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samba-mirror/source/smbd/open.c
Jeremy Allison 00f71fc836 More gentest error fixups. 
Jeremy.
0001-01-01 00:00:00 +00:00

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/*
Unix SMB/CIFS implementation.
file opening and share modes
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001
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 userdom_struct current_user_info;
extern uint16 global_oplock_port;
extern uint16 global_smbpid;
extern BOOL global_client_failed_oplock_break;
/****************************************************************************
fd support routines - attempt to do a dos_open.
****************************************************************************/
static int fd_open(struct connection_struct *conn, const char *fname,
int flags, mode_t mode)
{
int fd;
#ifdef O_NOFOLLOW
if (!lp_symlinks(SNUM(conn)))
flags |= O_NOFOLLOW;
#endif
fd = SMB_VFS_OPEN(conn,fname,flags,mode);
DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n", fname,
flags, (int)mode, fd, (fd == -1) ? strerror(errno) : "" ));
return fd;
}
/****************************************************************************
Close the file associated with a fsp.
****************************************************************************/
int fd_close(struct connection_struct *conn, files_struct *fsp)
{
if (fsp->fd == -1)
return 0; /* what we used to call a stat open. */
return fd_close_posix(conn, fsp);
}
/****************************************************************************
Check a filename for the pipe string.
****************************************************************************/
static void check_for_pipe(const char *fname)
{
/* special case of pipe opens */
char s[10];
StrnCpy(s,fname,sizeof(s)-1);
strlower_m(s);
if (strstr(s,"pipe/")) {
DEBUG(3,("Rejecting named pipe open for %s\n",fname));
unix_ERR_class = ERRSRV;
unix_ERR_code = ERRaccess;
unix_ERR_ntstatus = NT_STATUS_ACCESS_DENIED;
}
}
/****************************************************************************
Open a file.
****************************************************************************/
static BOOL open_file(files_struct *fsp,connection_struct *conn,
const char *fname,SMB_STRUCT_STAT *psbuf,int flags,mode_t mode, uint32 desired_access)
{
extern struct current_user current_user;
int accmode = (flags & O_ACCMODE);
int local_flags = flags;
fsp->fd = -1;
fsp->oplock_type = NO_OPLOCK;
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));
check_for_pipe(fname);
return False;
} 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 ((desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
(local_flags & O_CREAT) || ((local_flags & O_TRUNC) == O_TRUNC) ) {
/*
* We can't actually truncate here as the file may be locked.
* open_file_shared 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 (VALID_STAT(*psbuf) && S_ISFIFO(psbuf->st_mode))
local_flags |= O_NONBLOCK;
#endif
/* Don't create files with Microsoft wildcard characters. */
if ((local_flags & O_CREAT) && !VALID_STAT(*psbuf) && ms_has_wild(fname)) {
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRinvalidname;
unix_ERR_ntstatus = NT_STATUS_OBJECT_NAME_INVALID;
return False;
}
/* Actually do the open */
fsp->fd = fd_open(conn, fname, local_flags, mode);
if (fsp->fd == -1) {
DEBUG(3,("Error opening file %s (%s) (local_flags=%d) (flags=%d)\n",
fname,strerror(errno),local_flags,flags));
check_for_pipe(fname);
return False;
}
/* Inherit the ACL if the file was created. */
if ((local_flags & O_CREAT) && !VALID_STAT(*psbuf))
inherit_access_acl(conn, fname, mode);
} else
fsp->fd = -1; /* What we used to call a stat open. */
if (!VALID_STAT(*psbuf)) {
int ret;
if (fsp->fd == -1)
ret = SMB_VFS_STAT(conn, fname, psbuf);
else {
ret = SMB_VFS_FSTAT(fsp,fsp->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) {
fd_close(conn, fsp);
return False;
}
}
/*
* 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 False;
}
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->size = psbuf->st_size;
fsp->can_lock = True;
fsp->can_read = ((flags & O_WRONLY)==0);
fsp->can_write = ((flags & (O_WRONLY|O_RDWR))!=0);
fsp->share_mode = 0;
fsp->desired_access = desired_access;
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 = False;
fsp->directory_delete_on_close = False;
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));
return True;
}
/****************************************************************************
C. Hoch 11/22/95
Helper for open_file_shared.
Truncate a file after checking locking; close file if locked.
