191 lines
5.7 KiB
Go
191 lines
5.7 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package linux
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// A Capability represents the ability to perform a privileged operation.
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type Capability int
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// Capabilities defined by Linux. Taken from the kernel's
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// include/uapi/linux/capability.h. See capabilities(7) or that file for more
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// detailed capability descriptions.
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const (
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CAP_CHOWN = Capability(0)
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CAP_DAC_OVERRIDE = Capability(1)
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CAP_DAC_READ_SEARCH = Capability(2)
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CAP_FOWNER = Capability(3)
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CAP_FSETID = Capability(4)
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CAP_KILL = Capability(5)
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CAP_SETGID = Capability(6)
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CAP_SETUID = Capability(7)
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CAP_SETPCAP = Capability(8)
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CAP_LINUX_IMMUTABLE = Capability(9)
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CAP_NET_BIND_SERVICE = Capability(10)
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CAP_NET_BROADCAST = Capability(11)
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CAP_NET_ADMIN = Capability(12)
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CAP_NET_RAW = Capability(13)
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CAP_IPC_LOCK = Capability(14)
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CAP_IPC_OWNER = Capability(15)
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CAP_SYS_MODULE = Capability(16)
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CAP_SYS_RAWIO = Capability(17)
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CAP_SYS_CHROOT = Capability(18)
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CAP_SYS_PTRACE = Capability(19)
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CAP_SYS_PACCT = Capability(20)
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CAP_SYS_ADMIN = Capability(21)
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CAP_SYS_BOOT = Capability(22)
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CAP_SYS_NICE = Capability(23)
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CAP_SYS_RESOURCE = Capability(24)
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CAP_SYS_TIME = Capability(25)
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CAP_SYS_TTY_CONFIG = Capability(26)
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CAP_MKNOD = Capability(27)
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CAP_LEASE = Capability(28)
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CAP_AUDIT_WRITE = Capability(29)
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CAP_AUDIT_CONTROL = Capability(30)
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CAP_SETFCAP = Capability(31)
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CAP_MAC_OVERRIDE = Capability(32)
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CAP_MAC_ADMIN = Capability(33)
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CAP_SYSLOG = Capability(34)
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CAP_WAKE_ALARM = Capability(35)
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CAP_BLOCK_SUSPEND = Capability(36)
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CAP_AUDIT_READ = Capability(37)
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// CAP_LAST_CAP is the highest-numbered capability.
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// Seach for "CAP_LAST_CAP" to find other places that need to change.
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CAP_LAST_CAP = CAP_AUDIT_READ
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)
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// Ok returns true if cp is a supported capability.
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func (cp Capability) Ok() bool {
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return cp >= 0 && cp <= CAP_LAST_CAP
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}
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// String returns the capability name.
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func (cp Capability) String() string {
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switch cp {
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case CAP_CHOWN:
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return "CAP_CHOWN"
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case CAP_DAC_OVERRIDE:
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return "CAP_DAC_OVERRIDE"
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case CAP_DAC_READ_SEARCH:
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return "CAP_DAC_READ_SEARCH"
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case CAP_FOWNER:
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return "CAP_FOWNER"
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case CAP_FSETID:
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return "CAP_FSETID"
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case CAP_KILL:
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return "CAP_KILL"
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case CAP_SETGID:
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return "CAP_SETGID"
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case CAP_SETUID:
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return "CAP_SETUID"
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case CAP_SETPCAP:
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return "CAP_SETPCAP"
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case CAP_LINUX_IMMUTABLE:
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return "CAP_LINUX_IMMUTABLE"
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case CAP_NET_BIND_SERVICE:
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return "CAP_NET_BIND_SERVICE"
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case CAP_NET_BROADCAST:
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return "CAP_NET_BROADCAST"
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case CAP_NET_ADMIN:
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return "CAP_NET_ADMIN"
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case CAP_NET_RAW:
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return "CAP_NET_RAW"
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case CAP_IPC_LOCK:
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return "CAP_IPC_LOCK"
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case CAP_IPC_OWNER:
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return "CAP_IPC_OWNER"
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case CAP_SYS_MODULE:
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return "CAP_SYS_MODULE"
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case CAP_SYS_RAWIO:
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return "CAP_SYS_RAWIO"
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case CAP_SYS_CHROOT:
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return "CAP_SYS_CHROOT"
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case CAP_SYS_PTRACE:
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return "CAP_SYS_PTRACE"
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case CAP_SYS_PACCT:
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return "CAP_SYS_PACCT"
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case CAP_SYS_ADMIN:
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return "CAP_SYS_ADMIN"
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case CAP_SYS_BOOT:
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return "CAP_SYS_BOOT"
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case CAP_SYS_NICE:
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return "CAP_SYS_NICE"
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case CAP_SYS_RESOURCE:
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return "CAP_SYS_RESOURCE"
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case CAP_SYS_TIME:
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return "CAP_SYS_TIME"
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case CAP_SYS_TTY_CONFIG:
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return "CAP_SYS_TTY_CONFIG"
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case CAP_MKNOD:
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return "CAP_MKNOD"
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case CAP_LEASE:
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return "CAP_LEASE"
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case CAP_AUDIT_WRITE:
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return "CAP_AUDIT_WRITE"
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case CAP_AUDIT_CONTROL:
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return "CAP_AUDIT_CONTROL"
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case CAP_SETFCAP:
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return "CAP_SETFCAP"
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case CAP_MAC_OVERRIDE:
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return "CAP_MAC_OVERRIDE"
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case CAP_MAC_ADMIN:
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return "CAP_MAC_ADMIN"
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case CAP_SYSLOG:
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return "CAP_SYSLOG"
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case CAP_WAKE_ALARM:
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return "CAP_WAKE_ALARM"
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case CAP_BLOCK_SUSPEND:
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return "CAP_BLOCK_SUSPEND"
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case CAP_AUDIT_READ:
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return "CAP_AUDIT_READ"
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default:
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return "UNKNOWN"
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}
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}
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// Version numbers used by the capget/capset syscalls, defined in Linux's
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// include/uapi/linux/capability.h.
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const (
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// LINUX_CAPABILITY_VERSION_1 causes the data pointer to be
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// interpreted as a pointer to a single cap_user_data_t. Since capability
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// sets are 64 bits and the "capability sets" in cap_user_data_t are 32
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// bits only, this causes the upper 32 bits to be implicitly 0.
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LINUX_CAPABILITY_VERSION_1 = 0x19980330
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// LINUX_CAPABILITY_VERSION_2 and LINUX_CAPABILITY_VERSION_3 cause the
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// data pointer to be interpreted as a pointer to an array of 2
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// cap_user_data_t, using the second to store the 32 MSB of each capability
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// set. Versions 2 and 3 are identical, but Linux printk's a warning on use
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// of version 2 due to a userspace API defect.
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LINUX_CAPABILITY_VERSION_2 = 0x20071026
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LINUX_CAPABILITY_VERSION_3 = 0x20080522
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// HighestCapabilityVersion is the highest supported
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// LINUX_CAPABILITY_VERSION_* version.
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HighestCapabilityVersion = LINUX_CAPABILITY_VERSION_3
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)
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// CapUserHeader is equivalent to Linux's cap_user_header_t.
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type CapUserHeader struct {
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Version uint32
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Pid int32
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}
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// CapUserData is equivalent to Linux's cap_user_data_t.
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type CapUserData struct {
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Effective uint32
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Permitted uint32
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Inheritable uint32
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}
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