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
 111         lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
 112         if (lp_ctx == NULL) {
 113                 DEBUG(1, ("loadparm_init_s3 failed\n"));
 114                 TALLOC_FREE(frame);
 115                 return NT_STATUS_INVALID_SERVER_STATE;
 116         }
 117         event_ctx = s4_event_context_init(mem_ctx);
 118         if (event_ctx == NULL) {
 119                 DEBUG(1, ("s4_event_context_init failed\n"));
 120                 TALLOC_FREE(frame);
 121                 return NT_STATUS_INVALID_SERVER_STATE;
 122         }
 123
 124         msg_ctx = imessaging_client_init(frame,
 125                                          lp_ctx,
 126                                          event_ctx);
 127         if (msg_ctx == NULL) {
 128                 DEBUG(1, ("imessaging_init failed\n"));
 129                 TALLOC_FREE(frame);
 130                 return NT_STATUS_INVALID_SERVER_STATE;
 131         }
 132
 133         server_credentials
 134                 = cli_credentials_init(frame);
 135         if (!server_credentials) {
 136                 DEBUG(1, ("Failed to init server credentials"));
 137                 TALLOC_FREE(frame);
 138                 return NT_STATUS_INVALID_SERVER_STATE;
 139         }
 140
 141         cli_credentials_set_conf(server_credentials, lp_ctx);
 142         status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
 145                 talloc_free(server_credentials);
 146                 server_credentials = NULL;
 147         }
 148
 149         status = samba_server_gensec_start(mem_ctx,
 150                                            event_ctx, msg_ctx,
 151                                            lp_ctx, server_credentials, "cifs",
 152                                            &gensec_ctx);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 155                 TALLOC_FREE(frame);
 156                 return status;
 157         }
 158
 159         talloc_reparent(frame, gensec_ctx, msg_ctx);
 160         talloc_reparent(frame, gensec_ctx, event_ctx);
 161         talloc_reparent(frame, gensec_ctx, lp_ctx);
 162         talloc_reparent(frame, gensec_ctx, server_credentials);
 163
 164         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 165         gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
 166
 167         *gensec_context = gensec_ctx;
 168         TALLOC_FREE(frame);
 169         return status;
 170 }
 171
 172 /* module initialisation */
 173 static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
 174                                     const char *param,
 175                                     auth_methods **auth_method)
 176 {
 177         struct auth_methods *result;
 178
 179         gensec_init();
 180
 181         result = talloc_zero(auth_context, struct auth_methods);
 182         if (result == NULL) {
 183                 return NT_STATUS_NO_MEMORY;
 184         }
 185         result->name = "samba4";
 186         result->auth = check_samba4_security;
 187         result->prepare_gensec = prepare_gensec;
 188         result->gensec_start_mech_by_oid = gensec_start_mech_by_oid;
 189         result->gensec_start_mech_by_authtype = gensec_start_mech_by_authtype;
 190
 191         *auth_method = result;
 192         return NT_STATUS_OK;
 193 }
 194
 195 NTSTATUS auth_samba4_init(void)
 196 {
 197         smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
 198                           auth_init_samba4);
 199         return NT_STATUS_OK;
 200 }