source4/auth/ntlm/auth_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authenticate by using a remote server
   4    Copyright (C) Andrew Bartlett         2001-2002, 2008
   5    Copyright (C) Jelmer Vernooij              2002
   6    Copyright (C) Stefan Metzmacher            2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "auth/auth.h"
  24 #include "auth/credentials/credentials.h"
  25 #include "libcli/security/security.h"
  26 #include "libcli/smb_composite/smb_composite.h"
  27 #include "param/param.h"
  28 #include "libcli/resolve/resolve.h"
  29
  30 _PUBLIC_ NTSTATUS auth4_server_init(void);
  31
  32 /* This version of 'security=server' rewirtten from scratch for Samba4
  33  * libraries in 2008 */
  34
  35
  36 static NTSTATUS server_want_check(struct auth_method_context *ctx,
  37                                             TALLOC_CTX *mem_ctx,
  38                                             const struct auth_usersupplied_info *user_info)
  39 {
  40         return NT_STATUS_OK;
  41 }
  42 /**
  43  * The challenge from the target server, when operating in security=server
  44  **/
  45 static NTSTATUS server_get_challenge(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, uint8_t chal[8])
  46 {
  47         struct smb_composite_connect io;
  48         struct smbcli_options smb_options;
  49         const char **host_list;
  50         NTSTATUS status;
  51
  52         /* Make a connection to the target server, found by 'password server' in smb.conf */
  53
  54         lpcfg_smbcli_options(ctx->auth_ctx->lp_ctx, &smb_options);
  55
  56         /* Make a negprot, WITHOUT SPNEGO, so we get a challenge nice an easy */
  57         io.in.options.use_spnego = false;
  58
  59         /* Hope we don't get * (the default), as this won't work... */
  60         host_list = lpcfg_passwordserver(ctx->auth_ctx->lp_ctx);
  61         if (!host_list) {
  62                 return NT_STATUS_INTERNAL_ERROR;
  63         }
  64         io.in.dest_host = host_list[0];
  65         if (strequal(io.in.dest_host, "*")) {
  66                 return NT_STATUS_INTERNAL_ERROR;
  67         }
  68         io.in.dest_ports = lpcfg_smb_ports(ctx->auth_ctx->lp_ctx);
  69         io.in.socket_options = lpcfg_socket_options(ctx->auth_ctx->lp_ctx);
  70         io.in.gensec_settings = lpcfg_gensec_settings(mem_ctx, ctx->auth_ctx->lp_ctx);
  71
  72         io.in.called_name = strupper_talloc(mem_ctx, io.in.dest_host);
  73
  74         /* We don't want to get as far as the session setup */
  75         io.in.credentials = cli_credentials_init_anon(mem_ctx);
  76         cli_credentials_set_workstation(io.in.credentials,
  77                                         lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
  78                                         CRED_SPECIFIED);
  79
  80         io.in.service = NULL;
  81
  82         io.in.workgroup = ""; /* only used with SPNEGO, disabled above */
  83
  84         io.in.options = smb_options;
  85
  86         lpcfg_smbcli_session_options(ctx->auth_ctx->lp_ctx, &io.in.session_options);
  87
  88         status = smb_composite_connect(&io, mem_ctx, lpcfg_resolve_context(ctx->auth_ctx->lp_ctx),
  89                                        ctx->auth_ctx->event_ctx);
  90         NT_STATUS_NOT_OK_RETURN(status);
  91
  92         if (io.out.tree->session->transport->negotiate.secblob.length != 8) {
  93                 return NT_STATUS_INTERNAL_ERROR;
  94         }
  95         memcpy(chal, io.out.tree->session->transport->negotiate.secblob.data, 8);
  96         ctx->private_data = talloc_steal(ctx, io.out.tree->session);
  97         return NT_STATUS_OK;
  98 }
  99
 100 /**
 101  * Return an error based on username
 102  *
 103  * This function allows the testing of obsure errors, as well as the generation
 104  * of NT_STATUS -> DOS error mapping tables.
 105  *
 106  * This module is of no value to end-users.
 107  *
 108  * The password is ignored.
