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999b1e01e1
samba-mirror/source3/smbd/open.c
Jeremy Allison 999b1e01e1 r17249: Ensure we only set the FILE_WRITE_DATA on O_TRUNC 
in one place.
Jeremy.
(This used to be commit f326bae3e2)
2007-10-10 11:38:22 -05:00

2155 lines
59 KiB
C
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/*
Unix SMB/CIFS implementation.
file opening and share modes
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001-2004
Copyright (C) Volker Lendecke 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern struct generic_mapping file_generic_mapping;
extern struct current_user current_user;
extern userdom_struct current_user_info;
extern uint16 global_smbpid;
extern BOOL global_client_failed_oplock_break;
struct deferred_open_record {
BOOL delayed_for_oplocks;
SMB_DEV_T dev;
SMB_INO_T inode;
};
/****************************************************************************
fd support routines - attempt to do a dos_open.
****************************************************************************/
static BOOL fd_open(struct connection_struct *conn,
const char *fname,
files_struct *fsp,
int flags,
mode_t mode)
{
int sav;
#ifdef O_NOFOLLOW
if (!lp_symlinks(SNUM(conn))) {
flags |= O_NOFOLLOW;
}
#endif
fsp->fh->fd = SMB_VFS_OPEN(conn,fname,fsp,flags,mode);
sav = errno;
DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
fname, flags, (int)mode, fsp->fh->fd,
(fsp->fh->fd == -1) ? strerror(errno) : "" ));
errno = sav;
return fsp->fh->fd != -1;
}
/****************************************************************************
Close the file associated with a fsp.
****************************************************************************/
int fd_close(struct connection_struct *conn,
files_struct *fsp)
{
if (fsp->fh->fd == -1) {
return 0; /* What we used to call a stat open. */
}
if (fsp->fh->ref_count > 1) {
return 0; /* Shared handle. Only close last reference. */
}
return fd_close_posix(conn, fsp);
}
/****************************************************************************
Change the ownership of a file to that of the parent directory.
Do this by fd if possible.
****************************************************************************/
void change_owner_to_parent(connection_struct *conn,
files_struct *fsp,
const char *fname,
SMB_STRUCT_STAT *psbuf)
{
const char *parent_path = parent_dirname(fname);
SMB_STRUCT_STAT parent_st;
int ret;
ret = SMB_VFS_STAT(conn, parent_path, &parent_st);
if (ret == -1) {
DEBUG(0,("change_owner_to_parent: failed to stat parent "
"directory %s. Error was %s\n",
parent_path, strerror(errno) ));
return;
}
if (fsp && fsp->fh->fd != -1) {
become_root();
ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, parent_st.st_uid, (gid_t)-1);
unbecome_root();
if (ret == -1) {
DEBUG(0,("change_owner_to_parent: failed to fchown "
"file %s to parent directory uid %u. Error "
"was %s\n", fname,
(unsigned int)parent_st.st_uid,
strerror(errno) ));
}
DEBUG(10,("change_owner_to_parent: changed new file %s to "
"parent directory uid %u.\n", fname,
(unsigned int)parent_st.st_uid ));
} else {
/* We've already done an lstat into psbuf, and we know it's a
directory. If we can cd into the directory and the dev/ino
are the same then we can safely chown without races as
we're locking the directory in place by being in it. This
should work on any UNIX (thanks tridge :-). JRA.
*/
pstring saved_dir;
SMB_STRUCT_STAT sbuf;
if (!vfs_GetWd(conn,saved_dir)) {
DEBUG(0,("change_owner_to_parent: failed to get "
"current working directory\n"));
return;
}
/* Chdir into the new path. */
if (vfs_ChDir(conn, fname) == -1) {
DEBUG(0,("change_owner_to_parent: failed to change "
"current working directory to %s. Error "
"was %s\n", fname, strerror(errno) ));
goto out;
}
if (SMB_VFS_STAT(conn,".",&sbuf) == -1) {
DEBUG(0,("change_owner_to_parent: failed to stat "
"directory '.' (%s) Error was %s\n",
fname, strerror(errno)));
goto out;
}
/* Ensure we're pointing at the same place. */
if (sbuf.st_dev != psbuf->st_dev ||
sbuf.st_ino != psbuf->st_ino ||
sbuf.st_mode != psbuf->st_mode ) {
DEBUG(0,("change_owner_to_parent: "
"device/inode/mode on directory %s changed. "
"Refusing to chown !\n", fname ));
goto out;
}
become_root();
ret = SMB_VFS_CHOWN(conn, ".", parent_st.st_uid, (gid_t)-1);
unbecome_root();
if (ret == -1) {
DEBUG(10,("change_owner_to_parent: failed to chown "
"directory %s to parent directory uid %u. "
"Error was %s\n", fname,
(unsigned int)parent_st.st_uid, strerror(errno) ));
goto out;
}
DEBUG(10,("change_owner_to_parent: changed ownership of new "
"directory %s to parent directory uid %u.\n",
fname, (unsigned int)parent_st.st_uid ));
out:
vfs_ChDir(conn,saved_dir);
}
}
/****************************************************************************
Open a file.
****************************************************************************/
static NTSTATUS open_file(files_struct *fsp,
connection_struct *conn,
const char *fname,
SMB_STRUCT_STAT *psbuf,
int flags,
mode_t unx_mode,
uint32 access_mask, /* client requested access mask. */
uint32 open_access_mask) /* what we're actually using in the open. */
{
int accmode = (flags & O_ACCMODE);
int local_flags = flags;
BOOL file_existed = VALID_STAT(*psbuf);
fsp->fh->fd = -1;
errno = EPERM;
/* Check permissions */
/*
* This code was changed after seeing a client open request
* containing the open mode of (DENY_WRITE/read-only) with
* the 'create if not exist' bit set. The previous code
* would fail to open the file read only on a read-only share
* as it was checking the flags parameter directly against O_RDONLY,
* this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
* JRA.
*/
if (!CAN_WRITE(conn)) {
/* It's a read-only share - fail if we wanted to write. */
if(accmode != O_RDONLY) {
DEBUG(3,("Permission denied opening %s\n",fname));
return NT_STATUS_ACCESS_DENIED;
} else if(flags & O_CREAT) {
/* We don't want to write - but we must make sure that
O_CREAT doesn't create the file if we have write
access into the directory.
*/
flags &= ~O_CREAT;
local_flags &= ~O_CREAT;
}
}
/*
* This little piece of insanity is inspired by the
* fact that an NT client can open a file for O_RDONLY,
* but set the create disposition to FILE_EXISTS_TRUNCATE.
* If the client *can* write to the file, then it expects to
* truncate the file, even though it is opening for readonly.
* Quicken uses this stupid trick in backup file creation...
* Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
* for helping track this one down. It didn't bite us in 2.0.x
* as we always opened files read-write in that release. JRA.
*/
if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
DEBUG(10,("open_file: truncate requested on read-only open "
"for file %s\n",fname ));
local_flags = (flags & ~O_ACCMODE)|O_RDWR;
}
if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
(!file_existed && (local_flags & O_CREAT)) ||
((local_flags & O_TRUNC) == O_TRUNC) ) {
/*
* We can't actually truncate here as the file may be locked.
* open_file_ntcreate will take care of the truncate later. JRA.
*/
local_flags &= ~O_TRUNC;
#if defined(O_NONBLOCK) && defined(S_ISFIFO)
/*
* We would block on opening a FIFO with no one else on the
* other end. Do what we used to do and add O_NONBLOCK to the
* open flags. JRA.
