source3/auth/auth_samba4.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authenticate against Samba4's auth subsystem
   4    Copyright (C) Volker Lendecke 2008
   5    Copyright (C) Andrew Bartlett 2010
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "source3/include/auth.h"
  23 #include "source4/auth/auth.h"
  24 #include "auth/auth_sam_reply.h"
  25 #include "param/param.h"
  26 #include "source4/lib/events/events.h"
  27 #include "source4/lib/messaging/messaging.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "auth/credentials/credentials.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_AUTH
  33
  34 static NTSTATUS check_samba4_security(const struct auth_context *auth_context,
  35                                       void *my_private_data,
  36                                       TALLOC_CTX *mem_ctx,
  37                                       const struct auth_usersupplied_info *user_info,
  38                                       struct auth_serversupplied_info **server_info)
  39 {
  40         TALLOC_CTX *frame = talloc_stackframe();
  41         struct netr_SamInfo3 *info3 = NULL;
  42         NTSTATUS nt_status;
  43         struct auth_user_info_dc *user_info_dc;
  44         struct auth4_context *auth4_context;
  45         struct loadparm_context *lp_ctx;
  46
  47         lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
  48         if (lp_ctx == NULL) {
  49                 DEBUG(10, ("loadparm_init_s3 failed\n"));
  50                 talloc_free(frame);
  51                 return NT_STATUS_INVALID_SERVER_STATE;
  52         }
  53
  54         /* We create a private tevent context here to avoid nested loops in
  55          * the s3 one, as that may not be expected */
  56         nt_status = auth_context_create(mem_ctx,
  57                                         s4_event_context_init(frame), NULL,
  58                                         lp_ctx,
  59                                         &auth4_context);
  60         NT_STATUS_NOT_OK_RETURN(nt_status);
  61
  62         nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
  63         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
  64
  65         nt_status = auth_check_password(auth4_context, auth4_context, user_info, &user_info_dc);
  66         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
  67
  68         nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
  69                                                        user_info_dc,
  70                                                        &info3);
  71         if (NT_STATUS_IS_OK(nt_status)) {
  72                 /* We need the strings from the server_info to be valid as long as the info3 is around */
  73                 talloc_steal(info3, user_info_dc);
  74         }
  75         talloc_free(auth4_context);
  76
  77         if (!NT_STATUS_IS_OK(nt_status)) {
  78                 goto done;
  79         }
  80
  81         nt_status = make_server_info_info3(mem_ctx, user_info->client.account_name,
  82                                            user_info->mapped.domain_name, server_info,
  83                                         info3);
  84         if (!NT_STATUS_IS_OK(nt_status)) {
  85                 DEBUG(10, ("make_server_info_info3 failed: %s\n",
  86                            nt_errstr(nt_status)));
  87                 TALLOC_FREE(frame);
  88                 return nt_status;
  89         }
  90
  91         nt_status = NT_STATUS_OK;
  92
  93  done:
  94         TALLOC_FREE(frame);
  95         return nt_status;
  96 }
  97
  98 /* Hook to allow GENSEC to handle blob-based authentication
  99  * mechanisms, without directly linking the mechansim code */
 100 static NTSTATUS prepare_gensec(TALLOC_CTX *mem_ctx,
 101                                struct gensec_security **gensec_context)
 102 {
 103         NTSTATUS status;
 104         struct loadparm_context *lp_ctx;
 105         struct tevent_context *event_ctx;
 106         TALLOC_CTX *frame = talloc_stackframe();
 107         struct gensec_security *gensec_ctx;
 108         struct imessaging_context *msg_ctx;
 109         struct cli_credentials *server_credentials;
 110         struct server_id *server_id;
 111
 112         lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
 113         if (lp_ctx == NULL) {
 114                 DEBUG(1, ("loadparm_init_s3 failed\n"));
 115                 TALLOC_FREE(frame);
 116                 return NT_STATUS_INVALID_SERVER_STATE;
 117         }
 118         event_ctx = s4_event_context_init(frame);
 119         if (event_ctx == NULL) {
 120                 DEBUG(1, ("s4_event_context_init failed\n"));
 121                 TALLOC_FREE(frame);
 122                 return NT_STATUS_INVALID_SERVER_STATE;
 123         }
 124
 125         server_id = new_server_id_task(frame);
 126         if (server_id == NULL) {
 127                 DEBUG(1, ("new_server_id_task failed\n"));
 128                 TALLOC_FREE(frame);
 129                 return NT_STATUS_INVALID_SERVER_STATE;
 130         }
 131
 132         msg_ctx = imessaging_init(frame,
 133                                   lp_ctx,
 134                                   *server_id,
 135                                   event_ctx, true);
 136         if (msg_ctx == NULL) {
 137                 DEBUG(1, ("imessaging_init failed\n"));
