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Adjust docs for password protected keystore #45054

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jkakavas
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This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.

This commit adds relevant parts in the elasticsearch-keystore
subcommands reference docs and in the reload secure settings API
doc.
@jkakavas jkakavas added >docs General docs changes :Core/Infra/Settings Settings infrastructure and APIs :Security/Security Security issues without another label v7.4.0 labels Jul 31, 2019
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Looks good, I left some suggestions.

decryption and reading across the cluster. The keystore's plain content is
The cluster nodes reload secure settings API is used to re-read the local node's encrypted keystore.
Specifically, it will prompt the keystore decryption and reading across the cluster.
The keystore's decrypted content is
used to reinitialize all compatible plugins. A compatible plugin can be
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I think this existing wording is deceptive. Plugin's can't be reinitialized. Rather, the consumers of the keystore settings are notified of the updated value.

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I went ahead and removed the existing additional information. It felt more like describing internal implementation than adding something of value for the users/API consumers.

==== Reload Password Protected Secure Settings

When the elasticsearch keystore is password protected and not simply obfuscated, the password for the keystore needs to be provided in the request to reload the secure settings.
Reloading the settings for the whole cluster assumes that all nodes keystores are protected with the same password and is only allowed when
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nit: nodes -> nodes' (plural possessive)

The cluster nodes reload secure settings API is used to re-read the
local node's encrypted keystore. Specifically, it will prompt the keystore
decryption and reading across the cluster. The keystore's plain content is
The cluster nodes reload secure settings API is used to re-read the local node's encrypted keystore.
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The local node's encrypted keystore implies to me the api must be run on every node, when in fact this is a cluster level API, correct? Maybe reword to ...is used to re-load the keystore on each node? I'm not sure encrypted should be there as a qualifier since in the no-passphrase case it is only obfuscated.

--------------------------------------------------
// NOTCONSOLE

<1> The password that the elasticsearch keystore is encrypted with.
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I woudl add a qualfiier that this password must be the same on all nodes.

--------------------------------------------------
// NOTCONSOLE

<1> The password that the elasticsearch keystore is encrypted with.
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encrypted with on the local node


<1> The password that the elasticsearch keystore is encrypted with.

Note:It is an error if secure settings are inconsistent across the cluster nodes, yet this consistency is not enforced whatsoever.Hence, reloading specific nodes is not standard.It is only justifiable when retrying failed reload operations.
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Should this be a real asciidoc "Note"? Also, seem to have lost some spacing between sentences in moving down here.

bin/elasticsearch-keystore create -p
----------------------------------------------------------------

You will be prompted to enter the keystore password and the file `elasticsearch.keystore` will be created alongside `elasticsearch.yml` ,protected with the password you specified.
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nit: spacing after comma, remove space before comma

Note: It is an error if secure settings are inconsistent across the cluster
nodes, yet this consistency is not enforced whatsoever. Hence, reloading specific
nodes is not standard. It is only justifiable when retrying failed reload operations.
NOTE: It is an error if secure settings are inconsistent across the cluster nodes, yet this consistency is not enforced
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Suggested change
NOTE: It is an error if secure settings are inconsistent across the cluster nodes, yet this consistency is not enforced
NOTE: {es} returns an error if secure settings are inconsistent across the cluster nodes, but this consistency is not enforced

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We don't return an error ( this is what the "but this consistency is not enforced" is meant to explain ). I see how this is not very clear, I'm open to suggestions to rephrase this

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Thanks for the clarification. Here's a suggested rephrasing.

Suggested change
NOTE: It is an error if secure settings are inconsistent across the cluster nodes, yet this consistency is not enforced
NOTE: {es} requires consistent secure settings across the cluster nodes, but this consistency is not enforced.