*/
if (file_existed && S_ISFIFO(psbuf->st_mode)) {
local_flags |= O_NONBLOCK;
}
#endif
/* Don't create files with Microsoft wildcard characters. */
if ((local_flags & O_CREAT) && !file_existed &&
ms_has_wild(fname)) {
return NT_STATUS_OBJECT_NAME_INVALID;
}
/* Actually do the open */
if (!fd_open(conn, fname, fsp, local_flags, unx_mode)) {
DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
"(flags=%d)\n",
fname,strerror(errno),local_flags,flags));
return map_nt_error_from_unix(errno);
}
/* Inherit the ACL if the file was created. */
if ((local_flags & O_CREAT) && !file_existed) {
inherit_access_acl(conn, fname, unx_mode);
}
} else {
fsp->fh->fd = -1; /* What we used to call a stat open. */
}
if (!file_existed) {
int ret;
if (fsp->fh->fd == -1) {
ret = SMB_VFS_STAT(conn, fname, psbuf);
} else {
ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,psbuf);
/* If we have an fd, this stat should succeed. */
if (ret == -1) {
DEBUG(0,("Error doing fstat on open file %s "
"(%s)\n", fname,strerror(errno) ));
}
}
/* For a non-io open, this stat failing means file not found. JRA */
if (ret == -1) {
NTSTATUS status = map_nt_error_from_unix(errno);
fd_close(conn, fsp);
return status;
}
}
/*
* POSIX allows read-only opens of directories. We don't
* want to do this (we use a different code path for this)
* so catch a directory open and return an EISDIR. JRA.
*/
if(S_ISDIR(psbuf->st_mode)) {
fd_close(conn, fsp);
errno = EISDIR;
return NT_STATUS_FILE_IS_A_DIRECTORY;
}
fsp->mode = psbuf->st_mode;
fsp->inode = psbuf->st_ino;
fsp->dev = psbuf->st_dev;
fsp->vuid = current_user.vuid;
fsp->file_pid = global_smbpid;
fsp->can_lock = True;
fsp->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
if (!CAN_WRITE(conn)) {
fsp->can_write = False;
} else {
fsp->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ?
True : False;
}
fsp->print_file = False;
fsp->modified = False;
fsp->sent_oplock_break = NO_BREAK_SENT;
fsp->is_directory = False;
fsp->is_stat = False;
if (conn->aio_write_behind_list &&
is_in_path(fname, conn->aio_write_behind_list, conn->case_sensitive)) {
fsp->aio_write_behind = True;
}
string_set(&fsp->fsp_name,fname);
fsp->wcp = NULL; /* Write cache pointer. */
DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
*current_user_info.smb_name ?
current_user_info.smb_name : conn->user,fsp->fsp_name,
BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
conn->num_files_open + 1));
errno = 0;
return NT_STATUS_OK;
}
/*******************************************************************
Return True if the filename is one of the special executable types.
********************************************************************/
static BOOL is_executable(const char *fname)
{
if ((fname = strrchr_m(fname,'.'))) {
if (strequal(fname,".com") ||
strequal(fname,".dll") ||
strequal(fname,".exe") ||
strequal(fname,".sym")) {
return True;
}
}
return False;
}
/****************************************************************************
Check if we can open a file with a share mode.
Returns True if conflict, False if not.
****************************************************************************/
static BOOL share_conflict(struct share_mode_entry *entry,
uint32 access_mask,
uint32 share_access)
{
DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
"entry->share_access = 0x%x, "
"entry->private_options = 0x%x\n",
(unsigned int)entry->access_mask,
(unsigned int)entry->share_access,
(unsigned int)entry->private_options));
DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
(unsigned int)access_mask, (unsigned int)share_access));
if ((entry->access_mask & (FILE_WRITE_DATA|
FILE_APPEND_DATA|
FILE_READ_DATA|
FILE_EXECUTE|
DELETE_ACCESS)) == 0) {
DEBUG(10,("share_conflict: No conflict due to "
"entry->access_mask = 0x%x\n",
(unsigned int)entry->access_mask ));
return False;
}
if ((access_mask & (FILE_WRITE_DATA|
FILE_APPEND_DATA|
FILE_READ_DATA|
FILE_EXECUTE|
DELETE_ACCESS)) == 0) {
DEBUG(10,("share_conflict: No conflict due to "
"access_mask = 0x%x\n",
(unsigned int)access_mask ));
return False;
}
#if 1 /* JRA TEST - Superdebug. */
#define CHECK_MASK(num, am, right, sa, share) \
DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
(unsigned int)(num), (unsigned int)(am), \
(unsigned int)(right), (unsigned int)(am)&(right) )); \
DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
(unsigned int)(num), (unsigned int)(sa), \
(unsigned int)(share), (unsigned int)(sa)&(share) )); \
if (((am) & (right)) && !((sa) & (share))) { \
DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
(unsigned int)(share) )); \
return True; \
}
#else
#define CHECK_MASK(num, am, right, sa, share) \
if (((am) & (right)) && !((sa) & (share))) { \
DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
(unsigned int)(share) )); \
return True; \
}
#endif
CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
share_access, FILE_SHARE_WRITE);
CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
entry->share_access, FILE_SHARE_WRITE);
CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
share_access, FILE_SHARE_READ);
CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
entry->share_access, FILE_SHARE_READ);
CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
share_access, FILE_SHARE_DELETE);
CHECK_MASK(6, access_mask, DELETE_ACCESS,
entry->share_access, FILE_SHARE_DELETE);
DEBUG(10,("share_conflict: No conflict.\n"));
return False;
}
#if defined(DEVELOPER)
static void validate_my_share_entries(int num,
struct share_mode_entry *share_entry)
{
files_struct *fsp;
if (!procid_is_me(&share_entry->pid)) {
return;
}
if (is_deferred_open_entry(share_entry) &&
!open_was_deferred(share_entry->op_mid)) {
pstring str;
DEBUG(0, ("Got a deferred entry without a request: "
"PANIC: %s\n", share_mode_str(num, share_entry)));
smb_panic(str);
}
if (!is_valid_share_mode_entry(share_entry)) {
return;
}
fsp = file_find_dif(share_entry->dev, share_entry->inode,
share_entry->share_file_id);
if (!fsp) {
DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
share_mode_str(num, share_entry) ));
smb_panic("validate_my_share_entries: Cannot match a "
"share entry with an open file\n");
}
if (is_deferred_open_entry(share_entry) ||
is_unused_share_mode_entry(share_entry)) {
goto panic;
}
if ((share_entry->op_type == NO_OPLOCK) &&
(fsp->oplock_type == FAKE_LEVEL_II_OPLOCK)) {
/* Someone has already written to it, but I haven't yet
* noticed */
return;
}
if (((uint16)fsp->oplock_type) != share_entry->op_type) {
goto panic;
}
return;
panic:
{
pstring str;
DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
share_mode_str(num, share_entry) ));
slprintf(str, sizeof(str)-1, "validate_my_share_entries: "
"file %s, oplock_type = 0x%x, op_type = 0x%x\n",
fsp->fsp_name, (unsigned int)fsp->oplock_type,
(unsigned int)share_entry->op_type );
smb_panic(str);
}
}
#endif
static BOOL is_stat_open(uint32 access_mask)
{
return (access_mask &&
((access_mask & ~(SYNCHRONIZE_ACCESS| FILE_READ_ATTRIBUTES|
FILE_WRITE_ATTRIBUTES))==0) &&
((access_mask & (SYNCHRONIZE_ACCESS|FILE_READ_ATTRIBUTES|
FILE_WRITE_ATTRIBUTES)) != 0));
}
/****************************************************************************
Deal with share modes
Invarient: Share mode must be locked on entry and exit.
