source/auth/auth_winbind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind authentication mechnism
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Andrew Bartlett 2001 - 2002
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth/auth.h"
  26 #include "nsswitch/winbind_client.h"
  27 #include "librpc/gen_ndr/ndr_netlogon.h"
  28 #include "librpc/gen_ndr/ndr_winbind.h"
  29 #include "lib/messaging/irpc.h"
  30
  31 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, struct netr_SamInfo3 *info3)
  32 {
  33         size_t len = response->length - sizeof(struct winbindd_response);
  34         if (len > 4) {
  35                 enum ndr_err_code ndr_err;
  36                 DATA_BLOB blob;
  37                 blob.length = len - 4;
  38                 blob.data = (uint8_t *)(((char *)response->extra_data.data) + 4);
  39
  40                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, info3,
  41                                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  42                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  43                         return ndr_map_error2ntstatus(ndr_err);
  44                 }
  45
  46                 return NT_STATUS_OK;
  47         } else {
  48                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  49                 return NT_STATUS_UNSUCCESSFUL;
  50         }
  51 }
  52
  53 static NTSTATUS winbind_want_check(struct auth_method_context *ctx,
  54                                    TALLOC_CTX *mem_ctx,
  55                                    const struct auth_usersupplied_info *user_info)
  56 {
  57         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
  58                 return NT_STATUS_NOT_IMPLEMENTED;
  59         }
  60
  61         /* TODO: maybe limit the user scope to remote users only */
  62         return NT_STATUS_OK;
  63 }
  64
  65 /*
  66  Authenticate a user with a challenge/response
  67  using the samba3 winbind protocol
  68 */
  69 static NTSTATUS winbind_check_password_samba3(struct auth_method_context *ctx,
  70                                               TALLOC_CTX *mem_ctx,
  71                                               const struct auth_usersupplied_info *user_info,
  72                                               struct auth_serversupplied_info **server_info)
  73 {
  74         struct winbindd_request request;
  75         struct winbindd_response response;
  76         NSS_STATUS result;
  77         NTSTATUS nt_status;
  78         struct netr_SamInfo3 info3;
  79
  80         /* Send off request */
  81         const struct auth_usersupplied_info *user_info_temp;
  82         nt_status = encrypt_user_info(mem_ctx, ctx->auth_ctx,
  83                                       AUTH_PASSWORD_RESPONSE,
  84                                       user_info, &user_info_temp);
  85         if (!NT_STATUS_IS_OK(nt_status)) {
  86                 return nt_status;
  87         }
  88         user_info = user_info_temp;
  89
  90         ZERO_STRUCT(request);
  91         ZERO_STRUCT(response);
  92         request.flags = WBFLAG_PAM_INFO3_NDR;
  93
  94         request.data.auth_crap.logon_parameters = user_info->logon_parameters;
  95
  96         safe_strcpy(request.data.auth_crap.user,
  97                        user_info->client.account_name, sizeof(fstring));
  98         safe_strcpy(request.data.auth_crap.domain,
  99                        user_info->client.domain_name, sizeof(fstring));
 100         safe_strcpy(request.data.auth_crap.workstation,
 101                        user_info->workstation_name, sizeof(fstring));
 102
 103         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
 104
 105         request.data.auth_crap.lm_resp_len = MIN(user_info->password.response.lanman.length,
 106                                                  sizeof(request.data.auth_crap.lm_resp));
 107         request.data.auth_crap.nt_resp_len = MIN(user_info->password.response.nt.length,
 108                                                  sizeof(request.data.auth_crap.nt_resp));
 109
 110         memcpy(request.data.auth_crap.lm_resp, user_info->password.response.lanman.data,
 111                request.data.auth_crap.lm_resp_len);
 112         memcpy(request.data.auth_crap.nt_resp, user_info->password.response.nt.data,
 113                request.data.auth_crap.nt_resp_len);
 114
 115         result = winbindd_request_response(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 116
 117         nt_status = NT_STATUS(response.data.auth.nt_status);
 118         NT_STATUS_NOT_OK_RETURN(nt_status);
 119
 120         if (result == NSS_STATUS_SUCCESS && response.extra_data.data) {
 121                 union netr_Validation validation;
 122
 123                 nt_status = get_info3_from_ndr(mem_ctx, &response, &info3);
 124                 SAFE_FREE(response.extra_data.data);
 125                 NT_STATUS_NOT_OK_RETURN(nt_status);
 126
 127                 validation.sam3 = &info3;
 128                 nt_status = make_server_info_netlogon_validation(mem_ctx,
 129                                                                  user_info->client.account_name,
 130                                                                  3, &validation,
 131                                                                  server_info);
 132                 return nt_status;
 133         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data.data) {
 134                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 135                           "but did not include the required info3 reply!\n",
 136                           user_info->client.domain_name, user_info->client.account_name));
 137                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 138         } else if (NT_STATUS_IS_OK(nt_status)) {
 139                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 140                           "but no error code is available!\n",
 141                           user_info->client.domain_name, user_info->client.account_name));
 142                 return NT_STATUS_NO_LOGON_SERVERS;
