mirror of
https://github.com/samba-team/samba.git
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171a5cd5c0
Guenther
(This used to be commit af3779a516
)
314 lines
8.3 KiB
C
314 lines
8.3 KiB
C
/*
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Samba Unix/Linux SMB client library
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net ads cldap functions
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Copyright (C) 2001 Andrew Tridgell (tridge@samba.org)
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Copyright (C) 2003 Jim McDonough (jmcd@us.ibm.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/*
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These seem to be strings as described in RFC1035 4.1.4 and can be:
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- a sequence of labels ending in a zero octet
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- a pointer
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- a sequence of labels ending with a pointer
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A label is a byte where the first two bits must be zero and the remaining
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bits represent the length of the label followed by the label itself.
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Therefore, the length of a label is at max 64 bytes. Under RFC1035, a
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sequence of labels cannot exceed 255 bytes.
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A pointer consists of a 14 bit offset from the beginning of the data.
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struct ptr {
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unsigned ident:2; // must be 11
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unsigned offset:14; // from the beginning of data
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};
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This is used as a method to compress the packet by eliminated duplicate
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domain components. Since a UDP packet should probably be < 512 bytes and a
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DNS name can be up to 255 bytes, this actually makes a lot of sense.
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*/
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static unsigned pull_netlogon_string(char *ret, const char *ptr,
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const char *data)
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{
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char *pret = ret;
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int followed_ptr = 0;
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unsigned ret_len = 0;
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memset(pret, 0, MAX_DNS_LABEL);
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do {
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if ((*ptr & 0xc0) == 0xc0) {
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uint16 len;
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if (!followed_ptr) {
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ret_len += 2;
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followed_ptr = 1;
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}
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len = ((ptr[0] & 0x3f) << 8) | ptr[1];
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ptr = data + len;
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} else if (*ptr) {
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uint8 len = (uint8)*(ptr++);
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if ((pret - ret + len + 1) >= MAX_DNS_LABEL) {
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DEBUG(1,("DC returning too long DNS name\n"));
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return 0;
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}
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if (pret != ret) {
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*pret = '.';
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pret++;
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}
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memcpy(pret, ptr, len);
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pret += len;
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ptr += len;
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if (!followed_ptr) {
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ret_len += (len + 1);
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}
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}
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} while (*ptr);
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return followed_ptr ? ret_len : ret_len + 1;
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}
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/*
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do a cldap netlogon query
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*/
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static int send_cldap_netlogon(int sock, const char *domain,
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const char *hostname, unsigned ntversion)
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{
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ASN1_DATA data;
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char ntver[4];
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#ifdef CLDAP_USER_QUERY
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char aac[4];
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SIVAL(aac, 0, 0x00000180);
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#endif
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SIVAL(ntver, 0, ntversion);
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memset(&data, 0, sizeof(data));
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asn1_push_tag(&data,ASN1_SEQUENCE(0));
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asn1_write_Integer(&data, 4);
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asn1_push_tag(&data, ASN1_APPLICATION(3));
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asn1_write_OctetString(&data, NULL, 0);
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asn1_write_enumerated(&data, 0);
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asn1_write_enumerated(&data, 0);
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asn1_write_Integer(&data, 0);
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asn1_write_Integer(&data, 0);
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asn1_write_BOOLEAN2(&data, False);
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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if (domain) {
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asn1_push_tag(&data, ASN1_CONTEXT(3));
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asn1_write_OctetString(&data, "DnsDomain", 9);
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asn1_write_OctetString(&data, domain, strlen(domain));
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asn1_pop_tag(&data);
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}
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asn1_push_tag(&data, ASN1_CONTEXT(3));
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asn1_write_OctetString(&data, "Host", 4);
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asn1_write_OctetString(&data, hostname, strlen(hostname));
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asn1_pop_tag(&data);
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#ifdef CLDAP_USER_QUERY
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asn1_push_tag(&data, ASN1_CONTEXT(3));
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asn1_write_OctetString(&data, "User", 4);
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asn1_write_OctetString(&data, "SAMBA$", 6);
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asn1_pop_tag(&data);
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asn1_push_tag(&data, ASN1_CONTEXT(3));
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asn1_write_OctetString(&data, "AAC", 4);
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asn1_write_OctetString(&data, aac, 4);
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asn1_pop_tag(&data);
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#endif
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asn1_push_tag(&data, ASN1_CONTEXT(3));
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asn1_write_OctetString(&data, "NtVer", 5);
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asn1_write_OctetString(&data, ntver, 4);
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asn1_pop_tag(&data);
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asn1_pop_tag(&data);
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asn1_push_tag(&data,ASN1_SEQUENCE(0));
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asn1_write_OctetString(&data, "NetLogon", 8);
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asn1_pop_tag(&data);
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asn1_pop_tag(&data);
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asn1_pop_tag(&data);
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if (data.has_error) {
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DEBUG(2,("Failed to build cldap netlogon at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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return -1;
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}
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if (write(sock, data.data, data.length) != (ssize_t)data.length) {
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DEBUG(2,("failed to send cldap query (%s)\n", strerror(errno)));
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asn1_free(&data);
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return -1;
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}
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asn1_free(&data);
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return 0;
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}
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static SIG_ATOMIC_T gotalarm;
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/***************************************************************
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Signal function to tell us we timed out.