Returns -1 on error, or number of share modes on success (may be zero).
****************************************************************************/
static NTSTATUS open_mode_check(connection_struct *conn,
const char *fname,
struct share_mode_lock *lck,
uint32 access_mask,
uint32 share_access,
uint32 create_options,
BOOL *file_existed)
{
int i;
if(lck->num_share_modes == 0) {
return NT_STATUS_OK;
}
*file_existed = True;
if (is_stat_open(access_mask)) {
/* Stat open that doesn't trigger oplock breaks or share mode
* checks... ! JRA. */
return NT_STATUS_OK;
}
/* A delete on close prohibits everything */
if (lck->delete_on_close) {
return NT_STATUS_DELETE_PENDING;
}
/*
* Check if the share modes will give us access.
*/
#if defined(DEVELOPER)
for(i = 0; i < lck->num_share_modes; i++) {
validate_my_share_entries(i, &lck->share_modes[i]);
}
#endif
if (!lp_share_modes(SNUM(conn))) {
return NT_STATUS_OK;
}
/* Now we check the share modes, after any oplock breaks. */
for(i = 0; i < lck->num_share_modes; i++) {
if (!is_valid_share_mode_entry(&lck->share_modes[i])) {
continue;
}
/* someone else has a share lock on it, check to see if we can
* too */
if (share_conflict(&lck->share_modes[i],
access_mask, share_access)) {
return NT_STATUS_SHARING_VIOLATION;
}
}
return NT_STATUS_OK;
}
static BOOL is_delete_request(files_struct *fsp) {
return ((fsp->access_mask == DELETE_ACCESS) &&
(fsp->oplock_type == NO_OPLOCK));
}
/*
* 1) No files open at all or internal open: Grant whatever the client wants.
*
* 2) Exclusive (or batch) oplock around: If the requested access is a delete
* request, break if the oplock around is a batch oplock. If it's another
* requested access type, break.
*
* 3) Only level2 around: Grant level2 and do nothing else.
*/
static BOOL delay_for_oplocks(struct share_mode_lock *lck,
files_struct *fsp,
int pass_number,
int oplock_request)
{
int i;
struct share_mode_entry *exclusive = NULL;
BOOL valid_entry = False;
BOOL delay_it = False;
BOOL have_level2 = False;
if (oplock_request & INTERNAL_OPEN_ONLY) {
fsp->oplock_type = NO_OPLOCK;
}
if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
return False;
}
for (i=0; i<lck->num_share_modes; i++) {
if (!is_valid_share_mode_entry(&lck->share_modes[i])) {
continue;
}
/* At least one entry is not an invalid or deferred entry. */
valid_entry = True;
if (pass_number == 1) {
if (BATCH_OPLOCK_TYPE(lck->share_modes[i].op_type)) {
SMB_ASSERT(exclusive == NULL);
exclusive = &lck->share_modes[i];
}
} else {
if (EXCLUSIVE_OPLOCK_TYPE(lck->share_modes[i].op_type)) {
SMB_ASSERT(exclusive == NULL);
exclusive = &lck->share_modes[i];
}
}
if (lck->share_modes[i].op_type == LEVEL_II_OPLOCK) {
SMB_ASSERT(exclusive == NULL);
have_level2 = True;
}
}
if (!valid_entry) {
/* All entries are placeholders or deferred.
* Directly grant whatever the client wants. */
if (fsp->oplock_type == NO_OPLOCK) {
/* Store a level2 oplock, but don't tell the client */
fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
}
return False;
}
if (exclusive != NULL) { /* Found an exclusive oplock */
SMB_ASSERT(!have_level2);
delay_it = is_delete_request(fsp) ?
BATCH_OPLOCK_TYPE(exclusive->op_type) : True;
}
if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
/* We can at most grant level2 as there are other
* level2 or NO_OPLOCK entries. */
fsp->oplock_type = LEVEL_II_OPLOCK;
}
if ((fsp->oplock_type == NO_OPLOCK) && have_level2) {
/* Store a level2 oplock, but don't tell the client */
fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
}
if (delay_it) {
BOOL ret;
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
DEBUG(10, ("Sending break request to PID %s\n",
procid_str_static(&exclusive->pid)));
exclusive->op_mid = get_current_mid();
/* Create the message. */
share_mode_entry_to_message(msg, exclusive);
/* Add in the FORCE_OPLOCK_BREAK_TO_NONE bit in the message if set. We don't
want this set in the share mode struct pointed to by lck. */
if (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE) {
SSVAL(msg,6,exclusive->op_type | FORCE_OPLOCK_BREAK_TO_NONE);
}
become_root();
ret = message_send_pid(exclusive->pid, MSG_SMB_BREAK_REQUEST,
msg, MSG_SMB_SHARE_MODE_ENTRY_SIZE, True);
unbecome_root();
if (!ret) {
DEBUG(3, ("Could not send oplock break message\n"));
}
}
return delay_it;
}
static BOOL request_timed_out(struct timeval request_time,
struct timeval timeout)
{
struct timeval now, end_time;
GetTimeOfDay(&now);
end_time = timeval_sum(&request_time, &timeout);
return (timeval_compare(&end_time, &now) < 0);
}
/****************************************************************************
Handle the 1 second delay in returning a SHARING_VIOLATION error.
****************************************************************************/
static void defer_open(struct share_mode_lock *lck,
struct timeval request_time,
struct timeval timeout,
struct deferred_open_record *state)
{
uint16 mid = get_current_mid();
int i;
/* Paranoia check */
for (i=0; i<lck->num_share_modes; i++) {
struct share_mode_entry *e = &lck->share_modes[i];
if (!is_deferred_open_entry(e)) {
continue;
}
if (procid_is_me(&e->pid) && (e->op_mid == mid)) {
DEBUG(0, ("Trying to defer an already deferred "
"request: mid=%d, exiting\n", mid));
exit_server("attempt to defer a deferred request");
}
}
/* End paranoia check */
DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
"open entry for mid %u\n",
(unsigned int)request_time.tv_sec,
(unsigned int)request_time.tv_usec,
(unsigned int)mid));
if (!push_deferred_smb_message(mid, request_time, timeout,
(char *)state, sizeof(*state))) {
exit_server("push_deferred_smb_message failed");
}
add_deferred_open(lck, mid, request_time, state->dev, state->inode);
/*
* Push the MID of this packet on the signing queue.
* We only do this once, the first time we push the packet
* onto the deferred open queue, as this has a side effect
* of incrementing the response sequence number.
*/
srv_defer_sign_response(mid);
}
/****************************************************************************
Set a kernel flock on a file for NFS interoperability.
This requires a patch to Linux.
****************************************************************************/
static void kernel_flock(files_struct *fsp, uint32 share_mode)
{
#if HAVE_KERNEL_SHARE_MODES
int kernel_mode = 0;
if (share_mode == FILE_SHARE_WRITE) {
kernel_mode = LOCK_MAND|LOCK_WRITE;
} else if (share_mode == FILE_SHARE_READ) {
kernel_mode = LOCK_MAND|LOCK_READ;
} else if (share_mode == FILE_SHARE_NONE) {
kernel_mode = LOCK_MAND;
}
if (kernel_mode) {
flock(fsp->fh->fd, kernel_mode);
}
#endif
;
}
/****************************************************************************
On overwrite open ensure that the attributes match.