**************************************************************************/
static int truncate_unless_locked(struct connection_struct *conn, files_struct *fsp)
{
SMB_BIG_UINT mask = (SMB_BIG_UINT)-1;
if (is_locked(fsp,fsp->conn,mask,0,WRITE_LOCK,True)){
errno = EACCES;
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRlock;
unix_ERR_ntstatus = dos_to_ntstatus(ERRDOS, ERRlock);
return -1;
} else {
return SMB_VFS_FTRUNCATE(fsp,fsp->fd,0);
}
}
/*******************************************************************
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;
}
enum {AFAIL,AREAD,AWRITE,AALL};
/*******************************************************************
reproduce the share mode access table
this is horrendoously complex, and really can't be justified on any
rational grounds except that this is _exactly_ what NT does. See
the DENY1 and DENY2 tests in smbtorture for a comprehensive set of
test routines.
********************************************************************/
static int access_table(int new_deny,int old_deny,int old_mode,
BOOL same_pid, BOOL isexe)
{
if (new_deny == DENY_ALL || old_deny == DENY_ALL) return(AFAIL);
if (same_pid) {
if (isexe && old_mode == DOS_OPEN_RDONLY &&
old_deny == DENY_DOS && new_deny == DENY_READ) {
return AFAIL;
}
if (!isexe && old_mode == DOS_OPEN_RDONLY &&
old_deny == DENY_DOS && new_deny == DENY_DOS) {
return AREAD;
}
if (new_deny == DENY_FCB && old_deny == DENY_DOS) {
if (isexe) return AFAIL;
if (old_mode == DOS_OPEN_RDONLY) return AFAIL;
return AALL;
}
if (old_mode == DOS_OPEN_RDONLY && old_deny == DENY_DOS) {
if (new_deny == DENY_FCB || new_deny == DENY_READ) {
if (isexe) return AREAD;
return AFAIL;
}
}
if (old_deny == DENY_FCB) {
if (new_deny == DENY_DOS || new_deny == DENY_FCB) return AALL;
return AFAIL;
}
}
if (old_deny == DENY_DOS || new_deny == DENY_DOS ||
old_deny == DENY_FCB || new_deny == DENY_FCB) {
if (isexe) {
if (old_deny == DENY_FCB || new_deny == DENY_FCB) {
return AFAIL;
}
if (old_deny == DENY_DOS) {
if (new_deny == DENY_READ &&
(old_mode == DOS_OPEN_RDONLY ||
old_mode == DOS_OPEN_RDWR)) {
return AFAIL;
}
if (new_deny == DENY_WRITE &&
(old_mode == DOS_OPEN_WRONLY ||
old_mode == DOS_OPEN_RDWR)) {
return AFAIL;
}
return AALL;
}
if (old_deny == DENY_NONE) return AALL;
if (old_deny == DENY_READ) return AWRITE;
if (old_deny == DENY_WRITE) return AREAD;
}
/* it isn't a exe, dll, sym or com file */
if (old_deny == new_deny && same_pid)
return(AALL);
if (old_deny == DENY_READ || new_deny == DENY_READ) return AFAIL;
if (old_mode == DOS_OPEN_RDONLY) return(AREAD);
return(AFAIL);
}
switch (new_deny)
{
case DENY_WRITE:
if (old_deny==DENY_WRITE && old_mode==DOS_OPEN_RDONLY) return(AREAD);
if (old_deny==DENY_READ && old_mode==DOS_OPEN_RDONLY) return(AWRITE);
if (old_deny==DENY_NONE && old_mode==DOS_OPEN_RDONLY) return(AALL);
return(AFAIL);
case DENY_READ:
if (old_deny==DENY_WRITE && old_mode==DOS_OPEN_WRONLY) return(AREAD);
if (old_deny==DENY_READ && old_mode==DOS_OPEN_WRONLY) return(AWRITE);
if (old_deny==DENY_NONE && old_mode==DOS_OPEN_WRONLY) return(AALL);
return(AFAIL);
case DENY_NONE:
if (old_deny==DENY_WRITE) return(AREAD);
if (old_deny==DENY_READ) return(AWRITE);
if (old_deny==DENY_NONE) return(AALL);
return(AFAIL);
}
return(AFAIL);
}
/****************************************************************************
check if we can open a file with a share mode
****************************************************************************/
static BOOL check_share_mode(connection_struct *conn, share_mode_entry *share, int share_mode, uint32 desired_access,
const char *fname, BOOL fcbopen, int *flags)
{
int deny_mode = GET_DENY_MODE(share_mode);
int old_open_mode = GET_OPEN_MODE(share->share_mode);
int old_deny_mode = GET_DENY_MODE(share->share_mode);
/*
* share modes = false means don't bother to check for
* DENY mode conflict. This is a *really* bad idea :-). JRA.
*/
if(!lp_share_modes(SNUM(conn)))
return True;
/*
* Don't allow any opens once the delete on close flag has been
* set.
