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 #include "param/param.h"
  31
  32 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, struct winbindd_response *response, struct netr_SamInfo3 *info3)
  33 {
  34         size_t len = response->length - sizeof(struct winbindd_response);
  35         if (len > 4) {
  36                 enum ndr_err_code ndr_err;
  37                 DATA_BLOB blob;
  38                 blob.length = len - 4;
  39                 blob.data = (uint8_t *)(((char *)response->extra_data.data) + 4);
  40
  41                 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx,
  42                                iconv_convenience, info3,
  43                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  44                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  45                         return ndr_map_error2ntstatus(ndr_err);
  46                 }
  47
  48                 return NT_STATUS_OK;
  49         } else {
  50                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  51                 return NT_STATUS_UNSUCCESSFUL;
  52         }
  53 }
  54
  55 static NTSTATUS winbind_want_check(struct auth_method_context *ctx,
  56                                    TALLOC_CTX *mem_ctx,
  57                                    const struct auth_usersupplied_info *user_info)
  58 {
  59         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
  60                 return NT_STATUS_NOT_IMPLEMENTED;
  61         }
  62
  63         /* TODO: maybe limit the user scope to remote users only */
  64         return NT_STATUS_OK;
  65 }
  66
  67 /*
  68  Authenticate a user with a challenge/response
  69  using the samba3 winbind protocol
  70 */
  71 static NTSTATUS winbind_check_password_samba3(struct auth_method_context *ctx,
  72                                               TALLOC_CTX *mem_ctx,
  73                                               const struct auth_usersupplied_info *user_info,
  74                                               struct auth_serversupplied_info **server_info)
  75 {
  76         struct winbindd_request request;
  77         struct winbindd_response response;
  78         NSS_STATUS result;
  79         NTSTATUS nt_status;
  80         struct netr_SamInfo3 info3;
  81
  82         /* Send off request */
  83         const struct auth_usersupplied_info *user_info_temp;
  84         nt_status = encrypt_user_info(mem_ctx, ctx->auth_ctx,
  85                                       AUTH_PASSWORD_RESPONSE,
  86                                       user_info, &user_info_temp);
  87         if (!NT_STATUS_IS_OK(nt_status)) {
  88                 return nt_status;
  89         }
  90         user_info = user_info_temp;
  91
  92         ZERO_STRUCT(request);
  93         ZERO_STRUCT(response);
  94         request.flags = WBFLAG_PAM_INFO3_NDR;
  95
  96         request.data.auth_crap.logon_parameters = user_info->logon_parameters;
  97
  98         safe_strcpy(request.data.auth_crap.user,
  99                        user_info->client.account_name, sizeof(fstring));
 100         safe_strcpy(request.data.auth_crap.domain,
 101                        user_info->client.domain_name, sizeof(fstring));
 102         safe_strcpy(request.data.auth_crap.workstation,
 103                        user_info->workstation_name, sizeof(fstring));
 104
 105         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
 106
 107         request.data.auth_crap.lm_resp_len = MIN(user_info->password.response.lanman.length,
 108                                                  sizeof(request.data.auth_crap.lm_resp));
 109         request.data.auth_crap.nt_resp_len = MIN(user_info->password.response.nt.length,
 110                                                  sizeof(request.data.auth_crap.nt_resp));
 111
 112         memcpy(request.data.auth_crap.lm_resp, user_info->password.response.lanman.data,
 113                request.data.auth_crap.lm_resp_len);
 114         memcpy(request.data.auth_crap.nt_resp, user_info->password.response.nt.data,
 115                request.data.auth_crap.nt_resp_len);
 116
 117         result = winbindd_request_response(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 118
 119         nt_status = NT_STATUS(response.data.auth.nt_status);
 120         NT_STATUS_NOT_OK_RETURN(nt_status);
 121
 122         if (result == NSS_STATUS_SUCCESS && response.extra_data.data) {
 123                 union netr_Validation validation;
 124
 125                 nt_status = get_info3_from_ndr(mem_ctx, lp_iconv_convenience(ctx->auth_ctx->lp_ctx), &response, &info3);
 126                 SAFE_FREE(response.extra_data.data);
 127                 NT_STATUS_NOT_OK_RETURN(nt_status);
 128
 129                 validation.sam3 = &info3;
 130                 nt_status = make_server_info_netlogon_validation(mem_ctx,
 131                                                                  user_info->client.account_name,
 132                                                                  3, &validation,
 133                                                                  server_info);
 134                 return nt_status;
 135         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data.data) {
 136                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 137                           "but did not include the required info3 reply!\n",
 138                           user_info->client.domain_name, user_info->client.account_name));
 139                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 140         } else if (NT_STATUS_IS_OK(nt_status)) {
 141                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 142                           "but no error code is available!\n",
 143                           user_info->client.domain_name, user_info->client.account_name));
 144                 return NT_STATUS_NO_LOGON_SERVERS;
 145         }
 146
 147         return nt_status;
 148 }
 149
 150 struct winbind_check_password_state {
