certificate_complete_chain – Complete certificate chain given a set of untrusted and root certificates

New in version 2.7.

Synopsis

  • This module completes a given chain of certificates in PEM format by finding intermediate certificates from a given set of certificates, until it finds a root certificate in another given set of certificates.
  • This can for example be used to find the root certificate for a certificate chain returned by acme_certificate.
  • Note that this module does not check for validity of the chains. It only checks that issuer and subject match, and that the signature is correct. It ignores validity dates and key usage completely. If you need to verify that a generated chain is valid, please use openssl verify ....

Requirements

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

  • cryptography >= 1.5

Parameters

Parameter Choices/Defaults Comments
input_chain
string / required
A concatenated set of certificates in PEM format forming a chain.
The module will try to complete this chain.
intermediate_certificates
list
Default:
[]
A list of filenames or directories.
A filename is assumed to point to a file containing one or more certificates in PEM format. All certificates in this file will be added to the set of root certificates.
If a directory name is given, all files in the directory and its subdirectories will be scanned and tried to be parsed as concatenated certificates in PEM format.
Symbolic links will be followed.
root_certificates
list / required
A list of filenames or directories.
A filename is assumed to point to a file containing one or more certificates in PEM format. All certificates in this file will be added to the set of root certificates.
If a directory name is given, all files in the directory and its subdirectories will be scanned and tried to be parsed as concatenated certificates in PEM format.
Symbolic links will be followed.

Examples

# Given a leaf certificate for www.ansible.com and one or more intermediate
# certificates, finds the associated root certificate.
- name: Find root certificate
  certificate_complete_chain:
    input_chain: "{{ lookup('file', '/etc/ssl/csr/www.ansible.com-fullchain.pem') }}"
    root_certificates:
    - /etc/ca-certificates/
  register: www_ansible_com
- name: Write root certificate to disk
  copy:
    dest: /etc/ssl/csr/www.ansible.com-root.pem
    content: "{{ www_ansible_com.root }}"

# Given a leaf certificate for www.ansible.com, and a list of intermediate
# certificates, finds the associated root certificate.
- name: Find root certificate
  certificate_complete_chain:
    input_chain: "{{ lookup('file', '/etc/ssl/csr/www.ansible.com.pem') }}"
    intermediate_certificates:
    - /etc/ssl/csr/www.ansible.com-chain.pem
    root_certificates:
    - /etc/ca-certificates/
  register: www_ansible_com
- name: Write complete chain to disk
  copy:
    dest: /etc/ssl/csr/www.ansible.com-completechain.pem
    content: "{{ ''.join(www_ansible_com.complete_chain) }}"
- name: Write root chain (intermediates and root) to disk
  copy:
    dest: /etc/ssl/csr/www.ansible.com-rootchain.pem
    content: "{{ ''.join(www_ansible_com.chain) }}"

Return Values

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

Key Returned Description
chain
list
success
The chain added to the given input chain. Includes the root certificate.
Returned as a list of PEM certificates.

complete_chain
list
success
The completed chain, including leaf, all intermediates, and root.
Returned as a list of PEM certificates.

root
string
success
The root certificate in PEM format.



Status

Authors

  • Felix Fontein (@felixfontein)

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