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// Copyright 2018 psgo authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package capabilities provides a mapping from common kernel bit masks to the
// alphanumerical representation of kernel capabilities. See capabilities(7)
// for additional information.
package capabilities
var (
// capabilities are a mapping from a numerical value to the textual
// representation of a given capability. A map allows to easily check
// if a given value is included or not.
//
// NOTE: this map must be maintained and kept in sync with the
// ./include/uapi/linux/capability.h kernel header.
capabilities = map[uint]string{
0: "CHOWN",
1: "DAC_OVERRIDE",
2: "DAC_READ_SEARCH",
3: "FOWNER",
4: "FSETID",
5: "KILL",
6: "SETGID",
7: "SETUID",
8: "SETPCAP",
9: "LINUX_IMMUTABLE",
10: "NET_BIND_SERVICE",
11: "NET_BROADCAST",
12: "NET_ADMIN",
13: "NET_RAW",
14: "IPC_LOCK",
15: "IPC_OWNER",
16: "SYS_MODULE",
17: "SYS_RAWIO",
18: "SYS_CHROOT",
19: "SYS_PTRACE",
20: "SYS_PACCT",
21: "SYS_ADMIN",
22: "SYS_BOOT",
23: "SYS_NICE",
24: "SYS_RESOURCE",
25: "SYS_TIME",
26: "SYS_TTY_CONFIG",
27: "MKNOD",
28: "LEASE",
29: "AUDIT_WRITE",
30: "AUDIT_CONTROL",
31: "SETFCAP",
32: "MAC_OVERRIDE",
33: "MAC_ADMIN",
34: "SYSLOG",
35: "WAKE_ALARM",
36: "BLOCK_SUSPEND",
37: "AUDIT_READ",
}
// FullCAPs represents the value of a bitmask with a full capability
// set.
FullCAPs = uint64(0x3FFFFFFFFF)
)
// TranslateMask iterates over mask and returns a slice of corresponding
// capabilities. If a bit is out of range of known capabilities, it is set as
// "unknown" to catch potential regressions when new capabilities are added to
// the kernel.
func TranslateMask(mask uint64) []string {
caps := []string{}
for i := uint(0); i < 64; i++ {
if (mask>>i)&0x1 == 1 {
c, known := capabilities[i]
if !known {
c = "unknown"
}
caps = append(caps, c)
}
}
return caps
}
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