474 lines
14 KiB
C
474 lines
14 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/mman.h>
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#include <sys/socketvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <contrib/cloudabi/cloudabi_types_common.h>
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#include <compat/cloudabi/cloudabi_proto.h>
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#include <compat/cloudabi/cloudabi_util.h>
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/* Translation between CloudABI and Capsicum rights. */
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#define RIGHTS_MAPPINGS \
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MAPPING(CLOUDABI_RIGHT_FD_DATASYNC, CAP_FSYNC) \
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MAPPING(CLOUDABI_RIGHT_FD_READ, CAP_READ) \
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MAPPING(CLOUDABI_RIGHT_FD_SEEK, CAP_SEEK) \
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MAPPING(CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS, CAP_FCNTL) \
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MAPPING(CLOUDABI_RIGHT_FD_SYNC, CAP_FSYNC) \
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MAPPING(CLOUDABI_RIGHT_FD_TELL, CAP_SEEK_TELL) \
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MAPPING(CLOUDABI_RIGHT_FD_WRITE, CAP_WRITE) \
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MAPPING(CLOUDABI_RIGHT_FILE_ADVISE) \
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MAPPING(CLOUDABI_RIGHT_FILE_ALLOCATE, CAP_WRITE) \
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MAPPING(CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY, CAP_MKDIRAT) \
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MAPPING(CLOUDABI_RIGHT_FILE_CREATE_FILE, CAP_CREATE) \
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MAPPING(CLOUDABI_RIGHT_FILE_LINK_SOURCE, CAP_LINKAT_SOURCE) \
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MAPPING(CLOUDABI_RIGHT_FILE_LINK_TARGET, CAP_LINKAT_TARGET) \
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MAPPING(CLOUDABI_RIGHT_FILE_OPEN, CAP_LOOKUP) \
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MAPPING(CLOUDABI_RIGHT_FILE_READDIR, CAP_READ) \
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MAPPING(CLOUDABI_RIGHT_FILE_READLINK, CAP_LOOKUP) \
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MAPPING(CLOUDABI_RIGHT_FILE_RENAME_SOURCE, CAP_RENAMEAT_SOURCE) \
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MAPPING(CLOUDABI_RIGHT_FILE_RENAME_TARGET, CAP_RENAMEAT_TARGET) \
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MAPPING(CLOUDABI_RIGHT_FILE_STAT_FGET, CAP_FSTAT) \
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MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE, CAP_FTRUNCATE) \
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MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES, CAP_FUTIMES) \
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MAPPING(CLOUDABI_RIGHT_FILE_STAT_GET, CAP_FSTATAT) \
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MAPPING(CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES, CAP_FUTIMESAT) \
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MAPPING(CLOUDABI_RIGHT_FILE_SYMLINK, CAP_SYMLINKAT) \
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MAPPING(CLOUDABI_RIGHT_FILE_UNLINK, CAP_UNLINKAT) \
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MAPPING(CLOUDABI_RIGHT_MEM_MAP, CAP_MMAP) \
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MAPPING(CLOUDABI_RIGHT_MEM_MAP_EXEC, CAP_MMAP_X) \
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MAPPING(CLOUDABI_RIGHT_POLL_FD_READWRITE, CAP_EVENT) \
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MAPPING(CLOUDABI_RIGHT_POLL_PROC_TERMINATE, CAP_EVENT) \
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MAPPING(CLOUDABI_RIGHT_PROC_EXEC, CAP_FEXECVE) \
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MAPPING(CLOUDABI_RIGHT_SOCK_SHUTDOWN, CAP_SHUTDOWN) \
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int
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cloudabi_sys_fd_close(struct thread *td, struct cloudabi_sys_fd_close_args *uap)
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{
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return (kern_close(td, uap->fd));
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}
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int
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cloudabi_sys_fd_create1(struct thread *td,
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struct cloudabi_sys_fd_create1_args *uap)
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{
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struct filecaps fcaps = {};
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switch (uap->type) {
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case CLOUDABI_FILETYPE_SHARED_MEMORY:
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cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_FTRUNCATE,
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CAP_MMAP_RWX);
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return (kern_shm_open(td, SHM_ANON, O_RDWR, 0, &fcaps));
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default:
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return (EINVAL);
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}
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}
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int
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cloudabi_sys_fd_create2(struct thread *td,
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struct cloudabi_sys_fd_create2_args *uap)
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{
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int fds[2];
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int error, type;
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switch (uap->type) {
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case CLOUDABI_FILETYPE_SOCKET_DGRAM:
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type = SOCK_DGRAM;
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break;
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case CLOUDABI_FILETYPE_SOCKET_STREAM:
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type = SOCK_STREAM;
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break;
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default:
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return (EINVAL);
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}
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error = kern_socketpair(td, AF_UNIX, type, 0, fds);
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if (error == 0) {
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td->td_retval[0] = fds[0];
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td->td_retval[1] = fds[1];
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}
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return (0);
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}
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int
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cloudabi_sys_fd_datasync(struct thread *td,
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struct cloudabi_sys_fd_datasync_args *uap)
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{
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return (kern_fsync(td, uap->fd, false));
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}
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int
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cloudabi_sys_fd_dup(struct thread *td, struct cloudabi_sys_fd_dup_args *uap)
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{
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return (kern_dup(td, FDDUP_NORMAL, 0, uap->from, 0));
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}
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int
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cloudabi_sys_fd_replace(struct thread *td,
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struct cloudabi_sys_fd_replace_args *uap)
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{
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int error;
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/*
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* CloudABI's equivalent to dup2(). CloudABI processes should
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* not depend on hardcoded file descriptor layouts, but simply
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* use the file descriptor numbers that are allocated by the
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* kernel. Duplicating file descriptors to arbitrary numbers
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* should not be done.
