/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001-2011
Copyright (C) Jeremy Allison 2000-2001
Copyright (C) Rafal Szczesniak 2002
Copyright (C) Volker Lendecke 2006-2008
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 .
*/
#include "dom_sid.h"
#include "includes.h"
#include "auth.h"
#include "lib/util_unixsids.h"
#include "../libcli/auth/libcli_auth.h"
#include "rpc_client/init_lsa.h"
#include "../libcli/security/security.h"
#include "../lib/util/util_pw.h"
#include "lib/winbind_util.h"
#include "passdb.h"
#include "../librpc/gen_ndr/ndr_auth.h"
#include "../auth/auth_sam_reply.h"
#include "../librpc/gen_ndr/idmap.h"
#include "lib/param/loadparm.h"
#include "../lib/tsocket/tsocket.h"
#include "rpc_client/util_netlogon.h"
#include "source4/auth/auth.h"
#include "auth/auth_util.h"
#include "source3/lib/substitute.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/****************************************************************************
Create a UNIX user on demand.
****************************************************************************/
static int _smb_create_user(const char *domain, const char *unix_username, const char *homedir)
{
TALLOC_CTX *ctx = talloc_tos();
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
char *add_script;
int ret;
add_script = lp_add_user_script(ctx, lp_sub);
if (!add_script || !*add_script) {
return -1;
}
add_script = talloc_all_string_sub(ctx,
add_script,
"%u",
unix_username);
if (!add_script) {
return -1;
}
if (domain) {
add_script = talloc_all_string_sub(ctx,
add_script,
"%D",
domain);
if (!add_script) {
return -1;
}
}
if (homedir) {
add_script = talloc_all_string_sub(ctx,
add_script,
"%H",
homedir);
if (!add_script) {
return -1;
}
}
ret = smbrun(add_script, NULL, NULL);
flush_pwnam_cache();
DEBUG(ret ? 0 : 3,
("smb_create_user: Running the command `%s' gave %d\n",
add_script,ret));
return ret;
}
/****************************************************************************
Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/
NTSTATUS make_user_info_map(TALLOC_CTX *mem_ctx,
struct auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const char *workstation_name,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
const char *service_description,
const DATA_BLOB *lm_pwd,
const DATA_BLOB *nt_pwd,
const struct samr_Password *lm_interactive_pwd,
const struct samr_Password *nt_interactive_pwd,
const char *plaintext,
enum auth_password_state password_state)
{
const char *domain;
NTSTATUS result;
bool was_mapped;
char *internal_username = NULL;
was_mapped = map_username(talloc_tos(), smb_name, &internal_username);
if (!internal_username) {
return NT_STATUS_NO_MEMORY;
}
DEBUG(5, ("Mapping user [%s]\\[%s] from workstation [%s]\n",
client_domain, smb_name, workstation_name));
/*
* We let the auth stack canonicalize, username
* and domain.
*/
domain = client_domain;
result = make_user_info(mem_ctx, user_info, smb_name, internal_username,
client_domain, domain, workstation_name,
remote_address, local_address,
service_description, lm_pwd, nt_pwd,
lm_interactive_pwd, nt_interactive_pwd,
plaintext, password_state);
if (NT_STATUS_IS_OK(result)) {
/* did we actually map the user to a different name? */
(*user_info)->was_mapped = was_mapped;
}
return result;
}
/****************************************************************************
Create an auth_usersupplied_data, making the DATA_BLOBs here.
Decrypt and encrypt the passwords.
****************************************************************************/
bool make_user_info_netlogon_network(TALLOC_CTX *mem_ctx,
struct auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const char *workstation_name,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
uint32_t logon_parameters,
const uchar *lm_network_pwd,
int lm_pwd_len,
const uchar *nt_network_pwd,
int nt_pwd_len)
{
bool ret;
NTSTATUS status;
DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
status = make_user_info_map(mem_ctx, user_info,
smb_name, client_domain,
workstation_name,
remote_address,
local_address,
"SamLogon",
lm_pwd_len ? &lm_blob : NULL,
nt_pwd_len ? &nt_blob : NULL,
NULL, NULL, NULL,
AUTH_PASSWORD_RESPONSE);
if (NT_STATUS_IS_OK(status)) {
(*user_info)->logon_parameters = logon_parameters;
}
ret = NT_STATUS_IS_OK(status) ? true : false;
data_blob_free(&lm_blob);
data_blob_free(&nt_blob);
return ret;
}
/****************************************************************************
Create an auth_usersupplied_data, making the DATA_BLOBs here.
Decrypt and encrypt the passwords.
****************************************************************************/
bool make_user_info_netlogon_interactive(TALLOC_CTX *mem_ctx,
struct auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const char *workstation_name,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
uint32_t logon_parameters,
const uchar chal[8],
const uchar lm_interactive_pwd[16],
const uchar nt_interactive_pwd[16])
{
struct samr_Password lm_pwd;
struct samr_Password nt_pwd;
unsigned char local_lm_response[24];
unsigned char local_nt_response[24];
int rc;
if (lm_interactive_pwd)
memcpy(lm_pwd.hash, lm_interactive_pwd, sizeof(lm_pwd.hash));
if (nt_interactive_pwd)
memcpy(nt_pwd.hash, nt_interactive_pwd, sizeof(nt_pwd.hash));
if (lm_interactive_pwd) {
rc = SMBOWFencrypt(lm_pwd.hash, chal,
local_lm_response);
if (rc != 0) {
return false;
}
}
if (nt_interactive_pwd) {
rc = SMBOWFencrypt(nt_pwd.hash, chal,
local_nt_response);
if (rc != 0) {
return false;
}
}
{
bool ret;
NTSTATUS nt_status;
DATA_BLOB local_lm_blob = data_blob_null;
DATA_BLOB local_nt_blob = data_blob_null;
if (lm_interactive_pwd) {
local_lm_blob = data_blob(local_lm_response,
sizeof(local_lm_response));
}
if (nt_interactive_pwd) {
local_nt_blob = data_blob(local_nt_response,
sizeof(local_nt_response));
}
nt_status = make_user_info_map(
mem_ctx,
user_info,
smb_name, client_domain, workstation_name,
remote_address,
local_address,
"SamLogon",
lm_interactive_pwd ? &local_lm_blob : NULL,
nt_interactive_pwd ? &local_nt_blob : NULL,
lm_interactive_pwd ? &lm_pwd : NULL,
nt_interactive_pwd ? &nt_pwd : NULL,
NULL, AUTH_PASSWORD_HASH);
if (NT_STATUS_IS_OK(nt_status)) {
(*user_info)->logon_parameters = logon_parameters;
(*user_info)->flags |= USER_INFO_INTERACTIVE_LOGON;
}
ret = NT_STATUS_IS_OK(nt_status) ? true : false;
data_blob_free(&local_lm_blob);
data_blob_free(&local_nt_blob);
return ret;
}
}
/****************************************************************************
Create an auth_usersupplied_data structure
****************************************************************************/
bool make_user_info_for_reply(TALLOC_CTX *mem_ctx,
struct auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
const char *service_description,
const uint8_t chal[8],
DATA_BLOB plaintext_password)
{
DATA_BLOB local_lm_blob;
DATA_BLOB local_nt_blob;
NTSTATUS ret;
char *plaintext_password_string;
/*
* Not encrypted - do so.
