Commit Graph

591 Commits

Author SHA1 Message Date
Ioannis Kakavas 4f722f0f53
Fix Active Directory tests (#47358) (#47440)
Fixes multiple Active Directory related tests that run against the
samba fixture. Some were failing since we changed the realm settings
format in 7.0 and a few were slightly broken in other ways.
We can move to cleanup the tests in a follow up but this work fits
better to be done with or after we move the tests from a Samba
based fixture to a real(-ish) Microsoft Active Directory based
fixture.

Resolves: #33425, #35738
2019-10-02 17:18:12 +03:00
Albert Zaharovits 78558a7b2f
Fix AD realm additional metadata (#47179)
Due to a regression bug the metadata Active Directory realm
setting is ignored (it works correctly for the LDAP realm type).
This commit redresses it.

Closes #45848
2019-10-01 17:05:25 +03:00
Ioannis Kakavas 3b06916fcd Revert "Fix Active Directory tests (#47266)"
This reverts commit 7d9c064218.
2019-10-01 13:32:31 +03:00
Ioannis Kakavas 7d9c064218 Fix Active Directory tests (#47266)
Fixes multiple Active Directory related tests that run against the
samba fixture. Some were failing since we changed the realm settings
format in 7.0 and a few were slightly broken in other ways.
We can move to cleanup the tests in a follow up but this work fits
better to be done with or after we move the tests from a Samba
based fixture to a real(-ish) Microsoft Active Directory based
fixture.

Resolves: #33425, #35738
2019-10-01 10:52:07 +03:00
Ioannis Kakavas 33c5e5b09d Fix SSLErrorMessageTests in Windows (#47315)
- Build paths with PathUtils#get instead of hard-coding a string with
forward slashes.
- Do not try to match the whole message that includes paths. The
file separator is `\\` in windows but when we throw an Elasticsearch
Exception, the message is formatted with LoggerMessageFormat#format
which replaces `\\` with `\` in Path names. That means that in Windows
the Exception message will contain paths with single backslashes while
the expected string that comes from Path#toString on filename and
env.configFile will contain double backslashes. There is no point in
attempting to match the whole message string for the purpose of this test.

Resolves: #45598
2019-10-01 09:14:36 +03:00
Yogesh Gaikwad 2be351c5d0
Use 'should' clause instead of 'filter' when querying native privileges (#47019) (#47271)
When we added support for wildcard application names, we started to build
the prefix query along with the term query but we used 'filter' clause
instead of 'should', so this would not fetch the correct application
privilege descriptor thereby failing the _has_privilege checks.
This commit changes the clause to use should and with minimum_should_match
as 1.
2019-09-30 14:14:52 +10:00
Rory Hunter 53a4d2176f
Convert most awaitBusy calls to assertBusy (#45794) (#47112)
Backport of #45794 to 7.x. Convert most `awaitBusy` calls to
`assertBusy`, and use asserts where possible. Follows on from #28548 by
@liketic.

There were a small number of places where it didn't make sense to me to
call `assertBusy`, so I kept the existing calls but renamed the method to
`waitUntil`. This was partly to better reflect its usage, and partly so
that anyone trying to add a new call to awaitBusy wouldn't be able to find
it.

I also didn't change the usage in `TransportStopRollupAction` as the
comments state that the local awaitBusy method is a temporary
copy-and-paste.

Other changes:

  * Rework `waitForDocs` to scale its timeout. Instead of calling
    `assertBusy` in a loop, work out a reasonable overall timeout and await
    just once.
  * Some tests failed after switching to `assertBusy` and had to be fixed.
  * Correct the expect templates in AbstractUpgradeTestCase.  The ES
    Security team confirmed that they don't use templates any more, so
    remove this from the expected templates. Also rewrite how the setup
    code checks for templates, in order to give more information.
  * Remove an expected ML template from XPackRestTestConstants The ML team
    advised that the ML tests shouldn't be waiting for any
    `.ml-notifications*` templates, since such checks should happen in the
    production code instead.
  * Also rework the template checking code in `XPackRestTestHelper` to give
    more helpful failure messages.
  * Fix issue in `DataFrameSurvivesUpgradeIT` when upgrading from < 7.4
2019-09-29 12:21:46 +01:00
Tanguy Leroux 95e2ca741e
Remove unused private methods and fields (#47154)
This commit removes a bunch of unused private fields and unused
private methods from the code base.

