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/*
* Unix SMB/CIFS implementation.
* Group Policy Object Support
* Copyright (C) Wilco Baan Hofman 2010
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "../libcli/security/dom_sid.h"
#include "../libcli/security/security_descriptor.h"
#include "../librpc/ndr/libndr.h"
#include "../lib/util/charset/charset.h"
#include "param/param.h"
#include "lib/policy/policy.h"
static uint32_t gp_ads_to_dir_access_mask(uint32_t access_mask)
{
uint32_t fs_mask;
/* Copy the standard access mask */
fs_mask = access_mask & 0x001F0000;
/* When READ_PROP and LIST_CONTENTS are set, read access is granted on the GPT */
if (access_mask & SEC_ADS_READ_PROP && access_mask & SEC_ADS_LIST) {
fs_mask |= SEC_STD_SYNCHRONIZE | SEC_DIR_LIST | SEC_DIR_READ_ATTRIBUTE |
SEC_DIR_READ_EA | SEC_DIR_TRAVERSE;
}
/* When WRITE_PROP is set, full write access is granted on the GPT */
if (access_mask & SEC_ADS_WRITE_PROP) {
fs_mask |= SEC_STD_SYNCHRONIZE | SEC_DIR_WRITE_ATTRIBUTE |
SEC_DIR_WRITE_EA | SEC_DIR_ADD_FILE |
SEC_DIR_ADD_SUBDIR;
}
/* Map CREATE_CHILD to add file and add subdir */
if (access_mask & SEC_ADS_CREATE_CHILD)
fs_mask |= SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR;
/* Map ADS delete child to dir delete child */
if (access_mask & SEC_ADS_DELETE_CHILD)
fs_mask |= SEC_DIR_DELETE_CHILD;
return fs_mask;
}
NTSTATUS gp_create_gpt_security_descriptor (TALLOC_CTX *mem_ctx, struct security_descriptor *ds_sd, struct security_descriptor **ret)
{
struct security_descriptor *fs_sd;
uint32_t i;
/* Allocate the file system security descriptor */
fs_sd = talloc(mem_ctx, struct security_descriptor);
/* Copy the basic information from the directory server security descriptor */
fs_sd->owner_sid = talloc_memdup(fs_sd, ds_sd->owner_sid, sizeof(struct dom_sid));
fs_sd->group_sid = talloc_memdup(fs_sd, ds_sd->group_sid, sizeof(struct dom_sid));
fs_sd->type = ds_sd->type;
fs_sd->revision = ds_sd->revision;
/* Copy the sacl */
fs_sd->sacl = security_acl_dup(fs_sd, ds_sd->sacl);
/* Copy the dacl */
fs_sd->dacl = talloc_zero(fs_sd, struct security_acl);
for (i = 0; i < ds_sd->dacl->num_aces; i++) {
char *trustee = dom_sid_string(fs_sd, &ds_sd->dacl->aces[i].trustee);
struct security_ace *ace;
/* Don't add the allow for SID_BUILTIN_PREW2K */
if (!(ds_sd->dacl->aces[i].type & SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT) &&
strcmp(trustee, SID_BUILTIN_PREW2K) == 0) {
talloc_free(trustee);
continue;
}
/* Copy the ace from the directory server security descriptor */
ace = talloc_memdup(fs_sd, &ds_sd->dacl->aces[i], sizeof(struct security_ace));
/* Set specific inheritance flags for within the GPO */
ace->flags |= SEC_ACE_FLAG_OBJECT_INHERIT | SEC_ACE_FLAG_CONTAINER_INHERIT;
if (strcmp(trustee, SID_CREATOR_OWNER) == 0) {
ace->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
}
/* Get a directory access mask from the assigned access mask on the LDAP object */
ace->access_mask = gp_ads_to_dir_access_mask(ace->access_mask);
/* Add the ace to the security descriptor DACL */
security_descriptor_dacl_add(fs_sd, ace);
/* Clean up the allocated data in this iteration */
talloc_free(trustee);
}
*ret = fs_sd;
return NT_STATUS_OK;
}
NTSTATUS gp_create_gpo (struct gp_context *gp_ctx, const char *display_name, struct gp_object **ret)
{
struct GUID guid_struct;
char *guid_str;
char *name;
struct security_descriptor *sd;
