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/* * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include "../ssl_locl.h" #include "record_locl.h" /* mod 128 saturating subtract of two 64-bit values in big-endian order */ static int satsub64be(const unsigned char *v1, const unsigned char *v2) { int64_t ret; uint64_t l1, l2; n2l8(v1, l1); n2l8(v2, l2); ret = l1 - l2; /* We do not permit wrap-around */ if (l1 > l2 && ret < 0) return 128; else if (l2 > l1 && ret > 0) return -128; if (ret > 128) return 128; else if (ret < -128) return -128; else return (int)ret; } int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap) { int cmp; unsigned int shift; const unsigned char *seq = s->rlayer.read_sequence; cmp = satsub64be(seq, bitmap->max_seq_num); if (cmp > 0) { SSL3_RECORD_set_seq_num(RECORD_LAYER_get_rrec(&s->rlayer), seq); return 1; /* this record in new */ } shift = -cmp; if (shift >= sizeof(bitmap->map) * 8) return 0; /* stale, outside the window */ else if (bitmap->map & (1UL << shift)) return 0; /* record previously received */ SSL3_RECORD_set_seq_num(RECORD_LAYER_get_rrec(&s->rlayer), seq); return 1; } void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) { int cmp; unsigned int shift; const unsigned char *seq = RECORD_LAYER_get_read_sequence(&s->rlayer); cmp = satsub64be(seq, bitmap->max_seq_num); if (cmp > 0) { shift = cmp; if (shift < sizeof(bitmap->map) * 8) bitmap->map <<= shift, bitmap->map |= 1UL; else bitmap->map = 1UL; memcpy(bitmap->max_seq_num, seq, SEQ_NUM_SIZE); } else { shift = -cmp; if (shift < sizeof(bitmap->map) * 8) bitmap->map |= 1UL << shift; } }