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*
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* Invoke kern_dup() with FDDUP_MUSTREPLACE, so that we return
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* EBADF when duplicating to a nonexistent file descriptor. Also
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* clear the return value, as this system call yields no return
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* value.
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*/
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error = kern_dup(td, FDDUP_MUSTREPLACE, 0, uap->from, uap->to);
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td->td_retval[0] = 0;
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return (error);
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}
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int
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cloudabi_sys_fd_seek(struct thread *td, struct cloudabi_sys_fd_seek_args *uap)
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{
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int whence;
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switch (uap->whence) {
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case CLOUDABI_WHENCE_CUR:
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whence = SEEK_CUR;
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break;
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case CLOUDABI_WHENCE_END:
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whence = SEEK_END;
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break;
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case CLOUDABI_WHENCE_SET:
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whence = SEEK_SET;
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break;
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default:
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return (EINVAL);
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}
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return (kern_lseek(td, uap->fd, uap->offset, whence));
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}
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/* Converts a file descriptor to a CloudABI file descriptor type. */
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cloudabi_filetype_t
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cloudabi_convert_filetype(const struct file *fp)
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{
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struct socket *so;
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struct vnode *vp;
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switch (fp->f_type) {
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case DTYPE_FIFO:
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return (CLOUDABI_FILETYPE_SOCKET_STREAM);
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case DTYPE_PIPE:
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return (CLOUDABI_FILETYPE_SOCKET_STREAM);
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case DTYPE_PROCDESC:
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return (CLOUDABI_FILETYPE_PROCESS);
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case DTYPE_SHM:
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return (CLOUDABI_FILETYPE_SHARED_MEMORY);
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case DTYPE_SOCKET:
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so = fp->f_data;
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switch (so->so_type) {
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case SOCK_DGRAM:
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return (CLOUDABI_FILETYPE_SOCKET_DGRAM);
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case SOCK_STREAM:
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return (CLOUDABI_FILETYPE_SOCKET_STREAM);
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default:
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return (CLOUDABI_FILETYPE_UNKNOWN);
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}
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case DTYPE_VNODE:
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vp = fp->f_vnode;
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switch (vp->v_type) {
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case VBLK:
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return (CLOUDABI_FILETYPE_BLOCK_DEVICE);
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case VCHR:
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return (CLOUDABI_FILETYPE_CHARACTER_DEVICE);
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case VDIR:
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return (CLOUDABI_FILETYPE_DIRECTORY);
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case VFIFO:
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return (CLOUDABI_FILETYPE_SOCKET_STREAM);
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case VLNK:
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return (CLOUDABI_FILETYPE_SYMBOLIC_LINK);
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case VREG:
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return (CLOUDABI_FILETYPE_REGULAR_FILE);
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case VSOCK:
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return (CLOUDABI_FILETYPE_SOCKET_STREAM);
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default:
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return (CLOUDABI_FILETYPE_UNKNOWN);
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}
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default:
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return (CLOUDABI_FILETYPE_UNKNOWN);
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}
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}
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/* Removes rights that conflict with the file descriptor type. */
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void
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cloudabi_remove_conflicting_rights(cloudabi_filetype_t filetype,
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cloudabi_rights_t *base, cloudabi_rights_t *inheriting)
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{
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/*
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* CloudABI has a small number of additional rights bits to
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* disambiguate between multiple purposes. Remove the bits that
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* don't apply to the type of the file descriptor.
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*
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* As file descriptor access modes (O_ACCMODE) has been fully
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* replaced by rights bits, CloudABI distinguishes between
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* rights that apply to the file descriptor itself (base) versus
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* rights of new file descriptors derived from them
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* (inheriting). The code below approximates the pair by
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* decomposing depending on the file descriptor type.
