source4/winbind/wb_pam_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Authenticate a user
   5
   6    Copyright (C) Volker Lendecke 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/composite/composite.h"
  25 #include "winbind/wb_async_helpers.h"
  26 #include "winbind/wb_server.h"
  27 #include "smbd/service_stream.h"
  28 #include "libcli/auth/credentials.h"
  29
  30 struct pam_auth_crap_state {
  31         struct composite_context *ctx;
  32         struct wbsrv_domain *domain;
  33         const char *domain_name;
  34         const char *user_name;
  35         const char *workstation;
  36         DATA_BLOB chal, nt_resp, lm_resp;
  37
  38         struct creds_CredentialState *creds_state;
  39         struct netr_Authenticator auth, auth2;
  40         struct netr_NetworkInfo ninfo;
  41         struct netr_LogonSamLogon r;
  42
  43         struct netr_UserSessionKey user_session_key;
  44         struct netr_LMSessionKey lm_key;
  45         DATA_BLOB info3;
  46 };
  47
  48 static struct rpc_request *send_samlogon(struct pam_auth_crap_state *state);
  49 static void pam_auth_crap_recv_init(struct composite_context *ctx);
  50 static void pam_auth_crap_recv_samlogon(struct rpc_request *req);
  51
  52 struct composite_context *wb_cmd_pam_auth_crap_send(struct wbsrv_call *call,
  53                                                     const char *domain,
  54                                                     const char *user,
  55                                                     const char *workstation,
  56                                                     DATA_BLOB chal,
  57                                                     DATA_BLOB nt_resp,
  58                                                     DATA_BLOB lm_resp)
  59 {
  60         struct composite_context *result, *ctx;
  61         struct pam_auth_crap_state *state;
  62         struct wbsrv_service *service = call->wbconn->listen_socket->service;
  63
  64         result = talloc(NULL, struct composite_context);
  65         if (result == NULL) goto failed;
  66         result->state = COMPOSITE_STATE_IN_PROGRESS;
  67         result->event_ctx = call->event_ctx;
  68         result->async.fn = NULL;
  69
  70         state = talloc(result, struct pam_auth_crap_state);
  71         if (state == NULL) goto failed;
  72         state->ctx = result;
  73         result->private_data = state;
  74
  75         state->domain = service->domains;
  76
  77         state->domain_name = talloc_strdup(state, domain);
  78         if (state->domain_name == NULL) goto failed;
  79
  80         state->user_name = talloc_strdup(state, user);
  81         if (state->user_name == NULL) goto failed;
  82
  83         state->workstation = talloc_strdup(state, workstation);
  84         if (state->workstation == NULL) goto failed;
  85
  86         state->chal = data_blob_talloc(state, chal.data, chal.length);
  87         if ((chal.data != NULL) && (state->chal.data == NULL)) goto failed;
  88
  89         state->nt_resp = data_blob_talloc(state, nt_resp.data, nt_resp.length);
  90         if ((nt_resp.data != NULL) &&
  91             (state->nt_resp.data == NULL)) goto failed;
  92
  93         state->lm_resp = data_blob_talloc(state, lm_resp.data, lm_resp.length);
  94         if ((lm_resp.data != NULL) &&
  95             (state->lm_resp.data == NULL)) goto failed;
  96
  97         if (state->domain->initialized) {
  98                 struct rpc_request *req = send_samlogon(state);
  99                 if (req == NULL) goto failed;
 100                 req->async.callback = pam_auth_crap_recv_samlogon;
 101                 req->async.private = state;
 102                 return result;
 103         }
 104
 105         ctx = wb_init_domain_send(state->domain, result->event_ctx,
 106                                   call->wbconn->conn->msg_ctx);
 107         if (ctx == NULL) goto failed;
 108         ctx->async.fn = pam_auth_crap_recv_init;
 109         ctx->async.private_data = state;
 110         return result;
 111
 112  failed:
 113         talloc_free(result);
 114         return NULL;
 115 }
 116
 117 static void pam_auth_crap_recv_init(struct composite_context *ctx)
 118 {
 119         struct pam_auth_crap_state *state =
 120                 talloc_get_type(ctx->async.private_data,
 121                                 struct pam_auth_crap_state);
 122         struct rpc_request *req;
 123
 124         state->ctx->status = wb_init_domain_recv(ctx);
 125         if (!composite_is_ok(state->ctx)) return;
 126
 127         req = send_samlogon(state);
 128         composite_continue_rpc(state->ctx, req,
 129                                pam_auth_crap_recv_samlogon, state);
 130 }
 131
 132 static struct rpc_request *send_samlogon(struct pam_auth_crap_state *state)
 133 {
 134         state->creds_state = cli_credentials_get_netlogon_creds(
 135                 state->domain->schannel_creds);
 136         creds_client_authenticator(state->creds_state, &state->auth);
 137
 138         state->ninfo.identity_info.account_name.string = state->user_name;
 139         state->ninfo.identity_info.domain_name.string =  state->domain_name;
 140         state->ninfo.identity_info.parameter_control = 0;
 141         state->ninfo.identity_info.logon_id_low = 0;
 142         state->ninfo.identity_info.logon_id_high = 0;
 143         state->ninfo.identity_info.workstation.string = state->workstation;
 144
 145         SMB_ASSERT(state->chal.length == sizeof(state->ninfo.challenge));
