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samba-mirror/source3/nmbd/nmbd_processlogon.c
Jeremy Allison 0a2cc569a1 r22045: As Volker noticed, skip_string's last argument is
redundent. Remove it.
Jeremy.
(This used to be commit 140881cfbb)
2007-10-10 12:19:05 -05:00

624 lines
17 KiB
C

/*
Unix SMB/CIFS implementation.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) Luke Kenneth Casson Leighton 1994-1998
Copyright (C) Jeremy Allison 1994-2003
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
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.
Revision History:
*/
#include "includes.h"
struct sam_database_info {
uint32 index;
uint32 serial_lo, serial_hi;
uint32 date_lo, date_hi;
};
/****************************************************************************
Send a message to smbd to do a sam delta sync
**************************************************************************/
static void send_repl_message(uint32 low_serial)
{
TDB_CONTEXT *tdb;
tdb = tdb_open_log(lock_path("connections.tdb"), 0,
TDB_DEFAULT, O_RDONLY, 0);
if (!tdb) {
DEBUG(3, ("send_repl_message(): failed to open connections "
"database\n"));
return;
}
DEBUG(3, ("sending replication message, serial = 0x%04x\n",
low_serial));
message_send_all(tdb, MSG_SMB_SAM_REPL, &low_serial,
sizeof(low_serial), False, NULL);
tdb_close(tdb);
}
/****************************************************************************
Process a domain logon packet
**************************************************************************/
void process_logon_packet(struct packet_struct *p, char *buf,int len,
const char *mailslot)
{
struct dgram_packet *dgram = &p->packet.dgram;
pstring my_name;
fstring reply_name;
pstring outbuf;
int code;
uint16 token = 0;
uint32 ntversion = 0;
uint16 lmnttoken = 0;
uint16 lm20token = 0;
uint32 domainsidsize;
BOOL short_request = False;
char *getdc;
char *uniuser; /* Unicode user name. */
pstring ascuser;
char *unicomp; /* Unicode computer name. */
memset(outbuf, 0, sizeof(outbuf));
if (!lp_domain_logons()) {
DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
logons are not enabled.\n", inet_ntoa(p->ip) ));
return;
}
pstrcpy(my_name, global_myname());
code = get_safe_SVAL(buf,len,buf,0,-1);
DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
switch (code) {
case 0:
{
fstring mach_str, user_str, getdc_str;
char *q = buf + 2;
char *machine = q;
char *user = skip_string(buf,len,machine);
if (!user || PTR_DIFF(user, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
getdc = skip_string(buf,len,user);
if (!getdc || PTR_DIFF(getdc, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_string(buf,len,getdc);
if (!q || PTR_DIFF(q + 5, buf) > len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
token = SVAL(q,3);
fstrcpy(reply_name,my_name);
pull_ascii_fstring(mach_str, machine);
pull_ascii_fstring(user_str, user);
pull_ascii_fstring(getdc_str, getdc);
DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
mach_str,inet_ntoa(p->ip),user_str,token));
q = outbuf;
SSVAL(q, 0, 6);
q += 2;
fstrcpy(reply_name, "\\\\");
fstrcat(reply_name, my_name);
push_ascii_fstring(q, reply_name);
q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
SSVAL(q, 0, token);
q += 2;
dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
send_mailslot(True, getdc_str,
outbuf,PTR_DIFF(q,outbuf),
global_myname(), 0x0,
mach_str,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
break;
}
case QUERYFORPDC:
{
fstring mach_str, getdc_str;
fstring source_name;
char *q = buf + 2;
char *machine = q;
if (!lp_domain_master()) {
/* We're not Primary Domain Controller -- ignore this */
return;
}
getdc = skip_string(buf,len,machine);
if (!getdc || PTR_DIFF(getdc, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_string(buf,len,getdc);
if (!q || PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = ALIGN2(q, buf);
/* At this point we can work out if this is a W9X or NT style
request. Experiments show that the difference is wether the
packet ends here. For a W9X request we now end with a pair of
bytes (usually 0xFE 0xFF) whereas with NT we have two further
strings - the following is a simple way of detecting this */