*/
if (GET_DELETE_ON_CLOSE_FLAG(share->share_mode)) {
DEBUG(5,("check_share_mode: Failing open on file %s as delete on close flag is set.\n",
fname ));
/* Use errno to map to correct error. */
unix_ERR_class = SMB_SUCCESS;
unix_ERR_code = 0;
unix_ERR_ntstatus = NT_STATUS_OK;
return False;
}
/* this is a nasty hack, but necessary until we rewrite our open
handling to use a NTCreateX call as the basic call.
NT may open a file with neither read nor write access, and in
this case it expects the open not to conflict with any
existing deny modes. This happens (for example) during a
"xcopy /o" where the second file descriptor is used for
ACL sets
(tridge)
*/
/*
* This is a bit wierd - the test for desired access not having the
* critical bits seems seems odd. Firstly, if both opens have no
* critical bits then always ignore. Then check the "allow delete"
* then check for either. This probably isn't quite right yet but
* gets us much closer. JRA.
*/
/*
* If desired_access doesn't contain READ_DATA,WRITE_DATA,APPEND_DATA or EXECUTE
* and the existing desired_acces then share modes don't conflict.
*/
if ( !(desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) &&
!(share->desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ) {
/*
* Wrinkle discovered by smbtorture....
* If both are non-io open and requester is asking for delete and current open has delete access
* but neither open has allowed file share delete then deny.... this is very strange and
* seems to be the only case in which non-io opens conflict. JRA.
*/
if ((desired_access & DELETE_ACCESS) && (share->desired_access & DELETE_ACCESS) &&
(!GET_ALLOW_SHARE_DELETE(share->share_mode) || !GET_ALLOW_SHARE_DELETE(share_mode))) {
DEBUG(5,("check_share_mode: Failing open on file %s as delete access requests conflict.\n",
fname ));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return False;
}
DEBUG(5,("check_share_mode: Allowing open on file %s as both desired access (0x%x) \
and existing desired access (0x%x) are non-data opens\n",
fname, (unsigned int)desired_access, (unsigned int)share->desired_access ));
return True;
}
/*
* If delete access was requested and the existing share mode doesn't have
* ALLOW_SHARE_DELETE then deny.
*/
if ((desired_access & DELETE_ACCESS) && !GET_ALLOW_SHARE_DELETE(share->share_mode)) {
DEBUG(5,("check_share_mode: Failing open on file %s as delete access requested and allow share delete not set.\n",
fname ));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return False;
}
/*
* The inverse of the above.
* If delete access was granted and the new share mode doesn't have
* ALLOW_SHARE_DELETE then deny.
*/
if ((share->desired_access & DELETE_ACCESS) && !GET_ALLOW_SHARE_DELETE(share_mode)) {
DEBUG(5,("check_share_mode: Failing open on file %s as delete access granted and allow share delete not requested.\n",
fname ));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return False;
}
/*
* If desired_access doesn't contain READ_DATA,WRITE_DATA,APPEND_DATA or EXECUTE
* then share modes don't conflict. Likewise with existing desired access.
*/
if ( !(desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
!(share->desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ) {
DEBUG(5,("check_share_mode: Allowing open on file %s as desired access (0x%x) doesn't conflict with\
existing desired access (0x%x).\n", fname, (unsigned int)desired_access, (unsigned int)share->desired_access ));
return True;
}
{
int access_allowed = access_table(deny_mode,old_deny_mode,old_open_mode,
(share->pid == sys_getpid()),is_executable(fname));
if ((access_allowed == AFAIL) ||
(!fcbopen && (access_allowed == AREAD && *flags == O_RDWR)) ||
(access_allowed == AREAD && *flags != O_RDONLY) ||
(access_allowed == AWRITE && *flags != O_WRONLY)) {
DEBUG(2,("Share violation on file (%d,%d,%d,%d,%s,fcbopen = %d, flags = %d) = %d\n",
deny_mode,old_deny_mode,old_open_mode,
(int)share->pid,fname, fcbopen, *flags, access_allowed));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return False;
}
if (access_allowed == AREAD)
*flags = O_RDONLY;
if (access_allowed == AWRITE)
*flags = O_WRONLY;
}
return True;
}
#if defined(DEVELOPER)
static void validate_my_share_entries(int num, share_mode_entry *share_entry)
{
files_struct *fsp;
if (share_entry->pid != sys_getpid())
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 (((uint16)fsp->oplock_type) != share_entry->op_type) {
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
/****************************************************************************
Deal with open deny mode and oplock break processing.
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 int open_mode_check(connection_struct *conn, const char *fname, SMB_DEV_T dev,
SMB_INO_T inode,
uint32 desired_access,
int share_mode, int *p_flags, int *p_oplock_request,
BOOL *p_all_current_opens_are_level_II)
{
int i;
int num_share_modes;
int oplock_contention_count = 0;
share_mode_entry *old_shares = 0;
BOOL fcbopen = False;
BOOL broke_oplock;
if(GET_OPEN_MODE(share_mode) == DOS_OPEN_FCB)
fcbopen = True;
num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
if(num_share_modes == 0)
return 0;
/*
* Check if the share modes will give us access.