Let me know if this is accurate. Also note that this removes the "whatsover." on the next line.

nodes, yet this consistency is not enforced whatsoever. Hence, reloading specific
nodes is not standard. It is only justifiable when retrying failed reload operations.
NOTE: It is an error if secure settings are inconsistent across the cluster nodes, yet this consistency is not enforced
whatsoever. Hence, reloading specific nodes is not standard.It is only justifiable when retrying failed reload operations.
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Suggested change
whatsoever. Hence, reloading specific nodes is not standard.It is only justifiable when retrying failed reload operations.
Hence, reloading specific nodes is not standard. It is only justifiable when retrying failed reload operations.

=== Changing the password of the keystore

To change the password of the `elasticsearch.keystore`, use the `passwd` command.
If the elasticsearch keystore is password protected, you will be prompted to enter the current password and then enter the new one
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Suggested change
If the elasticsearch keystore is password protected, you will be prompted to enter the current password and then enter the new one
If the {es} keystore is password protected, you will be prompted to enter the current password and then enter a new one.

----------------------------------------------------------------

The file `elasticsearch.keystore` will be created alongside `elasticsearch.yml`.
You can use the `passwd` subcommand to set a password to a previously obfuscated only keystore, but also to remove the password from an encrypted keystore by setting it to an empty string.
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Suggested change
You can use the `passwd` subcommand to set a password to a previously obfuscated only keystore, but also to remove the password from an encrypted keystore by setting it to an empty string.
You can use the `passwd` subcommand to set a password to a previously obfuscated-only keystore and the password from an encrypted keystore by setting it to an empty string.


==== Reload Password Protected Secure Settings

When the elasticsearch keystore is password protected and not simply obfuscated, the password for the keystore needs
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Suggested change
When the elasticsearch keystore is password protected and not simply obfuscated, the password for the keystore needs
When the {es} keystore is password protected and not simply obfuscated, the password for the keystore needs

--------------------------------------------------
// NOTCONSOLE

<1> The common password that the elasticsearch keystore is encrypted with in every node of the cluster.
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Suggested change
<1> The common password that the elasticsearch keystore is encrypted with in every node of the cluster.
<1> The common password that the {es} keystore is encrypted with in every node of the cluster.

<1> The common password that the elasticsearch keystore is encrypted with in every node of the cluster.

Alternatively the secure settings can be reloaded on a per node basis, locally accessing the API and passing the
node-specific elasticsearch keystore password.
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Suggested change
node-specific elasticsearch keystore password.
node-specific {es} keystore password.

--------------------------------------------------
// NOTCONSOLE

<1> The password that the elasticsearch keystore is encrypted with on the local node.
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Suggested change
<1> The password that the elasticsearch keystore is encrypted with on the local node.
<1> The password that the {es} keystore is encrypted with on the local node.


You will be prompted to enter the keystore password and the file `elasticsearch.keystore` will be created alongside `elasticsearch.yml`, protected with the password you specified.

NOTE: If you don't specify the `-p` flag or if you enter an empty password, the elasticsearch keystore will be obfuscated but not password protected.
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Suggested change
NOTE: If you don't specify the `-p` flag or if you enter an empty password, the elasticsearch keystore will be obfuscated but not password protected.
NOTE: If you don't specify the `-p` flag or if you enter an empty password, the {es} keystore will be obfuscated but not password protected.


[float]
[[list-settings]]
=== Listing settings in the keystore

A list of the settings in the keystore is available with the `list` command:
A list of the settings in the keystore is available with the `list` command.
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
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Suggested change
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
If the {es} keystore is password protected, you will be prompted to enter the password:

Sensitive string settings, like authentication credentials for cloud
plugins, can be added using the `add` command:
Sensitive string settings, like authentication credentials for cloud plugins, can be added using the `add` command.
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
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Suggested change
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
If the {es} keystore is password protected, you will be prompted to enter the password:

[float]
[[add-file-to-keystore]]
=== Adding file settings
You can add sensitive files, like authentication key files for cloud plugins,
using the `add-file` command. Be sure to include your file path as an argument
after the setting name.
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
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Suggested change
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
If the {es} keystore is password protected, you will be prompted to enter a password:

