source/auth/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell              1992-2000
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   6    Copyright (C) Andrew Bartlett              2001-2003
   7    Copyright (C) Gerald Carter                2003
   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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_AUTH
  28
  29 /****************************************************************************
  30  Do a specific test for an smb password being correct, given a smb_password and
  31  the lanman and NT responses.
  32 ****************************************************************************/
  33
  34 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
  35                                 TALLOC_CTX *mem_ctx,
  36                                 SAM_ACCOUNT *sampass,
  37                                 const auth_usersupplied_info *user_info,
  38                                 DATA_BLOB *user_sess_key,
  39                                 DATA_BLOB *lm_sess_key)
  40 {
  41         uint16 acct_ctrl;
  42         const uint8 *lm_pw, *nt_pw;
  43         const char *username = pdb_get_username(sampass);
  44
  45         acct_ctrl = pdb_get_acct_ctrl(sampass);
  46         if (acct_ctrl & ACB_PWNOTREQ) {
  47                 if (lp_null_passwords()) {
  48                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
  49                         return NT_STATUS_OK;
  50                 } else {
  51                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
  52                         return NT_STATUS_LOGON_FAILURE;
  53                 }
  54         }
  55
  56         lm_pw = pdb_get_lanman_passwd(sampass);
  57         nt_pw = pdb_get_nt_passwd(sampass);
  58
  59         return ntlm_password_check(mem_ctx, &auth_context->challenge,
  60                                    &user_info->lm_resp, &user_info->nt_resp,
  61                                    &user_info->lm_interactive_pwd, &user_info->nt_interactive_pwd,
  62                                    username,
  63                                    user_info->smb_name.str,
  64                                    user_info->client_domain.str,
  65                                    lm_pw, nt_pw, user_sess_key, lm_sess_key);
  66 }
  67
  68
  69 /****************************************************************************
  70  Do a specific test for a SAM_ACCOUNT being vaild for this connection
  71  (ie not disabled, expired and the like).
  72 ****************************************************************************/
  73
  74 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
  75                                SAM_ACCOUNT *sampass,
  76                                const auth_usersupplied_info *user_info)
  77 {
  78         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
  79         char *workstation_list;
  80         time_t kickoff_time;
  81
  82         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
  83
  84         /* Quit if the account was disabled. */
  85         if (acct_ctrl & ACB_DISABLED) {
  86                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
  87                 return NT_STATUS_ACCOUNT_DISABLED;
  88         }
  89
  90         /* Quit if the account was locked out. */
  91         if (acct_ctrl & ACB_AUTOLOCK) {
  92                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
  93                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
  94         }
  95
  96         /* Test account expire time */
  97
  98         kickoff_time = pdb_get_kickoff_time(sampass);
  99         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 100                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 101                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 102                 return NT_STATUS_ACCOUNT_EXPIRED;
 103         }
 104
 105         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 106                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 107                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 108
 109                 /* check for immediate expiry "must change at next logon" */
 110                 if (must_change_time == 0 && last_set_time != 0) {
 111                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 112                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 113                 }
 114
 115                 /* check for expired password */
 116                 if (must_change_time < time(NULL) && must_change_time != 0) {
 117                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 118                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", timestring(mem_ctx, must_change_time), (long)must_change_time));
 119                         return NT_STATUS_PASSWORD_EXPIRED;
 120                 }
 121         }
 122
 123         /* Test workstation. Workstation list is comma separated. */
 124
 125         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 126         if (!workstation_list)
 127                 return NT_STATUS_NO_MEMORY;
 128
 129         if (*workstation_list) {
 130                 BOOL invalid_ws = True;
 131                 const char *s = workstation_list;
 132
 133                 fstring tok;
 134
 135                 while (next_token(&s, tok, ",", sizeof(tok))) {
 136                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
 137                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 138                         if(strequal(tok, user_info->wksta_name.str)) {
 139                                 invalid_ws = False;
 140                                 break;
 141                         }
 142                 }
 143
 144                 if (invalid_ws)
 145                         return NT_STATUS_INVALID_WORKSTATION;
 146         }
 147
 148         if (acct_ctrl & ACB_DOMTRUST) {
 149                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 150                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 151         }
 152
 153         if (acct_ctrl & ACB_SVRTRUST) {
 154                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 155                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 156         }
 157
 158         if (acct_ctrl & ACB_WSTRUST) {
 159                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 160                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 161         }
 162
 163         return NT_STATUS_OK;
 164 }
 165
 166 /****************************************************************************
 167 check if a username/password is OK assuming the password is a 24 byte
 168 SMB hash supplied in the user_info structure
 169 return an NT_STATUS constant.
