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7d068355aa
domains, this patch ensures that we always use the ADS backend when
security=ADS, and the remote server is capable.
The routines used for this behaviour have been upgraded to modern Samba
codeing standards.
This is a change in behaviour for mixed mode domains, and if the trusted
domain cannot be reached with our current krb5.conf file, we will show
that domain as disconnected.
This is in line with existing behaviour for native mode domains, and for
our primary domain.
As a consequence of testing this patch, I found that our kerberos error
handling was well below par - we would often throw away useful error
values. These changes move more routines to ADS_STATUS to return
kerberos errors.
Also found when valgrinding the setup, fix a few memory leaks.
While sniffing the resultant connections, I noticed we would query our
list of trusted domains twice - so I have reworked some of the code to
avoid that.
Andrew Bartlett
(This used to be commit 7c34de8096)
540 lines
12 KiB
C
540 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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simple kerberos5/SPNEGO routines
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
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Copyright (C) Luke Howard 2003
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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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generate a negTokenInit packet given a GUID, a list of supported
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OIDs (the mechanisms) and a principal name string
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*/
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DATA_BLOB spnego_gen_negTokenInit(uint8 guid[16],
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const char *OIDs[],
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const char *principal)
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{
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int i;
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ASN1_DATA data;
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DATA_BLOB ret;
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memset(&data, 0, sizeof(data));
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asn1_write(&data, guid, 16);
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asn1_push_tag(&data,ASN1_APPLICATION(0));
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asn1_write_OID(&data,OID_SPNEGO);
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asn1_push_tag(&data,ASN1_CONTEXT(0));
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asn1_push_tag(&data,ASN1_SEQUENCE(0));
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asn1_push_tag(&data,ASN1_CONTEXT(0));
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asn1_push_tag(&data,ASN1_SEQUENCE(0));
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for (i=0; OIDs[i]; i++) {
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asn1_write_OID(&data,OIDs[i]);
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}
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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_CONTEXT(3));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_write_GeneralString(&data,principal);
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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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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(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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}
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ret = data_blob(data.data, data.length);
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asn1_free(&data);
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return ret;
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}
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/*
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Generate a negTokenInit as used by the client side ... It has a mechType
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(OID), and a mechToken (a security blob) ...
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Really, we need to break out the NTLMSSP stuff as well, because it could be
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raw in the packets!
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*/
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DATA_BLOB gen_negTokenInit(const char *OID, DATA_BLOB blob)
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{
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ASN1_DATA data;
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DATA_BLOB ret;
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memset(&data, 0, sizeof(data));
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asn1_push_tag(&data, ASN1_APPLICATION(0));
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asn1_write_OID(&data,OID_SPNEGO);
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_write_OID(&data, OID);
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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_CONTEXT(2));
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asn1_write_OctetString(&data,blob.data,blob.length);
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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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asn1_pop_tag(&data);
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if (data.has_error) {
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DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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}
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ret = data_blob(data.data, data.length);
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asn1_free(&data);
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return ret;
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}
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/*
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parse a negTokenInit packet giving a GUID, a list of supported
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OIDs (the mechanisms) and a principal name string
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*/
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BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
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char *OIDs[ASN1_MAX_OIDS],
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char **principal)
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{
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int i;
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BOOL ret;
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ASN1_DATA data;
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asn1_load(&data, blob);
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asn1_start_tag(&data,ASN1_APPLICATION(0));
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asn1_check_OID(&data,OID_SPNEGO);
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asn1_start_tag(&data,ASN1_CONTEXT(0));
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asn1_start_tag(&data,ASN1_SEQUENCE(0));
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asn1_start_tag(&data,ASN1_CONTEXT(0));
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asn1_start_tag(&data,ASN1_SEQUENCE(0));
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for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
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char *oid = NULL;
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asn1_read_OID(&data,&oid);
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OIDs[i] = oid;
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}
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OIDs[i] = NULL;
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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asn1_start_tag(&data, ASN1_CONTEXT(3));
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_start_tag(&data, ASN1_CONTEXT(0));
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asn1_read_GeneralString(&data,principal);
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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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asn1_end_tag(&data);
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ret = !data.has_error;
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asn1_free(&data);
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return ret;
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}
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/*
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generate a negTokenTarg packet given a list of OIDs and a security blob
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*/
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DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
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{
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int i;
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ASN1_DATA data;
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DATA_BLOB ret;
