When a CSI volume is deleted while its plugin is not running, the
function `volAndPluginLookup` returns a `nil` plugin value resulting in a
panic in the request handler.
We use capped exponential backoff in several places in the code when handling
failures. The code we've copy-and-pasted all over has a check to see if the
backoff is greater than the limit, but this check happens after the bitshift and
we always increment the number of attempts. This causes an overflow with a
fairly small number of failures (ex. at one place I tested it occurs after only
24 iterations), resulting in a negative backoff which then never recovers. The
backoff becomes a tight loop consuming resources and/or DoS'ing a Nomad RPC
handler or an external API such as Vault. Note this doesn't occur in places
where we cap the number of iterations so the loop breaks (usually to return an
error), so long as the number of iterations is reasonable.
Introduce a helper with a check on the cap before the bitshift to avoid overflow in all
places this can occur.
Fixes: #18199
Co-authored-by: stswidwinski <stan.swidwinski@gmail.com>
* build: update to go1.21
* go: eliminate helpers in favor of min/max
* build: run go mod tidy
* build: swap depguard for semgrep
* command: fixup broken tls error check on go1.21
The `TestDrainer_AllTypes_NoDeadline` test has been flaky. It looks like this
might be because the final update of batch allocations to complete is improperly
updating the state store directly rather than by RPC. If the service jobs have
restarted in the meantime, the `allocClientStateSimulator` will have updated the
index on the allocations table and that will prevent the drainer from
unblocking (and being marked complete) when the batch jobs are written with an
earlier index.
This changeset attempts to fix that by making the update via RPC (as it normally
would be in real code).
We've seen test flakiness in the `TestJobEndpoint_Register_NonOverlapping` test,
which asserts that we don't try to placed allocations for blocked evals until
resources have been actually freed by setting the client status of the previous
alloc to complete.
The flaky assertion includes sorting the two allocations by CreateIndex and this
appears to be a non-stable sort in the context of the test run, which results in
failures that shouldn't exist. There's no reason to sort the allocations instead
of just examining them by ID. This changeset does so.
There are some refactorings that have to be made in the getter and state
where the api changed in `slices`
* Bump golang.org/x/exp
* Bump golang.org/x/exp in api
* Update job_endpoint_test
* [feedback] unexport sort function
ACL permissions for the search endpoints are done in three passes. The
first (the `sufficientSearchPerms` method) is for performance and coarsely
rejects requests based on the passed-in context parameter if the user has no
permissions to any object in that context. The second (the
`filteredSearchContexts` method) filters out contexts based on whether the user
has permissions either to the requested namespace or again by context (to catch
the "all" context). Finally, when iterating over the objects available, we do
the usual filtering in the iterator.
Internal testing found several bugs in this filtering:
* CSI plugins can be searched by any authenticated user.
* Variables can be searched if the user has `job:read` permissions to the
variable's namespace instead of `variable:list`.
* Variables cannot be searched by wildcard namespace.
This is an information leak of the plugin names and variable paths, which we
don't consider to be privileged information but intended to protect anyways.
This changeset fixes these bugs by ensuring CSI plugins are filtered in the 1st
and 2nd pass ACL filters, and changes variables to check `variable:list` in the
2nd pass filter unless the wildcard namespace is passed (at which point we'll
fallback to filtering in the iterator).
Fixes: CVE-2023-3300
Fixes: #17906
When claiming a CSI volume, we need to ensure the CSI node plugin is running
before we send any CSI RPCs. This extends even to the controller publish RPC
because it requires the storage provider's "external node ID" for the
client. This primarily impacts client restarts but also is a problem if the node
plugin exits (and fingerprints) while the allocation that needs a CSI volume
claim is being placed.
Unfortunately there's no mapping of volume to plugin ID available in the
jobspec, so we don't have enough information to wait on plugins until we either
get the volume from the server or retrieve the plugin ID from data we've
persisted on the client.
If we always require getting the volume from the server before making the claim,
a client restart for disconnected clients will cause all the allocations that
need CSI volumes to fail. Even while connected, checking in with the server to
verify the volume's plugin before trying to make a claim RPC is inherently racy,
so we'll leave that case as-is and it will fail the claim if the node plugin
needed to support a newly-placed allocation is flapping such that the node
fingerprint is changing.
This changeset persists a minimum subset of data about the volume and its plugin
in the client state DB, and retrieves that data during the CSI hook's prerun to
avoid re-claiming and remounting the volume unnecessarily.
This changeset also updates the RPC handler to use the external node ID from the
claim whenever it is available.
