Provided by: podman_4.3.1+ds1-8ubuntu1_amd64 
NAME
podman-image-trust - Manage container registry image trust policy
SYNOPSIS
podman image trust set|show [options] registry[/repository]
DESCRIPTION
Manages which registries you 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 for an entire registry. Or it could be defined for a
particular repository in that registry. Or it could be defined down to a specific signed
image inside of the registry.
For example, the following list includes valid scope values that could be 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
will be 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 trust listings
--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
containers-policy.json(5)
HISTORY
January 2019, updated by Tom Sweeney (tsweeney at redhat dot com) December 2018,
originally compiled by Qi Wang (qiwan at redhat dot com)
podman-image-trust(1)