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freebsd-dev/sys/bsm/audit_record.h
Pawel Jakub Dawidek 7008be5bd7 Change the cap_rights_t type from uint64_t to a structure that we can extend 
in the future in a backward compatible (API and ABI) way.

The cap_rights_t represents capability rights. We used to use one bit to
represent one right, but we are running out of spare bits. Currently the new
structure provides place for 114 rights (so 50 more than the previous
cap_rights_t), but it is possible to grow the structure to hold at least 285
rights, although we can make it even larger if 285 rights won't be enough.

The structure definition looks like this:

	struct cap_rights {
		uint64_t	cr_rights[CAP_RIGHTS_VERSION + 2];
	};

The initial CAP_RIGHTS_VERSION is 0.

The top two bits in the first element of the cr_rights[] array contain total
number of elements in the array - 2. This means if those two bits are equal to
0, we have 2 array elements.

The top two bits in all remaining array elements should be 0.
The next five bits in all array elements contain array index. Only one bit is
used and bit position in this five-bits range defines array index. This means
there can be at most five array elements in the future.

To define new right the CAPRIGHT() macro must be used. The macro takes two
arguments - an array index and a bit to set, eg.

	#define	CAP_PDKILL	CAPRIGHT(1, 0x0000000000000800ULL)

We still support aliases that combine few rights, but the rights have to belong
to the same array element, eg:

	#define	CAP_LOOKUP	CAPRIGHT(0, 0x0000000000000400ULL)
	#define	CAP_FCHMOD	CAPRIGHT(0, 0x0000000000002000ULL)

	#define	CAP_FCHMODAT	(CAP_FCHMOD | CAP_LOOKUP)

There is new API to manage the new cap_rights_t structure:

	cap_rights_t *cap_rights_init(cap_rights_t *rights, ...);
	void cap_rights_set(cap_rights_t *rights, ...);
	void cap_rights_clear(cap_rights_t *rights, ...);
	bool cap_rights_is_set(const cap_rights_t *rights, ...);

	bool cap_rights_is_valid(const cap_rights_t *rights);
	void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
	void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
	bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);

Capability rights to the cap_rights_init(), cap_rights_set(),
cap_rights_clear() and cap_rights_is_set() functions are provided by
separating them with commas, eg:

	cap_rights_t rights;

	cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT);

There is no need to terminate the list of rights, as those functions are
actually macros that take care of the termination, eg:

	#define	cap_rights_set(rights, ...)				\
		__cap_rights_set((rights), __VA_ARGS__, 0ULL)
	void __cap_rights_set(cap_rights_t *rights, ...);

Thanks to using one bit as an array index we can assert in those functions that
there are no two rights belonging to different array elements provided
together. For example this is illegal and will be detected, because CAP_LOOKUP
belongs to element 0 and CAP_PDKILL to element 1:

	cap_rights_init(&rights, CAP_LOOKUP | CAP_PDKILL);

Providing several rights that belongs to the same array's element this way is
correct, but is not advised. It should only be used for aliases definition.

This commit also breaks compatibility with some existing Capsicum system calls,
but I see no other way to do that. This should be fine as Capsicum is still
experimental and this change is not going to 9.x.