 109  *
 110  * @return An NTSTATUS value based on the username
 111  **/
 112
 113 static NTSTATUS server_check_password(struct auth_method_context *ctx,
 114                                       TALLOC_CTX *mem_ctx,
 115                                       const struct auth_usersupplied_info *user_info,
 116                                       struct auth_user_info_dc **_user_info_dc)
 117 {
 118         NTSTATUS nt_status;
 119         struct auth_user_info_dc *user_info_dc;
 120         struct auth_user_info *info;
 121         struct cli_credentials *creds;
 122         struct smb_composite_sesssetup session_setup;
 123
 124         struct smbcli_session *session = talloc_get_type(ctx->private_data, struct smbcli_session);
 125
 126         creds = cli_credentials_init(mem_ctx);
 127
 128         NT_STATUS_HAVE_NO_MEMORY(creds);
 129
 130         cli_credentials_set_username(creds, user_info->client.account_name, CRED_SPECIFIED);
 131         cli_credentials_set_domain(creds, user_info->client.domain_name, CRED_SPECIFIED);
 132
 133         switch (user_info->password_state) {
 134         case AUTH_PASSWORD_PLAIN:
 135                 cli_credentials_set_password(creds, user_info->password.plaintext,
 136                                              CRED_SPECIFIED);
 137                 break;
 138         case AUTH_PASSWORD_HASH:
 139                 cli_credentials_set_nt_hash(creds, user_info->password.hash.nt,
 140                                             CRED_SPECIFIED);
 141                 break;
 142
 143         case AUTH_PASSWORD_RESPONSE:
 144                 cli_credentials_set_ntlm_response(creds, &user_info->password.response.lanman, &user_info->password.response.nt, CRED_SPECIFIED);
 145                 break;
 146         }
 147
 148         session_setup.in.sesskey = session->transport->negotiate.sesskey;
 149         session_setup.in.capabilities = session->transport->negotiate.capabilities;
 150
 151         session_setup.in.credentials = creds;
 152         session_setup.in.workgroup = ""; /* Only used with SPNEGO, which we are not doing */
 153         session_setup.in.gensec_settings = lpcfg_gensec_settings(session, ctx->auth_ctx->lp_ctx);
 154
 155         /* Check password with remove server - this should be async some day */
 156         nt_status = smb_composite_sesssetup(session, &session_setup);
 157
 158         if (!NT_STATUS_IS_OK(nt_status)) {
 159                 return nt_status;
 160         }
 161
 162         user_info_dc = talloc(mem_ctx, struct auth_user_info_dc);
 163         NT_STATUS_HAVE_NO_MEMORY(user_info_dc);
 164
 165         user_info_dc->num_sids = 1;
 166
 167         /* This returns a pointer to a struct dom_sid, which is the
 168          * same as a 1 element list of struct dom_sid */
 169         user_info_dc->sids = dom_sid_parse_talloc(user_info_dc, SID_NT_ANONYMOUS);
 170         NT_STATUS_HAVE_NO_MEMORY(user_info_dc->sids);
 171
 172         /* annoying, but the Anonymous really does have a session key,
 173            and it is all zeros! */
 174         user_info_dc->user_session_key = data_blob(NULL, 0);
 175         user_info_dc->lm_session_key = data_blob(NULL, 0);
 176
 177         user_info_dc->info = info = talloc_zero(user_info_dc, struct auth_user_info);
 178         NT_STATUS_HAVE_NO_MEMORY(user_info_dc->info);
 179
 180         info->account_name = talloc_strdup(user_info_dc, user_info->client.account_name);
 181         NT_STATUS_HAVE_NO_MEMORY(info->account_name);
 182
 183         info->domain_name = talloc_strdup(user_info_dc, user_info->client.domain_name);
 184         NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 185
 186         info->full_name = NULL;
 187
 188         info->logon_script = talloc_strdup(user_info_dc, "");
 189         NT_STATUS_HAVE_NO_MEMORY(info->logon_script);
 190
 191         info->profile_path = talloc_strdup(user_info_dc, "");
 192         NT_STATUS_HAVE_NO_MEMORY(info->profile_path);
 193
 194         info->home_directory = talloc_strdup(user_info_dc, "");
 195         NT_STATUS_HAVE_NO_MEMORY(info->home_directory);
 196
 197         info->home_drive = talloc_strdup(user_info_dc, "");
 198         NT_STATUS_HAVE_NO_MEMORY(info->home_drive);
 199
 200         info->last_logon = 0;
 201         info->last_logoff = 0;
 202         info->acct_expiry = 0;
 203         info->last_password_change = 0;
 204         info->allow_password_change = 0;
 205         info->force_password_change = 0;
 206
 207         info->logon_count = 0;
 208         info->bad_password_count = 0;
 209
 210         info->acct_flags = ACB_NORMAL;
 211
 212         info->authenticated = false;
 213
 214         *_user_info_dc = user_info_dc;
 215
 216         return nt_status;
 217 }
 218
 219 static const struct auth_operations server_auth_ops = {
 220         .name           = "server",
 221         .get_challenge  = server_get_challenge,
 222         .want_check     = server_want_check,
 223         .check_password = server_check_password
 224 };
 225
 226 _PUBLIC_ NTSTATUS auth4_server_init(void)
 227 {
 228         NTSTATUS ret;
 229
 230         ret = auth_register(&server_auth_ops);
 231         if (!NT_STATUS_IS_OK(ret)) {
 232                 DEBUG(0,("Failed to register 'server' auth backend!\n"));
 233                 return ret;
 234         }
 235
 236         return ret;
 237 }