*/
DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
"format.\n"));
if (plaintext_password.data && plaintext_password.length) {
unsigned char local_lm_response[24];
#ifdef DEBUG_PASSWORD
DEBUG(10,("Unencrypted password (len %d):\n",
(int)plaintext_password.length));
dump_data(100, plaintext_password.data,
plaintext_password.length);
#endif
SMBencrypt( (const char *)plaintext_password.data,
(const uchar*)chal, local_lm_response);
local_lm_blob = data_blob(local_lm_response, 24);
/* We can't do an NT hash here, as the password needs to be
case insensitive */
local_nt_blob = data_blob_null;
} else {
local_lm_blob = data_blob_null;
local_nt_blob = data_blob_null;
}
plaintext_password_string = talloc_strndup(talloc_tos(),
(const char *)plaintext_password.data,
plaintext_password.length);
if (!plaintext_password_string) {
return false;
}
ret = make_user_info(mem_ctx,
user_info, smb_name, smb_name, client_domain, client_domain,
get_remote_machine_name(),
remote_address,
local_address,
service_description,
local_lm_blob.data ? &local_lm_blob : NULL,
local_nt_blob.data ? &local_nt_blob : NULL,
NULL, NULL,
plaintext_password_string,
AUTH_PASSWORD_PLAIN);
if (plaintext_password_string) {
memset(plaintext_password_string, '\0', strlen(plaintext_password_string));
talloc_free(plaintext_password_string);
}
data_blob_free(&local_lm_blob);
return NT_STATUS_IS_OK(ret) ? true : false;
}
/****************************************************************************
Create an auth_usersupplied_data structure
****************************************************************************/
NTSTATUS make_user_info_for_reply_enc(TALLOC_CTX *mem_ctx,
struct auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
const char *service_description,
DATA_BLOB lm_resp, DATA_BLOB nt_resp)
{
bool allow_raw = lp_raw_ntlmv2_auth();
if (!allow_raw && nt_resp.length >= 48) {
/*
* NTLMv2_RESPONSE has at least 48 bytes
* and should only be supported via NTLMSSP.
*/
DEBUG(2,("Rejecting raw NTLMv2 authentication with "
"user [%s\\%s] from[%s]\n",
client_domain, smb_name,
tsocket_address_string(remote_address, mem_ctx)));
return NT_STATUS_INVALID_PARAMETER;
}
return make_user_info(mem_ctx,
user_info, smb_name, smb_name,
client_domain, client_domain,
get_remote_machine_name(),
remote_address,
local_address,
service_description,
lm_resp.data && (lm_resp.length > 0) ? &lm_resp : NULL,
nt_resp.data && (nt_resp.length > 0) ? &nt_resp : NULL,
NULL, NULL, NULL,
AUTH_PASSWORD_RESPONSE);
}
/****************************************************************************
Create a guest user_info blob, for anonymous authentication.
****************************************************************************/
bool make_user_info_guest(TALLOC_CTX *mem_ctx,
const struct tsocket_address *remote_address,
const struct tsocket_address *local_address,
const char *service_description,
struct auth_usersupplied_info **user_info)
{
NTSTATUS nt_status;
nt_status = make_user_info(mem_ctx,
user_info,
"","",
"","",
"",
remote_address,
local_address,
service_description,
NULL, NULL,
NULL, NULL,
NULL,
AUTH_PASSWORD_RESPONSE);
return NT_STATUS_IS_OK(nt_status) ? true : false;
}
static NTSTATUS log_nt_token(struct security_token *token)
{
TALLOC_CTX *frame = talloc_stackframe();
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
char *command;
char *group_sidstr;
struct dom_sid_buf buf;
size_t i;
if ((lp_log_nt_token_command(frame, lp_sub) == NULL) ||
(strlen(lp_log_nt_token_command(frame, lp_sub)) == 0)) {
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
group_sidstr = talloc_strdup(frame, "");
for (i=1; inum_sids; i++) {
group_sidstr = talloc_asprintf(
frame, "%s %s", group_sidstr,
dom_sid_str_buf(&token->sids[i], &buf));
}
command = talloc_string_sub(
frame, lp_log_nt_token_command(frame, lp_sub),
"%s", dom_sid_str_buf(&token->sids[0], &buf));
command = talloc_string_sub(frame, command, "%t", group_sidstr);
if (command == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
DEBUG(8, ("running command: [%s]\n", command));
if (smbrun(command, NULL, NULL) != 0) {
DEBUG(0, ("Could not log NT token\n"));
TALLOC_FREE(frame);
return NT_STATUS_ACCESS_DENIED;
}
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
/*
* Create the token to use from server_info->info3 and
* server_info->sids (the info3/sam groups). Find the unix gids.
*/
NTSTATUS create_local_token(TALLOC_CTX *mem_ctx,
const struct auth_serversupplied_info *server_info,
DATA_BLOB *session_key,
const char *smb_username, /* for ->sanitized_username, for %U subs */
struct auth_session_info **session_info_out)
{
struct security_token *t;
NTSTATUS status;
size_t i;
struct dom_sid tmp_sid;
struct auth_session_info *session_info = NULL;
struct unixid *ids;
bool is_allowed = false;
/* Ensure we can't possible take a code path leading to a
* null deref. */
if (!server_info) {
return NT_STATUS_LOGON_FAILURE;
}
if (is_allowed_domain(server_info->info3->base.logon_domain.string)) {
is_allowed = true;
}
/* Check if we have extra info about the user. */
if (dom_sid_in_domain(&global_sid_Unix_Users,
&server_info->extra.user_sid) ||
dom_sid_in_domain(&global_sid_Unix_Groups,
&server_info->extra.pgid_sid))
{
is_allowed = true;
}
if (!is_allowed) {
DBG_NOTICE("Authentication failed for user [%s] "
"from firewalled domain [%s]\n",
server_info->info3->base.account_name.string,
server_info->info3->base.logon_domain.string);
return NT_STATUS_AUTHENTICATION_FIREWALL_FAILED;
}
if (server_info->cached_session_info != NULL) {
session_info = copy_session_info(mem_ctx,
server_info->cached_session_info);
if (session_info == NULL) {
goto nomem;
}
/* This is a potentially untrusted username for use in %U */
session_info->unix_info->sanitized_username =
talloc_alpha_strcpy(session_info->unix_info,
smb_username,
SAFE_NETBIOS_CHARS "$");
if (session_info->unix_info->sanitized_username == NULL) {
goto nomem;
}
session_info->unique_session_token = GUID_random();
*session_info_out = session_info;
return NT_STATUS_OK;
}
session_info = talloc_zero(mem_ctx, struct auth_session_info);
if (!session_info) {
goto nomem;
}
session_info->unix_token = talloc_zero(session_info, struct security_unix_token);
if (!session_info->unix_token) {
goto nomem;
}
session_info->unix_token->uid = server_info->utok.uid;
session_info->unix_token->gid = server_info->utok.gid;
session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
if (!session_info->unix_info) {
goto nomem;
}
session_info->unix_info->unix_name = talloc_strdup(session_info, server_info->unix_name);
if (!session_info->unix_info->unix_name) {
goto nomem;
}
/* This is a potentially untrusted username for use in %U */
session_info->unix_info->sanitized_username =
talloc_alpha_strcpy(session_info->unix_info,
smb_username,
SAFE_NETBIOS_CHARS "$");
if (session_info->unix_info->sanitized_username == NULL) {
goto nomem;
}
if (session_key) {
data_blob_free(&session_info->session_key);
session_info->session_key = data_blob_talloc(session_info,
session_key->data,
session_key->length);
if (!session_info->session_key.data && session_key->length) {
goto nomem;
}
} else {
session_info->session_key = data_blob_talloc( session_info, server_info->session_key.data,
server_info->session_key.length);
}
/* We need to populate session_info->info with the information found in server_info->info3 */
status = make_user_info_SamBaseInfo(session_info, "", &server_info->info3->base,
server_info->guest == false,
&session_info->info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("conversion of info3 into auth_user_info failed!\n"));
goto fail;
}
/*
* If the user name was mapped to some local unix user,
* we can not make much use of the SIDs the
* domain controller provided us with.
