podman-image-trust - Manage container registry image trust policy
podman image trust set|show [options] registry[/repository]
Manages which registries to trust as a source of container images based on its location. (This option is not available with the remote Podman client, including Mac and Windows (excluding WSL2) machines)
The location is determined by the transport and the registry host of the image. Using this container image docker://docker.io/library/busybox as an example, docker is the transport and docker.io is the registry host.
Trust is defined in /etc/containers/policy.json and is enforced when a user attempts to pull a remote image from a registry. The trust policy in policy.json describes a registry scope (registry and/or repository) for the trust. This trust can use public keys for signed images.
The scope of the trust is evaluated from most specific to the least specific. In other words, a policy may be:
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Defined to an entire registry. |
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Defined to a particular repository in that registry. |
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Defined to a specific signed image inside of the registry. |
The following list are examples of valid scope values used in policy.json from most specific to the least specific:
docker.io/library/busybox:notlatest
docker.io/library/busybox
docker.io/library
docker.io
If no configuration is found for any of these scopes, the default value (specified by using "default" instead of REGISTRY[/REPOSITORY]) is used.
Trust type provides a way to:
Allowlist ("accept") or Denylist ("reject") registries or Require a simple signing signature (âsignedByâ), Require a sigstore signature ("sigstoreSigned").
Trust may be updated using the command podman image trust set for an existing trust scope.
Print usage statement.
A path to an
exported public key on the local system. Key paths
are referenced in policy.json. Any path to a file may be
used but locating the file in /etc/pki/containers is
recommended. Options may be used multiple times to
require an image be signed by multiple keys. The
--pubkeysfile option is required for the
signedBy and sigstoreSigned types.
The trust type
for this policy entry.
Accepted values:
signedBy (default): Require simple signing signatures
with corresponding list of
public keys
sigstoreSigned: Require sigstore signatures with
corresponding list of
public keys
accept: do not require any signatures for this
registry scope
reject: do not accept images for this registry scope
Output trust as JSON for machine parsing
Omit the table headings from the listing.
Output trust policy file as raw JSON
Accept all unsigned images from a registry
sudo podman image trust set --type accept docker.io
Modify default trust policy
sudo podman image trust set -t reject default
Display system trust policy
podman image trust show
TRANSPORT NAME
TYPE ID STORE
all default reject
repository docker.io/library accept
repository registry.access.redhat.com signed
[email protected]
https://access.redhat.com/webassets/docker/content/sigstore
repository registry.redhat.io signed [email protected]
https://registry.redhat.io/containers/sigstore
repository docker.io reject
docker-daemon accept
Display trust policy file
podman image trust show --raw
{
"default": [
{
"type": "reject"
}
],
"transports": {
"docker": {
"docker.io": [
{
"type": "reject"
}
],
"docker.io/library": [
{
"type": "insecureAcceptAnything"
}
],
"registry.access.redhat.com": [
{
"type": "signedBy",
"keyType": "GPGKeys",
"keyPath":
"/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release"
}
],
"registry.redhat.io": [
{
"type": "signedBy",
"keyType": "GPGKeys",
"keyPath":
"/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release"
}
]
},
"docker-daemon": {
"": [
{
"type": "insecureAcceptAnything"
}
]
}
}
}
Display trust as JSON
podman image trust show --json
[
{
"transport": "all",
"name": "* (default)",
"repo_name": "default",
"type": "reject"
},
{
"transport": "repository",
"name": "docker.io",
"repo_name": "docker.io",
"type": "reject"
},
{
"transport": "repository",
"name": "docker.io/library",
"repo_name": "docker.io/library",
"type": "accept"
},
{
"transport": "repository",
"name": "registry.access.redhat.com",
"repo_name":
"registry.access.redhat.com",
"sigstore":
"https://access.redhat.com/webassets/docker/content/sigstore",
"type": "signed",
"gpg_id": "[email protected]"
},
{
"transport": "repository",
"name": "registry.redhat.io",
"repo_name": "registry.redhat.io",
"sigstore":
"https://registry.redhat.io/containers/sigstore",
"type": "signed",
"gpg_id": "[email protected]"
},
{
"transport": "docker-daemon",
"type": "accept"
}
]
containers-policy.json(5)
January 2019, updated by Tom Sweeney (tsweeney at redhat dot com) December 2018, originally compiled by Qi Wang (qiwan at redhat dot com)