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*
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* We need to be somewhat accurate about which actions can
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* actually be performed on the file descriptor, as functions
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* like fcntl(fd, F_GETFL) are emulated on top of this.
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*/
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switch (filetype) {
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case CLOUDABI_FILETYPE_DIRECTORY:
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*base &= CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
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CLOUDABI_RIGHT_FD_SYNC | CLOUDABI_RIGHT_FILE_ADVISE |
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CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
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CLOUDABI_RIGHT_FILE_CREATE_FILE |
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CLOUDABI_RIGHT_FILE_LINK_SOURCE |
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CLOUDABI_RIGHT_FILE_LINK_TARGET |
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CLOUDABI_RIGHT_FILE_OPEN |
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CLOUDABI_RIGHT_FILE_READDIR |
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CLOUDABI_RIGHT_FILE_READLINK |
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CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
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CLOUDABI_RIGHT_FILE_RENAME_TARGET |
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CLOUDABI_RIGHT_FILE_STAT_FGET |
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CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
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CLOUDABI_RIGHT_FILE_STAT_GET |
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CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
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CLOUDABI_RIGHT_FILE_SYMLINK |
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CLOUDABI_RIGHT_FILE_UNLINK |
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CLOUDABI_RIGHT_POLL_FD_READWRITE;
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*inheriting &= CLOUDABI_RIGHT_FD_DATASYNC |
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CLOUDABI_RIGHT_FD_READ |
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CLOUDABI_RIGHT_FD_SEEK |
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CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
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CLOUDABI_RIGHT_FD_SYNC |
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CLOUDABI_RIGHT_FD_TELL |
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CLOUDABI_RIGHT_FD_WRITE |
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CLOUDABI_RIGHT_FILE_ADVISE |
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CLOUDABI_RIGHT_FILE_ALLOCATE |
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CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
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CLOUDABI_RIGHT_FILE_CREATE_FILE |
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CLOUDABI_RIGHT_FILE_LINK_SOURCE |
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CLOUDABI_RIGHT_FILE_LINK_TARGET |
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CLOUDABI_RIGHT_FILE_OPEN |
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CLOUDABI_RIGHT_FILE_READDIR |
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CLOUDABI_RIGHT_FILE_READLINK |
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CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
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CLOUDABI_RIGHT_FILE_RENAME_TARGET |
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CLOUDABI_RIGHT_FILE_STAT_FGET |
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CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
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CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
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CLOUDABI_RIGHT_FILE_STAT_GET |
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CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
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CLOUDABI_RIGHT_FILE_SYMLINK |
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CLOUDABI_RIGHT_FILE_UNLINK |
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CLOUDABI_RIGHT_MEM_MAP |
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CLOUDABI_RIGHT_MEM_MAP_EXEC |
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CLOUDABI_RIGHT_POLL_FD_READWRITE |
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CLOUDABI_RIGHT_PROC_EXEC;
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break;
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case CLOUDABI_FILETYPE_PROCESS:
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*base &= ~(CLOUDABI_RIGHT_FILE_ADVISE |
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CLOUDABI_RIGHT_POLL_FD_READWRITE);
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*inheriting = 0;
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break;
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case CLOUDABI_FILETYPE_REGULAR_FILE:
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*base &= CLOUDABI_RIGHT_FD_DATASYNC |
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CLOUDABI_RIGHT_FD_READ |
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CLOUDABI_RIGHT_FD_SEEK |
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CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
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CLOUDABI_RIGHT_FD_SYNC |
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CLOUDABI_RIGHT_FD_TELL |
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CLOUDABI_RIGHT_FD_WRITE |
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CLOUDABI_RIGHT_FILE_ADVISE |
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CLOUDABI_RIGHT_FILE_ALLOCATE |
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CLOUDABI_RIGHT_FILE_STAT_FGET |
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CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
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CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
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CLOUDABI_RIGHT_MEM_MAP |
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CLOUDABI_RIGHT_MEM_MAP_EXEC |
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CLOUDABI_RIGHT_POLL_FD_READWRITE |
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CLOUDABI_RIGHT_PROC_EXEC;
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*inheriting = 0;
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break;
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case CLOUDABI_FILETYPE_SHARED_MEMORY:
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*base &= ~(CLOUDABI_RIGHT_FD_SEEK |
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CLOUDABI_RIGHT_FD_TELL |
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CLOUDABI_RIGHT_FILE_ADVISE |
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CLOUDABI_RIGHT_FILE_ALLOCATE |
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CLOUDABI_RIGHT_FILE_READDIR);
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*inheriting = 0;
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break;
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case CLOUDABI_FILETYPE_SOCKET_DGRAM:
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case CLOUDABI_FILETYPE_SOCKET_STREAM:
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*base &= CLOUDABI_RIGHT_FD_READ |
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CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
