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 /* This version of 'security=server' rewirtten from scratch for Samba4
  31  * libraries in 2008 */
  32
  33
  34 static NTSTATUS server_want_check(struct auth_method_context *ctx,
  35                                             TALLOC_CTX *mem_ctx,
  36                                             const struct auth_usersupplied_info *user_info)
  37 {
  38         return NT_STATUS_OK;
  39 }
  40 /**
  41  * The challenge from the target server, when operating in security=server
  42  **/
  43 static NTSTATUS server_get_challenge(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, uint8_t chal[8])
  44 {
  45         struct smb_composite_connect io;
  46         struct smbcli_options smb_options;
  47         const char **host_list;
  48         NTSTATUS status;
  49
  50         /* Make a connection to the target server, found by 'password server' in smb.conf */
  51
  52         lp_smbcli_options(ctx->auth_ctx->lp_ctx, &smb_options);
  53
  54         /* Make a negprot, WITHOUT SPNEGO, so we get a challenge nice an easy */
  55         io.in.options.use_spnego = false;
  56
  57         /* Hope we don't get * (the default), as this won't work... */
  58         host_list = lp_passwordserver(ctx->auth_ctx->lp_ctx);
  59         if (!host_list) {
  60                 return NT_STATUS_INTERNAL_ERROR;
  61         }
  62         io.in.dest_host = host_list[0];
  63         if (strequal(io.in.dest_host, "*")) {
  64                 return NT_STATUS_INTERNAL_ERROR;
  65         }
  66         io.in.dest_ports = lp_smb_ports(ctx->auth_ctx->lp_ctx);
  67         io.in.socket_options = lp_socket_options(ctx->auth_ctx->lp_ctx);
  68         io.in.gensec_settings = lp_gensec_settings(mem_ctx, ctx->auth_ctx->lp_ctx);
  69
  70         io.in.called_name = strupper_talloc(mem_ctx, io.in.dest_host);
  71
  72         /* We don't want to get as far as the session setup */
  73         io.in.credentials = cli_credentials_init_anon(mem_ctx);
  74         cli_credentials_set_workstation(io.in.credentials,
  75                                         lp_netbios_name(ctx->auth_ctx->lp_ctx),
  76                                         CRED_SPECIFIED);
  77
  78         io.in.service = NULL;
  79
  80         io.in.workgroup = ""; /* only used with SPNEGO, disabled above */
  81
  82         io.in.options = smb_options;
  83
  84         lp_smbcli_session_options(ctx->auth_ctx->lp_ctx, &io.in.session_options);
  85
  86         status = smb_composite_connect(&io, mem_ctx, lp_resolve_context(ctx->auth_ctx->lp_ctx),
  87                                        ctx->auth_ctx->event_ctx);
  88         NT_STATUS_NOT_OK_RETURN(status);
  89
  90         if (io.out.tree->session->transport->negotiate.secblob.length != 8) {
  91                 return NT_STATUS_INTERNAL_ERROR;
  92         }
  93         memcpy(chal, io.out.tree->session->transport->negotiate.secblob.data, 8);
  94         ctx->private_data = talloc_steal(ctx, io.out.tree->session);
  95         return NT_STATUS_OK;
  96 }
  97
  98 /**
  99  * Return an error based on username
 100  *
 101  * This function allows the testing of obsure errors, as well as the generation
 102  * of NT_STATUS -> DOS error mapping tables.
 103  *
 104  * This module is of no value to end-users.
 105  *
 106  * The password is ignored.
