029a6f5d92
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
563 lines
13 KiB
C
563 lines
13 KiB
C
/*-
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* Copyright (c) 1999-2006 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Developed by the TrustedBSD Project.
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*
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* ACL system calls and other functions common across different ACL types.
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* Type-specific routines go into subr_acl_<type>.c.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/capability.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/acl.h>
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#include <security/mac/mac_framework.h>
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CTASSERT(ACL_MAX_ENTRIES >= OLDACL_MAX_ENTRIES);
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MALLOC_DEFINE(M_ACL, "acl", "Access Control Lists");
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static int vacl_set_acl(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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static int vacl_get_acl(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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static int vacl_aclcheck(struct thread *td, struct vnode *vp,
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acl_type_t type, struct acl *aclp);
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int
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acl_copy_oldacl_into_acl(const struct oldacl *source, struct acl *dest)
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{
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int i;
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if (source->acl_cnt < 0 || source->acl_cnt > OLDACL_MAX_ENTRIES)
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return (EINVAL);
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bzero(dest, sizeof(*dest));
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dest->acl_cnt = source->acl_cnt;
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dest->acl_maxcnt = ACL_MAX_ENTRIES;
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for (i = 0; i < dest->acl_cnt; i++) {
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dest->acl_entry[i].ae_tag = source->acl_entry[i].ae_tag;
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dest->acl_entry[i].ae_id = source->acl_entry[i].ae_id;
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dest->acl_entry[i].ae_perm = source->acl_entry[i].ae_perm;
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}
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return (0);
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}
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int
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acl_copy_acl_into_oldacl(const struct acl *source, struct oldacl *dest)
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{
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int i;
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if (source->acl_cnt > OLDACL_MAX_ENTRIES)
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return (EINVAL);
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bzero(dest, sizeof(*dest));
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dest->acl_cnt = source->acl_cnt;
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for (i = 0; i < dest->acl_cnt; i++) {
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dest->acl_entry[i].ae_tag = source->acl_entry[i].ae_tag;
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dest->acl_entry[i].ae_id = source->acl_entry[i].ae_id;
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dest->acl_entry[i].ae_perm = source->acl_entry[i].ae_perm;
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}
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return (0);
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}
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/*
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* At one time, "struct ACL" was extended in order to add support for NFSv4
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* ACLs. Instead of creating compatibility versions of all the ACL-related
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* syscalls, they were left intact. It's possible to find out what the code
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* calling these syscalls (libc) expects basing on "type" argument - if it's
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* either ACL_TYPE_ACCESS_OLD or ACL_TYPE_DEFAULT_OLD (which previously were
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* known as ACL_TYPE_ACCESS and ACL_TYPE_DEFAULT), then it's the "struct
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* oldacl". If it's something else, then it's the new "struct acl". In the
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* latter case, the routines below just copyin/copyout the contents. In the
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* former case, they copyin the "struct oldacl" and convert it to the new
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* format.
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*/
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static int
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acl_copyin(void *user_acl, struct acl *kernel_acl, acl_type_t type)
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{
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int error;
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struct oldacl old;
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switch (type) {
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case ACL_TYPE_ACCESS_OLD:
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case ACL_TYPE_DEFAULT_OLD:
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error = copyin(user_acl, &old, sizeof(old));
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if (error != 0)
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break;
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acl_copy_oldacl_into_acl(&old, kernel_acl);
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break;
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default:
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error = copyin(user_acl, kernel_acl, sizeof(*kernel_acl));
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if (kernel_acl->acl_maxcnt != ACL_MAX_ENTRIES)
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return (EINVAL);
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}
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return (error);
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}
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static int
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acl_copyout(struct acl *kernel_acl, void *user_acl, acl_type_t type)
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{
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int error;
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struct oldacl old;
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switch (type) {
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case ACL_TYPE_ACCESS_OLD:
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case ACL_TYPE_DEFAULT_OLD:
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error = acl_copy_acl_into_oldacl(kernel_acl, &old);
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if (error != 0)
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break;
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error = copyout(&old, user_acl, sizeof(old));
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break;
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default:
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if (fuword32((char *)user_acl +
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offsetof(struct acl, acl_maxcnt)) != ACL_MAX_ENTRIES)
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return (EINVAL);
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error = copyout(kernel_acl, user_acl, sizeof(*kernel_acl));
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}
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return (error);
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}
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/*
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* Convert "old" type - ACL_TYPE_{ACCESS,DEFAULT}_OLD - into its "new"
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* counterpart. It's required for old (pre-NFSv4 ACLs) libc to work
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* with new kernel. Fixing 'type' for old binaries with new libc
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* is being done in lib/libc/posix1e/acl_support.c:_acl_type_unold().
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*/
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static int
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acl_type_unold(int type)
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{
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switch (type) {
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case ACL_TYPE_ACCESS_OLD:
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return (ACL_TYPE_ACCESS);
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case ACL_TYPE_DEFAULT_OLD:
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return (ACL_TYPE_DEFAULT);
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default:
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return (type);
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}
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}
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/*
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* These calls wrap the real vnode operations, and are called by the syscall
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* code once the syscall has converted the path or file descriptor to a vnode
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* (unlocked). The aclp pointer is assumed still to point to userland, so
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* this should not be consumed within the kernel except by syscall code.
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* Other code should directly invoke VOP_{SET,GET}ACL.
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*/
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/*
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* Given a vnode, set its ACL.
