Changeset - 24120c68c6b4
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Branko Majic (branko) - 8 months ago 2024-02-18 20:37:53
branko@majic.rs
MAR-196: Simplify allowed TLS protocol configuration for mail_server role:

- Accept minimum version allowed instead of arbitrary list.
- Fixes deprecation warnings in Dovecot logs (ssl_protocols ->
ssl_min_protocol transition).
8 files changed with 44 insertions and 16 deletions:
docs/releasenotes.rst
7
docs/rolereference.rst
5
6
roles/mail_server/defaults/main.yml
14
2
roles/mail_server/molecule/default/group_vars/parameters-optional.yml
1
3
roles/mail_server/molecule/default/tests/test_default.py
14
roles/mail_server/templates/99-local.conf.j2
1
1
roles/mail_server/templates/master.cf.j2
1
1
testsite/group_vars/mail.yml
1
3
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docs/releasenotes.rst
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@@ -42,6 +42,13 @@ Dropped support for Debian 10 (Buster).
 
    parameter expects a list of IPv4 and IPv6 addresses (or
 
    subnets). Resolvable names can no longer be specified.
 

			




	
	
	
		
 
* ``mail_server`` role

			




	
	
	
		
 

			




	
	
	
		
 
  * Parameter ``mail_server_tls_protocols`` has been dropped and

			




	
	
	
		
 
    replaced with parameter ``mail_server_minimum_tls_protocol``. Full

			




	
	
	
		
 
    list of TLS protocols can no longer be specified, only the minimum

			




	
	
	
		
 
    one.

			




	
	
	
		
 

			




	
	
	
		
 
* ``wsgi_website`` role

			




	
	
	
		
 

			




	
	
	
		
 
  * Dropped support for Python 2.7. Only Python 3 is supported now.

			




        

    


    
    

    

        

                

                    docs/rolereference.rst
                

                

                  
                      
                        

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@@ -1165,17 +1165,16 @@ Parameters

			




	
	
	
		
 
  advertised as part of SMTP server capabilities (in response to the

			




	
	
	
		
 
  ``ehlo`` SMTP command).

			




	
	
	
		
 

			




	
	
	
		
 
**mail_server_minimum_tls_protocol** (string, optional, ``"TLSv1.2"``)

			




	
	
	
		
 
  Minimum version of TLS protocol to allow when connecting to SMTP

			




	
	
	
		
 
  submission port or IMAP. Value should be compatible with Dovecot's

			




	
	
	
		
 
  ``ssl_protocols`` configuration option.

			




	
	
	
		
 

			




	
	
	
		
 
**mail_server_smtp_additional_configuration** (string, optional, ``""``))

			




	
	
	
		
 
  Additional configuration directives to include in SMTP server main

			




	
	
	
		
 
  configuration file. Directives must be specifically compatible with

			




	
	
	
		
 
  Postfix, and are treated verbatim (multi-line string will suffice).

			




	
	
	
		
 

			




	
	
	
		
 
**mail_server_tls_protocols** (list, optional, ``[ "TLSv1.2" ]``)

			




	
	
	
		
 
  List of TLS protocols the mail server should support. Each value specified

			




	
	
	
		
 
  should be compatible with Postfix configuration option

			




	
	
	
		
 
  ``smtpd_tls_mandatory_protocols`` and Dovecot configuration option

			




	
	
	
		
 
  ``ssl_protocols``.

			




	
	
	
		
 

			




	
	
	
		
 
**mail_server_tls_ciphers** (string, optional ``DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-CHACHA20-POLY1305:!aNULL:!MD5:!EXPORT``)

			




	
	
	
		
 
  TLS ciphers to enable on the mail server (for IMAP and SMTP submission). This

			




	
	
	
		
 
  should be an OpenSSL-compatible cipher specification. Value should be

			




        

    


    
    

    

        

                

                    roles/mail_server/defaults/main.yml
                

                

                  
                      
                        

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@@ -8,8 +8,7 @@ mail_postmaster: "postmaster@{{ ansible_domain }}"

			




	
	
	
		
 
smtp_allow_relay_from: []

			




	
	
	
		
 
local_mail_aliases: {}

			




	
	
	
		
 
imap_max_user_connections_per_ip: 10

			




	
	
	
		
 
mail_server_tls_protocols:

			




	
	
	
		
 
  - "TLSv1.2"

			




	
	
	
		
 
mail_server_minimum_tls_protocol: "TLSv1.2"

			




	
	
	
		
 
mail_server_tls_ciphers: "\

			




	
	
	
		
 
DHE-RSA-AES128-GCM-SHA256:\

			




	
	
	
		
 
DHE-RSA-AES256-GCM-SHA384:\

			




	
	
		
 
@@ -20,3 +19,16 @@ ECDHE-RSA-CHACHA20-POLY1305:\

			




	
	
	
		
 
!aNULL:!MD5:!EXPORT"

			




	
	
	
		
 
mail_message_size_limit: 10240000

			




	
	
	
		
 
mail_server_smtp_additional_configuration: ""

			




	
	
	
		
 

			




	
	
	
		
 
# Internal use only.

			




	
	
	
		
 

			




	
	
	
		
 
# Map Postfix smtpd allowed protocols based on minimum protocol

			




	
	
	
		
 
# specified (for use with submission port smtpd instance). A bit

			




	
	
	
		
 
# repetative, but easy to understand.

			




	
	
	
		
 
mail_server_smtpd_submission_protocols:

			




	
	
	
		
 
  SSLv2: ["SSLv2", "SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2", "TLSv1.3"]

			




	
	
	
		
 
  SSLv3: ["SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2", "TLSv1.3"]

			