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CLOUDABI_RIGHT_FD_WRITE |
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CLOUDABI_RIGHT_FILE_STAT_FGET |
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CLOUDABI_RIGHT_POLL_FD_READWRITE |
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CLOUDABI_RIGHT_SOCK_SHUTDOWN;
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break;
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default:
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*inheriting = 0;
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break;
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}
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}
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/* Converts FreeBSD's Capsicum rights to CloudABI's set of rights. */
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static void
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convert_capabilities(const cap_rights_t *capabilities,
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cloudabi_filetype_t filetype, cloudabi_rights_t *base,
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cloudabi_rights_t *inheriting)
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{
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cloudabi_rights_t rights;
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/* Convert FreeBSD bits to CloudABI bits. */
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rights = 0;
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#define MAPPING(cloudabi, ...) do { \
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if (cap_rights_is_set(capabilities, ##__VA_ARGS__)) \
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rights |= (cloudabi); \
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} while (0);
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RIGHTS_MAPPINGS
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#undef MAPPING
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*base = rights;
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*inheriting = rights;
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cloudabi_remove_conflicting_rights(filetype, base, inheriting);
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}
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int
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cloudabi_sys_fd_stat_get(struct thread *td,
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struct cloudabi_sys_fd_stat_get_args *uap)
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{
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cloudabi_fdstat_t fsb = {0};
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struct file *fp;
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cap_rights_t rights;
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struct filecaps fcaps;
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int error, oflags;
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/* Obtain file descriptor properties. */
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error = fget_cap(td, uap->fd, cap_rights_init(&rights), &fp,
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&fcaps);
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if (error != 0)
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return (error);
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oflags = OFLAGS(fp->f_flag);
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fsb.fs_filetype = cloudabi_convert_filetype(fp);
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fdrop(fp, td);
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/* Convert file descriptor flags. */
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if (oflags & O_APPEND)
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fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND;
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if (oflags & O_NONBLOCK)
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fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK;
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if (oflags & O_SYNC)
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fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC;
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/* Convert capabilities to CloudABI rights. */
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convert_capabilities(&fcaps.fc_rights, fsb.fs_filetype,
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&fsb.fs_rights_base, &fsb.fs_rights_inheriting);
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filecaps_free(&fcaps);
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return (copyout(&fsb, (void *)uap->buf, sizeof(fsb)));
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}
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/* Converts CloudABI rights to a set of Capsicum capabilities. */
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int
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cloudabi_convert_rights(cloudabi_rights_t in, cap_rights_t *out)
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{
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cap_rights_init(out);
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#define MAPPING(cloudabi, ...) do { \
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if (in & (cloudabi)) { \
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cap_rights_set(out, ##__VA_ARGS__); \
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in &= ~(cloudabi); \
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} \
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} while (0);
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RIGHTS_MAPPINGS
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#undef MAPPING
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if (in != 0)
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return (ENOTCAPABLE);
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return (0);
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}
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int
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cloudabi_sys_fd_stat_put(struct thread *td,
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struct cloudabi_sys_fd_stat_put_args *uap)
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{
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cloudabi_fdstat_t fsb;
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cap_rights_t rights;
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int error, oflags;
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error = copyin(uap->buf, &fsb, sizeof(fsb));
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if (error != 0)
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return (error);
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if (uap->flags == CLOUDABI_FDSTAT_FLAGS) {
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/* Convert flags. */
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oflags = 0;
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|
if (fsb.fs_flags & CLOUDABI_FDFLAG_APPEND)
|
|
oflags |= O_APPEND;
|
|
if (fsb.fs_flags & CLOUDABI_FDFLAG_NONBLOCK)
|
|
oflags |= O_NONBLOCK;
|
|
if (fsb.fs_flags & (CLOUDABI_FDFLAG_SYNC |
|
|
CLOUDABI_FDFLAG_DSYNC | CLOUDABI_FDFLAG_RSYNC))
|
|
oflags |= O_SYNC;
|
|
return (kern_fcntl(td, uap->fd, F_SETFL, oflags));
|
|
} else if (uap->flags == CLOUDABI_FDSTAT_RIGHTS) {
|
|
/* Convert rights. */
|
|
error = cloudabi_convert_rights(
|
|
fsb.fs_rights_base | fsb.fs_rights_inheriting, &rights);
|
|
if (error != 0)
|
|
return (error);
|
|
return (kern_cap_rights_limit(td, uap->fd, &rights));
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
cloudabi_sys_fd_sync(struct thread *td, struct cloudabi_sys_fd_sync_args *uap)
|
|
{
|
|
|
|
return (kern_fsync(td, uap->fd, true));
|
|
}
|