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linux/fs/ncpfs/ioctl.c
Christoph Hellwig 8c744fb83d [PATCH] add a file_permission helper 
A few more callers of permission() just want to check for a different access
pattern on an already open file.  This patch adds a wrapper for permission()
that takes a file in preparation of per-mount read-only support and to clean
up the callers a little.  The helper is not intended for new code, everything
without the interface set in stone should use vfs_permission()

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:55:59 -08:00

654 lines
16 KiB
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/*
* ioctl.c
*
* Copyright (C) 1995, 1996 by Volker Lendecke
* Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
* Modified 1998, 1999 Wolfram Pienkoss for NLS
*
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/highuid.h>
#include <linux/vmalloc.h>
#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"
/* maximum limit for ncp_objectname_ioctl */
#define NCP_OBJECT_NAME_MAX_LEN 4096
/* maximum limit for ncp_privatedata_ioctl */
#define NCP_PRIVATE_DATA_MAX_LEN 8192
/* maximum negotiable packet size */
#define NCP_PACKET_SIZE_INTERNAL 65536
static int
ncp_get_fs_info(struct ncp_server * server, struct file *file,
struct ncp_fs_info __user *arg)
{
struct inode *inode = file->f_dentry->d_inode;
struct ncp_fs_info info;
if ((file_permission(file, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid)) {
return -EACCES;
}
if (copy_from_user(&info, arg, sizeof(info)))
return -EFAULT;
if (info.version != NCP_GET_FS_INFO_VERSION) {
DPRINTK("info.version invalid: %d\n", info.version);
return -EINVAL;
}
/* TODO: info.addr = server->m.serv_addr; */
SET_UID(info.mounted_uid, server->m.mounted_uid);
info.connection = server->connection;
info.buffer_size = server->buffer_size;
info.volume_number = NCP_FINFO(inode)->volNumber;
info.directory_id = NCP_FINFO(inode)->DosDirNum;
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int
ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
struct ncp_fs_info_v2 __user * arg)
{
struct inode *inode = file->f_dentry->d_inode;
struct ncp_fs_info_v2 info2;
if ((file_permission(file, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid)) {
return -EACCES;
}
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;
if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
DPRINTK("info.version invalid: %d\n", info2.version);
return -EINVAL;
}
info2.mounted_uid = server->m.mounted_uid;
info2.connection = server->connection;
info2.buffer_size = server->buffer_size;
info2.volume_number = NCP_FINFO(inode)->volNumber;
info2.directory_id = NCP_FINFO(inode)->DosDirNum;
info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
if (copy_to_user(arg, &info2, sizeof(info2)))
return -EFAULT;
return 0;
}
#ifdef CONFIG_NCPFS_NLS
/* Here we are select the iocharset and the codepage for NLS.
* Thanks Petr Vandrovec for idea and many hints.
*/
static int
ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
struct ncp_nls_ioctl user;
struct nls_table *codepage;
struct nls_table *iocharset;
struct nls_table *oldset_io;
struct nls_table *oldset_cp;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (server->root_setuped)
return -EBUSY;
if (copy_from_user(&user, arg, sizeof(user)))
return -EFAULT;
codepage = NULL;
user.codepage[NCP_IOCSNAME_LEN] = 0;
if (!user.codepage[0] || !strcmp(user.codepage, "default"))
codepage = load_nls_default();
else {
codepage = load_nls(user.codepage);
if (!codepage) {
return -EBADRQC;
}
}
iocharset = NULL;
user.iocharset[NCP_IOCSNAME_LEN] = 0;
if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
iocharset = load_nls_default();
NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
