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Merge pull request #23513 from mansinahar/update-content-trust-doc

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Change content-trust doc to not point to images that don't exist #22730
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Sebastiaan van Stijn 2016-07-11 23:42:53 +02:00 • committed by GitHub
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108
docs/security/trust/content_trust.md
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@ -130,7 +130,14 @@ read how to [manage keys for content trust](trust_key_mng.md).
## Survey of typical content trust operations ## Survey of typical content trust operations
This section surveys the typical trusted operations users perform with Docker This section surveys the typical trusted operations users perform with Docker
images. images. Specifically, we will be going through the following steps to help us exercise
these various trusted operations:
* Build and push an unsigned image
* Pull an unsigned image
* Build and push a signed image
* Pull the signed image pushed above
* Pull unsigned image pushed above
### Enable and disable content trust per-shell or per-invocation ### Enable and disable content trust per-shell or per-invocation
@ -152,14 +159,36 @@ In an environment where `DOCKER_CONTENT_TRUST` is set, you can use the
`--disable-content-trust` flag to run individual operations on tagged images `--disable-content-trust` flag to run individual operations on tagged images
without content trust on an as-needed basis. without content trust on an as-needed basis.
```bash Consider the following Dockerfile that uses an untrusted base image:
$ docker pull --disable-content-trust docker/trusttest:untrusted
```
$ cat Dockerfile
FROM docker/trusttest:latest
RUN echo
```
In order to build a container successfully using this Dockerfile, one can do:
```
$ docker build --disable-content-trust -t <username>/nottrusttest:latest .
Sending build context to Docker daemon 42.84 MB
...
Successfully built f21b872447dc
```
The same is true for all the other commands, such as `pull` and `push`:
```
$ docker pull --disable-content-trust docker/trusttest:latest
...
$ docker push --disable-content-trust <username>/nottrusttest:latest
...
``` ```
To invoke a command with content trust enabled regardless of whether or how the `DOCKER_CONTENT_TRUST` variable is set: To invoke a command with content trust enabled regardless of whether or how the `DOCKER_CONTENT_TRUST` variable is set:
```bash ```bash
$ docker build --disable-content-trust=false -t docker/trusttest:testing . $ docker build --disable-content-trust=false -t <username>/trusttest:testing .
``` ```
All of the trusted operations support the `--disable-content-trust` flag. All of the trusted operations support the `--disable-content-trust` flag.
@ -172,8 +201,8 @@ and push a tagged image. If this is the first time you have pushed an image
using content trust on your system, the session looks like this: using content trust on your system, the session looks like this:
```bash ```bash
$ docker push docker/trusttest:latest $ docker push <username>/trusttest:testing
The push refers to a repository [docker.io/docker/trusttest] (len: 1) The push refers to a repository [docker.io/<username>/trusttest] (len: 1)
9a61b6b1315e: Image already exists 9a61b6b1315e: Image already exists
902b87aaaec9: Image already exists 902b87aaaec9: Image already exists
latest: digest: sha256:d02adacee0ac7a5be140adb94fa1dae64f4e71a68696e7f8e7cbf9db8dd49418 size: 3220 latest: digest: sha256:d02adacee0ac7a5be140adb94fa1dae64f4e71a68696e7f8e7cbf9db8dd49418 size: 3220
@ -186,9 +215,9 @@ password manager to generate the passphrase and keep it safe. There will be no
way to recover this key. You can find the key in your config directory. way to recover this key. You can find the key in your config directory.
Enter passphrase for new root key with id a1d96fb: Enter passphrase for new root key with id a1d96fb:
Repeat passphrase for new root key with id a1d96fb: Repeat passphrase for new root key with id a1d96fb:
Enter passphrase for new repository key with id docker.io/docker/trusttest (3a932f1): Enter passphrase for new repository key with id docker.io/<username>/trusttest (3a932f1):
Repeat passphrase for new repository key with id docker.io/docker/trusttest (3a932f1): Repeat passphrase for new repository key with id docker.io/<username>/trusttest (3a932f1):
Finished initializing "docker.io/docker/trusttest" Finished initializing "docker.io/<username>/trusttest"
``` ```
When you push your first tagged image with content trust enabled, the `docker` When you push your first tagged image with content trust enabled, the `docker`
client recognizes this is your first push and: client recognizes this is your first push and:
@ -202,12 +231,12 @@ client recognizes this is your first push and:
The passphrase you chose for both the root key and your repository key-pair The passphrase you chose for both the root key and your repository key-pair
should be randomly generated and stored in a *password manager*. should be randomly generated and stored in a *password manager*.
> **NOTE**: If you omit the `latest` tag, content trust is skipped. This is true > **NOTE**: If you omit the `testing` tag, content trust is skipped. This is true
even if content trust is enabled and even if this is your first push. even if content trust is enabled and even if this is your first push.
