PASSWORD Improvements #421

cleberb · 2023-10-19T20:27:32Z

Add options:
- faillock_enable
- faillock
  - admin_group
  - audit
  - deny
  - dir
  - even_deny_root
  - fail_interval
  - local_users_only
  - no_log_info
  - nodelay
  - root_unlock_time
  - silent
  - unlock_time
- login_defs
  - login_retries
  - login_timeout
  - pass_max_days
  - pass_min_days
  - pass_warn_age
- password_remember
Change options:
- pwquality
  - dcredit
  - dictcheck
  - dictpath
  - difok
  - enforce_for_root
  - enforcing
  - gecoscheck
  - lcredit
  - local_users_only
  - maxclassrepeat
  - maxrepeat
  - minclass
  - minlen
  - ocredit
  - retry
  - ucredit
  - usercheck
  - usersubstr
Improvements of password algorithm
Add e change templates
Remove pam_tally2
Verify hash of passwords with mkpasswd with yescrypt support

- Add options: - faillock_enable - faillock - admin_group - audit - deny - dir - even_deny_root - fail_interval - local_users_only - no_log_info - nodelay - root_unlock_time - silent - unlock_time - login_defs - login_retries - login_timeout - pass_max_days - pass_min_days - pass_warn_age - password_remember - Change options: - pwquality - dcredit - dictcheck - dictpath - difok - enforce_for_root - enforcing - gecoscheck - lcredit - local_users_only - maxclassrepeat - maxrepeat - minclass - minlen - ocredit - retry - ucredit - usercheck - usersubstr - Improvements of password algorithm - Add e change templates - Remove pam_tally2 - Verify hash of passwords with mkpasswd with yescrypt support

cleberb · 2023-10-19T20:30:29Z

There are many changes and a more detailed test is necessary, especially in the molecule test, in terms of using mkpasswd. If anyone knows a simpler alternative, feel free to help, as unfortunately yescrypt is not yet supported by Ansible.

konstruktoid · 2023-10-19T22:43:39Z

Thanks yet again. It looks good when glancing over the changes, but I'll start testing as soon as possible.

konstruktoid · 2023-10-20T10:26:39Z

TASK [Install mkpasswd] ********************************************************
fatal: [focal]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [bookworm]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [jammy]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [almalinux8]: FAILED! => {"changed": false, "failures": ["No package mkpasswd available."], "msg": "Failed to install some of the specified packages", "rc": 1, "results": []}
changed: [almalinux9]

it's oddly named whois on Ubuntu, don't know about AlmaLinux8.

cleberb · 2023-10-20T15:45:07Z

TASK [Install mkpasswd] ********************************************************
fatal: [focal]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [bookworm]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [jammy]: FAILED! => {"changed": false, "msg": "No package matching 'mkpasswd' is available"}
fatal: [almalinux8]: FAILED! => {"changed": false, "failures": ["No package mkpasswd available."], "msg": "Failed to install some of the specified packages", "rc": 1, "results": []}
changed: [almalinux9]

it's oddly named whois on Ubuntu, don't know about AlmaLinux8.

As they are specific tools for this test, I believe that installing them only on the test machines is ideal.
In the redhat family, the package is only available in version 9 with the name "mkpasswd" and the encryption "yescrypt" is also only available in this version.

konstruktoid · 2023-10-20T15:48:32Z

As they are specific tools for this test, I believe that installing them only on the test machines is ideal. In the redhat family, the package is only available in version 9 with the name "mkpasswd" and the encryption "yescrypt" is also only available in this version.

Indeed, just install them when verifying

konstruktoid · 2023-10-20T15:49:39Z

The Set rounds task isn't idempotent on AlmaLinux.

Idempotence test failed because of the following tasks:
*  => ansible-role-hardening : Set rounds

konstruktoid · 2023-10-20T18:48:05Z

Will debug this...

Test machine:

~$ lsb_release -d
Description:	Ubuntu 22.04.3 LTS
~$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt --rounds=11
crypt: Invalid argument
~$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt
$y$j9T$fKUyYvKRu7J3pTcdOV0DG0$amcL1DWCQqGvhbnnU83bxQEK4pPphDBRKjz8CBNYdN.
~$ mkpasswd --version | head -n1
mkpasswd 5.5.13

My laptop:

$ lsb_release -d
Description:	Ubuntu 22.04.3 LTS
$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt --rounds=11
$y$jFT$TNDsck0dtL/n6LLXNmAeh0$wJycEcIihrHDz5raItc4egQmsVV7YcmM7cifEO7bwm6

cleberb · 2023-10-20T19:25:16Z

Will debug this...