@@ -84,7 +107,8 @@ bin/elasticsearch-keystore add-file the.setting.name.to.set /path/example-file.j
[[remove-settings]]
=== Removing settings

To remove a setting from the keystore, use the `remove` command:
To remove a setting from the keystore, use the `remove` command.
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
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Suggested change
If the elasticsearch keystore is password protected, you will be prompted to enter the password:
If the {es} keystore is password protected, you will be prompted to enter a password:

the reload has been completed, meaning that all internal datastructures dependent
// NOTCONSOLE

<1> The password that the elasticsearch keystore is encrypted with.
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Suggested change
<1> The password that the elasticsearch keystore is encrypted with.
<1> The password that the {es} keystore is encrypted with.

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LGTM. Left a few minor nits and rewordings, but nothing blocking. Thanks @jkakavas.

@jkakavas jkakavas merged commit 0f34e9f into elastic:feature-pwd-protected-keystore Aug 1, 2019
williamrandolph pushed a commit to williamrandolph/elasticsearch that referenced this pull request Nov 18, 2019
This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.
williamrandolph added a commit that referenced this pull request Dec 11, 2019
* Reload secure settings with password (#43197)

If a password is not set, we assume an empty string to be
compatible with previous behavior.
Only allow the reload to be broadcast to other nodes if TLS is
enabled for the transport layer.

* Add passphrase support to elasticsearch-keystore (#38498)

This change adds support for keystore passphrases to all subcommands
of the elasticsearch-keystore cli tool and adds a subcommand for
changing the passphrase of an existing keystore.
The work to read the passphrase in Elasticsearch when
loading, which will be addressed in a different PR.

Subcommands of elasticsearch-keystore can handle (open and create)
passphrase protected keystores

When reading a keystore, a user is only prompted for a passphrase
only if the keystore is passphrase protected.

When creating a keystore, a user is allowed (default behavior) to create one with an
empty passphrase

Passphrase can be set to be empty when changing/setting it for an
existing keystore

Relates to: #32691
Supersedes: #37472

* Restore behavior for force parameter (#44847)

Turns out that the behavior of `-f` for the add and add-file sub
commands where it would also forcibly create the keystore if it
didn't exist, was by design - although undocumented.
This change restores that behavior auto-creating a keystore that
is not password protected if the force flag is used. The force
OptionSpec is moved to the BaseKeyStoreCommand as we will presumably
want to maintain the same behavior in any other command that takes
a force option.

*  Handle pwd protected keystores in all CLI tools  (#45289)

This change ensures that `elasticsearch-setup-passwords` and
`elasticsearch-saml-metadata` can handle a password protected
elasticsearch.keystore.
For setup passwords the user would be prompted to add the
elasticsearch keystore password upon running the tool. There is no
option to pass the password as a parameter as we assume the user is
present in order to enter the desired passwords for the built-in
users.
For saml-metadata, we prompt for the keystore password at all times
even though we'd only need to read something from the keystore when
there is a signing or encryption configuration.

* Modify docs for setup passwords and saml metadata cli (#45797)

Adds a sentence in the documentation of `elasticsearch-setup-passwords`
and `elasticsearch-saml-metadata` to describe that users would be
prompted for the keystore's password when running these CLI tools,
when the keystore is password protected.

Co-Authored-By: Lisa Cawley <lcawley@elastic.co>

* Elasticsearch keystore passphrase for startup scripts (#44775)

This commit allows a user to provide a keystore password on Elasticsearch
startup, but only prompts when the keystore exists and is encrypted.

The entrypoint in Java code is standard input. When the Bootstrap class is
checking for secure keystore settings, it checks whether or not the keystore
is encrypted. If so, we read one line from standard input and use this as the
password. For simplicity's sake, we allow a maximum passphrase length of 128
characters. (This is an arbitrary limit and could be increased or eliminated.
It is also enforced in the keystore tools, so that a user can't create a
password that's too long to enter at startup.)