*/
if (server_info->nss_token) {
char *found_username = NULL;
status = create_token_from_username(session_info,
server_info->unix_name,
server_info->guest,
&session_info->unix_token->uid,
&session_info->unix_token->gid,
&found_username,
&session_info->security_token);
if (NT_STATUS_IS_OK(status)) {
session_info->unix_info->unix_name = found_username;
}
} else {
status = create_local_nt_token_from_info3(session_info,
server_info->guest,
server_info->info3,
&server_info->extra,
&session_info->security_token);
}
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
/* Convert the SIDs to gids. */
session_info->unix_token->ngroups = 0;
session_info->unix_token->groups = NULL;
t = session_info->security_token;
ids = talloc_array(talloc_tos(), struct unixid,
t->num_sids);
if (ids == NULL) {
goto nomem;
}
if (!sids_to_unixids(t->sids, t->num_sids, ids)) {
goto nomem;
}
for (i=0; inum_sids; i++) {
if (i == 0 && ids[i].type != ID_TYPE_BOTH) {
continue;
}
if (ids[i].type != ID_TYPE_GID &&
ids[i].type != ID_TYPE_BOTH) {
struct dom_sid_buf buf;
DEBUG(10, ("Could not convert SID %s to gid, "
"ignoring it\n",
dom_sid_str_buf(&t->sids[i], &buf)));
continue;
}
if (!add_gid_to_array_unique(session_info->unix_token,
ids[i].id,
&session_info->unix_token->groups,
&session_info->unix_token->ngroups)) {
goto nomem;
}
}
/*
* Add the "Unix Group" SID for each gid to catch mapped groups
* and their Unix equivalent. This is to solve the backwards
* compatibility problem of 'valid users = +ntadmin' where
* ntadmin has been paired with "Domain Admins" in the group
* mapping table. Otherwise smb.conf would need to be changed
* to 'valid user = "Domain Admins"'. --jerry
*
* For consistency we also add the "Unix User" SID,
* so that the complete unix token is represented within
* the nt token.
*/
uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
status = add_sid_to_array_unique(
session_info->security_token,
&tmp_sid,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
gid_to_unix_groups_sid(session_info->unix_token->gid, &tmp_sid);
status = add_sid_to_array_unique(
session_info->security_token,
&tmp_sid,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
for ( i=0; iunix_token->ngroups; i++ ) {
gid_to_unix_groups_sid(session_info->unix_token->groups[i], &tmp_sid);
status = add_sid_to_array_unique(
session_info->security_token,
&tmp_sid,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
}
security_token_debug(DBGC_AUTH, 10, session_info->security_token);
debug_unix_user_token(DBGC_AUTH, 10,
session_info->unix_token->uid,
session_info->unix_token->gid,
session_info->unix_token->ngroups,
session_info->unix_token->groups);
status = log_nt_token(session_info->security_token);
if (!NT_STATUS_IS_OK(status)) {
goto fail;
}
session_info->unique_session_token = GUID_random();
*session_info_out = session_info;
return NT_STATUS_OK;
nomem:
status = NT_STATUS_NO_MEMORY;
fail:
TALLOC_FREE(session_info);
return status;
}
NTSTATUS auth3_user_info_dc_add_hints(struct auth_user_info_dc *user_info_dc,
uid_t uid,
gid_t gid,
uint32_t flags)
{
uint32_t orig_num_sids = user_info_dc->num_sids;
struct dom_sid tmp_sid = { 0, };
NTSTATUS status;
/*
* We add S-5-88-1-X in order to pass the uid
* for the unix token.
*/
sid_compose(&tmp_sid,
&global_sid_Unix_NFS_Users,
(uint32_t)uid);
status = add_sid_to_array_attrs_unique(user_info_dc->sids,
&tmp_sid,
SE_GROUP_DEFAULT_FLAGS,
&user_info_dc->sids,
&user_info_dc->num_sids);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("add_sid_to_array_unique failed: %s\n",
nt_errstr(status)));
goto fail;
}
/*
* We add S-5-88-2-X in order to pass the gid
* for the unix token.
*/
sid_compose(&tmp_sid,
&global_sid_Unix_NFS_Groups,
(uint32_t)gid);
status = add_sid_to_array_attrs_unique(user_info_dc->sids,
&tmp_sid,
SE_GROUP_DEFAULT_FLAGS,
&user_info_dc->sids,
&user_info_dc->num_sids);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("add_sid_to_array_unique failed: %s\n",
nt_errstr(status)));
goto fail;
}
/*
* We add S-5-88-3-X in order to pass some flags
* (AUTH3_UNIX_HINT_*) to auth3_create_session_info().
*/
sid_compose(&tmp_sid,
&global_sid_Unix_NFS_Mode,
flags);
status = add_sid_to_array_attrs_unique(user_info_dc->sids,
&tmp_sid,
SE_GROUP_DEFAULT_FLAGS,
&user_info_dc->sids,
&user_info_dc->num_sids);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("add_sid_to_array_unique failed: %s\n",
nt_errstr(status)));
goto fail;
}
return NT_STATUS_OK;
fail:
user_info_dc->num_sids = orig_num_sids;
return status;
}
static NTSTATUS auth3_session_info_create(
TALLOC_CTX *mem_ctx,
const struct auth_user_info_dc *user_info_dc,
const char *original_user_name,
uint32_t session_info_flags,
struct auth_session_info **session_info_out)
{
TALLOC_CTX *frame = talloc_stackframe();
struct auth_session_info *session_info = NULL;
uid_t hint_uid = -1;
bool found_hint_uid = false;
uid_t hint_gid = -1;
bool found_hint_gid = false;
uint32_t hint_flags = 0;
bool found_hint_flags = false;
bool need_getpwuid = false;
struct unixid *ids = NULL;
uint32_t num_gids = 0;
gid_t *gids = NULL;
struct dom_sid tmp_sid = { 0, };
NTSTATUS status;
size_t i;
bool ok;
*session_info_out = NULL;
if (user_info_dc->num_sids == 0) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (user_info_dc->info == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (user_info_dc->info->account_name == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
session_info = talloc_zero(mem_ctx, struct auth_session_info);
if (session_info == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
/* keep this under frame for easier cleanup */
talloc_reparent(mem_ctx, frame, session_info);
session_info->info = auth_user_info_copy(session_info,
user_info_dc->info);
if (session_info->info == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
session_info->security_token = talloc_zero(session_info,
struct security_token);
if (session_info->security_token == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
/*
* Avoid a lot of reallocations and allocate what we'll
* use in most cases.
*/
session_info->security_token->sids = talloc_zero_array(
session_info->security_token,
struct dom_sid,
user_info_dc->num_sids);
if (session_info->security_token->sids == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
for (i = PRIMARY_USER_SID_INDEX; i < user_info_dc->num_sids; i++) {
struct security_token *nt_token = session_info->security_token;
int cmp;
/*
* S-1-5-88-X-Y sids are only used to give hints
* to the unix token construction.
