diff options
Diffstat (limited to 'libcap/include/sys/capability.h')
| -rw-r--r-- | libcap/include/sys/capability.h | 164 |
1 files changed, 146 insertions, 18 deletions
diff --git a/libcap/include/sys/capability.h b/libcap/include/sys/capability.h index 64ac50e..2db9972 100644 --- a/libcap/include/sys/capability.h +++ b/libcap/include/sys/capability.h @@ -2,7 +2,7 @@ * <sys/capability.h> * * Copyright (C) 1997 Aleph One - * Copyright (C) 1997-8,2008 Andrew G. Morgan <morgan@kernel.org> + * Copyright (C) 1997,8, 2008,19-22 Andrew G. Morgan <morgan@kernel.org> * * defunct POSIX.1e Standard: 25.2 Capabilities <sys/capability.h> */ @@ -15,19 +15,23 @@ extern "C" { #endif /* + * Provide a programmatic way to #ifdef around features. + */ +#define LIBCAP_MAJOR 2 +#define LIBCAP_MINOR 69 + +/* * 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> -#include <linux/xattr.h> /* * POSIX capability types @@ -48,14 +52,65 @@ typedef struct _cap_struct *cap_t; 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); + +/* + * cap_proc_root reads and (optionally: when root != NULL) changes + * libcap's notion of where the "/proc" filesystem is mounted. When + * the return value is NULL, it should be interpreted as the + * value "/proc". + * + * Note, this is a global value and not considered thread safe to + * write - so the client should take suitable care when changing + * it. + * + * Further, libcap will allocate a memory copy for storing the + * replacement root, and it is this kind of memory that is returned. + * So, when changing the value, the caller should + * cap_free(the-return-value) else cause a memory leak. + * + * Note, the library uses a destructor to clean up the live allocated + * value of the working setting. + */ +extern char *cap_proc_root(const char *root); + +/* * 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_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 */ @@ -67,11 +122,19 @@ typedef enum { /* * 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) +#define CAP_MODE_HYBRID ((cap_mode_t) 4) /* libcap/cap_alloc.c */ -extern cap_t cap_dup(cap_t); -extern int cap_free(void *); -extern cap_t cap_init(void); +extern cap_t cap_dup(cap_t); +extern int cap_free(void *); +extern cap_t cap_init(void); +extern cap_iab_t cap_iab_dup(cap_iab_t); +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 *); @@ -79,12 +142,28 @@ 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 int cap_fill_flag(cap_t cap_d, cap_flag_t to, + cap_t ref, cap_flag_t from); +extern int cap_fill(cap_t, cap_flag_t, cap_flag_t); + +#define CAP_DIFFERS(result, flag) (((result) & (1 << (flag))) != 0) +extern int cap_compare(cap_t, cap_t); +#define CAP_IAB_DIFFERS(result, vector) (((result) & (1 << (vector))) != 0) +extern int cap_iab_compare(cap_iab_t, cap_iab_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); @@ -93,13 +172,18 @@ 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 *); +extern ssize_t cap_size(cap_t cap_d); +extern ssize_t cap_copy_ext(void *cap_ext, cap_t cap_d, ssize_t length); +extern cap_t cap_copy_int(const void *cap_ext); +extern cap_t cap_copy_int_check(const void *cap_ext, ssize_t length); /* libcap/cap_text.c */ extern cap_t cap_from_text(const char *); @@ -107,12 +191,56 @@ 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); -#define CAP_DIFFERS(result, flag) (((result) & (1 << (flag))) != 0) -extern int cap_compare(cap_t, cap_t); +extern char * cap_iab_to_text(cap_iab_t iab); +extern cap_iab_t cap_iab_from_text(const char *text); -/* system calls - look to libc for function to system call mapping */ -extern int capset(cap_user_header_t header, cap_user_data_t data); -extern int capget(cap_user_header_t header, const cap_user_data_t data); +/* 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 cap_iab_t cap_iab_get_pid(pid_t); +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 cap_launch_t cap_func_launcher(int (callback_fn)(void *detail)); +extern int cap_launcher_callback(cap_launch_t attr, + int (callback_fn)(void *detail)); +extern int cap_launcher_setuid(cap_launch_t attr, uid_t uid); +extern int cap_launcher_setgroups(cap_launch_t attr, gid_t gid, + int ngroups, const gid_t *groups); +extern int 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 int cap_launcher_set_chroot(cap_launch_t attr, const char *chroot); +extern pid_t cap_launch(cap_launch_t attr, void *detail); + +/* + * 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); |