source4/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                 NTSTATUS status;
  36                 DATA_BLOB blob;
  37                 blob.length = len - 4;
  38                 blob.data = (uint8_t *)(((char *)response->extra_data.data) + 4);
  39
  40                 status = ndr_pull_struct_blob(&blob, mem_ctx, info3,
  41                                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  42
  43                 return status;
  44         } else {
  45                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  46                 return NT_STATUS_UNSUCCESSFUL;
  47         }
  48 }
  49
  50 static NTSTATUS winbind_want_check(struct auth_method_context *ctx,
  51                                    TALLOC_CTX *mem_ctx,
  52                                    const struct auth_usersupplied_info *user_info)
  53 {
  54         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
  55                 return NT_STATUS_NOT_IMPLEMENTED;
  56         }
  57
  58         /* TODO: maybe limit the user scope to remote users only */
  59         return NT_STATUS_OK;
  60 }
  61
  62 /*
  63  Authenticate a user with a challenge/response
  64  using the samba3 winbind protocol
  65 */
  66 static NTSTATUS winbind_check_password_samba3(struct auth_method_context *ctx,
  67                                               TALLOC_CTX *mem_ctx,
  68                                               const struct auth_usersupplied_info *user_info,
  69                                               struct auth_serversupplied_info **server_info)
  70 {
  71         struct winbindd_request request;
  72         struct winbindd_response response;
  73         NSS_STATUS result;
  74         NTSTATUS nt_status;
  75         struct netr_SamInfo3 info3;
  76
  77         /* Send off request */
  78         const struct auth_usersupplied_info *user_info_temp;
  79         nt_status = encrypt_user_info(mem_ctx, ctx->auth_ctx,
  80                                       AUTH_PASSWORD_RESPONSE,
  81                                       user_info, &user_info_temp);
  82         if (!NT_STATUS_IS_OK(nt_status)) {
  83                 return nt_status;
  84         }
  85         user_info = user_info_temp;
  86
  87         ZERO_STRUCT(request);
  88         ZERO_STRUCT(response);
  89         request.flags = WBFLAG_PAM_INFO3_NDR;
  90
  91         request.data.auth_crap.logon_parameters = user_info->logon_parameters;
  92
  93         safe_strcpy(request.data.auth_crap.user,
  94                        user_info->client.account_name, sizeof(fstring));
  95         safe_strcpy(request.data.auth_crap.domain,
  96                        user_info->client.domain_name, sizeof(fstring));
  97         safe_strcpy(request.data.auth_crap.workstation,
  98                        user_info->workstation_name, sizeof(fstring));
  99
 100         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
 101
 102         request.data.auth_crap.lm_resp_len = MIN(user_info->password.response.lanman.length,
 103                                                  sizeof(request.data.auth_crap.lm_resp));
 104         request.data.auth_crap.nt_resp_len = MIN(user_info->password.response.nt.length,
 105                                                  sizeof(request.data.auth_crap.nt_resp));
 106
 107         memcpy(request.data.auth_crap.lm_resp, user_info->password.response.lanman.data,
 108                request.data.auth_crap.lm_resp_len);
 109         memcpy(request.data.auth_crap.nt_resp, user_info->password.response.nt.data,
 110                request.data.auth_crap.nt_resp_len);
 111
 112         result = winbindd_request_response(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 113
 114         nt_status = NT_STATUS(response.data.auth.nt_status);
 115         NT_STATUS_NOT_OK_RETURN(nt_status);
 116
 117         if (result == NSS_STATUS_SUCCESS && response.extra_data.data) {
 118                 union netr_Validation validation;
 119
 120                 nt_status = get_info3_from_ndr(mem_ctx, &response, &info3);
 121                 SAFE_FREE(response.extra_data.data);
 122                 NT_STATUS_NOT_OK_RETURN(nt_status);
 123
 124                 validation.sam3 = &info3;
 125                 nt_status = make_server_info_netlogon_validation(mem_ctx,
 126                                                                  user_info->client.account_name,
 127                                                                  3, &validation,
 128                                                                  server_info);
 129                 return nt_status;
 130         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data.data) {
 131                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 132                           "but did not include the required info3 reply!\n",
 133                           user_info->client.domain_name, user_info->client.account_name));
 134                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 135         } else if (NT_STATUS_IS_OK(nt_status)) {
 136                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 137                           "but no error code is available!\n",
 138                           user_info->client.domain_name, user_info->client.account_name));
 139                 return NT_STATUS_NO_LOGON_SERVERS;
 140         }
 141
 142         return nt_status;
 143 }
 144
 145 struct winbind_check_password_state {
 146         struct winbind_SamLogon req;
 147 };
 148
 149 /*
 150  Authenticate a user with a challenge/response
 151  using IRPC to the winbind task
 152 */
 153 static NTSTATUS winbind_check_password(struct auth_method_context *ctx,
