mirror of
https://github.com/samba-team/samba.git
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ddc632378a
(This used to be commit fc6458d0d4
)
385 lines
12 KiB
C
385 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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Authenticate a user
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Copyright (C) Volker Lendecke 2005
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "libcli/composite/composite.h"
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#include "winbind/wb_async_helpers.h"
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#include "winbind/wb_server.h"
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#include "smbd/service_stream.h"
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#include "smbd/service_task.h"
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#include "libcli/auth/credentials.h"
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/* Oh, there is so much to keep an eye on when authenticating a user. Oh my! */
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struct pam_auth_crap_state {
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struct composite_context *ctx;
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struct event_context *event_ctx;
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uint32_t logon_parameters;
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const char *domain_name;
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const char *user_name;
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const char *workstation;
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DATA_BLOB chal, nt_resp, lm_resp;
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struct creds_CredentialState *creds_state;
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struct netr_Authenticator auth, auth2;
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struct netr_NetworkInfo ninfo;
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struct netr_LogonSamLogon r;
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struct netr_UserSessionKey user_session_key;
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struct netr_LMSessionKey lm_key;
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DATA_BLOB info3;
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};
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/*
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* NTLM authentication.
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*/
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static void pam_auth_crap_recv_domain(struct composite_context *ctx);
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static void pam_auth_crap_recv_samlogon(struct rpc_request *req);
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struct composite_context *wb_cmd_pam_auth_crap_send(TALLOC_CTX *mem_ctx,
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struct wbsrv_service *service,
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uint32_t logon_parameters,
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const char *domain,
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const char *user,
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const char *workstation,
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DATA_BLOB chal,
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DATA_BLOB nt_resp,
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DATA_BLOB lm_resp)
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{
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struct composite_context *result, *ctx;
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struct pam_auth_crap_state *state;
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result = talloc(mem_ctx, struct composite_context);
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if (result == NULL) goto failed;
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result->state = COMPOSITE_STATE_IN_PROGRESS;
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result->async.fn = NULL;
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result->event_ctx = service->task->event_ctx;
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state = talloc(result, struct pam_auth_crap_state);
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if (state == NULL) goto failed;
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state->ctx = result;
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result->private_data = state;
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state->logon_parameters = logon_parameters;
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state->domain_name = talloc_strdup(state, domain);
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if (state->domain_name == NULL) goto failed;
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state->user_name = talloc_strdup(state, user);
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if (state->user_name == NULL) goto failed;
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state->workstation = talloc_strdup(state, workstation);
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if (state->workstation == NULL) goto failed;
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state->chal = data_blob_talloc(state, chal.data, chal.length);
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if ((chal.data != NULL) && (state->chal.data == NULL)) goto failed;
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state->nt_resp = data_blob_talloc(state, nt_resp.data, nt_resp.length);
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if ((nt_resp.data != NULL) &&
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(state->nt_resp.data == NULL)) goto failed;
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state->lm_resp = data_blob_talloc(state, lm_resp.data, lm_resp.length);
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if ((lm_resp.data != NULL) &&
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(state->lm_resp.data == NULL)) goto failed;
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ctx = wb_sid2domain_send(state, service, service->primary_sid);
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if (ctx == NULL) goto failed;
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ctx->async.fn = pam_auth_crap_recv_domain;
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ctx->async.private_data = state;
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return result;
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failed:
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talloc_free(result);
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return NULL;
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}
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/*
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NTLM Authentication
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Send of a SamLogon request to authenticate a user.
