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2d46e07c47
We should never be calling asn1_push_XXX functions inside an asn1 reading function. Change asn1_push_tag() -> asn1_start_tag() and asn1_pop_tag() -> asn1_end_tag(). This allows us to connect to a NetApp filer at the Microsoft plugfest. Andrew PLEASE CHECK ! Jeremy.
409 lines
9.7 KiB
C
409 lines
9.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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RFC2478 Compliant SPNEGO implementation
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Copyright (C) Jim McDonough <jmcd@us.ibm.com> 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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#include "../libcli/auth/spnego.h"
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#include "../lib/util/asn1.h"
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static bool read_negTokenInit(struct asn1_data *asn1, TALLOC_CTX *mem_ctx,
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struct spnego_negTokenInit *token)
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{
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ZERO_STRUCTP(token);
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asn1_start_tag(asn1, ASN1_CONTEXT(0));
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asn1_start_tag(asn1, ASN1_SEQUENCE(0));
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while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
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int i;
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uint8_t context;
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if (!asn1_peek_uint8(asn1, &context)) {
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asn1->has_error = true;
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break;
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}
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switch (context) {
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/* Read mechTypes */
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case ASN1_CONTEXT(0):
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asn1_start_tag(asn1, ASN1_CONTEXT(0));
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asn1_start_tag(asn1, ASN1_SEQUENCE(0));
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token->mechTypes = talloc(NULL, const char *);
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for (i = 0; !asn1->has_error &&
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0 < asn1_tag_remaining(asn1); i++) {
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token->mechTypes = talloc_realloc(NULL,
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token->mechTypes,
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const char *, i+2);
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asn1_read_OID(asn1, token->mechTypes, token->mechTypes + i);
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}
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token->mechTypes[i] = NULL;
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asn1_end_tag(asn1);
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asn1_end_tag(asn1);
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break;
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/* Read reqFlags */
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case ASN1_CONTEXT(1):
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asn1_start_tag(asn1, ASN1_CONTEXT(1));
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asn1_read_BitString(asn1, mem_ctx, &token->reqFlags,
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&token->reqFlagsPadding);
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asn1_end_tag(asn1);
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break;
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/* Read mechToken */
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case ASN1_CONTEXT(2):
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asn1_start_tag(asn1, ASN1_CONTEXT(2));
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asn1_read_OctetString(asn1, mem_ctx, &token->mechToken);
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asn1_end_tag(asn1);
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break;
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/* Read mecListMIC */
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case ASN1_CONTEXT(3):
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{
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uint8_t type_peek;
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asn1_start_tag(asn1, ASN1_CONTEXT(3));
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if (!asn1_peek_uint8(asn1, &type_peek)) {
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asn1->has_error = true;
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break;
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}
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if (type_peek == ASN1_OCTET_STRING) {
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asn1_read_OctetString(asn1, mem_ctx,
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&token->mechListMIC);
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} else {
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/* RFC 2478 says we have an Octet String here,
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but W2k sends something different... */
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char *mechListMIC;
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asn1_start_tag(asn1, ASN1_SEQUENCE(0));
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asn1_start_tag(asn1, ASN1_CONTEXT(0));
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asn1_read_GeneralString(asn1, mem_ctx, &mechListMIC);
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asn1_end_tag(asn1);
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asn1_end_tag(asn1);
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token->targetPrincipal = mechListMIC;
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}
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asn1_end_tag(asn1);
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break;
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}
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default:
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asn1->has_error = true;
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break;
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}
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}
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asn1_end_tag(asn1);
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asn1_end_tag(asn1);
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return !asn1->has_error;
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}
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static bool write_negTokenInit(struct asn1_data *asn1, struct spnego_negTokenInit *token)
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{
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asn1_push_tag(asn1, ASN1_CONTEXT(0));
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asn1_push_tag(asn1, ASN1_SEQUENCE(0));
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/* Write mechTypes */
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if (token->mechTypes && *token->mechTypes) {
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int i;
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asn1_push_tag(asn1, ASN1_CONTEXT(0));
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asn1_push_tag(asn1, ASN1_SEQUENCE(0));
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for (i = 0; token->mechTypes[i]; i++) {
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asn1_write_OID(asn1, token->mechTypes[i]);
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}
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asn1_pop_tag(asn1);
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asn1_pop_tag(asn1);
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}
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/* write reqFlags */
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if (token->reqFlags.length > 0) {
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asn1_push_tag(asn1, ASN1_CONTEXT(1));
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asn1_write_BitString(asn1, token->reqFlags.data,
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token->reqFlags.length,
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token->reqFlagsPadding);
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asn1_pop_tag(asn1);
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}
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/* write mechToken */
