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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "auth/auth.h"
  27 #include "nsswitch/winbind_client.h"
  28 #include "librpc/gen_ndr/ndr_netlogon.h"
  29 #include "librpc/gen_ndr/ndr_winbind.h"
  30 #include "lib/messaging/irpc.h"
  31
  32 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, struct netr_SamInfo3 *info3)
  33 {
  34         size_t len = response->length - sizeof(struct winbindd_response);
  35         if (len > 4) {
  36                 NTSTATUS status;
  37                 DATA_BLOB blob;
  38                 blob.length = len - 4;
  39                 blob.data = (uint8_t *)(((char *)response->extra_data) + 4);
  40
  41                 status = ndr_pull_struct_blob(&blob, mem_ctx, info3,
  42                                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  43
  44                 return status;
  45         } else {
  46                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  47                 return NT_STATUS_UNSUCCESSFUL;
  48         }
  49 }
  50
  51 static NTSTATUS winbind_want_check(struct auth_method_context *ctx,
  52                                    TALLOC_CTX *mem_ctx,
  53                                    const struct auth_usersupplied_info *user_info)
  54 {
  55         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
  56                 return NT_STATUS_NOT_IMPLEMENTED;
  57         }
  58
  59         /* TODO: maybe limit the user scope to remote users only */
  60         return NT_STATUS_OK;
  61 }
  62
  63 /*
  64  Authenticate a user with a challenge/response
  65  using the samba3 winbind protocol
  66 */
  67 static NTSTATUS winbind_check_password_samba3(struct auth_method_context *ctx,
  68                                               TALLOC_CTX *mem_ctx,
  69                                               const struct auth_usersupplied_info *user_info,
  70                                               struct auth_serversupplied_info **server_info)
  71 {
  72         struct winbindd_request request;
  73         struct winbindd_response response;
  74         NSS_STATUS result;
  75         NTSTATUS nt_status;
  76         struct netr_SamInfo3 info3;
  77
  78         /* Send off request */
  79         const struct auth_usersupplied_info *user_info_temp;
  80         nt_status = encrypt_user_info(mem_ctx, ctx->auth_ctx,
  81                                       AUTH_PASSWORD_RESPONSE,
  82                                       user_info, &user_info_temp);
  83         if (!NT_STATUS_IS_OK(nt_status)) {
  84                 return nt_status;
  85         }
  86         user_info = user_info_temp;
  87
  88         ZERO_STRUCT(request);
  89         ZERO_STRUCT(response);
  90         request.flags = WBFLAG_PAM_INFO3_NDR;
  91
  92         request.data.auth_crap.logon_parameters = user_info->logon_parameters;
  93
  94         winbind_strcpy(request.data.auth_crap.user,
  95                        user_info->client.account_name);
  96         winbind_strcpy(request.data.auth_crap.domain,
  97                        user_info->client.domain_name);
  98         winbind_strcpy(request.data.auth_crap.workstation,
  99                        user_info->workstation_name);
 100
 101         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
 102
 103         request.data.auth_crap.lm_resp_len = MIN(user_info->password.response.lanman.length,
 104                                                  sizeof(request.data.auth_crap.lm_resp));
 105         request.data.auth_crap.nt_resp_len = MIN(user_info->password.response.nt.length,
 106                                                  sizeof(request.data.auth_crap.nt_resp));
 107
 108         memcpy(request.data.auth_crap.lm_resp, user_info->password.response.lanman.data,
 109                request.data.auth_crap.lm_resp_len);
 110         memcpy(request.data.auth_crap.nt_resp, user_info->password.response.nt.data,
 111                request.data.auth_crap.nt_resp_len);
 112
 113         result = winbindd_request(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 114
 115         nt_status = NT_STATUS(response.data.auth.nt_status);
 116         NT_STATUS_NOT_OK_RETURN(nt_status);
 117
 118         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
 119                 union netr_Validation validation;
 120
 121                 nt_status = get_info3_from_ndr(mem_ctx, &response, &info3);
 122                 SAFE_FREE(response.extra_data);
 123                 NT_STATUS_NOT_OK_RETURN(nt_status);
 124
 125                 validation.sam3 = &info3;
 126                 nt_status = make_server_info_netlogon_validation(mem_ctx,
 127                                                                  user_info->client.account_name,
 128                                                                  3, &validation,
 129                                                                  server_info);
 130                 return nt_status;
 131         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data) {
 132                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 133                           "but did not include the required info3 reply!\n",
 134                           user_info->client.domain_name, user_info->client.account_name));
 135                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 136         } else if (NT_STATUS_IS_OK(nt_status)) {
 137                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 138                           "but no error code is available!\n",
 139                           user_info->client.domain_name, user_info->client.account_name));
 140                 return NT_STATUS_NO_LOGON_SERVERS;
 141         }
 142
 143         return nt_status;
 144 }
 145
 146 struct winbind_check_password_state {
 147         struct winbind_SamLogon req;
 148 };
 149
 150 /*