*
* S-1-5-88-1-Y gives the uid=Y
* S-1-5-88-2-Y gives the gid=Y
* S-1-5-88-3-Y gives flags=Y: AUTH3_UNIX_HINT_*
*/
cmp = dom_sid_compare_domain(&global_sid_Unix_NFS,
&user_info_dc->sids[i].sid);
if (cmp == 0) {
bool match;
uint32_t hint = 0;
match = sid_peek_rid(&user_info_dc->sids[i].sid, &hint);
if (!match) {
continue;
}
match = dom_sid_in_domain(&global_sid_Unix_NFS_Users,
&user_info_dc->sids[i].sid);
if (match) {
if (found_hint_uid) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
found_hint_uid = true;
hint_uid = (uid_t)hint;
continue;
}
match = dom_sid_in_domain(&global_sid_Unix_NFS_Groups,
&user_info_dc->sids[i].sid);
if (match) {
if (found_hint_gid) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
found_hint_gid = true;
hint_gid = (gid_t)hint;
continue;
}
match = dom_sid_in_domain(&global_sid_Unix_NFS_Mode,
&user_info_dc->sids[i].sid);
if (match) {
if (found_hint_flags) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
found_hint_flags = true;
hint_flags = hint;
continue;
}
continue;
}
status = add_sid_to_array_unique(nt_token->sids,
&user_info_dc->sids[i].sid,
&nt_token->sids,
&nt_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
}
/*
* We need at least one usable SID
*/
if (session_info->security_token->num_sids == 0) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
/*
* We need all tree hints: uid, gid, flags
* or none of them.
*/
if (found_hint_uid || found_hint_gid || found_hint_flags) {
if (!found_hint_uid) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (!found_hint_gid) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (!found_hint_flags) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
}
if (!(user_info_dc->info->user_flags & NETLOGON_GUEST)) {
session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
}
status = finalize_local_nt_token(session_info->security_token,
session_info_flags);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
/*
* unless set otherwise, the session key is the user session
* key from the auth subsystem
*/
if (user_info_dc->user_session_key.length != 0) {
session_info->session_key = data_blob_dup_talloc(session_info,
user_info_dc->user_session_key);
if (session_info->session_key.data == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
}
if (!(session_info_flags & AUTH_SESSION_INFO_UNIX_TOKEN)) {
goto done;
}
session_info->unix_token = talloc_zero(session_info, struct security_unix_token);
if (session_info->unix_token == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
session_info->unix_token->uid = -1;
session_info->unix_token->gid = -1;
session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
if (session_info->unix_info == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
/* Convert the SIDs to uid/gids. */
ids = talloc_zero_array(frame, struct unixid,
session_info->security_token->num_sids);
if (ids == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
if (!(hint_flags & AUTH3_UNIX_HINT_DONT_TRANSLATE_FROM_SIDS)) {
ok = sids_to_unixids(session_info->security_token->sids,
session_info->security_token->num_sids,
ids);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
}
if (found_hint_uid) {
session_info->unix_token->uid = hint_uid;
} else if (ids[0].type == ID_TYPE_UID) {
/*
* The primary SID resolves to a UID only.
*/
session_info->unix_token->uid = ids[0].id;
} else if (ids[0].type == ID_TYPE_BOTH) {
/*
* The primary SID resolves to a UID and GID,
* use it as uid and add it as first element
* to the groups array.
*/
session_info->unix_token->uid = ids[0].id;
ok = add_gid_to_array_unique(session_info->unix_token,
session_info->unix_token->uid,
&session_info->unix_token->groups,
&session_info->unix_token->ngroups);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
} else {
/*
* It we can't get a uid, we can't imporsonate
* the user.
*/
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (found_hint_gid) {
session_info->unix_token->gid = hint_gid;
} else {
need_getpwuid = true;
}
if (hint_flags & AUTH3_UNIX_HINT_QUALIFIED_NAME) {
session_info->unix_info->unix_name =
talloc_asprintf(session_info->unix_info,
"%s%c%s",
session_info->info->domain_name,
*lp_winbind_separator(),
session_info->info->account_name);
if (session_info->unix_info->unix_name == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
} else if (hint_flags & AUTH3_UNIX_HINT_ISLOLATED_NAME) {
session_info->unix_info->unix_name =
talloc_strdup(session_info->unix_info,
session_info->info->account_name);
if (session_info->unix_info->unix_name == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
} else {
need_getpwuid = true;
}
if (need_getpwuid) {
struct passwd *pwd = NULL;
/*
* Ask the system for the primary gid
* and the real unix name.
*/
pwd = getpwuid_alloc(frame, session_info->unix_token->uid);
if (pwd == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
if (!found_hint_gid) {
session_info->unix_token->gid = pwd->pw_gid;
}
session_info->unix_info->unix_name =
talloc_strdup(session_info->unix_info, pwd->pw_name);
if (session_info->unix_info->unix_name == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
TALLOC_FREE(pwd);
}
ok = add_gid_to_array_unique(session_info->unix_token,
session_info->unix_token->gid,
&session_info->unix_token->groups,
&session_info->unix_token->ngroups);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
/* This is a potentially untrusted username for use in %U */
session_info->unix_info->sanitized_username =
talloc_alpha_strcpy(session_info->unix_info,
original_user_name,
SAFE_NETBIOS_CHARS "$");
if (session_info->unix_info->sanitized_username == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
for (i=0; i < session_info->security_token->num_sids; i++) {
if (ids[i].type != ID_TYPE_GID &&
ids[i].type != ID_TYPE_BOTH) {
struct security_token *nt_token =
session_info->security_token;
struct dom_sid_buf buf;
DEBUG(10, ("Could not convert SID %s to gid, "
"ignoring it\n",
dom_sid_str_buf(&nt_token->sids[i], &buf)));
continue;
}
ok = add_gid_to_array_unique(session_info->unix_token,
ids[i].id,
&session_info->unix_token->groups,
&session_info->unix_token->ngroups);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
}
TALLOC_FREE(ids);
/*
* Now we must get any groups this user has been
* added to in /etc/group and merge them in.
* This has to be done in every code path
* that creates an NT token, as remote users
* may have been added to the local /etc/group
* database. Tokens created merely from the
* info3 structs (via the DC or via the krb5 PAC)
* won't have these local groups. Note the
* groups added here will only be UNIX groups
* (S-1-22-2-XXXX groups) as getgroups_unix_user()
* turns off winbindd before calling getgroups().
*
* NB. This is duplicating work already
* done in the 'unix_user:' case of
* create_token_from_sid() but won't
* do anything other than be inefficient
* in that case.
*/
if (!(hint_flags & AUTH3_UNIX_HINT_DONT_EXPAND_UNIX_GROUPS)) {
ok = getgroups_unix_user(frame,
session_info->unix_info->unix_name,
session_info->unix_token->gid,
&gids, &num_gids);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_INVALID_TOKEN;
}
}
for (i=0; i < num_gids; i++) {
ok = add_gid_to_array_unique(session_info->unix_token,
gids[i],
&session_info->unix_token->groups,
&session_info->unix_token->ngroups);
if (!ok) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
}
TALLOC_FREE(gids);
if (hint_flags & AUTH3_UNIX_HINT_DONT_TRANSLATE_TO_SIDS) {
/*
* We should not translate the unix token uid/gids
* to S-1-22-X-Y SIDs.
