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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 "libcli/security/security.h"
#include "libcli/auth/libcli_auth.h"
#include "dsdb/samdb/samdb.h"
#include "auth/credentials/credentials.h"
#include "param/param.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 auth_context *auth_context,
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_groupSIDs = 0;
const char *account_sid_string;
const char *account_sid_dn;
DATA_BLOB account_sid_blob;
const char *primary_group_string;
const char *primary_group_dn;
DATA_BLOB primary_group_blob;
const char *filter;
struct dom_sid **groupSIDs = NULL;
const struct dom_sid *dom_sid;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
if (!auth_context->sam_ctx) {
DEBUG(0, ("No SAM available, cannot determine local groups\n"));
return NT_STATUS_INVALID_SYSTEM_SERVICE;
}
/* For now, we don't have trusted domains, so we do a very
* simple check to see that the user's SID is in *this*
* domain, and then trust the user account control. When we
* get trusted domains, we should check it's a trusted domain
* in this forest. This elaborate check is to try and avoid a
* nasty security bug if we forget about this later... */
if (server_info->acct_flags & ACB_SVRTRUST) {
dom_sid = samdb_domain_sid(auth_context->sam_ctx);
if (dom_sid) {
if (dom_sid_in_domain(dom_sid, server_info->account_sid)) {
session_info_flags |= AUTH_SESSION_INFO_ENTERPRISE_DC;
} else {
DEBUG(2, ("DC %s is not in our domain. "
"It will not have Enterprise Domain Controllers membership on this server",
server_info->account_name));
}
} else {
DEBUG(2, ("Could not obtain local domain SID, "
"so can not determine if DC %s is a DC of this domain. "
"It will not have Enterprise Domain Controllers membership",
server_info->account_name));
}
}
groupSIDs = talloc_array(tmp_ctx, struct dom_sid *, server_info->n_domain_groups);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
if (!groupSIDs) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
num_groupSIDs = server_info->n_domain_groups;
for (i=0; i < server_info->n_domain_groups; i++) {
groupSIDs[i] = server_info->domain_groups[i];
}
filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
GROUP_TYPE_BUILTIN_LOCAL_GROUP);
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;
/* Search for each group in the token */
/* Expands the account SID - this function takes in
* memberOf-like values, so we fake one up with the
* <SID=S-...> format of DN and then let it expand
* them, as long as they meet the filter - so only
* builtin groups
*
* We already have the primary group in the token, so set
* 'only childs' flag to true
*/
account_sid_string = dom_sid_string(tmp_ctx, server_info->account_sid);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_string, server_info);
account_sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", account_sid_string);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_dn, server_info);
account_sid_blob = data_blob_string_const(account_sid_dn);
nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &account_sid_blob, true, filter,
tmp_ctx, &groupSIDs, &num_groupSIDs);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
/* Expands the primary group - this function takes in
* memberOf-like values, so we fake one up with the
* <SID=S-...> format of DN and then let it expand
* them, as long as they meet the filter - so only
* builtin groups
*
* We already have the primary group in the token, so set
* 'only childs' flag to true
*/
primary_group_string = dom_sid_string(tmp_ctx, server_info->primary_group_sid);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
primary_group_blob = data_blob_string_const(primary_group_dn);
nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &primary_group_blob, true, filter,
tmp_ctx, &groupSIDs, &num_groupSIDs);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
for (i = 0; i < server_info->n_domain_groups; i++) {
const char *group_string;
const char *group_dn;
DATA_BLOB group_blob;
group_string = dom_sid_string(tmp_ctx, server_info->domain_groups[i]);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_string, server_info);
group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", group_string);
NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_dn, server_info);
group_blob = data_blob_string_const(group_dn);
/* This function takes in memberOf values and expands
* them, as long as they meet the filter - so only
* builtin groups */
nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &group_blob, true, filter,
tmp_ctx, &groupSIDs, &num_groupSIDs);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
}
nt_status = security_token_create(session_info,
auth_context->event_ctx,
auth_context->lp_ctx,
server_info->account_sid,
server_info->primary_group_sid,
num_groupSIDs,
groupSIDs,
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;
return NT_STATUS_OK;
}
/**
* 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(dbg_lev, session_info->security_token);
}
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