*/
#include "includes.h"
-
-extern struct current_user current_user;
+#include "system/filesys.h"
+#include "../libcli/security/security.h"
+#include "../librpc/gen_ndr/ndr_security.h"
+#include "smbd/smbd.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_ACLS
-/****************************************************************************
- Helper function that gets a security descriptor by connection and
- file name.
- NOTE: This is transitional, in the sense that SMB_VFS_GET_NT_ACL really
- should *not* get a files_struct pointer but a connection_struct ptr
- (automatic by the vfs handle) and the file name and _use_ that!
-****************************************************************************/
-static NTSTATUS conn_get_nt_acl(TALLOC_CTX *mem_ctx,
- struct connection_struct *conn,
- const char *fname,
- SMB_STRUCT_STAT *psbuf,
- struct security_descriptor **psd)
-{
- NTSTATUS status;
- struct files_struct *fsp = NULL;
- struct security_descriptor *secdesc = NULL;
-
- if (!VALID_STAT(*psbuf)) {
- if (SMB_VFS_STAT(conn, fname, psbuf) != 0) {
- return map_nt_error_from_unix(errno);
- }
- }
-
- /* fake a files_struct ptr: */
-
- if (S_ISDIR(psbuf->st_mode)) {
- status = open_directory(conn, NULL, fname, psbuf,
- READ_CONTROL_ACCESS,
- FILE_SHARE_READ|FILE_SHARE_WRITE,
- FILE_OPEN,
- 0,
- FILE_ATTRIBUTE_DIRECTORY,
- NULL, &fsp);
- }
- else {
- status = open_file_stat(conn, NULL, fname, psbuf, &fsp);
- }
-
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3, ("Unable to open file %s: %s\n", fname,
- nt_errstr(status)));
- return status;
- }
-
- status = SMB_VFS_GET_NT_ACL(fsp, fname,
- (OWNER_SECURITY_INFORMATION |
- GROUP_SECURITY_INFORMATION |
- DACL_SECURITY_INFORMATION),
- &secdesc);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(5, ("Unable to get NT ACL for file %s\n", fname));
- goto done;
- }
-
- *psd = talloc_move(mem_ctx, &secdesc);
-
-done:
- close_file(fsp, NORMAL_CLOSE);
- return status;
-}
-
-static bool can_access_file_acl(struct connection_struct *conn,
- const char * fname, SMB_STRUCT_STAT *psbuf,
- uint32_t access_mask)
-{
- bool result;
- NTSTATUS status;
- uint32_t access_granted;
- struct security_descriptor *secdesc = NULL;
-
- status = conn_get_nt_acl(talloc_tos(), conn, fname, psbuf, &secdesc);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(5, ("Could not get acl: %s\n", nt_errstr(status)));
- return false;
- }
-
- result = se_access_check(secdesc, current_user.nt_user_token,
- access_mask, &access_granted, &status);
- TALLOC_FREE(secdesc);
- return result;
-}
-
/****************************************************************************
Actually emulate the in-kernel access checking for delete access. We need
this to successfully return ACCESS_DENIED on a file open for delete access.
