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         io.in.iconv_convenience = lp_iconv_convenience(ctx->auth_ctx->lp_ctx);
  85         lp_smbcli_session_options(ctx->auth_ctx->lp_ctx, &io.in.session_options);
  86
  87         status = smb_composite_connect(&io, mem_ctx, lp_resolve_context(ctx->auth_ctx->lp_ctx),
  88                                        ctx->auth_ctx->event_ctx);
  89         NT_STATUS_NOT_OK_RETURN(status);
  90
  91         if (io.out.tree->session->transport->negotiate.secblob.length != 8) {
  92                 return NT_STATUS_INTERNAL_ERROR;
  93         }
  94         memcpy(chal, io.out.tree->session->transport->negotiate.secblob.data, 8);
  95         ctx->private_data = talloc_steal(ctx, io.out.tree->session);
  96         return NT_STATUS_OK;
  97 }
  98
  99 /**
 100  * Return an error based on username
 101  *
 102  * This function allows the testing of obsure errors, as well as the generation
 103  * of NT_STATUS -> DOS error mapping tables.
 104  *
 105  * This module is of no value to end-users.
 106  *
 107  * The password is ignored.
 108  *
 109  * @return An NTSTATUS value based on the username
 110  **/
 111
 112 static NTSTATUS server_check_password(struct auth_method_context *ctx,
 113                                       TALLOC_CTX *mem_ctx,
 114                                       const struct auth_usersupplied_info *user_info,
 115                                       struct auth_serversupplied_info **_server_info)
 116 {
 117         NTSTATUS nt_status;
 118         struct auth_serversupplied_info *server_info;
 119         struct cli_credentials *creds;
 120         struct smb_composite_sesssetup session_setup;
 121
 122         struct smbcli_session *session = talloc_get_type(ctx->private_data, struct smbcli_session);
 123
 124         creds = cli_credentials_init(mem_ctx);
 125
 126         NT_STATUS_HAVE_NO_MEMORY(creds);
 127
 128         cli_credentials_set_username(creds, user_info->client.account_name, CRED_SPECIFIED);
 129         cli_credentials_set_domain(creds, user_info->client.domain_name, CRED_SPECIFIED);
 130
 131         switch (user_info->password_state) {
 132         case AUTH_PASSWORD_PLAIN:
 133                 cli_credentials_set_password(creds, user_info->password.plaintext,
 134                                              CRED_SPECIFIED);
 135                 break;
 136         case AUTH_PASSWORD_HASH:
 137                 cli_credentials_set_nt_hash(creds, user_info->password.hash.nt,
 138                                             CRED_SPECIFIED);
 139                 break;
 140
 141         case AUTH_PASSWORD_RESPONSE:
 142                 cli_credentials_set_ntlm_response(creds, &user_info->password.response.lanman, &user_info->password.response.nt, CRED_SPECIFIED);
 143                 break;
 144         }
 145
 146         session_setup.in.sesskey = session->transport->negotiate.sesskey;
 147         session_setup.in.capabilities = session->transport->negotiate.capabilities;
 148
 149         session_setup.in.credentials = creds;
 150         session_setup.in.workgroup = ""; /* Only used with SPNEGO, which we are not doing */
 151         session_setup.in.gensec_settings = lp_gensec_settings(session, ctx->auth_ctx->lp_ctx);
 152
 153         /* Check password with remove server - this should be async some day */
 154         nt_status = smb_composite_sesssetup(session, &session_setup);
 155
 156         if (!NT_STATUS_IS_OK(nt_status)) {
 157                 return nt_status;
 158         }
 159
 160         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 161         NT_STATUS_HAVE_NO_MEMORY(server_info);
 162
 163         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
 164         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 165
 166         /* is this correct? */
 167         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
 168         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 169
 170         server_info->n_domain_groups = 0;
 171         server_info->domain_groups = NULL;
 172
 173         /* annoying, but the Anonymous really does have a session key,
 174            and it is all zeros! */
 175         server_info->user_session_key = data_blob(NULL, 0);
 176         server_info->lm_session_key = data_blob(NULL, 0);
 177
 178         server_info->account_name = talloc_strdup(server_info, user_info->client.account_name);
 179         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 180
 181         server_info->domain_name = talloc_strdup(server_info, user_info->client.domain_name);
 182         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 183
 184         server_info->full_name = NULL;
 185
 186         server_info->logon_script = talloc_strdup(server_info, "");
 187         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 188
 189         server_info->profile_path = talloc_strdup(server_info, "");
 190         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 191
 192         server_info->home_directory = talloc_strdup(server_info, "");
 193         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 194
 195         server_info->home_drive = talloc_strdup(server_info, "");
 196         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 197
 198         server_info->last_logon = 0;
 199         server_info->last_logoff = 0;
 200         server_info->acct_expiry = 0;
 201         server_info->last_password_change = 0;
 202         server_info->allow_password_change = 0;
 203         server_info->force_password_change = 0;
 204
 205         server_info->logon_count = 0;
 206         server_info->bad_password_count = 0;
 207
 208         server_info->acct_flags = ACB_NORMAL;
 209
 210         server_info->authenticated = false;
 211
 212         *_server_info = server_info;
 213
 214         return nt_status;
 215 }
 216
 217 static const struct auth_operations server_auth_ops = {
 218         .name           = "server",
 219         .get_challenge  = server_get_challenge,
 220         .want_check     = server_want_check,
 221         .check_password = server_check_password
 222 };
 223
 224 _PUBLIC_ NTSTATUS auth_server_init(void)
 225 {
 226         NTSTATUS ret;
 227
 228         ret = auth_register(&server_auth_ops);
 229         if (!NT_STATUS_IS_OK(ret)) {
 230                 DEBUG(0,("Failed to register 'server' auth backend!\n"));
 231                 return ret;
 232         }
 233
 234         return ret;
 235 }