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 /*
  35  * This hook is currently unused, as all NTLM logins go via the hooks
  36  * provided by make_auth4_context_s4() below.
  37  *
  38  * This is only left in case we find a way that it might become useful
  39  * in future.  Importantly, this routine returns the information
  40  * needed for a NETLOGON SamLogon, not what is needed to establish a
  41  * session.
  42  */
  43
  44 static NTSTATUS check_samba4_security(const struct auth_context *auth_context,
  45                                       void *my_private_data,
  46                                       TALLOC_CTX *mem_ctx,
  47                                       const struct auth_usersupplied_info *user_info,
  48                                       struct auth_serversupplied_info **server_info)
  49 {
  50         TALLOC_CTX *frame = talloc_stackframe();
  51         struct netr_SamInfo3 *info3 = NULL;
  52         NTSTATUS nt_status;
  53         struct auth_user_info_dc *user_info_dc;
  54         struct auth4_context *auth4_context;
  55         struct loadparm_context *lp_ctx;
  56
  57         lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
  58         if (lp_ctx == NULL) {
  59                 DEBUG(10, ("loadparm_init_s3 failed\n"));
  60                 talloc_free(frame);
  61                 return NT_STATUS_INVALID_SERVER_STATE;
  62         }
  63
  64         /* We create a private tevent context here to avoid nested loops in
  65          * the s3 one, as that may not be expected */
  66         nt_status = auth_context_create(mem_ctx,
  67                                         s4_event_context_init(frame), NULL,
  68                                         lp_ctx,
  69                                         &auth4_context);
  70         NT_STATUS_NOT_OK_RETURN(nt_status);
  71
  72         nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
  73         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
  74
  75         nt_status = auth_check_password(auth4_context, auth4_context, user_info, &user_info_dc);
  76         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
  77
  78         nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
  79                                                        user_info_dc,
  80                                                        &info3);
  81         if (NT_STATUS_IS_OK(nt_status)) {
  82                 /* We need the strings from the server_info to be valid as long as the info3 is around */
  83                 talloc_steal(info3, user_info_dc);
  84         }
  85         talloc_free(auth4_context);
  86
  87         if (!NT_STATUS_IS_OK(nt_status)) {
  88                 goto done;
  89         }
  90
  91         nt_status = make_server_info_info3(mem_ctx, user_info->client.account_name,
  92                                            user_info->mapped.domain_name, server_info,
  93                                         info3);
  94         if (!NT_STATUS_IS_OK(nt_status)) {
  95                 DEBUG(10, ("make_server_info_info3 failed: %s\n",
  96                            nt_errstr(nt_status)));
  97                 TALLOC_FREE(frame);
  98                 return nt_status;
  99         }
 100
 101         nt_status = NT_STATUS_OK;
 102
 103  done:
 104         TALLOC_FREE(frame);
 105         return nt_status;
 106 }
 107
 108 /* Hook to allow GENSEC to handle blob-based authentication
 109  * mechanisms, without directly linking the mechanism code */
 110 static NTSTATUS prepare_gensec(TALLOC_CTX *mem_ctx,
 111                                struct gensec_security **gensec_context)
 112 {
 113         NTSTATUS status;
 114         struct loadparm_context *lp_ctx;
 115         struct tevent_context *event_ctx;
 116         TALLOC_CTX *frame = talloc_stackframe();
 117         struct gensec_security *gensec_ctx;
 118         struct imessaging_context *msg_ctx;
 119         struct cli_credentials *server_credentials;
 120         struct server_id *server_id;
 121
 122         lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
 123         if (lp_ctx == NULL) {
 124                 DEBUG(1, ("loadparm_init_s3 failed\n"));
 125                 TALLOC_FREE(frame);
 126                 return NT_STATUS_INVALID_SERVER_STATE;
 127         }
 128         event_ctx = s4_event_context_init(frame);
 129         if (event_ctx == NULL) {
 130                 DEBUG(1, ("s4_event_context_init failed\n"));
 131                 TALLOC_FREE(frame);
 132                 return NT_STATUS_INVALID_SERVER_STATE;
 133         }
 134
 135         server_id = new_server_id_task(frame);
 136         if (server_id == NULL) {
 137                 DEBUG(1, ("new_server_id_task failed\n"));
 138                 TALLOC_FREE(frame);
 139                 return NT_STATUS_INVALID_SERVER_STATE;
 140         }
 141
 142         msg_ctx = imessaging_init(frame,
 143                                   lp_ctx,
 144                                   *server_id,
 145                                   event_ctx, true);
 146         if (msg_ctx == NULL) {
 147                 DEBUG(1, ("imessaging_init failed\n"));
 148                 TALLOC_FREE(frame);
