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winbindd_util.c

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/* 
   Unix SMB/CIFS implementation.

   Winbind daemon for ntdom nss module

   Copyright (C) Tim Potter 2000-2001
   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "winbindd.h"
#include "sids.h"

/**
 * @file winbindd_util.c
 *
 * Winbind daemon for NT domain authentication nss module.
 **/


/**
 * Used to clobber name fields that have an undefined value.
 *
 * Correct code should never look at a field that has this value.
 **/

00040 static const fstring name_deadbeef = "<deadbeef>";

/* The list of trusted domains.  Note that the list can be deleted and
   recreated using the init_domain_list() function so pointers to
   individual winbindd_domain structures cannot be made.  Keep a copy of
   the domain name instead. */

static struct winbindd_domain *_domain_list;

struct winbindd_domain *domain_list(void)
{
      /* Initialise list */

      if (!_domain_list)
            init_domain_list();

      return _domain_list;
}

/* Free all entries in the trusted domain list */

void free_domain_list(void)
{
      struct winbindd_domain *domain = _domain_list;

      while(domain) {
            struct winbindd_domain *next = domain->next;
            
            DLIST_REMOVE(_domain_list, domain);
            SAFE_FREE(domain);
            domain = next;
      }
}

/* Add a trusted domain to our list of domains */

static struct winbindd_domain *add_trusted_domain(char *domain_name,
                                      struct winbindd_methods *methods)
{
      struct winbindd_domain *domain;
        
      /* We can't call domain_list() as this function is called from
         init_domain_list() and we'll get stuck in a loop. */

      for (domain = _domain_list; domain; domain = domain->next) {
            if (strcmp(domain_name, domain->name) == 0) {
                  DEBUG(3, ("domain %s already in domain list\n", 
                          domain_name));
                  return domain;
            }
      }
        
      /* Create new domain entry */

      if ((domain = (struct winbindd_domain *)
           malloc(sizeof(*domain))) == NULL)
            return NULL;

      /* Fill in fields */
        
      ZERO_STRUCTP(domain);

      fstrcpy(domain->name, domain_name);
        domain->methods = methods;
      domain->sequence_number = DOM_SEQUENCE_NONE;
      domain->last_seq_check = 0;

      /* Link to domain list */
        
      DLIST_ADD(_domain_list, domain);
        
      return domain;
}

/* Look up global info for the winbind daemon */

BOOL init_domain_list(void)
{
      NTSTATUS result;
      TALLOC_CTX *mem_ctx;
      extern struct winbindd_methods cache_methods;
      struct winbindd_domain *domain;
      DOM_SID *dom_sids;
      char **names;
      uint32 num_domains = 0;

      if (!(mem_ctx = talloc_init_named("init_domain_list")))
            return False;

      /* Free existing list */

      free_domain_list();

      /* Add ourselves as the first entry */

      domain = add_trusted_domain(lp_workgroup(), &cache_methods);

      /* Now we *must* get the domain sid for our primary domain. Go into
         a holding pattern until that is available */

      result = cache_methods.domain_sid(domain, &domain->sid);
      while (!NT_STATUS_IS_OK(result)) {
            /* Free up temporary memory */
            lp_talloc_free();

            sleep(10);
            DEBUG(1,("Retrying startup domain sid fetch for %s\n",
                   domain->name));
            result = cache_methods.domain_sid(domain, &domain->sid);
      }
       
      DEBUG(1,("Added domain %s (%s)\n", 
             domain->name, 
             sid_string_static(&domain->sid)));

      DEBUG(1, ("getting trusted domain list\n"));

      result = cache_methods.trusted_domains(domain, mem_ctx, &num_domains,
                                     &names, &dom_sids);

      /* Add each domain to the trusted domain list */
      if (NT_STATUS_IS_OK(result)) {
            int i;
            for(i = 0; i < num_domains; i++) {
                  domain = add_trusted_domain(names[i], &cache_methods);
                  if (!domain) continue;
                  sid_copy(&domain->sid, &dom_sids[i]);
                  DEBUG(1,("Added domain %s (%s)\n", 
                         domain->name, 
                         sid_string_static(&domain->sid)));
            }
      }

      talloc_destroy(mem_ctx);
      return True;
}

/* Given a domain name, return the struct winbindd domain info for it 
   if it is actually working. */

struct winbindd_domain *find_domain_from_name(const char *domain_name)
{
      struct winbindd_domain *domain;

      /* Search through list */

      for (domain = domain_list(); domain != NULL; domain = domain->next) {
            if (strequal(domain_name, domain->name) ||
                strequal(domain_name, domain->full_name))
                  return domain;
      }

      /* Not found */

      return NULL;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid(DOM_SID *sid)
{
      struct winbindd_domain *domain;

      /* Search through list */

      for (domain = domain_list(); domain != NULL; domain = domain->next) {
            if (sid_compare_domain(sid, &domain->sid) == 0)
                  return domain;
      }