Fixes: #13028
In Consul 1.15.0, the Delete Token API was changed so as to return an error when
deleting a non-existent ACL token. This means that if Nomad successfully deletes
the token but fails to persist that fact, it will get stuck trying to delete a
non-existent token forever.
Update the token deletion function to ignore "not found" errors and treat them
as successful deletions.
Fixes: #17833
Given a deployment that has a `progress_deadline`, if a task group runs
out of reschedule attempts, allow it to fail at this time instead of
waiting until the `progress_deadline` is reached.
Fixes: #17260
Unlike nodes, jobs are allowed to be registered in the node pool `all`,
in which case all nodes are used for evaluating placements. When listing
jobs for the `all` node pool only those that are explicitly in this node
pool should be returned.
This complements the `env` parameter, so that the operator can author
tasks that don't share their Vault token with the workload when using
`image` filesystem isolation. As a result, more powerful tokens can be used
in a job definition, allowing it to use template stanzas to issue all kinds of
secrets (database secrets, Vault tokens with very specific policies, etc.),
without sharing that issuing power with the task itself.
This is accomplished by creating a directory called `private` within
the task's working directory, which shares many properties of
the `secrets` directory (tmpfs where possible, not accessible by
`nomad alloc fs` or Nomad's web UI), but isn't mounted into/bound to the
container.
If the `disable_file` parameter is set to `false` (its default), the Vault token
is also written to the NOMAD_SECRETS_DIR, so the default behavior is
backwards compatible. Even if the operator never changes the default,
they will still benefit from the improved behavior of Nomad never reading
the token back in from that - potentially altered - location.
In Nomad 1.5.3 we fixed a security bug that allowed bypass of ACL checks if the
request came thru a client node first. But this fix broke (knowingly) the
identification of many client-to-server RPCs. These will be now measured as if
they were anonymous. The reason for this is that many client-to-server RPCs do
not send the node secret and instead rely on the protection of mTLS.
This changeset ensures that the node secret is being sent with every
client-to-server RPC request. In a future version of Nomad we can add
enforcement on the server side, but this was left out of this changeset to
reduce risks to the safe upgrade path.
Sending the node secret as an auth token introduces a new problem during initial
introduction of a client. Clients send many RPCs concurrently with
`Node.Register`, but until the node is registered the node secret is unknown to
the server and will be rejected as invalid. This causes permission denied
errors.
To fix that, this changeset introduces a gate on having successfully made a
`Node.Register` RPC before any other RPCs can be sent (except for `Status.Ping`,
which we need earlier but which also ignores the error because that handler
doesn't do an authorization check). This ensures that we only send requests with
a node secret already known to the server. This also makes client startup a
little easier to reason about because we know `Node.Register` must succeed
first, and it should make for a good place to hook in future plans for secure
introduction of nodes. The tradeoff is that an existing client that has running
allocs will take slightly longer (a second or two) to transition to ready after
a restart, because the transition in `Node.UpdateStatus` is gated at the server
by first submitting `Node.UpdateAlloc` with client alloc updates.
If the dynamic port range for a node is set so that the min is equal to the max,
there's only one port available and this passes config validation. But the
scheduler panics when it tries to pick a random port. Only add the randomness
when there's more than one to pick from.
Adds a test for the behavior but also adjusts the commentary on a couple of the
existing tests that made it seem like this case was already covered if you
didn't look too closely.
Fixes: #17585
* jobspec: rename node pool scheduler_configuration
In HCL specifications we usually call configuration blocks `config`
instead of `configuration`.
* np: add memory oversubscription config
* np: make scheduler config ENT
Add structs and fields to support the Nomad Pools Governance Enterprise
feature of controlling node pool access via namespaces.
Nomad Enterprise allows users to specify a default node pool to be used
by jobs that don't specify one. In order to accomplish this, it's
necessary to distinguish between a job that explicitly uses the
`default` node pool and one that did not specify any.
If the `default` node pool is set during job canonicalization it's
impossible to do this, so this commit allows a job to have an empty node
pool value during registration but sets to `default` at the admission
controller mutator.
In order to guarantee state consistency the state store validates that
the job node pool is set and exists before inserting it.
When registering a node with a new node pool in a non-authoritative
region we can't create the node pool because this new pool will not be
replicated to other regions.
This commit modifies the node registration logic to only allow automatic
node pool creation in the authoritative region.
In non-authoritative regions, the client is registered, but the node
pool is not created. The client is kept in the `initialing` status until
its node pool is created in the authoritative region and replicated to
the client's region.
