mirror of
https://github.com/samba-team/samba.git
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0ccdaa940a
metze
292 lines
8.9 KiB
C
292 lines
8.9 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 3 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, see <http://www.gnu.org/licenses/>.
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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_server.h"
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#include "smbd/service_task.h"
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#include "auth/credentials/credentials.h"
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#include "libcli/auth/libcli_auth.h"
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#include "librpc/gen_ndr/ndr_netlogon.h"
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#include "librpc/gen_ndr/winbind.h"
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#include "param/param.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 tevent_context *event_ctx;
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struct loadparm_context *lp_ctx;
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struct winbind_SamLogon *req;
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char *unix_username;
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struct netr_NetworkInfo ninfo;
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struct netr_LogonSamLogon r;
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const char *user_name;
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const char *domain_name;
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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_logon(struct tevent_req *subreq);
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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;
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struct pam_auth_crap_state *state;
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struct netr_NetworkInfo *ninfo;
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DATA_BLOB tmp_nt_resp, tmp_lm_resp;
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struct tevent_req *subreq;
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result = composite_create(mem_ctx, service->task->event_ctx);
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if (result == NULL) goto failed;
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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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state->lp_ctx = service->task->lp_ctx;
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result->private_data = state;
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state->req = talloc(state, struct winbind_SamLogon);
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state->req->in.logon_level = 2;
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state->req->in.validation_level = 3;
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ninfo = state->req->in.logon.network = talloc(state, struct netr_NetworkInfo);
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if (ninfo == NULL) goto failed;
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ninfo->identity_info.account_name.string = talloc_strdup(state, user);
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ninfo->identity_info.domain_name.string = talloc_strdup(state, domain);
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ninfo->identity_info.parameter_control = logon_parameters;
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ninfo->identity_info.logon_id_low = 0;
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ninfo->identity_info.logon_id_high = 0;
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ninfo->identity_info.workstation.string = talloc_strdup(state, workstation);
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SMB_ASSERT(chal.length == sizeof(ninfo->challenge));
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memcpy(ninfo->challenge, chal.data,
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sizeof(ninfo->challenge));
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tmp_nt_resp = data_blob_talloc(ninfo, nt_resp.data, nt_resp.length);
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if ((nt_resp.data != NULL) &&
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(tmp_nt_resp.data == NULL)) goto failed;
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tmp_lm_resp = data_blob_talloc(ninfo, lm_resp.data, lm_resp.length);
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if ((lm_resp.data != NULL) &&
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(tmp_lm_resp.data == NULL)) goto failed;
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ninfo->nt.length = tmp_nt_resp.length;
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ninfo->nt.data = tmp_nt_resp.data;
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ninfo->lm.length = tmp_lm_resp.length;
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ninfo->lm.data = tmp_lm_resp.data;
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state->unix_username = NULL;
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subreq = wb_sam_logon_send(state,
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service->task->event_ctx,
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service, state->req);
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if (subreq == NULL) goto failed;
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tevent_req_set_callback(subreq, pam_auth_crap_recv_logon, 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_logon(struct tevent_req *subreq)
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{
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DATA_BLOB tmp_blob;
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enum ndr_err_code ndr_err;
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struct netr_SamBaseInfo *base;
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struct pam_auth_crap_state *state =
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tevent_req_callback_data(subreq,
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struct pam_auth_crap_state);
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state->ctx->status = wb_sam_logon_recv(subreq, state, state->req);
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TALLOC_FREE(subreq);
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if (!composite_is_ok(state->ctx)) return;
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ndr_err = ndr_push_struct_blob(
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&tmp_blob, state, state->req->out.validation.sam3,
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(ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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state->ctx->status = ndr_map_error2ntstatus(ndr_err);
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if (!composite_is_ok(state->ctx)) return;
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}
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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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base = &state->req->out.validation.sam3->base;
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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->logon_domain.string) {
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state->domain_name = base->logon_domain.string;
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talloc_steal(state, base->logon_domain.string);
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}
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state->unix_username = talloc_asprintf(state, "%s%s%s",
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state->domain_name,
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lpcfg_winbind_separator(state->lp_ctx),
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state->user_name);
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if (composite_nomem(state->unix_username, state->ctx)) return;
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composite_done(state->ctx);
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}
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/* Having received a NTLM authentication reply, parse out the useful
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* reply data for the caller */
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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_steal(mem_ctx, state->unix_username);
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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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/* Handle plaintext authentication, by encrypting the password and
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* then sending via the NTLM calls */
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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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struct cli_credentials *credentials)
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{
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const char *workstation;
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NTSTATUS status;
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const char *user, *domain;
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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 (lpcfg_client_lanman_auth(service->task->lp_ctx)) {
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flags |= CLI_CRED_LANMAN_AUTH;
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}
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if (lpcfg_client_ntlmv2_auth(service->task->lp_ctx)) {
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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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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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MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT|MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT /* 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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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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if (info3) {
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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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}
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if (user_session_key) {
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*user_session_key = state->user_session_key;
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}
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if (lm_key) {
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*lm_key = state->lm_key;
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}
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if (unix_username) {
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*unix_username = talloc_steal(mem_ctx, state->unix_username);
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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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