In order to provide a password on standard input, we have to account for four
different ways of starting Elasticsearch: the bash startup script, the Windows
batch startup script, systemd startup, and docker startup. We use wrapper
scripts to reduce systemd and docker to the bash case: in both cases, a
wrapper script can read a passphrase from the filesystem and pass it to the
bash script.

In order to simplify testing the need for a passphrase, I have added a
has-passwd command to the keystore tool. This command can run silently, and
exit with status 0 when the keystore has a password. It exits with status 1 if
the keystore doesn't exist or exists and is unencrypted.

A good deal of the code-change in this commit has to do with refactoring
packaging tests to cleanly use the same tests for both the "archive" and the
"package" cases. This required not only moving tests around, but also adding
some convenience methods for an abstraction layer over distribution-specific
commands.

I will write some user-facing documentation for these changes in a follow-up
commit.

* Adjust docs for password protected keystore (#45054)

This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.

* Cleanup after feature branch reconstruction

The feature branch for the password-protected keystore, due to an
accident, contains a large number of unrelated commits. In order to get
a cleaner merge, I've cherry-picked the main commits that went into the
feature branch against a branch derived from master — essentially, a
rebase onto master. We've ignored some tests that will addressed in
follow-up PRs to the feature branch.
williamrandolph added a commit to williamrandolph/elasticsearch that referenced this pull request Jan 16, 2020
)

* Reload secure settings with password (elastic#43197)

If a password is not set, we assume an empty string to be
compatible with previous behavior.
Only allow the reload to be broadcast to other nodes if TLS is
enabled for the transport layer.

* Add passphrase support to elasticsearch-keystore (elastic#38498)

This change adds support for keystore passphrases to all subcommands
of the elasticsearch-keystore cli tool and adds a subcommand for
changing the passphrase of an existing keystore.
The work to read the passphrase in Elasticsearch when
loading, which will be addressed in a different PR.

Subcommands of elasticsearch-keystore can handle (open and create)
passphrase protected keystores

When reading a keystore, a user is only prompted for a passphrase
only if the keystore is passphrase protected.

When creating a keystore, a user is allowed (default behavior) to create one with an
empty passphrase

Passphrase can be set to be empty when changing/setting it for an
existing keystore

Relates to: elastic#32691
Supersedes: elastic#37472

* Restore behavior for force parameter (elastic#44847)

Turns out that the behavior of `-f` for the add and add-file sub
commands where it would also forcibly create the keystore if it
didn't exist, was by design - although undocumented.
This change restores that behavior auto-creating a keystore that
is not password protected if the force flag is used. The force
OptionSpec is moved to the BaseKeyStoreCommand as we will presumably
want to maintain the same behavior in any other command that takes
a force option.

*  Handle pwd protected keystores in all CLI tools  (elastic#45289)

This change ensures that `elasticsearch-setup-passwords` and
`elasticsearch-saml-metadata` can handle a password protected
elasticsearch.keystore.
For setup passwords the user would be prompted to add the
elasticsearch keystore password upon running the tool. There is no
option to pass the password as a parameter as we assume the user is
present in order to enter the desired passwords for the built-in
users.
For saml-metadata, we prompt for the keystore password at all times
even though we'd only need to read something from the keystore when
there is a signing or encryption configuration.

* Modify docs for setup passwords and saml metadata cli (elastic#45797)

Adds a sentence in the documentation of `elasticsearch-setup-passwords`
and `elasticsearch-saml-metadata` to describe that users would be
prompted for the keystore's password when running these CLI tools,
when the keystore is password protected.

Co-Authored-By: Lisa Cawley <lcawley@elastic.co>

* Elasticsearch keystore passphrase for startup scripts (elastic#44775)

This commit allows a user to provide a keystore password on Elasticsearch
startup, but only prompts when the keystore exists and is encrypted.

