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samba-mirror/source4/auth/ntlm/auth_util.c
Andrew Tridgell 71f3a25ff7 s4-auth: rework map_user_info() to use cracknames 
to properly support multi-domain forests we need to determine if an
incoming username is part of a known forest domain or not. To do this
for all possible SPN forms, we need to use CrackNames.

This changes map_user_info() to use CrackNames if a SAM context is
available, and asks the CrackNames services to parse the incoming
username and domain into a NT4 form, which can then be used in the
SAM.

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
2011-10-04 15:08:57 +11:00

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/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001
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/auth/libcli_auth.h"
#include "param/param.h"
#include "auth/ntlm/auth_proto.h"
#include "librpc/gen_ndr/drsuapi.h"
#include "dsdb/samdb/samdb.h"
/* this default function can be used by mostly all backends
* which don't want to set a challenge
*/
NTSTATUS auth_get_challenge_not_implemented(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, uint8_t chal[8])
{
/* we don't want to set a challenge */
return NT_STATUS_NOT_IMPLEMENTED;
}
/****************************************************************************
Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/
static NTSTATUS map_user_info_cracknames(struct ldb_context *sam_ctx,
TALLOC_CTX *mem_ctx,
const char *default_domain,
const struct auth_usersupplied_info *user_info,
struct auth_usersupplied_info **user_info_mapped)
{
char *domain;
char *account_name;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
WERROR werr;
struct drsuapi_DsNameInfo1 info1;
DEBUG(5,("map_user_info_cracknames: Mapping user [%s]\\[%s] from workstation [%s]\n",
user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
account_name = talloc_strdup(tmp_ctx, user_info->client.account_name);
if (!account_name) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* use cracknames to work out what domain is being
asked for */
if (strchr_m(user_info->client.account_name, '@') != NULL) {
werr = DsCrackNameOneName(sam_ctx, tmp_ctx, 0,
DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL,
DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT,
user_info->client.account_name,
&info1);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(2,("map_user_info: Failed cracknames of account '%s'\n",
user_info->client.account_name));
talloc_free(tmp_ctx);
return werror_to_ntstatus(werr);
}
switch (info1.status) {
case DRSUAPI_DS_NAME_STATUS_OK:
break;
case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> NOT_FOUND\n",
user_info->client.account_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> DOMAIN_ONLY\n",
user_info->client.account_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> NOT_UNIQUE\n",
user_info->client.account_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> RESOLVE_ERROR\n",
user_info->client.account_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
default:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> unknown error %u\n",
user_info->client.account_name, info1.status));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
}
/* info1.result_name is in DOMAIN\username
* form, which we need to split up into the
* user_info_mapped structure
*/
domain = talloc_strdup(tmp_ctx, info1.result_name);
if (domain == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
account_name = strchr_m(domain, '\\');
if (account_name == NULL) {
DEBUG(2,("map_user_info: Cracknames of account '%s' gave invalid result '%s'\n",
user_info->client.account_name, info1.result_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
}
*account_name = 0;
account_name = talloc_strdup(tmp_ctx, account_name+1);
if (account_name == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
} else {
char *domain_name;
if (user_info->client.domain_name && *user_info->client.domain_name) {
domain_name = talloc_asprintf(tmp_ctx, "%s\\", user_info->client.domain_name);
} else {
domain_name = talloc_strdup(tmp_ctx, default_domain);
}
if (domain_name == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
werr = DsCrackNameOneName(sam_ctx, mem_ctx, 0,
DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT,
DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT,
domain_name,
&info1);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(2,("map_user_info: Failed cracknames of domain '%s'\n",
domain_name));
talloc_free(tmp_ctx);
return werror_to_ntstatus(werr);
}
/* we use the account_name as-is, but get the
* domain name from cracknames if possible */
account_name = talloc_strdup(mem_ctx, user_info->client.account_name);
if (account_name == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
switch (info1.status) {
case DRSUAPI_DS_NAME_STATUS_OK:
case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
domain = talloc_strdup(tmp_ctx, info1.result_name);
if (domain == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
if (domain[strlen_m(domain)-1] == '\\') {
domain[strlen_m(domain)-1] = 0;
}
break;
case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
/* the domain is unknown - use the
default domain */
domain = talloc_strdup(tmp_ctx, default_domain);
break;
case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
DEBUG(2,("map_user_info: Cracknames of domain '%s' -> NOT_UNIQUE\n",
domain_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
DEBUG(2,("map_user_info: Cracknames of domain '%s' -> RESOLVE_ERROR\n",
domain_name));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
default:
DEBUG(2,("map_user_info: Cracknames of account '%s' -> unknown error %u\n",
domain_name, info1.status));
talloc_free(tmp_ctx);
return NT_STATUS_NO_SUCH_USER;
}
/* domain and account_name are filled in above */
}
*user_info_mapped = talloc_zero(mem_ctx, struct auth_usersupplied_info);
if (!*user_info_mapped) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
if (!talloc_reference(*user_info_mapped, user_info)) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
**user_info_mapped = *user_info;
(*user_info_mapped)->mapped_state = true;
(*user_info_mapped)->mapped.domain_name = talloc_strdup(*user_info_mapped, domain);
(*user_info_mapped)->mapped.account_name = talloc_strdup(*user_info_mapped, account_name);
talloc_free(tmp_ctx);
if (!(*user_info_mapped)->mapped.domain_name
|| !(*user_info_mapped)->mapped.account_name) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
/****************************************************************************
Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/
NTSTATUS map_user_info(struct ldb_context *sam_ctx,
TALLOC_CTX *mem_ctx,
const char *default_domain,
const struct auth_usersupplied_info *user_info,
struct auth_usersupplied_info **user_info_mapped)
{
char *domain;
char *account_name;
char *d;
TALLOC_CTX *tmp_ctx;
if (sam_ctx != NULL) {
/* if possible, use cracknames to parse the
domain/account */
return map_user_info_cracknames(sam_ctx, mem_ctx, default_domain, user_info, user_info_mapped);
}
DEBUG(0,("map_user_info: Mapping user [%s]\\[%s] from workstation [%s] default_domain=%s\n",
user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name,
default_domain));
tmp_ctx = talloc_new(mem_ctx);
account_name = talloc_strdup(tmp_ctx, user_info->client.account_name);
if (!account_name) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* don't allow "" as a domain, fixes a Win9X bug where it
doesn't supply a domain for logon script 'net use'
commands. */
/* Split user@realm names into user and realm components.
* This is TODO to fix with proper userprincipalname
* support */
if (user_info->client.domain_name && *user_info->client.domain_name) {
domain = talloc_strdup(tmp_ctx, user_info->client.domain_name);
} else if (strchr_m(user_info->client.account_name, '@')) {
d = strchr_m(account_name, '@');
if (!d) {
talloc_free(tmp_ctx);
return NT_STATUS_INTERNAL_ERROR;
}
d[0] = '\0';
d++;
domain = d;
} else {
domain = talloc_strdup(tmp_ctx, default_domain);
}
if (domain == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
*user_info_mapped = talloc_zero(mem_ctx, struct auth_usersupplied_info);
if (!*user_info_mapped) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
if (!talloc_reference(*user_info_mapped, user_info)) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
**user_info_mapped = *user_info;
(*user_info_mapped)->mapped_state = true;
(*user_info_mapped)->mapped.domain_name = talloc_strdup(*user_info_mapped, domain);
