4fb6a6adc9
An implementation of draft-zhu-negoex-04 for MIT Kerberos was developed in 2011. This has been recently integrated, with many fixes from Greg Hudson. This commit ports it to Heimdal. The implementation has been interoperability tested with MIT Kerberos and Windows, using the GSS EAP mechanism developed as part of the Moonshot project. The SPNEGO code was also updated to import the state machine from Apple which improves mechListMIC processing and avoids discarding initial context tokens generated during mechanism probing, that can be used for optimistic tokens. Finally, to aid in testing, the GSS-API mechanism glue configuration file can be changed using the environment variable GSS_MECH_CONFIG. This environment variable name, along with the format of the configuration file, is compatible with MIT (although it would be difficult for a single mechanism binary to support both implementations).
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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* Copyright (C) 2011-2019 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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* * 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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#ifndef NEGOEX_LOCL_H
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#define NEGOEX_LOCL_H
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#include <negoex_err.h>
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struct gssspnego_ctx_desc;
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#define MESSAGE_SIGNATURE 0x535458454F47454EULL
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#define EXTENSION_LENGTH 12
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#define EXTENSION_FLAG_CRITICAL 0x80000000
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#define CHECKSUM_SCHEME_RFC3961 1
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#define NEGOEX_KEYUSAGE_INITIATOR_CHECKSUM 23
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#define NEGOEX_KEYUSAGE_ACCEPTOR_CHECKSUM 25
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#define CHECKSUM_HEADER_LENGTH 20
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#define GUID_LENGTH 16
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typedef uint8_t auth_scheme[GUID_LENGTH];
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typedef uint8_t conversation_id[GUID_LENGTH];
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#define GUID_EQ(a, b) (memcmp(a, b, GUID_LENGTH) == 0)
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#define NEGO_MESSAGE_HEADER_LENGTH 96
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#define EXCHANGE_MESSAGE_HEADER_LENGTH 64
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#define VERIFY_MESSAGE_HEADER_LENGTH 80
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#define ALERT_MESSAGE_HEADER_LENGTH 72
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#define ALERT_LENGTH 12
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#define ALERT_PULSE_LENGTH 8
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#define ALERT_TYPE_PULSE 1
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#define ALERT_VERIFY_NO_KEY 1
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enum message_type {
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INITIATOR_NEGO = 0, /* NEGO_MESSAGE */
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ACCEPTOR_NEGO, /* NEGO_MESSAGE */
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INITIATOR_META_DATA, /* EXCHANGE_MESSAGE */
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ACCEPTOR_META_DATA, /* EXCHANGE_MESSAGE */
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CHALLENGE, /* EXCHANGE_MESSAGE */
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AP_REQUEST, /* EXCHANGE_MESSAGE */
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VERIFY, /* VERIFY_MESSAGE */
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ALERT, /* ALERT */
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};
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struct nego_message {
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uint8_t random[32];
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const uint8_t *schemes;
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uint16_t nschemes;
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};
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struct exchange_message {
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auth_scheme scheme;
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gss_buffer_desc token;
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};
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struct verify_message {
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auth_scheme scheme;
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uint32_t cksum_type;
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const uint8_t *cksum;
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size_t cksum_len;
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size_t offset_in_token;
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};
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struct alert_message {
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auth_scheme scheme;
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int verify_no_key;
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};
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struct negoex_message {
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uint32_t type;
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union {
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struct nego_message n;
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struct exchange_message e;
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struct verify_message v;
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struct alert_message a;
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} u;
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};
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struct negoex_auth_mech {
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HEIM_TAILQ_ENTRY(negoex_auth_mech) links;
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gss_OID oid;
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auth_scheme scheme;
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gss_ctx_id_t mech_context;
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gss_buffer_desc metadata;
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krb5_crypto crypto;
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krb5_crypto verify_crypto;
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int complete;
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int sent_checksum;
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int verified_checksum;
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};
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#define NEGOEX_LOG_LEVEL 10
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#endif /* NEGOEX_LOCL_H */
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