The entrypoint in Java code is standard input. When the Bootstrap class is
checking for secure keystore settings, it checks whether or not the keystore
is encrypted. If so, we read one line from standard input and use this as the
password. For simplicity's sake, we allow a maximum passphrase length of 128
characters. (This is an arbitrary limit and could be increased or eliminated.
It is also enforced in the keystore tools, so that a user can't create a
password that's too long to enter at startup.)

In order to provide a password on standard input, we have to account for four
different ways of starting Elasticsearch: the bash startup script, the Windows
batch startup script, systemd startup, and docker startup. We use wrapper
scripts to reduce systemd and docker to the bash case: in both cases, a
wrapper script can read a passphrase from the filesystem and pass it to the
bash script.

In order to simplify testing the need for a passphrase, I have added a
has-passwd command to the keystore tool. This command can run silently, and
exit with status 0 when the keystore has a password. It exits with status 1 if
the keystore doesn't exist or exists and is unencrypted.

A good deal of the code-change in this commit has to do with refactoring
packaging tests to cleanly use the same tests for both the "archive" and the
"package" cases. This required not only moving tests around, but also adding
some convenience methods for an abstraction layer over distribution-specific
commands.

I will write some user-facing documentation for these changes in a follow-up
commit.

* Adjust docs for password protected keystore (elastic#45054)

This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.

* Cleanup after feature branch reconstruction

The feature branch for the password-protected keystore, due to an
accident, contains a large number of unrelated commits. In order to get
a cleaner merge, I've cherry-picked the main commits that went into the
feature branch against a branch derived from master — essentially, a
rebase onto master. We've ignored some tests that will addressed in
follow-up PRs to the feature branch.
williamrandolph added a commit that referenced this pull request Jan 28, 2020
* Reload secure settings with password (#43197)

If a password is not set, we assume an empty string to be
compatible with previous behavior.
Only allow the reload to be broadcast to other nodes if TLS is
enabled for the transport layer.

* Add passphrase support to elasticsearch-keystore (#38498)

This change adds support for keystore passphrases to all subcommands
of the elasticsearch-keystore cli tool and adds a subcommand for
changing the passphrase of an existing keystore.
The work to read the passphrase in Elasticsearch when
loading, which will be addressed in a different PR.

Subcommands of elasticsearch-keystore can handle (open and create)
passphrase protected keystores

When reading a keystore, a user is only prompted for a passphrase
only if the keystore is passphrase protected.

When creating a keystore, a user is allowed (default behavior) to create one with an
empty passphrase

Passphrase can be set to be empty when changing/setting it for an
existing keystore

Relates to: #32691
Supersedes: #37472

* Restore behavior for force parameter (#44847)

Turns out that the behavior of `-f` for the add and add-file sub
commands where it would also forcibly create the keystore if it
didn't exist, was by design - although undocumented.
This change restores that behavior auto-creating a keystore that
is not password protected if the force flag is used. The force
OptionSpec is moved to the BaseKeyStoreCommand as we will presumably
want to maintain the same behavior in any other command that takes
a force option.

*  Handle pwd protected keystores in all CLI tools  (#45289)

This change ensures that `elasticsearch-setup-passwords` and
`elasticsearch-saml-metadata` can handle a password protected
elasticsearch.keystore.
For setup passwords the user would be prompted to add the
elasticsearch keystore password upon running the tool. There is no
option to pass the password as a parameter as we assume the user is
present in order to enter the desired passwords for the built-in
users.
For saml-metadata, we prompt for the keystore password at all times
even though we'd only need to read something from the keystore when
there is a signing or encryption configuration.

* Modify docs for setup passwords and saml metadata cli (#45797)

Adds a sentence in the documentation of `elasticsearch-setup-passwords`
and `elasticsearch-saml-metadata` to describe that users would be
prompted for the keystore's password when running these CLI tools,
when the keystore is password protected.