****************************************************************************/
-bool can_delete_file_in_directory(connection_struct *conn, const char *fname)
+bool can_delete_file_in_directory(connection_struct *conn,
+ const struct smb_filename *smb_fname)
{
- SMB_STRUCT_STAT sbuf;
TALLOC_CTX *ctx = talloc_tos();
char *dname = NULL;
+ struct smb_filename *smb_fname_parent;
+ bool ret;
if (!CAN_WRITE(conn)) {
return False;
}
+ if (!lp_acl_check_permissions(SNUM(conn))) {
+ /* This option means don't check. */
+ return true;
+ }
+
/* Get the parent directory permission mask and owners. */
- if (!parent_dirname_talloc(ctx,
- fname,
- &dname,
- NULL)) {
+ if (!parent_dirname(ctx, smb_fname->base_name, &dname, NULL)) {
return False;
}
- if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
- return False;
+
+ smb_fname_parent = synthetic_smb_fname(ctx,
+ dname,
+ NULL,
+ NULL,
+ smb_fname->flags);
+ if (smb_fname_parent == NULL) {
+ ret = false;
+ goto out;
+ }
+
+ if(SMB_VFS_STAT(conn, smb_fname_parent) != 0) {
+ ret = false;
+ goto out;
}
/* fast paths first */
- if (!S_ISDIR(sbuf.st_mode)) {
- return False;
+ if (!S_ISDIR(smb_fname_parent->st.st_ex_mode)) {
+ ret = false;
+ goto out;
}
- if (current_user.ut.uid == 0 || conn->admin_user) {
+ if (get_current_uid(conn) == (uid_t)0) {
/* I'm sorry sir, I didn't know you were root... */
- return True;
- }
-
- /* Check primary owner write access. */
- if (current_user.ut.uid == sbuf.st_uid) {
- return (sbuf.st_mode & S_IWUSR) ? True : False;
+ ret = true;
+ goto out;
}
#ifdef S_ISVTX
- /* sticky bit means delete only by owner or root. */
- if (sbuf.st_mode & S_ISVTX) {
- SMB_STRUCT_STAT sbuf_file;
- if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
- if (errno == ENOENT) {
- /* If the file doesn't already exist then
- * yes we'll be able to delete it. */
- return True;
- }
- return False;
+ /* sticky bit means delete only by owner of file or by root or
+ * by owner of directory. */
+ if (smb_fname_parent->st.st_ex_mode & S_ISVTX) {
+ if (!VALID_STAT(smb_fname->st)) {
+ /* If the file doesn't already exist then
+ * yes we'll be able to delete it. */
+ ret = true;
+ goto out;
}
+
/*
* Patch from SATOH Fumiyasu <fumiyas@miraclelinux.com>
* for bug #3348. Don't assume owning sticky bit
* directory means write access allowed.
+ * Fail to delete if we're not the owner of the file,
+ * or the owner of the directory as we have no possible
+ * chance of deleting. Otherwise, go on and check the ACL.
*/
- if (current_user.ut.uid != sbuf_file.st_uid) {
- return False;
+ if ((get_current_uid(conn) !=
+ smb_fname_parent->st.st_ex_uid) &&
+ (get_current_uid(conn) != smb_fname->st.st_ex_uid)) {
+ DEBUG(10,("can_delete_file_in_directory: not "
+ "owner of file %s or directory %s",
+ smb_fname_str_dbg(smb_fname),
+ smb_fname_str_dbg(smb_fname_parent)));
+ ret = false;
+ goto out;
}
}
#endif
/* now for ACL checks */
- return can_access_file_acl(conn, dname, &sbuf, FILE_WRITE_DATA);
+ /*
+ * There's two ways to get the permission to delete a file: First by
+ * having the DELETE bit on the file itself and second if that does
+ * not help, by the DELETE_CHILD bit on the containing directory.
+ *
+ * Here we only check the directory permissions, we will
+ * check the file DELETE permission separately.
+ */
+
+ ret = NT_STATUS_IS_OK(smbd_check_access_rights(conn,
+ smb_fname_parent,
+ false,
+ FILE_DELETE_CHILD));
+ out:
+ TALLOC_FREE(dname);
+ TALLOC_FREE(smb_fname_parent);
+ return ret;
}
/****************************************************************************
- Actually emulate the in-kernel access checking for read/write access. We need
- this to successfully check for ability to write for dos filetimes.
- Note this doesn't take into account share write permissions.
+ Userspace check for write access.
****************************************************************************/
-bool can_access_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf, uint32 access_mask)
+bool can_write_to_file(connection_struct *conn,
+ const struct smb_filename *smb_fname)
{
- if (!(access_mask & (FILE_READ_DATA|FILE_WRITE_DATA))) {
- return False;
- }
- access_mask &= (FILE_READ_DATA|FILE_WRITE_DATA);
-
- /* some fast paths first */
+ return NT_STATUS_IS_OK(smbd_check_access_rights(conn,
+ smb_fname,
+ false,
+ FILE_WRITE_DATA));
+}
- DEBUG(10,("can_access_file: requesting 0x%x on file %s\n",
- (unsigned int)access_mask, fname ));
+/****************************************************************************
+ Check for an existing default Windows ACL on a directory.
