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Creating Certificate Authorities (CAs)

  4 minute read.

Last Modified 2022-05-09 15:05 EDT

TrueNAS can act as a Certificate Authority (CA). When encrypting SSL or TLS connections to the TrueNAS system, you can import an existing CA or create a CA and certificate on the TrueNAS system. The certificate will appear in the drop-down menus for services that support SSL or TLS.

Go to System > CAs and click ADD. Name the CA, then choose the Type. The three type options are Internal CA, Intermediate CA, and Import CA. The process for each type is slightly different.

Internal CA

Identifier and Type

Set Internal CA as the Type.

You can select a profile for the CA to auto-fill options like Key Type, Key Length, Digest Algorithm. Otherwise, you must set options manually.

Internal CA Identifier Type

Certificate Options

  1. Select a Key Type from the drop-down. We recommend the RSA key type.
  2. Select the Key Length. We recommend a minimum of 2048 for security reasons.
  3. Select a Digest Algorithm. We recommend SHA256.
  4. Enter the Lifetime of the CA in days to set how long the CA will remain valid.

Internal CA Certificate Options

Certificate Subject

  1. Fill out the geographic information by entering the Country, Locality, Organizational Unit (optional), Common Name, State, Organization, Email, and Subject Alternate Names.
  2. The Common Name is the fully-qualified hostname (FQDN) and must be unique within a certificate chain.

SMBShareOpts

Basic Constraints

  1. If you would like to have Basic Constraints, set Enabled to see more options.
  2. Set a Path Length to determine how many non-self-issued intermediate certificates can follow the certificate in a valid certification path. Entering 0 allows a single additional certificate to follow in the certificate path.
  3. Select one or more Basic Constraints Configs.

Internal CA Basic Constraints

Authority Key Identifier

If you want an Authority Key Identifier, set it to Enabled, then select one or more Authority Key Configs.

Internal CA Authority Key Identifier

Key Usage

TrueNAS uses Extended Key Usage for end-entity certificates.

  1. If you want to utilize Extended Key Usage, set it to Enabled, then select one or more usages for the public key from the Usages drop-down.
  2. Enable Critical Extension if you want to identify this extension as critical for the certificate. Do not enable Critical Extension if Usages contains ANY_EXTENDED_KEY_USAGE.
Using Extended Key Usage and Key Usage extensions requires that the certificate purpose is consistent with both extensions. See RFC 3280, section 4.2.1.13 for more details.

Internal Certificate Key Usage

Intermediate CA

Identifier and Type

Select Intermediate CA as the Type.

You can select a profile for the CA to auto-fill options like Key Type, Key Length, Digest Algorithm. Otherwise, you must set options manually.

Intermediate CA Identifier Type

Certificate Options

  1. Select a Signing Certificate Authority from the drop-down.
  2. Select a Key Type from the drop-down. We recommend the RSA key type.
  3. Select the Key Length. We recommend a minimum of 2048 for security reasons.
  4. Select a Digest Algorithm. We recommend SHA256.
  5. Enter the Lifetime of the CA in days to set how long the CA will remain valid.

Intermediate CA Certificate Options

Certificate Subject

  1. Fill out the geographic information by entering the Country, Locality, Organizational Unit (optional), Common Name, State, Organization, Email, and Subject Alternate Names.
  2. The Common Name is the fully-qualified hostname (FQDN) and must be unique within a certificate chain.

Intermediate CA Certificate Subject

Basic Constraints

  1. If you would like to have Basic Constraints, set Enabled to see more options.
  2. Set a Path Length to determine how many non-self-issued intermediate certificates can follow the certificate in a valid certification path. Entering 0 allows a single additional certificate to follow in the certificate path.
  3. Select one or more Basic Constraints Configs.

Internal CA Basic Constraints

Authority Key Identifier

If you want an Authority Key Identifier, set it to Enabled, then select one or more Authority Key Configs.

Internal CA Authority Key Identifier

Key Usage

TrueNAS uses Extended Key Usage for end-entity certificates.

  1. If you want to utilize Extended Key Usage, set it to Enabled, then select one or more usages for the public key from the Usages drop-down.
  2. Enable Critical Extension if you want to identify this extension as critical for the certificate. Do not enable Critical Extension if Usages contains ANY_EXTENDED_KEY_USAGE.
Using Extended Key Usage and Key Usage extensions requires that the certificate purpose is consistent with both extensions. See RFC 3280, section 4.2.1.13 for more details.

Import CA

Identifier and Type

Select Import a CA as the Type.

Import CA Identifier Type

Certificate Subject

  1. Copy the certificate for the CA you want to import and paste it into the Certificate field.
  2. Paste the certificate Private Key when available. Provide a key at least 1024 bits long.
  3. Enter and confirm the Private Key Passphrase.

Import CA Certificate Subject