*/
do {
share_mode_entry broken_entry;
broke_oplock = False;
*p_all_current_opens_are_level_II = True;
for(i = 0; i < num_share_modes; i++) {
share_mode_entry *share_entry = &old_shares[i];
#if defined(DEVELOPER)
validate_my_share_entries(i, share_entry);
#endif
/*
* By observation of NetBench, oplocks are broken *before* share
* modes are checked. This allows a file to be closed by the client
* if the share mode would deny access and the client has an oplock.
* Check if someone has an oplock on this file. If so we must break
* it before continuing.
*/
if((*p_oplock_request && EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) ||
(!*p_oplock_request && (share_entry->op_type != NO_OPLOCK))) {
BOOL opb_ret;
DEBUG(5,("open_mode_check: oplock_request = %d, breaking oplock (%x) on file %s, \
dev = %x, inode = %.0f\n", *p_oplock_request, share_entry->op_type, fname, (unsigned int)dev, (double)inode));
/* Ensure the reply for the open uses the correct sequence number. */
/* This isn't a real deferred packet as it's response will also increment
* the sequence.
*/
srv_defer_sign_response(get_current_mid());
/* Oplock break - unlock to request it. */
unlock_share_entry(conn, dev, inode);
opb_ret = request_oplock_break(share_entry, False);
/* Now relock. */
lock_share_entry(conn, dev, inode);
if(opb_ret == False) {
DEBUG(0,("open_mode_check: FAILED when breaking oplock (%x) on file %s, \
dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
SAFE_FREE(old_shares);
errno = EACCES;
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return -1;
}
broke_oplock = True;
broken_entry = *share_entry;
break;
} else if (!LEVEL_II_OPLOCK_TYPE(share_entry->op_type)) {
*p_all_current_opens_are_level_II = False;
}
/* someone else has a share lock on it, check to see if we can too */
if (!check_share_mode(conn, share_entry, share_mode, desired_access,
fname, fcbopen, p_flags)) {
SAFE_FREE(old_shares);
errno = EACCES;
return -1;
}
} /* end for */
if(broke_oplock) {
SAFE_FREE(old_shares);
num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
oplock_contention_count++;
/* Paranoia check that this is no longer an exlusive entry. */
for(i = 0; i < num_share_modes; i++) {
share_mode_entry *share_entry = &old_shares[i];
if (share_modes_identical(&broken_entry, share_entry) &&
EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type) ) {
/*
* This should not happen. The target left this oplock
* as exlusive.... The process *must* be dead....
*/
DEBUG(0,("open_mode_check: exlusive oplock left by process %d after break ! For file %s, \
dev = %x, inode = %.0f. Deleting it to continue...\n", (int)broken_entry.pid, fname, (unsigned int)dev, (double)inode));
if (process_exists(broken_entry.pid)) {
DEBUG(0,("open_mode_check: Existent process %lu left active oplock.\n",
(unsigned long)broken_entry.pid ));
}
if (del_share_entry(dev, inode, &broken_entry, NULL) == -1) {
errno = EACCES;
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRbadshare;
unix_ERR_ntstatus = NT_STATUS_SHARING_VIOLATION;
return -1;
}
/*
* We must reload the share modes after deleting the
* other process's entry.
*/
SAFE_FREE(old_shares);
num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
break;
}
} /* end for paranoia... */
} /* end if broke_oplock */
} while(broke_oplock);
if(old_shares != 0)
SAFE_FREE(old_shares);
/*
* Refuse to grant an oplock in case the contention limit is
* reached when going through the lock list multiple times.
