source3/auth/auth_winbind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind authentication mechanism
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Andrew Bartlett 2001 - 2002
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth.h"
  25 #include "passdb.h"
  26 #include "nsswitch/libwbclient/wbclient.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 /* Authenticate a user with a challenge/response */
  32
  33 static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
  34                                        void *my_private_data,
  35                                        TALLOC_CTX *mem_ctx,
  36                                        const struct auth_usersupplied_info *user_info,
  37                                        struct auth_serversupplied_info **server_info)
  38 {
  39         NTSTATUS nt_status;
  40         wbcErr wbc_status;
  41         struct wbcAuthUserParams params;
  42         struct wbcAuthUserInfo *info = NULL;
  43         struct wbcAuthErrorInfo *err = NULL;
  44
  45         ZERO_STRUCT(params);
  46
  47         if (!user_info) {
  48                 return NT_STATUS_INVALID_PARAMETER;
  49         }
  50
  51         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
  52
  53         if (!auth_context) {
  54                 DEBUG(3,("Password for user %s cannot be checked because we have no auth_info to get the challenge from.\n",
  55                          user_info->mapped.account_name));
  56                 return NT_STATUS_INVALID_PARAMETER;
  57         }
  58
  59         if (strequal(user_info->mapped.domain_name, get_global_sam_name())) {
  60                 DEBUG(3,("check_winbind_security: Not using winbind, requested domain [%s] was for this SAM.\n",
  61                         user_info->mapped.domain_name));
  62                 return NT_STATUS_NOT_IMPLEMENTED;
  63         }
  64
  65         /* Send off request */
  66         params.account_name     = user_info->client.account_name;
  67         /*
  68          * We need to send the domain name from the client to the DC. With
  69          * NTLMv2 the domain name is part of the hashed second challenge,
  70          * if we change the domain name, the DC will fail to verify the
  71          * challenge cause we changed the domain name, this is like a
  72          * man in the middle attack.
  73          */
  74         params.domain_name      = user_info->client.domain_name;
  75         params.workstation_name = user_info->workstation_name;
  76
  77         params.flags            = 0;
  78         params.parameter_control= user_info->logon_parameters;
  79
  80         params.level            = WBC_AUTH_USER_LEVEL_RESPONSE;
  81
  82         memcpy(params.password.response.challenge,
  83                auth_context->challenge.data,
  84                sizeof(params.password.response.challenge));
  85
  86         if (user_info->password.response.nt.length != 0) {
  87                 params.password.response.nt_length =
  88                         user_info->password.response.nt.length;
  89                 params.password.response.nt_data =
  90                         user_info->password.response.nt.data;
  91         }
  92         if (user_info->password.response.lanman.length != 0) {
  93                 params.password.response.lm_length =
  94                         user_info->password.response.lanman.length;
  95                 params.password.response.lm_data =
  96                         user_info->password.response.lanman.data;
  97         }
  98
  99         /* we are contacting the privileged pipe */
 100         become_root();
 101         wbc_status = wbcAuthenticateUserEx(&params, &info, &err);
 102         unbecome_root();
 103
 104         if (!WBC_ERROR_IS_OK(wbc_status)) {
 105                 DEBUG(10,("check_winbind_security: wbcAuthenticateUserEx failed: %s\n",
 106                         wbcErrorString(wbc_status)));
 107         }
 108
 109         if (wbc_status == WBC_ERR_NO_MEMORY) {
 110                 return NT_STATUS_NO_MEMORY;
 111         }
 112
 113         if (wbc_status == WBC_ERR_WINBIND_NOT_AVAILABLE) {
 114                 struct pdb_trusted_domain **domains = NULL;
 115                 uint32_t num_domains = 0;
 116                 NTSTATUS status;
 117
 118                 if (lp_server_role() == ROLE_DOMAIN_MEMBER) {
 119                         status = NT_STATUS_NO_LOGON_SERVERS;
 120                         DBG_ERR("winbindd not running - "
 121                                 "but required as domain member: %s\n",
 122                                 nt_errstr(status));
 123                         return status;
 124                 }
 125
 126                 status = pdb_enum_trusted_domains(talloc_tos(), &num_domains, &domains);
 127                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)) {
 128                         DBG_DEBUG("pdb_enum_trusted_domains() not implemented "
 129                                   "for this passdb backend\n");
 130                         return status;
 131                 } else if (!NT_STATUS_IS_OK(status)) {
 132                         DBG_ERR("pdb_enum_trusted_domains() failed - %s\n",
 133                                 nt_errstr(status));
 134                         return status;
 135                 }
 136                 TALLOC_FREE(domains);
 137
 138                 if (num_domains == 0) {
 139                         DBG_DEBUG("winbindd not running - ignoring without "
 140                                   "trusted domains\n");
 141                         return NT_STATUS_NOT_IMPLEMENTED;
 142                 }
 143
 144                 status = NT_STATUS_NO_LOGON_SERVERS;
 145                 DBG_ERR("winbindd not running - "
 146                         "but required as DC with trusts: %s\n",
 147                         nt_errstr(status));
 148                 return status;
 149         }
 150
 151         if (wbc_status == WBC_ERR_AUTH_ERROR) {
 152                 nt_status = NT_STATUS(err->nt_status);
 153
 154                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) &&
 155                     (err->authoritative == 0)) {
 156                         /*
 157                          * Trigger a fallback to local SAM
 158                          */
 159                         nt_status = NT_STATUS_NOT_IMPLEMENTED;
 160                 }
 161
 162                 wbcFreeMemory(err);
 163                 return nt_status;
 164         }
 165
 166         if (!WBC_ERROR_IS_OK(wbc_status)) {
 167                 return NT_STATUS_LOGON_FAILURE;
 168         }
 169
 170         nt_status = make_server_info_wbcAuthUserInfo(mem_ctx,
 171                                                      user_info->client.account_name,
 172                                                      user_info->mapped.domain_name,
 173                                                      info, server_info);
 174         wbcFreeMemory(info);
 175         if (!NT_STATUS_IS_OK(nt_status)) {
 176                 return nt_status;
 177         }
 178
 179         (*server_info)->nss_token |= user_info->was_mapped;
 180
 181         return nt_status;
 182 }
 183
 184 /* module initialisation */
 185 static NTSTATUS auth_init_winbind(
 186         struct auth_context *auth_context,
 187         const char *param,
 188         struct auth_methods **auth_method)
 189 {
 190         struct auth_methods *result;
 191
 192         result = talloc_zero(auth_context, struct auth_methods);
 193         if (result == NULL) {
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196         result->name = "winbind";
 197         result->auth = check_winbind_security;
 198
 199         *auth_method = result;
 200         return NT_STATUS_OK;
 201 }
 202
 203 NTSTATUS auth_winbind_init(TALLOC_CTX *mem_ctx)
 204 {
 205         return smb_register_auth(AUTH_INTERFACE_VERSION, "winbind", auth_init_winbind);
 206 }