Clever Geek Handbook

Automatiser la recherche de secrets dans git et ansible

Savez-vous ce qui est stocké dans votre référentiel git? Parmi les centaines de commits, y a-t-il des mots de passe des serveurs de produits qui sont arrivés par erreur?





Mais que se passe-t-il si le script ansible plante lors de la publication et met en évidence les mots de passe dans le journal?





Je vais vous expliquer comment nous avons essayé d'automatiser ces contrôles et ce qui en est résulté.





Bonjour, Habr!

Je m'appelle Oleg, je travaille dans une assez grande banque pour la Fédération de Russie, dans la division IT pour IT.





  (OPS)  (ansible)   . 





2 git ( , ), , , , OPS .





,   master  OPS. 





? git    ( ) OPS. Jenkins git - ( ) OPS.





git? ?





, . secret management,  HashiCorp Vault, CyberArk Conjur .





, .





, pull request .





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3 , :





 





---
    dev_ssh_username1: "admin"
    dev_ssh_password1: "admin123"

- .









shell command ansible





- name: Deploy
  hosts: all
  tasks:
    - name: Update
      shell: "update.sh --user={{ update_user }} --password={{ update_password }}"

, playbook -v .





$ ansible-playbook deploy.yml -i env/DEV/hosts -v
TASK [Update] ******************************************************************
changed: [192.168.1.2] => {"changed": true, "cmd": "/home/dev/update.sh --user=secret_user --password=secret_password", "delta": "0:00:05.056532", "end": "2020-11-06 09:53:09.397355", "rc": 0, "start": "2020-11-06 09:53:04.340823", "stderr": "", "stderr_lines": [], "stdout": "Update SUCCESS", "stdout_lines": ["Update SUCCESS"]}

, playbook ( -v)





$ ansible-playbook deploy.yml -i env/DEV/hosts
TASK [Update] ******************************************************************
fatal: [192.168.1.2]: FAILED! => {"changed": true, "cmd": "/home/dev/update.sh --user=secret_user --password=secret_password", "delta": "0:00:00.018710", "end": "2020-11-06 10:14:30.642419", "msg": "non-zero return code", "rc": 127, "start": "2020-11-06 10:14:30.623709", "stderr": "/bin/sh: /home/dev/update.sh:     ", "stderr_lines": ["/bin/sh: /home/dev/update.sh:     "], "stdout": "", "stdout_lines": []}

  environment, :





- name: Deploy
  hosts: all
  tasks:
    - name: Update
      shell: "/home/dev/update.sh $AUTH_DATA"
      environment:
        AUTH_DATA: "--user={{ update_user }} --password={{ update_password }}"

credentials . no_log.









withCredentials





Jenkins, credentials  withCredentials. pipeline credential, , . Jenkins .





, , :





node {
  stage('Jenkins Credentials | Decrypt Secret File') {
    withCredentials([file(credentialsId: 'credentials-id', variable: 'secretFile')]) {
      sh 'cat $secretFile'
    }
  }
}

, , . ,  secretFile  withCredentials.











, . ( ).





.  SonarQube   Checkmarx. .





- SonarQube Hard-coded credentials are security-sensitive





, . ,  .





C Checkmarx - . ( Application Security ). , :





import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class DemoController {
    @RequestMapping("/show_me_creds")
    public @ResponseBody String show_me_creds() {
        String thisIsMyLittleSecret = "qwerty12345";
        return thisIsMyLittleSecret;
    }
}

opensource . google "find secrets in git" :





Gitleaks, :





  • regexp, ;





  • ;





  • json;





  • ;





  • .





- toml , : 





[[rules]]
  description = "generic secret regex"
  regex = '''secret(.{0,20})([0-9a-zA-Z-._{}$\/\+=]{20,120})'''
  tags = ["secret", "example"]

, : 





[[rules]]
  description = "entropy and regex example"
  regex = '''secret(.{0,20})([0-9a-zA-Z-._{}$\/\+=]{20,120})'''
  [[rules.Entropies]]
    Min = "4.5"
    Max = "4.7"

: " , ,    4,5 4,7, "





,  .