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if (token->mechToken.data) {
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asn1_push_tag(asn1, ASN1_CONTEXT(2));
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asn1_write_OctetString(asn1, token->mechToken.data,
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token->mechToken.length);
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asn1_pop_tag(asn1);
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}
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/* write mechListMIC */
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if (token->mechListMIC.data) {
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asn1_push_tag(asn1, ASN1_CONTEXT(3));
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#if 0
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/* This is what RFC 2478 says ... */
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asn1_write_OctetString(asn1, token->mechListMIC.data,
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token->mechListMIC.length);
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#else
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/* ... but unfortunately this is what Windows
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sends/expects */
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asn1_push_tag(asn1, ASN1_SEQUENCE(0));
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asn1_push_tag(asn1, ASN1_CONTEXT(0));
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asn1_push_tag(asn1, ASN1_GENERAL_STRING);
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asn1_write(asn1, token->mechListMIC.data,
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token->mechListMIC.length);
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asn1_pop_tag(asn1);
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asn1_pop_tag(asn1);
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asn1_pop_tag(asn1);
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#endif
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asn1_pop_tag(asn1);
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}
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asn1_pop_tag(asn1);
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asn1_pop_tag(asn1);
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return !asn1->has_error;
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}
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static bool read_negTokenTarg(struct asn1_data *asn1, TALLOC_CTX *mem_ctx,
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struct spnego_negTokenTarg *token)
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{
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ZERO_STRUCTP(token);
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asn1_start_tag(asn1, ASN1_CONTEXT(1));
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asn1_start_tag(asn1, ASN1_SEQUENCE(0));
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while (!asn1->has_error && 0 < asn1_tag_remaining(asn1)) {
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uint8_t context;
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if (!asn1_peek_uint8(asn1, &context)) {
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asn1->has_error = true;
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break;
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}
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switch (context) {
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case ASN1_CONTEXT(0):
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asn1_start_tag(asn1, ASN1_CONTEXT(0));
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asn1_start_tag(asn1, ASN1_ENUMERATED);
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asn1_read_uint8(asn1, &token->negResult);
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asn1_end_tag(asn1);
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asn1_end_tag(asn1);
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break;
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case ASN1_CONTEXT(1):
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asn1_start_tag(asn1, ASN1_CONTEXT(1));
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asn1_read_OID(asn1, mem_ctx, &token->supportedMech);
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asn1_end_tag(asn1);
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break;
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case ASN1_CONTEXT(2):
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asn1_start_tag(asn1, ASN1_CONTEXT(2));
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asn1_read_OctetString(asn1, mem_ctx, &token->responseToken);
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asn1_end_tag(asn1);
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break;
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case ASN1_CONTEXT(3):
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asn1_start_tag(asn1, ASN1_CONTEXT(3));
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asn1_read_OctetString(asn1, mem_ctx, &token->mechListMIC);
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asn1_end_tag(asn1);
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break;
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default:
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asn1->has_error = true;
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break;
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}
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}
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asn1_end_tag(asn1);
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asn1_end_tag(asn1);
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return !asn1->has_error;
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}
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static bool write_negTokenTarg(struct asn1_data *asn1, struct spnego_negTokenTarg *token)
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{
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asn1_push_tag(asn1, ASN1_CONTEXT(1));
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asn1_push_tag(asn1, ASN1_SEQUENCE(0));
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if (token->negResult != SPNEGO_NONE_RESULT) {
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asn1_push_tag(asn1, ASN1_CONTEXT(0));
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asn1_write_enumerated(asn1, token->negResult);
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asn1_pop_tag(asn1);
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}
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if (token->supportedMech) {
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asn1_push_tag(asn1, ASN1_CONTEXT(1));
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asn1_write_OID(asn1, token->supportedMech);
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asn1_pop_tag(asn1);
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}
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if (token->responseToken.data) {
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asn1_push_tag(asn1, ASN1_CONTEXT(2));
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asn1_write_OctetString(asn1, token->responseToken.data,
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token->responseToken.length);
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asn1_pop_tag(asn1);
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}
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if (token->mechListMIC.data) {
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asn1_push_tag(asn1, ASN1_CONTEXT(3));
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asn1_write_OctetString(asn1, token->mechListMIC.data,
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token->mechListMIC.length);
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asn1_pop_tag(asn1);
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}
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asn1_pop_tag(asn1);
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asn1_pop_tag(asn1);
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return !asn1->has_error;
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}
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ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data *token)
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{
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struct asn1_data *asn1;
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ssize_t ret = -1;
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uint8_t context;
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ZERO_STRUCTP(token);
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if (data.length == 0) {