 151  Authenticate a user with a challenge/response
 152  using IRPC to the winbind task
 153 */
 154 static NTSTATUS winbind_check_password(struct auth_method_context *ctx,
 155                                        TALLOC_CTX *mem_ctx,
 156                                        const struct auth_usersupplied_info *user_info,
 157                                        struct auth_serversupplied_info **server_info)
 158 {
 159         NTSTATUS status;
 160         struct server_id *winbind_servers;
 161         struct winbind_check_password_state *s;
 162         const struct auth_usersupplied_info *user_info_new;
 163         struct netr_IdentityInfo *identity_info;
 164
 165         s = talloc(mem_ctx, struct winbind_check_password_state);
 166         NT_STATUS_HAVE_NO_MEMORY(s);
 167
 168         winbind_servers = irpc_servers_byname(ctx->auth_ctx->msg_ctx, s, "winbind_server");
 169         if ((winbind_servers == NULL) || (winbind_servers[0].id == 0)) {
 170                 DEBUG(0, ("Winbind authentication for [%s]\\[%s] failed, "
 171                           "no winbind_server running!\n",
 172                           user_info->client.domain_name, user_info->client.account_name));
 173                 return NT_STATUS_NO_LOGON_SERVERS;
 174         }
 175
 176         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 177                 struct netr_PasswordInfo *password_info;
 178
 179                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_HASH,
 180                                            user_info, &user_info_new);
 181                 NT_STATUS_NOT_OK_RETURN(status);
 182                 user_info = user_info_new;
 183
 184                 password_info = talloc(s, struct netr_PasswordInfo);
 185                 NT_STATUS_HAVE_NO_MEMORY(password_info);
 186
 187                 password_info->lmpassword = *user_info->password.hash.lanman;
 188                 password_info->ntpassword = *user_info->password.hash.nt;
 189
 190                 identity_info = &password_info->identity_info;
 191                 s->req.in.logon_level   = 1;
 192                 s->req.in.logon.password= password_info;
 193         } else {
 194                 struct netr_NetworkInfo *network_info;
 195                 const uint8_t *challenge;
 196
 197                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_RESPONSE,
 198                                            user_info, &user_info_new);
 199                 NT_STATUS_NOT_OK_RETURN(status);
 200                 user_info = user_info_new;
 201
 202                 network_info = talloc(s, struct netr_NetworkInfo);
 203                 NT_STATUS_HAVE_NO_MEMORY(network_info);
 204
 205                 status = auth_get_challenge(ctx->auth_ctx, &challenge);
 206                 NT_STATUS_NOT_OK_RETURN(status);
 207
 208                 memcpy(network_info->challenge, challenge, sizeof(network_info->challenge));
 209
 210                 network_info->nt.length = user_info->password.response.nt.length;
 211                 network_info->nt.data   = user_info->password.response.nt.data;
 212
 213                 network_info->lm.length = user_info->password.response.lanman.length;
 214                 network_info->lm.data   = user_info->password.response.lanman.data;
 215
 216                 identity_info = &network_info->identity_info;
 217                 s->req.in.logon_level   = 2;
 218                 s->req.in.logon.network = network_info;
 219         }
 220
 221         identity_info->domain_name.string       = user_info->client.domain_name;
 222         identity_info->parameter_control        = user_info->logon_parameters; /* see MSV1_0_* */
 223         identity_info->logon_id_low             = 0;
 224         identity_info->logon_id_high            = 0;
 225         identity_info->account_name.string      = user_info->client.account_name;
 226         identity_info->workstation.string       = user_info->workstation_name;
 227
 228         s->req.in.validation_level      = 3;
 229
 230         status = IRPC_CALL(ctx->auth_ctx->msg_ctx, winbind_servers[0],
 231                            winbind, WINBIND_SAMLOGON,
 232                            &s->req, s);
 233         NT_STATUS_NOT_OK_RETURN(status);
 234
 235         status = make_server_info_netlogon_validation(mem_ctx,
 236                                                       user_info->client.account_name,
 237                                                       s->req.in.validation_level,
 238                                                       &s->req.out.validation,
 239                                                       server_info);
 240         NT_STATUS_NOT_OK_RETURN(status);
 241
 242         return NT_STATUS_OK;
 243 }
 244
 245 static const struct auth_operations winbind_samba3_ops = {
 246         .name           = "winbind_samba3",
 247         .get_challenge  = auth_get_challenge_not_implemented,
 248         .want_check     = winbind_want_check,
 249         .check_password = winbind_check_password_samba3
 250 };
 251
 252 static const struct auth_operations winbind_ops = {
 253         .name           = "winbind",
 254         .get_challenge  = auth_get_challenge_not_implemented,
 255         .want_check     = winbind_want_check,
 256         .check_password = winbind_check_password
 257 };
 258
 259 NTSTATUS auth_winbind_init(void)
 260 {
 261         NTSTATUS ret;
 262
 263         ret = auth_register(&winbind_samba3_ops);
 264         if (!NT_STATUS_IS_OK(ret)) {
 265                 DEBUG(0,("Failed to register 'winbind_samba3' auth backend!\n"));
 266                 return ret;
 267         }
 268
 269         ret = auth_register(&winbind_ops);
 270         if (!NT_STATUS_IS_OK(ret)) {
 271                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 272                 return ret;
 273         }
 274
 275         return NT_STATUS_OK;
 276 }