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/*- * Copyright (c) 2008-2010 Robert N. M. Watson * All rights reserved. * * This software was developed at the University of Cambridge Computer * Laboratory with support from a grant from Google, Inc. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND 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 THE AUTHOR OR 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. * * $FreeBSD: release/9.1.0/sys/sys/capability.h 224987 2011-08-18 22:51:30Z jonathan $ */ /* * Definitions for FreeBSD capabilities facility. */ #ifndef _SYS_CAPABILITY_H_ #define _SYS_CAPABILITY_H_ #include <sys/cdefs.h> #include <sys/types.h> #include <sys/file.h> /* * Possible rights on capabilities. * * Notes: * Some system calls don't require a capability in order to perform an * operation on an fd. These include: close, dup, dup2. * * sendfile is authorized using CAP_READ on the file and CAP_WRITE on the * socket. * * mmap() and aio*() system calls will need special attention as they may * involve reads or writes depending a great deal on context. */ /* General file I/O. */ #define CAP_READ 0x0000000000000001ULL /* read/recv */ #define CAP_WRITE 0x0000000000000002ULL /* write/send */ #define CAP_MMAP 0x0000000000000004ULL /* mmap */ #define CAP_MAPEXEC 0x0000000000000008ULL /* mmap(2) as exec */ #define CAP_FEXECVE 0x0000000000000010ULL #define CAP_FSYNC 0x0000000000000020ULL #define CAP_FTRUNCATE 0x0000000000000040ULL #define CAP_SEEK 0x0000000000000080ULL /* VFS methods. */ #define CAP_FCHFLAGS 0x0000000000000100ULL #define CAP_FCHDIR 0x0000000000000200ULL #define CAP_FCHMOD 0x0000000000000400ULL #define CAP_FCHOWN 0x0000000000000800ULL #define CAP_FCNTL 0x0000000000001000ULL #define CAP_FPATHCONF 0x0000000000002000ULL #define CAP_FLOCK 0x0000000000004000ULL #define CAP_FSCK 0x0000000000008000ULL #define CAP_FSTAT 0x0000000000010000ULL #define CAP_FSTATFS 0x0000000000020000ULL #define CAP_FUTIMES 0x0000000000040000ULL #define CAP_CREATE 0x0000000000080000ULL #define CAP_DELETE 0x0000000000100000ULL #define CAP_MKDIR 0x0000000000200000ULL #define CAP_RMDIR 0x0000000000400000ULL #define CAP_MKFIFO 0x0000000000800000ULL /* Lookups - used to constrain *at() calls. */ #define CAP_LOOKUP 0x0000000001000000ULL /* Extended attributes. */ #define CAP_EXTATTR_DELETE 0x0000000002000000ULL #define CAP_EXTATTR_GET 0x0000000004000000ULL #define CAP_EXTATTR_LIST 0x0000000008000000ULL #define CAP_EXTATTR_SET 0x0000000010000000ULL /* Access Control Lists. */ #define CAP_ACL_CHECK 0x0000000020000000ULL #define CAP_ACL_DELETE 0x0000000040000000ULL #define CAP_ACL_GET 0x0000000080000000ULL #define CAP_ACL_SET 0x0000000100000000ULL /* Socket operations. */ #define CAP_ACCEPT 0x0000000200000000ULL #define CAP_BIND 0x0000000400000000ULL #define CAP_CONNECT 0x0000000800000000ULL #define CAP_GETPEERNAME 0x0000001000000000ULL #define CAP_GETSOCKNAME 0x0000002000000000ULL #define CAP_GETSOCKOPT 0x0000004000000000ULL #define CAP_LISTEN 0x0000008000000000ULL #define CAP_PEELOFF 0x0000010000000000ULL #define CAP_SETSOCKOPT 0x0000020000000000ULL #define CAP_SHUTDOWN 0x0000040000000000ULL #define CAP_SOCK_ALL \ (CAP_ACCEPT | CAP_BIND | CAP_CONNECT \ | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT \ | CAP_LISTEN | CAP_PEELOFF | CAP_SETSOCKOPT | CAP_SHUTDOWN) /* Mandatory Access Control. */ #define CAP_MAC_GET 0x0000080000000000ULL #define CAP_MAC_SET 0x0000100000000000ULL /* Methods on semaphores. */ #define CAP_SEM_GETVALUE 0x0000200000000000ULL #define CAP_SEM_POST 0x0000400000000000ULL #define CAP_SEM_WAIT 0x0000800000000000ULL /* kqueue events. */ #define CAP_POLL_EVENT 0x0001000000000000ULL #define CAP_POST_EVENT 0x0002000000000000ULL /* Strange and powerful rights that should not be given lightly. */ #define CAP_IOCTL 0x0004000000000000ULL #define CAP_TTYHOOK 0x0008000000000000ULL /* Process management via process descriptors. */ #define CAP_PDGETPID 0x0010000000000000ULL #define CAP_PDWAIT 0x0020000000000000ULL #define CAP_PDKILL 0x0040000000000000ULL /* The mask of all valid method rights. */ #define CAP_MASK_VALID 0x007fffffffffffffULL #ifdef _KERNEL #define IN_CAPABILITY_MODE(td) (td->td_ucred->cr_flags & CRED_FLAG_CAPMODE) /* * Create a capability to wrap a file object. */ int kern_capwrap(struct thread *td, struct file *fp, cap_rights_t rights, int *capfd); /* * Unwrap a capability if its rights mask is a superset of 'rights'. * * Unwrapping a non-capability is effectively a no-op; the value of fp_cap * is simply copied into fpp. */ int cap_funwrap(struct file *fp_cap, cap_rights_t rights, struct file **fpp); int cap_funwrap_mmap(struct file *fp_cap, cap_rights_t rights, u_char *maxprotp, struct file **fpp); /* * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to * extract the rights from a capability. However, this should not be used by * kernel code generally, instead cap_funwrap() should be used in order to * keep all access control in one place. */ cap_rights_t cap_rights(struct file *fp_cap); #else /* !_KERNEL */ __BEGIN_DECLS /* * cap_enter(): Cause the process to enter capability mode, which will * prevent it from directly accessing global namespaces. System calls will * be limited to process-local, process-inherited, or file descriptor * operations. If already in capability mode, a no-op. * * Currently, process-inherited operations are not properly handled -- in * particular, we're interested in things like waitpid(2), kill(2), etc, * being properly constrained. One possible solution is to introduce process * descriptors. */ int cap_enter(void); /* * cap_getmode(): Are we in capability mode? */ int cap_getmode(u_int* modep); /* * cap_new(): Create a new capability derived from an existing file * descriptor with the specified rights. If the existing file descriptor is * a capability, then the new rights must be a subset of the existing rights. */ int cap_new(int fd, cap_rights_t rights); /* * cap_getrights(): Query the rights on a capability. */ int cap_getrights(int fd, cap_rights_t *rightsp); __END_DECLS #endif /* !_KERNEL */ #endif /* !_SYS_CAPABILITY_H_ */