****************************************************************************/
static BOOL open_match_attributes(connection_struct *conn,
const char *path,
uint32 old_dos_attr,
uint32 new_dos_attr,
mode_t existing_unx_mode,
mode_t new_unx_mode,
mode_t *returned_unx_mode)
{
uint32 noarch_old_dos_attr, noarch_new_dos_attr;
noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
(noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
*returned_unx_mode = new_unx_mode;
} else {
*returned_unx_mode = (mode_t)0;
}
DEBUG(10,("open_match_attributes: file %s old_dos_attr = 0x%x, "
"existing_unx_mode = 0%o, new_dos_attr = 0x%x "
"returned_unx_mode = 0%o\n",
path,
(unsigned int)old_dos_attr,
(unsigned int)existing_unx_mode,
(unsigned int)new_dos_attr,
(unsigned int)*returned_unx_mode ));
/* If we're mapping SYSTEM and HIDDEN ensure they match. */
if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
!(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
return False;
}
}
if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
!(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
return False;
}
}
return True;
}
/****************************************************************************
Special FCB or DOS processing in the case of a sharing violation.
Try and find a duplicated file handle.
****************************************************************************/
static files_struct *fcb_or_dos_open(connection_struct *conn,
const char *fname, SMB_DEV_T dev,
SMB_INO_T inode,
uint32 access_mask,
uint32 share_access,
uint32 create_options)
{
files_struct *fsp;
files_struct *dup_fsp;
DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
"file %s.\n", fname ));
for(fsp = file_find_di_first(dev, inode); fsp;
fsp = file_find_di_next(fsp)) {
DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
"vuid = %u, file_pid = %u, private_options = 0x%x "
"access_mask = 0x%x\n", fsp->fsp_name,
fsp->fh->fd, (unsigned int)fsp->vuid,
(unsigned int)fsp->file_pid,
(unsigned int)fsp->fh->private_options,
(unsigned int)fsp->access_mask ));
if (fsp->fh->fd != -1 &&
fsp->vuid == current_user.vuid &&
fsp->file_pid == global_smbpid &&
(fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
(fsp->access_mask & FILE_WRITE_DATA) &&
strequal(fsp->fsp_name, fname)) {
DEBUG(10,("fcb_or_dos_open: file match\n"));
break;
}
}
if (!fsp) {
return NULL;
}
/* quite an insane set of semantics ... */
if (is_executable(fname) &&
(fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
return NULL;
}
/* We need to duplicate this fsp. */
if (!NT_STATUS_IS_OK(dup_file_fsp(fsp, access_mask, share_access,
create_options, &dup_fsp))) {
return NULL;
}
return dup_fsp;
}
/****************************************************************************
Open a file with a share mode - old openX method - map into NTCreate.
****************************************************************************/
BOOL map_open_params_to_ntcreate(const char *fname, int deny_mode, int open_func,
uint32 *paccess_mask,
uint32 *pshare_mode,
uint32 *pcreate_disposition,
uint32 *pcreate_options)
{
uint32 access_mask;
uint32 share_mode;
uint32 create_disposition;
uint32 create_options = 0;
DEBUG(10,("map_open_params_to_ntcreate: fname = %s, deny_mode = 0x%x, "
"open_func = 0x%x\n",
fname, (unsigned int)deny_mode, (unsigned int)open_func ));
/* Create the NT compatible access_mask. */
switch (GET_OPENX_MODE(deny_mode)) {
case DOS_OPEN_EXEC: /* Implies read-only - used to be FILE_READ_DATA */
case DOS_OPEN_RDONLY:
access_mask = FILE_GENERIC_READ;
break;
case DOS_OPEN_WRONLY:
access_mask = FILE_GENERIC_WRITE;
break;
case DOS_OPEN_RDWR:
case DOS_OPEN_FCB:
access_mask = FILE_GENERIC_READ|FILE_GENERIC_WRITE;
break;
default:
DEBUG(10,("map_open_params_to_ntcreate: bad open mode = 0x%x\n",
(unsigned int)GET_OPENX_MODE(deny_mode)));
return False;
}
/* Create the NT compatible create_disposition. */
switch (open_func) {
case OPENX_FILE_EXISTS_FAIL|OPENX_FILE_CREATE_IF_NOT_EXIST:
create_disposition = FILE_CREATE;
break;
case OPENX_FILE_EXISTS_OPEN:
create_disposition = FILE_OPEN;
break;
case OPENX_FILE_EXISTS_OPEN|OPENX_FILE_CREATE_IF_NOT_EXIST:
create_disposition = FILE_OPEN_IF;
break;
case OPENX_FILE_EXISTS_TRUNCATE:
create_disposition = FILE_OVERWRITE;
break;
case OPENX_FILE_EXISTS_TRUNCATE|OPENX_FILE_CREATE_IF_NOT_EXIST:
create_disposition = FILE_OVERWRITE_IF;
break;
default:
/* From samba4 - to be confirmed. */
if (GET_OPENX_MODE(deny_mode) == DOS_OPEN_EXEC) {
create_disposition = FILE_CREATE;
break;
}
DEBUG(10,("map_open_params_to_ntcreate: bad "
"open_func 0x%x\n", (unsigned int)open_func));
return False;
}
/* Create the NT compatible share modes. */
switch (GET_DENY_MODE(deny_mode)) {
case DENY_ALL:
share_mode = FILE_SHARE_NONE;
break;
case DENY_WRITE:
share_mode = FILE_SHARE_READ;
break;
case DENY_READ:
share_mode = FILE_SHARE_WRITE;
break;
case DENY_NONE:
share_mode = FILE_SHARE_READ|FILE_SHARE_WRITE;
break;
case DENY_DOS:
create_options |= NTCREATEX_OPTIONS_PRIVATE_DENY_DOS;
if (is_executable(fname)) {
share_mode = FILE_SHARE_READ|FILE_SHARE_WRITE;
} else {
if (GET_OPENX_MODE(deny_mode) == DOS_OPEN_RDONLY) {
share_mode = FILE_SHARE_READ;
} else {
share_mode = FILE_SHARE_NONE;
}
}
break;
case DENY_FCB:
create_options |= NTCREATEX_OPTIONS_PRIVATE_DENY_FCB;
share_mode = FILE_SHARE_NONE;
break;
default:
DEBUG(10,("map_open_params_to_ntcreate: bad deny_mode 0x%x\n",
(unsigned int)GET_DENY_MODE(deny_mode) ));
return False;
}
DEBUG(10,("map_open_params_to_ntcreate: file %s, access_mask = 0x%x, "
"share_mode = 0x%x, create_disposition = 0x%x, "
"create_options = 0x%x\n",
fname,
(unsigned int)access_mask,
(unsigned int)share_mode,
(unsigned int)create_disposition,
(unsigned int)create_options ));
if (paccess_mask) {
*paccess_mask = access_mask;
}
if (pshare_mode) {
*pshare_mode = share_mode;
}
if (pcreate_disposition) {
*pcreate_disposition = create_disposition;
}
if (pcreate_options) {
*pcreate_options = create_options;
}
return True;
}
static void schedule_defer_open(struct share_mode_lock *lck, struct timeval request_time)
{
struct deferred_open_record state;
/* This is a relative time, added to the absolute
request_time value to get the absolute timeout time.
