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1433501822
Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Günther Deschner <gd@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
206 lines
5.0 KiB
C
206 lines
5.0 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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Copyright (C) Jeremy Allison 2010
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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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#include "../libcli/auth/spnego.h"
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#include "smb_krb5.h"
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#include "../lib/util/asn1.h"
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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(TALLOC_CTX *ctx,
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DATA_BLOB blob,
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char *OIDs[ASN1_MAX_OIDS],
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char **principal,
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DATA_BLOB *secblob)
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{
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int i;
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bool ret = false;
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ASN1_DATA *data;
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for (i = 0; i < ASN1_MAX_OIDS; i++) {
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OIDs[i] = NULL;
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}
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if (principal) {
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*principal = NULL;
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}
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if (secblob) {
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*secblob = data_blob_null;
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}
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data = asn1_init(talloc_tos());
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if (data == NULL) {
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return false;
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}
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if (!asn1_load(data, blob)) goto err;
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if (!asn1_start_tag(data,ASN1_APPLICATION(0))) goto err;
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if (!asn1_check_OID(data,OID_SPNEGO)) goto err;
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/* negTokenInit [0] NegTokenInit */
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if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
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if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;
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/* mechTypes [0] MechTypeList OPTIONAL */
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/* Not really optional, we depend on this to decide
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* what mechanisms we have to work with. */
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if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
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if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;
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for (i=0; asn1_tag_remaining(data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
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if (!asn1_read_OID(data,ctx, &OIDs[i])) {
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goto err;
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}
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if (asn1_has_error(data)) {
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goto err;
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}
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}
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OIDs[i] = NULL;
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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/*
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Win7 + Live Sign-in Assistant attaches a mechToken
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ASN1_CONTEXT(2) to the negTokenInit packet
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which breaks our negotiation if we just assume
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the next tag is ASN1_CONTEXT(3).
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*/
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if (asn1_peek_tag(data, ASN1_CONTEXT(1))) {
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uint8_t flags;
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/* reqFlags [1] ContextFlags OPTIONAL */
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if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
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if (!asn1_start_tag(data, ASN1_BIT_STRING)) goto err;
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while (asn1_tag_remaining(data) > 0) {
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if (!asn1_read_uint8(data, &flags)) goto err;
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}
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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}
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if (asn1_peek_tag(data, ASN1_CONTEXT(2))) {
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DATA_BLOB sblob = data_blob_null;
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/* mechToken [2] OCTET STRING OPTIONAL */
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if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
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if (!asn1_read_OctetString(data, ctx, &sblob)) goto err;
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if (!asn1_end_tag(data)) {
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data_blob_free(&sblob);
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goto err;
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}
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if (secblob) {
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*secblob = sblob;
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} else {
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data_blob_free(&sblob);
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}
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}
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if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
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char *princ = NULL;
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/* mechListMIC [3] OCTET STRING OPTIONAL */
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if (!asn1_start_tag(data, ASN1_CONTEXT(3))) goto err;
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if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
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if (!asn1_start_tag(data, ASN1_CONTEXT(0))) goto err;
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if (!asn1_read_GeneralString(data, ctx, &princ)) goto err;
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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if (principal) {
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*principal = princ;
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} else {
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TALLOC_FREE(princ);
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}
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}
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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if (!asn1_end_tag(data)) goto err;
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ret = !asn1_has_error(data);
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err:
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if (asn1_has_error(data)) {
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int j;
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if (principal) {
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TALLOC_FREE(*principal);
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}
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if (secblob) {
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data_blob_free(secblob);
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}
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for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
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TALLOC_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 krb5 GSS-API wrapper packet given a ticket
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*/
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DATA_BLOB spnego_gen_krb5_wrap(TALLOC_CTX *ctx, const DATA_BLOB ticket, const uint8_t tok_id[2])
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{
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ASN1_DATA *data;
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DATA_BLOB ret = data_blob_null;
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data = asn1_init(talloc_tos());
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if (data == NULL) {
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return data_blob_null;
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}
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if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
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if (!asn1_write_OID(data, OID_KERBEROS5)) goto err;
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if (!asn1_write(data, tok_id, 2)) goto err;
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if (!asn1_write(data, ticket.data, ticket.length)) goto err;
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if (!asn1_pop_tag(data)) goto err;
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if (!asn1_extract_blob(data, ctx, &ret)) {
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goto err;
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}
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asn1_free(data);
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data = NULL;
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err:
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if (data != NULL) {
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if (asn1_has_error(data)) {
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DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
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(int)asn1_current_ofs(data)));
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}
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asn1_free(data);
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}
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return ret;
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}
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