639 lines
18 KiB
C
639 lines
18 KiB
C
/*
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* Copyright (c) 2010 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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* Portions Copyright (c) 2010 Apple Inc. All rights reserved.
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* Portions Copyright (c) 2010 PADL Software Pty Ltd. 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 "mech_locl.h"
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#include <crypto-headers.h>
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static int
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get_option_def(int def, gss_const_OID mech, gss_mo_desc *mo, gss_buffer_t value)
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{
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return def;
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}
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int
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_gss_mo_get_option_1(gss_const_OID mech, gss_mo_desc *mo, gss_buffer_t value)
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{
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return get_option_def(1, mech, mo, value);
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}
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int
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_gss_mo_get_option_0(gss_const_OID mech, gss_mo_desc *mo, gss_buffer_t value)
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{
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return get_option_def(0, mech, mo, value);
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}
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int
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_gss_mo_get_ctx_as_string(gss_const_OID mech, gss_mo_desc *mo, gss_buffer_t value)
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{
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if (value) {
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value->value = strdup((char *)mo->ctx);
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if (value->value == NULL)
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return GSS_S_FAILURE;
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value->length = strlen((char *)mo->ctx);
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}
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return GSS_S_COMPLETE;
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}
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GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL
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gss_mo_set(gss_const_OID mech, gss_const_OID option,
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int enable, gss_buffer_t value)
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{
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gssapi_mech_interface m;
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size_t n;
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if ((m = __gss_get_mechanism(mech)) == NULL)
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return GSS_S_BAD_MECH;
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for (n = 0; n < m->gm_mo_num; n++)
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if (gss_oid_equal(option, m->gm_mo[n].option) && m->gm_mo[n].set)
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return m->gm_mo[n].set(mech, &m->gm_mo[n], enable, value);
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return GSS_S_UNAVAILABLE;
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}
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GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL
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gss_mo_get(gss_const_OID mech, gss_const_OID option, gss_buffer_t value)
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{
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gssapi_mech_interface m;
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size_t n;
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_mg_buffer_zero(value);
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if ((m = __gss_get_mechanism(mech)) == NULL)
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return GSS_S_BAD_MECH;
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for (n = 0; n < m->gm_mo_num; n++)
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if (gss_oid_equal(option, m->gm_mo[n].option) && m->gm_mo[n].get)
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return m->gm_mo[n].get(mech, &m->gm_mo[n], value);
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return GSS_S_UNAVAILABLE;
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}
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static void
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add_all_mo(gssapi_mech_interface m, gss_OID_set *options, OM_uint32 mask)
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{
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OM_uint32 minor;
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size_t n;
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for (n = 0; n < m->gm_mo_num; n++)
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if ((m->gm_mo[n].flags & mask) == mask)
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gss_add_oid_set_member(&minor, m->gm_mo[n].option, options);
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}
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GSSAPI_LIB_FUNCTION void GSSAPI_LIB_CALL
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gss_mo_list(gss_const_OID mech, gss_OID_set *options)
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{
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gssapi_mech_interface m;
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OM_uint32 major, minor;
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if (options == NULL)
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return;
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*options = GSS_C_NO_OID_SET;
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if ((m = __gss_get_mechanism(mech)) == NULL)
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return;
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major = gss_create_empty_oid_set(&minor, options);
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if (major != GSS_S_COMPLETE)
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return;
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add_all_mo(m, options, 0);
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}
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GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
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gss_mo_name(gss_const_OID mech, gss_const_OID option, gss_buffer_t name)
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{
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gssapi_mech_interface m;
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size_t n;
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if (name == NULL)
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return GSS_S_BAD_NAME;
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if ((m = __gss_get_mechanism(mech)) == NULL)
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return GSS_S_BAD_MECH;
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for (n = 0; n < m->gm_mo_num; n++) {
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if (gss_oid_equal(option, m->gm_mo[n].option)) {
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/*
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* If there is no name, its because its a GSS_C_MA and
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* there is already a table for that.