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*/
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static void pam_auth_crap_recv_domain(struct composite_context *ctx)
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{
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struct pam_auth_crap_state *state =
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talloc_get_type(ctx->async.private_data,
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struct pam_auth_crap_state);
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struct rpc_request *req;
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struct wbsrv_domain *domain;
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state->ctx->status = wb_sid2domain_recv(ctx, &domain);
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state->creds_state =
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cli_credentials_get_netlogon_creds(domain->schannel_creds);
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creds_client_authenticator(state->creds_state, &state->auth);
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state->ninfo.identity_info.account_name.string = state->user_name;
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state->ninfo.identity_info.domain_name.string = state->domain_name;
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state->ninfo.identity_info.parameter_control = state->logon_parameters;
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state->ninfo.identity_info.logon_id_low = 0;
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state->ninfo.identity_info.logon_id_high = 0;
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state->ninfo.identity_info.workstation.string = state->workstation;
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SMB_ASSERT(state->chal.length == sizeof(state->ninfo.challenge));
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memcpy(state->ninfo.challenge, state->chal.data,
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sizeof(state->ninfo.challenge));
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state->ninfo.nt.length = state->nt_resp.length;
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state->ninfo.nt.data = state->nt_resp.data;
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state->ninfo.lm.length = state->lm_resp.length;
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state->ninfo.lm.data = state->lm_resp.data;
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state->r.in.server_name = talloc_asprintf(
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state, "\\\\%s", dcerpc_server_name(domain->netlogon_pipe));
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if (composite_nomem(state->r.in.server_name, state->ctx)) return;
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ZERO_STRUCT(state->auth2);
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state->r.in.workstation =
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cli_credentials_get_workstation(domain->schannel_creds);
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state->r.in.credential = &state->auth;
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state->r.in.return_authenticator = &state->auth2;
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state->r.in.logon_level = 2;
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state->r.in.validation_level = 3;
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state->r.in.logon.network = &state->ninfo;
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state->r.out.return_authenticator = NULL;
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req = dcerpc_netr_LogonSamLogon_send(domain->netlogon_pipe, state,
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&state->r);
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composite_continue_rpc(state->ctx, req, pam_auth_crap_recv_samlogon,
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state);
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}
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/*
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NTLM Authentication
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Check the SamLogon reply, decrypt and parse out the session keys and the
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info3 structure.
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*/
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static void pam_auth_crap_recv_samlogon(struct rpc_request *req)
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{
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struct pam_auth_crap_state *state =
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talloc_get_type(req->async.private,
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struct pam_auth_crap_state);
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struct netr_SamBaseInfo *base;
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DATA_BLOB tmp_blob;
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state->ctx->status = dcerpc_ndr_request_recv(req);
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if (!composite_is_ok(state->ctx)) return;
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if ((state->r.out.return_authenticator == NULL) ||
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(!creds_client_check(state->creds_state,
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&state->r.out.return_authenticator->cred))) {
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DEBUG(0, ("Credentials check failed!\n"));
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composite_error(state->ctx, NT_STATUS_ACCESS_DENIED);
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return;
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}
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state->ctx->status = state->r.out.result;
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if (!composite_is_ok(state->ctx)) return;
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/* Decrypt the session keys before we reform the info3, so the
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* person on the other end of winbindd pipe doesn't have to.
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* They won't have the encryption key anyway */
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creds_decrypt_samlogon(state->creds_state,
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state->r.in.validation_level,
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&state->r.out.validation);
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state->ctx->status = ndr_push_struct_blob(
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&tmp_blob, state, state->r.out.validation.sam3,
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(ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
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if (!composite_is_ok(state->ctx)) return;
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/* The Samba3 protocol is a bit broken (due to non-IDL
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* heritage, so for compatability we must add a non-zero 4
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* bytes to the info3 */
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state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4);
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if (composite_nomem(state->info3.data, state->ctx)) return;
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SIVAL(state->info3.data, 0, 1);
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memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length);
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/* We actually only ask for level 3, and assume it above, but
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* anyway... */
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base = NULL;
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switch(state->r.in.validation_level) {
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case 2:
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base = &state->r.out.validation.sam2->base;
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break;
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case 3:
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base = &state->r.out.validation.sam3->base;
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break;
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case 6:
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base = &state->r.out.validation.sam6->base;
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break;
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}
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if (base == NULL) {
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composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
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return;
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}
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state->user_session_key = base->key;
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state->lm_key = base->LMSessKey;
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/* Give the caller the most accurate username possible.
