line) 183 | 184 | if new_sigmapfile_contents and (len(orig_sigmapfile_contents) != len(new_sigmapfile_contents)): 185 | changed = True 186 | with open(SIGMAP_FILE, 'w') as sigmap_file: 187 | for line in new_sigmapfile_contents: 188 | sigmap_file.write(line) 189 | 190 | module.exit_json( 191 | msg="Rule '{}' has been removed from rules_file {}".format( 192 | module.params['rule'], 193 | module.params['rules_file'] 194 | ), 195 | changed=changed 196 | ) 197 | 198 | 199 | if __name__ == '__main__': 200 | main() 201 | -------------------------------------------------------------------------------- /meta/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | galaxy_info: 3 | author: Ansible Security Automation team 4 | description: > 5 | Ansible role to manage rules and signatures for Intrusion Detection Systems 6 | company: Red Hat 7 | 8 | # If the issue tracker for your role is not on github, uncomment the 9 | # next line and provide a value 10 | # issue_tracker_url: http://example.com/issue/tracker 11 | 12 | # Some suggested licenses: 13 | # - BSD (default) 14 | # - MIT 15 | # - GPLv2 16 | # - GPLv3 17 | # - Apache 18 | # - CC-BY 19 | license: GPLv3 20 | 21 | min_ansible_version: 2.6 22 | 23 | # If this a Container Enabled role, provide the minimum Ansible Container 24 | # version. 25 | # min_ansible_container_version: 26 | 27 | # Optionally specify the branch Galaxy will use when accessing the GitHub 28 | # repo for this role. During role install, if no tags are available, 29 | # Galaxy will use this branch. During import Galaxy will access files on 30 | # this branch. If Travis integration is configured, only notifications for 31 | # this branch will be accepted. Otherwise, in all cases, the repo's default 32 | # branch (usually master) will be used. 33 | # github_branch: 34 | 35 | # 36 | # platforms is a list of platforms, and each platform has a name and a list 37 | # of versions. 38 | # 39 | platforms: 40 | - name: RHEL 41 | versions: 42 | - 7 43 | # - 25 44 | # - name: SomePlatform 45 | # versions: 46 | # - all 47 | # - 1.0 48 | # - 7 49 | # - 99.99 50 | 51 | galaxy_tags: [] 52 | # List tags for your role here, one per line. A tag is a keyword that 53 | # describes and categorizes the role. Users find roles by searching for tags. 54 | # Be sure to remove the '[]' above, if you add tags to this list. 55 | # 56 | # NOTE: A tag is limited to a single word comprised of alphanumeric 57 | # characters. Maximum 20 tags per role. 58 | 59 | dependencies: [] 60 | # List your role dependencies here, one per line. Be sure to remove the '[]' 61 | # above, if you add dependencies to this list. 62 | -------------------------------------------------------------------------------- /molecule/default/Dockerfile.j2: -------------------------------------------------------------------------------- 1 | FROM centos:7 2 | ENV container=docker 3 | RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \ 4 | systemd-tmpfiles-setup.service ] || rm -f $i; done); \ 5 | rm -f /lib/systemd/system/multi-user.target.wants/*;\ 6 | rm -f /etc/systemd/system/*.wants/*;\ 7 | rm -f /lib/systemd/system/local-fs.target.wants/*; \ 8 | rm -f /lib/systemd/system/sockets.target.wants/*udev*; \ 9 | rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \ 10 | rm -f /lib/systemd/system/basic.target.wants/*;\ 11 | rm -f /lib/systemd/system/anaconda.target.wants/*; 12 | RUN yum makecache fast && yum install -y python libselinux-python sudo yum-plugin-ovl bash && sed -i 's/plugins=0/plugins=1/g' /etc/yum.conf && yum clean all; 13 | VOLUME [ "/sys/fs/cgroup" ] 14 | CMD ["/usr/sbin/init"] 15 | 16 | 17 | 18 | -------------------------------------------------------------------------------- /molecule/default/INSTALL.rst: -------------------------------------------------------------------------------- 1 | ******* 2 | Docker driver installation guide 3 | ******* 4 | 5 | Requirements 6 | ============ 7 | 8 | * General molecule dependencies (see https://molecule.readthedocs.io/en/latest/installation.html) 9 | * podman >= 1.4.1 10 | 11 | Install 12 | ======= 13 | 14 | $ yum -y install podman 15 | -------------------------------------------------------------------------------- /molecule/default/molecule.yml: -------------------------------------------------------------------------------- 1 | --- 2 | dependency: 3 | name: galaxy 4 | enabled: true 5 | options: 6 | role-file: requirements.yml 7 | driver: 8 | name: podman 9 | lint: 10 | name: yamllint 11 | platforms: 12 | - name: instance 13 | image: centos:7 14 | privileged: true 15 | command: "/usr/sbin/init" 16 | tty: true 17 | provisioner: 18 | name: ansible 19 | lint: 20 | name: ansible-lint 21 | scenario: 22 | name: default 23 | verifier: 24 | name: testinfra 25 | lint: 26 | name: flake8 27 | -------------------------------------------------------------------------------- /molecule/default/playbook.yml: -------------------------------------------------------------------------------- 1 | --- 2 | - name: Converge 3 | hosts: all 4 | vars: 5 | ids_provider: "snort" 6 | ids_config_provider: "snort" 7 | ids_config_remote_log: true 8 | ids_config_remote_log_destination: 10.4.1.4 9 | ids_config_remote_log_procotol: udp 10 | ids_install_normalize_logs: false 11 | protocol: tcp 12 | source_port: any 13 | source_ip: any 14 | dest_port: any 15 | dest_ip: any 16 | 17 | tasks: 18 | - name: import the geerlingguy.repo-epel 19 | import_role: 20 | name: "geerlingguy.repo-epel" 21 | 22 | - name: import the ids_install role 23 | import_role: 24 | name: "ansible_security.ids_install" 25 | 26 | - name: import the ids_config role 27 | import_role: 28 | name: "ansible_security.ids_config" 29 | 30 | - name: install python-idstools 31 | yum: 32 | name: python-idstools 33 | state: present 34 | 35 | - name: Add snort password attack rule (multi-line) 36 | include_role: 37 | name: "ids_rule" 38 | vars: 39 | ids_rule: >- 40 | alert {{ protocol }} {{ source_ip }} {{ source_port }} -> 41 | {{ dest_ip }} {{ dest_port }} 42 | ( 43 | msg:"Attempted DDoS Attack"; 44 | uricontent:"/ddos_simulation"; 45 | classtype:successful-dos; 46 | sid:99000010; 47 | priority:1; 48 | rev:1; 49 | )' 50 | ids_rules_file: '/etc/snort/rules/local.rules' 51 | ids_rule_state: present 52 | -------------------------------------------------------------------------------- /molecule/default/tests/test_default.py: -------------------------------------------------------------------------------- 1 | import os 2 | 3 | import testinfra.utils.ansible_runner 4 | 5 | testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner( 6 | os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all') 7 | 8 | 9 | def test_hosts_file(host): 10 | f = host.file('/etc/hosts') 11 | 12 | assert f.exists 13 | assert f.user == 'root' 14 | assert f.group == 'root' 15 | 16 | 17 | def test_snort_rule(host): 18 | f = host.file('/etc/snort/rules/local.rules') 19 | 20 | assert f.exists 21 | 22 | rule_pattern = 'alert tcp any any -> any any' 23 | rule_pattern += ' ( msg:"Attempted DDoS Attack";' 24 | rule_pattern += ' uricontent:"/ddos_simulation"; classtype:successful-dos;' 25 | rule_pattern += ' sid:99000010; priority:1; rev:1; )' 26 | assert f.contains(rule_pattern) 27 | -------------------------------------------------------------------------------- /requirements.yml: -------------------------------------------------------------------------------- 1 | --- 2 | 3 | - src: geerlingguy.repo-epel 4 | 5 | - src: ansible_security.ids_install 6 | 7 | - src: ansible_security.ids_config 8 | -------------------------------------------------------------------------------- /tasks/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # tasks file for ids_rule 3 | 4 | - name: verify required variable ids_provider is defined 5 | fail: 6 | msg: "Required variable 'ids_provider' is not defined" 7 | when: ids_provider is not defined 8 | 9 | - name: ensure ids_provider is valid 10 | fail: 11 | msg: > 12 | Provided value for 'ids_provider' is not valid, must be one of 13 | {{ ids_provider_list }} 14 | when: ids_provider not in ids_provider_list 15 | 16 | - name: verify required variable ids_rule is defined 17 | fail: 18 | msg: "Required variable 'ids_rule' is not defined" 19 | when: ids_rule is not defined 20 | 21 | - name: verify required variable ids_rule_state is defined 22 | fail: 23 | msg: "Required variable 'ids_rule_state' is not defined" 24 | when: ids_rule_state is not defined 25 | 26 | - name: include ids_provider tasks 27 | include_tasks: "{{ ids_provider }}.yml" 28 | -------------------------------------------------------------------------------- /tasks/snort.yml: -------------------------------------------------------------------------------- 1 | --- 2 | - name: Manage snort rule 3 | snort_rule: 4 | rule: "{{ ids_rule }}" 5 | state: "{{ ids_rule_state }}" 6 | rules_file: "{{ ids_rules_file|default('/etc/snort/rules/local.rules') }}" 7 | notify: restart snort 8 | -------------------------------------------------------------------------------- /tests/inventory: -------------------------------------------------------------------------------- 1 | localhost 2 | 3 | -------------------------------------------------------------------------------- /tests/test.yml: -------------------------------------------------------------------------------- 1 | --- 2 | - hosts: localhost 3 | remote_user: root 4 | roles: 5 | - ids_rule 6 | -------------------------------------------------------------------------------- /vars/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | # vars file for ids_rule 3 | --------------------------------------------------------------------------------