Sponsored by:	The FreeBSD Foundation
2013-09-05 00:09:56 +00:00

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/*-
* Copyright (c) 2005-2009 Apple Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* P4: //depot/projects/trustedbsd/openbsm/sys/bsm/audit_record.h#10
* $FreeBSD$
*/
#ifndef _BSM_AUDIT_RECORD_H_
#define _BSM_AUDIT_RECORD_H_
#include <sys/time.h> /* struct timeval */
#include <sys/caprights.h> /* cap_rights_t */
/*
* Token type identifiers.
*/
#define AUT_INVALID 0x00
#define AUT_OTHER_FILE32 0x11
#define AUT_OHEADER 0x12
#define AUT_TRAILER 0x13
#define AUT_HEADER32 0x14
#define AUT_HEADER32_EX 0x15
#define AUT_DATA 0x21
#define AUT_IPC 0x22
#define AUT_PATH 0x23
#define AUT_SUBJECT32 0x24
#define AUT_XATPATH 0x25
#define AUT_PROCESS32 0x26
#define AUT_RETURN32 0x27
#define AUT_TEXT 0x28
#define AUT_OPAQUE 0x29
#define AUT_IN_ADDR 0x2a
#define AUT_IP 0x2b
#define AUT_IPORT 0x2c
#define AUT_ARG32 0x2d
#define AUT_SOCKET 0x2e
#define AUT_SEQ 0x2f
#define AUT_ACL 0x30
#define AUT_ATTR 0x31
#define AUT_IPC_PERM 0x32
#define AUT_LABEL 0x33
#define AUT_GROUPS 0x34
#define AUT_ACE 0x35
#define AUT_PRIV 0x38
#define AUT_UPRIV 0x39
#define AUT_LIAISON 0x3a
#define AUT_NEWGROUPS 0x3b
#define AUT_EXEC_ARGS 0x3c
#define AUT_EXEC_ENV 0x3d
#define AUT_ATTR32 0x3e
#define AUT_UNAUTH 0x3f
#define AUT_XATOM 0x40
#define AUT_XOBJ 0x41
#define AUT_XPROTO 0x42
#define AUT_XSELECT 0x43
#define AUT_XCOLORMAP 0x44
#define AUT_XCURSOR 0x45
#define AUT_XFONT 0x46
#define AUT_XGC 0x47
#define AUT_XPIXMAP 0x48
#define AUT_XPROPERTY 0x49
#define AUT_XWINDOW 0x4a
#define AUT_XCLIENT 0x4b
#define AUT_CMD 0x51
#define AUT_EXIT 0x52
#define AUT_ZONENAME 0x60
#define AUT_HOST 0x70
#define AUT_ARG64 0x71
#define AUT_RETURN64 0x72
#define AUT_ATTR64 0x73
#define AUT_HEADER64 0x74
#define AUT_SUBJECT64 0x75
#define AUT_PROCESS64 0x77
#define AUT_OTHER_FILE64 0x78
#define AUT_HEADER64_EX 0x79
#define AUT_SUBJECT32_EX 0x7a
#define AUT_PROCESS32_EX 0x7b
#define AUT_SUBJECT64_EX 0x7c
#define AUT_PROCESS64_EX 0x7d
#define AUT_IN_ADDR_EX 0x7e
#define AUT_SOCKET_EX 0x7f
/*
* Pre-64-bit BSM, 32-bit tokens weren't explicitly named as '32'. We have
* compatibility defines.
*/
#define AUT_HEADER AUT_HEADER32
#define AUT_ARG AUT_ARG32
#define AUT_RETURN AUT_RETURN32
#define AUT_SUBJECT AUT_SUBJECT32
#define AUT_PROCESS AUT_PROCESS32
#define AUT_OTHER_FILE AUT_OTHER_FILE32
/*
* The values for the following token ids are not defined by BSM.
*
* XXXRW: Not sure how to handle these in OpenBSM yet, but I'll give them
* names more consistent with Sun's BSM. These originally came from Apple's
* BSM.
*/
#define AUT_SOCKINET32 0x80 /* XXX */
#define AUT_SOCKINET128 0x81 /* XXX */
#define AUT_SOCKUNIX 0x82 /* XXX */
#define AUT_RIGHTS 0x83
/* print values for the arbitrary token */
#define AUP_BINARY 0
#define AUP_OCTAL 1
#define AUP_DECIMAL 2
#define AUP_HEX 3
#define AUP_STRING 4
/* data-types for the arbitrary token */
#define AUR_BYTE 0
#define AUR_CHAR AUR_BYTE
#define AUR_SHORT 1
#define AUR_INT32 2
#define AUR_INT AUR_INT32
#define AUR_INT64 3
/* ... and their sizes */
#define AUR_BYTE_SIZE sizeof(u_char)
#define AUR_CHAR_SIZE AUR_BYTE_SIZE
#define AUR_SHORT_SIZE sizeof(uint16_t)
#define AUR_INT32_SIZE sizeof(uint32_t)
#define AUR_INT_SIZE AUR_INT32_SIZE
#define AUR_INT64_SIZE sizeof(uint64_t)
/* Modifiers for the header token */
#define PAD_NOTATTR 0x4000 /* nonattributable event */
#define PAD_FAILURE 0x8000 /* fail audit event */
#define AUDIT_MAX_GROUPS 16
/*
* A number of BSM versions are floating around and defined. Here are
* constants for them. OpenBSM uses the same token types, etc, used in the
* Solaris BSM version, but has a separate version number in order to
* identify a potentially different event identifier name space.
*/
#define AUDIT_HEADER_VERSION_OLDDARWIN 1 /* In retrospect, a mistake. */
#define AUDIT_HEADER_VERSION_SOLARIS 2
#define AUDIT_HEADER_VERSION_TSOL25 3
#define AUDIT_HEADER_VERSION_TSOL 4
#define AUDIT_HEADER_VERSION_OPENBSM10 10
#define AUDIT_HEADER_VERSION_OPENBSM11 11
#define AUDIT_HEADER_VERSION_OPENBSM AUDIT_HEADER_VERSION_OPENBSM11
#define AUT_TRAILER_MAGIC 0xb105
/* BSM library calls */
__BEGIN_DECLS
struct in_addr;
struct in6_addr;
struct ip;
struct ipc_perm;
struct kevent;
struct sockaddr;
struct sockaddr_in;
struct sockaddr_in6;
struct sockaddr_un;
#if defined(_KERNEL) || defined(KERNEL)
struct vnode_au_info;
#endif
int au_open(void);
int au_write(int d, token_t *m);
int au_close(int d, int keep, short event);
int au_close_buffer(int d, short event, u_char *buffer, size_t *buflen);