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****************************************************************/
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static void gotalarm_sig(void)
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{
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gotalarm = 1;
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}
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/*
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receive a cldap netlogon reply
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*/
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static int recv_cldap_netlogon(int sock, struct cldap_netlogon_reply *reply)
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{
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int ret;
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ASN1_DATA data;
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DATA_BLOB blob;
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DATA_BLOB os1, os2, os3;
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int i1;
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/* half the time of a regular ldap timeout, not less than 3 seconds. */
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unsigned int al_secs = MAX(3,lp_ldap_timeout()/2);
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char *p;
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blob = data_blob(NULL, 8192);
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if (blob.data == NULL) {
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DEBUG(1, ("data_blob failed\n"));
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errno = ENOMEM;
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return -1;
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}
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/* Setup timeout */
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gotalarm = 0;
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CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
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alarm(al_secs);
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/* End setup timeout. */
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ret = read(sock, blob.data, blob.length);
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/* Teardown timeout. */
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CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
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alarm(0);
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if (ret <= 0) {
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DEBUG(1,("no reply received to cldap netlogon\n"));
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data_blob_free(&blob);
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return -1;
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}
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blob.length = ret;
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asn1_load(&data, blob);
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_read_Integer(&data, &i1);
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asn1_start_tag(&data, ASN1_APPLICATION(4));
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asn1_read_OctetString(&data, &os1);
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_read_OctetString(&data, &os2);
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asn1_start_tag(&data, ASN1_SET);
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asn1_read_OctetString(&data, &os3);
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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if (data.has_error) {
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data_blob_free(&blob);
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asn1_free(&data);
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DEBUG(1,("Failed to parse cldap reply\n"));
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return -1;
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}
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p = (char *)os3.data;
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reply->type = IVAL(p, 0); p += 4;
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reply->flags = IVAL(p, 0); p += 4;
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memcpy(&reply->guid.info, p, UUID_FLAT_SIZE);
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p += UUID_FLAT_SIZE;
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p += pull_netlogon_string(reply->forest, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->domain, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->hostname, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->netbios_domain, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->netbios_hostname, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->unk, p, (const char *)os3.data);
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if (reply->type == SAMLOGON_AD_R) {
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p += pull_netlogon_string(reply->user_name, p, (const char *)os3.data);
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} else {
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*reply->user_name = 0;
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}
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p += pull_netlogon_string(reply->server_site_name, p, (const char *)os3.data);
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p += pull_netlogon_string(reply->client_site_name, p, (const char *)os3.data);
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reply->version = IVAL(p, 0);
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reply->lmnt_token = SVAL(p, 4);
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reply->lm20_token = SVAL(p, 6);
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data_blob_free(&os1);
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data_blob_free(&os2);
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data_blob_free(&os3);
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data_blob_free(&blob);
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asn1_free(&data);
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return 0;
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}
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/*******************************************************************
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do a cldap netlogon query. Always 389/udp
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*******************************************************************/
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BOOL ads_cldap_netlogon(const char *server, const char *realm, struct cldap_netlogon_reply *reply)
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{
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int sock;
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int ret;
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sock = open_udp_socket(server, LDAP_PORT );
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if (sock == -1) {
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DEBUG(2,("ads_cldap_netlogon: Failed to open udp socket to %s\n",
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server));
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return False;
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}
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ret = send_cldap_netlogon(sock, realm, global_myname(), 6);
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if (ret != 0) {
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close(sock);
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return False;
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}
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ret = recv_cldap_netlogon(sock, reply);
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close(sock);
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if (ret == -1) {
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return False;
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}
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return True;
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}
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