mirror of
https://github.com/samba-team/samba.git
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30191d1a57
bugs in various places whilst doing this (places that assumed
BOOL == int). I also need to fix the Samba4 pidl generation
(next checkin).
Jeremy.
(This used to be commit f35a266b3c)
587 lines
14 KiB
C
587 lines
14 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 3 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, see <http://www.gnu.org/licenses/>.
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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_KERBEROS5, 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);
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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);
|
|
|
|
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 auth packet. This contains the encrypted passwords
|
|
*/
|
|
bool spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status,
|
|
const char *mechOID,
|
|
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);
|
|
|
|
*auth = data_blob_null;
|
|
|
|
if (asn1_tag_remaining(&data)) {
|
|
asn1_start_tag(&data,ASN1_CONTEXT(1));
|
|
asn1_check_OID(&data, mechOID);
|
|
asn1_end_tag(&data);
|
|
|
|
if (asn1_tag_remaining(&data)) {
|
|
asn1_start_tag(&data,ASN1_CONTEXT(2));
|
|
asn1_read_OctetString(&data, auth);
|
|
asn1_end_tag(&data);
|
|
}
|
|
} else if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
|
|
data.has_error = 1;
|
|
}
|
|
|
|
/* Binding against Win2K DC returns a duplicate of the responseToken in
|
|
* the optional mechListMIC field. This is a bug in Win2K. We ignore
|
|
* this field if it exists. Win2K8 may return a proper mechListMIC at
|
|
* which point we need to implement the integrity checking. */
|
|
if (asn1_tag_remaining(&data)) {
|
|
DATA_BLOB mechList = data_blob_null;
|
|
asn1_start_tag(&data, ASN1_CONTEXT(3));
|
|
asn1_read_OctetString(&data, &mechList);
|
|
asn1_end_tag(&data);
|
|
data_blob_free(&mechList);
|
|
DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
|
|
"ignoring.\n"));
|
|
}
|
|
|
|
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;
|
|
}
|