 146         memcpy(state->ninfo.challenge, state->chal.data,
 147                sizeof(state->ninfo.challenge));
 148
 149         state->ninfo.nt.length = state->nt_resp.length;
 150         state->ninfo.nt.data = state->nt_resp.data;
 151         state->ninfo.lm.length = state->lm_resp.length;
 152         state->ninfo.lm.data = state->lm_resp.data;
 153
 154         state->r.in.server_name = talloc_asprintf(
 155                 state, "\\\\%s",
 156                 dcerpc_server_name(state->domain->netlogon_pipe));
 157         if (state->r.in.server_name == NULL) return NULL;
 158
 159         state->r.in.workstation = cli_credentials_get_workstation(
 160                 state->domain->schannel_creds);
 161         state->r.in.credential = &state->auth;
 162         state->r.in.return_authenticator = &state->auth2;
 163         state->r.in.logon_level = 2;
 164         state->r.in.validation_level = 3;
 165         state->r.in.logon.network = &state->ninfo;
 166         state->r.out.return_authenticator = NULL;
 167
 168         return dcerpc_netr_LogonSamLogon_send(state->domain->netlogon_pipe,
 169                                               state, &state->r);
 170 }
 171
 172 static void pam_auth_crap_recv_samlogon(struct rpc_request *req)
 173 {
 174         struct pam_auth_crap_state *state =
 175                 talloc_get_type(req->async.private,
 176                                 struct pam_auth_crap_state);
 177         struct netr_SamBaseInfo *base;
 178         DATA_BLOB tmp_blob;
 179
 180         state->ctx->status = dcerpc_ndr_request_recv(req);
 181         if (!composite_is_ok(state->ctx)) return;
 182         state->ctx->status = state->r.out.result;
 183         if (!composite_is_ok(state->ctx)) return;
 184
 185         if ((state->r.out.return_authenticator == NULL) ||
 186             (!creds_client_check(state->creds_state,
 187                                  &state->r.out.return_authenticator->cred))) {
 188                 DEBUG(0, ("Credentials check failed!\n"));
 189                 composite_error(state->ctx, NT_STATUS_ACCESS_DENIED);
 190                 return;
 191         }
 192
 193         creds_decrypt_samlogon(state->creds_state,
 194                                state->r.in.validation_level,
 195                                &state->r.out.validation);
 196
 197         state->ctx->status = ndr_push_struct_blob(
 198                 &tmp_blob, state, state->r.out.validation.sam3,
 199                 (ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
 200         if (!composite_is_ok(state->ctx)) return;
 201
 202         state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4);
 203         if (composite_nomem(state->info3.data, state->ctx)) return;
 204
 205         SIVAL(state->info3.data, 0, 1);
 206         memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length);
 207
 208         base = NULL;
 209         switch(state->r.in.validation_level) {
 210         case 2:
 211                 base = &state->r.out.validation.sam2->base;
 212                 break;
 213         case 3:
 214                 base = &state->r.out.validation.sam3->base;
 215                 break;
 216         case 6:
 217                 base = &state->r.out.validation.sam6->base;
 218                 break;
 219         }
 220         if (base == NULL) {
 221                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 222                 return;
 223         }
 224
 225         state->user_session_key = base->key;
 226         state->lm_key = base->LMSessKey;
 227
 228         composite_done(state->ctx);
 229 }
 230
 231 NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c,
 232                                    TALLOC_CTX *mem_ctx,
 233                                    DATA_BLOB *info3,
 234                                    struct netr_UserSessionKey *user_session_key,
 235                                    struct netr_LMSessionKey *lm_key)
 236 {
 237         NTSTATUS status = composite_wait(c);
 238         if (NT_STATUS_IS_OK(status)) {
 239                 struct pam_auth_crap_state *state =
 240                         talloc_get_type(c->private_data,
 241                                         struct pam_auth_crap_state);
 242                 info3->length = state->info3.length;
 243                 info3->data = talloc_steal(mem_ctx, state->info3.data);
 244                 *user_session_key = state->user_session_key;
 245                 *lm_key = state->lm_key;
 246         }
 247         talloc_free(c);
 248         return status;
 249 }
 250
 251 NTSTATUS wb_cmd_pam_auth_crap(struct wbsrv_call *call,
 252                               const char *domain, const char *user,
 253                               const char *workstation,
 254                               DATA_BLOB chal, DATA_BLOB nt_resp,
 255                               DATA_BLOB lm_resp, TALLOC_CTX *mem_ctx,
 256                               DATA_BLOB *info3,
 257                               struct netr_UserSessionKey *user_session_key,
 258                               struct netr_LMSessionKey *lm_key)
 259 {
 260         struct composite_context *c =
 261                 wb_cmd_pam_auth_crap_send(call, domain, user, workstation,
 262                                           chal, nt_resp, lm_resp);
 263         return wb_cmd_pam_auth_crap_recv(c, mem_ctx, info3, user_session_key,
 264                                          lm_key);
 265 }