diff options
Diffstat (limited to 'source3/smbd/open.c')
| -rw-r--r-- | source3/smbd/open.c | 1328 |
1 files changed, 1328 insertions, 0 deletions
diff --git a/source3/smbd/open.c b/source3/smbd/open.c new file mode 100644 index 0000000000..29a854a397 --- /dev/null +++ b/source3/smbd/open.c @@ -0,0 +1,1328 @@ +/* + 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 (ret == -1) { + DEBUG(0,("Error doing fstat on open file %s (%s)\n", fname,strerror(errno) )); + 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, 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; + + fsp_open = open_file(fsp,conn,fname,psbuf,O_WRONLY,0,0); + + /* + * 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 |