} else if (!strcmp(user.iocharset, "utf8")) {
iocharset = load_nls_default();
NCP_SET_FLAG(server, NCP_FLAG_UTF8);
} else {
iocharset = load_nls(user.iocharset);
if (!iocharset) {
unload_nls(codepage);
return -EBADRQC;
}
NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
}
oldset_cp = server->nls_vol;
server->nls_vol = codepage;
oldset_io = server->nls_io;
server->nls_io = iocharset;
if (oldset_cp)
unload_nls(oldset_cp);
if (oldset_io)
unload_nls(oldset_io);
return 0;
}
static int
ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
struct ncp_nls_ioctl user;
int len;
memset(&user, 0, sizeof(user));
if (server->nls_vol && server->nls_vol->charset) {
len = strlen(server->nls_vol->charset);
if (len > NCP_IOCSNAME_LEN)
len = NCP_IOCSNAME_LEN;
strncpy(user.codepage, server->nls_vol->charset, len);
user.codepage[len] = 0;
}
if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
strcpy(user.iocharset, "utf8");
else if (server->nls_io && server->nls_io->charset) {
len = strlen(server->nls_io->charset);
if (len > NCP_IOCSNAME_LEN)
len = NCP_IOCSNAME_LEN;
strncpy(user.iocharset, server->nls_io->charset, len);
user.iocharset[len] = 0;
}
if (copy_to_user(arg, &user, sizeof(user)))
return -EFAULT;
return 0;
}
#endif /* CONFIG_NCPFS_NLS */
int ncp_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct ncp_server *server = NCP_SERVER(inode);
int result;
struct ncp_ioctl_request request;
char* bouncebuffer;
void __user *argp = (void __user *)arg;
switch (cmd) {
case NCP_IOC_NCPREQUEST:
if ((file_permission(filp, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid)) {
return -EACCES;
}
if (copy_from_user(&request, argp, sizeof(request)))
return -EFAULT;
if ((request.function > 255)
|| (request.size >
NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
return -EINVAL;
}
bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
if (!bouncebuffer)
return -ENOMEM;
if (copy_from_user(bouncebuffer, request.data, request.size)) {
vfree(bouncebuffer);
return -EFAULT;
}
ncp_lock_server(server);
/* FIXME: We hack around in the server's structures
here to be able to use ncp_request */
server->has_subfunction = 0;
server->current_size = request.size;
memcpy(server->packet, bouncebuffer, request.size);
result = ncp_request2(server, request.function,
bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
if (result < 0)
result = -EIO;
else
result = server->reply_size;
ncp_unlock_server(server);
DPRINTK("ncp_ioctl: copy %d bytes\n",
result);
if (result >= 0)
if (copy_to_user(request.data, bouncebuffer, result))
result = -EFAULT;
vfree(bouncebuffer);
return result;
case NCP_IOC_CONN_LOGGED_IN:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
return -EINVAL;
if (server->root_setuped)
return -EBUSY;
server->root_setuped = 1;
return ncp_conn_logged_in(inode->i_sb);
case NCP_IOC_GET_FS_INFO:
return ncp_get_fs_info(server, filp, argp);
case NCP_IOC_GET_FS_INFO_V2:
return ncp_get_fs_info_v2(server, filp, argp);
case NCP_IOC_GETMOUNTUID2:
{
unsigned long tmp = server->m.mounted_uid;
if ((file_permission(filp, MAY_READ) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
if (put_user(tmp, (unsigned long __user *)argp))
return -EFAULT;
return 0;
}
case NCP_IOC_GETROOT:
{
struct ncp_setroot_ioctl sr;
if ((file_permission(filp, MAY_READ) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
if (server->m.mounted_vol[0]) {
struct dentry* dentry = inode->i_sb->s_root;
if (dentry) {
struct inode* inode = dentry->d_inode;
if (inode) {
sr.volNumber = NCP_FINFO(inode)->volNumber;
sr.dirEntNum = NCP_FINFO(inode)->dirEntNum;
sr.namespace = server->name_space[sr.volNumber];
} else
DPRINTK("ncpfs: s_root->d_inode==NULL\n");
} else
DPRINTK("ncpfs: s_root==NULL\n");
} else {
sr.volNumber = -1;
sr.namespace = 0;
sr.dirEntNum = 0;
