5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
295 lines
7.6 KiB
C
295 lines
7.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <gssapi/gssapi.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "mech_switch.h"
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#include "context.h"
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#include "cred.h"
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#include "name.h"
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#include "utils.h"
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static OM_uint32
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parse_header(const gss_buffer_t input_token, gss_OID mech_oid)
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{
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unsigned char *p = input_token->value;
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size_t len = input_token->length;
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size_t a, b;
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/*
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* Token must start with [APPLICATION 0] SEQUENCE.
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* But if it doesn't assume it is DCE-STYLE Kerberos!
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*/
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if (len == 0)
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return (GSS_S_DEFECTIVE_TOKEN);
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p++;
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len--;
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/*
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* Decode the length and make sure it agrees with the
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* token length.
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*/
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if (len == 0)
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return (GSS_S_DEFECTIVE_TOKEN);
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if ((*p & 0x80) == 0) {
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a = *p;
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p++;
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len--;
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} else {
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b = *p & 0x7f;
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p++;
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len--;
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if (len < b)
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return (GSS_S_DEFECTIVE_TOKEN);
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a = 0;
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while (b) {
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a = (a << 8) | *p;
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p++;
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len--;
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b--;
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}
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}
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if (a != len)
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return (GSS_S_DEFECTIVE_TOKEN);
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/*
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* Decode the OID for the mechanism. Simplify life by
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* assuming that the OID length is less than 128 bytes.
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*/
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if (len < 2 || *p != 0x06)
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return (GSS_S_DEFECTIVE_TOKEN);
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if ((p[1] & 0x80) || p[1] > (len - 2))
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return (GSS_S_DEFECTIVE_TOKEN);
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mech_oid->length = p[1];
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p += 2;
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len -= 2;
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mech_oid->elements = p;
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return (GSS_S_COMPLETE);
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}
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static gss_OID_desc krb5_mechanism =
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{9, (void *)(uintptr_t) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
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static gss_OID_desc ntlm_mechanism =
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{10, (void *)(uintptr_t) "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a"};
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static gss_OID_desc spnego_mechanism =
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{6, (void *)(uintptr_t) "\x2b\x06\x01\x05\x05\x02"};
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static OM_uint32
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choose_mech(const gss_buffer_t input, gss_OID mech_oid)
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{
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OM_uint32 status;
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/*
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* First try to parse the gssapi token header and see if it's a
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* correct header, use that in the first hand.
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*/
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status = parse_header(input, mech_oid);
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if (status == GSS_S_COMPLETE)
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return (GSS_S_COMPLETE);
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/*
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* Lets guess what mech is really is, callback function to mech ??
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*/
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if (input->length > 8 &&
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memcmp((const char *)input->value, "NTLMSSP\x00", 8) == 0)
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{
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*mech_oid = ntlm_mechanism;
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return (GSS_S_COMPLETE);
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} else if (input->length != 0 &&
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((const char *)input->value)[0] == 0x6E)
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{
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/* Could be a raw AP-REQ (check for APPLICATION tag) */
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*mech_oid = krb5_mechanism;
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return (GSS_S_COMPLETE);
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} else if (input->length == 0) {
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/*
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* There is the a weird mode of SPNEGO (in CIFS and
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* SASL GSS-SPENGO where the first token is zero
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* length and the acceptor returns a mech_list, lets
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* hope that is what is happening now.
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*/
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*mech_oid = spnego_mechanism;
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return (GSS_S_COMPLETE);
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}
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return (status);
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}
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OM_uint32 gss_accept_sec_context(OM_uint32 *minor_status,
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gss_ctx_id_t *context_handle,
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const gss_cred_id_t acceptor_cred_handle,
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const gss_buffer_t input_token,
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const gss_channel_bindings_t input_chan_bindings,
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gss_name_t *src_name,
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gss_OID *mech_type,
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gss_buffer_t output_token,
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OM_uint32 *ret_flags,
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OM_uint32 *time_rec,
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gss_cred_id_t *delegated_cred_handle)
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{
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OM_uint32 major_status, mech_ret_flags;
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struct _gss_mech_switch *m;
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struct _gss_context *ctx = (struct _gss_context *) *context_handle;
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struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle;
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struct _gss_mechanism_cred *mc;
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gss_cred_id_t acceptor_mc, delegated_mc;
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gss_name_t src_mn;
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*minor_status = 0;
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if (src_name)
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*src_name = GSS_C_NO_NAME;
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if (mech_type)
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*mech_type = GSS_C_NO_OID;
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if (ret_flags)
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*ret_flags = 0;
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if (time_rec)
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*time_rec = 0;
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if (delegated_cred_handle)
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*delegated_cred_handle = GSS_C_NO_CREDENTIAL;
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_gss_buffer_zero(output_token);
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/*
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* If this is the first call (*context_handle is NULL), we must
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* parse the input token to figure out the mechanism to use.
