/*- * Copyright (c) 1999-2006 Robert N. M. Watson * All rights reserved. * * This software was developed by Robert Watson for the TrustedBSD Project. * * 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. */ /* * Developed by the TrustedBSD Project. * * ACL system calls and other functions common across different ACL types. * Type-specific routines go into subr_acl_<type>.c. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_mac.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/sysproto.h> #include <sys/fcntl.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mount.h> #include <sys/vnode.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/namei.h> #include <sys/file.h> #include <sys/filedesc.h> #include <sys/proc.h> #include <sys/sysent.h> #include <sys/acl.h> #include <security/mac/mac_framework.h> #include <vm/uma.h> uma_zone_t acl_zone; static int vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp); static int vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp); static int vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp); /* * These calls wrap the real vnode operations, and are called by the syscall * code once the syscall has converted the path or file descriptor to a vnode * (unlocked). The aclp pointer is assumed still to point to userland, so * this should not be consumed within the kernel except by syscall code. * Other code should directly invoke VOP_{SET,GET}ACL. */ /* * Given a vnode, set its ACL. */ static int vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp) { struct acl inkernacl; struct mount *mp; int error; error = copyin(aclp, &inkernacl, sizeof(struct acl)); if (error) return(error); error = vn_start_write(vp, &mp, V_WAIT | PCATCH); if (error != 0) return (error); VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); #ifdef MAC error = mac_vnode_check_setacl(td->td_ucred, vp, type, &inkernacl); if (error != 0) goto out; #endif error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td); #ifdef MAC out: #endif VOP_UNLOCK(vp, 0); vn_finished_write(mp); return(error); } /* * Given a vnode, get its ACL. */ static int vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp) { struct acl inkernelacl; int error; VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); #ifdef MAC error = mac_vnode_check_getacl(td->td_ucred, vp, type); if (error != 0) goto out; #endif error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td); #ifdef MAC out: #endif VOP_UNLOCK(vp, 0); if (error == 0) error = copyout(&inkernelacl, aclp, sizeof(struct acl)); return (error); } /* * Given a vnode, delete its ACL. */ static int vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type) { struct mount *mp; int error; error = vn_start_write(vp, &mp, V_WAIT | PCATCH); if (error) return (error); VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); #ifdef MAC error = mac_vnode_check_deleteacl(td->td_ucred, vp, type); if (error) goto out; #endif error = VOP_SETACL(vp, type, 0, td->td_ucred, td); #ifdef MAC out: #endif VOP_UNLOCK(vp, 0); vn_finished_write(mp); return (error); } /* * Given a vnode, check whether an ACL is appropriate for it */ static int vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type, struct acl *aclp) { struct acl inkernelacl; int error; error = copyin(aclp, &inkernelacl, sizeof(struct acl)); if (error) return(error); error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td); return (error); } /* * syscalls -- convert the path/fd to a vnode, and call vacl_whatever. Don't * need to lock, as the vacl_ code will get/release any locks required. */ /* * Given a file path, get an ACL for it */ int __acl_get_file(struct thread *td, struct __acl_get_file_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, get an ACL for it; don't follow links. */ int __acl_get_link(struct thread *td, struct __acl_get_link_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, set an ACL for it. */ int __acl_set_file(struct thread *td, struct __acl_set_file_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, set an ACL for it; don't follow links. */ int __acl_set_link(struct thread *td, struct __acl_set_link_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file descriptor, get an ACL for it. */ int __acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap) { struct file *fp; int vfslocked, error; error = getvnode(td->td_proc->p_fd, uap->filedes, &fp); if (error == 0) { vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp); fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); } return (error); } /* * Given a file descriptor, set an ACL for it. */ int __acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap) { struct file *fp; int vfslocked, error; error = getvnode(td->td_proc->p_fd, uap->filedes, &fp); if (error == 0) { vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp); fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); } return (error); } /* * Given a file path, delete an ACL from it. */ int __acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_delete(td, nd.ni_vp, uap->type); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, delete an ACL from it; don't follow links. */ int __acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_delete(td, nd.ni_vp, uap->type); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, delete an ACL from it. */ int __acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap) { struct file *fp; int vfslocked, error; error = getvnode(td->td_proc->p_fd, uap->filedes, &fp); if (error == 0) { vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); error = vacl_delete(td, fp->f_vnode, uap->type); fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); } return (error); } /* * Given a file path, check an ACL for it. */ int __acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file path, check an ACL for it; don't follow links. */ int __acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap) { struct nameidata nd; int vfslocked, error; NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td); error = namei(&nd); vfslocked = NDHASGIANT(&nd); if (error == 0) { error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp); NDFREE(&nd, 0); } VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Given a file descriptor, check an ACL for it. */ int __acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap) { struct file *fp; int vfslocked, error; error = getvnode(td->td_proc->p_fd, uap->filedes, &fp); if (error == 0) { vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp); fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); } return (error); } /* ARGUSED */ static void aclinit(void *dummy __unused) { acl_zone = uma_zcreate("ACL UMA zone", sizeof(struct acl), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); } SYSINIT(acls, SI_SUB_ACL, SI_ORDER_FIRST, aclinit, NULL);