*/
if(oplock_contention_count >= lp_oplock_contention_limit(SNUM(conn))) {
*p_oplock_request = 0;
DEBUG(4,("open_mode_check: oplock contention = %d. Not granting oplock.\n",
oplock_contention_count ));
}
return num_share_modes;
}
/****************************************************************************
set a kernel flock on a file for NFS interoperability
this requires a patch to Linux
****************************************************************************/
static void kernel_flock(files_struct *fsp, int deny_mode)
{
#if HAVE_KERNEL_SHARE_MODES
int kernel_mode = 0;
if (deny_mode == DENY_READ) kernel_mode = LOCK_MAND|LOCK_WRITE;
else if (deny_mode == DENY_WRITE) kernel_mode = LOCK_MAND|LOCK_READ;
else if (deny_mode == DENY_ALL) kernel_mode = LOCK_MAND;
if (kernel_mode) flock(fsp->fd, kernel_mode);
#endif
;;
}
static BOOL open_match_attributes(connection_struct *conn, char *path, mode_t existing_mode,
mode_t new_mode, mode_t *returned_mode)
{
uint32 old_dos_mode, new_dos_mode;
uint32 noarch_old_dos_mode, noarch_new_dos_mode;
SMB_STRUCT_STAT sbuf;
ZERO_STRUCT(sbuf);
sbuf.st_mode = existing_mode;
old_dos_mode = dos_mode(conn, path, &sbuf);
sbuf.st_mode = new_mode;
new_dos_mode = dos_mode(conn, path, &sbuf);
noarch_old_dos_mode = (old_dos_mode & ~FILE_ATTRIBUTE_ARCHIVE);
noarch_new_dos_mode = (new_dos_mode & ~FILE_ATTRIBUTE_ARCHIVE);
if((noarch_old_dos_mode == 0 && noarch_new_dos_mode != 0) ||
(noarch_old_dos_mode != 0 && ((noarch_old_dos_mode & noarch_new_dos_mode) == noarch_old_dos_mode)))
*returned_mode = new_mode;
else
*returned_mode = (mode_t)0;
DEBUG(10,("open_match_attributes: file %s old_dos_mode = 0x%x, existing_mode = 0%o, new_dos_mode = 0x%x returned_mode = 0%o\n",
path,
old_dos_mode, (unsigned int)existing_mode, new_dos_mode, (unsigned int)*returned_mode ));
/* If we're mapping SYSTEM and HIDDEN ensure they match. */
if (lp_map_system(SNUM(conn))) {
if ((old_dos_mode & FILE_ATTRIBUTE_SYSTEM) && !(new_dos_mode & FILE_ATTRIBUTE_SYSTEM))
return False;
}
if (lp_map_hidden(SNUM(conn))) {
if ((old_dos_mode & FILE_ATTRIBUTE_HIDDEN) && !(new_dos_mode & FILE_ATTRIBUTE_HIDDEN))
return False;
}
return True;
}
/****************************************************************************
Open a file with a share mode.
****************************************************************************/
files_struct *open_file_shared(connection_struct *conn,char *fname, SMB_STRUCT_STAT *psbuf,
int share_mode,int ofun, mode_t mode,int oplock_request,
int *Access,int *action)
{
return open_file_shared1(conn, fname, psbuf, 0, share_mode, ofun, mode,
oplock_request, Access, action);
}
/****************************************************************************
Open a file with a share mode.
****************************************************************************/
files_struct *open_file_shared1(connection_struct *conn,char *fname, SMB_STRUCT_STAT *psbuf,
uint32 desired_access,
int share_mode,int ofun, mode_t mode,int oplock_request,
int *Access,int *action)
{
int flags=0;
int flags2=0;
int deny_mode = GET_DENY_MODE(share_mode);
BOOL allow_share_delete = GET_ALLOW_SHARE_DELETE(share_mode);
BOOL delete_on_close = GET_DELETE_ON_CLOSE_FLAG(share_mode);
BOOL file_existed = VALID_STAT(*psbuf);
BOOL fcbopen = False;
BOOL def_acl = False;
SMB_DEV_T dev = 0;
SMB_INO_T inode = 0;
int num_share_modes = 0;
BOOL all_current_opens_are_level_II = False;
BOOL fsp_open = False;
files_struct *fsp = NULL;
int open_mode=0;
uint16 port = 0;
mode_t new_mode = (mode_t)0;
if (conn->printer) {
/* printers are handled completely differently. Most of the passed parameters are
ignored */
if (Access)
*Access = DOS_OPEN_WRONLY;
if (action)
*action = FILE_WAS_CREATED;
return print_fsp_open(conn, fname);
}
fsp = file_new(conn);
if(!fsp)
return NULL;
DEBUG(10,("open_file_shared: fname = %s, share_mode = %x, ofun = %x, mode = %o, oplock request = %d\n",
fname, share_mode, ofun, (int)mode, oplock_request ));
if (!check_name(fname,conn)) {
file_free(fsp);
return NULL;
}
/* ignore any oplock requests if oplocks are disabled */
if (!lp_oplocks(SNUM(conn)) || global_client_failed_oplock_break) {