(*user_info_mapped)->mapped.account_name = talloc_strdup(*user_info_mapped, account_name);
talloc_free(tmp_ctx);
if (!(*user_info_mapped)->mapped.domain_name
|| !(*user_info_mapped)->mapped.account_name) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
/****************************************************************************
Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/
NTSTATUS encrypt_user_info(TALLOC_CTX *mem_ctx, struct auth4_context *auth_context,
enum auth_password_state to_state,
const struct auth_usersupplied_info *user_info_in,
const struct auth_usersupplied_info **user_info_encrypted)
{
NTSTATUS nt_status;
struct auth_usersupplied_info *user_info_temp;
switch (to_state) {
case AUTH_PASSWORD_RESPONSE:
switch (user_info_in->password_state) {
case AUTH_PASSWORD_PLAIN:
{
const struct auth_usersupplied_info *user_info_temp2;
nt_status = encrypt_user_info(mem_ctx, auth_context,
AUTH_PASSWORD_HASH,
user_info_in, &user_info_temp2);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
user_info_in = user_info_temp2;
/* fall through */
}
case AUTH_PASSWORD_HASH:
{
uint8_t chal[8];
DATA_BLOB chall_blob;
user_info_temp = talloc_zero(mem_ctx, struct auth_usersupplied_info);
if (!user_info_temp) {
return NT_STATUS_NO_MEMORY;
}
if (!talloc_reference(user_info_temp, user_info_in)) {
return NT_STATUS_NO_MEMORY;
}
*user_info_temp = *user_info_in;
user_info_temp->mapped_state = to_state;
nt_status = auth_get_challenge(auth_context, chal);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
chall_blob = data_blob_talloc(mem_ctx, chal, 8);
if (lpcfg_client_ntlmv2_auth(auth_context->lp_ctx)) {
DATA_BLOB names_blob = NTLMv2_generate_names_blob(mem_ctx, lpcfg_netbios_name(auth_context->lp_ctx), lpcfg_workgroup(auth_context->lp_ctx));
DATA_BLOB lmv2_response, ntlmv2_response, lmv2_session_key, ntlmv2_session_key;
if (!SMBNTLMv2encrypt_hash(user_info_temp,
user_info_in->client.account_name,
user_info_in->client.domain_name,
user_info_in->password.hash.nt->hash, &chall_blob,
&names_blob,
&lmv2_response, &ntlmv2_response,
&lmv2_session_key, &ntlmv2_session_key)) {
data_blob_free(&names_blob);
return NT_STATUS_NO_MEMORY;
}
data_blob_free(&names_blob);
user_info_temp->password.response.lanman = lmv2_response;
user_info_temp->password.response.nt = ntlmv2_response;
data_blob_free(&lmv2_session_key);
data_blob_free(&ntlmv2_session_key);
} else {
DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
SMBOWFencrypt(user_info_in->password.hash.nt->hash, chal, blob.data);
user_info_temp->password.response.nt = blob;
if (lpcfg_client_lanman_auth(auth_context->lp_ctx) && user_info_in->password.hash.lanman) {
DATA_BLOB lm_blob = data_blob_talloc(mem_ctx, NULL, 24);
SMBOWFencrypt(user_info_in->password.hash.lanman->hash, chal, blob.data);
user_info_temp->password.response.lanman = lm_blob;
} else {
/* if not sending the LM password, send the NT password twice */
user_info_temp->password.response.lanman = user_info_temp->password.response.nt;
}
}
user_info_in = user_info_temp;
/* fall through */
}
case AUTH_PASSWORD_RESPONSE:
*user_info_encrypted = user_info_in;
}
break;
case AUTH_PASSWORD_HASH:
{
switch (user_info_in->password_state) {
case AUTH_PASSWORD_PLAIN:
{
struct samr_Password lanman;
struct samr_Password nt;
user_info_temp = talloc_zero(mem_ctx, struct auth_usersupplied_info);
if (!user_info_temp) {
return NT_STATUS_NO_MEMORY;
}
if (!talloc_reference(user_info_temp, user_info_in)) {
return NT_STATUS_NO_MEMORY;
}
*user_info_temp = *user_info_in;
user_info_temp->mapped_state = to_state;
if (E_deshash(user_info_in->password.plaintext, lanman.hash)) {
user_info_temp->password.hash.lanman = talloc(user_info_temp,
struct samr_Password);
*user_info_temp->password.hash.lanman = lanman;
} else {
user_info_temp->password.hash.lanman = NULL;
}
E_md4hash(user_info_in->password.plaintext, nt.hash);
user_info_temp->password.hash.nt = talloc(user_info_temp,
struct samr_Password);
*user_info_temp->password.hash.nt = nt;
user_info_in = user_info_temp;
/* fall through */
}
case AUTH_PASSWORD_HASH:
*user_info_encrypted = user_info_in;
break;
default:
return NT_STATUS_INVALID_PARAMETER;
break;
}
break;
}
default:
return NT_STATUS_INVALID_PARAMETER;
}
return NT_STATUS_OK;
}
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