Backport of (#47115)
2019-09-26 12:49:21 +02:00
Yogesh Gaikwad 9a64b7a888
[Backport] Validate `query` field when creating roles (#46275) (#47094)
In the current implementation, the validation of the role query
occurs at runtime when the query is being executed.

This commit adds validation for the role query when creating a role
but not for the template query as we do not have the runtime
information required for evaluating the template query (eg. authenticated user's
information). This is similar to the scripts that we
store but do not evaluate or parse if they are valid queries or not.

For validation, the query is evaluated (if not a template), parsed to build the
QueryBuilder and verify if the query type is allowed.

Closes #34252
2019-09-26 17:57:36 +10:00
Jim Ferenczi 04972baffa
Merge ShardSearchTransportRequest and ShardSearchLocalRequest (#46996) (#47081)
This change merges the `ShardSearchTransportRequest` and `ShardSearchLocalRequest`
into a single `ShardSearchRequest` that can be used to create a SearchContext.

Relates #46523
2019-09-26 09:20:53 +02:00
Ioannis Kakavas 23bceaadf8
Handle RelayState in preparing a SAMLAuthN Request (#46534) (#47092)
This change allows for the caller of the `saml/prepare` API to pass
a `relay_state` parameter that will then be part of the redirect
URL in the response as the `RelayState` query parameter.

The SAML IdP is required to reflect back the value of that relay
state when sending a SAML Response. The caller of the APIs can
then, when receiving the SAML Response, read and consume the value
as it see fit.
2019-09-25 13:23:46 +03:00
Albert Zaharovits 3a82e0f7f4
Do not rewrite aliases on remove-index from aliases requests (#46989) (#47018)
When we rewrite alias requests, after filtering down to only those that
the user is authorized to see, it can be that there are no aliases
remaining in the request. However, core Elasticsearch interprets this as
_all so the user would see more than they are authorized for. To address
this, we previously rewrote all such requests to have aliases `"*"`,
`"-*"`, which would be interpreted when aliases are resolved as
nome. Yet, this is only needed for get aliases requests and we were
applying it to all alias requests, including remove index requests. If
such a request was sent to a coordinating node that is not the master
node, the request would be rewritten to include `"*"` and `"-*"`, and
then the master would authorize the user for these. If the user had
limited permissions, the request would fail, even if they were
authorized on the index that the remove index action was over. This
commit addresses this by rewriting for get aliases and remove
aliases request types but not for the remove index.

Co-authored-by: Albert Zaharovits <albert.zaharovits@elastic.co>
Co-authored-by: Tim Vernum <tim@adjective.org>
2019-09-24 19:07:55 +03:00
Ioannis Kakavas 98e6bb4d01
Workaround JDK-8213202 in SSLClientAuthTests (#46995)
This change works around JDK-8213202, which is a bug related to TLSv1.3
session resumption before JDK 11.0.3 that occurs when there are
multiple concurrent sessions being established. Nodes connecting to
each other will trigger this bug when client authentication is
disabled, which is the case for SSLClientAuthTests.

Backport of #46680
2019-09-24 12:47:56 +03:00
Hendrik Muhs abe889af75
[7.5][Transform] rename classes in transform plugin (#46867)
rename classes and settings in transform plugin, provide BWC for old settings
2019-09-20 10:43:00 +02:00
Yannick Welsch 9638ca20b0 Allow dropping documents with auto-generated ID (#46773)
When using auto-generated IDs + the ingest drop processor (which looks to be used by filebeat
as well) + coordinating nodes that do not have the ingest processor functionality, this can lead
to a NullPointerException.

The issue is that markCurrentItemAsDropped() is creating an UpdateResponse with no id when
the request contains auto-generated IDs. The response serialization is lenient for our
REST/XContent format (i.e. we will send "id" : null) but the internal transport format (used for
communication between nodes) assumes for this field to be non-null, which means that it can't
be serialized between nodes. Bulk requests with ingest functionality are processed on the
coordinating node if the node has the ingest capability, and only otherwise sent to a different
node. This means that, in order to reproduce this, one needs two nodes, with the coordinating
node not having the ingest functionality.

