| podman-image-trust(1) | General Commands Manual | podman-image-trust(1) |
NAME¶
podman-image-trust - Manage container registry image trust policy
SYNOPSIS¶
podman image trust set|show [options] registry[/repository]
DESCRIPTION¶
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:
- Defined to an entire registry.
- Defined to a particular repository in that registry.
- 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 (“signedBy”), Require a sigstore signature ("sigstoreSigned").
Trust may be updated using the command podman image trust set for an existing trust scope.
OPTIONS¶
--help, -h¶
Print usage statement.
set OPTIONS¶
--pubkeysfile, -f=KEY1¶
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.
--type, -t=value¶
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
show OPTIONS¶
--json, -j¶
Output trust as JSON for machine parsing
--noheading, -n¶
Omit the table headings from the listing.
--raw¶
Output trust policy file as raw JSON
EXAMPLES¶
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 security@redhat.com https://access.redhat.com/webassets/docker/content/sigstore repository registry.redhat.io signed security@redhat.com 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": "security@redhat.com"
},
{
"transport": "repository",
"name": "registry.redhat.io",
"repo_name": "registry.redhat.io",
"sigstore": "https://registry.redhat.io/containers/sigstore",
"type": "signed",
"gpg_id": "security@redhat.com"
},
{
"transport": "docker-daemon",
"type": "accept"
} ]
SEE ALSO¶
HISTORY¶
January 2019, updated by Tom Sweeney (tsweeney at redhat dot com) December 2018, originally compiled by Qi Wang (qiwan at redhat dot com)