92c288994a
If an initial security context token doesn't have a standard header per RFC2743 then try all mechanisms until one succeeds or all fail. We still try to guess NTLMSSP, raw Kerberos, and SPNEGO, from tasting the initial security context token.
255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
/*
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* Copyright (c) 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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*
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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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*
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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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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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#include "ntlm.h"
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/*
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*
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*/
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OM_uint32
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_gss_ntlm_allocate_ctx(OM_uint32 *minor_status, ntlm_ctx *ctx)
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{
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OM_uint32 maj_stat;
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struct ntlm_server_interface *ns_interface = NULL;
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#ifdef DIGEST
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ns_interface = &ntlmsspi_kdc_digest;
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#endif
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if (ns_interface == NULL)
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return GSS_S_FAILURE;
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*ctx = calloc(1, sizeof(**ctx));
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if (*ctx == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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(*ctx)->server = ns_interface;
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maj_stat = (*(*ctx)->server->nsi_init)(minor_status, &(*ctx)->ictx);
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if (maj_stat == GSS_S_COMPLETE)
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return GSS_S_COMPLETE;
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if (*ctx)
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free(*ctx);
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(*ctx) = NULL;
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return maj_stat;
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}
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/*
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*
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*/
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OM_uint32 GSSAPI_CALLCONV
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_gss_ntlm_accept_sec_context
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(OM_uint32 * minor_status,
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gss_ctx_id_t * context_handle,
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gss_const_cred_id_t acceptor_cred_handle,
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const gss_buffer_t input_token_buffer,
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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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{
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krb5_error_code ret;
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struct ntlm_buf data;
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OM_uint32 junk;
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ntlm_ctx ctx;
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output_token->value = NULL;
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output_token->length = 0;
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*minor_status = 0;
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if (context_handle == NULL)
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return GSS_S_FAILURE;
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if (input_token_buffer == GSS_C_NO_BUFFER)
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return GSS_S_FAILURE;
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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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if (*context_handle == GSS_C_NO_CONTEXT) {
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struct ntlm_type1 type1;
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OM_uint32 major_status;
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OM_uint32 retflags;
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struct ntlm_buf out;
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major_status = _gss_ntlm_allocate_ctx(minor_status, &ctx);
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if (major_status)
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return major_status;
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*context_handle = (gss_ctx_id_t)ctx;
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/* check if the mechs is allowed by remote service */
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major_status = (*ctx->server->nsi_probe)(minor_status, ctx->ictx, NULL);
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if (major_status) {
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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return major_status;
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}
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data.data = input_token_buffer->value;
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data.length = input_token_buffer->length;
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ret = heim_ntlm_decode_type1(&data, &type1);
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if (ret) {
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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*minor_status = ret;
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return GSS_S_DEFECTIVE_TOKEN;
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}
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if ((type1.flags & NTLM_NEG_UNICODE) == 0) {
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heim_ntlm_free_type1(&type1);
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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if (type1.flags & NTLM_NEG_SIGN)
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ctx->gssflags |= GSS_C_CONF_FLAG;
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if (type1.flags & NTLM_NEG_SIGN)
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ctx->gssflags |= GSS_C_INTEG_FLAG;
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major_status = (*ctx->server->nsi_type2)(minor_status,
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ctx->ictx,
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type1.flags,
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type1.hostname,
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type1.domain,
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&retflags,
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&out);
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heim_ntlm_free_type1(&type1);
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if (major_status != GSS_S_COMPLETE) {
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OM_uint32 gunk;
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_gss_ntlm_delete_sec_context(&gunk, context_handle, NULL);
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return major_status;
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}
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output_token->value = malloc(out.length);
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if (output_token->value == NULL && out.length != 0) {
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OM_uint32 gunk;
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_gss_ntlm_delete_sec_context(&gunk, context_handle, NULL);
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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memcpy(output_token->value, out.data, out.length);
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output_token->length = out.length;
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ctx->flags = retflags;
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return GSS_S_CONTINUE_NEEDED;
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} else {
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OM_uint32 maj_stat;
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struct ntlm_type3 type3;
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struct ntlm_buf session;
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ctx = (ntlm_ctx)*context_handle;
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data.data = input_token_buffer->value;
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data.length = input_token_buffer->length;
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ret = heim_ntlm_decode_type3(&data, 1, &type3);
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if (ret) {
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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*minor_status = ret;
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return GSS_S_DEFECTIVE_TOKEN;
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}
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maj_stat = (*ctx->server->nsi_type3)(minor_status,
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ctx->ictx,
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&type3,
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&session);
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if (maj_stat) {
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heim_ntlm_free_type3(&type3);
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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return maj_stat;
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}
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if (src_name) {
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ntlm_name n = calloc(1, sizeof(*n));
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if (n) {
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n->user = strdup(type3.username);
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n->domain = strdup(type3.targetname);
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}
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if (n == NULL || n->user == NULL || n->domain == NULL) {
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gss_name_t tempn = (gss_name_t)n;
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_gss_ntlm_release_name(&junk, &tempn);
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heim_ntlm_free_type3(&type3);
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_gss_ntlm_delete_sec_context(minor_status,
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context_handle, NULL);
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return maj_stat;
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}
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*src_name = (gss_name_t)n;
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}
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heim_ntlm_free_type3(&type3);
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ret = krb5_data_copy(&ctx->sessionkey,
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session.data, session.length);
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if (ret) {
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if (src_name)
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_gss_ntlm_release_name(&junk, src_name);
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_gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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_gss_ntlm_set_keys(ctx);
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if (mech_type)
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*mech_type = GSS_NTLM_MECHANISM;
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if (time_rec)
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*time_rec = GSS_C_INDEFINITE;
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ctx->status |= STATUS_OPEN;
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if (ret_flags)
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*ret_flags = ctx->gssflags;
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return GSS_S_COMPLETE;
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}
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}
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