:





➜  ~  gitleaks --repo=gitleaks --repo=https://github.com/gitleakstest/gronit.git --verbose --pretty
INFO[2020-04-28T13:00:34-04:00] cloning... https://github.com/gitleakstest/gronit.git
Enumerating objects: 135, done.
Total 135 (delta 0), reused 0 (delta 0), pack-reused 135
{
        "line": "const AWS_KEY = \"AKIALALEMEL33243OLIAE\"",
        "offender": "AKIALALEMEL33243OLIA",
        "commit": "eaeffdc65b4c73ccb67e75d96bd8743be2c85973",
        "repo": "gronit.git",
        "rule": "AWS Manager ID",
        "commitMessage": "remove fake key",
        "author": "Zachary Rice",
        "email": "zricethezav@users.noreply.github.com",
        "file": "main.go",
        "date": "2018-02-04T19:43:28-06:00",
        "tags": "key, AWS"
}
...
...
WARN[2020-04-28T13:00:35-04:00] 6 leaks detected. 33 commits audited in 77 milliseconds 738 microseconds

, gitleaks - .





- whitelist , :





[[rules]]
  description = "entropy and regex example"
  regex = '''secret(.{0,20})['|"]([0-9a-zA-Z-._{}$\/\+=]{20,120})['|"]'''
  [[rules.Entropies]]
    Min = "4.5"
    Max = "4.7"
  [[rules.whitelist]]
    regex = '''secret.some_value_that_match_regexp_but_not_really_a_secret'''
    description = "ignore that string"

- pull request webhook Jenkins, , gitleaks - NEED WORK.





, , gitleaks ( ). 





ansible

, , playbook, Jenkins .





- name: Deploy
  hosts: all
  tasks:
    - name: Update
      shell: "update.sh --user={{ update_user }} --password={{ update_password }}"

ansible - , OPA (      ), python.





,  Ansible Lint.





Ansible, " " , .





2 :





  • ;





  • playbook. , . 





- python , id, short description, description tags ( Ansible Lint ) match matchtask, .   .





matchtask, task, . 





, ( ):





class CommandsInsteadOfModulesRule(AnsibleLintRule):
    id = '303'
    shortdesc = 'Using command rather than module'
    description = (
        'Executing a command when there is an Ansible module '
        'is generally a bad idea'
    )
    severity = 'HIGH'
    tags = ['command-shell', 'resources', 'ANSIBLE0006']
 
    _commands = ['command', 'shell']
    _modules = {
        'apt-get': 'apt-get',
# ,    
        'yum': 'yum',
    }
 
    def matchtask(self, file, task):
        if task['action']['__ansible_module__'] not in self._commands:
            return
 
        first_cmd_arg = get_first_cmd_arg(task)
        if not first_cmd_arg:
            return
 
        executable = os.path.basename(first_cmd_arg)
        if executable in self._modules and \
                boolean(task['action'].get('warn', True)):
            message = '{0} used in place of {1} module'
            return message.format(executable, self._modules[executable])

- task command shell  _modules - .





- (password/pass/login ) command shell . 





no_log, . no_log - .





, Gitleaks Ansible Lint, . , .. ( ).





withCredentials

, Jenkinsfile , ( ).





node {
  stage('Jenkins Credentials | Decrypt Secret File') {
    withCredentials([file(credentialsId: 'credentials-id', variable: 'secretFile')]) {
      sh 'cat $secretFile'
    }
  }
}

.





Jenkinsfile groovy,  Abstract Syntax Tree  .   AstBuilder  ,  withCredentials, withCredentials. , .





,   secretFile - stage,  secretFile . 





1000 , ,   .





, pipeline  Pipeline model definition plugin, pipeline json . - .





?

, 1000 pull request. 3% gitleaks, , ansible.





, OPS .





, :





  • https://nightfall.ai/resources/introducing-radar-api-detect-credentials-secrets-in-code-via-machine-learning/ - . - ?





  • https://www.shellcheck.net/ - shell .





  • https://github.com/PyCQA/bandit - security linter python.





  • https://twitter.com/leak_scavenger  est juste un bot Twitter intéressant qui scanne github, pastebin, ghostbin à la recherche de secrets, de cartes de crédit, de clés privées, etc. Les sources sont bien sûr disponibles.











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