Closes #46678
2019-09-19 16:46:33 +02:00
Armin Braun 6b09c2cdbb
Limit Netty Workers in NativeRealmIntegTestCase (#46816) (#46850)
The fact that this test randomly uses a relatively large number
of nodes and hence Netty worker threads created a problem with
running out of direct memory on CI.
Tests run with 512M heap (and hence 512M direct memory) by default.
On a CI worker with 16 cores, this means Netty will by default set
up 32 transport workers. If we get unlucky and a lot of them
actually do work (and thus instantiate a `CopyBytesSocketChannel`
which costs 1M per thread for the thread-local IO buffer) we
would run out of memory.

This specific failure was only seen with `NativeRealmIntegTests` so I
only added the constraint on the Netty worker count here.
We can add it to other tests (or `SecurityIntegTestCase`) if need be
but for now it doesn't seem necessary so I opted for least impact.

Closes #46803
2019-09-19 13:07:42 +02:00
Luca Cavanna e57756492a Update http-core and http-client dependencies (#46549)
Relates to #45808
Closes #45577
2019-09-12 09:45:29 +02:00
James Rodewig f9bf10f2b6
[DOCS] Change "a SSL" to "an SSL" in the Java docs (#46524) (#46618) 2019-09-11 15:55:57 -04:00
Ioannis Kakavas 35810bd2ae
Enforce realm name uniqueness (#46580)
We depend on file realms being unique in a number of places. Pre
7.0 this was enforced by the fact that the multiple realm types
with different name would mean identical configuration keys and
cause configuration parsing errors. Since we intoduced affix
settings for realms this is not the case any more as the realm type
is part of the configuration key.
This change adds a check when building realms which will explicitly
fail if multiple realms are defined with the same name.

Backport of #46253
2019-09-11 13:13:59 +03:00
Tim Vernum 80064652f8
Fallback to realm authc if ApiKey fails (#46552)
This changes API-Key authentication to always fallback to the realm
chain if the API key is not valid. The previous behaviour was
inconsistent and would terminate on some failures, but continue to the
realm chain for others.

Backport of: #46538
2019-09-11 14:33:17 +10:00
Alpar Torok b40ac6dee7 mute on 7.x fo windows
Tracking #44942
2019-09-10 12:34:16 +03:00
Yogesh Gaikwad d5acb15a71
[Backport] Initialize document subset bit set cache used for DLS (#46211) (#46359)
This commit initializes DocumentSubsetBitsetCache even if DLS
is disabled. Previously it would throw null pointer when querying
usage stats if we explicitly disabled DLS as there would be no instance of DocumentSubsetBitsetCache to query. It is okay to initialize
DocumentSubsetBitsetCache which will be empty as the license enforcement
would prevent usage of DLS feature and it will not fail when accessing usage stats.

Closes #45147
2019-09-05 14:34:19 +10:00
Andrey Ershov ece9eb4acd Remove stack trace logging in Security(Transport|Http)ExceptionHandler (#45966)
As per #45852 comment we no longer need to log stack-traces in
SecurityTransportExceptionHandler and SecurityHttpExceptionHandler even
if trace logging is enabled.

(cherry picked from commit c99224a32d26db985053b7b36e2049036e438f97)
2019-09-04 11:50:35 +03:00
Yogesh Gaikwad 7b6246ec67
Add `manage_own_api_key` cluster privilege (#45897) (#46023)
The existing privilege model for API keys with privileges like
`manage_api_key`, `manage_security` etc. are too permissive and
we would want finer-grained control over the cluster privileges
for API keys. Previously APIs created would also need these
privileges to get its own information.

This commit adds support for `manage_own_api_key` cluster privilege
which only allows api key cluster actions on API keys owned by the
currently authenticated user. Also adds support for retrieval of
the API key self-information when authenticating via API key
without the need for the additional API key privileges.
To support this privilege, we are introducing additional
authentication context along with the request context such that
it can be used to authorize cluster actions based on the current
user authentication.

The API key get and invalidate APIs introduce an `owner` flag
that can be set to true if the API key request (Get or Invalidate)
is for the API keys owned by the currently authenticated user only.
In that case, `realm` and `username` cannot be set as they are
assumed to be the currently authenticated ones.

The changes cover HLRC changes, documentation for the API changes.

Closes #40031
2019-08-28 00:44:23 +10:00
Albert Zaharovits 1ebee5bf9b
PKI realm authentication delegation (#45906)
This commit introduces PKI realm delegation. This feature
supports the PKI authentication feature in Kibana.