Co-Authored-By: Lisa Cawley <lcawley@elastic.co>

* Elasticsearch keystore passphrase for startup scripts (#44775)

This commit allows a user to provide a keystore password on Elasticsearch
startup, but only prompts when the keystore exists and is encrypted.

The entrypoint in Java code is standard input. When the Bootstrap class is
checking for secure keystore settings, it checks whether or not the keystore
is encrypted. If so, we read one line from standard input and use this as the
password. For simplicity's sake, we allow a maximum passphrase length of 128
characters. (This is an arbitrary limit and could be increased or eliminated.
It is also enforced in the keystore tools, so that a user can't create a
password that's too long to enter at startup.)

In order to provide a password on standard input, we have to account for four
different ways of starting Elasticsearch: the bash startup script, the Windows
batch startup script, systemd startup, and docker startup. We use wrapper
scripts to reduce systemd and docker to the bash case: in both cases, a
wrapper script can read a passphrase from the filesystem and pass it to the
bash script.

In order to simplify testing the need for a passphrase, I have added a
has-passwd command to the keystore tool. This command can run silently, and
exit with status 0 when the keystore has a password. It exits with status 1 if
the keystore doesn't exist or exists and is unencrypted.

A good deal of the code-change in this commit has to do with refactoring
packaging tests to cleanly use the same tests for both the "archive" and the
"package" cases. This required not only moving tests around, but also adding
some convenience methods for an abstraction layer over distribution-specific
commands.

* Adjust docs for password protected keystore (#45054)

This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.

* Fix failing Keystore Passphrase test for feature branch (#50154)

One problem with the passphrase-from-file tests, as written, is that
they would leave a SystemD environment variable set when they failed,
and this setting would cause elasticsearch startup to fail for other
tests as well. By using a try-finally, I hope that these tests will fail
more gracefully.

It appears that our Fedora and Ubuntu environments may be configured to
store journald information under /var rather than under /run, so that it
will persist between boots. Our destructive tests that read from the
journal need to account for this in order to avoid trying to limit the
output we check in tests.

* Run keystore management tests on docker distros (#50610)

* Add Docker handling to PackagingTestCase

Keystore tests need to be able to run in the Docker case. We can do this
by using a DockerShell instead of a plain Shell when Docker is running.

* Improve ES startup check for docker

Previously we were checking truncated output for the packaged JDK as
an indication that Elasticsearch had started. With new preliminary
password checks, we might get a false positive from ES keystore
commands, so we have to check specifically that the Elasticsearch
class from the Bootstrap package is what's running.

* Test password-protected keystore with Docker (#50803)

This commit adds two tests for the case where we mount a
password-protected keystore into a Docker container and provide a
password via a Docker environment variable.

We also fix a logging bug where we were logging the identifier for an
array of strings rather than the contents of that array.

* Add documentation for keystore startup prompting (#50821)

When a keystore is password-protected, Elasticsearch will prompt at
startup. This commit adds documentation for this prompt for the archive,
systemd, and Docker cases.

Co-authored-by: Lisa Cawley <lcawley@elastic.co>

* Warn when unable to upgrade keystore on debian (#51011)

For Red Hat RPM upgrades, we warn if we can't upgrade the keystore. This
commit brings the same logic to the code for Debian packages. See the
posttrans file for gets executed for RPMs.

* Restore handling of string input

Adds tests that were mistakenly removed. One of these tests proved
we were not handling the the stdin (-x) option correctly when no
input was added. This commit restores the original approach of
reading stdin one char at a time until there is no more (-1, \r, \n)
instead of using readline() that might return null

* Apply spotless reformatting

* Use '--since' flag to get recent journal messages

When we get Elasticsearch logs from journald, we want to fetch only log
messages from the last run. There are two reasons for this. First, if
there are many logs, we might get a string that's too large for our
utility methods. Second, when we're looking for a specific message or
error, we almost certainly want to look only at messages from the last
execution.

