| 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 3 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, see <http://www.gnu.org/licenses/>.
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| 22 | */
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| 23 |
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| 24 |
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| 25 | #include "includes.h"
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| 26 | #include "libads/sitename_cache.h"
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| 27 | #include "ads.h"
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| 28 | #include "../librpc/gen_ndr/nbt.h"
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| 29 | #include "lib/param/loadparm.h"
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| 30 |
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| 31 | /**********************************************************************
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| 32 | Is this our primary domain ?
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| 33 | **********************************************************************/
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| 34 |
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| 35 | #ifdef HAVE_KRB5
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| 36 | static bool is_our_primary_domain(const char *domain)
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| 37 | {
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| 38 | int role = lp_server_role();
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| 39 |
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| 40 | if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
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| 41 | return True;
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| 42 | } else if (strequal(get_global_sam_name(), domain)) {
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| 43 | return True;
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| 44 | }
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| 45 | return False;
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| 46 | }
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| 47 | #endif
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| 48 |
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| 49 | /**************************************************************************
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| 50 | Find the name and IP address for a server in the realm/domain
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| 51 | *************************************************************************/
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| 52 |
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| 53 | static bool ads_dc_name(const char *domain,
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| 54 | const char *realm,
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| 55 | struct sockaddr_storage *dc_ss,
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| 56 | fstring srv_name)
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| 57 | {
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| 58 | ADS_STRUCT *ads;
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| 59 | char *sitename;
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| 60 | int i;
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| 61 | char addr[INET6_ADDRSTRLEN];
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| 62 |
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| 63 | if (!realm && strequal(domain, lp_workgroup())) {
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| 64 | realm = lp_realm();
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| 65 | }
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| 66 |
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| 67 | sitename = sitename_fetch(talloc_tos(), realm);
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| 68 |
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| 69 | /* Try this 3 times then give up. */
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| 70 | for( i =0 ; i < 3; i++) {
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| 71 | ads = ads_init(realm, domain, NULL);
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| 72 | if (!ads) {
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| 73 | TALLOC_FREE(sitename);
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| 74 | return False;
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| 75 | }
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| 76 |
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| 77 | DEBUG(4,("ads_dc_name: domain=%s\n", domain));
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| 78 |
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| 79 | #ifdef HAVE_ADS
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| 80 | /* we don't need to bind, just connect */
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| 81 | ads->auth.flags |= ADS_AUTH_NO_BIND;
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| 82 | ads_connect(ads);
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| 83 | #endif
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| 84 |
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| 85 | if (!ads->config.realm) {
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| 86 | TALLOC_FREE(sitename);
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| 87 | ads_destroy(&ads);
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| 88 | return False;
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| 89 | }
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| 90 |
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| 91 | /* Now we've found a server, see if our sitename
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| 92 | has changed. If so, we need to re-do the DNS query
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| 93 | to ensure we only find servers in our site. */
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| 94 |
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| 95 | if (stored_sitename_changed(realm, sitename)) {
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| 96 | TALLOC_FREE(sitename);
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| 97 | sitename = sitename_fetch(talloc_tos(), realm);
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| 98 | ads_destroy(&ads);
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| 99 | /* Ensure we don't cache the DC we just connected to. */
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| 100 | namecache_delete(realm, 0x1C);
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| 101 | namecache_delete(domain, 0x1C);
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| 102 | continue;
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| 103 | }
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| 104 |
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| 105 | #ifdef HAVE_ADS
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| 106 | if (is_our_primary_domain(domain) && (ads->config.flags & NBT_SERVER_KDC)) {
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| 107 | if (ads_closest_dc(ads)) {
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| 108 | /* We're going to use this KDC for this realm/domain.