In essence, this creates a new API endpoint which Kibana must
call to authenticate clients that use certificates in their TLS
connection to Kibana. The API call passes to Elasticsearch the client's
certificate chain. The response contains an access token to be further
used to authenticate as the client. The client's certificates are validated
by the PKI realms that have been explicitly configured to permit
certificates from the proxy (Kibana). The user calling the delegation
API must have the delegate_pki privilege.

Closes #34396
2019-08-27 14:42:46 +03:00
Ioannis Kakavas 2bee27dd54
Allow Transport Actions to indicate authN realm (#45946)
This commit allows the Transport Actions for the SSO realms to
indicate the realm that should be used to authenticate the
constructed AuthenticationToken. This is useful in the case that
many authentication realms of the same type have been configured
and where the caller of the API(Kibana or a custom web app) already
know which realm should be used so there is no need to iterate all
the realms of the same type.
The realm parameter is added in the relevant REST APIs as optional
so as not to introduce any breaking change.
2019-08-25 19:36:41 +03:00
William Brafford 2b549e7342
CLI tools: write errors to stderr instead of stdout (#45586)
Most of our CLI tools use the Terminal class, which previously did not provide methods for writing to standard output. When all output goes to standard out, there are two basic problems. First, errors and warnings are "swallowed" in pipelines, making it hard for a user to know when something's gone wrong. Second, errors and warnings are intermingled with legitimate output, making it difficult to pass the results of interactive scripts to other tools.

This commit adds a second set of print commands to Terminal for printing to standard error, with errorPrint corresponding to print and errorPrintln corresponding to println. This leaves it to developers to decide which output should go where. It also adjusts existing commands to send errors and warnings to stderr.

Usage is printed to standard output when it's correctly requested (e.g., bin/elasticsearch-keystore --help) but goes to standard error when a command is invoked incorrectly (e.g. bin/elasticsearch-keystore list-with-a-typo | sort).
2019-08-21 14:46:07 -04:00
David Roberts d40f3718f2 [ML] Muting 5 SSLErrorMessageTests tests on Windows (#45602)
Due to https://github.com/elastic/elasticsearch/issues/45598
2019-08-15 11:05:00 +01:00
Yogesh Gaikwad 471d940c44
Refactor cluster privileges and cluster permission (#45265) (#45442)
The current implementations make it difficult for
adding new privileges (example: a cluster privilege which is
more than cluster action-based and not exposed to the security
administrator). On the high level, we would like our cluster privilege
either:
- a named cluster privilege
  This corresponds to `cluster` field from the role descriptor
- or a configurable cluster privilege
  This corresponds to the `global` field from the role-descriptor and
allows a security administrator to configure them.

Some of the responsibilities like the merging of action based cluster privileges
are now pushed at cluster permission level. How to implement the predicate
(using Automaton) is being now enforced by cluster permission.

`ClusterPermission` helps in enforcing the cluster level access either by
performing checks against cluster action and optionally against a request.
It is a collection of one or more permission checks where if any of the checks
allow access then the permission allows access to a cluster action.

Implementations of cluster privilege must be able to provide information
regarding the predicates to the cluster permission so that can be enforced.
This is enforced by making implementations of cluster privilege aware of
cluster permission builder and provide a way to specify how the permission is
to be built for a given privilege.

This commit renames `ConditionalClusterPrivilege` to `ConfigurableClusterPrivilege`.
`ConfigurableClusterPrivilege` is a renderable cluster privilege exposed
as a `global` field in role descriptor.

Other than this there is a requirement where we would want to know if a cluster
permission is implied by another cluster-permission (`has-privileges`).
This is helpful in addressing queries related to privileges for a user.
This is not just simply checking of cluster permissions since we do not
have access to runtime information (like request object).
This refactoring does not try to address those scenarios.