oplock_request = 0;
}
/* this is for OS/2 EAs - try and say we don't support them */
if (strstr(fname,".+,;=[].")) {
unix_ERR_class = ERRDOS;
/* OS/2 Workplace shell fix may be main code stream in a later release. */
#if 1 /* OS2_WPS_FIX - Recent versions of OS/2 need this. */
unix_ERR_code = ERRcannotopen;
#else /* OS2_WPS_FIX */
unix_ERR_code = ERROR_EAS_NOT_SUPPORTED;
#endif /* OS2_WPS_FIX */
DEBUG(5,("open_file_shared: OS/2 EA's are not supported.\n"));
file_free(fsp);
return NULL;
}
if ((GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_FAIL) && file_existed) {
DEBUG(5,("open_file_shared: create new requested for file %s and file already exists.\n",
fname ));
file_free(fsp);
errno = EEXIST;
return NULL;
}
if (CAN_WRITE(conn) && (GET_FILE_CREATE_DISPOSITION(ofun) == FILE_CREATE_IF_NOT_EXIST))
flags2 |= O_CREAT;
if (CAN_WRITE(conn) && (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_TRUNCATE))
flags2 |= O_TRUNC;
/* We only care about matching attributes on file exists and truncate. */
if (file_existed && (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_TRUNCATE)) {
if (!open_match_attributes(conn, fname, psbuf->st_mode, mode, &new_mode)) {
DEBUG(5,("open_file_shared: attributes missmatch for file %s (0%o, 0%o)\n",
fname, (int)psbuf->st_mode, (int)mode ));
file_free(fsp);
errno = EACCES;
return NULL;
}
}
if (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_FAIL)
flags2 |= O_EXCL;
/* note that we ignore the append flag as
append does not mean the same thing under dos and unix */
switch (GET_OPEN_MODE(share_mode)) {
case DOS_OPEN_WRONLY:
flags = O_WRONLY;
if (desired_access == 0)
desired_access = FILE_WRITE_DATA;
break;
case DOS_OPEN_FCB:
fcbopen = True;
flags = O_RDWR;
if (desired_access == 0)
desired_access = FILE_READ_DATA|FILE_WRITE_DATA;
break;
case DOS_OPEN_RDWR:
flags = O_RDWR;
if (desired_access == 0)
desired_access = FILE_READ_DATA|FILE_WRITE_DATA;
break;
default:
flags = O_RDONLY;
if (desired_access == 0)
desired_access = FILE_READ_DATA;
break;
}
#if defined(O_SYNC)
if (GET_FILE_SYNC_OPENMODE(share_mode)) {
flags2 |= O_SYNC;
}
#endif /* O_SYNC */
if (flags != O_RDONLY && file_existed &&
(!CAN_WRITE(conn) || IS_DOS_READONLY(dos_mode(conn,fname,psbuf)))) {
if (!fcbopen) {
DEBUG(5,("open_file_shared: read/write access requested for file %s on read only %s\n",
fname, !CAN_WRITE(conn) ? "share" : "file" ));
file_free(fsp);
errno = EACCES;
return NULL;
}
flags = O_RDONLY;
}
if (deny_mode > DENY_NONE && deny_mode!=DENY_FCB) {
DEBUG(2,("Invalid deny mode %d on file %s\n",deny_mode,fname));
file_free(fsp);
errno = EINVAL;
return NULL;
}
if (file_existed) {
dev = psbuf->st_dev;
inode = psbuf->st_ino;
lock_share_entry(conn, dev, inode);
num_share_modes = open_mode_check(conn, fname, dev, inode,
desired_access,
share_mode,
&flags, &oplock_request, &all_current_opens_are_level_II);
if(num_share_modes == -1) {
/*
* 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. This means we must attempt to open the file anyway
* in order to get the UNIX access error - even if we're going to
* fail the open for share reasons. This is bad, as we're burning
* another fd if there are existing locks but there's nothing else
* we can do. We also ensure we're not going to create or tuncate
* the file as we only want an access decision at this stage. JRA.
*/
errno = 0;
fsp_open = open_file(fsp,conn,fname,psbuf,
flags|(flags2&~(O_TRUNC|O_CREAT)),mode,desired_access);
DEBUG(4,("open_file_shared : share_mode deny - calling open_file with \
flags=0x%X flags2=0x%X mode=0%o returned %d\n",
flags,(flags2&~(O_TRUNC|O_CREAT)),(int)mode,(int)fsp_open ));
if (!fsp_open && errno) {
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRnoaccess;
unix_ERR_ntstatus = NT_STATUS_ACCESS_DENIED;
}
unlock_share_entry(conn, dev, inode);
if (fsp_open)
fd_close(conn, fsp);
file_free(fsp);
return NULL;
}
/*
* We exit this block with the share entry *locked*.....
*/
}
/*
* 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))))
mode = 0777;
DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o\n",
flags,flags2,(int)mode));
/*
* open_file strips any O_TRUNC flags itself.