 151         struct winbind_SamLogon req;
 152 };
 153
 154 /*
 155  Authenticate a user with a challenge/response
 156  using IRPC to the winbind task
 157 */
 158 static NTSTATUS winbind_check_password(struct auth_method_context *ctx,
 159                                        TALLOC_CTX *mem_ctx,
 160                                        const struct auth_usersupplied_info *user_info,
 161                                        struct auth_serversupplied_info **server_info)
 162 {
 163         NTSTATUS status;
 164         struct server_id *winbind_servers;
 165         struct winbind_check_password_state *s;
 166         const struct auth_usersupplied_info *user_info_new;
 167         struct netr_IdentityInfo *identity_info;
 168
 169         s = talloc(mem_ctx, struct winbind_check_password_state);
 170         NT_STATUS_HAVE_NO_MEMORY(s);
 171
 172         winbind_servers = irpc_servers_byname(ctx->auth_ctx->msg_ctx, s, "winbind_server");
 173         if ((winbind_servers == NULL) || (winbind_servers[0].id == 0)) {
 174                 DEBUG(0, ("Winbind authentication for [%s]\\[%s] failed, "
 175                           "no winbind_server running!\n",
 176                           user_info->client.domain_name, user_info->client.account_name));
 177                 return NT_STATUS_NO_LOGON_SERVERS;
 178         }
 179
 180         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 181                 struct netr_PasswordInfo *password_info;
 182
 183                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_HASH,
 184                                            user_info, &user_info_new);
 185                 NT_STATUS_NOT_OK_RETURN(status);
 186                 user_info = user_info_new;
 187
 188                 password_info = talloc(s, struct netr_PasswordInfo);
 189                 NT_STATUS_HAVE_NO_MEMORY(password_info);
 190
 191                 password_info->lmpassword = *user_info->password.hash.lanman;
 192                 password_info->ntpassword = *user_info->password.hash.nt;
 193
 194                 identity_info = &password_info->identity_info;
 195                 s->req.in.logon_level   = 1;
 196                 s->req.in.logon.password= password_info;
 197         } else {
 198                 struct netr_NetworkInfo *network_info;
 199                 const uint8_t *challenge;
 200
 201                 status = encrypt_user_info(s, ctx->auth_ctx, AUTH_PASSWORD_RESPONSE,
 202                                            user_info, &user_info_new);
 203                 NT_STATUS_NOT_OK_RETURN(status);
 204                 user_info = user_info_new;
 205
 206                 network_info = talloc(s, struct netr_NetworkInfo);
 207                 NT_STATUS_HAVE_NO_MEMORY(network_info);
 208
 209                 status = auth_get_challenge(ctx->auth_ctx, &challenge);
 210                 NT_STATUS_NOT_OK_RETURN(status);
 211
 212                 memcpy(network_info->challenge, challenge, sizeof(network_info->challenge));
 213
 214                 network_info->nt.length = user_info->password.response.nt.length;
 215                 network_info->nt.data   = user_info->password.response.nt.data;
 216
 217                 network_info->lm.length = user_info->password.response.lanman.length;
 218                 network_info->lm.data   = user_info->password.response.lanman.data;
 219
 220                 identity_info = &network_info->identity_info;
 221                 s->req.in.logon_level   = 2;
 222                 s->req.in.logon.network = network_info;
 223         }
 224
 225         identity_info->domain_name.string       = user_info->client.domain_name;
 226         identity_info->parameter_control        = user_info->logon_parameters; /* see MSV1_0_* */
 227         identity_info->logon_id_low             = 0;
 228         identity_info->logon_id_high            = 0;
 229         identity_info->account_name.string      = user_info->client.account_name;
 230         identity_info->workstation.string       = user_info->workstation_name;
 231
 232         s->req.in.validation_level      = 3;
 233
 234         status = IRPC_CALL(ctx->auth_ctx->msg_ctx, winbind_servers[0],
 235                            winbind, WINBIND_SAMLOGON,
 236                            &s->req, s);
 237         NT_STATUS_NOT_OK_RETURN(status);
 238
 239         status = make_server_info_netlogon_validation(mem_ctx,
 240                                                       user_info->client.account_name,
 241                                                       s->req.in.validation_level,
 242                                                       &s->req.out.validation,
 243                                                       server_info);
 244         NT_STATUS_NOT_OK_RETURN(status);
 245
 246         return NT_STATUS_OK;
 247 }
 248
 249 static const struct auth_operations winbind_samba3_ops = {
 250         .name           = "winbind_samba3",
 251         .get_challenge  = auth_get_challenge_not_implemented,
 252         .want_check     = winbind_want_check,
 253         .check_password = winbind_check_password_samba3
 254 };
 255
 256 static const struct auth_operations winbind_ops = {
 257         .name           = "winbind",
 258         .get_challenge  = auth_get_challenge_not_implemented,
 259         .want_check     = winbind_want_check,
 260         .check_password = winbind_check_password
 261 };
 262
 263 _PUBLIC_ NTSTATUS auth_winbind_init(void)
 264 {
 265         NTSTATUS ret;
 266
 267         ret = auth_register(&winbind_samba3_ops);
 268         if (!NT_STATUS_IS_OK(ret)) {
 269                 DEBUG(0,("Failed to register 'winbind_samba3' auth backend!\n"));
 270                 return ret;
 271         }
 272
 273         ret = auth_register(&winbind_ops);
 274         if (!NT_STATUS_IS_OK(ret)) {
 275                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 276                 return ret;
 277         }
 278
 279         return NT_STATUS_OK;
 280 }