Previously, we've been trying to do this by clearing out the physical
files under the journald process. But there seems to be some contention
over these directories: if journald writes a log file in between when
our deletion command deletes the file and when it deletes the log
directory, the deletion will fail.

It seems to me that we might be able to use journald's "--since" flag to
retrieve only log messages from the last run, and that this might be
less likely to fail due to race conditions in file deletion.

Unfortunately, it looks as if the "--since" flag has a granularity of
one-second. I've added a two-second sleep to make sure that there's a
sufficient gap between the test that will read from journald and the
test before it.

* Use new journald wrapper pattern

* Update version added in secure settings request

Co-authored-by: Lisa Cawley <lcawley@elastic.co>
Co-authored-by: Ioannis Kakavas <ikakavas@protonmail.com>
williamrandolph added a commit that referenced this pull request Jan 28, 2020
* Reload secure settings with password (#43197)

If a password is not set, we assume an empty string to be
compatible with previous behavior.
Only allow the reload to be broadcast to other nodes if TLS is
enabled for the transport layer.

* Add passphrase support to elasticsearch-keystore (#38498)

This change adds support for keystore passphrases to all subcommands
of the elasticsearch-keystore cli tool and adds a subcommand for
changing the passphrase of an existing keystore.
The work to read the passphrase in Elasticsearch when
loading, which will be addressed in a different PR.

Subcommands of elasticsearch-keystore can handle (open and create)
passphrase protected keystores

When reading a keystore, a user is only prompted for a passphrase
only if the keystore is passphrase protected.

When creating a keystore, a user is allowed (default behavior) to create one with an
empty passphrase

Passphrase can be set to be empty when changing/setting it for an
existing keystore

Relates to: #32691
Supersedes: #37472

* Restore behavior for force parameter (#44847)

Turns out that the behavior of `-f` for the add and add-file sub
commands where it would also forcibly create the keystore if it
didn't exist, was by design - although undocumented.
This change restores that behavior auto-creating a keystore that
is not password protected if the force flag is used. The force
OptionSpec is moved to the BaseKeyStoreCommand as we will presumably
want to maintain the same behavior in any other command that takes
a force option.

*  Handle pwd protected keystores in all CLI tools  (#45289)

This change ensures that `elasticsearch-setup-passwords` and
`elasticsearch-saml-metadata` can handle a password protected
elasticsearch.keystore.
For setup passwords the user would be prompted to add the
elasticsearch keystore password upon running the tool. There is no
option to pass the password as a parameter as we assume the user is
present in order to enter the desired passwords for the built-in
users.
For saml-metadata, we prompt for the keystore password at all times
even though we'd only need to read something from the keystore when
there is a signing or encryption configuration.

* Modify docs for setup passwords and saml metadata cli (#45797)

Adds a sentence in the documentation of `elasticsearch-setup-passwords`
and `elasticsearch-saml-metadata` to describe that users would be
prompted for the keystore's password when running these CLI tools,
when the keystore is password protected.

Co-Authored-By: Lisa Cawley <lcawley@elastic.co>

* Elasticsearch keystore passphrase for startup scripts (#44775)

This commit allows a user to provide a keystore password on Elasticsearch
startup, but only prompts when the keystore exists and is encrypted.

The entrypoint in Java code is standard input. When the Bootstrap class is
checking for secure keystore settings, it checks whether or not the keystore
is encrypted. If so, we read one line from standard input and use this as the
password. For simplicity's sake, we allow a maximum passphrase length of 128
characters. (This is an arbitrary limit and could be increased or eliminated.
It is also enforced in the keystore tools, so that a user can't create a
password that's too long to enter at startup.)

In order to provide a password on standard input, we have to account for four
different ways of starting Elasticsearch: the bash startup script, the Windows
batch startup script, systemd startup, and docker startup. We use wrapper
scripts to reduce systemd and docker to the bash case: in both cases, a
wrapper script can read a passphrase from the filesystem and pass it to the
bash script.