}
if (copy_to_user(argp, &sr, sizeof(sr)))
return -EFAULT;
return 0;
}
case NCP_IOC_SETROOT:
{
struct ncp_setroot_ioctl sr;
__u32 vnum;
__le32 de;
__le32 dosde;
struct dentry* dentry;
if (!capable(CAP_SYS_ADMIN))
{
return -EACCES;
}
if (server->root_setuped) return -EBUSY;
if (copy_from_user(&sr, argp, sizeof(sr)))
return -EFAULT;
if (sr.volNumber < 0) {
server->m.mounted_vol[0] = 0;
vnum = NCP_NUMBER_OF_VOLUMES;
de = 0;
dosde = 0;
} else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
return -EINVAL;
} else if (ncp_mount_subdir(server, sr.volNumber,
sr.namespace, sr.dirEntNum,
&vnum, &de, &dosde)) {
return -ENOENT;
}
dentry = inode->i_sb->s_root;
server->root_setuped = 1;
if (dentry) {
struct inode* inode = dentry->d_inode;
if (inode) {
NCP_FINFO(inode)->volNumber = vnum;
NCP_FINFO(inode)->dirEntNum = de;
NCP_FINFO(inode)->DosDirNum = dosde;
} else
DPRINTK("ncpfs: s_root->d_inode==NULL\n");
} else
DPRINTK("ncpfs: s_root==NULL\n");
return 0;
}
#ifdef CONFIG_NCPFS_PACKET_SIGNING
case NCP_IOC_SIGN_INIT:
if ((file_permission(filp, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
if (argp) {
if (server->sign_wanted)
{
struct ncp_sign_init sign;
if (copy_from_user(&sign, argp, sizeof(sign)))
return -EFAULT;
memcpy(server->sign_root,sign.sign_root,8);
memcpy(server->sign_last,sign.sign_last,16);
server->sign_active = 1;
}
/* ignore when signatures not wanted */
} else {
server->sign_active = 0;
}
return 0;
case NCP_IOC_SIGN_WANTED:
if ((file_permission(filp, MAY_READ) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
if (put_user(server->sign_wanted, (int __user *)argp))
return -EFAULT;
return 0;
case NCP_IOC_SET_SIGN_WANTED:
{
int newstate;
if ((file_permission(filp, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
/* get only low 8 bits... */
if (get_user(newstate, (unsigned char __user *)argp))
return -EFAULT;
if (server->sign_active) {
/* cannot turn signatures OFF when active */
if (!newstate) return -EINVAL;
} else {
server->sign_wanted = newstate != 0;
}
return 0;
}
#endif /* CONFIG_NCPFS_PACKET_SIGNING */
#ifdef CONFIG_NCPFS_IOCTL_LOCKING
case NCP_IOC_LOCKUNLOCK:
if ((file_permission(filp, MAY_WRITE) != 0)
&& (current->uid != server->m.mounted_uid))
{
return -EACCES;
}
{
struct ncp_lock_ioctl rqdata;
int result;
if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
return -EFAULT;
if (rqdata.origin != 0)
return -EINVAL;
/* check for cmd */
switch (rqdata.cmd) {
case NCP_LOCK_EX:
case NCP_LOCK_SH:
if (rqdata.timeout == 0)
rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
break;
case NCP_LOCK_LOG:
rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT; /* has no effect */
case NCP_LOCK_CLEAR:
break;
default:
return -EINVAL;
}
/* locking needs both read and write access */
if ((result = ncp_make_open(inode, O_RDWR)) != 0)
{
return result;
}
result = -EIO;
if (!ncp_conn_valid(server))
goto outrel;
result = -EISDIR;
if (!S_ISREG(inode->i_mode))
goto outrel;
if (rqdata.cmd == NCP_LOCK_CLEAR)
{
result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
NCP_FINFO(inode)->file_handle,
rqdata.offset,
rqdata.length);
if (result > 0) result = 0; /* no such lock */
}
else
{
int lockcmd;
switch (rqdata.cmd)
{
case NCP_LOCK_EX: lockcmd=1; break;
case NCP_LOCK_SH: lockcmd=3; break;
default: lockcmd=0; break;
}
result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
NCP_FINFO(inode)->file_handle,
lockcmd,
rqdata.offset,
rqdata.length,
rqdata.timeout);
if (result > 0) result = -EAGAIN;
}
outrel:
ncp_inode_close(inode);
return result;
}
#endif /* CONFIG_NCPFS_IOCTL_LOCKING */
case NCP_IOC_GETOBJECTNAME:
if (current->uid != server->m.mounted_uid) {
return -EACCES;
}
{
struct ncp_objectname_ioctl user;
size_t outl;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