*/
fsp_open = open_file(fsp,conn,fname,psbuf,flags|flags2,mode,desired_access);
if (!fsp_open && (flags == O_RDWR) && (errno != ENOENT) && fcbopen) {
if((fsp_open = open_file(fsp,conn,fname,psbuf,O_RDONLY,mode,desired_access)) == True)
flags = O_RDONLY;
}
if (!fsp_open) {
if(file_existed)
unlock_share_entry(conn, dev, inode);
file_free(fsp);
return NULL;
}
/*
* 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.
*/
if (!file_existed) {
/*
* 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;
lock_share_entry_fsp(fsp);
num_share_modes = open_mode_check(conn, fname, dev, inode,
desired_access,
share_mode,
&flags, &oplock_request, &all_current_opens_are_level_II);
if(num_share_modes == -1) {
unlock_share_entry_fsp(fsp);
fd_close(conn,fsp);
file_free(fsp);
return NULL;
}
/*
* If there are any share modes set then the file *did*
* exist. Ensure we return the correct value for action.
*/
if (num_share_modes > 0)
file_existed = True;
/*
* We exit this block with the share entry *locked*.....
*/
}
/* 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, deny_mode);
/*
* 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 ((truncate_unless_locked(conn,fsp) == -1) || (SMB_VFS_FSTAT(fsp,fsp->fd,psbuf)==-1)) {
unlock_share_entry_fsp(fsp);
fd_close(conn,fsp);
file_free(fsp);
return NULL;
}
}
switch (flags) {
case O_RDONLY:
open_mode = DOS_OPEN_RDONLY;
break;
case O_RDWR:
open_mode = DOS_OPEN_RDWR;
break;
case O_WRONLY:
open_mode = DOS_OPEN_WRONLY;
break;
}
fsp->share_mode = SET_DENY_MODE(deny_mode) |
SET_OPEN_MODE(open_mode) |
SET_ALLOW_SHARE_DELETE(allow_share_delete);
DEBUG(10,("open_file_shared : share_mode = %x\n", fsp->share_mode ));
if (Access)
(*Access) = open_mode;
if (action) {
if (file_existed && !(flags2 & O_TRUNC))
*action = FILE_WAS_OPENED;
if (!file_existed)
*action = FILE_WAS_CREATED;
if (file_existed && (flags2 & O_TRUNC))
*action = FILE_WAS_OVERWRITTEN;
}
/*
* Setup the oplock info in both the shared memory and
* file structs.
*/
if(oplock_request && (num_share_modes == 0) &&
!IS_VETO_OPLOCK_PATH(conn,fname) && set_file_oplock(fsp, oplock_request) ) {
port = global_oplock_port;
} else if (oplock_request && all_current_opens_are_level_II) {
port = global_oplock_port;
oplock_request = LEVEL_II_OPLOCK;
set_file_oplock(fsp, oplock_request);
} else {
port = 0;
oplock_request = 0;
}
set_share_mode(fsp, port, oplock_request);
if (delete_on_close) {
NTSTATUS result = set_delete_on_close_internal(fsp, delete_on_close);
if (NT_STATUS_V(result) != NT_STATUS_V(NT_STATUS_OK)) {
/* Remember to delete the mode we just added. */
del_share_mode(fsp, NULL);
unlock_share_entry_fsp(fsp);
fd_close(conn,fsp);
file_free(fsp);
return NULL;
}
}
/*
* 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->fd, mode) == -1 && errno == ENOSYS)
errno = saved_errno; /* Ignore ENOSYS */
} else if (new_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->fd, new_mode);
if (ret == -1 && errno == ENOSYS) {
errno = saved_errno; /* Ignore ENOSYS */
} else {
DEBUG(5, ("open_file_shared: failed to reset attributes of file %s to 0%o\n",
fname, (int)new_mode));
ret = 0; /* Don't do the fchmod below. */
}
}
if ((ret == -1) && (SMB_VFS_FCHMOD(fsp, fsp->fd, new_mode) == -1))
DEBUG(5, ("open_file_shared: failed to reset attributes of file %s to 0%o\n",
fname, (int)new_mode));
}
unlock_share_entry_fsp(fsp);
conn->num_files_open++;
return fsp;
}
/****************************************************************************
Open a file for for write to ensure that we can fchmod it.
****************************************************************************/
files_struct *open_file_fchmod(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
{
files_struct *fsp = NULL;
BOOL fsp_open;
if (!VALID_STAT(*psbuf))
return NULL;
fsp = file_new(conn);
if(!fsp)
return NULL;
/* 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. */
fsp_open = open_file(fsp,conn,fname,psbuf,O_WRONLY,0,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 (!fsp_open) {
file_free(fsp);
return NULL;
}
return fsp;
}
/****************************************************************************
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.
****************************************************************************/
files_struct *open_directory(connection_struct *conn, char *fname, SMB_STRUCT_STAT *psbuf,
uint32 desired_access, int share_mode, int smb_ofun, mode_t unixmode, int *action)
{
extern struct current_user current_user;
BOOL got_stat = False;
files_struct *fsp = file_new(conn);
BOOL delete_on_close = GET_DELETE_ON_CLOSE_FLAG(share_mode);
if(!fsp)
return NULL;
if (VALID_STAT(*psbuf))
got_stat = True;
if (got_stat && (GET_FILE_OPEN_DISPOSITION(smb_ofun) == FILE_EXISTS_FAIL)) {
file_free(fsp);
errno = EEXIST; /* Setup so correct error is returned to client. */
return NULL;
}
if (GET_FILE_CREATE_DISPOSITION(smb_ofun) == FILE_CREATE_IF_NOT_EXIST) {
if (got_stat) {
if(!S_ISDIR(psbuf->st_mode)) {
DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
file_free(fsp);
errno = EACCES;
return NULL;
}
*action = FILE_WAS_OPENED;
} else {
/*
* Try and create the directory.
*/
if(!CAN_WRITE(conn)) {
DEBUG(2,("open_directory: failing create on read-only share\n"));
file_free(fsp);
errno = EACCES;
return NULL;
}
if (ms_has_wild(fname)) {
file_free(fsp);
DEBUG(5,("open_directory: failing create on filename %s with wildcards\n", fname));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRinvalidname;
unix_ERR_ntstatus = NT_STATUS_OBJECT_NAME_INVALID;
return NULL;
}
if( strchr_m(fname, ':')) {
file_free(fsp);
DEBUG(5,("open_directory: failing create on filename %s with colon in name\n", fname));
unix_ERR_class = ERRDOS;
unix_ERR_code = ERRinvalidname;
unix_ERR_ntstatus = NT_STATUS_NOT_A_DIRECTORY;
return NULL;
}
if(vfs_MkDir(conn,fname, unix_mode(conn,aDIR, fname)) < 0) {
DEBUG(2,("open_directory: unable to create %s. Error was %s\n",
fname, strerror(errno) ));
file_free(fsp);
return NULL;
}
if(SMB_VFS_STAT(conn,fname, psbuf) != 0) {
file_free(fsp);
return NULL;
}
*action = FILE_WAS_CREATED;
}
} else {
/*
* Don't create - just check that it *was* a directory.
*/
if(!got_stat) {
DEBUG(3,("open_directory: unable to stat name = %s. Error was %s\n",
fname, strerror(errno) ));
file_free(fsp);
return NULL;
}
if(!S_ISDIR(psbuf->st_mode)) {
DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
file_free(fsp);
return NULL;
}
*action = FILE_WAS_OPENED;
}
DEBUG(5,("open_directory: opening directory %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->size = psbuf->st_size;
fsp->vuid = current_user.vuid;
fsp->file_pid = global_smbpid;
fsp->can_lock = True;
fsp->can_read = False;
fsp->can_write = False;
fsp->share_mode = share_mode;
fsp->desired_access = desired_access;
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;
fsp->directory_delete_on_close = False;
string_set(&fsp->fsp_name,fname);
if (delete_on_close) {
NTSTATUS result = set_delete_on_close_internal(fsp, delete_on_close);
if (NT_STATUS_V(result) != NT_STATUS_V(NT_STATUS_OK)) {
file_free(fsp);
return NULL;
}
}
conn->num_files_open++;
return fsp;
}
/****************************************************************************
Open a pseudo-file (no locking checks - a 'stat' open).
****************************************************************************/
files_struct *open_file_stat(connection_struct *conn, char *fname, SMB_STRUCT_STAT *psbuf)
{
extern struct current_user current_user;
files_struct *fsp = NULL;
if (!VALID_STAT(*psbuf))
return NULL;
/* Can't 'stat' open directories. */
if(S_ISDIR(psbuf->st_mode))
return NULL;
fsp = file_new(conn);
if(!fsp)
return NULL;
DEBUG(5,("open_file_stat: 'opening' file %s\n", fname));
/*
* Setup the files_struct for it.
*/
fsp->mode = psbuf->st_mode;
/*
* Don't store dev or inode, we don't want any iterator
* to see this.
*/
fsp->inode = (SMB_INO_T)0;
fsp->dev = (SMB_DEV_T)0;
fsp->size = psbuf->st_size;
fsp->vuid = current_user.vuid;
fsp->file_pid = global_smbpid;
fsp->can_lock = False;
fsp->can_read = False;
fsp->can_write = False;
fsp->share_mode = 0;
fsp->desired_access = 0;
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;
fsp->directory_delete_on_close = False;
string_set(&fsp->fsp_name,fname);
conn->num_files_open++;
return fsp;
}
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