| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | Winbind daemon connection manager
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| 5 |
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| 6 | Copyright (C) Tim Potter 2001
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| 7 | Copyright (C) Andrew Bartlett 2002
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| 8 | Copyright (C) Gerald Carter 2003
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify
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| 11 | it under the terms of the GNU General Public License as published by
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| 12 | the Free Software Foundation; either version 2 of the License, or
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| 13 | (at your option) any later version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful,
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | GNU General Public License for more details.
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| 19 |
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| 20 | You should have received a copy of the GNU General Public License
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| 21 | along with this program; if not, write to the Free Software
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| 22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | */
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| 24 |
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| 25 |
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| 26 | #include "includes.h"
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| 27 |
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| 28 | /**********************************************************************
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| 29 | Is this our primary domain ?
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| 30 | **********************************************************************/
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| 31 |
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| 32 | #ifdef HAVE_KRB5
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| 33 | static BOOL is_our_primary_domain(const char *domain)
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| 34 | {
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| 35 | int role = lp_server_role();
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| 36 |
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| 37 | if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
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| 38 | return True;
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| 39 | } else if (strequal(get_global_sam_name(), domain)) {
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| 40 | return True;
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| 41 | }
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| 42 | return False;
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| 43 | }
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| 44 | #endif
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| 45 |
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| 46 | /**************************************************************************
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| 47 | Find the name and IP address for a server in the realm/domain
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| 48 | *************************************************************************/
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| 49 |
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| 50 | static BOOL ads_dc_name(const char *domain,
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| 51 | const char *realm,
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| 52 | struct in_addr *dc_ip,
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| 53 | fstring srv_name)
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| 54 | {
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| 55 | ADS_STRUCT *ads;
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| 56 | char *sitename;
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| 57 | int i;
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| 58 |
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| 59 | if (!realm && strequal(domain, lp_workgroup())) {
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| 60 | realm = lp_realm();
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| 61 | }
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| 62 |
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| 63 | sitename = sitename_fetch(realm);
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| 64 |
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| 65 | /* Try this 3 times then give up. */
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| 66 | for( i =0 ; i < 3; i++) {
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| 67 | ads = ads_init(realm, domain, NULL);
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| 68 | if (!ads) {
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| 69 | SAFE_FREE(sitename);
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| 70 | return False;
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| 71 | }
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| 72 |
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| 73 | DEBUG(4,("ads_dc_name: domain=%s\n", domain));
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| 74 |
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| 75 | #ifdef HAVE_ADS
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| 76 | /* we don't need to bind, just connect */
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| 77 | ads->auth.flags |= ADS_AUTH_NO_BIND;
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| 78 | ads_connect(ads);
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| 79 | #endif
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| 80 |
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| 81 | if (!ads->config.realm) {
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| 82 | SAFE_FREE(sitename);
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| 83 | ads_destroy(&ads);
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| 84 | return False;
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| 85 | }
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| 86 |
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| 87 | /* Now we've found a server, see if our sitename
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| 88 | has changed. If so, we need to re-do the DNS query
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| 89 | to ensure we only find servers in our site. */
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| 90 |
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| 91 | if (stored_sitename_changed(realm, sitename)) {
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| 92 | SAFE_FREE(sitename);
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| 93 | sitename = sitename_fetch(realm);
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| 94 | ads_destroy(&ads);
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| 95 | /* Ensure we don't cache the DC we just connected to. */
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| 96 | namecache_delete(realm, 0x1C);
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| 97 | namecache_delete(domain, 0x1C);
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| 98 | continue;
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| 99 | }
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| 100 |
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| 101 | #ifdef HAVE_KRB5
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| 102 | if (is_our_primary_domain(domain) && (ads->config.flags & ADS_KDC)) {
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| 103 | if (ads_closest_dc(ads)) {
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| 104 | /* We're going to use this KDC for this realm/domain.