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*/
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if (*context_handle == GSS_C_NO_CONTEXT) {
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gss_OID_desc mech_oid;
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major_status = choose_mech(input_token, &mech_oid);
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if (major_status != GSS_S_COMPLETE)
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return (major_status);
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/*
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* Now that we have a mechanism, we can find the
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* implementation.
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*/
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ctx = malloc(sizeof(struct _gss_context));
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if (!ctx) {
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*minor_status = ENOMEM;
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return (GSS_S_DEFECTIVE_TOKEN);
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}
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memset(ctx, 0, sizeof(struct _gss_context));
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m = ctx->gc_mech = _gss_find_mech_switch(&mech_oid);
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if (!m) {
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free(ctx);
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return (GSS_S_BAD_MECH);
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}
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} else
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m = ctx->gc_mech;
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if (cred) {
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SLIST_FOREACH(mc, &cred->gc_mc, gmc_link)
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if (mc->gmc_mech == m)
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break;
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if (!mc)
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return (GSS_S_BAD_MECH);
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acceptor_mc = mc->gmc_cred;
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} else {
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acceptor_mc = GSS_C_NO_CREDENTIAL;
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}
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delegated_mc = GSS_C_NO_CREDENTIAL;
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mech_ret_flags = 0;
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major_status = m->gm_accept_sec_context(minor_status,
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&ctx->gc_ctx,
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acceptor_mc,
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input_token,
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input_chan_bindings,
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&src_mn,
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mech_type,
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output_token,
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&mech_ret_flags,
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time_rec,
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&delegated_mc);
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if (major_status != GSS_S_COMPLETE &&
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major_status != GSS_S_CONTINUE_NEEDED) {
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_gss_mg_error(m, major_status, *minor_status);
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return (major_status);
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}
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if (src_name && src_mn) {
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/*
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* Make a new name and mark it as an MN.
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*/
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struct _gss_name *name = _gss_make_name(m, src_mn);
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if (!name) {
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m->gm_release_name(minor_status, &src_mn);
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return (GSS_S_FAILURE);
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}
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*src_name = (gss_name_t) name;
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} else if (src_mn) {
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m->gm_release_name(minor_status, &src_mn);
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}
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if (delegated_mc == GSS_C_NO_CREDENTIAL)
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mech_ret_flags &= ~GSS_C_DELEG_FLAG;
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if (mech_ret_flags & GSS_C_DELEG_FLAG) {
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if (!delegated_cred_handle) {
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m->gm_release_cred(minor_status, &delegated_mc);
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mech_ret_flags &= ~GSS_C_DELEG_FLAG;
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} else {
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struct _gss_cred *dcred;
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struct _gss_mechanism_cred *dmc;
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dcred = malloc(sizeof(struct _gss_cred));
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if (!dcred) {
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*minor_status = ENOMEM;
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return (GSS_S_FAILURE);
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}
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SLIST_INIT(&dcred->gc_mc);
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dmc = malloc(sizeof(struct _gss_mechanism_cred));
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if (!dmc) {
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free(dcred);
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*minor_status = ENOMEM;
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return (GSS_S_FAILURE);
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}
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dmc->gmc_mech = m;
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dmc->gmc_mech_oid = &m->gm_mech_oid;
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dmc->gmc_cred = delegated_mc;
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SLIST_INSERT_HEAD(&dcred->gc_mc, dmc, gmc_link);
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*delegated_cred_handle = (gss_cred_id_t) dcred;
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}
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}
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if (ret_flags)
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*ret_flags = mech_ret_flags;
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*context_handle = (gss_ctx_id_t) ctx;
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return (major_status);
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}
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