user.auth_type = server->auth.auth_type;
outl = user.object_name_len;
user.object_name_len = server->auth.object_name_len;
if (outl > user.object_name_len)
outl = user.object_name_len;
if (outl) {
if (copy_to_user(user.object_name,
server->auth.object_name,
outl)) return -EFAULT;
}
if (copy_to_user(argp, &user, sizeof(user)))
return -EFAULT;
return 0;
}
case NCP_IOC_SETOBJECTNAME:
if (current->uid != server->m.mounted_uid) {
return -EACCES;
}
{
struct ncp_objectname_ioctl user;
void* newname;
void* oldname;
size_t oldnamelen;
void* oldprivate;
size_t oldprivatelen;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
return -ENOMEM;
if (user.object_name_len) {
newname = ncp_kmalloc(user.object_name_len, GFP_USER);
if (!newname) return -ENOMEM;
if (copy_from_user(newname, user.object_name, user.object_name_len)) {
ncp_kfree_s(newname, user.object_name_len);
return -EFAULT;
}
} else {
newname = NULL;
}
/* enter critical section */
/* maybe that kfree can sleep so do that this way */
/* it is at least more SMP friendly (in future...) */
oldname = server->auth.object_name;
oldnamelen = server->auth.object_name_len;
oldprivate = server->priv.data;
oldprivatelen = server->priv.len;
server->auth.auth_type = user.auth_type;
server->auth.object_name_len = user.object_name_len;
server->auth.object_name = newname;
server->priv.len = 0;
server->priv.data = NULL;
/* leave critical section */
if (oldprivate) ncp_kfree_s(oldprivate, oldprivatelen);
if (oldname) ncp_kfree_s(oldname, oldnamelen);
return 0;
}
case NCP_IOC_GETPRIVATEDATA:
if (current->uid != server->m.mounted_uid) {
return -EACCES;
}
{
struct ncp_privatedata_ioctl user;
size_t outl;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
outl = user.len;
user.len = server->priv.len;
if (outl > user.len) outl = user.len;
if (outl) {
if (copy_to_user(user.data,
server->priv.data,
outl)) return -EFAULT;
}
if (copy_to_user(argp, &user, sizeof(user)))
return -EFAULT;
return 0;
}
case NCP_IOC_SETPRIVATEDATA:
if (current->uid != server->m.mounted_uid) {
return -EACCES;
}
{
struct ncp_privatedata_ioctl user;
void* new;
void* old;
size_t oldlen;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
return -ENOMEM;
if (user.len) {
new = ncp_kmalloc(user.len, GFP_USER);
if (!new) return -ENOMEM;
if (copy_from_user(new, user.data, user.len)) {
ncp_kfree_s(new, user.len);
return -EFAULT;
}
} else {
new = NULL;
}
/* enter critical section */
old = server->priv.data;
oldlen = server->priv.len;
server->priv.len = user.len;
server->priv.data = new;
/* leave critical section */
if (old) ncp_kfree_s(old, oldlen);
return 0;
}
#ifdef CONFIG_NCPFS_NLS
case NCP_IOC_SETCHARSETS:
return ncp_set_charsets(server, argp);
case NCP_IOC_GETCHARSETS:
return ncp_get_charsets(server, argp);
#endif /* CONFIG_NCPFS_NLS */
case NCP_IOC_SETDENTRYTTL:
if ((file_permission(filp, MAY_WRITE) != 0) &&
(current->uid != server->m.mounted_uid))
return -EACCES;
{
u_int32_t user;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
/* 20 secs at most... */
if (user > 20000)
return -EINVAL;
user = (user * HZ) / 1000;
server->dentry_ttl = user;
return 0;
}
case NCP_IOC_GETDENTRYTTL:
{
u_int32_t user = (server->dentry_ttl * 1000) / HZ;
if (copy_to_user(argp, &user, sizeof(user)))
return -EFAULT;
return 0;
}
}
/* #ifdef CONFIG_UID16 */
/* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
so we have this out of switch */
if (cmd == NCP_IOC_GETMOUNTUID) {
__kernel_uid_t uid = 0;
if ((file_permission(filp, MAY_READ) != 0)
&& (current->uid != server->m.mounted_uid)) {
return -EACCES;
}
SET_UID(uid, server->m.mounted_uid);
if (put_user(uid, (__kernel_uid_t __user *)argp))
return -EFAULT;
return 0;
}
/* #endif */
return -EINVAL;
}
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