Test machine:

~$ lsb_release -d
Description:	Ubuntu 22.04.3 LTS
~$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt --rounds=11
crypt: Invalid argument
~$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt
$y$j9T$fKUyYvKRu7J3pTcdOV0DG0$amcL1DWCQqGvhbnnU83bxQEK4pPphDBRKjz8CBNYdN.
~$ mkpasswd --version | head -n1
mkpasswd 5.5.13

My laptop:

$ lsb_release -d
Description:	Ubuntu 22.04.3 LTS
$ echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt --rounds=11
$y$jFT$TNDsck0dtL/n6LLXNmAeh0$wJycEcIihrHDz5raItc4egQmsVV7YcmM7cifEO7bwm6

This is very strange. Functional on my machine and an Ubuntu VM. Is it limited to resource settings (CPU and RAM)?
For yescrypt, it is limited to 11, try reducing this number and see if the error persists, if it does, I will remove the option in the test.

https://medium.com/@slimm609/cost-based-password-hashing-b383bbb355df

konstruktoid · 2023-10-20T21:30:29Z

Yes, reducing the rounds fixed this, tested on VMs and on RPis.
Since the default is 6 rounds, https://github.com/openwall/yescrypt/blob/main/yescrypt.h#L118, I'll suggest we up it to 8 just to be safe.

konstruktoid · 2023-10-20T21:36:51Z

diff --git a/molecule/default/verify.yml b/molecule/default/verify.yml
index 23fadaa..e602e6c 100644
--- a/molecule/default/verify.yml
+++ b/molecule/default/verify.yml
@@ -933,9 +933,9 @@
             - ansible_os_family == "Debian"
 
         - name: Create yescrypt password hash
-          ansible.builtin.shell: |-
+          ansible.builtin.shell: |
             set -o pipefail
-            echo -n '{{ item }}' | mkpasswd --stdin --method=yescrypt --rounds=11 | tr -d '\n'
+            echo -n '{{ item }}' | mkpasswd --stdin --method=yescrypt --rounds=8
           args:
             executable: /bin/bash
           register: mkpasswd
@@ -949,7 +949,7 @@
         - name: Set passwords
           ansible.builtin.set_fact:
             passwords: "{{ mkpasswd.results | map(attribute='stdout') | list }}"
-          when: mkpasswd.rc != 0
+          when: mkpasswd and password_algorithm == "yescrypt"
 
         - name: Create sha512 password hash
           vars:
diff --git a/tasks/password.yml b/tasks/password.yml
index a6965c7..29d41e7 100644
--- a/tasks/password.yml
+++ b/tasks/password.yml
@@ -117,7 +117,7 @@
       ansible.builtin.replace:
         path: "{{ item }}"
         regexp: '(\s+{{ password_algorithm }}\s+(?!rounds=)\S*)(\s+rounds=[0-9]+)*'
-        replace: '\1 rounds={{ "65536" if (password_algorithm == "sha512") else "11" }}'
+        replace: '\1 rounds={{ "65536" if (password_algorithm == "sha512") else "8" }}'
         mode: "0644"
         owner: root
         group: root
diff --git a/templates/etc/pam.d/common-password.j2 b/templates/etc/pam.d/common-password.j2
index 5f85189..9d13203 100644
--- a/templates/etc/pam.d/common-password.j2
+++ b/templates/etc/pam.d/common-password.j2
@@ -2,6 +2,6 @@
 # Generated by Ansible role {{ ansible_role_name }}
 
 password requisite pam_pwquality.so retry=3
-password [success=1 default=ignore] pam_unix.so obscure use_authtok try_first_pass {{ password_algorithm }} rounds={{ '65536' if (password_algorithm == 'sha512') else '11' }} remember={{ password_remember }}
+password [success=1 default=ignore] pam_unix.so obscure use_authtok try_first_pass {{ password_algorithm }} rounds={{ '65536' if (password_algorithm == 'sha512') else '8' }} remember={{ password_remember }}
 password requisite pam_deny.so
 password required pam_permit.so

cleberb · 2023-10-20T22:05:09Z

The Set rounds task isn't idempotent on AlmaLinux.
Idempotence test failed because of the following tasks:
*  => ansible-role-hardening : Set rounds

Do you have any suggestions for this issue? the old regex for the remember parameter was removing extra predefined parameters.

    - name: Set system-auth remember
      ansible.builtin.replace:
        regexp: use_authtok(\s+.*)
        replace: use_authtok remember=5

cleberb · 2023-10-20T22:30:17Z

The Set rounds task isn't idempotent on AlmaLinux.
Idempotence test failed because of the following tasks:
*  => ansible-role-hardening : Set rounds
Do you have any suggestions for this issue? the old regex for the remember parameter was removing extra predefined parameters.
    - name: Set system-auth remember
      ansible.builtin.replace:
        regexp: use_authtok(\s+.*)
        replace: use_authtok remember=5

Anyway the regex is wrong:

