7439820618
We must switch to OpenSSL 3.x, and getting lib/hcrypto to provide OpenSSL 3.x APIs is too large an undertaking. Plus the hcrypto backend is not safe, not secure (probably has timing leaks galore), and no one has the resources to make it a world-class crypto library, so it just has to go.
255 lines
7.5 KiB
C
255 lines
7.5 KiB
C
/*
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* Copyright (c) 2021, PADL Software Pty Ltd.
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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 PADL Software 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 PADL SOFTWARE 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 PADL SOFTWARE 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 <krb5_locl.h>
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#include <mech_locl.h>
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#include "gss-preauth-protos.h"
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#include "gss-preauth-private.h"
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krb5_error_code
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_krb5_gss_map_error(OM_uint32 major, OM_uint32 minor)
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{
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krb5_error_code ret;
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if (minor != 0)
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return (krb5_error_code)minor;
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switch (major) {
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case GSS_S_COMPLETE:
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ret = 0;
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break;
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case GSS_S_CONTINUE_NEEDED:
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ret = HEIM_ERR_PA_CONTINUE_NEEDED;
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break;
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case GSS_S_BAD_NAME:
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case GSS_S_BAD_NAMETYPE:
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ret = KRB5_PRINC_NOMATCH;
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break;
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case GSS_S_NO_CRED:
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ret = KRB5_CC_NOTFOUND;
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break;
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case GSS_S_BAD_MIC:
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case GSS_S_DEFECTIVE_CREDENTIAL:
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ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
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break;
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case GSS_S_FAILURE:
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default:
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ret = KRB5KDC_ERR_PREAUTH_FAILED;
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break;
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}
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return ret;
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}
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krb5_error_code
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_krb5_gss_pa_derive_key(krb5_context context,
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gss_ctx_id_t ctx,
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krb5int32 nonce,
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krb5_enctype enctype,
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krb5_keyblock **keyblock)
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{
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krb5_error_code ret;
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u_char saltdata[12] = "KRB-GSS";
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krb5_keyblock kdkey;
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size_t keysize;
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OM_uint32 major, minor;
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gss_buffer_desc salt, dkey = GSS_C_EMPTY_BUFFER;
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*keyblock = NULL;
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ret = krb5_enctype_keysize(context, enctype, &keysize);
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if (ret)
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return ret;
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saltdata[ 8] = (nonce >> 0 ) & 0xFF;
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saltdata[ 9] = (nonce >> 8 ) & 0xFF;
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saltdata[10] = (nonce >> 16) & 0xFF;
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saltdata[11] = (nonce >> 24) & 0xFF;
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salt.value = saltdata;
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salt.length = sizeof(saltdata);
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major = gss_pseudo_random(&minor, ctx, GSS_C_PRF_KEY_FULL,
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&salt, keysize, &dkey);
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if (GSS_ERROR(major))
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return KRB5_PREAUTH_NO_KEY;
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kdkey.keytype = enctype;
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kdkey.keyvalue.data = dkey.value;
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kdkey.keyvalue.length = dkey.length;
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ret = krb5_copy_keyblock(context, &kdkey, keyblock);
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if (dkey.value) {
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memset_s(dkey.value, dkey.length, 0, dkey.length);
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gss_release_buffer(&minor, &dkey);
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}
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return ret;
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}
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krb5_error_code
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_krb5_gss_pa_unparse_name(krb5_context context,
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krb5_const_principal principal,
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gss_name_t *namep)
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{
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krb5_error_code ret;
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char *name = NULL;
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OM_uint32 major, minor;
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gss_buffer_desc name_buf;
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*namep = GSS_C_NO_NAME;
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if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
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if (principal->name.name_string.len != 1)
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return EINVAL;
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name = principal->name.name_string.val[0];
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} else {
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ret = krb5_unparse_name(context, principal, &name);
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if (ret)
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return ret;
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}
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name_buf.length = strlen(name);
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name_buf.value = name;
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major = gss_import_name(&minor, &name_buf,
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GSS_KRB5_NT_PRINCIPAL_NAME, namep);
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if (major == GSS_S_BAD_NAMETYPE) {
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gss_OID name_type = GSS_C_NO_OID;
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int flags = 0;
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if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
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name_type = GSS_C_NT_USER_NAME;
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} else if (principal->name.name_type == KRB5_NT_PRINCIPAL) {
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flags = KRB5_PRINCIPAL_UNPARSE_SHORT;
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name_type = GSS_C_NT_USER_NAME;
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} else if ((principal->name.name_type == KRB5_NT_SRV_HST ||
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principal->name.name_type == KRB5_NT_SRV_INST) &&
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principal->name.name_string.len == 2) {
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flags = KRB5_PRINCIPAL_UNPARSE_NO_REALM;
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name_type = GSS_C_NT_HOSTBASED_SERVICE;
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}
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if (flags) {
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krb5_xfree(name);
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ret = krb5_unparse_name_flags(context, principal, flags, &name);
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if (ret)
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return ret;
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if (gss_oid_equal(name_type, GSS_C_NT_HOSTBASED_SERVICE)) {
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char *inst = strchr(name, '/');
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if (inst)
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*inst = '@';
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}
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name_buf.length = strlen(name);
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name_buf.value = name;
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}
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if (name_type)
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major = gss_import_name(&minor, &name_buf, name_type, namep);
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}
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if (name != principal->name.name_string.val[0])
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krb5_xfree(name);
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return _krb5_gss_map_error(major, minor);
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}
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krb5_error_code
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_krb5_gss_pa_parse_name(krb5_context context,
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gss_const_name_t name,
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int flags,
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krb5_principal *principal)
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{
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krb5_error_code ret;
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char *displayed_name0;
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OM_uint32 major, minor;
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gss_OID name_type = GSS_C_NO_OID;
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gss_buffer_desc displayed_name = GSS_C_EMPTY_BUFFER;
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major = gss_display_name(&minor, name, &displayed_name, &name_type);
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if (GSS_ERROR(major))
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return _krb5_gss_map_error(major, minor);
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if (gss_oid_equal(name_type, GSS_C_NT_ANONYMOUS)) {
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ret = krb5_make_principal(context, principal, KRB5_ANON_REALM,
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KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME, NULL);
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if (ret == 0)
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(*principal)->name.name_type = KRB5_NT_WELLKNOWN;
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} else {
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displayed_name0 = malloc(displayed_name.length + 1);
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if (displayed_name0 == NULL)
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return krb5_enomem(context);
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memcpy(displayed_name0, displayed_name.value, displayed_name.length);
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displayed_name0[displayed_name.length] = '\0';
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ret = krb5_parse_name_flags(context, displayed_name0, flags, principal);
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gss_release_buffer(&minor, &displayed_name);
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free(displayed_name0);
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}
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gss_release_buffer(&minor, &displayed_name);
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return ret;
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}
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void
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_krb5_gss_data_to_buffer(const krb5_data *data, gss_buffer_t buffer)
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{
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if (data) {
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buffer->length = data->length;
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buffer->value = data->data;
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} else {
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_mg_buffer_zero(buffer);
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}
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}
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void
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_krb5_gss_buffer_to_data(gss_const_buffer_t buffer, krb5_data *data)
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{
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if (buffer) {
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data->length = buffer->length;
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data->data = buffer->value;
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} else {
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krb5_data_zero(data);
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}
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}
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