Note that if this is the second or greater time we enter
this codepath for this particular request mid then
request_time is left as the absolute time of the *first*
time this request mid was processed. This is what allows
the request to eventually time out. */
struct timeval timeout;
/* Normally the smbd we asked should respond within
* OPLOCK_BREAK_TIMEOUT seconds regardless of whether
* the client did, give twice the timeout as a safety
* measure here in case the other smbd is stuck
* somewhere else. */
timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
/* Nothing actually uses state.delayed_for_oplocks
but it's handy to differentiate in debug messages
between a 30 second delay due to oplock break, and
a 1 second delay for share mode conflicts. */
state.delayed_for_oplocks = True;
state.dev = lck->dev;
state.inode = lck->ino;
if (!request_timed_out(request_time, timeout)) {
defer_open(lck, request_time, timeout, &state);
}
}
/****************************************************************************
Open a file with a share mode.
****************************************************************************/
NTSTATUS open_file_ntcreate(connection_struct *conn,
const char *fname,
SMB_STRUCT_STAT *psbuf,
uint32 access_mask, /* access bits (FILE_READ_DATA etc.) */
uint32 share_access, /* share constants (FILE_SHARE_READ etc) */
uint32 create_disposition, /* FILE_OPEN_IF etc. */
uint32 create_options, /* options such as delete on close. */
uint32 new_dos_attributes, /* attributes used for new file. */
int oplock_request, /* internal Samba oplock codes. */
/* Information (FILE_EXISTS etc.) */
int *pinfo,
files_struct **result)
{
int flags=0;
int flags2=0;
BOOL file_existed = VALID_STAT(*psbuf);
BOOL def_acl = False;
SMB_DEV_T dev = 0;
SMB_INO_T inode = 0;
NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
files_struct *fsp = NULL;
mode_t new_unx_mode = (mode_t)0;
mode_t unx_mode = (mode_t)0;
int info;
uint32 existing_dos_attributes = 0;
struct pending_message_list *pml = NULL;
uint16 mid = get_current_mid();
struct timeval request_time = timeval_zero();
struct share_mode_lock *lck = NULL;
uint32 open_access_mask = access_mask;
NTSTATUS status;
if (conn->printer) {
/*
* Printers are handled completely differently.
* Most of the passed parameters are ignored.
*/
if (pinfo) {
*pinfo = FILE_WAS_CREATED;
}
DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n", fname));
return print_fsp_open(conn, fname, &fsp);
}
/* We add aARCH to this as this mode is only used if the file is
* created new. */
unx_mode = unix_mode(conn, new_dos_attributes | aARCH,fname, True);
DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
"access_mask=0x%x share_access=0x%x "
"create_disposition = 0x%x create_options=0x%x "
"unix mode=0%o oplock_request=%d\n",
fname, new_dos_attributes, access_mask, share_access,
create_disposition, create_options, unx_mode,
oplock_request));
if ((pml = get_open_deferred_message(mid)) != NULL) {
struct deferred_open_record *state =
(struct deferred_open_record *)pml->private_data.data;
/* Remember the absolute time of the original
request with this mid. We'll use it later to
see if this has timed out. */
request_time = pml->request_time;
/* Remove the deferred open entry under lock. */
lck = get_share_mode_lock(NULL, state->dev, state->inode, NULL, NULL);
if (lck == NULL) {
DEBUG(0, ("could not get share mode lock\n"));
} else {
del_deferred_open_entry(lck, mid);
TALLOC_FREE(lck);
}
/* Ensure we don't reprocess this message. */
remove_deferred_open_smb_message(mid);
}
if (!check_name(fname,conn)) {
return map_nt_error_from_unix(errno);
}
new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
if (file_existed) {
existing_dos_attributes = dos_mode(conn, fname, psbuf);
}
/* ignore any oplock requests if oplocks are disabled */
if (!lp_oplocks(SNUM(conn)) || global_client_failed_oplock_break ||
IS_VETO_OPLOCK_PATH(conn, fname)) {
/* Mask off everything except the private Samba bits. */
oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
}
/* this is for OS/2 long file names - say we don't support them */
if (!lp_posix_pathnames() && strstr(fname,".+,;=[].")) {
/* OS/2 Workplace shell fix may be main code stream in a later
* release. */
DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
"supported.\n"));
if (use_nt_status()) {
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
}
switch( create_disposition ) {
/*
* Currently we're using FILE_SUPERSEDE as the same as
* FILE_OVERWRITE_IF but they really are
* different. FILE_SUPERSEDE deletes an existing file
* (requiring delete access) then recreates it.
*/
case FILE_SUPERSEDE:
/* If file exists replace/overwrite. If file doesn't
* exist create. */
flags2 |= (O_CREAT | O_TRUNC);
break;
case FILE_OVERWRITE_IF:
/* If file exists replace/overwrite. If file doesn't
* exist create. */
flags2 |= (O_CREAT | O_TRUNC);
break;
case FILE_OPEN:
/* If file exists open. If file doesn't exist error. */
if (!file_existed) {
DEBUG(5,("open_file_ntcreate: FILE_OPEN "
"requested for file %s and file "
"doesn't exist.\n", fname ));
errno = ENOENT;
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
break;
case FILE_OVERWRITE:
/* If file exists overwrite. If file doesn't exist
* error. */
if (!file_existed) {
DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
"requested for file %s and file "
"doesn't exist.\n", fname ));
errno = ENOENT;
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
flags2 |= O_TRUNC;
break;
case FILE_CREATE:
/* If file exists error. If file doesn't exist
* create. */
if (file_existed) {
DEBUG(5,("open_file_ntcreate: FILE_CREATE "
"requested for file %s and file "
"already exists.\n", fname ));
if (S_ISDIR(psbuf->st_mode)) {
errno = EISDIR;
} else {
errno = EEXIST;
}
return map_nt_error_from_unix(errno);
}
flags2 |= (O_CREAT|O_EXCL);
break;
case FILE_OPEN_IF:
/* If file exists open. If file doesn't exist
* create. */
flags2 |= O_CREAT;
break;
default:
return NT_STATUS_INVALID_PARAMETER;
}
/* We only care about matching attributes on file exists and
* overwrite. */
if (file_existed && ((create_disposition == FILE_OVERWRITE) ||
(create_disposition == FILE_OVERWRITE_IF))) {
if (!open_match_attributes(conn, fname,
existing_dos_attributes,
new_dos_attributes, psbuf->st_mode,
unx_mode, &new_unx_mode)) {
DEBUG(5,("open_file_ntcreate: attributes missmatch "
"for file %s (%x %x) (0%o, 0%o)\n",
fname, existing_dos_attributes,
new_dos_attributes,
(unsigned int)psbuf->st_mode,
(unsigned int)unx_mode ));
errno = EACCES;
return NT_STATUS_ACCESS_DENIED;
}
}
/* This is a nasty hack - must fix... JRA. */
if (access_mask == MAXIMUM_ALLOWED_ACCESS) {
open_access_mask = access_mask = FILE_GENERIC_ALL;
}
/*
* Convert GENERIC bits to specific bits.
*/
se_map_generic(&access_mask, &file_generic_mapping);
open_access_mask = access_mask;
if (flags2 & O_TRUNC) {
open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
}
DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
"access_mask=0x%x\n", fname, access_mask ));
/*
* Note that we ignore the append flag as append does not
* mean the same thing under DOS and Unix.