      /* Not found */

      return NULL;
}

/* Lookup a sid in a domain from a name */

BOOL winbindd_lookup_sid_by_name(struct winbindd_domain *domain, 
                         const char *name, DOM_SID *sid, 
                         enum SID_NAME_USE *type)
{
      NTSTATUS result;
        
      /* Don't bother with machine accounts */
        
      if (name[strlen(name) - 1] == '$')
            return False;

      /* Lookup name */
      result = domain->methods->name_to_sid(domain, name, sid, type);
        
      /* Return rid and type if lookup successful */
      if (!NT_STATUS_IS_OK(result)) {
            *type = SID_NAME_UNKNOWN;
      }

      return NT_STATUS_IS_OK(result);
}

/**
 * @brief Lookup a name in a domain from a sid.
 *
 * @param sid Security ID you want to look up.
 *
 * @param name On success, set to the name corresponding to @p sid.
 * 
 * @param dom_name On success, set to the 'domain name' corresponding to @p sid.
 * 
 * @param type On success, contains the type of name: alias, group or
 * user.
 *
 * @retval True if the name exists, in which case @p name and @p type
 * are set, otherwise False.
 **/
00254 BOOL winbindd_lookup_name_by_sid(DOM_SID *sid,
                         fstring dom_name,
                         fstring name,
                         enum SID_NAME_USE *type)
{
      char *names;
      NTSTATUS result;
      TALLOC_CTX *mem_ctx;
      BOOL rv = False;
      struct winbindd_domain *domain;

      domain = find_domain_from_sid(sid);

      if (!domain) {
            DEBUG(1,("Can't find domain from sid\n"));
            return False;
      }

      /* Lookup name */

      if (!(mem_ctx = talloc_init_named("winbindd_lookup_name_by_sid")))
            return False;
        
      result = domain->methods->sid_to_name(domain, mem_ctx, sid, &names, type);

      /* Return name and type if successful */
        
      if ((rv = NT_STATUS_IS_OK(result))) {
            fstrcpy(dom_name, domain->name);
            fstrcpy(name, names);
      } else {
            *type = SID_NAME_UNKNOWN;
            fstrcpy(name, name_deadbeef);
      }
        
      talloc_destroy(mem_ctx);

      return rv;
}


/* Free state information held for {set,get,end}{pw,gr}ent() functions */

void free_getent_state(struct getent_state *state)
{
      struct getent_state *temp;

      /* Iterate over state list */

      temp = state;

      while(temp != NULL) {
            struct getent_state *next;

            /* Free sam entries then list entry */

            SAFE_FREE(state->sam_entries);
            DLIST_REMOVE(state, state);
            next = temp->next;

            SAFE_FREE(temp);
            temp = next;
      }
}

/* Initialise trusted domain info */

BOOL winbindd_param_init(void)
{
      /* Parse winbind uid and winbind_gid parameters */

      if (!lp_winbind_uid(&server_state.uid_low, &server_state.uid_high)) {
            DEBUG(0, ("winbind uid range missing or invalid\n"));
            return False;
      }
      
      if (!lp_winbind_gid(&server_state.gid_low, &server_state.gid_high)) {
            DEBUG(0, ("winbind gid range missing or invalid\n"));
            return False;
      }
      
      return True;
}

/* Check if a domain is present in a comma-separated list of domains */

BOOL check_domain_env(char *domain_env, char *domain)
{
      fstring name;
      const char *tmp = domain_env;

      while(next_token(&tmp, name, ",", sizeof(fstring))) {
            if (strequal(name, domain))
                  return True;
      }

      return False;
}

/* Parse a string of the form DOMAIN/user into a domain and a user */
extern fstring global_myworkgroup;

BOOL parse_domain_user(const char *domuser, fstring domain, fstring user)
{
      char *p = strchr(domuser,*lp_winbind_separator());

      if (!(p || lp_winbind_use_default_domain()))
            return False;
      
      if(!p && lp_winbind_use_default_domain()) {
            fstrcpy(user, domuser);
            fstrcpy(domain, global_myworkgroup);
      } else {
            fstrcpy(user, p+1);
            fstrcpy(domain, domuser);
            domain[PTR_DIFF(p, domuser)] = 0;
      }
      strupper(domain);
      return True;
}

/*
    Fill DOMAIN\\USERNAME entry accounting 'winbind use default domain' and
    'winbind separator' options.
    This means:
      - omit DOMAIN when 'winbind use default domain = true' and DOMAIN is
      global_myworkgroup
       
*/
void fill_domain_username(fstring name, const char *domain, const char *user)
{
      if(lp_winbind_use_default_domain() &&
          !strcmp(global_myworkgroup, domain)) {
            strlcpy(name, user, sizeof(fstring));
      } else {
            slprintf(name, sizeof(fstring) - 1, "%s%s%s",
                   domain, lp_winbind_separator(),
                   user);
      }
}

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