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memset(&data, 0, sizeof(data));
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asn1_push_tag(&data, ASN1_APPLICATION(0));
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asn1_write_OID(&data,OID_SPNEGO);
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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for (i=0; OIDs[i]; i++) {
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asn1_write_OID(&data,OIDs[i]);
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}
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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_CONTEXT(2));
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asn1_write_OctetString(&data,blob.data,blob.length);
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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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asn1_pop_tag(&data);
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if (data.has_error) {
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DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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}
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ret = data_blob(data.data, data.length);
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asn1_free(&data);
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return ret;
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}
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/*
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parse a negTokenTarg packet giving a list of OIDs and a security blob
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*/
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BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
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{
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int i;
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ASN1_DATA data;
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asn1_load(&data, blob);
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asn1_start_tag(&data, ASN1_APPLICATION(0));
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asn1_check_OID(&data,OID_SPNEGO);
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asn1_start_tag(&data, ASN1_CONTEXT(0));
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_start_tag(&data, ASN1_CONTEXT(0));
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
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char *oid = NULL;
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asn1_read_OID(&data,&oid);
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OIDs[i] = oid;
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}
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OIDs[i] = NULL;
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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asn1_start_tag(&data, ASN1_CONTEXT(2));
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asn1_read_OctetString(&data,secblob);
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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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DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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return False;
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}
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asn1_free(&data);
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return True;
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}
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/*
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generate a krb5 GSS-API wrapper packet given a ticket
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*/
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DATA_BLOB spnego_gen_krb5_wrap(DATA_BLOB ticket, const uint8 tok_id[2])
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{
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ASN1_DATA data;
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DATA_BLOB ret;
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memset(&data, 0, sizeof(data));
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asn1_push_tag(&data, ASN1_APPLICATION(0));
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asn1_write_OID(&data, OID_KERBEROS5);
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asn1_write(&data, tok_id, 2);
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asn1_write(&data, ticket.data, ticket.length);
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asn1_pop_tag(&data);
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if (data.has_error) {
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DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
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asn1_free(&data);
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}
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ret = data_blob(data.data, data.length);
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asn1_free(&data);
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return ret;
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}
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/*
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parse a krb5 GSS-API wrapper packet giving a ticket
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*/
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BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
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{
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BOOL ret;
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ASN1_DATA data;
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int data_remaining;
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asn1_load(&data, blob);
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asn1_start_tag(&data, ASN1_APPLICATION(0));
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asn1_check_OID(&data, OID_KERBEROS5);
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data_remaining = asn1_tag_remaining(&data);
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if (data_remaining < 3) {
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data.has_error = True;
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} else {
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asn1_read(&data, tok_id, 2);
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data_remaining -= 2;
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*ticket = data_blob(NULL, data_remaining);
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asn1_read(&data, ticket->data, ticket->length);
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}
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asn1_end_tag(&data);
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ret = !data.has_error;
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asn1_free(&data);
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return ret;
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}
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/*
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generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
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kerberos session setup
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*/
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int spnego_gen_negTokenTarg(const char *principal, int time_offset,
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DATA_BLOB *targ,
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DATA_BLOB *session_key_krb5)
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{
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int retval;
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DATA_BLOB tkt, tkt_wrapped;
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const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
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/* get a kerberos ticket for the service and extract the session key */
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retval = cli_krb5_get_ticket(principal, time_offset, &tkt, session_key_krb5);
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if (retval)
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return retval;
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/* wrap that up in a nice GSS-API wrapping */
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tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);
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/* and wrap that in a shiny SPNEGO wrapper */
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*targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
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data_blob_free(&tkt_wrapped);
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data_blob_free(&tkt);
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return retval;
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}
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/*
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parse a spnego NTLMSSP challenge packet giving two security blobs
