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/*
Unix SMB/CIFS implementation.
Authenticate a user
Copyright (C) Volker Lendecke 2005
Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 "libcli/composite/composite.h"
#include "winbind/wb_server.h"
#include "smbd/service_task.h"
#include "auth/credentials/credentials.h"
#include "libcli/auth/libcli_auth.h"
#include "librpc/gen_ndr/ndr_netlogon.h"
#include "librpc/gen_ndr/ndr_netlogon_c.h"
/* Oh, there is so much to keep an eye on when authenticating a user. Oh my! */
struct pam_auth_crap_state {
struct composite_context *ctx;
struct event_context *event_ctx;
uint32_t logon_parameters;
const char *domain_name;
const char *user_name;
char *unix_username;
const char *workstation;
DATA_BLOB chal, nt_resp, lm_resp;
struct creds_CredentialState *creds_state;
struct netr_Authenticator auth, auth2;
struct netr_NetworkInfo ninfo;
struct netr_LogonSamLogon r;
struct netr_UserSessionKey user_session_key;
struct netr_LMSessionKey lm_key;
DATA_BLOB info3;
};
/*
* NTLM authentication.
*/
static void pam_auth_crap_recv_domain(struct composite_context *ctx);
static void pam_auth_crap_recv_samlogon(struct rpc_request *req);
struct composite_context *wb_cmd_pam_auth_crap_send(TALLOC_CTX *mem_ctx,
struct wbsrv_service *service,
uint32_t logon_parameters,
const char *domain,
const char *user,
const char *workstation,
DATA_BLOB chal,
DATA_BLOB nt_resp,
DATA_BLOB lm_resp)
{
struct composite_context *result, *ctx;
struct pam_auth_crap_state *state;
result = composite_create(mem_ctx, service->task->event_ctx);
if (result == NULL) goto failed;
state = talloc(result, struct pam_auth_crap_state);
if (state == NULL) goto failed;
state->ctx = result;
result->private_data = state;
state->logon_parameters = logon_parameters;
state->domain_name = talloc_strdup(state, domain);
if (state->domain_name == NULL) goto failed;
state->user_name = talloc_strdup(state, user);
if (state->user_name == NULL) goto failed;
state->unix_username = NULL;
state->workstation = talloc_strdup(state, workstation);
if (state->workstation == NULL) goto failed;
state->chal = data_blob_talloc(state, chal.data, chal.length);
if ((chal.data != NULL) && (state->chal.data == NULL)) goto failed;
state->nt_resp = data_blob_talloc(state, nt_resp.data, nt_resp.length);
if ((nt_resp.data != NULL) &&
(state->nt_resp.data == NULL)) goto failed;
state->lm_resp = data_blob_talloc(state, lm_resp.data, lm_resp.length);
if ((lm_resp.data != NULL) &&
(state->lm_resp.data == NULL)) goto failed;
ctx = wb_sid2domain_send(state, service, service->primary_sid);
if (ctx == NULL) goto failed;
ctx->async.fn = pam_auth_crap_recv_domain;
ctx->async.private_data = state;
return result;
failed:
talloc_free(result);
return NULL;
}
/*
NTLM Authentication
Send of a SamLogon request to authenticate a user.
*/
static void pam_auth_crap_recv_domain(struct composite_context *ctx)
{
struct pam_auth_crap_state *state =
talloc_get_type(ctx->async.private_data,
struct pam_auth_crap_state);
struct rpc_request *req;
struct wbsrv_domain *domain;
state->ctx->status = wb_sid2domain_recv(ctx, &domain);
state->creds_state =
cli_credentials_get_netlogon_creds(domain->schannel_creds);
creds_client_authenticator(state->creds_state, &state->auth);
state->ninfo.identity_info.account_name.string = state->user_name;
state->ninfo.identity_info.domain_name.string = state->domain_name;
state->ninfo.identity_info.parameter_control = state->logon_parameters;
state->ninfo.identity_info.logon_id_low = 0;
state->ninfo.identity_info.logon_id_high = 0;
state->ninfo.identity_info.workstation.string = state->workstation;
SMB_ASSERT(state->chal.length == sizeof(state->ninfo.challenge));
memcpy(state->ninfo.challenge, state->chal.data,
sizeof(state->ninfo.challenge));
state->ninfo.nt.length = state->nt_resp.length;
state->ninfo.nt.data = state->nt_resp.data;
state->ninfo.lm.length = state->lm_resp.length;
state->ninfo.lm.data = state->lm_resp.data;
state->r.in.server_name = talloc_asprintf(
state, "\\\\%s", dcerpc_server_name(domain->netlogon_pipe));
if (composite_nomem(state->r.in.server_name, state->ctx)) return;
ZERO_STRUCT(state->auth2);
state->r.in.computer_name =
cli_credentials_get_workstation(domain->schannel_creds);
state->r.in.credential = &state->auth;
state->r.in.return_authenticator = &state->auth2;
state->r.in.logon_level = 2;
state->r.in.validation_level = 3;
state->r.in.logon.network = &state->ninfo;
state->r.out.return_authenticator = NULL;
req = dcerpc_netr_LogonSamLogon_send(domain->netlogon_pipe, state,
&state->r);
composite_continue_rpc(state->ctx, req, pam_auth_crap_recv_samlogon,
state);
}
/*
NTLM Authentication
Check the SamLogon reply, decrypt and parse out the session keys and the
info3 structure.