*/
goto done;
}
/*
* Add the "Unix Group" SID for each gid to catch mapped groups
* and their Unix equivalent. This is to solve the backwards
* compatibility problem of 'valid users = +ntadmin' where
* ntadmin has been paired with "Domain Admins" in the group
* mapping table. Otherwise smb.conf would need to be changed
* to 'valid user = "Domain Admins"'. --jerry
*
* For consistency we also add the "Unix User" SID,
* so that the complete unix token is represented within
* the nt token.
*/
uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
status = add_sid_to_array_unique(session_info->security_token, &tmp_sid,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
gid_to_unix_groups_sid(session_info->unix_token->gid, &tmp_sid);
status = add_sid_to_array_unique(session_info->security_token, &tmp_sid,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
for (i=0; i < session_info->unix_token->ngroups; i++ ) {
struct security_token *nt_token = session_info->security_token;
gid_to_unix_groups_sid(session_info->unix_token->groups[i],
&tmp_sid);
status = add_sid_to_array_unique(nt_token->sids,
&tmp_sid,
&nt_token->sids,
&nt_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
}
done:
security_token_debug(DBGC_AUTH, 10, session_info->security_token);
if (session_info->unix_token != NULL) {
debug_unix_user_token(DBGC_AUTH, 10,
session_info->unix_token->uid,
session_info->unix_token->gid,
session_info->unix_token->ngroups,
session_info->unix_token->groups);
}
status = log_nt_token(session_info->security_token);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
session_info->unique_session_token = GUID_random();
*session_info_out = talloc_move(mem_ctx, &session_info);
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
/***************************************************************************
Make (and fill) a server_info struct from a 'struct passwd' by conversion
to a struct samu
***************************************************************************/
NTSTATUS make_server_info_pw(TALLOC_CTX *mem_ctx,
const char *unix_username,
const struct passwd *pwd,
struct auth_serversupplied_info **server_info)
{
NTSTATUS status;
TALLOC_CTX *tmp_ctx = NULL;
struct auth_serversupplied_info *result;
tmp_ctx = talloc_stackframe();
if (tmp_ctx == NULL) {
return NT_STATUS_NO_MEMORY;
}
result = make_server_info(tmp_ctx);
if (result == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
status = passwd_to_SamInfo3(result,
unix_username,
pwd,
&result->info3,
&result->extra);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
result->unix_name = talloc_strdup(result, unix_username);
if (result->unix_name == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
result->utok.uid = pwd->pw_uid;
result->utok.gid = pwd->pw_gid;
*server_info = talloc_move(mem_ctx, &result);
status = NT_STATUS_OK;
done:
talloc_free(tmp_ctx);
return status;
}
static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
struct netr_SamInfo3 *info3)
{
const char *guest_account = lp_guest_account();
struct dom_sid domain_sid;
struct passwd *pwd;
const char *tmp;
pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
if (pwd == NULL) {
DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
"account [%s]!\n", guest_account));
return NT_STATUS_NO_SUCH_USER;
}
/* Set account name */
tmp = talloc_strdup(mem_ctx, pwd->pw_name);
if (tmp == NULL) {
return NT_STATUS_NO_MEMORY;
}
init_lsa_String(&info3->base.account_name, tmp);
/* Set domain name */
tmp = talloc_strdup(mem_ctx, get_global_sam_name());
if (tmp == NULL) {
return NT_STATUS_NO_MEMORY;
}
init_lsa_StringLarge(&info3->base.logon_domain, tmp);
/* Domain sid */
sid_copy(&domain_sid, get_global_sam_sid());
info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
if (info3->base.domain_sid == NULL) {
return NT_STATUS_NO_MEMORY;
}
/* Guest rid */
info3->base.rid = DOMAIN_RID_GUEST;
/* Primary gid */
info3->base.primary_gid = DOMAIN_RID_GUESTS;
/* Set as guest */
info3->base.user_flags = NETLOGON_GUEST;
TALLOC_FREE(pwd);
return NT_STATUS_OK;
}
/***************************************************************************
Make (and fill) a user_info struct for a guest login.
This *must* succeed for smbd to start. If there is no mapping entry for
the guest gid, then create one.
The resulting structure is a 'session_info' because
create_local_token() has already been called on it. This is quite
nasty, as the auth subsystem isn't expect this, but the behavior is
left as-is for now.
***************************************************************************/
static NTSTATUS make_new_session_info_guest(TALLOC_CTX *mem_ctx,
struct auth_session_info **_session_info,
struct auth_serversupplied_info **_server_info)
{
struct auth_session_info *session_info = NULL;
struct auth_serversupplied_info *server_info = NULL;
const char *guest_account = lp_guest_account();
const char *domain = lp_netbios_name();
struct netr_SamInfo3 info3;
TALLOC_CTX *tmp_ctx;
NTSTATUS status;
tmp_ctx = talloc_stackframe();
if (tmp_ctx == NULL) {
return NT_STATUS_NO_MEMORY;
}
ZERO_STRUCT(info3);
status = get_guest_info3(tmp_ctx, &info3);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("get_guest_info3 failed with %s\n",
nt_errstr(status)));
goto done;
}
status = make_server_info_info3(tmp_ctx,
guest_account,
domain,
&server_info,
&info3);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("make_server_info_info3 failed with %s\n",
nt_errstr(status)));
goto done;
}
server_info->guest = true;
/* This should not be done here (we should produce a server
* info, and later construct a session info from it), but for
* now this does not change the previous behavior */
status = create_local_token(tmp_ctx, server_info, NULL,
server_info->info3->base.account_name.string,
&session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("create_local_token failed: %s\n",
nt_errstr(status)));
goto done;
}
/*
* It's ugly, but for now it's
* needed to force Builtin_Guests
* here, because memberships of
* Builtin_Guests might be incomplete.
*/
status = add_sid_to_array_unique(session_info->security_token,
&global_sid_Builtin_Guests,
&session_info->security_token->sids,
&session_info->security_token->num_sids);
if (!NT_STATUS_IS_OK(status)) {
DBG_ERR("Failed to force Builtin_Guests to nt token\n");
goto done;
}
/* annoying, but the Guest really does have a session key, and it is
all zeros! */
session_info->session_key = data_blob_talloc_zero(session_info, 16);
*_session_info = talloc_move(mem_ctx, &session_info);
*_server_info = talloc_move(mem_ctx, &server_info);
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
/***************************************************************************
Make (and fill) a auth_session_info struct for a system user login.
This *must* succeed for smbd to start.
***************************************************************************/
static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
struct auth_session_info **session_info)
{
TALLOC_CTX *frame = talloc_stackframe();
struct auth_user_info_dc *user_info_dc = NULL;
uid_t uid = -1;
gid_t gid = -1;
uint32_t hint_flags = 0;
uint32_t session_info_flags = 0;
NTSTATUS status;
status = auth_system_user_info_dc(frame, lp_netbios_name(),
&user_info_dc);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth_system_user_info_dc failed: %s\n",
nt_errstr(status)));
goto done;
}
/*
* Just get the initial uid/gid
* and don't expand the unix groups.
*/
uid = sec_initial_uid();
gid = sec_initial_gid();
hint_flags |= AUTH3_UNIX_HINT_DONT_EXPAND_UNIX_GROUPS;
/*
* Also avoid sid mapping to gids,
* as well as adding the unix_token uid/gids as
* S-1-22-X-Y SIDs to the nt token.