Relates #44048
2019-08-13 09:06:18 +10:00
Armin Braun a9e1402189
Remove Settings from BaseRestRequest Constructor (#45418) (#45429)
* Resolving the todo, cleaning up the unused `settings` parameter
* Cleaning up some other minor dead code in affected classes
2019-08-12 05:14:45 +02:00
Alpar Torok 634a070430 Restrict which tasks can use testclusters (#45198)
* Restrict which tasks can use testclusters

This PR fixes a problem between the interaction of test-clusters and
build cache.
Before this any task could have used a cluster without tracking it as
input.
With this change a new interface is introduced to track the tasks that
can use clusters and we do consider the cluster as input for all of
them.
2019-08-09 13:38:01 +03:00
Ioannis Kakavas 99ddb8b3d8 Allow empty token endpoint for implicit flow (#45038)
When using the implicit flow in OpenID Connect, the
op.token_endpoint_url should not be mandatory as there is no need
to contact the token endpoint of the OP.
2019-08-08 12:50:53 +03:00
Yannick Welsch 7aeb2fe73c Add per-socket keepalive options (#44055)
Uses JDK 11's per-socket configuration of TCP keepalive (supported on Linux and Mac), see
https://bugs.openjdk.java.net/browse/JDK-8194298, and exposes these as transport settings.
By default, these options are disabled for now (i.e. fall-back to OS behavior), but we would like
to explore whether we can enable them by default, in particular to force keepalive configurations
that are better tuned for running ES.
2019-08-06 10:45:44 +02:00
Tim Brooks 984ba82251
Move nio channel initialization to event loop (#45155)
Currently in the transport-nio work we connect and bind channels on the
a thread before the channel is registered with a selector. Additionally,
it is at this point that we set all the socket options. This commit
moves these operations onto the event-loop after the channel has been
registered with a selector. It attempts to set the socket options for a
non-server channel at registration time. If that fails, it will attempt
to set the options after the channel is connected. This should fix
#41071.
2019-08-02 17:31:31 -04:00
Tim Vernum e21d58541a
Improve errors when TLS files cannot be read (#45122)
This change improves the exception messages that are thrown when the
system cannot read TLS resources such as keystores, truststores,
certificates, keys or certificate-chains (CAs).

This change specifically handles:

- Files that do not exist
- Files that cannot be read due to file-system permissions
- Files that cannot be read due to the ES security-manager

Backport of: #44787
2019-08-02 12:29:43 +10:00
Tim Vernum 590777150f
Explicitly fail if a realm only exists in keystore (#45091)
There are no realms that can be configured exclusively with secure
settings. Every realm that supports secure settings also requires one
or more non-secure settings.
However, sometimes a node will be configured with entries in the
keystore for which there is nothing in elasticsearch.yml - this may be
because the realm we removed from the yml, but not deleted from the
keystore, or it could be because there was a typo in the realm name
which has accidentially orphaned the keystore entry.

In these cases the realm building would fail, but the error would not
always be clear or point to the root cause (orphaned keystore
entries). RealmSettings would act as though the realm existed, but
then fail because an incorrect combination of settings was provided.

This change causes realm building to fail early, with an explicit
message about incorrect keystore entries.

Backport of: #44471
2019-08-02 12:28:59 +10:00
Yogesh Gaikwad ae5c01e2d2 Do not use scroll when finding duplicate API key (#45026)
When we create API key we check if the API key with the name
already exists. It searches with scroll enabled and this causes
the request to fail when creating large number of API keys in
parallel as it hits the number of open scroll limit (default 500).
We do not need the search context to be created so this commit
removes the scroll parameter from the search request for duplicate
API key.
2019-08-02 10:16:48 +10:00
Mark Vieira c13285a382
Remove unnecessary plugin application and project configuration (#45100) 2019-08-01 14:18:24 -07:00
Armin Braun c7d7230524
Stop Recreating Wrapped Handlers in RestController (#44964) (#45040)
* We shouldn't be recreating wrapped REST handlers over and over for every request. We only use this hook in x-pack and the wrapper there does not have any per request state.
  This is inefficient and could lead to some very unexpected memory behavior
   => I made the logic create the wrapper on handler registration and adjusted the x-pack wrapper implementation to correctly forward the circuit breaker and content stream flags
2019-07-31 17:11:34 +02:00
Tim Vernum 3c17d4379d
Expand logging when SAML Audience condition fails (#45027)
A mismatched configuration between the IdP and SP will often result in
SAML authentication attempts failing because the audience condition is
not met (because the IdP and SP disagree about the correct form of the
SP's Entity ID).

Previously the error message in this case did not provide sufficient
information to resolve the issue because the IdP's expected audience
would be truncated if it exceeeded 32 characters. Since the error did
not provide both IDs in full, it was not possible to determine the
correct fix (in detail) based on the error alone.

This change expands the message that is included in the thrown
exception, and also adds additional logging of every failed audience
condition, with diagnostics of the match failure.