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* Assists where case sensitive comparisons may be done by our
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* ntlm_auth callers */
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if (base->account_name.string) {
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state->user_name = base->account_name.string;
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talloc_steal(state, base->account_name.string);
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}
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if (base->domain.string) {
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state->domain_name = base->domain.string;
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talloc_steal(state, base->domain.string);
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}
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composite_done(state->ctx);
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}
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NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *info3,
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struct netr_UserSessionKey *user_session_key,
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struct netr_LMSessionKey *lm_key,
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char **unix_username)
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{
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struct pam_auth_crap_state *state =
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talloc_get_type(c->private_data, struct pam_auth_crap_state);
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NTSTATUS status = composite_wait(c);
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if (NT_STATUS_IS_OK(status)) {
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info3->length = state->info3.length;
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info3->data = talloc_steal(mem_ctx, state->info3.data);
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*user_session_key = state->user_session_key;
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*lm_key = state->lm_key;
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*unix_username = talloc_asprintf(mem_ctx, "%s%s%s",
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state->domain_name,
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lp_winbind_separator(),
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state->user_name);
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if (!*unix_username) {
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status = NT_STATUS_NO_MEMORY;
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}
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}
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talloc_free(state);
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return status;
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}
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NTSTATUS wb_cmd_pam_auth_crap(TALLOC_CTX *mem_ctx,
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struct wbsrv_service *service,
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uint32_t logon_parameters,
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const char *domain, const char *user,
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const char *workstation,
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DATA_BLOB chal, DATA_BLOB nt_resp,
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DATA_BLOB lm_resp,
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DATA_BLOB *info3,
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struct netr_UserSessionKey *user_session_key,
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struct netr_LMSessionKey *lm_key,
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char **unix_username)
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{
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struct composite_context *c =
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wb_cmd_pam_auth_crap_send(mem_ctx, service, logon_parameters,
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domain, user, workstation,
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chal, nt_resp, lm_resp);
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return wb_cmd_pam_auth_crap_recv(c, mem_ctx, info3, user_session_key,
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lm_key, unix_username);
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}
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struct composite_context *wb_cmd_pam_auth_send(TALLOC_CTX *mem_ctx,
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struct wbsrv_service *service,
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const char *domain,
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const char *user,
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const char *password)
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{
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struct cli_credentials *credentials;
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const char *workstation;
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NTSTATUS status;
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DATA_BLOB chal, nt_resp, lm_resp, names_blob;
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int flags = CLI_CRED_NTLM_AUTH;
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if (lp_client_lanman_auth()) {
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flags |= CLI_CRED_LANMAN_AUTH;
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}
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if (lp_client_ntlmv2_auth()) {
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flags |= CLI_CRED_NTLMv2_AUTH;
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}
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DEBUG(5, ("wbsrv_samba3_pam_auth called\n"));
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credentials = cli_credentials_init(mem_ctx);
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if (!credentials) {
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return NULL;
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}
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cli_credentials_set_conf(credentials);
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cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
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cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
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cli_credentials_set_password(credentials, password, CRED_SPECIFIED);
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chal = data_blob_talloc(mem_ctx, NULL, 8);
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if (!chal.data) {
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return NULL;
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}
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generate_random_buffer(chal.data, chal.length);
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cli_credentials_get_ntlm_username_domain(credentials, mem_ctx,
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&user, &domain);
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/* for best compatability with multiple vitual netbios names
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* on the host, this should be generated from the
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* cli_credentials associated with the machine account */
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workstation = cli_credentials_get_workstation(credentials);
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names_blob = NTLMv2_generate_names_blob(
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mem_ctx,
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cli_credentials_get_workstation(credentials),
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cli_credentials_get_domain(credentials));
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status = cli_credentials_get_ntlm_response(
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credentials, mem_ctx, &flags, chal, names_blob,
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&lm_resp, &nt_resp, NULL, NULL);
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if (!NT_STATUS_IS_OK(status)) {
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return NULL;
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}
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return wb_cmd_pam_auth_crap_send(mem_ctx, service,
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0 /* logon parameters */,
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domain, user, workstation,
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chal, nt_resp, lm_resp);
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}
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NTSTATUS wb_cmd_pam_auth_recv(struct composite_context *c)
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{
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struct pam_auth_crap_state *state =
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talloc_get_type(c->private_data, struct pam_auth_crap_state);
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NTSTATUS status = composite_wait(c);
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talloc_free(state);
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return status;
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}
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NTSTATUS wb_cmd_pam_auth(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
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const char *domain, const char *user,
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const char *password)
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{
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struct composite_context *c =
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wb_cmd_pam_auth_send(mem_ctx, service, domain, user, password);
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return wb_cmd_pam_auth_recv(c);
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}
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