--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ simple kerberos5/SPNEGO routines
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
+ Copyright (C) Luke Howard 2003
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/*
+ generate a negTokenInit packet given a GUID, a list of supported
+ OIDs (the mechanisms) and a principal name string
+*/
+DATA_BLOB spnego_gen_negTokenInit(char guid[16],
+ const char *OIDs[],
+ const char *principal)
+{
+ int i;
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_write(&data, guid, 16);
+ asn1_push_tag(&data,ASN1_APPLICATION(0));
+ asn1_write_OID(&data,OID_SPNEGO);
+ asn1_push_tag(&data,ASN1_CONTEXT(0));
+ asn1_push_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data,ASN1_CONTEXT(0));
+ asn1_push_tag(&data,ASN1_SEQUENCE(0));
+ for (i=0; OIDs[i]; i++) {
+ asn1_write_OID(&data,OIDs[i]);
+ }
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data, ASN1_CONTEXT(3));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_write_GeneralString(&data,principal);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+/*
+ Generate a negTokenInit as used by the client side ... It has a mechType
+ (OID), and a mechToken (a security blob) ...
+
+ Really, we need to break out the NTLMSSP stuff as well, because it could be
+ raw in the packets!
+*/
+DATA_BLOB gen_negTokenInit(const char *OID, DATA_BLOB blob)
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_APPLICATION(0));
+ asn1_write_OID(&data,OID_SPNEGO);
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ asn1_write_OID(&data, OID);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data, ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data,blob.data,blob.length);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+/*
+ parse a negTokenInit packet giving a GUID, a list of supported
+ OIDs (the mechanisms) and a principal name string
+*/
+BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
+ char *OIDs[ASN1_MAX_OIDS],
+ char **principal)
+{
+ int i;
+ BOOL ret;
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+
+ asn1_start_tag(&data,ASN1_APPLICATION(0));
+ asn1_check_OID(&data,OID_SPNEGO);
+ asn1_start_tag(&data,ASN1_CONTEXT(0));
+ asn1_start_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_start_tag(&data,ASN1_CONTEXT(0));
+ asn1_start_tag(&data,ASN1_SEQUENCE(0));
+ for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
+ char *oid_str = NULL;
+ asn1_read_OID(&data,&oid_str);
+ OIDs[i] = oid_str;
+ }
+ OIDs[i] = NULL;
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data, ASN1_CONTEXT(3));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_read_GeneralString(&data,principal);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+ asn1_free(&data);
+ return ret;
+}
+
+
+/*
+ generate a negTokenTarg packet given a list of OIDs and a security blob
+*/
+DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
+{
+ int i;
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_APPLICATION(0));
+ asn1_write_OID(&data,OID_SPNEGO);
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ for (i=0; OIDs[i]; i++) {
+ asn1_write_OID(&data,OIDs[i]);
+ }
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data, ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data,blob.data,blob.length);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+
+/*
+ parse a negTokenTarg packet giving a list of OIDs and a security blob
+*/
+BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
+{
+ int i;
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_APPLICATION(0));
+ asn1_check_OID(&data,OID_SPNEGO);
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
+ char *oid_str = NULL;
+ asn1_read_OID(&data,&oid_str);
+ OIDs[i] = oid_str;
+ }
+ OIDs[i] = NULL;
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data, ASN1_CONTEXT(2));
+ asn1_read_OctetString(&data,secblob);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ return False;
+ }
+
+ asn1_free(&data);
+ return True;
+}
+
+/*
+ generate a krb5 GSS-API wrapper packet given a ticket
+*/
+DATA_BLOB spnego_gen_krb5_wrap(const DATA_BLOB ticket, const uint8 tok_id[2])
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_APPLICATION(0));
+ asn1_write_OID(&data, OID_KERBEROS5);
+
+ asn1_write(&data, tok_id, 2);
+ asn1_write(&data, ticket.data, ticket.length);
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+/*
+ parse a krb5 GSS-API wrapper packet giving a ticket
+*/
+BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
+{
+ BOOL ret;
+ ASN1_DATA data;
+ int data_remaining;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_APPLICATION(0));
+ asn1_check_OID(&data, OID_KERBEROS5);
+
+ data_remaining = asn1_tag_remaining(&data);
+
+ if (data_remaining < 3) {
+ data.has_error = True;
+ } else {
+ asn1_read(&data, tok_id, 2);
+ data_remaining -= 2;
+ *ticket = data_blob(NULL, data_remaining);
+ asn1_read(&data, ticket->data, ticket->length);
+ }
+
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+
+ asn1_free(&data);
+
+ return ret;
+}
+
+
+/*
+ generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
+ kerberos session setup
+*/
+int spnego_gen_negTokenTarg(const char *principal, int time_offset,
+ DATA_BLOB *targ,
+ DATA_BLOB *session_key_krb5, uint32 extra_ap_opts)
+{
+ int retval;
+ DATA_BLOB tkt, tkt_wrapped;
+ const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
+
+ /* get a kerberos ticket for the service and extract the session key */
+ retval = cli_krb5_get_ticket(principal, time_offset,
+ &tkt, session_key_krb5, extra_ap_opts);
+
+ if (retval)
+ return retval;
+
+ /* wrap that up in a nice GSS-API wrapping */
+ tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);
+
+ /* and wrap that in a shiny SPNEGO wrapper */
+ *targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
+
+ data_blob_free(&tkt_wrapped);
+ data_blob_free(&tkt);
+
+ return retval;
+}
+
+
+/*
+ parse a spnego NTLMSSP challenge packet giving two security blobs
+*/
+BOOL spnego_parse_challenge(const DATA_BLOB blob,
+ DATA_BLOB *chal1, DATA_BLOB *chal2)
+{
+ BOOL ret;
+ ASN1_DATA data;
+
+ ZERO_STRUCTP(chal1);
+ ZERO_STRUCTP(chal2);
+
+ 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,1);
+ asn1_end_tag(&data);
+
+ 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, chal1);
+ asn1_end_tag(&data);
+
+ /* the second challenge is optional (XP doesn't send it) */
+ if (asn1_tag_remaining(&data)) {
+ asn1_start_tag(&data,ASN1_CONTEXT(3));
+ asn1_read_OctetString(&data, chal2);
+ asn1_end_tag(&data);
+ }
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+ asn1_free(&data);
+ return ret;
+}
+
+
+/*
+ generate a SPNEGO auth packet. This will contain the encrypted passwords
+*/
+DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_CONTEXT(1));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ asn1_push_tag(&data, ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data,blob.data,blob.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(DATA_BLOB blob, DATA_BLOB *auth)
+{
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_CONTEXT(1));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ 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 failed at %d\n", (int)data.ofs));
+ asn1_free(&data);
+ return False;
+ }
+
+ asn1_free(&data);
+ return True;
+}
+
+/*
+ generate a minimal SPNEGO response packet. Doesn't contain much.
+*/
+DATA_BLOB spnego_gen_auth_response(DATA_BLOB *reply, NTSTATUS nt_status,
+ const char *mechOID)
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+ 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;
+ }
+
+ 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;
+}
+
projects / samba / blobdiff