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return ret;
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}
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asn1 = asn1_init(mem_ctx);
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if (asn1 == NULL) {
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return -1;
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}
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asn1_load(asn1, data);
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if (!asn1_peek_uint8(asn1, &context)) {
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asn1->has_error = true;
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} else {
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switch (context) {
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case ASN1_APPLICATION(0):
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asn1_start_tag(asn1, ASN1_APPLICATION(0));
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asn1_check_OID(asn1, OID_SPNEGO);
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if (read_negTokenInit(asn1, mem_ctx, &token->negTokenInit)) {
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token->type = SPNEGO_NEG_TOKEN_INIT;
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}
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asn1_end_tag(asn1);
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break;
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case ASN1_CONTEXT(1):
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if (read_negTokenTarg(asn1, mem_ctx, &token->negTokenTarg)) {
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token->type = SPNEGO_NEG_TOKEN_TARG;
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}
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break;
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default:
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asn1->has_error = true;
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break;
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}
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}
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if (!asn1->has_error) ret = asn1->ofs;
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asn1_free(asn1);
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return ret;
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}
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ssize_t spnego_write_data(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, struct spnego_data *spnego)
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{
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struct asn1_data *asn1 = asn1_init(mem_ctx);
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ssize_t ret = -1;
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if (asn1 == NULL) {
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return -1;
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}
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switch (spnego->type) {
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case SPNEGO_NEG_TOKEN_INIT:
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asn1_push_tag(asn1, ASN1_APPLICATION(0));
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asn1_write_OID(asn1, OID_SPNEGO);
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write_negTokenInit(asn1, &spnego->negTokenInit);
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asn1_pop_tag(asn1);
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break;
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case SPNEGO_NEG_TOKEN_TARG:
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write_negTokenTarg(asn1, &spnego->negTokenTarg);
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break;
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default:
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asn1->has_error = true;
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break;
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}
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if (!asn1->has_error) {
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*blob = data_blob_talloc(mem_ctx, asn1->data, asn1->length);
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ret = asn1->ofs;
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}
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asn1_free(asn1);
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return ret;
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}
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bool spnego_free_data(struct spnego_data *spnego)
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{
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bool ret = true;
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if (!spnego) goto out;
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switch(spnego->type) {
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case SPNEGO_NEG_TOKEN_INIT:
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if (spnego->negTokenInit.mechTypes) {
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talloc_free(spnego->negTokenInit.mechTypes);
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}
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data_blob_free(&spnego->negTokenInit.reqFlags);
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data_blob_free(&spnego->negTokenInit.mechToken);
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data_blob_free(&spnego->negTokenInit.mechListMIC);
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talloc_free(spnego->negTokenInit.targetPrincipal);
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break;
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case SPNEGO_NEG_TOKEN_TARG:
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if (spnego->negTokenTarg.supportedMech) {
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talloc_free(discard_const(spnego->negTokenTarg.supportedMech));
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}
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data_blob_free(&spnego->negTokenTarg.responseToken);
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data_blob_free(&spnego->negTokenTarg.mechListMIC);
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break;
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default:
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ret = false;
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break;
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}
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ZERO_STRUCTP(spnego);
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out:
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return ret;
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}
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bool spnego_write_mech_types(TALLOC_CTX *mem_ctx,
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const char **mech_types,
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DATA_BLOB *blob)
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{
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struct asn1_data *asn1 = asn1_init(mem_ctx);
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/* Write mechTypes */
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if (mech_types && *mech_types) {
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int i;
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asn1_push_tag(asn1, ASN1_SEQUENCE(0));
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for (i = 0; mech_types[i]; i++) {
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asn1_write_OID(asn1, mech_types[i]);
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}
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asn1_pop_tag(asn1);
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}
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if (asn1->has_error) {
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asn1_free(asn1);
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return false;
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}
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*blob = data_blob_talloc(mem_ctx, asn1->data, asn1->length);
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if (blob->length != asn1->length) {
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asn1_free(asn1);
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return false;
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}
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asn1_free(asn1);
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return true;
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}
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