/* Samba Unix/Linux SMB client library net ads cldap functions Copyright (C) 2001 Andrew Tridgell (tridge@samba.org) Copyright (C) 2003 Jim McDonough (jmcd@us.ibm.com) 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" /* do a cldap netlogon query */ static int send_cldap_netlogon(int sock, const char *domain, const char *hostname, unsigned ntversion) { ASN1_DATA data; char ntver[4]; #ifdef CLDAP_USER_QUERY char aac[4]; SIVAL(aac, 0, 0x00000180); #endif SIVAL(ntver, 0, ntversion); memset(&data, 0, sizeof(data)); asn1_push_tag(&data,ASN1_SEQUENCE(0)); asn1_write_Integer(&data, 4); asn1_push_tag(&data, ASN1_APPLICATION(3)); asn1_write_OctetString(&data, NULL, 0); asn1_write_enumerated(&data, 0); asn1_write_enumerated(&data, 0); asn1_write_Integer(&data, 0); asn1_write_Integer(&data, 0); asn1_write_BOOLEAN2(&data, False); asn1_push_tag(&data, ASN1_CONTEXT(0)); if (domain) { asn1_push_tag(&data, ASN1_CONTEXT(3)); asn1_write_OctetString(&data, "DnsDomain", 9); asn1_write_OctetString(&data, domain, strlen(domain)); asn1_pop_tag(&data); } asn1_push_tag(&data, ASN1_CONTEXT(3)); asn1_write_OctetString(&data, "Host", 4); asn1_write_OctetString(&data, hostname, strlen(hostname)); asn1_pop_tag(&data); #ifdef CLDAP_USER_QUERY asn1_push_tag(&data, ASN1_CONTEXT(3)); asn1_write_OctetString(&data, "User", 4); asn1_write_OctetString(&data, "SAMBA$", 6); asn1_pop_tag(&data); asn1_push_tag(&data, ASN1_CONTEXT(3)); asn1_write_OctetString(&data, "AAC", 4); asn1_write_OctetString(&data, aac, 4); asn1_pop_tag(&data); #endif asn1_push_tag(&data, ASN1_CONTEXT(3)); asn1_write_OctetString(&data, "NtVer", 5); asn1_write_OctetString(&data, ntver, 4); asn1_pop_tag(&data); asn1_pop_tag(&data); asn1_push_tag(&data,ASN1_SEQUENCE(0)); asn1_write_OctetString(&data, "NetLogon", 8); asn1_pop_tag(&data); asn1_pop_tag(&data); asn1_pop_tag(&data); if (data.has_error) { DEBUG(2,("Failed to build cldap netlogon at offset %d\n", (int)data.ofs)); asn1_free(&data); return -1; } if (write(sock, data.data, data.length) != (ssize_t)data.length) { DEBUG(2,("failed to send cldap query (%s)\n", strerror(errno))); asn1_free(&data); return -1; } asn1_free(&data); return 0; } static SIG_ATOMIC_T gotalarm; /*************************************************************** Signal function to tell us we timed out. ****************************************************************/ static void gotalarm_sig(void) { gotalarm = 1; } /* receive a cldap netlogon reply */ static int recv_cldap_netlogon(TALLOC_CTX *mem_ctx, int sock, struct nbt_cldap_netlogon_5 *reply) { int ret; ASN1_DATA data; DATA_BLOB blob = data_blob_null; DATA_BLOB os1 = data_blob_null; DATA_BLOB os2 = data_blob_null; DATA_BLOB os3 = data_blob_null; int i1; /* half the time of a regular ldap timeout, not less than 3 seconds. */ unsigned int al_secs = MAX(3,lp_ldap_timeout()/2); union nbt_cldap_netlogon p; enum ndr_err_code ndr_err; blob = data_blob(NULL, 8192); if (blob.data == NULL) { DEBUG(1, ("data_blob failed\n")); errno = ENOMEM; return -1; } /* Setup timeout */ gotalarm = 0; CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig); alarm(al_secs); /* End setup timeout. */ ret = read(sock, blob.data, blob.length); /* Teardown timeout. */ CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN); alarm(0); if (ret <= 0) { DEBUG(1,("no reply received to cldap netlogon\n")); data_blob_free(&blob); return -1; } blob.length = ret; asn1_load(&data, blob); asn1_start_tag(&data, ASN1_SEQUENCE(0)); asn1_read_Integer(&data, &i1); asn1_start_tag(&data, ASN1_APPLICATION(4)); asn1_read_OctetString(&data, &os1); asn1_start_tag(&data, ASN1_SEQUENCE(0)); asn1_start_tag(&data, ASN1_SEQUENCE(0)); asn1_read_OctetString(&data, &os2); asn1_start_tag(&data, ASN1_SET); asn1_read_OctetString(&data, &os3); asn1_end_tag(&data); asn1_end_tag(&data); asn1_end_tag(&data); asn1_end_tag(&data); asn1_end_tag(&data); if (data.has_error) { data_blob_free(&blob); data_blob_free(&os1); data_blob_free(&os2); data_blob_free(&os3); asn1_free(&data); DEBUG(1,("Failed to parse cldap reply\n")); return -1; } ndr_err = ndr_pull_union_blob_all(&os3, mem_ctx, &p, 5, (ndr_pull_flags_fn_t)ndr_pull_nbt_cldap_netlogon); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { return -1; } *reply = p.logon5; if (DEBUGLEVEL >= 10) { NDR_PRINT_UNION_DEBUG(nbt_cldap_netlogon, 5, &p); } data_blob_free(&os1); data_blob_free(&os2); data_blob_free(&os3); data_blob_free(&blob); asn1_free(&data); return 0; } /******************************************************************* do a cldap netlogon query. Always 389/udp *******************************************************************/ bool ads_cldap_netlogon(TALLOC_CTX *mem_ctx, const char *server, const char *realm, struct nbt_cldap_netlogon_5 *reply) { int sock; int ret; sock = open_udp_socket(server, LDAP_PORT ); if (sock == -1) { DEBUG(2,("ads_cldap_netlogon: Failed to open udp socket to %s\n", server)); return False; } ret = send_cldap_netlogon(sock, realm, global_myname(), 6); if (ret != 0) { close(sock); return False; } ret = recv_cldap_netlogon(mem_ctx, sock, reply); close(sock); if (ret == -1) { return False; } return True; }