int au_close_token(token_t *tok, u_char *buffer, size_t *buflen);
token_t *au_to_file(const char *file, struct timeval tm);
token_t *au_to_header32_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm);
token_t *au_to_header32_ex_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm, struct auditinfo_addr *aia);
token_t *au_to_header64_tm(int rec_size, au_event_t e_type, au_emod_t e_mod,
struct timeval tm);
#if !defined(KERNEL) && !defined(_KERNEL)
token_t *au_to_header(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header_ex(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header32(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header64(int rec_size, au_event_t e_type, au_emod_t e_mod);
token_t *au_to_header32_ex(int rec_size, au_event_t e_type, au_emod_t e_mod);
#endif
token_t *au_to_me(void);
token_t *au_to_arg(char n, const char *text, uint32_t v);
token_t *au_to_arg32(char n, const char *text, uint32_t v);
token_t *au_to_arg64(char n, const char *text, uint64_t v);
#if defined(_KERNEL) || defined(KERNEL)
token_t *au_to_attr(struct vnode_au_info *vni);
token_t *au_to_attr32(struct vnode_au_info *vni);
token_t *au_to_attr64(struct vnode_au_info *vni);
#endif
token_t *au_to_data(char unit_print, char unit_type, char unit_count,
const char *p);
token_t *au_to_exit(int retval, int err);
token_t *au_to_groups(int *groups);
token_t *au_to_newgroups(uint16_t n, gid_t *groups);
token_t *au_to_in_addr(struct in_addr *internet_addr);
token_t *au_to_in_addr_ex(struct in6_addr *internet_addr);
token_t *au_to_ip(struct ip *ip);
token_t *au_to_ipc(char type, int id);
token_t *au_to_ipc_perm(struct ipc_perm *perm);
token_t *au_to_iport(uint16_t iport);
token_t *au_to_opaque(const char *data, uint16_t bytes);
token_t *au_to_path(const char *path);
token_t *au_to_privset(char *privtypestr, char *privstr);
token_t *au_to_process(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_process32(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_process64(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_process_ex(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_addr_t *tid);
token_t *au_to_process32_ex(au_id_t auid, uid_t euid, gid_t egid,
uid_t ruid, gid_t rgid, pid_t pid, au_asid_t sid,
au_tid_addr_t *tid);
token_t *au_to_process64_ex(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_addr_t *tid);
token_t *au_to_rights(cap_rights_t *rightsp);
token_t *au_to_return(char status, uint32_t ret);
token_t *au_to_return32(char status, uint32_t ret);
token_t *au_to_return64(char status, uint64_t ret);
token_t *au_to_seq(long audit_count);
token_t *au_to_socket_ex(u_short so_domain, u_short so_type,
struct sockaddr *sa_local, struct sockaddr *sa_remote);
token_t *au_to_sock_inet(struct sockaddr_in *so);
token_t *au_to_sock_inet32(struct sockaddr_in *so);
token_t *au_to_sock_inet128(struct sockaddr_in6 *so);
token_t *au_to_sock_unix(struct sockaddr_un *so);
token_t *au_to_subject(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_subject32(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_subject64(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_t *tid);
token_t *au_to_subject_ex(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_addr_t *tid);
token_t *au_to_subject32_ex(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_addr_t *tid);
token_t *au_to_subject64_ex(au_id_t auid, uid_t euid, gid_t egid, uid_t ruid,
gid_t rgid, pid_t pid, au_asid_t sid, au_tid_addr_t *tid);
#if defined(_KERNEL) || defined(KERNEL)
token_t *au_to_exec_args(char *args, int argc);
token_t *au_to_exec_env(char *envs, int envc);
#else
token_t *au_to_exec_args(char **argv);
token_t *au_to_exec_env(char **envp);
#endif
token_t *au_to_text(const char *text);
token_t *au_to_kevent(struct kevent *kev);
token_t *au_to_trailer(int rec_size);
token_t *au_to_upriv(char sorf, char *priv);
token_t *au_to_zonename(const char *zonename);
/*
* BSM library routines for converting between local and BSM constant spaces.
*/
int au_bsm_to_domain(u_short bsm_domain, int *local_domainp);
int au_bsm_to_errno(u_char bsm_error, int *errorp);
int au_bsm_to_fcntl_cmd(u_short bsm_fcntl_cmd, int *local_fcntl_cmdp);
int au_bsm_to_socket_type(u_short bsm_socket_type,
int *local_socket_typep);
u_short au_domain_to_bsm(int local_domain);
u_char au_errno_to_bsm(int local_errno);
u_short au_fcntl_cmd_to_bsm(int local_fcntl_command);
u_short au_socket_type_to_bsm(int local_socket_type);
__END_DECLS
#endif /* ! _BSM_AUDIT_RECORD_H_ */
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