149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/**
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* @file OTPChecker.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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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 are met:
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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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* 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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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Object that checks OTPs agains known seeds.
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*/
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#ifndef BADVPN_SECURITY_OTPCHECKER_H
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#define BADVPN_SECURITY_OTPCHECKER_H
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#include <stdint.h>
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#include <misc/balign.h>
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#include <misc/debug.h>
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#include <misc/modadd.h>
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#include <security/OTPCalculator.h>
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#include <base/DebugObject.h>
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#include <threadwork/BThreadWork.h>
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struct OTPChecker_entry {
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otp_t otp;
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int avail;
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};
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struct OTPChecker_table {
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uint16_t id;
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struct OTPChecker_entry *entries;
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};
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/**
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* Handler called when OTP generation for a seed is finished and new OTPs
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* can be recognized.
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*
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* @param user as in {@link OTPChecker_Init}
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*/
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typedef void (*OTPChecker_handler) (void *user);
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/**
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* Object that checks OTPs agains known seeds.
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*/
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typedef struct {
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BThreadWorkDispatcher *twd;
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OTPChecker_handler handler;
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void *user;
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int num_otps;
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int cipher;
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int num_entries;
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int num_tables;
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int tables_used;
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int next_table;
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OTPCalculator calc;
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struct OTPChecker_table *tables;
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struct OTPChecker_entry *entries;
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int tw_have;
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BThreadWork tw;
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uint8_t tw_key[BENCRYPTION_MAX_KEY_SIZE];
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uint8_t tw_iv[BENCRYPTION_MAX_BLOCK_SIZE];
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DebugObject d_obj;
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} OTPChecker;
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/**
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* Initializes the checker.
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* {@link BSecurity_GlobalInitThreadSafe} must have been done if
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* {@link BThreadWorkDispatcher_UsingThreads}(twd) = 1.
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*
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* @param mc the object
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* @param num_otps number of OTPs to generate from a seed. Must be >0.
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* @param cipher encryption cipher for calculating the OTPs. Must be valid
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* according to {@link BEncryption_cipher_valid}.
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* @param num_tables number of tables to keep, each for one seed. Must be >0.
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* @param twd thread work dispatcher
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* @return 1 on success, 0 on failure
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*/
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int OTPChecker_Init (OTPChecker *mc, int num_otps, int cipher, int num_tables, BThreadWorkDispatcher *twd) WARN_UNUSED;
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/**
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* Frees the checker.
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*
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* @param mc the object
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*/
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void OTPChecker_Free (OTPChecker *mc);
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/**
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* Starts generating OTPs to recognize for a seed.
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* OTPs for this seed will not be recognized until the {@link OTPChecker_handler} handler is called.
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* If OTPs are still being generated for a previous seed, it will be forgotten.
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*
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* @param mc the object
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* @param seed_id seed identifier
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* @param key encryption key
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* @param iv initialization vector
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*/
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void OTPChecker_AddSeed (OTPChecker *mc, uint16_t seed_id, uint8_t *key, uint8_t *iv);
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/**
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* Removes all active seeds.
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*
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* @param mc the object
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*/
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void OTPChecker_RemoveSeeds (OTPChecker *mc);
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/**
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* Checks an OTP.
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*
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* @param mc the object
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* @param seed_id identifer of seed whom the OTP is claimed to belong to
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* @param otp OTP to check
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* @return 1 if the OTP is valid, 0 if not
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*/
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int OTPChecker_CheckOTP (OTPChecker *mc, uint16_t seed_id, otp_t otp);
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/**
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* Sets handlers.
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*
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* @param mc the object
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* @param handler handler to call when generation of new OTPs is complete,
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* after {@link OTPChecker_AddSeed} was called.
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* @param user argument to handler
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*/
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void OTPChecker_SetHandlers (OTPChecker *mc, OTPChecker_handler handler, void *user);
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#endif
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