split some security related functions in their own files.

(no need to include all of smbd files to use some basic sec functions)

also minor compile fixes
(This used to be commit 66074d3b097d8cf2a231bf08c7f4db62da68189d)

1 files changed, 345 insertions, 0 deletions

diff --git a/source3/lib/privileges.c b/source3/lib/privileges.c
new file mode 100644
index 0000000000..1c23d9e40e
--- /dev/null
+++ b/source3/lib/privileges.c
@@ -0,0 +1,345 @@
+/*
+   Unix SMB/CIFS implementation.
+   Privileges handling functions
+   Copyright (C) Jean François Micouleau	1998-2001
+   Copyright (C) Simo Sorce			2002-2003
+   
+   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"
+
+/* defines */
+
+#define ALLOC_CHECK(ptr, err, label, str) do { if ((ptr) == NULL) { DEBUG(0, ("%s: out of memory!\n", str)); err = NT_STATUS_NO_MEMORY; goto label; } } while(0)
+#define NTSTATUS_CHECK(err, label, str1, str2) do { if (!NT_STATUS_IS_OK(err)) { DEBUG(0, ("%s: %s failed!\n", str1, str2)); } } while(0)
+
+/****************************************************************************
+ Check if a user is a mapped group.
+
+   This function will check if the group SID is mapped onto a
+   system managed gid or onto a winbind manged sid.
+   In the first case it will be threated like a mapped group
+   and the backend should take the member list with a getgrgid
+   and ignore any user that have been possibly set into the group
+   object.
+
+   In the second case, the group is a fully SAM managed group
+   served back to the system through winbind. In this case the
+   members of a Local group are "unrolled" to cope with the fact
+   that unix cannot contain groups inside groups.
+   The backend MUST never call any getgr* / getpw* function or
+   loops with winbind may happen. 
+ ****************************************************************************/
+
+#if 0
+NTSTATUS is_mapped_group(BOOL *mapped, const DOM_SID *sid)
+{
+	NTSTATUS result;
+	gid_t id;
+
+	/* look if mapping exist, do not make idmap alloc an uid if SID is not found */
+	result = idmap_get_gid_from_sid(&id, sid, False);
+	if (NT_STATUS_IS_OK(result)) {
+		*mapped = gid_is_in_winbind_range(id);
+	} else {
+		*mapped = False;
+	}
+
+	return result;
+}
+#endif
+
+/****************************************************************************
+ duplicate alloc luid_attr
+ ****************************************************************************/
+NTSTATUS dupalloc_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la)
+{
+	NTSTATUS ret;
+
+	*new_la = (LUID_ATTR *)talloc(mem_ctx, sizeof(LUID_ATTR));
+	ALLOC_CHECK(new_la, ret, done, "dupalloc_luid_attr");
+
+	(*new_la)->luid.high = old_la->luid.high;
+	(*new_la)->luid.low = old_la->luid.low;
+	(*new_la)->attr = old_la->attr;
+	
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}
+
+/****************************************************************************
+ initialise a privilege list
+ ****************************************************************************/
+NTSTATUS init_privilege(PRIVILEGE_SET **priv_set)
+{
+	NTSTATUS ret;
+	TALLOC_CTX *mem_ctx = talloc_init("privilege set");
+	ALLOC_CHECK(mem_ctx, ret, done, "init_privilege");
+
+	*priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
+	ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
+
+	(*priv_set)->mem_ctx = mem_ctx;
+
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}
+
+NTSTATUS init_priv_with_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **priv_set)
+{
+	NTSTATUS ret;
+
+	*priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
+	ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
+
+	(*priv_set)->mem_ctx = mem_ctx;
+	(*priv_set)->ext_ctx = True;
+
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}
+
+void reset_privilege(PRIVILEGE_SET *priv_set)
+{
+	priv_set->count = 0;
+	priv_set->control = 0;
+	priv_set->set = NULL;
+}
+
+void destroy_privilege(PRIVILEGE_SET **priv_set)
+{
+	reset_privilege(*priv_set);
+	if (!((*priv_set)->ext_ctx))
+		/* mem_ctx is local, destroy it */
+		talloc_destroy((*priv_set)->mem_ctx);
+	*priv_set = NULL;
+}
+
+/****************************************************************************
+ add a privilege to a privilege array
+ ****************************************************************************/
+NTSTATUS add_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
+{
+	NTSTATUS ret;
+	LUID_ATTR *new_set;
+
+	/* check if the privilege is not already in the list */
+	if (NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
+		return NT_STATUS_UNSUCCESSFUL;
+
+	/* we can allocate memory to add the new privilege */
+
+	new_set = (LUID_ATTR *)talloc_realloc(priv_set->mem_ctx, priv_set->set, (priv_set->count + 1) * (sizeof(LUID_ATTR)));
+	ALLOC_CHECK(new_set, ret, done, "add_privilege");
+
+	new_set[priv_set->count].luid.high = set.luid.high;
+	new_set[priv_set->count].luid.low = set.luid.low;
+	new_set[priv_set->count].attr = set.attr;
+
+	priv_set->count++;
+	priv_set->set = new_set;
+
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}