if (len - PTR_DIFF(q, buf) <= 3) {
short_request = True;
} else {
unicomp = q;
if (PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
/* A full length (NT style) request */
q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
if (PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
if (len - PTR_DIFF(q, buf) > 8) {
/* with NT5 clients we can sometimes
get additional data - a length specificed string
containing the domain name, then 16 bytes of
data (no idea what it is) */
int dom_len = CVAL(q, 0);
q++;
if (dom_len != 0) {
q += dom_len + 1;
}
q += 16;
}
if (PTR_DIFF(q + 8, buf) > len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
ntversion = IVAL(q, 0);
lmnttoken = SVAL(q, 4);
lm20token = SVAL(q, 6);
}
/* Construct reply. */
q = outbuf;
SSVAL(q, 0, QUERYFORPDC_R);
q += 2;
fstrcpy(reply_name,my_name);
push_ascii_fstring(q, reply_name);
q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
/* PDC and domain name */
if (!short_request) {
/* Make a full reply */
q = ALIGN2(q, outbuf);
q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
SIVAL(q, 0, 1); /* our nt version */
SSVAL(q, 4, 0xffff); /* our lmnttoken */
SSVAL(q, 6, 0xffff); /* our lm20token */
q += 8;
}
/* RJS, 21-Feb-2000, we send a short reply if the request was short */
pull_ascii_fstring(mach_str, machine);
DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, \
reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
(uint32)lm20token ));
dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
pull_ascii_fstring(getdc_str, getdc);
pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
send_mailslot(True, getdc_str,
outbuf,PTR_DIFF(q,outbuf),
global_myname(), 0x0,
source_name,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
return;
}
case SAMLOGON:
{
fstring getdc_str;
fstring source_name;
char *q = buf + 2;
fstring asccomp;
q += 2;
if (PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
unicomp = q;
uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
if (PTR_DIFF(uniuser, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
if (PTR_DIFF(getdc, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_string(buf,len,getdc);
if (!q || PTR_DIFF(q + 8, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q += 4; /* Account Control Bits - indicating username type */
domainsidsize = IVAL(q, 0);
q += 4;
DEBUG(5,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
q += domainsidsize;
q = ALIGN4(q, buf);
}
DEBUG(5,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
if (len - PTR_DIFF(q, buf) > 8) {
/* with NT5 clients we can sometimes
get additional data - a length specificed string
containing the domain name, then 16 bytes of
data (no idea what it is) */
int dom_len = CVAL(q, 0);
q++;
if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
q += dom_len + 1;
}
q += 16;
}
if (PTR_DIFF(q + 8, buf) > len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
ntversion = IVAL(q, 0);
lmnttoken = SVAL(q, 4);
lm20token = SVAL(q, 6);
q += 8;
DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
/*
* we respond regadless of whether the machine is in our password
* database. If it isn't then we let smbd send an appropriate error.
* Let's ignore the SID.
*/
pull_ucs2_pstring(ascuser, uniuser);
pull_ucs2_fstring(asccomp, unicomp);
DEBUG(5,("process_logon_packet: SAMLOGON user %s\n", ascuser));
fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
fstrcat(reply_name, my_name);
DEBUG(5,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
SAMLOGON_R ,lmnttoken));
/* Construct reply. */
q = outbuf;
/* we want the simple version unless we are an ADS PDC..which means */
/* never, at least for now */
if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
if (SVAL(uniuser, 0) == 0) {
SSVAL(q, 0, SAMLOGON_UNK_R); /* user unknown */
} else {
SSVAL(q, 0, SAMLOGON_R);
}
q += 2;
q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
}
#ifdef HAVE_ADS
else {
struct GUID domain_guid;
UUID_FLAT flat_guid;
pstring domain;
pstring hostname;
char *component, *dc, *q1;
uint8 size;
char *q_orig = q;
int str_offset;
get_mydnsdomname(domain);
get_myname(hostname);
if (SVAL(uniuser, 0) == 0) {
SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
