4a7eb74374
Add support for SAnon, a simple key agreement protocol that provides no authentication of initiator or acceptor using x25519 ECDH key exchange. See doc/standardization/draft-howard-gss-sanon-xx.txt for a protocol description.
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/*
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* Copyright (c) 2019-2020, AuriStor, Inc.
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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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* - 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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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef SANON_LOCL_H
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#define SANON_LOCL_H 1
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#include <config.h>
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#include <krb5_locl.h> /* for _krb5_SP800_108_HMAC_KDF() */
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#include <hcrypto/x25519_ref10.h>
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#include <gssapi.h>
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#include <gkrb5_err.h> /* for GSS_KRB5_S_XXX */
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#include "mech/mech_locl.h"
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/* context is initiator context */
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#define SANON_FLAG_INITIATOR 0x0001
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/* RFC 4757 extended flags */
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#define SANON_FLAG_DCE_STYLE 0x1000
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#define SANON_FLAG_IDENTIFY 0x2000
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#define SANON_FLAG_EXTENDED_ERROR 0x4000
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typedef struct sanon_ctx_desc {
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/* X25519 ECDH secret key */
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uint8_t sk[crypto_scalarmult_curve25519_BYTES];
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/* X25519 ECDH public key */
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uint8_t pk[crypto_scalarmult_curve25519_BYTES];
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/* SANON_FLAG_xxx */
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uint32_t flags;
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/* krb5 context for message protection/PRF */
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gss_ctx_id_t rfc4121;
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} *sanon_ctx;
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extern gss_name_t _gss_sanon_anonymous_identity;
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extern gss_name_t _gss_sanon_non_anonymous_identity;
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extern gss_cred_id_t _gss_sanon_anonymous_cred;
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extern gss_cred_id_t _gss_sanon_non_anonymous_cred;
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#include "sanon-private.h"
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#define SANON_WELLKNOWN_USER_NAME "WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS"
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#define SANON_WELLKNOWN_USER_NAME_LEN (sizeof(SANON_WELLKNOWN_USER_NAME) - 1)
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extern gss_buffer_t _gss_sanon_wellknown_user_name;
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#define SANON_WELLKNOWN_SERVICE_NAME "WELLKNOWN@ANONYMOUS"
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#define SANON_WELLKNOWN_SERVICE_NAME_LEN (sizeof(SANON_WELLKNOWN_SERVICE_NAME) - 1)
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extern gss_buffer_t _gss_sanon_wellknown_service_name;
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static inline int
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buffer_equal_p(gss_const_buffer_t b1, gss_const_buffer_t b2)
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{
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return b1->length == b2->length &&
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memcmp(b1->value, b2->value, b2->length) == 0;
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}
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static inline OM_uint32
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sanon_to_rfc4757_flags(uint32_t flags)
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{
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OM_uint32 ret = 0;
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if (flags & SANON_FLAG_DCE_STYLE)
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ret |= GSS_C_DCE_STYLE;
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if (flags & SANON_FLAG_IDENTIFY)
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ret |= GSS_C_IDENTIFY_FLAG;
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if (flags & SANON_FLAG_EXTENDED_ERROR)
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ret |= GSS_C_EXTENDED_ERROR_FLAG;
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return ret;
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}
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static inline uint32_t
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rfc4757_to_sanon_flags(OM_uint32 flags)
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{
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uint32_t ret = 0;
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if (flags & GSS_C_DCE_STYLE)
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ret |= SANON_FLAG_DCE_STYLE;
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if (flags & GSS_C_IDENTIFY_FLAG)
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ret |= SANON_FLAG_IDENTIFY;
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if (flags & GSS_C_EXTENDED_ERROR_FLAG)
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ret |= SANON_FLAG_EXTENDED_ERROR;
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return ret;
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}
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#endif /* SANON_LOCL_H */
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