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*/
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if (m->gm_mo[n].name) {
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name->value = strdup(m->gm_mo[n].name);
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if (name->value == NULL)
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return GSS_S_BAD_NAME;
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name->length = strlen(m->gm_mo[n].name);
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return GSS_S_COMPLETE;
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} else {
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OM_uint32 junk;
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return gss_display_mech_attr(&junk, option,
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NULL, name, NULL);
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}
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}
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}
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return GSS_S_BAD_NAME;
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}
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/*
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* Helper function to allow NULL name
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*/
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static OM_uint32
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mo_value(const gss_const_OID mech, gss_const_OID option, gss_buffer_t name)
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{
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if (name == NULL)
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return GSS_S_COMPLETE;
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return gss_mo_get(mech, option, name);
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}
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/* code derived from draft-ietf-cat-sasl-gssapi-01 */
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static char basis_32[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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static OM_uint32
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make_sasl_name(OM_uint32 *minor, const gss_OID mech, char sasl_name[16])
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{
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EVP_MD_CTX *ctx;
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char *p = sasl_name;
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u_char hdr[2], hash[20], *h = hash;
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if (mech->length > 127)
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return GSS_S_BAD_MECH;
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hdr[0] = 0x06;
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hdr[1] = mech->length;
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ctx = EVP_MD_CTX_create();
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EVP_DigestInit_ex(ctx, EVP_sha1(), NULL);
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EVP_DigestUpdate(ctx, hdr, 2);
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EVP_DigestUpdate(ctx, mech->elements, mech->length);
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EVP_DigestFinal_ex(ctx, hash, NULL);
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EVP_MD_CTX_destroy(ctx);
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memcpy(p, "GS2-", 4);
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p += 4;
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*p++ = basis_32[(h[0] >> 3)];
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*p++ = basis_32[((h[0] & 7) << 2) | (h[1] >> 6)];
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*p++ = basis_32[(h[1] & 0x3f) >> 1];
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*p++ = basis_32[((h[1] & 1) << 4) | (h[2] >> 4)];
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*p++ = basis_32[((h[2] & 0xf) << 1) | (h[3] >> 7)];
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*p++ = basis_32[(h[3] & 0x7f) >> 2];
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*p++ = basis_32[((h[3] & 3) << 3) | (h[4] >> 5)];
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*p++ = basis_32[(h[4] & 0x1f)];
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*p++ = basis_32[(h[5] >> 3)];
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*p++ = basis_32[((h[5] & 7) << 2) | (h[6] >> 6)];
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*p++ = basis_32[(h[6] & 0x3f) >> 1];
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*p = '\0';
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return GSS_S_COMPLETE;
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}
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/*
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* gss_inquire_saslname_for_mech() wrapper that uses MIT SPI
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*/
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static OM_uint32
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inquire_saslname_for_mech_compat(OM_uint32 *minor,
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const gss_OID desired_mech,
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gss_buffer_t sasl_mech_name,
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gss_buffer_t mech_name,
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gss_buffer_t mech_description)
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{
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struct gss_mech_compat_desc_struct *gmc;
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gssapi_mech_interface m;
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OM_uint32 major;
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m = __gss_get_mechanism(desired_mech);
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if (m == NULL)
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return GSS_S_BAD_MECH;
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gmc = m->gm_compat;
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if (gmc != NULL && gmc->gmc_inquire_saslname_for_mech != NULL) {
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major = gmc->gmc_inquire_saslname_for_mech(minor,
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desired_mech,
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sasl_mech_name,
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mech_name,
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mech_description);
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} else {
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major = GSS_S_UNAVAILABLE;
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}
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return major;
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}
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/**
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* Returns different protocol names and description of the mechanism.
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*
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* @param minor_status minor status code
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* @param desired_mech mech list query
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* @param sasl_mech_name SASL GS2 protocol name
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* @param mech_name gssapi protocol name
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* @param mech_description description of gssapi mech
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*
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* @return returns GSS_S_COMPLETE or a error code.
