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95 lines
3.0 KiB
Go
95 lines
3.0 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package capabilities
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import (
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"sync"
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)
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// Capabilities defines the set of capabilities available within the system.
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// For now these are global. Eventually they may be per-user
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type Capabilities struct {
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AllowPrivileged bool
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// Pod sources from which to allow privileged capabilities like host networking, sharing the host
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// IPC namespace, and sharing the host PID namespace.
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PrivilegedSources PrivilegedSources
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// PerConnectionBandwidthLimitBytesPerSec limits the throughput of each connection (currently only used for proxy, exec, attach)
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PerConnectionBandwidthLimitBytesPerSec int64
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}
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// PrivilegedSources defines the pod sources allowed to make privileged requests for certain types
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// of capabilities like host networking, sharing the host IPC namespace, and sharing the host PID namespace.
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type PrivilegedSources struct {
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// List of pod sources for which using host network is allowed.
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HostNetworkSources []string
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// List of pod sources for which using host pid namespace is allowed.
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HostPIDSources []string
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// List of pod sources for which using host ipc is allowed.
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HostIPCSources []string
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}
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var capInstance struct {
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once sync.Once
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lock sync.Mutex
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capabilities *Capabilities
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}
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// Initialize the capability set. This can only be done once per binary, subsequent calls are ignored.
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func Initialize(c Capabilities) {
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// Only do this once
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capInstance.once.Do(func() {
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capInstance.capabilities = &c
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})
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}
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// Setup the capability set. It wraps Initialize for improving usability.
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func Setup(allowPrivileged bool, perConnectionBytesPerSec int64) {
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Initialize(Capabilities{
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AllowPrivileged: allowPrivileged,
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PerConnectionBandwidthLimitBytesPerSec: perConnectionBytesPerSec,
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})
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}
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// SetForTests sets capabilities for tests. Convenience method for testing. This should only be called from tests.
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func SetForTests(c Capabilities) {
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capInstance.lock.Lock()
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defer capInstance.lock.Unlock()
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capInstance.capabilities = &c
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}
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// Get returns a read-only copy of the system capabilities.
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func Get() Capabilities {
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capInstance.lock.Lock()
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defer capInstance.lock.Unlock()
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// This check prevents clobbering of capabilities that might've been set via SetForTests
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if capInstance.capabilities == nil {
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Initialize(Capabilities{
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AllowPrivileged: false,
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PrivilegedSources: PrivilegedSources{
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HostNetworkSources: []string{},
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HostPIDSources: []string{},
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HostIPCSources: []string{},
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},
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})
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}
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return *capInstance.capabilities
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}
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