*/
hint_flags |= AUTH3_UNIX_HINT_DONT_TRANSLATE_FROM_SIDS;
hint_flags |= AUTH3_UNIX_HINT_DONT_TRANSLATE_TO_SIDS;
/*
* The unix name will be "NT AUTHORITY+SYSTEM",
* where '+' is the "winbind separator" character.
*/
hint_flags |= AUTH3_UNIX_HINT_QUALIFIED_NAME;
status = auth3_user_info_dc_add_hints(user_info_dc,
uid,
gid,
hint_flags);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth3_user_info_dc_add_hints failed: %s\n",
nt_errstr(status)));
goto done;
}
session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
status = auth3_session_info_create(mem_ctx, user_info_dc,
user_info_dc->info->account_name,
session_info_flags,
session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth3_session_info_create failed: %s\n",
nt_errstr(status)));
goto done;
}
done:
TALLOC_FREE(frame);
return status;
}
static NTSTATUS make_new_session_info_anonymous(TALLOC_CTX *mem_ctx,
struct auth_session_info **session_info)
{
TALLOC_CTX *frame = talloc_stackframe();
const char *guest_account = lp_guest_account();
struct auth_user_info_dc *user_info_dc = NULL;
struct passwd *pwd = NULL;
uint32_t hint_flags = 0;
uint32_t session_info_flags = 0;
NTSTATUS status;
/*
* We use the guest account for the unix token
* while we use a true anonymous nt token.
*
* It's very important to have a separate
* nt token for anonymous.
*/
pwd = Get_Pwnam_alloc(frame, guest_account);
if (pwd == NULL) {
DBG_ERR("Unable to locate guest account [%s]!\n",
guest_account);
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
status = auth_anonymous_user_info_dc(frame, lp_netbios_name(),
&user_info_dc);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth_anonymous_user_info_dc failed: %s\n",
nt_errstr(status)));
goto done;
}
/*
* Note we don't pass AUTH3_UNIX_HINT_QUALIFIED_NAME
* nor AUTH3_UNIX_HINT_ISOLATED_NAME here
* as we want the unix name be found by getpwuid_alloc().
*/
status = auth3_user_info_dc_add_hints(user_info_dc,
pwd->pw_uid,
pwd->pw_gid,
hint_flags);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth3_user_info_dc_add_hints failed: %s\n",
nt_errstr(status)));
goto done;
}
/*
* In future we may want to remove
* AUTH_SESSION_INFO_DEFAULT_GROUPS.
*
* Similar to Windows with EveryoneIncludesAnonymous
* and RestrictAnonymous.
*
* We may introduce AUTH_SESSION_INFO_ANON_WORLD...
*
* But for this is required to keep the existing tests
* working.
*/
session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
status = auth3_session_info_create(mem_ctx, user_info_dc,
"",
session_info_flags,
session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth3_session_info_create failed: %s\n",
nt_errstr(status)));
goto done;
}
done:
TALLOC_FREE(frame);
return status;
}
/****************************************************************************
Fake a auth_session_info just from a username (as a
session_info structure, with create_local_token() already called on
it.
****************************************************************************/
NTSTATUS make_session_info_from_username(TALLOC_CTX *mem_ctx,
const char *username,
bool is_guest,
struct auth_session_info **session_info)
{
struct passwd *pwd;
NTSTATUS status;
struct auth_serversupplied_info *result;
TALLOC_CTX *tmp_ctx;
tmp_ctx = talloc_stackframe();
if (tmp_ctx == NULL) {
return NT_STATUS_NO_MEMORY;
}
pwd = Get_Pwnam_alloc(tmp_ctx, username);
if (pwd == NULL) {
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
status = make_server_info_pw(tmp_ctx, pwd->pw_name, pwd, &result);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
result->nss_token = true;
result->guest = is_guest;
/* Now turn the server_info into a session_info with the full token etc */
status = create_local_token(mem_ctx,
result,
NULL,
pwd->pw_name,
session_info);
done:
talloc_free(tmp_ctx);
return status;
}
/* This function MUST only used to create the cached server_info for
* guest.
*
* This is a lossy conversion. Variables known to be lost so far
* include:
*
* - nss_token (not needed because the only read doesn't happen
* for the GUEST user, as this routine populates ->security_token
*
* - extra (not needed because the guest account must have valid RIDs per the output of get_guest_info3())
*
* - The 'server_info' parameter allows the missing 'info3' to be copied across.
*/
static struct auth_serversupplied_info *copy_session_info_serverinfo_guest(TALLOC_CTX *mem_ctx,
const struct auth_session_info *src,
struct auth_serversupplied_info *server_info)
{
struct auth_serversupplied_info *dst;
NTSTATUS status;
dst = make_server_info(mem_ctx);
if (dst == NULL) {
return NULL;
}
/* This element must be provided to convert back to an auth_serversupplied_info */
SMB_ASSERT(src->unix_info);
dst->guest = true;
/* This element must be provided to convert back to an
* auth_serversupplied_info. This needs to be from the
* auth_session_info because the group values in particular
* may change during create_local_token() processing */
SMB_ASSERT(src->unix_token);
dst->utok.uid = src->unix_token->uid;
dst->utok.gid = src->unix_token->gid;
dst->utok.ngroups = src->unix_token->ngroups;
if (src->unix_token->ngroups != 0) {
dst->utok.groups = (gid_t *)talloc_memdup(
dst, src->unix_token->groups,
sizeof(gid_t)*dst->utok.ngroups);
} else {
dst->utok.groups = NULL;
}
/* We must have a security_token as otherwise the lossy
* conversion without nss_token would cause create_local_token
* to take the wrong path */
SMB_ASSERT(src->security_token);
dst->session_key = data_blob_talloc( dst, src->session_key.data,
src->session_key.length);
/* This is OK because this functions is only used for the
* GUEST account, which has all-zero keys for both values */
dst->lm_session_key = data_blob_talloc(dst, src->session_key.data,
src->session_key.length);
status = copy_netr_SamInfo3(dst,
server_info->info3,
&dst->info3);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(dst);
return NULL;
}
dst->unix_name = talloc_strdup(dst, src->unix_info->unix_name);
if (!dst->unix_name) {
TALLOC_FREE(dst);
return NULL;
}
dst->cached_session_info = src;
return dst;
}
/*
* Set a new session key. Used in the rpc server where we have to override the
* SMB level session key with SystemLibraryDTC
*/
bool session_info_set_session_key(struct auth_session_info *info,
DATA_BLOB session_key)
{
TALLOC_FREE(info->session_key.data);
info->session_key = data_blob_talloc(
info, session_key.data, session_key.length);
return (info->session_key.data != NULL);
}
static struct auth_session_info *guest_info = NULL;
static struct auth_session_info *anonymous_info = NULL;
static struct auth_serversupplied_info *guest_server_info = NULL;
bool init_guest_session_info(TALLOC_CTX *mem_ctx)
{
NTSTATUS status;
if (guest_info != NULL)
return true;
status = make_new_session_info_guest(mem_ctx,
&guest_info,
&guest_server_info);
if (!NT_STATUS_IS_OK(status)) {
return false;
}
status = make_new_session_info_anonymous(mem_ctx,
&anonymous_info);
if (!NT_STATUS_IS_OK(status)) {
return false;
}
return true;
}
bool reinit_guest_session_info(TALLOC_CTX *mem_ctx)
{
TALLOC_FREE(guest_info);
TALLOC_FREE(guest_server_info);
TALLOC_FREE(anonymous_info);
DBG_DEBUG("Reinitialing guest info\n");
return init_guest_session_info(mem_ctx);
}
NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
struct auth_serversupplied_info **server_info)
{
/* This is trickier than it would appear to need to be because
* we are trying to avoid certain costly operations when the
* structure is converted to a 'auth_session_info' again in
* create_local_token() */
*server_info = copy_session_info_serverinfo_guest(mem_ctx, guest_info, guest_server_info);
return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}
NTSTATUS make_session_info_guest(TALLOC_CTX *mem_ctx,
struct auth_session_info **session_info)
{
*session_info = copy_session_info(mem_ctx, guest_info);
return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}
NTSTATUS make_server_info_anonymous(TALLOC_CTX *mem_ctx,
struct auth_serversupplied_info **server_info)
{
if (anonymous_info == NULL) {
return NT_STATUS_UNSUCCESSFUL;
}
/*
* This is trickier than it would appear to need to be because
* we are trying to avoid certain costly operations when the
* structure is converted to a 'auth_session_info' again in
* create_local_token()
*
* We use a guest server_info, but with the anonymous session info,
* which means create_local_token() will return a copy
* of the anonymous token.