*/
if (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) {
flags = O_RDWR;
} else {
flags = O_RDONLY;
}
/*
* Currently we only look at FILE_WRITE_THROUGH for create options.
*/
#if defined(O_SYNC)
if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
flags2 |= O_SYNC;
}
#endif /* O_SYNC */
if (!CAN_WRITE(conn)) {
/*
* We should really return a permission denied error if either
* O_CREAT or O_TRUNC are set, but for compatibility with
* older versions of Samba we just AND them out.
*/
flags2 &= ~(O_CREAT|O_TRUNC);
}
/*
* Ensure we can't write on a read-only share or file.
*/
if (flags != O_RDONLY && file_existed &&
(!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
DEBUG(5,("open_file_ntcreate: write access requested for "
"file %s on read only %s\n",
fname, !CAN_WRITE(conn) ? "share" : "file" ));
errno = EACCES;
return NT_STATUS_ACCESS_DENIED;
}
status = file_new(conn, &fsp);
if(!NT_STATUS_IS_OK(status)) {
return status;
}
fsp->dev = psbuf->st_dev;
fsp->inode = psbuf->st_ino;
fsp->share_access = share_access;
fsp->fh->private_options = create_options;
fsp->access_mask = open_access_mask; /* We change this to the
* requested access_mask after
* the open is done. */
/* Ensure no SAMBA_PRIVATE bits can be set. */
fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
if (timeval_is_zero(&request_time)) {
request_time = fsp->open_time;
}
if (file_existed) {
dev = psbuf->st_dev;
inode = psbuf->st_ino;
lck = get_share_mode_lock(NULL, dev, inode,
conn->connectpath,
fname);
if (lck == NULL) {
file_free(fsp);
DEBUG(0, ("Could not get share mode lock\n"));
return NT_STATUS_SHARING_VIOLATION;
}
/* First pass - send break only on batch oplocks. */
if (delay_for_oplocks(lck, fsp, 1, oplock_request)) {
schedule_defer_open(lck, request_time);
TALLOC_FREE(lck);
file_free(fsp);
return NT_STATUS_SHARING_VIOLATION;
}
/* Use the client requested access mask here, not the one we
* open with. */
status = open_mode_check(conn, fname, lck,
access_mask, share_access,
create_options, &file_existed);
if (NT_STATUS_IS_OK(status)) {
/* We might be going to allow this open. Check oplock
* status again. */
/* Second pass - send break for both batch or
* exclusive oplocks. */
if (delay_for_oplocks(lck, fsp, 2, oplock_request)) {
schedule_defer_open(lck, request_time);
TALLOC_FREE(lck);
file_free(fsp);
return NT_STATUS_SHARING_VIOLATION;
}
}
if (NT_STATUS_EQUAL(status, NT_STATUS_DELETE_PENDING)) {
/* DELETE_PENDING is not deferred for a second */
TALLOC_FREE(lck);
file_free(fsp);
return status;
}
if (!NT_STATUS_IS_OK(status)) {
uint32 can_access_mask;
BOOL can_access = True;
SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
/* Check if this can be done with the deny_dos and fcb
* calls. */
if (create_options &
(NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
files_struct *fsp_dup;
/* Use the client requested access mask here,
* not the one we open with. */
fsp_dup = fcb_or_dos_open(conn, fname, dev,
inode, access_mask,
share_access,
create_options);
if (fsp_dup) {
TALLOC_FREE(lck);
file_free(fsp);
if (pinfo) {
*pinfo = FILE_WAS_OPENED;
}
conn->num_files_open++;
*result = fsp_dup;
return NT_STATUS_OK;
}
}
/*
* This next line is a subtlety we need for
* MS-Access. If a file open will fail due to share
* permissions and also for security (access) reasons,
* we need to return the access failed error, not the
* share error. We can't open the file due to kernel
* oplock deadlock (it's possible we failed above on
* the open_mode_check()) so use a userspace check.
*/
if (flags & O_RDWR) {
can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
} else {
can_access_mask = FILE_READ_DATA;
}
if (((flags & O_RDWR) && !CAN_WRITE(conn)) ||
!can_access_file(conn,fname,psbuf,can_access_mask)) {
can_access = False;
}
/*
* If we're returning a share violation, ensure we
* cope with the braindead 1 second delay.
*/
if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
lp_defer_sharing_violations()) {
struct timeval timeout;
struct deferred_open_record state;
int timeout_usecs;
/* this is a hack to speed up torture tests
in 'make test' */
timeout_usecs = lp_parm_int(SNUM(conn),
"smbd","sharedelay",
SHARING_VIOLATION_USEC_WAIT);
/* This is a relative time, added to the absolute
request_time value to get the absolute timeout time.
Note that if this is the second or greater time we enter
this codepath for this particular request mid then
request_time is left as the absolute time of the *first*
time this request mid was processed. This is what allows
the request to eventually time out. */
timeout = timeval_set(0, timeout_usecs);
/* Nothing actually uses state.delayed_for_oplocks
but it's handy to differentiate in debug messages
between a 30 second delay due to oplock break, and
a 1 second delay for share mode conflicts. */
state.delayed_for_oplocks = False;
state.dev = dev;
state.inode = inode;
if (!request_timed_out(request_time,
timeout)) {
defer_open(lck, request_time, timeout,
&state);
}
}
TALLOC_FREE(lck);
if (can_access) {
/*
* We have detected a sharing violation here
* so return the correct error code
*/
status = NT_STATUS_SHARING_VIOLATION;
} else {
status = NT_STATUS_ACCESS_DENIED;
}
file_free(fsp);
return status;
}
/*
* We exit this block with the share entry *locked*.....
*/
}
SMB_ASSERT(!file_existed || (lck != NULL));
/*
* Ensure we pay attention to default ACLs on directories if required.
*/
if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
(def_acl = directory_has_default_acl(conn,
parent_dirname(fname)))) {
unx_mode = 0777;
}
DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
"access_mask = 0x%x, open_access_mask = 0x%x\n",
(unsigned int)flags, (unsigned int)flags2,
(unsigned int)unx_mode, (unsigned int)access_mask,
(unsigned int)open_access_mask));
/*
* open_file strips any O_TRUNC flags itself.
*/
fsp_open = open_file(fsp,conn,fname,psbuf,flags|flags2,unx_mode,
access_mask, open_access_mask);
if (!NT_STATUS_IS_OK(fsp_open)) {
if (lck != NULL) {
TALLOC_FREE(lck);
}
file_free(fsp);
return fsp_open;
}
if (!file_existed) {
/*
* Deal with the race condition where two smbd's detect the
* file doesn't exist and do the create at the same time. One
* of them will win and set a share mode, the other (ie. this
* one) should check if the requested share mode for this
* create is allowed.
*/
/*
* Now the file exists and fsp is successfully opened,
* fsp->dev and fsp->inode are valid and should replace the
* dev=0,inode=0 from a non existent file. Spotted by
* Nadav Danieli <nadavd@exanet.com>. JRA.