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| 105 | If we are using sites, then force the krb5 libs
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| 106 | to use this KDC. */
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| 107 |
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| 108 | create_local_private_krb5_conf_for_domain(realm,
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| 109 | domain,
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| 110 | sitename,
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| 111 | ads->ldap_ip);
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| 112 | } else {
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| 113 | /* use an off site KDC */
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| 114 | create_local_private_krb5_conf_for_domain(realm,
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| 115 | domain,
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| 116 | NULL,
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| 117 | ads->ldap_ip);
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| 118 | }
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| 119 | }
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| 120 | #endif
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| 121 | break;
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| 122 | }
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| 123 |
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| 124 | if (i == 3) {
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| 125 | DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
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| 126 | sitename ? sitename : ""));
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| 127 | SAFE_FREE(sitename);
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| 128 | return False;
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| 129 | }
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| 130 |
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| 131 | SAFE_FREE(sitename);
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| 132 |
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| 133 | fstrcpy(srv_name, ads->config.ldap_server_name);
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| 134 | strupper_m(srv_name);
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| 135 | *dc_ip = ads->ldap_ip;
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| 136 | ads_destroy(&ads);
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| 137 |
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| 138 | DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
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| 139 | srv_name, inet_ntoa(*dc_ip)));
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| 140 |
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| 141 | return True;
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| 142 | }
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| 143 |
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| 144 | /****************************************************************************
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| 145 | Utility function to return the name of a DC. The name is guaranteed to be
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| 146 | valid since we have already done a name_status_find on it
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| 147 | ***************************************************************************/
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| 148 |
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| 149 | static BOOL rpc_dc_name(const char *domain, fstring srv_name, struct in_addr *ip_out)
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| 150 | {
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| 151 | struct ip_service *ip_list = NULL;
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| 152 | struct in_addr dc_ip, exclude_ip;
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| 153 | int count, i;
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| 154 | NTSTATUS result;
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| 155 |
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| 156 | zero_ip(&exclude_ip);
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| 157 |
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| 158 | /* get a list of all domain controllers */
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| 159 |
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| 160 | if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, NULL, &ip_list, &count,
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| 161 | False))) {
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| 162 | DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
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| 163 | return False;
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| 164 | }
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| 165 |
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| 166 | /* Remove the entry we've already failed with (should be the PDC). */
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| 167 |
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| 168 | for (i = 0; i < count; i++) {
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| 169 | if (is_zero_ip(ip_list[i].ip))
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| 170 | continue;
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| 171 |
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| 172 | if (name_status_find(domain, 0x1c, 0x20, ip_list[i].ip, srv_name)) {
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| 173 | result = check_negative_conn_cache( domain, srv_name );
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| 174 | if ( NT_STATUS_IS_OK(result) ) {
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| 175 | dc_ip = ip_list[i].ip;
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| 176 | goto done;
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| 177 | }
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| 178 | }
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| 179 | }
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| 180 |
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| 181 |
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| 182 | SAFE_FREE(ip_list);
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| 183 |
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| 184 | /* No-one to talk to )-: */
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| 185 | return False; /* Boo-hoo */
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| 186 |
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| 187 | done:
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| 188 | /* We have the netbios name and IP address of a domain controller.
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| 189 | Ideally we should sent a SAMLOGON request to determine whether
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| 190 | the DC is alive and kicking. If we can catch a dead DC before
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| 191 | performing a cli_connect() we can avoid a 30-second timeout. */
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| 192 |
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| 193 | DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
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| 194 | inet_ntoa(dc_ip), domain));
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| 195 |
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| 196 | *ip_out = dc_ip;
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| 197 |
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| 198 | SAFE_FREE(ip_list);
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| 199 |
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| 200 | return True;
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| 201 | }
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| 202 |
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| 203 | /**********************************************************************
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| 204 | wrapper around ads and rpc methods of finds DC's
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| 205 | **********************************************************************/
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| 206 |
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| 207 | BOOL get_dc_name(const char *domain, const char *realm, fstring srv_name, struct in_addr *ip_out)
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| 208 | {
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| 209 | struct in_addr dc_ip;
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| 210 | BOOL ret;
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| 211 | BOOL our_domain = False;
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| 212 |
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| 213 | zero_ip(&dc_ip);
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| 214 |
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| 215 | ret = False;
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| 216 |
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| 217 | if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
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| 218 | our_domain = True;
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| 219 |
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| 220 | /* always try to obey what the admin specified in smb.conf
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| 221 | (for the local domain) */
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| 222 |
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| 223 | if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
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| 224 | ret = ads_dc_name(domain, realm, &dc_ip, srv_name);
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| 225 | }
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| 226 |
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| 227 | if (!domain) {
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| 228 | /* if we have only the realm we can't do anything else */
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| 229 | return False;
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| 230 | }
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| 231 |
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| 232 | if (!ret) {
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| 233 | /* fall back on rpc methods if the ADS methods fail */
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| 234 | ret = rpc_dc_name(domain, srv_name, &dc_ip);
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| 235 | }
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| 236 |
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| 237 | *ip_out = dc_ip;
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| 238 |
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| 239 | return ret;
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| 240 | }
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