*
* The server info is just used as legacy in order to
* keep existing code working. Maybe some debug messages
* will still refer to guest instead of anonymous.
*/
*server_info = copy_session_info_serverinfo_guest(mem_ctx, anonymous_info,
guest_server_info);
if (*server_info == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
NTSTATUS make_session_info_anonymous(TALLOC_CTX *mem_ctx,
struct auth_session_info **session_info)
{
if (anonymous_info == NULL) {
return NT_STATUS_UNSUCCESSFUL;
}
*session_info = copy_session_info(mem_ctx, anonymous_info);
if (*session_info == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
static struct auth_session_info *system_info = NULL;
NTSTATUS init_system_session_info(TALLOC_CTX *mem_ctx)
{
if (system_info != NULL)
return NT_STATUS_OK;
return make_new_session_info_system(mem_ctx, &system_info);
}
NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
struct auth_session_info **session_info)
{
if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
*session_info = copy_session_info(mem_ctx, system_info);
return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}
const struct auth_session_info *get_session_info_system(void)
{
return system_info;
}
/***************************************************************************
Purely internal function for make_server_info_info3
***************************************************************************/
static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
const char *username,
const struct dom_sid *sid,
char **found_username,
struct passwd **pwd,
bool *username_was_mapped)
{
char *orig_dom_user = NULL;
char *dom_user = NULL;
char *lower_username = NULL;
char *real_username = NULL;
struct passwd *passwd;
lower_username = talloc_strdup(mem_ctx, username);
if (!lower_username) {
return NT_STATUS_NO_MEMORY;
}
if (!strlower_m( lower_username )) {
return NT_STATUS_INVALID_PARAMETER;
}
orig_dom_user = talloc_asprintf(mem_ctx,
"%s%c%s",
domain,
*lp_winbind_separator(),
lower_username);
if (!orig_dom_user) {
return NT_STATUS_NO_MEMORY;
}
/* Get the passwd struct. Try to create the account if necessary. */
*username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
if (!dom_user) {
return NT_STATUS_NO_MEMORY;
}
passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, false);
if (!passwd && !*username_was_mapped) {
struct dom_sid_buf buf;
uid_t uid;
bool ok;
DBG_DEBUG("Failed to find authenticated user %s via "
"getpwnam(), fallback to sid_to_uid(%s).\n",
dom_user, dom_sid_str_buf(sid, &buf));
ok = sid_to_uid(sid, &uid);
if (!ok) {
DBG_ERR("Failed to convert SID %s to a UID (dom_user[%s])\n",
dom_sid_str_buf(sid, &buf), dom_user);
return NT_STATUS_NO_SUCH_USER;
}
passwd = getpwuid_alloc(mem_ctx, uid);
if (!passwd) {
DBG_ERR("Failed to find local account with UID %lld for SID %s (dom_user[%s])\n",
(long long)uid,
dom_sid_str_buf(sid, &buf),
dom_user);
return NT_STATUS_NO_SUCH_USER;
}
real_username = talloc_strdup(mem_ctx, passwd->pw_name);
}
if (!passwd) {
DEBUG(3, ("Failed to find authenticated user %s via "
"getpwnam(), denying access.\n", dom_user));
return NT_STATUS_NO_SUCH_USER;
}
if (!real_username) {
return NT_STATUS_NO_MEMORY;
}
*pwd = passwd;
/* This is pointless -- there is no support for differing
unix and windows names. Make sure to always store the
one we actually looked up and succeeded. Have I mentioned
why I hate the 'winbind use default domain' parameter?
--jerry */
*found_username = talloc_strdup( mem_ctx, real_username );
return NT_STATUS_OK;
}
/****************************************************************************
Wrapper to allow the getpwnam() call to strip the domain name and
try again in case a local UNIX user is already there. Also run through
the username if we fallback to the username only.
****************************************************************************/
struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
char **p_save_username, bool create )
{
struct passwd *pw = NULL;
char *p = NULL;
const char *username = NULL;
/* we only save a copy of the username it has been mangled
by winbindd use default domain */
*p_save_username = NULL;
/* don't call map_username() here since it has to be done higher
up the stack so we don't call it multiple times */
username = talloc_strdup(mem_ctx, domuser);
if (!username) {
return NULL;
}
p = strchr_m( username, *lp_winbind_separator() );
/* code for a DOMAIN\user string */
if ( p ) {
const char *domain = NULL;
/* split the domain and username into 2 strings */
*p = '\0';
domain = username;
p++;
username = p;
if (strequal(domain, get_global_sam_name())) {
/*
* This typically don't happen
* as check_sam_Security()
* don't call make_server_info_info3()
* and thus check_account().
*
* But we better keep this.
*/
goto username_only;
}
pw = Get_Pwnam_alloc( mem_ctx, domuser );
if (pw == NULL) {
return NULL;
}
/* make sure we get the case of the username correct */
/* work around 'winbind use default domain = yes' */
if ( lp_winbind_use_default_domain() &&
!strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
*p_save_username = talloc_asprintf(mem_ctx,
"%s%c%s",
domain,
*lp_winbind_separator(),
pw->pw_name);
if (!*p_save_username) {
TALLOC_FREE(pw);
return NULL;
}
} else {
*p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
}
/* whew -- done! */
return pw;
}
/* just lookup a plain username */
username_only:
pw = Get_Pwnam_alloc(mem_ctx, username);
/* Create local user if requested but only if winbindd
is not running. We need to protect against cases
where winbindd is failing and then prematurely
creating users in /etc/passwd */
if ( !pw && create && !winbind_ping() ) {
/* Don't add a machine account. */
if (username[strlen(username)-1] == '$')
return NULL;
_smb_create_user(NULL, username, NULL);
pw = Get_Pwnam_alloc(mem_ctx, username);
}
/* one last check for a valid passwd struct */
if (pw) {
*p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
}
return pw;
}
/***************************************************************************
Make a server_info struct from the info3 returned by a domain logon
***************************************************************************/
NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
const char *sent_nt_username,
const char *domain,
struct auth_serversupplied_info **server_info,
const struct netr_SamInfo3 *info3)
{
NTSTATUS nt_status;
char *found_username = NULL;
const char *nt_domain;
const char *nt_username;
struct dom_sid user_sid;
struct dom_sid group_sid;
bool username_was_mapped;
struct passwd *pwd;
struct auth_serversupplied_info *result;
struct dom_sid sid;
TALLOC_CTX *tmp_ctx = talloc_stackframe();
/*
Here is where we should check the list of
trusted domains, and verify that the SID
matches.