+****************************************************************************/
- if (current_user.ut.uid == 0 || conn->admin_user) {
- /* I'm sorry sir, I didn't know you were root... */
- return True;
- }
+bool directory_has_default_acl(connection_struct *conn, const char *fname)
+{
+ struct security_descriptor *secdesc = NULL;
+ unsigned int i;
+ NTSTATUS status;
+ struct smb_filename *smb_fname = synthetic_smb_fname(talloc_tos(),
+ fname,
+ NULL,
+ NULL,
+ 0);
- if (!VALID_STAT(*psbuf)) {
- /* Get the file permission mask and owners. */
- if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
- return False;
- }
+ if (smb_fname == NULL) {
+ return false;
}
- /* Check primary owner access. */
- if (current_user.ut.uid == psbuf->st_uid) {
- switch (access_mask) {
- case FILE_READ_DATA:
- return (psbuf->st_mode & S_IRUSR) ? True : False;
-
- case FILE_WRITE_DATA:
- return (psbuf->st_mode & S_IWUSR) ? True : False;
+ status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
+ SECINFO_DACL, talloc_tos(),
+ &secdesc);
- default: /* FILE_READ_DATA|FILE_WRITE_DATA */
+ if (!NT_STATUS_IS_OK(status) ||
+ secdesc == NULL ||
+ secdesc->dacl == NULL) {
+ TALLOC_FREE(secdesc);
+ return false;
+ }
- if ((psbuf->st_mode & (S_IWUSR|S_IRUSR)) == (S_IWUSR|S_IRUSR)) {
- return True;
- } else {
- return False;
- }
+ for (i = 0; i < secdesc->dacl->num_aces; i++) {
+ struct security_ace *psa = &secdesc->dacl->aces[i];
+ if (psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|
+ SEC_ACE_FLAG_CONTAINER_INHERIT)) {
+ TALLOC_FREE(secdesc);
+ return true;
}
}
-
- /* now for ACL checks */
-
- return can_access_file_acl(conn, fname, psbuf, access_mask);
+ TALLOC_FREE(secdesc);
+ return false;
}
/****************************************************************************
- Userspace check for write access.
- Note this doesn't take into account share write permissions.
+ Check if setting delete on close is allowed on this fsp.
****************************************************************************/
-bool can_write_to_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
+NTSTATUS can_set_delete_on_close(files_struct *fsp, uint32_t dosmode)
{
- return can_access_file(conn, fname, psbuf, FILE_WRITE_DATA);
-}
+ /*
+ * Only allow delete on close for writable files.
+ */
+
+ if ((dosmode & FILE_ATTRIBUTE_READONLY) &&
+ !lp_delete_readonly(SNUM(fsp->conn))) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on close "
+ "flag set but file attribute is readonly.\n",
+ fsp_str_dbg(fsp)));
+ return NT_STATUS_CANNOT_DELETE;
+ }
+
+ /*
+ * Only allow delete on close for writable shares.
+ */
+
+ if (!CAN_WRITE(fsp->conn)) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on "
+ "close flag set but write access denied on share.\n",
+ fsp_str_dbg(fsp)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /*
+ * Only allow delete on close for files/directories opened with delete
+ * intent.
+ */
+
+ if (!(fsp->access_mask & DELETE_ACCESS)) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on "
+ "close flag set but delete access denied.\n",
+ fsp_str_dbg(fsp)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* Don't allow delete on close for non-empty directories. */
+ if (fsp->is_directory) {
+ SMB_ASSERT(!is_ntfs_stream_smb_fname(fsp->fsp_name));
+
+ /* Or the root of a share. */
+ if (ISDOT(fsp->fsp_name->base_name)) {
+ DEBUG(10,("can_set_delete_on_close: can't set delete on "
+ "close for the root of a share.\n"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ return can_delete_directory_fsp(fsp);
+ }
+ return NT_STATUS_OK;
+}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff