/* 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 BOOL global_client_failed_oplock_break; /**************************************************************************** fd support routines - attempt to do a dos_open. ****************************************************************************/ static int fd_open(struct connection_struct *conn, char *fname, int flags, mode_t mode) { int fd; #ifdef O_NOFOLLOW if (!lp_symlinks(SNUM(conn))) flags |= O_NOFOLLOW; #endif fd = conn->vfs_ops.open(conn,fname,flags,mode); /* Fix for files ending in '.' */ if((fd == -1) && (errno == ENOENT) && (strchr_m(fname,'.')==NULL)) { pstrcat(fname,"."); fd = conn->vfs_ops.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(char *fname) { /* special case of pipe opens */ char s[10]; StrnCpy(s,fname,sizeof(s)-1); strlower(s); if (strstr(s,"pipe/")) { DEBUG(3,("Rejecting named pipe open for %s\n",fname)); unix_ERR_class = ERRSRV; unix_ERR_code = ERRaccess; } } /**************************************************************************** Open a file. ****************************************************************************/ static BOOL open_file(files_struct *fsp,connection_struct *conn, char *fname1,SMB_STRUCT_STAT *psbuf,int flags,mode_t mode, uint32 desired_access) { extern struct current_user current_user; pstring fname; int accmode = (flags & O_ACCMODE); int local_flags = flags; fsp->fd = -1; fsp->oplock_type = NO_OPLOCK; errno = EPERM; pstrcpy(fname,fname1); /* 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; } } /* * 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)) local_flags = (flags & ~O_ACCMODE)|O_RDWR; /* * 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 ((desired_access & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) || (local_flags & O_CREAT)) { /* 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; } } else fsp->fd = -1; /* What we used to call a stat open. */ if (!VALID_STAT(*psbuf)) { int ret; if (fsp->fd == -1) ret = vfs_stat(conn, fname, psbuf); else { ret = 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->size = psbuf->st_size; fsp->pos = -1; 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->directory_delete_on_close = False; fsp->conn = conn; 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; return -1; } else { return conn->vfs_ops.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 )); unix_ERR_class = ERRDOS; unix_ERR_code = ERRnoaccess; 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; 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; 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; 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; return False; } if (access_allowed == AREAD) *flags = O_RDONLY; if (access_allowed == AWRITE) *flags = O_WRONLY; } return True; } /**************************************************************************** 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]; /* * 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)); /* Oplock break - unlock to request it. */ unlock_share_entry(conn, dev, inode); opb_ret = request_oplock_break(share_entry); /* 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; 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 %d left active oplock.\n", broken_entry.pid )); } if (del_share_entry(dev, inode, &broken_entry, NULL) == -1) { errno = EACCES; unix_ERR_class = ERRDOS; unix_ERR_code = ERRbadshare; 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 ;; } /**************************************************************************** Open a file with a share mode. On output from this open we are guarenteeing that ****************************************************************************/ 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. On output from this open we are guarenteeing that ****************************************************************************/ 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; 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; 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. */ 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 )); 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) { 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) || (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 && (conn->vfs_ops.fchmod_acl != NULL)) { int saved_errno = errno; /* We might get ENOSYS in the next call.. */ if (conn->vfs_ops.fchmod_acl(fsp, fsp->fd, mode) == -1 && errno == ENOSYS) errno = saved_errno; /* Ignore ENOSYS */ } 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; fsp->conn = conn; /* The vfs_fXXX() macros need this. */ 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(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(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(0,("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->pos = -1; 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->directory_delete_on_close = False; fsp->conn = conn; 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; } #if 0 Old code - I have replaced with correct desired_access checking. JRA. /******************************************************************* Check if the share mode on a file allows it to be deleted or unlinked. Return True if sharing doesn't prevent the operation. ********************************************************************/ BOOL check_file_sharing(connection_struct *conn,char *fname, BOOL rename_op) { int i; int ret = False; share_mode_entry *old_shares = 0; int num_share_modes; SMB_STRUCT_STAT sbuf; pid_t pid = sys_getpid(); SMB_DEV_T dev; SMB_INO_T inode; if (vfs_stat(conn,fname,&sbuf) == -1) return(True); dev = sbuf.st_dev; inode = sbuf.st_ino; lock_share_entry(conn, dev, inode); num_share_modes = get_share_modes(conn, dev, inode, &old_shares); /* * Check if the share modes will give us access. */ if(num_share_modes != 0) { BOOL broke_oplock; do { broke_oplock = False; for(i = 0; i < num_share_modes; i++) { share_mode_entry *share_entry = &old_shares[i]; /* * Break oplocks before checking share modes. See comment in * open_file_shared for details. * Check if someone has an oplock on this file. If so we must * break it before continuing. */ if(BATCH_OPLOCK_TYPE(share_entry->op_type)) { DEBUG(5,("check_file_sharing: breaking oplock (%x) on file %s, \ dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode)); /* Oplock break.... */ unlock_share_entry(conn, dev, inode); if(request_oplock_break(share_entry) == False) { DEBUG(0,("check_file_sharing: 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); return False; } lock_share_entry(conn, dev, inode); broke_oplock = True; break; } /* * If this is a delete request and ALLOW_SHARE_DELETE is set then allow * this to proceed. This takes precedence over share modes. */ if(!rename_op && GET_ALLOW_SHARE_DELETE(share_entry->share_mode)) continue; /* * Someone else has a share lock on it, check to see * if we can too. */ if ((GET_DENY_MODE(share_entry->share_mode) != DENY_DOS) || (share_entry->pid != pid)) goto free_and_exit; } /* end for */ if(broke_oplock) { SAFE_FREE(old_shares); num_share_modes = get_share_modes(conn, dev, inode, &old_shares); } } while(broke_oplock); } /* * XXXX exactly what share mode combinations should be allowed for * deleting/renaming? */ /* * If we got here then either there were no share modes or * all share modes were DENY_DOS and the pid == getpid() or * delete access was requested and all share modes had the * ALLOW_SHARE_DELETE bit set (takes precedence over other * share modes). */ ret = True; free_and_exit: unlock_share_entry(conn, dev, inode); SAFE_FREE(old_shares); return(ret); } #endif