 143         }
 144
 145         return nt_status;
 146 }
 147
 148 struct winbind_check_password_state {
 149         struct winbind_SamLogon req;
 150 };
 151
 152 /*
 153  Authenticate a user with a challenge/response
 154  using IRPC to the winbind task
 155 */
 156 static NTSTATUS winbind_check_password(struct auth_method_context *ctx,
 157                                        TALLOC_CTX *mem_ctx,
 158                                        const struct auth_usersupplied_info *user_info,
 159                                        struct auth_serversupplied_info **server_info)
 160 {
 161         NTSTATUS status;
 162         struct server_id *winbind_servers;
 163         struct winbind_check_password_state *s;
 164         const struct auth_usersupplied_info *user_info_new;
 165         struct netr_IdentityInfo *identity_info;
 166
 167         s = talloc(mem_ctx, struct winbind_check_password_state);
 168         NT_STATUS_HAVE_NO_MEMORY(s);
 169
 170         winbind_servers = irpc_servers_byname(ctx->auth_ctx->msg_ctx, s, "winbind_server");
 171         if ((winbind_servers == NULL) || (winbind_servers[0].id == 0)) {
 172                 DEBUG(0, ("Winbind authentication for [%s]\\[%s] failed, "
 173                           "no winbind_server running!\n",
 174                           user_info->client.domain_name, user_info->client.account_name));
 175                 return NT_STATUS_NO_LOGON_SERVERS;
 176         }
 177
 178         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 179                 struct netr_PasswordInfo *password_info;
 180
 181                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_HASH,
 182                                            user_info, &user_info_new);
 183                 NT_STATUS_NOT_OK_RETURN(status);
 184                 user_info = user_info_new;
 185
 186                 password_info = talloc(s, struct netr_PasswordInfo);
 187                 NT_STATUS_HAVE_NO_MEMORY(password_info);
 188
 189                 password_info->lmpassword = *user_info->password.hash.lanman;
 190                 password_info->ntpassword = *user_info->password.hash.nt;
 191
 192                 identity_info = &password_info->identity_info;
 193                 s->req.in.logon_level   = 1;
 194                 s->req.in.logon.password= password_info;
 195         } else {
 196                 struct netr_NetworkInfo *network_info;
 197                 const uint8_t *challenge;
 198
 199                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_RESPONSE,
 200                                            user_info, &user_info_new);
 201                 NT_STATUS_NOT_OK_RETURN(status);
 202                 user_info = user_info_new;
 203
 204                 network_info = talloc(s, struct netr_NetworkInfo);
 205                 NT_STATUS_HAVE_NO_MEMORY(network_info);
 206
 207                 status = auth_get_challenge(ctx->auth_ctx, &challenge);
 208                 NT_STATUS_NOT_OK_RETURN(status);
 209
 210                 memcpy(network_info->challenge, challenge, sizeof(network_info->challenge));
 211
 212                 network_info->nt.length = user_info->password.response.nt.length;
 213                 network_info->nt.data   = user_info->password.response.nt.data;
 214
 215                 network_info->lm.length = user_info->password.response.lanman.length;
 216                 network_info->lm.data   = user_info->password.response.lanman.data;
 217
 218                 identity_info = &network_info->identity_info;
 219                 s->req.in.logon_level   = 2;
 220                 s->req.in.logon.network = network_info;
 221         }
 222
 223         identity_info->domain_name.string       = user_info->client.domain_name;
 224         identity_info->parameter_control        = user_info->logon_parameters; /* see MSV1_0_* */
 225         identity_info->logon_id_low             = 0;
 226         identity_info->logon_id_high            = 0;
 227         identity_info->account_name.string      = user_info->client.account_name;
 228         identity_info->workstation.string       = user_info->workstation_name;
 229
 230         s->req.in.validation_level      = 3;
 231
 232         status = IRPC_CALL(ctx->auth_ctx->msg_ctx, winbind_servers[0],
 233                            winbind, WINBIND_SAMLOGON,
 234                            &s->req, s);
 235         NT_STATUS_NOT_OK_RETURN(status);
 236
 237         status = make_server_info_netlogon_validation(mem_ctx,
 238                                                       user_info->client.account_name,
 239                                                       s->req.in.validation_level,
 240                                                       &s->req.out.validation,
 241                                                       server_info);
 242         NT_STATUS_NOT_OK_RETURN(status);
 243
 244         return NT_STATUS_OK;
 245 }
 246
 247 static const struct auth_operations winbind_samba3_ops = {
 248         .name           = "winbind_samba3",
 249         .get_challenge  = auth_get_challenge_not_implemented,
 250         .want_check     = winbind_want_check,
 251         .check_password = winbind_check_password_samba3
 252 };
 253
 254 static const struct auth_operations winbind_ops = {
 255         .name           = "winbind",
 256         .get_challenge  = auth_get_challenge_not_implemented,
 257         .want_check     = winbind_want_check,
 258         .check_password = winbind_check_password
 259 };
 260
 261 NTSTATUS auth_winbind_init(void)
 262 {
 263         NTSTATUS ret;
 264
 265         ret = auth_register(&winbind_samba3_ops);
 266         if (!NT_STATUS_IS_OK(ret)) {
 267                 DEBUG(0,("Failed to register 'winbind_samba3' auth backend!\n"));
 268                 return ret;
 269         }
 270
 271         ret = auth_register(&winbind_ops);
 272         if (!NT_STATUS_IS_OK(ret)) {
 273                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 274                 return ret;
 275         }
 276
 277         return NT_STATUS_OK;
 278 }