} else {
SIVAL(q, 0, SAMLOGON_AD_R);
}
q += 4;
SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
q += 4;
/* Push Domain GUID */
if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
return;
}
smb_uuid_pack(domain_guid, &flat_guid);
memcpy(q, &flat_guid.info, UUID_FLAT_SIZE);
q += UUID_FLAT_SIZE;
/* Forest */
str_offset = q - q_orig;
dc = domain;
q1 = q;
while ((component = strtok(dc, "."))) {
dc = NULL;
size = push_ascii(&q[1], component, -1, 0);
SCVAL(q, 0, size);
q += (size + 1);
}
/* Unk0 */
SCVAL(q, 0, 0);
q++;
/* Domain */
SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
SCVAL(q, 1, str_offset & 0xFF);
q += 2;
/* Hostname */
size = push_ascii(&q[1], hostname, -1, 0);
SCVAL(q, 0, size);
q += (size + 1);
SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
SCVAL(q, 1, str_offset & 0xFF);
q += 2;
/* NETBIOS of domain */
size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
SCVAL(q, 0, size);
q += (size + 1);
/* Unk1 */
SCVAL(q, 0, 0);
q++;
/* NETBIOS of hostname */
size = push_ascii(&q[1], my_name, -1, 0);
SCVAL(q, 0, size);
q += (size + 1);
/* Unk2 */
SCVAL(q, 0, 0);
q++;
/* User name */
if (SVAL(uniuser, 0) != 0) {
size = push_ascii(&q[1], ascuser, -1, 0);
SCVAL(q, 0, size);
q += (size + 1);
}
q_orig = q;
/* Site name */
size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
SCVAL(q, 0, size);
q += (size + 1);
/* Site name (2) */
str_offset = q - q_orig;
SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
SCVAL(q, 1, str_offset & 0xFF);
q += 2;
SCVAL(q, 0, PTR_DIFF(q,q1));
SCVAL(q, 1, 0x10); /* unknown */
SIVAL(q, 0, 0x00000002);
q += 4; /* unknown */
SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
q += 4;
SIVAL(q, 0, 0x00000000);
q += 4; /* unknown */
SIVAL(q, 0, 0x00000000);
q += 4; /* unknown */
}
#endif
/* tell the client what version we are */
SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
/* our ntversion */
SSVAL(q, 4, 0xffff); /* our lmnttoken */
SSVAL(q, 6, 0xffff); /* our lm20token */
q += 8;
dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
pull_ascii_fstring(getdc_str, getdc);
pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
send_mailslot(True, getdc,
outbuf,PTR_DIFF(q,outbuf),
global_myname(), 0x0,
source_name,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
break;
}
/* Announce change to UAS or SAM. Send by the domain controller when a
replication event is required. */
case SAM_UAS_CHANGE:
{
struct sam_database_info *db_info;
char *q = buf + 2;
int i, db_count;
uint32 low_serial;
/* Header */
if (PTR_DIFF(q + 16, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
low_serial = IVAL(q, 0); q += 4; /* Low serial number */
q += 4; /* Date/time */
q += 4; /* Pulse */
q += 4; /* Random */
/* Domain info */
q = skip_string(buf,len,q); /* PDC name */
if (!q || PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_string(buf,len,q); /* Domain name */
if (!q || PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode PDC name */
if (PTR_DIFF(q, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode domain name */
/* Database info */
if (PTR_DIFF(q + 2, buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
db_count = SVAL(q, 0); q += 2;
if (PTR_DIFF(q + (db_count*20), buf) >= len) {
DEBUG(0,("process_logon_packet: bad packet\n"));
return;
}
db_info = SMB_MALLOC_ARRAY(struct sam_database_info, db_count);
if (db_info == NULL) {
DEBUG(3, ("out of memory allocating info for %d databases\n", db_count));
return;
}
for (i = 0; i < db_count; i++) {
db_info[i].index = IVAL(q, 0);
db_info[i].serial_lo = IVAL(q, 4);
db_info[i].serial_hi = IVAL(q, 8);
db_info[i].date_lo = IVAL(q, 12);
db_info[i].date_hi = IVAL(q, 16);
q += 20;
}
/* Domain SID */
#if 0
/* We must range check this. */
q += IVAL(q, 0) + 4; /* 4 byte length plus data */
q += 2; /* Alignment? */
/* Misc other info */
q += 4; /* NT version (0x1) */
q += 2; /* LMNT token (0xff) */
q += 2; /* LM20 token (0xff) */
#endif
SAFE_FREE(db_info); /* Not sure whether we need to do anything useful with these */
/* Send message to smbd */
send_repl_message(low_serial);
break;
}
default:
DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
return;
}
}