--- before: /etc/pam.d/password-auth
+++ after: /etc/pam.d/password-auth
@@ -8,7 +8,7 @@
 account     required      pam_unix.so
 
 password    requisite     pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
-password    sufficient    pam_unix.so try_first_pass use_authtok sha512 remember=10 shadow rounds=65536
+password    sufficient    pam_unix.so try_first_pass use_authtok sha512 remember=10 rounds=65536 shadow rounds=65536

konstruktoid · 2023-10-21T10:17:02Z

-password    sufficient    pam_unix.so try_first_pass use_authtok sha512 remember=10 shadow rounds=65536
+password    sufficient    pam_unix.so try_first_pass use_authtok sha512 remember=10 rounds=65536 shadow rounds=65536

yeah, this is why the role need to be idempotent but I haven't had the time to dig deeper

cleberb · 2023-10-21T20:48:18Z

https://docs.ansible.com/ansible/latest/collections/community/general/pamd_module.html

Could using this module be an option? Do you have any observations?

konstruktoid · 2023-10-22T13:32:38Z

There are no issues with using that module. It just seems messy, but if you're okay with working with it

cleberb · 2023-10-23T13:51:19Z

I made a change to the regex, I believe the replace solved it, but I need you to perform the molecule test to see if it will be identified as idempotent.

konstruktoid · 2023-10-23T15:37:18Z

"Idempotence completed successfully."

konstruktoid · 2023-10-24T21:57:54Z

update the testing.
related: ansible/ansible#82071

diff --git a/molecule/default/verify.yml b/molecule/default/verify.yml
index 9e4fb37..f545b19 100644
--- a/molecule/default/verify.yml
+++ b/molecule/default/verify.yml
@@ -938,49 +938,46 @@
         - name: Create yescrypt password hash
           ansible.builtin.shell: |
             set -o pipefail
-            echo -n '{{ item }}' | mkpasswd --stdin --method=yescrypt --rounds=8
+            echo -n 'Ansible Role Test User' | mkpasswd --stdin --method=yescrypt --rounds=8
           args:
             executable: /bin/bash
           register: mkpasswd
           changed_when: false
           failed_when: mkpasswd.rc != 0
-          loop:
-            - 'Ansible Role Test User'
-            - 'Change Ansible Role Test User'
           when: password_algorithm == "yescrypt"
 
         - name: Set passwords
           ansible.builtin.set_fact:
-            passwords: "{{ mkpasswd.results | map(attribute='stdout') | list }}"
-          when:
-            - password_algorithm == "yescrypt"
-            - mkpasswd.rc == 0
+            passwords: "{{ mkpasswd.stdout }}"
+          when: password_algorithm == "yescrypt"
 
         - name: Create sha512 password hash
           vars:
             salt: "{{ lookup('password', '/dev/null chars=ascii_lowercase,ascii_uppercase,digits length=16') }}"
           ansible.builtin.set_fact:
-            passwords: "{{ passwords | default([]) | union([item | password_hash('sha512', salt, rounds=65536)]) }}"
-          loop:
-            - 'Ansible Role Test User'
-            - 'Change Ansible Role Test User'
+            passwords: "{{ 'Ansible Role Test User' | password_hash('sha512', salt, rounds=656000) }}"
           when: password_algorithm == "sha512"
 
+        - name: Print passwords
+          ansible.builtin.debug:
+            msg: "{{ passwords }}"
+          when: passwords
+
     - name: Create test user
       become: true
       ansible.builtin.user:
         name: roletestuser
-        password: "{{ passwords[0] }}"
+        password: "{{ passwords }}"
         state: present
         shell: /bin/bash
 
-    - name: Change test user password
+    - name: Get test user password
       become: true
-      ansible.builtin.user:
-        name: roletestuser
-        password: "{{ passwords[1] }}"
-      register: test_user_pass
+      ansible.builtin.command:
+        cmd: grep roletestuser /etc/shadow
+      register: roletestuser_pass
+      changed_when: false
 
-    - name: Debug test user password
+    - name: Print test user
       ansible.builtin.debug:
-        msg: "{{ test_user_pass }}"
+        msg: "{{ roletestuser_pass.stdout }}"

molecule/default/verify.yml

konstruktoid · 2023-10-25T22:45:43Z

Thanks again!

cleberb requested a review from konstruktoid as a code owner October 19, 2023 20:27

konstruktoid self-assigned this Oct 19, 2023

Fix package mkpasswd

d2ad1ad

Fix rounds for yescrypt

6b5d3aa

Fix regex for set rounds and remember

bc51546

Fix pwquality.dictpath

005f2d0

Update testing

79d2369

konstruktoid approved these changes Oct 25, 2023

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konstruktoid merged commit d1b2e5f into konstruktoid:master Oct 25, 2023

cleberb deleted the password_improvements branch October 26, 2023 00:56

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PASSWORD Improvements #421

PASSWORD Improvements #421

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PASSWORD Improvements #421

PASSWORD Improvements #421

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