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*/
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BOOL spnego_parse_challenge(const DATA_BLOB blob,
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DATA_BLOB *chal1, DATA_BLOB *chal2)
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{
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BOOL ret;
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ASN1_DATA data;
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ZERO_STRUCTP(chal1);
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ZERO_STRUCTP(chal2);
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asn1_load(&data, blob);
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asn1_start_tag(&data,ASN1_CONTEXT(1));
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asn1_start_tag(&data,ASN1_SEQUENCE(0));
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asn1_start_tag(&data,ASN1_CONTEXT(0));
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asn1_check_enumerated(&data,1);
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asn1_end_tag(&data);
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asn1_start_tag(&data,ASN1_CONTEXT(1));
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asn1_check_OID(&data, OID_NTLMSSP);
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asn1_end_tag(&data);
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asn1_start_tag(&data,ASN1_CONTEXT(2));
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asn1_read_OctetString(&data, chal1);
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asn1_end_tag(&data);
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/* the second challenge is optional (XP doesn't send it) */
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if (asn1_tag_remaining(&data)) {
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asn1_start_tag(&data,ASN1_CONTEXT(3));
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asn1_read_OctetString(&data, chal2);
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asn1_end_tag(&data);
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}
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asn1_end_tag(&data);
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asn1_end_tag(&data);
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ret = !data.has_error;
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asn1_free(&data);
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return ret;
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}
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/*
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generate a SPNEGO auth packet. This will contain the encrypted passwords
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*/
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DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
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{
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ASN1_DATA data;
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DATA_BLOB ret;
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memset(&data, 0, sizeof(data));
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asn1_push_tag(&data, ASN1_CONTEXT(1));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_push_tag(&data, ASN1_CONTEXT(2));
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asn1_write_OctetString(&data,blob.data,blob.length);
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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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ret = data_blob(data.data, data.length);
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asn1_free(&data);
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return ret;
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}
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/*
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parse a SPNEGO auth packet. This contains the encrypted passwords
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*/
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BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
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{
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ASN1_DATA data;
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asn1_load(&data, blob);
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asn1_start_tag(&data, ASN1_CONTEXT(1));
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asn1_start_tag(&data, ASN1_SEQUENCE(0));
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asn1_start_tag(&data, ASN1_CONTEXT(2));
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asn1_read_OctetString(&data,auth);
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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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DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
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asn1_free(&data);
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return False;
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}
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asn1_free(&data);
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return True;
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}
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/*
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generate a minimal SPNEGO response packet. Doesn't contain much.
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*/
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DATA_BLOB spnego_gen_auth_response(DATA_BLOB *reply, NTSTATUS nt_status,
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const char *mechOID)
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{
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ASN1_DATA data;
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DATA_BLOB ret;
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uint8 negResult;
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if (NT_STATUS_IS_OK(nt_status)) {
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negResult = SPNEGO_NEG_RESULT_ACCEPT;
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} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
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negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
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} else {
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negResult = SPNEGO_NEG_RESULT_REJECT;
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}
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ZERO_STRUCT(data);
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asn1_push_tag(&data, ASN1_CONTEXT(1));
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asn1_push_tag(&data, ASN1_SEQUENCE(0));
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asn1_push_tag(&data, ASN1_CONTEXT(0));
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asn1_write_enumerated(&data, negResult);
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asn1_pop_tag(&data);
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if (reply->data != NULL) {
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asn1_push_tag(&data,ASN1_CONTEXT(1));
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asn1_write_OID(&data, mechOID);
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asn1_pop_tag(&data);
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asn1_push_tag(&data,ASN1_CONTEXT(2));
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asn1_write_OctetString(&data, reply->data, reply->length);
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asn1_pop_tag(&data);
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}
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asn1_pop_tag(&data);
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asn1_pop_tag(&data);
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ret = data_blob(data.data, data.length);
|
|
asn1_free(&data);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
|
|
*/
|
|
BOOL spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status,
|
|
DATA_BLOB *auth)
|
|
{
|
|
ASN1_DATA data;
|
|
uint8 negResult;
|
|
|
|
if (NT_STATUS_IS_OK(nt_status)) {
|
|
negResult = SPNEGO_NEG_RESULT_ACCEPT;
|
|
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
|
|
negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
|
|
} else {
|
|
negResult = SPNEGO_NEG_RESULT_REJECT;
|
|
}
|
|
|
|
asn1_load(&data, blob);
|
|
asn1_start_tag(&data, ASN1_CONTEXT(1));
|
|
asn1_start_tag(&data, ASN1_SEQUENCE(0));
|
|
asn1_start_tag(&data, ASN1_CONTEXT(0));
|
|
asn1_check_enumerated(&data, negResult);
|
|
asn1_end_tag(&data);
|
|
|
|
if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
|
|
asn1_start_tag(&data,ASN1_CONTEXT(1));
|
|
asn1_check_OID(&data, OID_NTLMSSP);
|
|
asn1_end_tag(&data);
|
|
|
|
asn1_start_tag(&data,ASN1_CONTEXT(2));
|
|
asn1_read_OctetString(&data, auth);
|
|
asn1_end_tag(&data);
|
|
}
|
|
|
|
asn1_end_tag(&data);
|
|
asn1_end_tag(&data);
|
|
|
|
if (data.has_error) {
|
|
DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data.ofs));
|
|
asn1_free(&data);
|
|
data_blob_free(auth);
|
|
return False;
|
|
}
|
|
|
|
asn1_free(&data);
|
|
return True;
|
|
}
|
|
|