 170 ****************************************************************************/
 171
 172 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 173                                    void *my_private_data,
 174                                    TALLOC_CTX *mem_ctx,
 175                                    const auth_usersupplied_info *user_info,
 176                                    auth_serversupplied_info **server_info)
 177 {
 178         SAM_ACCOUNT *sampass=NULL;
 179         BOOL ret;
 180         NTSTATUS nt_status;
 181         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 182         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 183
 184         if (!user_info || !auth_context) {
 185                 return NT_STATUS_UNSUCCESSFUL;
 186         }
 187
 188         /* Can't use the talloc version here, because the returned struct gets
 189            kept on the server_info */
 190         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 191                 return nt_status;
 192         }
 193
 194         /* get the account information */
 195
 196         become_root();
 197         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 198         unbecome_root();
 199
 200         if (ret == False) {
 201                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 202                 pdb_free_sam(&sampass);
 203                 return NT_STATUS_NO_SUCH_USER;
 204         }
 205
 206         /* Quit if the account was locked out. */
 207         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 208                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 209                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 210         }
 211
 212         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 213                                     user_info, &user_sess_key, &lm_sess_key);
 214
 215         if (!NT_STATUS_IS_OK(nt_status)) {
 216                 pdb_free_sam(&sampass);
 217                 return nt_status;
 218         }
 219
 220         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 221
 222         if (!NT_STATUS_IS_OK(nt_status)) {
 223                 pdb_free_sam(&sampass);
 224                 return nt_status;
 225         }
 226
 227         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 228                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 229                 return nt_status;
 230         }
 231
 232         (*server_info)->user_session_key = user_sess_key;
 233         (*server_info)->lm_session_key = lm_sess_key;
 234
 235         return nt_status;
 236 }
 237
 238 /* module initialisation */
 239 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 240 {
 241         if (!make_auth_methods(auth_context, auth_method)) {
 242                 return NT_STATUS_NO_MEMORY;
 243         }
 244
 245         (*auth_method)->auth = check_sam_security;
 246         (*auth_method)->name = "sam_ignoredomain";
 247         return NT_STATUS_OK;
 248 }
 249
 250
 251 /****************************************************************************
 252 Check SAM security (above) but with a few extra checks.
 253 ****************************************************************************/
 254
 255 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 256                                          void *my_private_data,
 257                                          TALLOC_CTX *mem_ctx,
 258                                          const auth_usersupplied_info *user_info,
 259                                          auth_serversupplied_info **server_info)
 260 {
 261
 262         if (!user_info || !auth_context) {
 263                 return NT_STATUS_LOGON_FAILURE;
 264         }
 265
 266         /* If we are a domain member, we must not
 267            attempt to check the password locally,
 268            unless it is one of our aliases. */
 269
 270         if (!is_myname(user_info->domain.str)) {
 271                 DEBUG(7,("The requested user domain is not the local server name. [%s]\\[%s]\n",
 272                         user_info->domain.str,user_info->internal_username.str));
 273                 return NT_STATUS_NO_SUCH_USER;
 274         }
 275
 276         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 277 }
 278
 279 /* module initialisation */
 280 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 281 {
 282         if (!make_auth_methods(auth_context, auth_method)) {
 283                 return NT_STATUS_NO_MEMORY;
 284         }
 285
 286         (*auth_method)->auth = check_samstrict_security;
 287         (*auth_method)->name = "sam";
 288         return NT_STATUS_OK;
 289 }
 290
 291 NTSTATUS auth_sam_init(void)
 292 {
 293         NTSTATUS ret;
 294         struct auth_operations ops;
 295
 296         ops.name = "sam";
 297         ops.init = auth_init_sam;
 298         ret = register_backend("auth", &ops);
 299         if (!NT_STATUS_IS_OK(ret)) {
 300                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 301                         ops.name));
 302                 return ret;
 303         }
 304
 305         ops.name = "sam_ignoredomain";
 306         ops.init = auth_init_sam_ignoredomain;
 307         ret = register_backend("auth", &ops);
 308         if (!NT_STATUS_IS_OK(ret)) {
 309                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 310                         ops.name));
 311                 return ret;
 312         }
 313
 314         return ret;
 315 }