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*
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* @ingroup gssapi
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*/
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GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
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gss_inquire_saslname_for_mech(OM_uint32 *minor_status,
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const gss_OID desired_mech,
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gss_buffer_t sasl_mech_name,
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gss_buffer_t mech_name,
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gss_buffer_t mech_description)
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{
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OM_uint32 major;
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_mg_buffer_zero(sasl_mech_name);
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_mg_buffer_zero(mech_name);
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_mg_buffer_zero(mech_description);
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if (minor_status)
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*minor_status = 0;
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if (desired_mech == NULL)
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return GSS_S_BAD_MECH;
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major = mo_value(desired_mech, GSS_C_MA_SASL_MECH_NAME, sasl_mech_name);
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if (major == GSS_S_COMPLETE) {
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/* Native SPI */
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major = mo_value(desired_mech, GSS_C_MA_MECH_NAME, mech_name);
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if (GSS_ERROR(major))
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return major;
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major = mo_value(desired_mech, GSS_C_MA_MECH_DESCRIPTION, mech_description);
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if (GSS_ERROR(major))
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return major;
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}
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if (GSS_ERROR(major)) {
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/* API-as-SPI compatibility */
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major = inquire_saslname_for_mech_compat(minor_status,
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desired_mech,
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sasl_mech_name,
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mech_name,
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mech_description);
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}
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if (GSS_ERROR(major)) {
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/* Algorithmically dervied SASL mechanism name */
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char buf[16];
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gss_buffer_desc tmp = { sizeof(buf) - 1, buf };
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major = make_sasl_name(minor_status, desired_mech, buf);
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if (GSS_ERROR(major))
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return major;
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major = _gss_copy_buffer(minor_status, &tmp, sasl_mech_name);
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if (GSS_ERROR(major))
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return major;
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}
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return major;
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}
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/**
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* Find a mech for a sasl name
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*
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* @param minor_status minor status code
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* @param sasl_mech_name
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* @param mech_type
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*
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* @return returns GSS_S_COMPLETE or an error code.
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*/
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GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
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gss_inquire_mech_for_saslname(OM_uint32 *minor_status,
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const gss_buffer_t sasl_mech_name,
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gss_OID *mech_type)
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{
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struct _gss_mech_switch *m;
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gss_buffer_desc name;
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OM_uint32 major, junk;
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char buf[16];
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_gss_load_mech();
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*mech_type = NULL;
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HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link) {
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struct gss_mech_compat_desc_struct *gmc;
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/* Native SPI */
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major = mo_value(m->gm_mech_oid, GSS_C_MA_SASL_MECH_NAME, &name);
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if (major == GSS_S_COMPLETE &&
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name.length == sasl_mech_name->length &&
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memcmp(name.value, sasl_mech_name->value, name.length) == 0) {
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gss_release_buffer(&junk, &name);
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*mech_type = m->gm_mech_oid;
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return GSS_S_COMPLETE;
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}
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gss_release_buffer(&junk, &name);
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if (GSS_ERROR(major)) {
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/* API-as-SPI compatibility */
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gmc = m->gm_mech.gm_compat;
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if (gmc && gmc->gmc_inquire_mech_for_saslname) {
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major = gmc->gmc_inquire_mech_for_saslname(minor_status,
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sasl_mech_name,
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mech_type);
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if (major == GSS_S_COMPLETE)
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return GSS_S_COMPLETE;
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}
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}
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if (GSS_ERROR(major)) {
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/* Algorithmically dervied SASL mechanism name */
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if (sasl_mech_name->length == 16 &&
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make_sasl_name(minor_status, m->gm_mech_oid, buf) == GSS_S_COMPLETE &&
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memcmp(buf, sasl_mech_name->value, 16) == 0) {
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*mech_type = m->gm_mech_oid;
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return GSS_S_COMPLETE;
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}
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}
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}
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return GSS_S_BAD_MECH;
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}
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/*
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* Test mechanism against indicated attributes using both Heimdal and
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* MIT SPIs.