```bash ```bash
$ docker push docker/trusttest $ docker push <username>/trusttest
The push refers to a repository [docker.io/docker/trusttest] (len: 1) The push refers to a repository [docker.io/<username>/trusttest] (len: 1)
9a61b6b1315e: Image successfully pushed 9a61b6b1315e: Image successfully pushed
902b87aaaec9: Image successfully pushed 902b87aaaec9: Image successfully pushed
latest: digest: sha256:a9a9c4402604b703bed1c847f6d85faac97686e48c579bd9c3b0fa6694a398fc size: 3220 latest: digest: sha256:a9a9c4402604b703bed1c847f6d85faac97686e48c579bd9c3b0fa6694a398fc size: 3220
@ -221,16 +250,16 @@ Once you have a root key on your system, subsequent images repositories
you create can use that same root key: you create can use that same root key:
```bash ```bash
$ docker push docker.io/docker/seaside:latest $ docker push docker.io/<username>/otherimage:latest
The push refers to a repository [docker.io/docker/seaside] (len: 1) The push refers to a repository [docker.io/<username>/otherimage] (len: 1)
a9539b34a6ab: Image successfully pushed a9539b34a6ab: Image successfully pushed
b3dbab3810fc: Image successfully pushed b3dbab3810fc: Image successfully pushed
latest: digest: sha256:d2ba1e603661a59940bfad7072eba698b79a8b20ccbb4e3bfb6f9e367ea43939 size: 3346 latest: digest: sha256:d2ba1e603661a59940bfad7072eba698b79a8b20ccbb4e3bfb6f9e367ea43939 size: 3346
Signing and pushing trust metadata Signing and pushing trust metadata
Enter key passphrase for root key with id a1d96fb: Enter key passphrase for root key with id a1d96fb:
Enter passphrase for new repository key with id docker.io/docker/seaside (bb045e3): Enter passphrase for new repository key with id docker.io/<username>/otherimage (bb045e3):
Repeat passphrase for new repository key with id docker.io/docker/seaside (bb045e3): Repeat passphrase for new repository key with id docker.io/<username>/otherimage (bb045e3):
Finished initializing "docker.io/docker/seaside" Finished initializing "docker.io/<username>/otherimage"
``` ```
The new image has its own repository key and timestamp key. The `latest` tag is signed with both of The new image has its own repository key and timestamp key. The `latest` tag is signed with both of
@ -240,54 +269,27 @@ these.
### Pull image content ### Pull image content
A common way to consume an image is to `pull` it. With content trust enabled, the Docker A common way to consume an image is to `pull` it. With content trust enabled, the Docker
client only allows `docker pull` to retrieve signed images. client only allows `docker pull` to retrieve signed images. Let's try to pull the image
you signed and pushed earlier:
``` ```
$ docker pull docker/seaside $ docker pull <username>/trusttest:testing
Using default tag: latest Using default tag: latest
Pull (1 of 1): docker/trusttest:latest@sha256:d149ab53f871 Pull (1 of 1): <username>/trusttest:testing@sha256:d149ab53f871
... ...
Tagging docker/trusttest@sha256:d149ab53f871 as docker/trusttest:latest Tagging <username>/trusttest@sha256:d149ab53f871 as docker/trusttest:testing
``` ```
The `seaside:latest` image is signed. In the following example, the command does not specify a tag, so the system uses In the following example, the command does not specify a tag, so the system uses
the `latest` tag by default again and the `docker/cliffs:latest` tag is not signed. the `latest` tag by default again and the `docker/trusttest:latest` tag is not signed.
```bash ```bash
$ docker pull docker/cliffs $ docker pull docker/trusttest
Using default tag: latest Using default tag: latest
no trust data available no trust data available
``` ```
Because the tag `docker/cliffs:latest` is not trusted, the `pull` fails. Because the tag `docker/trusttest:latest` is not trusted, the `pull` fails.
### Disable content trust for specific operations
A user who wants to disable content trust for a particular operation can use the
`--disable-content-trust` flag. **Warning: this flag disables content trust for
this operation**. With this flag, Docker will ignore content-trust and allow all
operations to be done without verifying any signatures. If we wanted the
previous untrusted build to succeed we could do:
```
$ cat Dockerfile
FROM docker/trusttest:notrust
RUN echo
$ docker build --disable-content-trust -t docker/trusttest:testing .
Sending build context to Docker daemon 42.84 MB
...
Successfully built f21b872447dc
```
The same is true for all the other commands, such as `pull` and `push`:
```
$ docker pull --disable-content-trust docker/trusttest:untrusted
...
$ docker push --disable-content-trust docker/trusttest:untrusted
...
```
## Related information ## Related information