TALLOC_CTX *mem_ctx;
struct gp_object *gpo;
NTSTATUS status;
/* Create a forked memory context, as a base for everything here */
mem_ctx = talloc_new(gp_ctx);
/* Create the gpo struct to return later */
gpo = talloc(gp_ctx, struct gp_object);
/* Generate a GUID */
guid_struct = GUID_random();
guid_str = GUID_string2(mem_ctx, &guid_struct);
name = strupper_talloc(mem_ctx, guid_str);
/* Prepare the GPO struct */
gpo->dn = NULL;
gpo->name = name;
gpo->flags = 0;
gpo->version = 0;
gpo->display_name = talloc_strdup(gpo, display_name);
gpo->file_sys_path = talloc_asprintf(gpo, "\\\\%s\\sysvol\\%s\\Policies\\%s", lp_dnsdomain(gp_ctx->lp_ctx), lp_dnsdomain(gp_ctx->lp_ctx), name);
/* Create the GPT */
status = gp_create_gpt(gp_ctx, name, gpo->file_sys_path);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to create GPT\n"));
talloc_free(mem_ctx);
return status;
}
/* Create the LDAP GPO, including CN=User and CN=Machine */
status = gp_create_ldap_gpo(gp_ctx, gpo);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to create LDAP group policy object\n"));
talloc_free(mem_ctx);
return status;
}
/* Get the new security descriptor */
status = gp_get_gpo_info(gp_ctx, gpo->dn, &gpo);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to fetch LDAP group policy object\n"));
talloc_free(mem_ctx);
return status;
}
/* Create matching file and DS security descriptors */
status = gp_create_gpt_security_descriptor(mem_ctx, gpo->security_descriptor, &sd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to convert ADS security descriptor to filesystem security descriptor\n"));
talloc_free(mem_ctx);
return status;
}
/* Set the security descriptor on the filesystem for this GPO */
status = gp_set_gpt_security_descriptor(gp_ctx, gpo, sd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to set security descriptor (ACL) on the file system\n"));
talloc_free(mem_ctx);
return status;
}
talloc_free(mem_ctx);
*ret = gpo;
return NT_STATUS_OK;
}
NTSTATUS gp_set_acl (struct gp_context *gp_ctx, const char *dn_str, const struct security_descriptor *sd)
{
TALLOC_CTX *mem_ctx;
struct security_descriptor *fs_sd;
struct gp_object *gpo;
NTSTATUS status;
/* Create a forked memory context, as a base for everything here */
mem_ctx = talloc_new(gp_ctx);
/* Set the ACL on LDAP database */
status = gp_set_ads_acl(gp_ctx, dn_str, sd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to set ACL on ADS\n"));
talloc_free(mem_ctx);
return status;
}
/* Get the group policy object information, for filesystem location and merged sd */
status = gp_get_gpo_info(gp_ctx, dn_str, &gpo);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to set ACL on ADS\n"));
talloc_free(mem_ctx);
return status;
}
/* Create matching file and DS security descriptors */
status = gp_create_gpt_security_descriptor(mem_ctx, gpo->security_descriptor, &fs_sd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to convert ADS security descriptor to filesystem security descriptor\n"));
talloc_free(mem_ctx);
return status;
}
/* Set the security descriptor on the filesystem for this GPO */
status = gp_set_gpt_security_descriptor(gp_ctx, gpo, fs_sd);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to set security descriptor (ACL) on the file system\n"));
talloc_free(mem_ctx);
return status;
}
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
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