mirror of
https://github.com/samba-team/samba.git
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69cee2a3ec
For the winbind cached ADS LDAP connection handling (ads_cached_connection()) we were (incorrectly) assuming that the service ticket lifetime equaled the tgt lifetime. For setups where the service ticket just lives 10 minutes, we were leaving hundreds of LDAP connections in CLOSE_WAIT state, until we fail to service entirely with "Too many open files". Also sequence_number() in winbindd_ads.c needs to delete the cached LDAP connection after the ads_do_search_retry() has failed to submit the search request (although the bind succeeded (returning an expired service ticket that we cannot delete from the memory cred cache - this will get fixed later)). Guenther (This used to be commit 7e1a84b7226fb8dcd5d34c64a3478a6d886a9a91)
567 lines
13 KiB
C
567 lines
13 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(char 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-1; i++) {
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char *oid_str = NULL;
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asn1_read_OID(&data,&oid_str);
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OIDs[i] = oid_str;
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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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*principal = NULL;
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if (asn1_tag_remaining(&data) > 0) {
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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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}
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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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if (data.has_error) {
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int j;
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SAFE_FREE(*principal);
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for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
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SAFE_FREE(OIDs[j]);
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}
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}
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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-1; i++) {
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char *oid_str = NULL;
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asn1_read_OID(&data,&oid_str);
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OIDs[i] = oid_str;
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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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int j;
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data_blob_free(secblob);
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for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
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SAFE_FREE(OIDs[j]);
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}
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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(const 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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if (data.has_error) {
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data_blob_free(ticket);
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}
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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, uint32 extra_ap_opts,
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time_t *expire_time)
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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,
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&tkt, session_key_krb5, extra_ap_opts, NULL,
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expire_time);
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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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if (data.has_error) {
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data_blob_free(chal1);
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data_blob_free(chal2);
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}
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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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data_blob_free(auth);
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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);
|
|
|
|
asn1_push_tag(&data, ASN1_CONTEXT(1));
|
|
asn1_push_tag(&data, ASN1_SEQUENCE(0));
|
|
asn1_push_tag(&data, ASN1_CONTEXT(0));
|
|
asn1_write_enumerated(&data, negResult);
|
|
asn1_pop_tag(&data);
|
|
|
|
if (reply->data != NULL) {
|
|
asn1_push_tag(&data,ASN1_CONTEXT(1));
|
|
asn1_write_OID(&data, mechOID);
|
|
asn1_pop_tag(&data);
|
|
|
|
asn1_push_tag(&data,ASN1_CONTEXT(2));
|
|
asn1_write_OctetString(&data, reply->data, reply->length);
|
|
asn1_pop_tag(&data);
|
|
}
|
|
|
|
asn1_pop_tag(&data);
|
|
asn1_pop_tag(&data);
|
|
|
|
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;
|
|
}
|