Table of Contents
This NixOS module is a block that implements the SSL certificate generator contract.
It is implemented by:
shb.certs.cas.selfsigned and shb.certs.certs.selfsigned: Generates self-signed certificates,
including self-signed CA thanks to the certtool package.
shb.certs.certs.letsencrypt: Requests certificates from Let’s Encrypt.
Defined in /modules/blocks/ssl.nix.
To use self-signed certificates, we must first generate at least one Certificate Authority (CA):
shb.certs.cas.selfsigned.myca = {
name = "My CA";
};
Every CA defined this way will be concatenated into the file /etc/ssl/certs/ca-certificates.cert
which means those CAs and all certificates generated by those CAs will be automatically trusted.
We can then generate one or more certificates signed by that CA:
shb.certs.certs.selfsigned = {
"example.com" = {
ca = config.shb.certs.cas.selfsigned.myca;
domain = "example.com";
group = "nginx";
reloadServices = [ "nginx.service" ];
};
"www.example.com" = {
ca = config.shb.certs.cas.selfsigned.myca;
domain = "www.example.com";
group = "nginx";
};
};
The group has been chosen to be nginx to be consistent with the examples further down in this
document.
Defined in /modules/blocks/ssl.nix.
We can ask Let’s Encrypt to generate a certificate with:
shb.certs.certs.letsencrypt."example.com" = {
domain = "example.com";
group = "nginx";
dnsProvider = "linode";
adminEmail = "admin@example.com";
credentialsFile = /path/to/secret/file;
additionalEnvironment = {
LINODE_HTTP_TIMEOUT = "10";
LINODE_POLLING_INTERVAL = "10";
LINODE_PROPAGATION_TIMEOUT = "240";
};
};
The credential file’s content would be a key-value pair:
LINODE_TOKEN=XYZ...
For other providers, see the official instruction.
To use either a self-signed certificates or a Let’s Encrypt generated one, we can reference the path where the certificate and the private key are located:
config.shb.certs.certs.<implementation>.<name>.paths.cert
config.shb.certs.certs.<implementation>.<name>.paths.key
config.shb.certs.certs.<implementation>.<name>.systemdService
For example:
config.shb.certs.certs.selfsigned."example.com".paths.cert
config.shb.certs.certs.selfsigned."example.com".paths.key
config.shb.certs.certs.selfsigned."example.com".systemdService
The full CA bundle is generated by the following Systemd service, running after each individual generator finished:
config.shb.certs.systemdService
See also the SSL certificate generator usage for a more detailed usage example.
Each CA and Cert is generated by a systemd service whose name can be seen in the systemdService
option. You can then see the latest errors messages using journalctl.
The self-signed implementation is tested in /tests/vm/ssl.nix.
shb.certs.cas.selfsigned
Generate a self-signed Certificate Authority.
Type: attribute set of (submodule)
Default:
{ }
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.cas.selfsigned.<name>.name
Certificate Authority Name. You can put what you want here, it will be displayed by the browser.
Type: string
Default:
"Self Host Blocks Certificate"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.cas.selfsigned.<name>.paths
Paths where CA certs will be located.
This option implements the SSL Generator contract.
Type: anything
Default:
{
cert = "/var/lib/certs/cas/‹name›.cert";
key = "/var/lib/certs/cas/‹name›.key";
}
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.cas.selfsigned.<name>.paths.cert
Path to the cert file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.cas.selfsigned.<name>.paths.key
Path to the key file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.cas.selfsigned.<name>.systemdService
Systemd oneshot service used to generate the certs.
This option implements the SSL Generator contract.
Type: string
Default:
"shb-certs-ca-‹name›.service"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt
Generate certificates signed by Let’s Encrypt.
Type: attribute set of (submodule)
Default:
{ }
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.additionalEnvironment
Additional environment variables used to configure the DNS provider.
For secrets, use shb.ssl.credentialsFile instead.
See the chosen provider’s documentation for available options.
Type: attribute set of string
Example:
{
DNSPROVIDER_TIMEOUT = "10";
DNSPROVIDER_PROPAGATION_TIMEOUT = "240";
}
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.adminEmail
Admin email in case certificate retrieval goes wrong.
