source3/rpc_server/srv_lsa_hnd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-1997,
   5  *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
   6  *  Copyright (C) Jeremy Allison                           2001.
   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
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_RPC_SRV
  26
  27 /* This is the max handles across all instances of a pipe name. */
  28 #ifndef MAX_OPEN_POLS
  29 #define MAX_OPEN_POLS 1024
  30 #endif
  31
  32 /****************************************************************************
  33  Hack as handles need to be persisant over lsa pipe closes so long as a samr
  34  pipe is open. JRA.
  35 ****************************************************************************/
  36
  37 static bool is_samr_lsa_pipe(const char *pipe_name)
  38 {
  39         return (strstr(pipe_name, "samr") || strstr(pipe_name, "lsa"));
  40 }
  41
  42 /****************************************************************************
  43  Initialise a policy handle list on a pipe. Handle list is shared between all
  44  pipes of the same name.
  45 ****************************************************************************/
  46
  47 bool init_pipe_handle_list(pipes_struct *p, const char *pipe_name)
  48 {
  49         pipes_struct *plist = get_first_internal_pipe();
  50         struct handle_list *hl = NULL;
  51
  52         for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist)) {
  53                 if (strequal( plist->name, pipe_name) ||
  54                                 (is_samr_lsa_pipe(plist->name) && is_samr_lsa_pipe(pipe_name))) {
  55                         if (!plist->pipe_handles) {
  56                                 char *msg;
  57                                 asprintf(&msg, "init_pipe_handles: NULL "
  58                                          "pipe_handle pointer in pipe %s",
  59                                          pipe_name);
  60                                 smb_panic(msg);
  61                         }
  62                         hl = plist->pipe_handles;
  63                         break;
  64                 }
  65         }
  66
  67         if (!hl) {
  68                 /*
  69                  * No handle list for this pipe (first open of pipe).
  70                  * Create list.
  71                  */
  72
  73                 if ((hl = SMB_MALLOC_P(struct handle_list)) == NULL)
  74                         return False;
  75                 ZERO_STRUCTP(hl);
  76
  77                 DEBUG(10,("init_pipe_handles: created handle list for pipe %s\n", pipe_name ));
  78         }
  79
  80         /*
  81          * One more pipe is using this list.
  82          */
  83
  84         hl->pipe_ref_count++;
  85
  86         /*
  87          * Point this pipe at this list.
  88          */
  89
  90         p->pipe_handles = hl;
  91
  92         DEBUG(10,("init_pipe_handles: pipe_handles ref count = %lu for pipe %s\n",
  93                   (unsigned long)p->pipe_handles->pipe_ref_count, pipe_name ));
  94
  95         return True;
  96 }
  97
  98 /****************************************************************************
  99   find first available policy slot.  creates a policy handle for you.
 100 ****************************************************************************/
 101
 102 bool create_policy_hnd(pipes_struct *p, POLICY_HND *hnd, void (*free_fn)(void *), void *data_ptr)
 103 {
 104         static uint32 pol_hnd_low  = 0;
 105         static uint32 pol_hnd_high = 0;
 106         time_t t = time(NULL);
 107
 108         struct policy *pol;
 109
 110         if (p->pipe_handles->count > MAX_OPEN_POLS) {
 111                 DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
 112                                 (int)p->pipe_handles->count));
 113                 return False;
 114         }
 115
 116         pol = SMB_MALLOC_P(struct policy);
 117         if (!pol) {
 118                 DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
 119                 return False;
 120         }
 121
 122         ZERO_STRUCTP(pol);
 123
 124         pol->data_ptr = data_ptr;
 125         pol->free_fn = free_fn;
 126
 127         pol_hnd_low++;
 128         if (pol_hnd_low == 0)
 129                 (pol_hnd_high)++;
 130
 131         SIVAL(&pol->pol_hnd.handle_type, 0 , 0);  /* first bit must be null */
 132         SIVAL(&pol->pol_hnd.uuid.time_low, 0 , pol_hnd_low ); /* second bit is incrementing */
 133         SSVAL(&pol->pol_hnd.uuid.time_mid, 0 , pol_hnd_high); /* second bit is incrementing */
 134         SSVAL(&pol->pol_hnd.uuid.time_hi_and_version, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
 135
 136         /* split the current time into two 16 bit values */
 137
 138         SSVAL(pol->pol_hnd.uuid.clock_seq, 0, (t>>16)); /* something random */
 139         SSVAL(pol->pol_hnd.uuid.node, 0, t); /* something random */
 140
 141         SIVAL(pol->pol_hnd.uuid.node, 2, sys_getpid()); /* something more random */
 142
 143         DLIST_ADD(p->pipe_handles->Policy, pol);
 144         p->pipe_handles->count++;
 145
 146         *hnd = pol->pol_hnd;
 147
 148         DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
 149         dump_data(4, (uint8 *)hnd, sizeof(*hnd));
 150
 151         return True;
 152 }
 153
 154 /****************************************************************************
 155   find policy by handle - internal version.
