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Diffstat (limited to 'source3/smbd/open.c')
-rw-r--r--source3/smbd/open.c152
1 files changed, 125 insertions, 27 deletions
diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index a552dc5b61..3124526c7e 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -83,6 +83,103 @@ static void check_for_pipe(const char *fname)
}
/****************************************************************************
+ Change the ownership of a file to that of the parent directory.
+ Do this by fd if possible.
+****************************************************************************/
+
+void change_owner_to_parent(connection_struct *conn, files_struct *fsp, const char *fname, SMB_STRUCT_STAT *psbuf)
+{
+ const char *parent_path = parent_dirname(fname);
+ SMB_STRUCT_STAT parent_st;
+ int ret;
+
+ ret = SMB_VFS_STAT(conn, parent_path, &parent_st);
+ if (ret == -1) {
+ DEBUG(0,("change_owner_to_parent: failed to stat parent directory %s. Error was %s\n",
+ parent_path, strerror(errno) ));
+ return;
+ }
+
+ if (fsp && fsp->fd != -1) {
+ become_root();
+ ret = SMB_VFS_FCHOWN(fsp, fsp->fd, parent_st.st_uid, (gid_t)-1);
+ unbecome_root();
+ if (ret == -1) {
+ DEBUG(0,("change_owner_to_parent: failed to fchown file %s to parent directory uid %u. \
+Error was %s\n",
+ fname, (unsigned int)parent_st.st_uid, strerror(errno) ));
+ }
+
+ DEBUG(10,("change_owner_to_parent: changed new file %s to parent directory uid %u.\n",
+ fname, (unsigned int)parent_st.st_uid ));
+
+ } else {
+ /* We've already done an lstat into psbuf, and we know it's a directory. If
+ we can do an open/fstat and the dev/ino are the same then we can safely
+ fchown without races. This works under Linux - but should just fail gracefully
+ if any step on the way fails. JRA */
+
+ BOOL need_close_fsp = False;
+ SMB_STRUCT_STAT sbuf;
+ int fd = -1;
+
+ if (!fsp) {
+ int action;
+ fsp = open_directory(conn, fname, psbuf, FILE_GENERIC_READ,
+ SET_DENY_MODE(DENY_NONE)|SET_OPEN_MODE(DOS_OPEN_RDONLY),
+ FILE_EXISTS_OPEN, &action);
+ if (!fsp) {
+ DEBUG(10,("change_owner_to_parent: open_directory on %s failed. Error was %s\n",
+ fname, strerror(errno) ));
+ return;
+ }
+ need_close_fsp = True;
+ }
+ fd = SMB_VFS_OPEN(conn,fname,O_RDONLY,0);
+ if (fd == -1) {
+ DEBUG(10,("change_owner_to_parent: failed to VFS_OPEN directory %s. Error was %s\n",
+ fname, strerror(errno) ));
+ goto out;
+ }
+ ret = SMB_VFS_FSTAT(fsp,fd,&sbuf);
+ if (ret == -1) {
+ DEBUG(10,("change_owner_to_parent: failed to VFS_STAT directory %s. Error was %s\n",
+ fname, strerror(errno) ));
+ goto out;
+ }
+
+ /* Ensure we're pointing at the same place. */
+ if (sbuf.st_dev != psbuf->st_dev || sbuf.st_ino != psbuf->st_ino || !S_ISDIR(sbuf.st_mode)) {
+ DEBUG(0,("change_owner_to_parent: device/inode/mode on director %s changed. Refusing to fchown !\n",
+ fname ));
+ goto out;
+ }
+
+ become_root();
+ ret = SMB_VFS_FCHOWN(fsp, fd, parent_st.st_uid, (gid_t)-1);
+ unbecome_root();
+ if (ret == -1) {
+ DEBUG(10,("change_owner_to_parent: failed to fchown directory %s to parent directory uid %u. \
+Error was %s\n",
+ fname, (unsigned int)parent_st.st_uid, strerror(errno) ));
+ goto out;
+ }
+
+ DEBUG(10,("change_owner_to_parent: changed new directory %s to parent directory uid %u.\n",
+ fname, (unsigned int)parent_st.st_uid ));
+
+ out:
+
+ if (fd != -1) {
+ SMB_VFS_CLOSE(fsp,fd);
+ }
+ if (need_close_fsp) {
+ close_file(fsp, False);
+ }
+ }
+}
+
+/****************************************************************************
Open a file.
****************************************************************************/
@@ -1391,8 +1488,13 @@ flags=0x%X flags2=0x%X mode=0%o returned %d\n",
action = FILE_WAS_OPENED;
if (file_existed && (flags2 & O_TRUNC))
action = FILE_WAS_OVERWRITTEN;
- if (!file_existed)
+ if (!file_existed) {
action = FILE_WAS_CREATED;
+ /* Change the owner if required. */
+ if (lp_inherit_owner(SNUM(conn))) {
+ change_owner_to_parent(conn, fsp, fsp->fsp_name, psbuf);
+ }
+ }
if (paction) {
*paction = action;
@@ -1547,7 +1649,7 @@ int close_file_fchmod(files_struct *fsp)
Open a directory from an NT SMB call.
****************************************************************************/
-files_struct *open_directory(connection_struct *conn, char *fname, SMB_STRUCT_STAT *psbuf,
+files_struct *open_directory(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
uint32 desired_access, int share_mode, int smb_ofun, int *action)
{
extern struct current_user current_user;
@@ -1585,39 +1687,29 @@ files_struct *open_directory(connection_struct *conn, char *fname, SMB_STRUCT_ST
* 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;
- }
+ /* We know bad_path is false as it's caught earlier. */
- 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;
- }
+ NTSTATUS status = mkdir_internal(conn, fname, False);
- if( strchr_m(fname, ':')) {
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(2,("open_directory: unable to create %s. Error was %s\n",
+ fname, strerror(errno) ));
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;
+ /* Ensure we return the correct NT status to the client. */
+ unix_ERR_ntstatus = status;
return NULL;
}
- if(vfs_MkDir(conn,fname, unix_mode(conn,aDIR, fname, True)) < 0) {
- DEBUG(2,("open_directory: unable to create %s. Error was %s\n",
- fname, strerror(errno) ));
+ /* Ensure we're checking for a symlink here.... */
+ /* We don't want to get caught by a symlink racer. */
+
+ if(SMB_VFS_LSTAT(conn,fname, psbuf) != 0) {
file_free(fsp);
return NULL;
}
- if(SMB_VFS_STAT(conn,fname, psbuf) != 0) {
+ if(!S_ISDIR(psbuf->st_mode)) {
+ DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
file_free(fsp);
return NULL;
}
@@ -1674,13 +1766,19 @@ files_struct *open_directory(connection_struct *conn, char *fname, SMB_STRUCT_ST
string_set(&fsp->fsp_name,fname);
if (delete_on_close) {
- NTSTATUS result = set_delete_on_close_internal(fsp, delete_on_close, 0);
+ NTSTATUS status = set_delete_on_close_internal(fsp, delete_on_close, 0);
- if (NT_STATUS_V(result) != NT_STATUS_V(NT_STATUS_OK)) {
+ if (!NT_STATUS_IS_OK(status)) {
file_free(fsp);
return NULL;
}
}
+
+ /* Change the owner if required. */
+ if ((*action == FILE_WAS_CREATED) && lp_inherit_owner(SNUM(conn))) {
+ change_owner_to_parent(conn, fsp, fsp->fsp_name, psbuf);
+ }
+
conn->num_files_open++;
return fsp;
generated by cgit (git 2.34.1) at 2024-07-04 16:33:00 +0000