 154                                        TALLOC_CTX *mem_ctx,
 155                                        const struct auth_usersupplied_info *user_info,
 156                                        struct auth_serversupplied_info **server_info)
 157 {
 158         NTSTATUS status;
 159         struct server_id *winbind_servers;
 160         struct winbind_check_password_state *s;
 161         const struct auth_usersupplied_info *user_info_new;
 162         struct netr_IdentityInfo *identity_info;
 163
 164         s = talloc(mem_ctx, struct winbind_check_password_state);
 165         NT_STATUS_HAVE_NO_MEMORY(s);
 166
 167         winbind_servers = irpc_servers_byname(ctx->auth_ctx->msg_ctx, s, "winbind_server");
 168         if ((winbind_servers == NULL) || (winbind_servers[0].id == 0)) {
 169                 DEBUG(0, ("Winbind authentication for [%s]\\[%s] failed, "
 170                           "no winbind_server running!\n",
 171                           user_info->client.domain_name, user_info->client.account_name));
 172                 return NT_STATUS_NO_LOGON_SERVERS;
 173         }
 174
 175         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 176                 struct netr_PasswordInfo *password_info;
 177
 178                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_HASH,
 179                                            user_info, &user_info_new);
 180                 NT_STATUS_NOT_OK_RETURN(status);
 181                 user_info = user_info_new;
 182
 183                 password_info = talloc(s, struct netr_PasswordInfo);
 184                 NT_STATUS_HAVE_NO_MEMORY(password_info);
 185
 186                 password_info->lmpassword = *user_info->password.hash.lanman;
 187                 password_info->ntpassword = *user_info->password.hash.nt;
 188
 189                 identity_info = &password_info->identity_info;
 190                 s->req.in.logon_level   = 1;
 191                 s->req.in.logon.password= password_info;
 192         } else {
 193                 struct netr_NetworkInfo *network_info;
 194                 const uint8_t *challenge;
 195
 196                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_RESPONSE,
 197                                            user_info, &user_info_new);
 198                 NT_STATUS_NOT_OK_RETURN(status);
 199                 user_info = user_info_new;
 200
 201                 network_info = talloc(s, struct netr_NetworkInfo);
 202                 NT_STATUS_HAVE_NO_MEMORY(network_info);
 203
 204                 status = auth_get_challenge(ctx->auth_ctx, &challenge);
 205                 NT_STATUS_NOT_OK_RETURN(status);
 206
 207                 memcpy(network_info->challenge, challenge, sizeof(network_info->challenge));
 208
 209                 network_info->nt.length = user_info->password.response.nt.length;
 210                 network_info->nt.data   = user_info->password.response.nt.data;
 211
 212                 network_info->lm.length = user_info->password.response.lanman.length;
 213                 network_info->lm.data   = user_info->password.response.lanman.data;
 214
 215                 identity_info = &network_info->identity_info;
 216                 s->req.in.logon_level   = 2;
 217                 s->req.in.logon.network = network_info;
 218         }
 219
 220         identity_info->domain_name.string       = user_info->client.domain_name;
 221         identity_info->parameter_control        = user_info->logon_parameters; /* see MSV1_0_* */
 222         identity_info->logon_id_low             = 0;
 223         identity_info->logon_id_high            = 0;
 224         identity_info->account_name.string      = user_info->client.account_name;
 225         identity_info->workstation.string       = user_info->workstation_name;
 226
 227         s->req.in.validation_level      = 3;
 228
 229         status = IRPC_CALL(ctx->auth_ctx->msg_ctx, winbind_servers[0],
 230                            winbind, WINBIND_SAMLOGON,
 231                            &s->req, s);
 232         NT_STATUS_NOT_OK_RETURN(status);
 233
 234         status = make_server_info_netlogon_validation(mem_ctx,
 235                                                       user_info->client.account_name,
 236                                                       s->req.in.validation_level,
 237                                                       &s->req.out.validation,
 238                                                       server_info);
 239         NT_STATUS_NOT_OK_RETURN(status);
 240
 241         return NT_STATUS_OK;
 242 }
 243
 244 static const struct auth_operations winbind_samba3_ops = {
 245         .name           = "winbind_samba3",
 246         .get_challenge  = auth_get_challenge_not_implemented,
 247         .want_check     = winbind_want_check,
 248         .check_password = winbind_check_password_samba3
 249 };
 250
 251 static const struct auth_operations winbind_ops = {
 252         .name           = "winbind",
 253         .get_challenge  = auth_get_challenge_not_implemented,
 254         .want_check     = winbind_want_check,
 255         .check_password = winbind_check_password
 256 };
 257
 258 NTSTATUS auth_winbind_init(void)
 259 {
 260         NTSTATUS ret;
 261
 262         ret = auth_register(&winbind_samba3_ops);
 263         if (!NT_STATUS_IS_OK(ret)) {
 264                 DEBUG(0,("Failed to register 'winbind_samba3' auth backend!\n"));
 265                 return ret;
 266         }
 267
 268         ret = auth_register(&winbind_ops);
 269         if (!NT_STATUS_IS_OK(ret)) {
 270                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 271                 return ret;
 272         }
 273
 274         return NT_STATUS_OK;
 275 }