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*/
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static int
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test_mech_attrs(gssapi_mech_interface mi,
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gss_const_OID_set mech_attrs,
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gss_const_OID_set against_attrs,
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int except)
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{
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size_t n, m;
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int eq = 0;
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if (against_attrs == GSS_C_NO_OID_SET)
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return 1;
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for (n = 0; n < against_attrs->count; n++) {
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for (m = 0; m < mi->gm_mo_num; m++) {
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eq = gss_oid_equal(mi->gm_mo[m].option,
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&against_attrs->elements[n]);
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if (eq)
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break;
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}
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if (mech_attrs != GSS_C_NO_OID_SET) {
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for (m = 0; m < mech_attrs->count; m++) {
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eq = gss_oid_equal(&mech_attrs->elements[m],
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&against_attrs->elements[n]);
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if (eq)
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break;
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}
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}
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if (!eq ^ except)
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return 0;
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}
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return 1;
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}
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/**
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* Return set of mechanism that fullfill the criteria
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*
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* @param minor_status minor status code
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* @param desired_mech_attrs
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* @param except_mech_attrs
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* @param critical_mech_attrs
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* @param mechs returned mechs, free with gss_release_oid_set().
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*
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* @return returns GSS_S_COMPLETE or an error code.
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*/
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GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
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gss_indicate_mechs_by_attrs(OM_uint32 * minor_status,
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gss_const_OID_set desired_mech_attrs,
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gss_const_OID_set except_mech_attrs,
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gss_const_OID_set critical_mech_attrs,
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gss_OID_set *mechs)
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{
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struct _gss_mech_switch *ms;
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gss_OID_set mech_attrs = GSS_C_NO_OID_SET;
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gss_OID_set known_mech_attrs = GSS_C_NO_OID_SET;
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OM_uint32 major, tmp;
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major = gss_create_empty_oid_set(minor_status, mechs);
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if (GSS_ERROR(major))
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return major;
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_gss_load_mech();
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HEIM_TAILQ_FOREACH(ms, &_gss_mechs, gm_link) {
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gssapi_mech_interface mi = &ms->gm_mech;
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struct gss_mech_compat_desc_struct *gmc = mi->gm_compat;
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if (gmc && gmc->gmc_inquire_attrs_for_mech) {
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major = gmc->gmc_inquire_attrs_for_mech(minor_status,
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&mi->gm_mech_oid,
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&mech_attrs,
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&known_mech_attrs);
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if (GSS_ERROR(major))
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continue;
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}
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/*
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* Test mechanism supports all of desired_mech_attrs;
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* none of except_mech_attrs;
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* and knows of all critical_mech_attrs.
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*/
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if (test_mech_attrs(mi, mech_attrs, desired_mech_attrs, 0) &&
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test_mech_attrs(mi, mech_attrs, except_mech_attrs, 1) &&
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test_mech_attrs(mi, known_mech_attrs, critical_mech_attrs, 0)) {
|
|
major = gss_add_oid_set_member(minor_status, &mi->gm_mech_oid, mechs);
|
|
}
|
|
|
|
gss_release_oid_set(&tmp, &mech_attrs);
|
|
gss_release_oid_set(&tmp, &known_mech_attrs);
|
|
|
|
if (GSS_ERROR(major))
|
|
break;
|
|
}
|
|
|
|
if (major)
|
|
gss_release_oid_set(&tmp, mechs);
|
|
|
|
return major;
|
|
}
|
|
|
|
/**
|
|
* List support attributes for a mech and/or all mechanisms.
|
|
*
|
|
* @param minor_status minor status code
|
|
* @param mech given together with mech_attr will return the list of
|
|
* attributes for mechanism, can optionally be GSS_C_NO_OID.
|
|
* @param mech_attr see mech parameter, can optionally be NULL,
|
|
* release with gss_release_oid_set().
|
|
* @param known_mech_attrs all attributes for mechanisms supported,
|
|
* release with gss_release_oid_set().