In order to simplify testing the need for a passphrase, I have added a
has-passwd command to the keystore tool. This command can run silently, and
exit with status 0 when the keystore has a password. It exits with status 1 if
the keystore doesn't exist or exists and is unencrypted.

A good deal of the code-change in this commit has to do with refactoring
packaging tests to cleanly use the same tests for both the "archive" and the
"package" cases. This required not only moving tests around, but also adding
some convenience methods for an abstraction layer over distribution-specific
commands.

* Adjust docs for password protected keystore (#45054)

This commit adds relevant parts in the elasticsearch-keystore
sub-commands reference docs and in the reload secure settings API
doc.

* Fix failing Keystore Passphrase test for feature branch (#50154)

One problem with the passphrase-from-file tests, as written, is that
they would leave a SystemD environment variable set when they failed,
and this setting would cause elasticsearch startup to fail for other
tests as well. By using a try-finally, I hope that these tests will fail
more gracefully.

It appears that our Fedora and Ubuntu environments may be configured to
store journald information under /var rather than under /run, so that it
will persist between boots. Our destructive tests that read from the
journal need to account for this in order to avoid trying to limit the
output we check in tests.

* Run keystore management tests on docker distros (#50610)

* Add Docker handling to PackagingTestCase

Keystore tests need to be able to run in the Docker case. We can do this
by using a DockerShell instead of a plain Shell when Docker is running.

* Improve ES startup check for docker

Previously we were checking truncated output for the packaged JDK as
an indication that Elasticsearch had started. With new preliminary
password checks, we might get a false positive from ES keystore
commands, so we have to check specifically that the Elasticsearch
class from the Bootstrap package is what's running.

* Test password-protected keystore with Docker (#50803)

This commit adds two tests for the case where we mount a
password-protected keystore into a Docker container and provide a
password via a Docker environment variable.

We also fix a logging bug where we were logging the identifier for an
array of strings rather than the contents of that array.

* Add documentation for keystore startup prompting (#50821)

When a keystore is password-protected, Elasticsearch will prompt at
startup. This commit adds documentation for this prompt for the archive,
systemd, and Docker cases.

Co-authored-by: Lisa Cawley <lcawley@elastic.co>

* Warn when unable to upgrade keystore on debian (#51011)

For Red Hat RPM upgrades, we warn if we can't upgrade the keystore. This
commit brings the same logic to the code for Debian packages. See the
posttrans file for gets executed for RPMs.

* Restore handling of string input

Adds tests that were mistakenly removed. One of these tests proved
we were not handling the the stdin (-x) option correctly when no
input was added. This commit restores the original approach of
reading stdin one char at a time until there is no more (-1, \r, \n)
instead of using readline() that might return null

* Apply spotless reformatting

* Use '--since' flag to get recent journal messages

When we get Elasticsearch logs from journald, we want to fetch only log
messages from the last run. There are two reasons for this. First, if
there are many logs, we might get a string that's too large for our
utility methods. Second, when we're looking for a specific message or
error, we almost certainly want to look only at messages from the last
execution.

Previously, we've been trying to do this by clearing out the physical
files under the journald process. But there seems to be some contention
over these directories: if journald writes a log file in between when
our deletion command deletes the file and when it deletes the log
directory, the deletion will fail.

It seems to me that we might be able to use journald's "--since" flag to
retrieve only log messages from the last run, and that this might be
less likely to fail due to race conditions in file deletion.

Unfortunately, it looks as if the "--since" flag has a granularity of
one-second. I've added a two-second sleep to make sure that there's a
sufficient gap between the test that will read from journald and the
test before it.

* Use new journald wrapper pattern

* Update version added in secure settings request

Co-authored-by: Lisa Cawley <lcawley@elastic.co>
Co-authored-by: Ioannis Kakavas <ikakavas@protonmail.com>
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