Log Linux capabilities
This commit is contained in:
Arthur Barr
158
pkg/linux/capabilities/capabilities.go
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158
pkg/linux/capabilities/capabilities.go
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/*
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© Copyright IBM Corporation 2017
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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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// capabilities allows querying of information on Linux capabilities
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package capabilities
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import (
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"errors"
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"strconv"
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"strings"
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)
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// DetectCapabilities determines Linux capabilities, based on the contents of a Linux "status" file.
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// For example, the contents of file `/proc/1/status`
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func DetectCapabilities(status string) ([]string, error) {
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lines := strings.Split(status, "\n")
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for _, line := range lines {
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if strings.HasPrefix(strings.TrimSpace(line), "CapPrm:") {
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words := strings.Fields(line)
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cap, err := strconv.ParseUint(words[1], 16, 64)
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if err != nil {
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return nil, err
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}
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return getCapabilities(cap), nil
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}
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}
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return nil, errors.New("Unable to detect capabilities")
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}
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// getCapabilities converts an encoded uint64 into a slice of string names of Linux capabilities
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func getCapabilities(cap uint64) []string {
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caps := make([]string, 0, 37)
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if cap&0x0000000040000000 == 0x0000000040000000 {
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caps = append(caps, "AUDIT_CONTROL")
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}
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if cap&0x0000000020000000 == 0x0000000020000000 {
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caps = append(caps, "AUDIT_WRITE")
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}
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if cap&0x0000001000000000 == 0x0000001000000000 {
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caps = append(caps, "BLOCK_SUSPEND")
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}
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if cap&0x0000000000000001 == 0x0000000000000001 {
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caps = append(caps, "CHOWN")
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}
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if cap&0x0000000000000002 == 0x0000000000000002 {
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caps = append(caps, "DAC_OVERRIDE")
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}
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if cap&0x0000000000000004 == 0x0000000000000004 {
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caps = append(caps, "DAC_READ_SEARCH")
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}
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if cap&0x0000000000000008 == 0x0000000000000008 {
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caps = append(caps, "FOWNER")
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}
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if cap&0x0000000000000010 == 0x0000000000000010 {
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caps = append(caps, "FSETID")
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}
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if cap&0x0000000000004000 == 0x0000000000004000 {
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caps = append(caps, "IPC_LOCK")
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}
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if cap&0x0000000000008000 == 0x0000000000008000 {
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caps = append(caps, "IPC_OWNER")
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}
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if cap&0x0000000000000020 == 0x0000000000000020 {
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caps = append(caps, "KILL")
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}
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if cap&0x0000000010000000 == 0x0000000010000000 {
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caps = append(caps, "LEASE")
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}
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if cap&0x0000000000000200 == 0x0000000000000200 {
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caps = append(caps, "LINUX_IMMUTABLE")
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}
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if cap&0x0000000200000000 == 0x0000000200000000 {
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caps = append(caps, "MAC_ADMIN")
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}
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if cap&0x0000000100000000 == 0x0000000100000000 {
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caps = append(caps, "MAC_OVERRIDE")
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}
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if cap&0x0000000008000000 == 0x0000000008000000 {
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caps = append(caps, "MKNOD")
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}
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if cap&0x0000000000001000 == 0x0000000000001000 {
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caps = append(caps, "NET_ADMIN")
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}
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if cap&0x0000000000000400 == 0x0000000000000400 {
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caps = append(caps, "NET_BIND_SERVICE")
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}
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if cap&0x0000000000000800 == 0x0000000000000800 {
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caps = append(caps, "NET_BROADCAST")
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}
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if cap&0x0000000000002000 == 0x0000000000002000 {
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caps = append(caps, "NET_RAW")
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}
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if cap&0x0000000080000000 == 0x0000000080000000 {
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caps = append(caps, "SETFCAP")
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}
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if cap&0x0000000000000040 == 0x0000000000000040 {
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caps = append(caps, "SETGID")
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}
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if cap&0x0000000000000100 == 0x0000000000000100 {
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caps = append(caps, "SETPCAP")
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}
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if cap&0x0000000000000080 == 0x0000000000000080 {
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caps = append(caps, "SETUID")
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}
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if cap&0x0000000400000000 == 0x0000000400000000 {
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caps = append(caps, "SYSLOG")
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}
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if cap&0x0000000000200000 == 0x0000000000200000 {
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caps = append(caps, "SYS_ADMIN")
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}
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if cap&0x0000000000400000 == 0x0000000000400000 {
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caps = append(caps, "SYS_BOOT")
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}
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if cap&0x0000000000040000 == 0x0000000000040000 {
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caps = append(caps, "SYS_CHROOT")
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}
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if cap&0x0000000000010000 == 0x0000000000010000 {
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caps = append(caps, "SYS_MODULE")
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}
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if cap&0x0000000000800000 == 0x0000000000800000 {
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caps = append(caps, "SYS_NICE")
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}
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if cap&0x0000000000100000 == 0x0000000000100000 {
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caps = append(caps, "SYS_PACCT")
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}
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if cap&0x0000000000080000 == 0x0000000000080000 {
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caps = append(caps, "SYS_PTRACE")
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}
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if cap&0x0000000000020000 == 0x0000000000020000 {
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caps = append(caps, "SYS_RAWIO")
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}
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if cap&0x0000000001000000 == 0x0000000001000000 {
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caps = append(caps, "SYS_RESOURCE")
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}
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if cap&0x0000000002000000 == 0x0000000002000000 {
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caps = append(caps, "SYS_TIME")
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}
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if cap&0x0000000004000000 == 0x0000000004000000 {
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caps = append(caps, "SYS_TTY_CONFIG")
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}
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if cap&0x0000000800000000 == 0x0000000800000000 {
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caps = append(caps, "WAKE_ALARM")
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}
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return caps
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}
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39
pkg/linux/capabilities/capabilities_test.go
Normal file
39
pkg/linux/capabilities/capabilities_test.go
Normal file
@@ -0,0 +1,39 @@
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/*
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© Copyright IBM Corporation 2017
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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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"reflect"
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"testing"
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)
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var capTests = []struct {
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in uint64
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out []string
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}{
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{0x0000000040000000, []string{"AUDIT_CONTROL"}},
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// Default values when you run a Docker container without changing capabilities:
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{0x00000000a80425fb, []string{"AUDIT_WRITE", "CHOWN", "DAC_OVERRIDE", "FOWNER", "FSETID", "KILL", "MKNOD", "NET_BIND_SERVICE", "NET_RAW", "SETFCAP", "SETGID", "SETPCAP", "SETUID", "SYS_CHROOT"}},
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}
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func TestGetCapabilities(t *testing.T) {
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for _, table := range capTests {
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caps := getCapabilities(table.in)
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if !reflect.DeepEqual(caps, table.out) {
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t.Errorf("getCapabilities(%v) - expected %v, got %v", table.in, table.out, caps)
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}
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}
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}
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