 149                 return NT_STATUS_INVALID_SERVER_STATE;
 150         }
 151
 152         talloc_reparent(frame, msg_ctx, server_id);
 153
 154         server_credentials
 155                 = cli_credentials_init(frame);
 156         if (!server_credentials) {
 157                 DEBUG(1, ("Failed to init server credentials"));
 158                 TALLOC_FREE(frame);
 159                 return NT_STATUS_INVALID_SERVER_STATE;
 160         }
 161
 162         cli_credentials_set_conf(server_credentials, lp_ctx);
 163         status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
 166                 talloc_free(server_credentials);
 167                 server_credentials = NULL;
 168         }
 169
 170         status = samba_server_gensec_start(mem_ctx,
 171                                            event_ctx, msg_ctx,
 172                                            lp_ctx, server_credentials, "cifs",
 173                                            &gensec_ctx);
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 176                 TALLOC_FREE(frame);
 177                 return status;
 178         }
 179
 180         talloc_reparent(frame, gensec_ctx, msg_ctx);
 181         talloc_reparent(frame, gensec_ctx, event_ctx);
 182         talloc_reparent(frame, gensec_ctx, lp_ctx);
 183         talloc_reparent(frame, gensec_ctx, server_credentials);
 184
 185         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 186         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
 187
 188         *gensec_context = gensec_ctx;
 189         TALLOC_FREE(frame);
 190         return status;
 191 }
 192
 193 /* Hook to allow handling of NTLM authentication for AD operation
 194  * without directly linking the s4 auth stack */
 195 static NTSTATUS make_auth4_context_s4(TALLOC_CTX *mem_ctx,
 196                                       struct auth4_context **auth4_context)
 197 {
 198         NTSTATUS status;
 199         struct loadparm_context *lp_ctx;
 200         struct tevent_context *event_ctx;
 201         TALLOC_CTX *frame = talloc_stackframe();
 202         struct imessaging_context *msg_ctx;
 203         struct server_id *server_id;
 204
 205         lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
 206         if (lp_ctx == NULL) {
 207                 DEBUG(1, ("loadparm_init_s3 failed\n"));
 208                 TALLOC_FREE(frame);
 209                 return NT_STATUS_INVALID_SERVER_STATE;
 210         }
 211         event_ctx = s4_event_context_init(frame);
 212         if (event_ctx == NULL) {
 213                 DEBUG(1, ("s4_event_context_init failed\n"));
 214                 TALLOC_FREE(frame);
 215                 return NT_STATUS_INVALID_SERVER_STATE;
 216         }
 217
 218         server_id = new_server_id_task(frame);
 219         if (server_id == NULL) {
 220                 DEBUG(1, ("new_server_id_task failed\n"));
 221                 TALLOC_FREE(frame);
 222                 return NT_STATUS_INVALID_SERVER_STATE;
 223         }
 224
 225         msg_ctx = imessaging_init(frame,
 226                                   lp_ctx,
 227                                   *server_id,
 228                                   event_ctx, true);
 229         if (msg_ctx == NULL) {
 230                 DEBUG(1, ("imessaging_init failed\n"));
 231                 TALLOC_FREE(frame);
 232                 return NT_STATUS_INVALID_SERVER_STATE;
 233         }
 234         talloc_reparent(frame, msg_ctx, server_id);
 235
 236         status = auth_context_create(mem_ctx,
 237                                         event_ctx,
 238                                         msg_ctx,
 239                                         lp_ctx,
 240                                         auth4_context);
 241
 242         if (!NT_STATUS_IS_OK(status)) {
 243                 DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
 244                 TALLOC_FREE(frame);
 245                 return status;
 246         }
 247
 248         talloc_reparent(frame, *auth4_context, msg_ctx);
 249         talloc_reparent(frame, *auth4_context, event_ctx);
 250         talloc_reparent(frame, *auth4_context, lp_ctx);
 251
 252         TALLOC_FREE(frame);
 253         return status;
 254 }
 255
 256 /* module initialisation */
 257 static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
 258                                     const char *param,
 259                                     auth_methods **auth_method)
 260 {
 261         struct auth_methods *result;
 262
 263         gensec_init();
 264
 265         result = talloc_zero(auth_context, struct auth_methods);
 266         if (result == NULL) {
 267                 return NT_STATUS_NO_MEMORY;
 268         }
 269         result->name = "samba4";
 270         result->auth = check_samba4_security;
 271         result->prepare_gensec = prepare_gensec;
 272         result->make_auth4_context = make_auth4_context_s4;
 273
 274         *auth_method = result;
 275         return NT_STATUS_OK;
 276 }
 277
 278 NTSTATUS auth_samba4_init(void)
 279 {
 280         smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
 281                           auth_init_samba4);
 282         return NT_STATUS_OK;
 283 }