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| 109 | If we are using sites, then force the krb5 libs
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| 110 | to use this KDC. */
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| 111 |
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| 112 | create_local_private_krb5_conf_for_domain(realm,
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| 113 | domain,
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| 114 | sitename,
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| 115 | &ads->ldap.ss);
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| 116 | } else {
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| 117 | create_local_private_krb5_conf_for_domain(realm,
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| 118 | domain,
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| 119 | NULL,
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| 120 | &ads->ldap.ss);
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| 121 | }
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| 122 | }
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| 123 | #endif
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| 124 | break;
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| 125 | }
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| 126 |
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| 127 | if (i == 3) {
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| 128 | DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
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| 129 | sitename ? sitename : ""));
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| 130 | TALLOC_FREE(sitename);
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| 131 | ads_destroy(&ads);
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| 132 | return False;
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| 133 | }
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| 134 |
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| 135 | TALLOC_FREE(sitename);
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| 136 |
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| 137 | fstrcpy(srv_name, ads->config.ldap_server_name);
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| 138 | if (!strupper_m(srv_name)) {
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| 139 | ads_destroy(&ads);
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| 140 | return false;
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| 141 | }
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| 142 | #ifdef HAVE_ADS
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| 143 | *dc_ss = ads->ldap.ss;
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| 144 | #else
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| 145 | zero_sockaddr(dc_ss);
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| 146 | #endif
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| 147 | ads_destroy(&ads);
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| 148 |
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| 149 | print_sockaddr(addr, sizeof(addr), dc_ss);
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| 150 | DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
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| 151 | srv_name, addr));
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| 152 |
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| 153 | return True;
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| 154 | }
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| 155 |
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| 156 | /****************************************************************************
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| 157 | Utility function to return the name of a DC. The name is guaranteed to be
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| 158 | valid since we have already done a name_status_find on it
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| 159 | ***************************************************************************/
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| 160 |
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| 161 | static bool rpc_dc_name(const char *domain,
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| 162 | fstring srv_name,
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| 163 | struct sockaddr_storage *ss_out)
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| 164 | {
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| 165 | struct ip_service *ip_list = NULL;
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| 166 | struct sockaddr_storage dc_ss;
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| 167 | int count, i;
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| 168 | NTSTATUS result;
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| 169 | char addr[INET6_ADDRSTRLEN];
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| 170 |
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| 171 | /* get a list of all domain controllers */
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| 172 |
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| 173 | if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, NULL, &ip_list, &count,
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| 174 | False))) {
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| 175 | DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
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| 176 | return False;
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| 177 | }
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| 178 |
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| 179 | /* Remove the entry we've already failed with (should be the PDC). */
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| 180 |
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| 181 | for (i = 0; i < count; i++) {
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| 182 | if (is_zero_addr(&ip_list[i].ss))
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| 183 | continue;
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| 184 |
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| 185 | if (name_status_find(domain, 0x1c, 0x20, &ip_list[i].ss, srv_name)) {
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| 186 | result = check_negative_conn_cache( domain, srv_name );
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| 187 | if ( NT_STATUS_IS_OK(result) ) {
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| 188 | dc_ss = ip_list[i].ss;
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| 189 | goto done;
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| 190 | }
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| 191 | }
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| 192 | }
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| 193 |
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| 194 | SAFE_FREE(ip_list);
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| 195 |
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| 196 | /* No-one to talk to )-: */
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| 197 | return False; /* Boo-hoo */
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| 198 |
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| 199 | done:
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| 200 | /* We have the netbios name and IP address of a domain controller.
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| 201 | Ideally we should sent a SAMLOGON request to determine whether
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| 202 | the DC is alive and kicking. If we can catch a dead DC before
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| 203 | performing a cli_connect() we can avoid a 30-second timeout. */
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| 204 |
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| 205 | print_sockaddr(addr, sizeof(addr), &dc_ss);
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| 206 | DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
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| 207 | addr, domain));
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| 208 |
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| 209 | *ss_out = dc_ss;
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| 210 | SAFE_FREE(ip_list);
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| 211 |
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| 212 | return True;
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| 213 | }
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| 214 |
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| 215 | /**********************************************************************
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| 216 | wrapper around ads and rpc methods of finds DC's
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| 217 | **********************************************************************/
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| 218 |
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| 219 | bool get_dc_name(const char *domain,
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| 220 | const char *realm,
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| 221 | fstring srv_name,
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| 222 | struct sockaddr_storage *ss_out)
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| 223 | {
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| 224 | struct sockaddr_storage dc_ss;
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| 225 | bool ret;
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| 226 | bool our_domain = False;
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| 227 |
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| 228 | zero_sockaddr(&dc_ss);
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| 229 |
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| 230 | ret = False;
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| 231 |
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| 232 | if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
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| 233 | our_domain = True;
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| 234 |
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| 235 | /* always try to obey what the admin specified in smb.conf
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| 236 | (for the local domain) */
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| 237 |
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| 238 | if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
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| 239 | ret = ads_dc_name(domain, realm, &dc_ss, srv_name);
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| 240 | }
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| 241 |
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| 242 | if (!domain) {
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| 243 | /* if we have only the realm we can't do anything else */
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| 244 | return False;
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| 245 | }
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| 246 |
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| 247 | if (!ret) {
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| 248 | /* fall back on rpc methods if the ADS methods fail */
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| 249 | ret = rpc_dc_name(domain, srv_name, &dc_ss);
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| 250 | }
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| 251 |
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| 252 | *ss_out = dc_ss;
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| 253 |
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| 254 | return ret;
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| 255 | }
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