/*

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* <sys/capability.h>

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*

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* Copyright (C) 1997 Aleph One

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* Copyright (C) 1997,8, 2008,19,20 Andrew G. Morgan <morgan@kernel.org>

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*

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* defunct POSIX.1e Standard: 25.2 Capabilities <sys/capability.h>

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*/

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#ifndef _SYS_CAPABILITY_H

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#define _SYS_CAPABILITY_H

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#ifdef __cplusplus

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extern "C" {

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#endif

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/*

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* This file complements the kernel file by providing prototype

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* information for the user library.

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*/

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#include <sys/types.h>

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#include <stdint.h>

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#include <linux/types.h>

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#ifndef __user

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#define __user

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#endif

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#include <linux/capability.h>

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/*

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* POSIX capability types

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*/

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/*

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* Opaque capability handle (defined internally by libcap)

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* internal capability representation

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*/

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typedef struct _cap_struct *cap_t;

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/* "external" capability representation is a (void *) */

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/*

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* This is the type used to identify capabilities

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*/

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typedef int cap_value_t;

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/*

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* libcap initialized first unnamed capability of the running kernel.

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* capsh includes a runtime test to flag when this is larger than

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* what is known to libcap... Time for a new libcap release!

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*/

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extern cap_value_t cap_max_bits(void);

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/*

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* Set identifiers

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*/

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typedef enum {

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CAP_EFFECTIVE = 0, /* Specifies the effective flag */

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CAP_PERMITTED = 1, /* Specifies the permitted flag */

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CAP_INHERITABLE = 2 /* Specifies the inheritable flag */

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} cap_flag_t;

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typedef enum {

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CAP_IAB_INH = 2,

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CAP_IAB_AMB = 3,

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CAP_IAB_BOUND = 4

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} cap_iab_vector_t;

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/*

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* An opaque generalization of the inheritable bits that includes both

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* what ambient bits to raise and what bounding bits to *lower* (aka

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* drop). None of these bits once set, using cap_iab_set(), affect

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* the running process but are consulted, through the execve() system

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* call, by the kernel. Note, the ambient bits ('A') of the running

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* process are fragile with respect to other aspects of the "posix"

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* (cap_t) operations: most importantly, 'A' cannot ever hold bits not

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* present in the intersection of 'pI' and 'pP'. The kernel

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* immediately drops all ambient caps whenever such a situation

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* arises. Typically, the ambient bits are used to support a naive

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* capability inheritance model - at odds with the POSIX (sic) model

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* of inheritance where inherited (pI) capabilities need to also be

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* wanted by the executed binary (fI) in order to become raised

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* through exec.

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*/

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typedef struct cap_iab_s *cap_iab_t;

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/*

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* These are the states available to each capability

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*/

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typedef enum {

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CAP_CLEAR=0, /* The flag is cleared/disabled */

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CAP_SET=1 /* The flag is set/enabled */

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} cap_flag_value_t;

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/*

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* User-space capability manipulation routines

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*/

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typedef unsigned cap_mode_t;

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#define CAP_MODE_UNCERTAIN ((cap_mode_t) 0)

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#define CAP_MODE_NOPRIV ((cap_mode_t) 1)

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#define CAP_MODE_PURE1E_INIT ((cap_mode_t) 2)

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#define CAP_MODE_PURE1E ((cap_mode_t) 3)

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/* libcap/cap_alloc.c */

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extern cap_t cap_dup(cap_t);

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extern int cap_free(void *);

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extern cap_t cap_init(void);

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extern cap_iab_t cap_iab_init(void);

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/* libcap/cap_flag.c */

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extern int cap_get_flag(cap_t, cap_value_t, cap_flag_t, cap_flag_value_t *);

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extern int cap_set_flag(cap_t, cap_flag_t, int, const cap_value_t *,

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cap_flag_value_t);

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extern int cap_clear(cap_t);

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extern int cap_clear_flag(cap_t, cap_flag_t);

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extern cap_flag_value_t cap_iab_get_vector(cap_iab_t, cap_iab_vector_t,

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cap_value_t);

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extern int cap_iab_set_vector(cap_iab_t, cap_iab_vector_t, cap_value_t,

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cap_flag_value_t);

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extern int cap_iab_fill(cap_iab_t, cap_iab_vector_t, cap_t, cap_flag_t);

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/* libcap/cap_file.c */

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extern cap_t cap_get_fd(int);

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extern cap_t cap_get_file(const char *);

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extern uid_t cap_get_nsowner(cap_t);

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extern int cap_set_fd(int, cap_t);

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extern int cap_set_file(const char *, cap_t);

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extern int cap_set_nsowner(cap_t, uid_t);

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/* libcap/cap_proc.c */

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extern cap_t cap_get_proc(void);

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extern cap_t cap_get_pid(pid_t);

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extern int cap_set_proc(cap_t);

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extern int cap_get_bound(cap_value_t);

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extern int cap_drop_bound(cap_value_t);

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#define CAP_IS_SUPPORTED(cap) (cap_get_bound(cap) >= 0)

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extern int cap_get_ambient(cap_value_t);

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extern int cap_set_ambient(cap_value_t, cap_flag_value_t);

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extern int cap_reset_ambient(void);

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#define CAP_AMBIENT_SUPPORTED() (cap_get_ambient(CAP_CHOWN) >= 0)

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/* libcap/cap_extint.c */

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extern ssize_t cap_size(cap_t);

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extern ssize_t cap_copy_ext(void *, cap_t, ssize_t);

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extern cap_t cap_copy_int(const void *);

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/* libcap/cap_text.c */

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extern cap_t cap_from_text(const char *);

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extern char * cap_to_text(cap_t, ssize_t *);

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extern int cap_from_name(const char *, cap_value_t *);

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extern char * cap_to_name(cap_value_t);

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extern char * cap_iab_to_text(cap_iab_t iab);

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extern cap_iab_t cap_iab_from_text(const char *text);

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#define CAP_DIFFERS(result, flag) (((result) & (1 << (flag))) != 0)

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extern int cap_compare(cap_t, cap_t);

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/* libcap/cap_proc.c */

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extern void cap_set_syscall(long int (*new_syscall)(long int,

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long int, long int, long int),

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long int (*new_syscall6)(long int,

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long int, long int, long int,

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long int, long int, long int));

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extern int cap_set_mode(cap_mode_t flavor);

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extern cap_mode_t cap_get_mode(void);

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extern const char *cap_mode_name(cap_mode_t flavor);

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extern unsigned cap_get_secbits(void);

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extern int cap_set_secbits(unsigned bits);

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extern int cap_prctl(long int pr_cmd, long int arg1, long int arg2,

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long int arg3, long int arg4, long int arg5);

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extern int cap_prctlw(long int pr_cmd, long int arg1, long int arg2,

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long int arg3, long int arg4, long int arg5);

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extern int cap_setuid(uid_t uid);

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extern int cap_setgroups(gid_t gid, size_t ngroups, const gid_t groups[]);

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extern cap_iab_t cap_iab_get_proc(void);

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extern int cap_iab_set_proc(cap_iab_t iab);

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typedef struct cap_launch_s *cap_launch_t;

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extern cap_launch_t cap_new_launcher(const char *arg0, const char * const *argv,

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const char * const *envp);

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extern void cap_launcher_callback(cap_launch_t attr,

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int (callback_fn)(void *detail));

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extern void cap_launcher_setuid(cap_launch_t attr, uid_t uid);

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extern void cap_launcher_setgroups(cap_launch_t attr, gid_t gid,

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int ngroups, const gid_t *groups);

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extern void cap_launcher_set_mode(cap_launch_t attr, cap_mode_t flavor);

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extern cap_iab_t cap_launcher_set_iab(cap_launch_t attr, cap_iab_t iab);

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extern void cap_launcher_set_chroot(cap_launch_t attr, const char *chroot);

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extern pid_t cap_launch(cap_launch_t attr, void *data);

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/*

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* system calls - look to libc for function to system call

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* mapping. Note, libcap does not use capset directly, but permits the

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* cap_set_syscall() to redirect the system call function.

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*/

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extern int capget(cap_user_header_t header, cap_user_data_t data);

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extern int capset(cap_user_header_t header, const cap_user_data_t data);

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/* deprecated - use cap_get_pid() */

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extern int capgetp(pid_t pid, cap_t cap_d);

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/* not valid with filesystem capability support - use cap_set_proc() */

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extern int capsetp(pid_t pid, cap_t cap_d);

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#ifdef __cplusplus

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}

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#endif

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#endif /* _SYS_CAPABILITY_H */

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