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/*
Unix SMB/CIFS implementation.
Deal with unix elements in the security token
Copyright (C) Andrew Tridgell 2004
Copyright (C) Andrew Bartlett 2011
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/wbclient/wbclient.h"
#include "param/param.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/*
form a security_unix_token from the current security_token
*/
NTSTATUS security_token_to_unix_token(TALLOC_CTX *mem_ctx,
struct security_token *token,
struct security_unix_token **sec)
{
uint32_t s, g;
NTSTATUS status;
struct id_map *ids;
bool match;
match = security_token_is_system(token);
if (match) {
/*
* SYSTEM user uid and gid is 0
*/
*sec = talloc_zero(mem_ctx, struct security_unix_token);
if (*sec == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
/* we can't do unix security without a user and group */
if (token->num_sids < PRIMARY_SIDS_COUNT) {
return NT_STATUS_ACCESS_DENIED;
}
*sec = talloc_zero(mem_ctx, struct security_unix_token);
if (*sec == NULL) {
return NT_STATUS_NO_MEMORY;
}
ids = talloc_zero_array(mem_ctx, struct id_map, token->num_sids);
NT_STATUS_HAVE_NO_MEMORY(ids);
for (s=0; s < token->num_sids; s++) {
ids[s].sid = &token->sids[s];
ids[s].status = ID_UNKNOWN;
}
status = wbc_sids_to_xids(ids, token->num_sids);
NT_STATUS_NOT_OK_RETURN(status);
g = token->num_sids;
if (ids[PRIMARY_USER_SID_INDEX].xid.type != ID_TYPE_BOTH) {
g--;
}
(*sec)->ngroups = g;
(*sec)->groups = talloc_array(*sec, gid_t, (*sec)->ngroups);
NT_STATUS_HAVE_NO_MEMORY((*sec)->groups);
g=0;
if (ids[PRIMARY_USER_SID_INDEX].xid.type == ID_TYPE_BOTH) {
(*sec)->uid = ids[0].xid.id;
(*sec)->groups[g] = ids[0].xid.id;
g++;
} else if (ids[PRIMARY_USER_SID_INDEX].xid.type == ID_TYPE_UID) {
(*sec)->uid = ids[0].xid.id;
} else {
struct dom_sid_buf buf;
DEBUG(0, ("Unable to convert first SID (%s) in user token to a UID. Conversion was returned as type %d, full token:\n",
dom_sid_str_buf(ids[PRIMARY_USER_SID_INDEX].sid, &buf),
(int)ids[PRIMARY_USER_SID_INDEX].xid.type));
security_token_debug(DBGC_AUTH, 0, token);
return NT_STATUS_INVALID_SID;
}
if (ids[PRIMARY_GROUP_SID_INDEX].xid.type == ID_TYPE_BOTH ||
ids[PRIMARY_GROUP_SID_INDEX].xid.type == ID_TYPE_GID) {
(*sec)->gid = ids[PRIMARY_GROUP_SID_INDEX].xid.id;
(*sec)->groups[g] = ids[PRIMARY_GROUP_SID_INDEX].xid.id;
g++;
} else {
struct dom_sid_buf buf;
DEBUG(0, ("Unable to convert second SID (%s) in user token to a GID. Conversion was returned as type %d, full token:\n",
dom_sid_str_buf(ids[PRIMARY_GROUP_SID_INDEX].sid, &buf),
(int)ids[PRIMARY_GROUP_SID_INDEX].xid.type));
security_token_debug(DBGC_AUTH, 0, token);
return NT_STATUS_INVALID_SID;
}
for (s=REMAINING_SIDS_INDEX; s < token->num_sids; s++) {
if (ids[s].xid.type == ID_TYPE_BOTH ||
ids[s].xid.type == ID_TYPE_GID) {
(*sec)->groups[g] = ids[s].xid.id;
g++;
} else {
struct dom_sid_buf buf;
DEBUG(0, ("Unable to convert SID (%s) at index %u in user token to a GID. Conversion was returned as type %d, full token:\n",
dom_sid_str_buf(ids[s].sid, &buf),
(unsigned int)s, (int)ids[s].xid.type));
security_token_debug(DBGC_AUTH, 0, token);
return NT_STATUS_INVALID_SID;
}
}
DEBUG(5, ("Successfully converted security token to a unix token:"));
security_token_debug(0, 5, token);
TALLOC_FREE(ids);
return NT_STATUS_OK;
}
/*
* Fill in the unix_info elements in a struct session_info
*/
NTSTATUS fill_unix_info(struct loadparm_context *lp_ctx,
const char *original_user_name,
struct auth_session_info *session_info)
{
session_info->unix_info = talloc_zero(session_info,
struct auth_user_info_unix);
NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info);
session_info->unix_info->unix_name =
talloc_asprintf(session_info->unix_info,
"%s%s%s", session_info->info->domain_name,
lpcfg_winbind_separator(lp_ctx),
session_info->info->account_name);
NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->unix_name);
if (original_user_name == NULL) {
original_user_name = session_info->unix_info->unix_name;
}
session_info->unix_info->sanitized_username =
talloc_alpha_strcpy(session_info->unix_info,
original_user_name,
". _-$");
NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->sanitized_username);
return NT_STATUS_OK;
}
/*
Fill in the auth_user_info_unix and auth_unix_token elements in a struct session_info
*/
NTSTATUS auth_session_info_fill_unix(struct loadparm_context *lp_ctx,
const char *original_user_name,
struct auth_session_info *session_info)
{
NTSTATUS status = NT_STATUS_OK;
status = security_token_to_unix_token(session_info,
session_info->security_token,
&session_info->unix_token);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
status = fill_unix_info(lp_ctx,
original_user_name,
session_info);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
return NT_STATUS_OK;
}
/*
* Set the given auth_user_info_unix and auth_unix_token elements in a
* struct session_info, similar auth_session_info_fill_unix().
* Receives the uid and gid for the unix token as parameters and does
* not query the unix token from winbind (via security_token_to_unix_token()).
* This is useful to fill a user session info manually if winbind is not
* available.
*/
NTSTATUS auth_session_info_set_unix(struct loadparm_context *lp_ctx,
const char *original_user_name,
int uid,
int gid,
struct auth_session_info *session_info)
{
NTSTATUS status;
session_info->unix_token = talloc_zero(session_info,
struct security_unix_token);
if (session_info->unix_token == NULL) {
return NT_STATUS_NO_MEMORY;
}
session_info->unix_token->uid = uid;
session_info->unix_token->gid = gid;
status = fill_unix_info(lp_ctx,
original_user_name,
session_info);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
return NT_STATUS_OK;
}
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