Type: string
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.credentialsFile
Credentials file location for the chosen DNS provider.
The content of this file must expose environment variables as written in the documentation of each DNS provider.
For example, if the documentation says the credential must be located in the environment variable DNSPROVIDER_TOKEN, then the file content must be:
DNSPROVIDER_TOKEN=xyz
You can put non-secret environment variables here too or use shb.ssl.additionalcfg instead.
Type: null or path
Default:
null
Example:
"/run/secrets/ssl"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.debug
Enable debug logging
Type: boolean
Default:
false
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.dnsProvider
DNS provider to use. See https://go-acme.github.io/lego/dns/ for the list of supported providers.
Type: null or string
Default:
null
Example:
"linode"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.dnsResolver
IP of a DNS server used to resolve hostnames.
Type: string
Default:
"8.8.8.8"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.domain
Domain to generate a certificate for. This can be a wildcard domain like
*.example.com.
Type: string
Example:
"example.com"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.extraDomains
Other domains to generate a certificate for.
Type: list of string
Default:
[ ]
Example:
[
"sub1.example.com"
"sub2.example.com"
]
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.group
Unix group owning this certificate.
Type: null or string
Default:
"acme"
Example:
"nginx"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.makeAvailableToUser
Make all certificates available to given user.
Type: null or string
Default:
null
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.paths
Paths where certs will be located.
This option implements the SSL Generator contract.
Type: anything
Default:
{
cert = "/var/lib/acme/‹name›/cert.pem";
key = "/var/lib/acme/‹name›/key.pem";
}
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.paths.cert
Path to the cert file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.paths.key
Path to the key file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.reloadServices
The list of systemd services to call systemctl try-reload-or-restart on.
Type: list of string
Default:
[ ]
Example:
[
"nginx.service"
]
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.letsencrypt.<name>.systemdService
Systemd oneshot service used to generate the certs.
This option implements the SSL Generator contract.
Type: string
Default:
"shb-certs-cert-letsencrypt-‹name›.service"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned
Generate self-signed certificates signed by a Certificate Authority.
Type: attribute set of (submodule)
Default:
{ }
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.ca
CA used to generate this certificate. Only used for self-signed.
This contract input takes the contract output of the shb.certs.cas SSL block.
Type: null or (anything)
Default:
null
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.ca.paths
Paths where the files for the CA will be located.
This option is the contract output of the shb.certs.cas SSL block.
Type: anything
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.ca.paths.cert
Path to the cert file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.ca.paths.key
Path to the key file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.ca.systemdService
Systemd oneshot service used to generate the CA. Ends with the .service suffix.
Use this if downstream services must wait for the certificates to be generated before starting.
Type: string
Example:
"ca-generator.service"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.domain
Domain to generate a certificate for. This can be a wildcard domain like
*.example.com.
Type: string
Example:
"example.com"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.extraDomains
Other domains to generate a certificate for.
Type: list of string
Default:
[ ]
Example:
[
"sub1.example.com"
"sub2.example.com"
]
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.group
Unix group owning this certificate.
Type: string
Default:
"root"
Example:
"nginx"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.paths
Paths where certs will be located.
This option implements the SSL Generator contract.
Type: anything
Default:
{
cert = "/var/lib/certs/selfsigned/‹name›.cert";
key = "/var/lib/certs/selfsigned/‹name›.key";
}
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.paths.cert
Path to the cert file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.paths.key
Path to the key file.
Type: path
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.reloadServices
The list of systemd services to call systemctl try-reload-or-restart on.
Type: list of string
Default:
[ ]
Example:
[
"nginx.service"
]
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.certs.selfsigned.<name>.systemdService
Systemd oneshot service used to generate the certs.
This option implements the SSL Generator contract.
Type: string
Default:
"shb-certs-cert-selfsigned-‹name›.service"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|
shb.certs.systemdService
Systemd oneshot service used to generate the Certificate Authority bundle.
Type: string
Default:
"shb-ca-bundle.service"
Declared by:
<selfhostblocks/modules/blocks/ssl.nix>
|