community.general.postgresql_pg_hba – Add, remove or modify a rule in a pg_hba file

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Ansible/docs/2.10/collections/community/general/postgresql pg hba module


community.general.postgresql_pg_hba – Add, remove or modify a rule in a pg_hba file

Note

This plugin is part of the community.general collection (version 1.3.2).

To install it use: ansible-galaxy collection install community.general.

To use it in a playbook, specify: community.general.postgresql_pg_hba.


Synopsis

  • The fundamental function of the module is to create, or delete lines in pg_hba files.
  • The lines in the file should be in a typical pg_hba form and lines should be unique per key (type, databases, users, source). If they are not unique and the SID is ‘the one to change’, only one for state=present or none for state=absent of the SID’s will remain.

Requirements

The below requirements are needed on the host that executes this module.

  • ipaddress

Parameters

Parameter Choices/Defaults Comments

address

string

Default:

"samehost"

The source address/net where the connections could come from.

Will not be used for entries of type=local.

You can also use keywords all, samehost, and samenet.


aliases: source, src

attributes

string

added in 2.3 of ansible.builtin

The attributes the resulting file or directory should have.

To get supported flags look at the man page for chattr on the target system.

This string should contain the attributes in the same order as the one displayed by lsattr.

The = operator is assumed as default, otherwise + or - operators need to be included in the string.


aliases: attr

backup

boolean

  • no

  • yes

If set, create a backup of the pg_hba file before it is modified. The location of the backup is returned in the (backup) variable by this module.

backup_file

string

Write backup to a specific backupfile rather than a temp file.

contype

string

  • local
  • host
  • hostnossl
  • hostssl

Type of the rule. If not set, postgresql_pg_hba will only return contents.

create

boolean

  • no

  • yes

Create an pg_hba file if none exists.

When set to false, an error is raised when the pg_hba file doesn't exist.

databases

string

Default:

"all"

Databases this line applies to.

dest

path / required

Path to pg_hba file to modify.

group

string

Name of the group that should own the file/directory, as would be fed to chown.

method

string

  • cert
  • gss
  • ident
  • krb5
  • ldap
  • md5

  • pam
  • password
  • peer
  • radius
  • reject
  • scram-sha-256
  • sspi
  • trust

Authentication method to be used.

mode

raw

The permissions the resulting file or directory should have.

For those used to /usr/bin/chmod remember that modes are actually octal numbers. You must either add a leading zero so that Ansible's YAML parser knows it is an octal number (like 0644 or 01777) or quote it (like '644' or '1777') so Ansible receives a string and can do its own conversion from string into number.

Giving Ansible a number without following one of these rules will end up with a decimal number which will have unexpected results.

As of Ansible 1.8, the mode may be specified as a symbolic mode (for example, u+rwx or u=rw,g=r,o=r).

netmask

string

The netmask of the source address.

options

string

Additional options for the authentication method.

order

string

  • sdu

  • sud
  • dsu
  • dus
  • usd
  • uds

The entries will be written out in a specific order. With this option you can control by which field they are ordered first, second and last. s=source, d=databases, u=users. This option is deprecated since 2.9 and will be removed in community.general 3.0.0. Sortorder is now hardcoded to sdu.

owner

string

Name of the user that should own the file/directory, as would be fed to chown.

selevel

string

The level part of the SELinux file context.

This is the MLS/MCS attribute, sometimes known as the range.

When set to _default, it will use the level portion of the policy if available.

serole

string

The role part of the SELinux file context.

When set to _default, it will use the role portion of the policy if available.

setype

string

The type part of the SELinux file context.

When set to _default, it will use the type portion of the policy if available.

seuser

string

The user part of the SELinux file context.

By default it uses the system policy, where applicable.

When set to _default, it will use the user portion of the policy if available.

state

string

  • absent
  • present

The lines will be added/modified when state=present and removed when state=absent.

unsafe_writes

boolean

added in 2.2 of ansible.builtin

  • no

  • yes

Influence when to use atomic operation to prevent data corruption or inconsistent reads from the target file.

By default this module uses atomic operations to prevent data corruption or inconsistent reads from the target files, but sometimes systems are configured or just broken in ways that prevent this. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner.

This option allows Ansible to fall back to unsafe methods of updating files when atomic operations fail (however, it doesn't force Ansible to perform unsafe writes).

IMPORTANT! Unsafe writes are subject to race conditions and can lead to data corruption.

users

string

Default:

"all"

Users this line applies to.



Notes

Note

  • The default authentication assumes that on the host, you are either logging in as or sudo’ing to an account with appropriate permissions to read and modify the file.
  • This module also returns the pg_hba info. You can use this module to only retrieve it by only specifying dest. The info can be found in the returned data under key pg_hba, being a list, containing a dict per rule.
  • This module will sort resulting pg_hba files if a rule change is required. This could give unexpected results with manual created hba files, if it was improperly sorted. For example a rule was created for a net first and for a ip in that net range next. In that situation, the ‘ip specific rule’ will never hit, it is in the pg_hba file obsolete. After the pg_hba file is rewritten by the community.general.postgresql_pg_hba module, the ip specific rule will be sorted above the range rule. And then it will hit, which will give unexpected results.
  • With the ‘order’ parameter you can control which field is used to sort first, next and last.
  • The module supports a check mode and a diff mode.


See Also

See also

PostgreSQL pg_hba.conf file reference
Complete reference of the PostgreSQL pg_hba.conf file documentation.


Examples

- name: Grant users joe and simon access to databases sales and logistics from ipv6 localhost ::1/128 using peer authentication.
  community.general.postgresql_pg_hba:
    dest: /var/lib/postgres/data/pg_hba.conf
    contype: host
    users: joe,simon
    source: ::1
    databases: sales,logistics
    method: peer
    create: true

- name: Grant user replication from network 192.168.0.100/24 access for replication with client cert authentication.
  community.general.postgresql_pg_hba:
    dest: /var/lib/postgres/data/pg_hba.conf
    contype: host
    users: replication
    source: 192.168.0.100/24
    databases: replication
    method: cert

- name: Revoke access from local user mary on database mydb.
  community.general.postgresql_pg_hba:
    dest: /var/lib/postgres/data/pg_hba.conf
    contype: local
    users: mary
    databases: mydb
    state: absent

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key Returned Description

backup_file

string

changed

File that the original pg_hba file was backed up to


Sample:

/tmp/pg_hba_jxobj_p

msgs

list / elements=string

always

List of textual messages what was done


Sample:

{'msgs': ['Removing', 'Changed', 'Writing']}

pg_hba

list / elements=string

always

List of the pg_hba rules as they are configured in the specified hba file


Sample:

{'pg_hba': [{'db': 'all', 'method': 'md5', 'src': 'samehost', 'type': 'host', 'usr': 'all'}]}




Authors

  • Sebastiaan Mannem (@sebasmannem)

© 2012–2018 Michael DeHaan
© 2018–2019 Red Hat, Inc.
Licensed under the GNU General Public License version 3.
https://docs.ansible.com/ansible/2.10/collections/community/general/postgresql_pg_hba_module.html