*/
dev = fsp->dev;
inode = fsp->inode;
lck = get_share_mode_lock(NULL, dev, inode,
conn->connectpath,
fname);
if (lck == NULL) {
DEBUG(0, ("open_file_ntcreate: Could not get share "
"mode lock for %s\n", fname));
fd_close(conn, fsp);
file_free(fsp);
return NT_STATUS_SHARING_VIOLATION;
}
status = open_mode_check(conn, fname, lck,
access_mask, share_access,
create_options, &file_existed);
if (!NT_STATUS_IS_OK(status)) {
struct deferred_open_record state;
fd_close(conn, fsp);
file_free(fsp);
state.delayed_for_oplocks = False;
state.dev = dev;
state.inode = inode;
/* Do it all over again immediately. In the second
* round we will find that the file existed and handle
* the DELETE_PENDING and FCB cases correctly. No need
* to duplicate the code here. Essentially this is a
* "goto top of this function", but don't tell
* anybody... */
defer_open(lck, request_time, timeval_zero(),
&state);
TALLOC_FREE(lck);
return status;
}
/*
* We exit this block with the share entry *locked*.....
*/
}
SMB_ASSERT(lck != NULL);
/* note that we ignore failure for the following. It is
basically a hack for NFS, and NFS will never set one of
these only read them. Nobody but Samba can ever set a deny
mode and we have already checked our more authoritative
locking database for permission to set this deny mode. If
the kernel refuses the operations then the kernel is wrong */
kernel_flock(fsp, share_access);
/*
* At this point onwards, we can guarentee that the share entry
* is locked, whether we created the file or not, and that the
* deny mode is compatible with all current opens.
*/
/*
* If requested, truncate the file.
*/
if (flags2&O_TRUNC) {
/*
* We are modifing the file after open - update the stat
* struct..
*/
if ((SMB_VFS_FTRUNCATE(fsp,fsp->fh->fd,0) == -1) ||
(SMB_VFS_FSTAT(fsp,fsp->fh->fd,psbuf)==-1)) {
status = map_nt_error_from_unix(errno);
TALLOC_FREE(lck);
fd_close(conn,fsp);
file_free(fsp);
return status;
}
}
/* Record the options we were opened with. */
fsp->share_access = share_access;
fsp->fh->private_options = create_options;
fsp->access_mask = access_mask;
if (file_existed) {
/* stat opens on existing files don't get oplocks. */
if (is_stat_open(open_access_mask)) {
fsp->oplock_type = NO_OPLOCK;
}
if (!(flags2 & O_TRUNC)) {
info = FILE_WAS_OPENED;
} else {
info = FILE_WAS_OVERWRITTEN;
}
} else {
info = FILE_WAS_CREATED;
/* Change the owner if required. */
if (lp_inherit_owner(SNUM(conn))) {
change_owner_to_parent(conn, fsp, fsp->fsp_name,
psbuf);
}
}
if (pinfo) {
*pinfo = info;
}
/*
* Setup the oplock info in both the shared memory and
* file structs.
*/
if ((fsp->oplock_type != NO_OPLOCK) &&
(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
if (!set_file_oplock(fsp, fsp->oplock_type)) {
/* Could not get the kernel oplock */
fsp->oplock_type = NO_OPLOCK;
}
}
set_share_mode(lck, fsp, current_user.ut.uid, 0, fsp->oplock_type);
if (info == FILE_WAS_OVERWRITTEN || info == FILE_WAS_CREATED ||
info == FILE_WAS_SUPERSEDED) {
/* Handle strange delete on close create semantics. */
if (create_options & FILE_DELETE_ON_CLOSE) {
status = can_set_delete_on_close(fsp, True, new_dos_attributes);
if (!NT_STATUS_IS_OK(status)) {
/* Remember to delete the mode we just added. */
del_share_mode(lck, fsp);
TALLOC_FREE(lck);
fd_close(conn,fsp);
file_free(fsp);
return status;
}
/* Note that here we set the *inital* delete on close flag,
not the regular one. */
set_delete_on_close_token(lck, &current_user.ut);
lck->initial_delete_on_close = True;
lck->modified = True;
}
/* Files should be initially set as archive */
if (lp_map_archive(SNUM(conn)) ||
lp_store_dos_attributes(SNUM(conn))) {
file_set_dosmode(conn, fname,
new_dos_attributes | aARCH, NULL,
True);
}
}
/*
* Take care of inherited ACLs on created files - if default ACL not
* selected.
*/
if (!file_existed && !def_acl) {
int saved_errno = errno; /* We might get ENOSYS in the next
* call.. */
if (SMB_VFS_FCHMOD_ACL(fsp, fsp->fh->fd, unx_mode) == -1 &&
errno == ENOSYS) {
errno = saved_errno; /* Ignore ENOSYS */
}
} else if (new_unx_mode) {
int ret = -1;
/* Attributes need changing. File already existed. */
{
int saved_errno = errno; /* We might get ENOSYS in the
* next call.. */
ret = SMB_VFS_FCHMOD_ACL(fsp, fsp->fh->fd,
new_unx_mode);
if (ret == -1 && errno == ENOSYS) {
errno = saved_errno; /* Ignore ENOSYS */
} else {
DEBUG(5, ("open_file_ntcreate: reset "
"attributes of file %s to 0%o\n",
fname, (unsigned int)new_unx_mode));
ret = 0; /* Don't do the fchmod below. */
}
}
if ((ret == -1) &&
(SMB_VFS_FCHMOD(fsp, fsp->fh->fd, new_unx_mode) == -1))
DEBUG(5, ("open_file_ntcreate: failed to reset "
"attributes of file %s to 0%o\n",
fname, (unsigned int)new_unx_mode));
}
/* If this is a successful open, we must remove any deferred open
* records. */
del_deferred_open_entry(lck, mid);
TALLOC_FREE(lck);
conn->num_files_open++;
*result = fsp;
return NT_STATUS_OK;
}
/****************************************************************************
Open a file for for write to ensure that we can fchmod it.
****************************************************************************/
NTSTATUS open_file_fchmod(connection_struct *conn, const char *fname,
SMB_STRUCT_STAT *psbuf, files_struct **result)
{
files_struct *fsp = NULL;
NTSTATUS status;
if (!VALID_STAT(*psbuf)) {
return NT_STATUS_INVALID_PARAMETER;
}
status = file_new(conn, &fsp);
if(!NT_STATUS_IS_OK(status)) {
return status;
}
/* note! we must use a non-zero desired access or we don't get
a real file descriptor. Oh what a twisted web we weave. */
status = open_file(fsp,conn,fname,psbuf,O_WRONLY,0,FILE_WRITE_DATA,FILE_WRITE_DATA);
/*
* This is not a user visible file open.
* Don't set a share mode and don't increment
* the conn->num_files_open.
*/
if (!NT_STATUS_IS_OK(status)) {
file_free(fsp);
return status;
}
*result = fsp;
return NT_STATUS_OK;
}
/****************************************************************************
Close the fchmod file fd - ensure no locks are lost.
****************************************************************************/
int close_file_fchmod(files_struct *fsp)
{
int ret = fd_close(fsp->conn, fsp);
file_free(fsp);
return ret;
}
/****************************************************************************
Open a directory from an NT SMB call.