*/
if (!sid_compose(&user_sid, info3->base.domain_sid, info3->base.rid)) {
nt_status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
if (!sid_compose(&group_sid, info3->base.domain_sid,
info3->base.primary_gid)) {
nt_status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
nt_username = talloc_strdup(tmp_ctx, info3->base.account_name.string);
if (!nt_username) {
/* If the server didn't give us one, just use the one we sent
* them */
nt_username = sent_nt_username;
}
nt_domain = talloc_strdup(mem_ctx, info3->base.logon_domain.string);
if (!nt_domain) {
/* If the server didn't give us one, just use the one we sent
* them */
nt_domain = domain;
}
/* If getpwnam() fails try the add user script (2.2.x behavior).
We use the _unmapped_ username here in an attempt to provide
consistent username mapping behavior between kerberos and NTLM[SSP]
authentication in domain mode security. I.E. Username mapping
should be applied to the fully qualified username
(e.g. DOMAIN\user) and not just the login name. Yes this means we
called map_username() unnecessarily in make_user_info_map() but
that is how the current code is designed. Making the change here
is the least disruptive place. -- jerry */
/* this call will try to create the user if necessary */
sid_copy(&sid, info3->base.domain_sid);
sid_append_rid(&sid, info3->base.rid);
nt_status = check_account(tmp_ctx,
nt_domain,
nt_username,
&sid,
&found_username,
&pwd,
&username_was_mapped);
if (!NT_STATUS_IS_OK(nt_status)) {
/* Handle 'map to guest = Bad Uid */
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) &&
(lp_security() == SEC_ADS || lp_security() == SEC_DOMAIN) &&
lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID) {
DBG_NOTICE("Try to map %s to guest account\n",
nt_username);
nt_status = make_server_info_guest(tmp_ctx, &result);
if (NT_STATUS_IS_OK(nt_status)) {
*server_info = talloc_move(mem_ctx, &result);
}
}
goto out;
} else if ((lp_security() == SEC_ADS || lp_security() == SEC_DOMAIN) &&
!is_myname(domain) && pwd->pw_uid < lp_min_domain_uid()) {
/*
* !is_myname(domain) because when smbd starts tries to setup
* the guest user info, calling this function with nobody
* username. Nobody is usually uid 65535 but it can be changed
* to a regular user with 'guest account' parameter
*/
nt_status = NT_STATUS_INVALID_TOKEN;
DBG_NOTICE("Username '%s%s%s' is invalid on this system, "
"it does not meet 'min domain uid' "
"restriction (%u < %u): %s\n",
nt_domain, lp_winbind_separator(), nt_username,
pwd->pw_uid, lp_min_domain_uid(),
nt_errstr(nt_status));
goto out;
}
result = make_server_info(tmp_ctx);
if (result == NULL) {
DEBUG(4, ("make_server_info failed!\n"));
nt_status = NT_STATUS_NO_MEMORY;
goto out;
}
result->unix_name = talloc_strdup(result, found_username);
/* copy in the info3 */
nt_status = copy_netr_SamInfo3(result,
info3,
&result->info3);
if (!NT_STATUS_IS_OK(nt_status)) {
goto out;
}
/* Fill in the unix info we found on the way */
result->utok.uid = pwd->pw_uid;
result->utok.gid = pwd->pw_gid;
/* ensure we are never given NULL session keys */
if (all_zero(info3->base.key.key, sizeof(info3->base.key.key))) {
result->session_key = data_blob_null;
} else {
result->session_key = data_blob_talloc(
result, info3->base.key.key,
sizeof(info3->base.key.key));
}
if (all_zero(info3->base.LMSessKey.key,
sizeof(info3->base.LMSessKey.key))) {
result->lm_session_key = data_blob_null;
} else {
result->lm_session_key = data_blob_talloc(
result, info3->base.LMSessKey.key,
sizeof(info3->base.LMSessKey.key));
}
result->nss_token |= username_was_mapped;
result->guest = (info3->base.user_flags & NETLOGON_GUEST);
*server_info = talloc_move(mem_ctx, &result);
nt_status = NT_STATUS_OK;
out:
talloc_free(tmp_ctx);
return nt_status;
}
/*****************************************************************************
Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
******************************************************************************/
NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
const char *sent_nt_username,
const char *domain,
const struct wbcAuthUserInfo *info,
struct auth_serversupplied_info **server_info)
{
struct netr_SamInfo3 info3;
struct netr_SamInfo6 *info6;
info6 = wbcAuthUserInfo_to_netr_SamInfo6(mem_ctx, info);
if (!info6) {
return NT_STATUS_NO_MEMORY;
}
info3.base = info6->base;
info3.sidcount = info6->sidcount;
info3.sids = info6->sids;
return make_server_info_info3(mem_ctx,
sent_nt_username, domain,
server_info, &info3);
}
/**
* Verify whether or not given domain is trusted.
*
* This should only be used on a DC.
*
* @param domain_name name of the domain to be verified
* @return true if domain is one of the trusted ones or
* false if otherwise
**/
bool is_trusted_domain(const char* dom_name)
{
bool ret;
if (!IS_DC) {
return false;
}
if (dom_name == NULL || dom_name[0] == '\0') {
return false;
}
if (strequal(dom_name, get_global_sam_name())) {
return false;
}
become_root();
DEBUG (5,("is_trusted_domain: Checking for domain trust with "
"[%s]\n", dom_name ));
ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
unbecome_root();
return ret;
}
/*
on a logon error possibly map the error to success if "map to guest"
is set appropriately
*/
NTSTATUS do_map_to_guest_server_info(TALLOC_CTX *mem_ctx,
NTSTATUS status,
const char *user,
const char *domain,
struct auth_serversupplied_info **server_info)
{
user = user ? user : "";
domain = domain ? domain : "";
if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
(lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
DEBUG(3,("No such user %s [%s] - using guest account\n",
user, domain));
return make_server_info_guest(mem_ctx, server_info);
}
} else if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
DEBUG(3,("Registered username %s for guest access\n",
user));
return make_server_info_guest(mem_ctx, server_info);
}
}
return status;
}
/*
Extract session key from a session info and return it in a blob
if intent is KEY_USE_16BYTES, truncate it to 16 bytes
See sections 3.2.4.15 and 3.3.4.2 of MS-SMB
Also see https://lists.samba.org/archive/cifs-protocol/2012-January/002265.html for details
Note that returned session_key is referencing the original key, it is supposed to be
short-lived. If original session_info->session_key is gone, the reference will be broken.
*/
NTSTATUS session_extract_session_key(const struct auth_session_info *session_info, DATA_BLOB *session_key, enum session_key_use_intent intent)
{
if (session_key == NULL || session_info == NULL) {
return NT_STATUS_INVALID_PARAMETER;
}
if (session_info->session_key.length == 0) {
return NT_STATUS_NO_USER_SESSION_KEY;
}
*session_key = session_info->session_key;
if (intent == KEY_USE_16BYTES) {
session_key->length = MIN(session_info->session_key.length, 16);
}
return NT_STATUS_OK;
}