 107  *
 108  * @return An NTSTATUS value based on the username
 109  **/
 110
 111 static NTSTATUS server_check_password(struct auth_method_context *ctx,
 112                                       TALLOC_CTX *mem_ctx,
 113                                       const struct auth_usersupplied_info *user_info,
 114                                       struct auth_serversupplied_info **_server_info)
 115 {
 116         NTSTATUS nt_status;
 117         struct auth_serversupplied_info *server_info;
 118         struct cli_credentials *creds;
 119         struct smb_composite_sesssetup session_setup;
 120
 121         struct smbcli_session *session = talloc_get_type(ctx->private_data, struct smbcli_session);
 122
 123         creds = cli_credentials_init(mem_ctx);
 124
 125         NT_STATUS_HAVE_NO_MEMORY(creds);
 126
 127         cli_credentials_set_username(creds, user_info->client.account_name, CRED_SPECIFIED);
 128         cli_credentials_set_domain(creds, user_info->client.domain_name, CRED_SPECIFIED);
 129
 130         switch (user_info->password_state) {
 131         case AUTH_PASSWORD_PLAIN:
 132                 cli_credentials_set_password(creds, user_info->password.plaintext,
 133                                              CRED_SPECIFIED);
 134                 break;
 135         case AUTH_PASSWORD_HASH:
 136                 cli_credentials_set_nt_hash(creds, user_info->password.hash.nt,
 137                                             CRED_SPECIFIED);
 138                 break;
 139
 140         case AUTH_PASSWORD_RESPONSE:
 141                 cli_credentials_set_ntlm_response(creds, &user_info->password.response.lanman, &user_info->password.response.nt, CRED_SPECIFIED);
 142                 break;
 143         }
 144
 145         session_setup.in.sesskey = session->transport->negotiate.sesskey;
 146         session_setup.in.capabilities = session->transport->negotiate.capabilities;
 147
 148         session_setup.in.credentials = creds;
 149         session_setup.in.workgroup = ""; /* Only used with SPNEGO, which we are not doing */
 150         session_setup.in.gensec_settings = lp_gensec_settings(session, ctx->auth_ctx->lp_ctx);
 151
 152         /* Check password with remove server - this should be async some day */
 153         nt_status = smb_composite_sesssetup(session, &session_setup);
 154
 155         if (!NT_STATUS_IS_OK(nt_status)) {
 156                 return nt_status;
 157         }
 158
 159         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 160         NT_STATUS_HAVE_NO_MEMORY(server_info);
 161
 162         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
 163         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 164
 165         /* is this correct? */
 166         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
 167         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 168
 169         server_info->n_domain_groups = 0;
 170         server_info->domain_groups = NULL;
 171
 172         /* annoying, but the Anonymous really does have a session key,
 173            and it is all zeros! */
 174         server_info->user_session_key = data_blob(NULL, 0);
 175         server_info->lm_session_key = data_blob(NULL, 0);
 176
 177         server_info->account_name = talloc_strdup(server_info, user_info->client.account_name);
 178         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 179
 180         server_info->domain_name = talloc_strdup(server_info, user_info->client.domain_name);
 181         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 182
 183         server_info->full_name = NULL;
 184
 185         server_info->logon_script = talloc_strdup(server_info, "");
 186         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 187
 188         server_info->profile_path = talloc_strdup(server_info, "");
 189         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 190
 191         server_info->home_directory = talloc_strdup(server_info, "");
 192         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 193
 194         server_info->home_drive = talloc_strdup(server_info, "");
 195         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 196
 197         server_info->last_logon = 0;
 198         server_info->last_logoff = 0;
 199         server_info->acct_expiry = 0;
 200         server_info->last_password_change = 0;
 201         server_info->allow_password_change = 0;
 202         server_info->force_password_change = 0;
 203
 204         server_info->logon_count = 0;
 205         server_info->bad_password_count = 0;
 206
 207         server_info->acct_flags = ACB_NORMAL;
 208
 209         server_info->authenticated = false;
 210
 211         *_server_info = server_info;
 212
 213         return nt_status;
 214 }
 215
 216 static const struct auth_operations server_auth_ops = {
 217         .name           = "server",
 218         .get_challenge  = server_get_challenge,
 219         .want_check     = server_want_check,
 220         .check_password = server_check_password
 221 };
 222
 223 _PUBLIC_ NTSTATUS auth_server_init(void)
 224 {
 225         NTSTATUS ret;
 226
 227         ret = auth_register(&server_auth_ops);
 228         if (!NT_STATUS_IS_OK(ret)) {
 229                 DEBUG(0,("Failed to register 'server' auth backend!\n"));
 230                 return ret;
 231         }
 232
 233         return ret;
 234 }