*/
static void pam_auth_crap_recv_samlogon(struct rpc_request *req)
{
struct pam_auth_crap_state *state =
talloc_get_type(req->async.private_data,
struct pam_auth_crap_state);
struct netr_SamBaseInfo *base;
DATA_BLOB tmp_blob;
state->ctx->status = dcerpc_ndr_request_recv(req);
if (!composite_is_ok(state->ctx)) return;
if ((state->r.out.return_authenticator == NULL) ||
(!creds_client_check(state->creds_state,
&state->r.out.return_authenticator->cred))) {
DEBUG(0, ("Credentials check failed!\n"));
composite_error(state->ctx, NT_STATUS_ACCESS_DENIED);
return;
}
state->ctx->status = state->r.out.result;
if (!composite_is_ok(state->ctx)) return;
/* Decrypt the session keys before we reform the info3, so the
* person on the other end of winbindd pipe doesn't have to.
* They won't have the encryption key anyway */
creds_decrypt_samlogon(state->creds_state,
state->r.in.validation_level,
&state->r.out.validation);
state->ctx->status = ndr_push_struct_blob(
&tmp_blob, state, state->r.out.validation.sam3,
(ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
if (!composite_is_ok(state->ctx)) return;
/* The Samba3 protocol is a bit broken (due to non-IDL
* heritage, so for compatability we must add a non-zero 4
* bytes to the info3 */
state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4);
if (composite_nomem(state->info3.data, state->ctx)) return;
SIVAL(state->info3.data, 0, 1);
memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length);
/* We actually only ask for level 3, and assume it above, but
* anyway... */
base = NULL;
switch(state->r.in.validation_level) {
case 2:
base = &state->r.out.validation.sam2->base;
break;
case 3:
base = &state->r.out.validation.sam3->base;
break;
case 6:
base = &state->r.out.validation.sam6->base;
break;
}
if (base == NULL) {
composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
return;
}
state->user_session_key = base->key;
state->lm_key = base->LMSessKey;
/* Give the caller the most accurate username possible.
* Assists where case sensitive comparisons may be done by our
* ntlm_auth callers */
if (base->account_name.string) {
state->user_name = base->account_name.string;
talloc_steal(state, base->account_name.string);
}
if (base->domain.string) {
state->domain_name = base->domain.string;
talloc_steal(state, base->domain.string);
}
state->unix_username = talloc_asprintf(state, "%s%s%s",
state->domain_name,
lp_winbind_separator(),
state->user_name);
if (composite_nomem(state->unix_username, state->ctx)) return;
composite_done(state->ctx);
}
/* Having received a NTLM authentication reply, parse out the useful
* reply data for the caller */
NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c,
TALLOC_CTX *mem_ctx,
DATA_BLOB *info3,
struct netr_UserSessionKey *user_session_key,
struct netr_LMSessionKey *lm_key,
char **unix_username)
{
struct pam_auth_crap_state *state =
talloc_get_type(c->private_data, struct pam_auth_crap_state);
NTSTATUS status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
info3->length = state->info3.length;
info3->data = talloc_steal(mem_ctx, state->info3.data);
*user_session_key = state->user_session_key;
*lm_key = state->lm_key;
*unix_username = talloc_steal(mem_ctx, state->unix_username);
}
talloc_free(state);
return status;
}
/* Handle plaintext authentication, by encrypting the password and
* then sending via the NTLM calls */
struct composite_context *wb_cmd_pam_auth_send(TALLOC_CTX *mem_ctx,
struct wbsrv_service *service,
const char *domain,
const char *user,
const char *password)
{
struct cli_credentials *credentials;
const char *workstation;
NTSTATUS status;
DATA_BLOB chal, nt_resp, lm_resp, names_blob;
int flags = CLI_CRED_NTLM_AUTH;
if (lp_client_lanman_auth()) {
flags |= CLI_CRED_LANMAN_AUTH;
}
if (lp_client_ntlmv2_auth()) {
flags |= CLI_CRED_NTLMv2_AUTH;
}
DEBUG(5, ("wbsrv_samba3_pam_auth called\n"));
credentials = cli_credentials_init(mem_ctx);
if (!credentials) {
return NULL;
}
cli_credentials_set_conf(credentials);
cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
cli_credentials_set_password(credentials, password, CRED_SPECIFIED);
chal = data_blob_talloc(mem_ctx, NULL, 8);
if (!chal.data) {
return NULL;
}
generate_random_buffer(chal.data, chal.length);
cli_credentials_get_ntlm_username_domain(credentials, mem_ctx,
&user, &domain);
/* for best compatability with multiple vitual netbios names
* on the host, this should be generated from the
* cli_credentials associated with the machine account */
workstation = cli_credentials_get_workstation(credentials);
names_blob = NTLMv2_generate_names_blob(
mem_ctx,
cli_credentials_get_workstation(credentials),
cli_credentials_get_domain(credentials));
status = cli_credentials_get_ntlm_response(
credentials, mem_ctx, &flags, chal, names_blob,
&lm_resp, &nt_resp, NULL, NULL);
if (!NT_STATUS_IS_OK(status)) {
return NULL;
}
return wb_cmd_pam_auth_crap_send(mem_ctx, service,
0 /* logon parameters */,
domain, user, workstation,
chal, nt_resp, lm_resp);
}
NTSTATUS wb_cmd_pam_auth_recv(struct composite_context *c)
{
struct pam_auth_crap_state *state =
talloc_get_type(c->private_data, struct pam_auth_crap_state);
NTSTATUS status = composite_wait(c);
talloc_free(state);
return status;
}
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