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/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001-2010
Copyright (C) Jeremy Allison 2000-2001
Copyright (C) Rafal Szczesniak 2002
Copyright (C) Stefan Metzmacher 2005
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 "auth/auth.h"
#include "auth/auth_sam.h"
#include "libcli/security/security.h"
#include "libcli/auth/libcli_auth.h"
#include "dsdb/samdb/samdb.h"
#include "auth/session_proto.h"
_PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx)
{
NTSTATUS nt_status;
struct auth_session_info *session_info = NULL;
nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
return NULL;
}
return session_info;
}
_PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx, /* Optional, if you don't want privilages */
struct ldb_context *sam_ctx, /* Optional, if you don't want local groups */
struct auth_serversupplied_info *server_info,
uint32_t session_info_flags,
struct auth_session_info **_session_info)
{
struct auth_session_info *session_info;
NTSTATUS nt_status;
unsigned int i, num_sids = 0;
const char *filter;
struct dom_sid *sids = NULL;
const struct dom_sid *anonymous_sid, *system_sid;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
session_info = talloc(tmp_ctx, struct auth_session_info);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
session_info->server_info = talloc_reference(session_info, server_info);
/* unless set otherwise, the session key is the user session
* key from the auth subsystem */
session_info->session_key = server_info->user_session_key;
anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(anonymous_sid, tmp_ctx);
system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(system_sid, tmp_ctx);
sids = talloc_array(tmp_ctx, struct dom_sid, server_info->num_sids);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sids, tmp_ctx);
if (!sids) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
num_sids = server_info->num_sids;
for (i=0; i < server_info->num_sids; i++) {
sids[i] = server_info->sids[i];
}
if (server_info->num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(anonymous_sid, &server_info->sids[PRIMARY_USER_SID_INDEX])) {
/* Don't expand nested groups of system, anonymous etc*/
} else if (server_info->num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(system_sid, &server_info->sids[PRIMARY_USER_SID_INDEX])) {
/* Don't expand nested groups of system, anonymous etc*/
} else if (sam_ctx) {
filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
GROUP_TYPE_BUILTIN_LOCAL_GROUP);
/* Search for each group in the token */
for (i = 0; i < server_info->num_sids; i++) {
char *sid_string;
const char *sid_dn;
DATA_BLOB sid_blob;
sid_string = dom_sid_string(tmp_ctx,
&server_info->sids[i]);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sid_string, server_info);
sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", sid_string);
talloc_free(sid_string);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sid_dn, server_info);
sid_blob = data_blob_string_const(sid_dn);
/* This function takes in memberOf values and expands
* them, as long as they meet the filter - so only
* builtin groups
*
* We already have the SID in the token, so set
* 'only childs' flag to true */
nt_status = dsdb_expand_nested_groups(sam_ctx, &sid_blob, true, filter,
tmp_ctx, &sids, &num_sids);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
}
}
nt_status = security_token_create(session_info,
lp_ctx,
num_sids,
sids,
session_info_flags,
&session_info->security_token);
NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
session_info->credentials = NULL;
talloc_steal(mem_ctx, session_info);
*_session_info = session_info;
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
/* Produce a session_info for an arbitary DN or principal in the local
* DB, assuming the local DB holds all the groups
*
* Supply either a principal or a DN
*/
NTSTATUS authsam_get_session_info_principal(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx,
struct ldb_context *sam_ctx,
const char *principal,
struct ldb_dn *user_dn,
uint32_t session_info_flags,
struct auth_session_info **session_info)
{
NTSTATUS nt_status;
struct auth_serversupplied_info *server_info;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
nt_status = authsam_get_server_info_principal(tmp_ctx, lp_ctx, sam_ctx,
principal, user_dn,
&server_info);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
nt_status = auth_generate_session_info(tmp_ctx, lp_ctx, sam_ctx,
server_info, session_info_flags,
session_info);
if (NT_STATUS_IS_OK(nt_status)) {
talloc_steal(mem_ctx, *session_info);
}
talloc_free(tmp_ctx);
return nt_status;
}
/**
* prints a struct auth_session_info security token to debug output.
*/
void auth_session_info_debug(int dbg_lev,
const struct auth_session_info *session_info)
{
if (!session_info) {
DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
return;
}
security_token_debug(0, dbg_lev, session_info->security_token);
}
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