Backport of: #44334
2019-07-31 19:40:17 +10:00
Tim Vernum f575370e2f
Fix broken short-circuit in getUnlicensedRealms (#44937)
The existing equals check was broken, and would always be false.

The correct behaviour is to return "Collections.emptyList()" whenever
the the active(licensed)-realms equals the configured-realms.

Backport of: #44399
2019-07-30 16:32:04 +10:00
Albert Zaharovits af937b14ae
SecurityIndexManager handle RuntimeEx while reading mapping (#44409)
Fixes exception handling while reading and parsing `.security-*`
mappings and templates.
2019-07-25 16:52:21 +03:00
Ioannis Kakavas 3714cb63da Allow parsing the value of java.version sysprop (#44017)
We often start testing with early access versions of new Java
versions and this have caused minor issues in our tests
(i.e. #43141) because the version string that the JVM reports
cannot be parsed as it ends with the string -ea.

This commit changes how we parse and compare Java versions to
allow correct parsing and comparison of the output of java.version
system property that might include an additional alphanumeric
part after the version numbers
 (see [JEP 223[(https://openjdk.java.net/jeps/223)). In short it 
handles a version number part, like before, but additionally a 
PRE part that matches ([a-zA-Z0-9]+).

It also changes a number of tests that would attempt to parse
java.specification.version in order to get the full version
of Java. java.specification.version only contains the major
version and is thus inappropriate when trying to compare against
a version that might contain a minor, patch or an early access
part. We know parse java.version that can be consistently
parsed.

Resolves #43141
2019-07-22 20:14:56 +03:00
Ryan Ernst edd26339c5
Convert remaining request classes in xpack core to writeable.reader (#44524) (#44534)
This commit converts all remaining classes extending ActionRequest
in xpack core to have a StreamInput constructor.

relates #34389
2019-07-18 01:11:45 -07:00
Tim Brooks 0a352486e8
Isolate nio channel registered from channel active (#44388)
Registering a channel with a selector is a required operation for the
channel to be handled properly. Currently, we mix the registeration with
other setup operations (ip filtering, SSL initiation, etc). However, a
fail to register is fatal. This PR modifies how registeration occurs to
immediately close the channel if it fails.

There are still two clear loopholes for how a user can interact with a
channel even if registration fails. 1. through the exception handler.
2. through the channel accepted callback. These can perhaps be improved
in the future. For now, this PR prevents writes from proceeding if the
channel is not registered.
2019-07-16 17:18:57 -06:00
Ryan Ernst c4cf98c538
Convert core security actions to use writeable ActionType (#44359) (#44390)
This commit converts all the StreamableResponseActionType security
classes in xpack core to ActionType, implementing Writeable for their
response classes.

relates #34389
2019-07-16 01:11:13 -07:00
Jason Tedor be98a12cd0
Do not swallow I/O exception getting authentication (#44398)
When getting authentication info from the thread context, it might be
that we encounter an I/O exception. Today we swallow this exception and
return a null authentication info to the caller. Yet, this could be
hiding bugs or errors. This commits adjusts this behavior so that we no
longer swallow the exception.
2019-07-16 16:14:15 +09:00
Ryan Ernst e0b82e92f3
Convert BaseNode(s) Request/Response classes to Writeable (#44301) (#44358)
This commit converts all BaseNodeResponse and BaseNodesResponse
subclasses to implement Writeable.Reader instead of Streamable.

relates #34389
2019-07-15 18:07:52 -07:00
Ryan Ernst 7e06888bae
Convert testclusters to use distro download plugin (#44253) (#44362)
Test clusters currently has its own set of logic for dealing with
finding different versions of Elasticsearch, downloading them, and
extracting them. This commit converts testclusters to use the
DistributionDownloadPlugin.
2019-07-15 17:53:05 -07:00
Ryan Ernst 1dcf53465c Reorder HandledTransportAction ctor args (#44291)
This commit moves the Supplier variant of HandledTransportAction to have
a different ordering than the Writeable.Reader variant. The Supplier
version is used for the legacy Streamable, and currently having the
location of the Writeable.Reader vs Supplier in the same place forces
using casts of Writeable.Reader to select the correct super constructor.
This change in ordering allows easier migration to Writeable.Reader.

relates #34389
2019-07-12 13:45:09 -07:00