+
+/****************************************************************************
+ add all the privileges to a privilege array
+ ****************************************************************************/
+NTSTATUS add_all_privilege(PRIVILEGE_SET *priv_set)
+{
+	NTSTATUS result = NT_STATUS_OK;
+	LUID_ATTR set;
+
+	set.attr = 0;
+	set.luid.high = 0;
+
+	/* TODO: set a proper list of privileges */
+	set.luid.low = SE_PRIV_ADD_USERS;
+	result = add_privilege(priv_set, set);
+	NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
+
+	set.luid.low = SE_PRIV_ADD_MACHINES;
+	result = add_privilege(priv_set, set);
+	NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
+
+	set.luid.low = SE_PRIV_PRINT_OPERATOR;
+	result = add_privilege(priv_set, set);
+	NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
+
+done:
+	return result;
+}
+
+/****************************************************************************
+ check if the privilege list is empty
+ ****************************************************************************/
+NTSTATUS check_empty_privilege(PRIVILEGE_SET *priv_set)
+{
+	if (!priv_set)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	if (priv_set->count == 0)
+		return NT_STATUS_OK;
+
+	return NT_STATUS_UNSUCCESSFUL;
+}
+
+/****************************************************************************
+ check if the privilege is in the privilege list
+ ****************************************************************************/
+NTSTATUS check_priv_in_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
+{
+	int i;
+
+	if (!priv_set)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	/* if the list is empty, obviously we can't have it */
+	if (NT_STATUS_IS_OK(check_empty_privilege(priv_set)))
+		return NT_STATUS_UNSUCCESSFUL;
+
+	for (i = 0; i < priv_set->count; i++) {
+		LUID_ATTR *cur_set;
+
+		cur_set = &priv_set->set[i];
+		/* check only the low and high part. Checking the attr field has no meaning */
+		if (	(cur_set->luid.low == set.luid.low) &&
+			(cur_set->luid.high == set.luid.high)	) {
+			return NT_STATUS_OK;
+		}
+	}
+
+	return NT_STATUS_UNSUCCESSFUL;
+}
+
+/****************************************************************************
+ remove a privilege from a privilege array
+ ****************************************************************************/
+NTSTATUS remove_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
+{
+	NTSTATUS ret;
+	LUID_ATTR *new_set;
+	LUID_ATTR *old_set;
+	int i,j;
+
+	if (!priv_set)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	/* check if the privilege is in the list */
+	if (!NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
+		return NT_STATUS_UNSUCCESSFUL;
+
+	/* special case if it's the only privilege in the list */
+	if (priv_set->count == 1) {
+		reset_privilege(priv_set);	
+		return NT_STATUS_OK;
+	}
+
+	/* 
+	 * the privilege is there, create a new list,
+	 * and copy the other privileges
+	 */
+
+	old_set = priv_set->set;
+
+	new_set = (LUID_ATTR *)talloc(priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
+	ALLOC_CHECK(new_set, ret, done, "remove_privilege");
+
+	for (i=0, j=0; i < priv_set->count; i++) {
+		if (	(old_set[i].luid.low == set.luid.low) && 
+			(old_set[i].luid.high == set.luid.high)	) {
+		    	continue;
+		}
+		
+		new_set[j].luid.low = old_set[i].luid.low;
+		new_set[j].luid.high = old_set[i].luid.high;
+		new_set[j].attr = old_set[i].attr;
+
+		j++;
+	}
+	
+	if (j != priv_set->count - 1) {
+		DEBUG(0,("remove_privilege: mismatch ! difference is not -1\n"));
+		DEBUGADD(0,("old count:%d, new count:%d\n", priv_set->count, j));
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+		
+	/* ok everything is fine */
+	
+	priv_set->count--;
+	priv_set->set = new_set;
+	
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}
+
+/****************************************************************************
+ duplicates a privilege array
+ the new privilege set must be passed inited
+ (use init_privilege or init_priv_with_ctx)
+ ****************************************************************************/
+NTSTATUS dup_priv_set(PRIVILEGE_SET *new_priv_set, PRIVILEGE_SET *priv_set)
+{
+	NTSTATUS ret;
+	LUID_ATTR *new_set;
+	LUID_ATTR *old_set;
+	int i;
+
+	if (!new_priv_set || !priv_set)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	/* special case if there are no privileges in the list */
+	if (priv_set->count == 0) {
+		return NT_STATUS_OK;
+	}
+
+	/* 
+	 * create a new list,
+	 * and copy the other privileges
+	 */
+
+	old_set = priv_set->set;
+
+	new_set = (LUID_ATTR *)talloc(new_priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
+	ALLOC_CHECK(new_set, ret, done, "dup_priv_set");
+
+	for (i=0; i < priv_set->count; i++) {
+		
+		new_set[i].luid.low = old_set[i].luid.low;
+		new_set[i].luid.high = old_set[i].luid.high;
+		new_set[i].attr = old_set[i].attr;
+	}
+			
+	new_priv_set->count = priv_set->count;
+	new_priv_set->control = priv_set->control;
+	new_priv_set->set = new_set;
+	
+	ret = NT_STATUS_OK;
+
+done:
+	return ret;
+}