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capability.h
/* * <sys/capability.h> * * Copyright (C) 1997 Aleph One * Copyright (C) 1997,8, 2008,19,20 Andrew G. Morgan <morgan@kernel.org> * * defunct POSIX.1e Standard: 25.2 Capabilities <sys/capability.h> */ #ifndef _SYS_CAPABILITY_H #define _SYS_CAPABILITY_H #ifdef __cplusplus extern "C" { #endif /* * This file complements the kernel file by providing prototype * information for the user library. */ #include <sys/types.h> #include <stdint.h> #include <linux/types.h> #ifndef __user #define __user #endif #include <linux/capability.h> /* * POSIX capability types */ /* * Opaque capability handle (defined internally by libcap) * internal capability representation */ typedef struct _cap_struct *cap_t; /* "external" capability representation is a (void *) */ /* * This is the type used to identify capabilities */ typedef int cap_value_t; /* * libcap initialized first unnamed capability of the running kernel. * capsh includes a runtime test to flag when this is larger than * what is known to libcap... Time for a new libcap release! */ extern cap_value_t cap_max_bits(void); /* * Set identifiers */ typedef enum { CAP_EFFECTIVE = 0, /* Specifies the effective flag */ CAP_PERMITTED = 1, /* Specifies the permitted flag */ CAP_INHERITABLE = 2 /* Specifies the inheritable flag */ } cap_flag_t; typedef enum { CAP_IAB_INH = 2, CAP_IAB_AMB = 3, CAP_IAB_BOUND = 4 } cap_iab_vector_t; /* * An opaque generalization of the inheritable bits that includes both * what ambient bits to raise and what bounding bits to *lower* (aka * drop). None of these bits once set, using cap_iab_set(), affect * the running process but are consulted, through the execve() system * call, by the kernel. Note, the ambient bits ('A') of the running * process are fragile with respect to other aspects of the "posix" * (cap_t) operations: most importantly, 'A' cannot ever hold bits not * present in the intersection of 'pI' and 'pP'. The kernel * immediately drops all ambient caps whenever such a situation * arises. Typically, the ambient bits are used to support a naive * capability inheritance model - at odds with the POSIX (sic) model * of inheritance where inherited (pI) capabilities need to also be * wanted by the executed binary (fI) in order to become raised * through exec. */ typedef struct cap_iab_s *cap_iab_t; /* * These are the states available to each capability */ typedef enum { CAP_CLEAR=0, /* The flag is cleared/disabled */ CAP_SET=1 /* The flag is set/enabled */ } cap_flag_value_t; /* * User-space capability manipulation routines */ typedef unsigned cap_mode_t; #define CAP_MODE_UNCERTAIN ((cap_mode_t) 0) #define CAP_MODE_NOPRIV ((cap_mode_t) 1) #define CAP_MODE_PURE1E_INIT ((cap_mode_t) 2) #define CAP_MODE_PURE1E ((cap_mode_t) 3) /* libcap/cap_alloc.c */ extern cap_t cap_dup(cap_t); extern int cap_free(void *); extern cap_t cap_init(void); extern cap_iab_t cap_iab_init(void); /* libcap/cap_flag.c */ extern int cap_get_flag(cap_t, cap_value_t, cap_flag_t, cap_flag_value_t *); extern int cap_set_flag(cap_t, cap_flag_t, int, const cap_value_t *, cap_flag_value_t); extern int cap_clear(cap_t); extern int cap_clear_flag(cap_t, cap_flag_t); extern cap_flag_value_t cap_iab_get_vector(cap_iab_t, cap_iab_vector_t, cap_value_t); extern int cap_iab_set_vector(cap_iab_t, cap_iab_vector_t, cap_value_t, cap_flag_value_t); extern int cap_iab_fill(cap_iab_t, cap_iab_vector_t, cap_t, cap_flag_t); /* libcap/cap_file.c */ extern cap_t cap_get_fd(int); extern cap_t cap_get_file(const char *); extern uid_t cap_get_nsowner(cap_t); extern int cap_set_fd(int, cap_t); extern int cap_set_file(const char *, cap_t); extern int cap_set_nsowner(cap_t, uid_t); /* libcap/cap_proc.c */ extern cap_t cap_get_proc(void); extern cap_t cap_get_pid(pid_t); extern int cap_set_proc(cap_t); extern int cap_get_bound(cap_value_t); extern int cap_drop_bound(cap_value_t); #define CAP_IS_SUPPORTED(cap) (cap_get_bound(cap) >= 0) extern int cap_get_ambient(cap_value_t); extern int cap_set_ambient(cap_value_t, cap_flag_value_t); extern int cap_reset_ambient(void); #define CAP_AMBIENT_SUPPORTED() (cap_get_ambient(CAP_CHOWN) >= 0) /* libcap/cap_extint.c */ extern ssize_t cap_size(cap_t); extern ssize_t cap_copy_ext(void *, cap_t, ssize_t); extern cap_t cap_copy_int(const void *); /* libcap/cap_text.c */ extern cap_t cap_from_text(const char *); extern char * cap_to_text(cap_t, ssize_t *); extern int cap_from_name(const char *, cap_value_t *); extern char * cap_to_name(cap_value_t); extern char * cap_iab_to_text(cap_iab_t iab); extern cap_iab_t cap_iab_from_text(const char *text); #define CAP_DIFFERS(result, flag) (((result) & (1 << (flag))) != 0) extern int cap_compare(cap_t, cap_t); /* libcap/cap_proc.c */ extern void cap_set_syscall(long int (*new_syscall)(long int, long int, long int, long int), long int (*new_syscall6)(long int, long int, long int, long int, long int, long int, long int)); extern int cap_set_mode(cap_mode_t flavor); extern cap_mode_t cap_get_mode(void); extern const char *cap_mode_name(cap_mode_t flavor); extern unsigned cap_get_secbits(void); extern int cap_set_secbits(unsigned bits); extern int cap_prctl(long int pr_cmd, long int arg1, long int arg2, long int arg3, long int arg4, long int arg5); extern int cap_prctlw(long int pr_cmd, long int arg1, long int arg2, long int arg3, long int arg4, long int arg5); extern int cap_setuid(uid_t uid); extern int cap_setgroups(gid_t gid, size_t ngroups, const gid_t groups[]); extern cap_iab_t cap_iab_get_proc(void); extern int cap_iab_set_proc(cap_iab_t iab); typedef struct cap_launch_s *cap_launch_t; extern cap_launch_t cap_new_launcher(const char *arg0, const char * const *argv, const char * const *envp); extern void cap_launcher_callback(cap_launch_t attr, int (callback_fn)(void *detail)); extern void cap_launcher_setuid(cap_launch_t attr, uid_t uid); extern void cap_launcher_setgroups(cap_launch_t attr, gid_t gid, int ngroups, const gid_t *groups); extern void cap_launcher_set_mode(cap_launch_t attr, cap_mode_t flavor); extern cap_iab_t cap_launcher_set_iab(cap_launch_t attr, cap_iab_t iab); extern void cap_launcher_set_chroot(cap_launch_t attr, const char *chroot); extern pid_t cap_launch(cap_launch_t attr, void *data); /* * system calls - look to libc for function to system call * mapping. Note, libcap does not use capset directly, but permits the * cap_set_syscall() to redirect the system call function. */ extern int capget(cap_user_header_t header, cap_user_data_t data); extern int capset(cap_user_header_t header, const cap_user_data_t data); /* deprecated - use cap_get_pid() */ extern int capgetp(pid_t pid, cap_t cap_d); /* not valid with filesystem capability support - use cap_set_proc() */ extern int capsetp(pid_t pid, cap_t cap_d); #ifdef __cplusplus } #endif #endif /* _SYS_CAPABILITY_H */