|
|
*
|
|
* @ingroup gssapi
|
|
*/
|
|
|
|
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
|
|
gss_inquire_attrs_for_mech(OM_uint32 * minor_status,
|
|
gss_const_OID mech,
|
|
gss_OID_set *mech_attr,
|
|
gss_OID_set *known_mech_attrs)
|
|
{
|
|
OM_uint32 major, junk;
|
|
|
|
if (known_mech_attrs)
|
|
*known_mech_attrs = GSS_C_NO_OID_SET;
|
|
|
|
if (mech_attr && mech) {
|
|
gssapi_mech_interface m;
|
|
struct gss_mech_compat_desc_struct *gmc;
|
|
|
|
if ((m = __gss_get_mechanism(mech)) == NULL) {
|
|
*minor_status = 0;
|
|
return GSS_S_BAD_MECH;
|
|
}
|
|
|
|
gmc = m->gm_compat;
|
|
|
|
if (gmc && gmc->gmc_inquire_attrs_for_mech) {
|
|
major = gmc->gmc_inquire_attrs_for_mech(minor_status,
|
|
mech,
|
|
mech_attr,
|
|
known_mech_attrs);
|
|
} else {
|
|
major = gss_create_empty_oid_set(minor_status, mech_attr);
|
|
if (major == GSS_S_COMPLETE)
|
|
add_all_mo(m, mech_attr, GSS_MO_MA);
|
|
}
|
|
if (GSS_ERROR(major))
|
|
return major;
|
|
}
|
|
|
|
if (known_mech_attrs) {
|
|
struct _gss_mech_switch *m;
|
|
|
|
if (*known_mech_attrs == GSS_C_NO_OID_SET) {
|
|
major = gss_create_empty_oid_set(minor_status, known_mech_attrs);
|
|
if (GSS_ERROR(major)) {
|
|
if (mech_attr)
|
|
gss_release_oid_set(&junk, mech_attr);
|
|
return major;
|
|
}
|
|
}
|
|
|
|
_gss_load_mech();
|
|
|
|
HEIM_TAILQ_FOREACH(m, &_gss_mechs, gm_link)
|
|
add_all_mo(&m->gm_mech, known_mech_attrs, GSS_MO_MA);
|
|
}
|
|
|
|
|
|
return GSS_S_COMPLETE;
|
|
}
|
|
|
|
/**
|
|
* Return names and descriptions of mech attributes
|
|
*
|
|
* @param minor_status minor status code
|
|
* @param mech_attr
|
|
* @param name
|
|
* @param short_desc
|
|
* @param long_desc
|
|
*
|
|
* @return returns GSS_S_COMPLETE or an error code.
|
|
*/
|
|
|
|
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
|
|
gss_display_mech_attr(OM_uint32 * minor_status,
|
|
gss_const_OID mech_attr,
|
|
gss_buffer_t name,
|
|
gss_buffer_t short_desc,
|
|
gss_buffer_t long_desc)
|
|
{
|
|
struct _gss_oid_name_table *ma = NULL;
|
|
OM_uint32 major;
|
|
size_t n;
|
|
|
|
_mg_buffer_zero(name);
|
|
_mg_buffer_zero(short_desc);
|
|
_mg_buffer_zero(long_desc);
|
|
|
|
if (minor_status)
|
|
*minor_status = 0;
|
|
|
|
for (n = 0; ma == NULL && _gss_ont_ma[n].oid; n++)
|
|
if (gss_oid_equal(mech_attr, _gss_ont_ma[n].oid))
|
|
ma = &_gss_ont_ma[n];
|
|
|
|
if (ma == NULL)
|
|
return GSS_S_BAD_MECH_ATTR;
|
|
|
|
if (name) {
|
|
gss_buffer_desc bd;
|
|
bd.value = rk_UNCONST(ma->name);
|
|
bd.length = strlen(ma->name);
|
|
major = _gss_copy_buffer(minor_status, &bd, name);
|
|
if (major != GSS_S_COMPLETE)
|
|
return major;
|
|
}
|
|
|
|
if (short_desc) {
|
|
gss_buffer_desc bd;
|
|
bd.value = rk_UNCONST(ma->short_desc);
|
|
bd.length = strlen(ma->short_desc);
|
|
major = _gss_copy_buffer(minor_status, &bd, short_desc);
|
|
if (major != GSS_S_COMPLETE)
|
|
return major;
|
|
}
|
|
|
|
if (long_desc) {
|
|
gss_buffer_desc bd;
|
|
bd.value = rk_UNCONST(ma->long_desc);
|
|
bd.length = strlen(ma->long_desc);
|
|
major = _gss_copy_buffer(minor_status, &bd, long_desc);
|
|
if (major != GSS_S_COMPLETE)
|
|
return major;
|
|
}
|
|
|
|
return GSS_S_COMPLETE;
|
|
}
|