	
	
	
		
 
  TLSv1: ["TLSv1", "TLSv1.1", "TLSv1.2", "TLSv1.3"]

			




	
	
	
		
 
  TLSv1.1: ["TLSv1.1", "TLSv1.2", "TLSv1.3"]

			




	
	
	
		
 
  TLSv1.2: ["TLSv1.2", "TLSv1.3"]

			




	
	
	
		
 
  TLSv1.3: ["TLSv1.3"]

			




        

    


    
    

    

        

                

                    roles/mail_server/molecule/default/group_vars/parameters-optional.yml
                

                

                  
                      
                        

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@@ -5,9 +5,7 @@ mail_ldap_url: ldap://ldap-server/

			




	
	
	
		
 
mail_ldap_tls_truststore: "{{ lookup('file', 'tests/data/x509/ca/chain-full.cert.pem') }}"

			




	
	
	
		
 
mail_ldap_postfix_password: postfixpassword

			




	
	
	
		
 
mail_ldap_dovecot_password: dovecotpassword

			




	
	
	
		
 
mail_server_tls_protocols:

			




	
	
	
		
 
  - TLSv1.2

			




	
	
	
		
 
  - TLSv1.1

			




	
	
	
		
 
mail_server_minimum_tls_protocol: TLSv1.1

			




	
	
	
		
 
mail_server_tls_ciphers: "DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-GCM-SHA384:\

			




	
	
	
		
 
DHE-RSA-AES256-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-GCM-SHA384:\

			




	
	
	
		
 
ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:!aNULL:!MD5:!EXPORT"

			




        

    


    
    

    

        

                

                    roles/mail_server/molecule/default/tests/test_default.py
                

                

                  
                      
                        

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@@ -705,3 +705,17 @@ def test_smtp_default_port_tls_version_and_ciphers(host):

			




	
	
	
		
 

			




	
	
	
		
 
    assert tls_versions == expected_tls_versions

			




	
	
	
		
 
    assert tls_ciphers == expected_tls_ciphers[distribution_release]

			




	
	
	
		
 

			




	
	
	
		
 

			




	
	
	
		
 
def test_dovecot_warnings(host):

			




	
	
	
		
 
    """

			




	
	
	
		
 
    Tests if Dovecot is reporting any warnings.

			




	
	
	
		
 
    """

			




	
	
	
		
 

			




	
	
	
		
 
    with host.sudo():

			




	
	
	
		
 

			




	
	
	
		
 
        # Use invocation ID to get service logs since last restart.

			




	
	
	
		
 
        invocation_id = host.run("systemctl show -p InvocationID --value dovecot").stdout.strip()

			




	
	
	
		
 
        invocation_logs = host.run("journalctl INVOCATION_ID=%s + _SYSTEMD_INVOCATION_ID=%s", invocation_id, invocation_id)

			




	
	
	
		
 

			




	
	
	
		
 
        assert "doveconf: Warning" not in invocation_logs.stdout

			




        

    


    
    

    

        

                

                    roles/mail_server/templates/99-local.conf.j2
                

                

                  
                      
                        

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@@ -32,7 +32,7 @@ service auth {

			




	
	
	
		
 
ssl_cert = </etc/ssl/certs/{{ ansible_fqdn }}_imap.pem

			




	
	
	
		
 
ssl_key = </etc/ssl/private/{{ ansible_fqdn }}_imap.key

			




	
	
	
		
 
ssl_dh=</etc/ssl/private/{{ inventory_hostname }}_imap.dh.pem

			




	
	
	
		
 
ssl_protocols = {{ mail_server_tls_protocols | join(' ') }}

			




	
	
	
		
 
ssl_min_protocol = {{ mail_server_minimum_tls_protocol }}

			




	
	
	
		
 
ssl_cipher_list = {{ mail_server_tls_ciphers }}

			




	
	
	
		
 
ssl = required

			




	
	
	
		
 

			




        

    


    
    

    

        

                

                    roles/mail_server/templates/master.cf.j2
                

                

                  
                      
                        

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@@ -133,6 +133,6 @@ submission inet n       -       y       -       -       smtpd

			




	
	
	
		
 
  -o smtpd_tls_auth_only=yes

			




	
	
	
		
 
  -o smtpd_recipient_restrictions=

			




	
	
	
		
 
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject

			




	
	
	
		
 
  -o smtpd_tls_mandatory_protocols={{ mail_server_tls_protocols | join(',') }}

			




	
	
	
		
 
  -o smtpd_tls_mandatory_protocols={{ mail_server_smtpd_submission_protocols[mail_server_minimum_tls_protocol] | join(',') }}

			




	
	
	
		
 
  -o smtpd_tls_mandatory_ciphers=high

			




	
	
	
		
 
  -o tls_high_cipherlist={{ mail_server_tls_ciphers }}

			




        

    


    
    

    

        

                

                    testsite/group_vars/mail.yml
                

                

                  
                      
                        

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@@ -32,9 +32,7 @@ smtp_allow_relay_from:

			




	
	
	
		
 

			




	
	
	
		
 
imap_max_user_connections_per_ip: 50

			




	
	
	
		
 

			




	
	
	
		
 
mail_server_tls_protocols:

			




	
	
	
		
 
  - TLSv1.2

			




	
	
	
		
 
  - TLSv1.1

			




	
	
	
		
 
mail_server_minimum_tls_protocol: TLSv1.1

			




	
	
	
		
 

			




	
	
	
		
 
mail_server_tls_ciphers: "DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-GCM-SHA384:\

			




	
	
	
		
 
DHE-RSA-AES256-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-GCM-SHA384:\

			




        

    



    


    



    



      

      





    
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