 156 ****************************************************************************/
 157
 158 static struct policy *find_policy_by_hnd_internal(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 159 {
 160         struct policy *pol;
 161         size_t i;
 162
 163         if (data_p)
 164                 *data_p = NULL;
 165
 166         for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
 167                 if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
 168                         DEBUG(4,("Found policy hnd[%d] ", (int)i));
 169                         dump_data(4, (uint8 *)hnd, sizeof(*hnd));
 170                         if (data_p)
 171                                 *data_p = pol->data_ptr;
 172                         return pol;
 173                 }
 174         }
 175
 176         DEBUG(4,("Policy not found: "));
 177         dump_data(4, (uint8 *)hnd, sizeof(*hnd));
 178
 179         p->bad_handle_fault_state = True;
 180
 181         return NULL;
 182 }
 183
 184 /****************************************************************************
 185   find policy by handle
 186 ****************************************************************************/
 187
 188 bool find_policy_by_hnd(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 189 {
 190         return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
 191 }
 192
 193 /****************************************************************************
 194   Close a policy.
 195 ****************************************************************************/
 196
 197 bool close_policy_hnd(pipes_struct *p, POLICY_HND *hnd)
 198 {
 199         struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
 200
 201         if (!pol) {
 202                 DEBUG(3,("Error closing policy\n"));
 203                 return False;
 204         }
 205
 206         DEBUG(3,("Closed policy\n"));
 207
 208         if (pol->free_fn && pol->data_ptr)
 209                 (*pol->free_fn)(pol->data_ptr);
 210
 211         p->pipe_handles->count--;
 212
 213         DLIST_REMOVE(p->pipe_handles->Policy, pol);
 214
 215         ZERO_STRUCTP(pol);
 216
 217         SAFE_FREE(pol);
 218
 219         return True;
 220 }
 221
 222 /****************************************************************************
 223  Close a pipe - free the handle list if it was the last pipe reference.
 224 ****************************************************************************/
 225
 226 void close_policy_by_pipe(pipes_struct *p)
 227 {
 228         p->pipe_handles->pipe_ref_count--;
 229
 230         if (p->pipe_handles->pipe_ref_count == 0) {
 231                 /*
 232                  * Last pipe open on this list - free the list.
 233                  */
 234                 while (p->pipe_handles->Policy)
 235                         close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
 236
 237                 p->pipe_handles->Policy = NULL;
 238                 p->pipe_handles->count = 0;
 239
 240                 SAFE_FREE(p->pipe_handles);
 241                 DEBUG(10,("close_policy_by_pipe: deleted handle list for pipe %s\n", p->name ));
 242         }
 243 }
 244
 245 /*******************************************************************
 246 Shall we allow access to this rpc?  Currently this function
 247 implements the 'restrict anonymous' setting by denying access to
 248 anonymous users if the restrict anonymous level is > 0.  Further work
 249 will be checking a security descriptor to determine whether a user
 250 token has enough access to access the pipe.
 251 ********************************************************************/
 252
 253 bool pipe_access_check(pipes_struct *p)
 254 {
 255         /* Don't let anonymous users access this RPC if restrict
 256            anonymous > 0 */
 257
 258         if (lp_restrict_anonymous() > 0) {
 259
 260                 /* schannel, so we must be ok */
 261                 if (p->pipe_bound && (p->auth.auth_type == PIPE_AUTH_TYPE_SCHANNEL)) {
 262                         return True;
 263                 }
 264
 265                 if (p->server_info->guest) {
 266                         return False;
 267                 }
 268         }
 269
 270         return True;
 271 }