****************************************************************************/
NTSTATUS open_directory(connection_struct *conn,
const char *fname,
SMB_STRUCT_STAT *psbuf,
uint32 access_mask,
uint32 share_access,
uint32 create_disposition,
uint32 create_options,
int *pinfo,
files_struct **result)
{
files_struct *fsp = NULL;
BOOL dir_existed = VALID_STAT(*psbuf) ? True : False;
BOOL create_dir = False;
struct share_mode_lock *lck = NULL;
NTSTATUS status;
int info = 0;
DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
"share_access = 0x%x create_options = 0x%x, "
"create_disposition = 0x%x\n",
fname,
(unsigned int)access_mask,
(unsigned int)share_access,
(unsigned int)create_options,
(unsigned int)create_disposition));
if (is_ntfs_stream_name(fname)) {
DEBUG(0,("open_directory: %s is a stream name!\n", fname ));
return NT_STATUS_NOT_A_DIRECTORY;
}
switch( create_disposition ) {
case FILE_OPEN:
/* If directory exists open. If directory doesn't
* exist error. */
if (!dir_existed) {
DEBUG(5,("open_directory: FILE_OPEN requested "
"for directory %s and it doesn't "
"exist.\n", fname ));
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
info = FILE_WAS_OPENED;
break;
case FILE_CREATE:
/* If directory exists error. If directory doesn't
* exist create. */
if (dir_existed) {
DEBUG(5,("open_directory: FILE_CREATE "
"requested for directory %s and it "
"already exists.\n", fname ));
if (use_nt_status()) {
return NT_STATUS_OBJECT_NAME_COLLISION;
} else {
return NT_STATUS_DOS(ERRDOS,
ERRfilexists);
}
}
create_dir = True;
info = FILE_WAS_CREATED;
break;
case FILE_OPEN_IF:
/* If directory exists open. If directory doesn't
* exist create. */
if (!dir_existed) {
create_dir = True;
info = FILE_WAS_CREATED;
} else {
info = FILE_WAS_OPENED;
}
break;
case FILE_SUPERSEDE:
case FILE_OVERWRITE:
case FILE_OVERWRITE_IF:
default:
DEBUG(5,("open_directory: invalid create_disposition "
"0x%x for directory %s\n",
(unsigned int)create_disposition, fname));
return NT_STATUS_INVALID_PARAMETER;
}
if (create_dir) {
/*
* Try and create the directory.
*/
/* We know bad_path is false as it's caught earlier. */
status = mkdir_internal(conn, fname, False);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(2,("open_directory: unable to create %s. "
"Error was %s\n", fname, strerror(errno) ));
/* Ensure we return the correct NT status to the
* client. */
return status;
}
/* Ensure we're checking for a symlink here.... */
/* We don't want to get caught by a symlink racer. */
if(SMB_VFS_LSTAT(conn,fname, psbuf) != 0) {
return map_nt_error_from_unix(errno);
}
if(!S_ISDIR(psbuf->st_mode)) {
DEBUG(0,("open_directory: %s is not a directory !\n",
fname ));
return NT_STATUS_NOT_A_DIRECTORY;
}
}
status = file_new(conn, &fsp);
if(!NT_STATUS_IS_OK(status)) {
return status;
}
/*
* Setup the files_struct for it.
*/
fsp->mode = psbuf->st_mode;
fsp->inode = psbuf->st_ino;
fsp->dev = psbuf->st_dev;
fsp->vuid = current_user.vuid;
fsp->file_pid = global_smbpid;
fsp->can_lock = False;
fsp->can_read = False;
fsp->can_write = False;
fsp->share_access = share_access;
fsp->fh->private_options = create_options;
fsp->access_mask = access_mask;
fsp->print_file = False;
fsp->modified = False;
fsp->oplock_type = NO_OPLOCK;
fsp->sent_oplock_break = NO_BREAK_SENT;
fsp->is_directory = True;
fsp->is_stat = False;
string_set(&fsp->fsp_name,fname);
lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode,
conn->connectpath,
fname);
if (lck == NULL) {
DEBUG(0, ("open_directory: Could not get share mode lock for %s\n", fname));
file_free(fsp);
return NT_STATUS_SHARING_VIOLATION;
}
status = open_mode_check(conn, fname, lck,
access_mask, share_access,
create_options, &dir_existed);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(lck);
file_free(fsp);
return status;
}
set_share_mode(lck, fsp, current_user.ut.uid, 0, NO_OPLOCK);
/* For directories the delete on close bit at open time seems
always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
if (create_options & FILE_DELETE_ON_CLOSE) {
status = can_set_delete_on_close(fsp, True, 0);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(lck);
file_free(fsp);
return status;
}
set_delete_on_close_token(lck, &current_user.ut);
lck->initial_delete_on_close = True;
lck->modified = True;
}
TALLOC_FREE(lck);
/* Change the owner if required. */
if ((info == FILE_WAS_CREATED) && lp_inherit_owner(SNUM(conn))) {
change_owner_to_parent(conn, fsp, fsp->fsp_name, psbuf);
}
if (pinfo) {
*pinfo = info;
}
conn->num_files_open++;
*result = fsp;
return NT_STATUS_OK;
}
/****************************************************************************
Open a pseudo-file (no locking checks - a 'stat' open).
****************************************************************************/
NTSTATUS open_file_stat(connection_struct *conn, char *fname,
SMB_STRUCT_STAT *psbuf, files_struct **result)
{
files_struct *fsp = NULL;
NTSTATUS status;
if (!VALID_STAT(*psbuf)) {
return NT_STATUS_INVALID_PARAMETER;
}
/* Can't 'stat' open directories. */
if(S_ISDIR(psbuf->st_mode)) {
return NT_STATUS_FILE_IS_A_DIRECTORY;
}
status = file_new(conn, &fsp);
if(!NT_STATUS_IS_OK(status)) {
return status;
}
DEBUG(5,("open_file_stat: 'opening' file %s\n", fname));
/*
* Setup the files_struct for it.
*/
fsp->mode = psbuf->st_mode;
fsp->inode = psbuf->st_ino;
fsp->dev = psbuf->st_dev;
fsp->vuid = current_user.vuid;
fsp->file_pid = global_smbpid;
fsp->can_lock = False;
fsp->can_read = False;
fsp->can_write = False;
fsp->print_file = False;
fsp->modified = False;
fsp->oplock_type = NO_OPLOCK;
fsp->sent_oplock_break = NO_BREAK_SENT;
fsp->is_directory = False;
fsp->is_stat = True;
string_set(&fsp->fsp_name,fname);
conn->num_files_open++;
*result = fsp;
return NT_STATUS_OK;
}
/****************************************************************************
Receive notification that one of our open files has been renamed by another
smbd process.
****************************************************************************/
void msg_file_was_renamed(int msg_type, struct process_id src, void *buf, size_t len)
{
files_struct *fsp;
char *frm = (char *)buf;
SMB_DEV_T dev;
SMB_INO_T inode;
const char *sharepath;
const char *newname;
size_t sp_len;
if (buf == NULL || len < MSG_FILE_RENAMED_MIN_SIZE + 2) {
DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n", (int)len));
return;
}
/* Unpack the message. */
dev = DEV_T_VAL(frm,0);
inode = INO_T_VAL(frm,8);
sharepath = &frm[16];
newname = sharepath + strlen(sharepath) + 1;
sp_len = strlen(sharepath);
DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
"dev %x, inode %.0f\n",
sharepath, newname, (unsigned int)dev, (double)inode ));
for(fsp = file_find_di_first(dev, inode); fsp; fsp = file_find_di_next(fsp)) {
if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
DEBUG(10,("msg_file_was_renamed: renaming file fnum %d from %s -> %s\n",
fsp->fnum, fsp->fsp_name, newname ));
string_set(&fsp->fsp_name, newname);
} else {
/* TODO. JRA. */
/* Now we have the complete path we can work out if this is
actually within this share and adjust newname accordingly. */
DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
"not sharepath %s) "
"fnum %d from %s -> %s\n",
fsp->conn->connectpath,
sharepath,
fsp->fnum,
fsp->fsp_name,
newname ));
}
}
}
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