 138                 TALLOC_FREE(frame);
 139                 return NT_STATUS_INVALID_SERVER_STATE;
 140         }
 141
 142         talloc_reparent(frame, msg_ctx, server_id);
 143
 144         server_credentials
 145                 = cli_credentials_init(frame);
 146         if (!server_credentials) {
 147                 DEBUG(1, ("Failed to init server credentials"));
 148                 TALLOC_FREE(frame);
 149                 return NT_STATUS_INVALID_SERVER_STATE;
 150         }
 151
 152         cli_credentials_set_conf(server_credentials, lp_ctx);
 153         status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
 154         if (!NT_STATUS_IS_OK(status)) {
 155                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
 156                 talloc_free(server_credentials);
 157                 server_credentials = NULL;
 158         }
 159
 160         status = samba_server_gensec_start(mem_ctx,
 161                                            event_ctx, msg_ctx,
 162                                            lp_ctx, server_credentials, "cifs",
 163                                            &gensec_ctx);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 166                 TALLOC_FREE(frame);
 167                 return status;
 168         }
 169
 170         talloc_reparent(frame, gensec_ctx, msg_ctx);
 171         talloc_reparent(frame, gensec_ctx, event_ctx);
 172         talloc_reparent(frame, gensec_ctx, lp_ctx);
 173         talloc_reparent(frame, gensec_ctx, server_credentials);
 174
 175         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 176         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
 177
 178         *gensec_context = gensec_ctx;
 179         TALLOC_FREE(frame);
 180         return status;
 181 }
 182
 183 /* Hook to allow handling of NTLM authentication for AD operation
 184  * without directly linking the s4 auth stack */
 185 static NTSTATUS make_auth4_context_s4(TALLOC_CTX *mem_ctx,
 186                                       struct auth4_context **auth4_context)
 187 {
 188         NTSTATUS status;
 189         struct loadparm_context *lp_ctx;
 190         struct tevent_context *event_ctx;
 191         TALLOC_CTX *frame = talloc_stackframe();
 192         struct imessaging_context *msg_ctx;
 193         struct server_id *server_id;
 194
 195         lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
 196         if (lp_ctx == NULL) {
 197                 DEBUG(1, ("loadparm_init_s3 failed\n"));
 198                 TALLOC_FREE(frame);
 199                 return NT_STATUS_INVALID_SERVER_STATE;
 200         }
 201         event_ctx = s4_event_context_init(frame);
 202         if (event_ctx == NULL) {
 203                 DEBUG(1, ("s4_event_context_init failed\n"));
 204                 TALLOC_FREE(frame);
 205                 return NT_STATUS_INVALID_SERVER_STATE;
 206         }
 207
 208         server_id = new_server_id_task(frame);
 209         if (server_id == NULL) {
 210                 DEBUG(1, ("new_server_id_task failed\n"));
 211                 TALLOC_FREE(frame);
 212                 return NT_STATUS_INVALID_SERVER_STATE;
 213         }
 214
 215         msg_ctx = imessaging_init(frame,
 216                                   lp_ctx,
 217                                   *server_id,
 218                                   event_ctx, true);
 219         if (msg_ctx == NULL) {
 220                 DEBUG(1, ("imessaging_init failed\n"));
 221                 TALLOC_FREE(frame);
 222                 return NT_STATUS_INVALID_SERVER_STATE;
 223         }
 224         talloc_reparent(frame, msg_ctx, server_id);
 225
 226         status = auth_context_create(mem_ctx,
 227                                         event_ctx,
 228                                         msg_ctx,
 229                                         lp_ctx,
 230                                         auth4_context);
 231
 232         if (!NT_STATUS_IS_OK(status)) {
 233                 DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
 234                 TALLOC_FREE(frame);
 235                 return status;
 236         }
 237
 238         talloc_reparent(frame, *auth4_context, msg_ctx);
 239         talloc_reparent(frame, *auth4_context, event_ctx);
 240         talloc_reparent(frame, *auth4_context, lp_ctx);
 241
 242         TALLOC_FREE(frame);
 243         return status;
 244 }
 245
 246 /* module initialisation */
 247 static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
 248                                     const char *param,
 249                                     auth_methods **auth_method)
 250 {
 251         struct auth_methods *result;
 252
 253         gensec_init();
 254
 255         result = talloc_zero(auth_context, struct auth_methods);
 256         if (result == NULL) {
 257                 return NT_STATUS_NO_MEMORY;
 258         }
 259         result->name = "samba4";
 260         result->auth = check_samba4_security;
 261         result->prepare_gensec = prepare_gensec;
 262         result->make_auth4_context = make_auth4_context_s4;
 263
 264         *auth_method = result;
 265         return NT_STATUS_OK;
 266 }
 267
 268 NTSTATUS auth_samba4_init(void)
 269 {
 270         smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
 271                           auth_init_samba4);
 272         return NT_STATUS_OK;
 273 }