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*/
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static int
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vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl *inkernelacl;
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struct mount *mp;
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int error;
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inkernelacl = acl_alloc(M_WAITOK);
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error = acl_copyin(aclp, inkernelacl, type);
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if (error != 0)
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goto out;
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error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
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if (error != 0)
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goto out;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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#ifdef MAC
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error = mac_vnode_check_setacl(td->td_ucred, vp, type, inkernelacl);
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if (error != 0)
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goto out_unlock;
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#endif
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error = VOP_SETACL(vp, acl_type_unold(type), inkernelacl,
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td->td_ucred, td);
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#ifdef MAC
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out_unlock:
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#endif
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VOP_UNLOCK(vp, 0);
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vn_finished_write(mp);
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out:
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acl_free(inkernelacl);
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return (error);
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}
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/*
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* Given a vnode, get its ACL.
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*/
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static int
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vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl *inkernelacl;
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int error;
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inkernelacl = acl_alloc(M_WAITOK | M_ZERO);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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#ifdef MAC
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error = mac_vnode_check_getacl(td->td_ucred, vp, type);
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if (error != 0)
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goto out;
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#endif
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error = VOP_GETACL(vp, acl_type_unold(type), inkernelacl,
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td->td_ucred, td);
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#ifdef MAC
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out:
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#endif
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VOP_UNLOCK(vp, 0);
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if (error == 0)
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error = acl_copyout(inkernelacl, aclp, type);
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acl_free(inkernelacl);
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return (error);
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}
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/*
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* Given a vnode, delete its ACL.
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*/
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static int
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vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
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{
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struct mount *mp;
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int error;
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error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
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if (error != 0)
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return (error);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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#ifdef MAC
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error = mac_vnode_check_deleteacl(td->td_ucred, vp, type);
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if (error != 0)
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goto out;
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#endif
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error = VOP_SETACL(vp, acl_type_unold(type), 0, td->td_ucred, td);
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#ifdef MAC
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out:
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#endif
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VOP_UNLOCK(vp, 0);
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vn_finished_write(mp);
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return (error);
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}
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/*
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* Given a vnode, check whether an ACL is appropriate for it
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*/
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static int
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vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
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struct acl *aclp)
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{
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struct acl *inkernelacl;
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int error;
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inkernelacl = acl_alloc(M_WAITOK);
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error = acl_copyin(aclp, inkernelacl, type);
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if (error != 0)
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goto out;
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error = VOP_ACLCHECK(vp, acl_type_unold(type), inkernelacl,
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td->td_ucred, td);
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out:
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acl_free(inkernelacl);
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return (error);
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}
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/*
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* syscalls -- convert the path/fd to a vnode, and call vacl_whatever. Don't
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* need to lock, as the vacl_ code will get/release any locks required.
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*/
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/*
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* Given a file path, get an ACL for it
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*/
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int
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sys___acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
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error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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return (error);
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}
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/*
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* Given a file path, get an ACL for it; don't follow links.
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*/
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int
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sys___acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
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error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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return (error);
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}
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/*
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* Given a file path, set an ACL for it.
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*/
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int
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sys___acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
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error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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return (error);
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}
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/*
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* Given a file path, set an ACL for it; don't follow links.
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*/
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int
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sys___acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
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error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
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NDFREE(&nd, 0);
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}
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return (error);
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}
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/*
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* Given a file descriptor, get an ACL for it.
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*/
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int
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sys___acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
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{
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struct file *fp;
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cap_rights_t rights;
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int error;
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error = getvnode(td->td_proc->p_fd, uap->filedes,
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cap_rights_init(&rights, CAP_ACL_GET), &fp);
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if (error == 0) {
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error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp);
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fdrop(fp, td);
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}
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return (error);
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}
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/*
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* Given a file descriptor, set an ACL for it.
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*/
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int
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sys___acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
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{
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struct file *fp;
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cap_rights_t rights;
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int error;
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error = getvnode(td->td_proc->p_fd, uap->filedes,
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cap_rights_init(&rights, CAP_ACL_SET), &fp);
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if (error == 0) {
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error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp);
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fdrop(fp, td);
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}
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return (error);
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}
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/*
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* Given a file path, delete an ACL from it.
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*/
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int
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sys___acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
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error = vacl_delete(td, nd.ni_vp, uap->type);
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NDFREE(&nd, 0);
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}
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return (error);
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}
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/*
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* Given a file path, delete an ACL from it; don't follow links.
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*/
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int
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sys___acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
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error = namei(&nd);
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if (error == 0) {
|
|
error = vacl_delete(td, nd.ni_vp, uap->type);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, delete an ACL from it.
|
|
*/
|
|
int
|
|
sys___acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
|
|
{
|
|
struct file *fp;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes,
|
|
cap_rights_init(&rights, CAP_ACL_DELETE), &fp);
|
|
if (error == 0) {
|
|
error = vacl_delete(td, fp->f_vnode, uap->type);
|
|
fdrop(fp, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, check an ACL for it.
|
|
*/
|
|
int
|
|
sys___acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
if (error == 0) {
|
|
error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, check an ACL for it; don't follow links.
|
|
*/
|
|
int
|
|
sys___acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
|
|
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
if (error == 0) {
|
|
error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file descriptor, check an ACL for it.
|
|
*/
|
|
int
|
|
sys___acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
|
|
{
|
|
struct file *fp;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes,
|
|
cap_rights_init(&rights, CAP_ACL_CHECK), &fp);
|
|
if (error == 0) {
|
|
error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp);
|
|
fdrop(fp, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
struct acl *
|
|
acl_alloc(int flags)
|
|
{
|
|
struct acl *aclp;
|
|
|
|
aclp = malloc(sizeof(*aclp), M_ACL, flags);
|
|
if (aclp == NULL)
|
|
return (NULL);
|
|
|
|
aclp->acl_maxcnt = ACL_MAX_ENTRIES;
|
|
|
|
return (aclp);
|
|
}
|
|
|
|
void
|
|
acl_free(struct acl *aclp)
|
|
{
|
|
|
|
free(aclp, M_ACL);
|
|
}
|