Mercurial > dropbear
annotate libtomcrypt/src/modes/ecb/ecb_done.c @ 1790:42745af83b7d
Introduce extra delay before closing unauthenticated sessions
To make it harder for attackers, introduce a delay to keep an
unauthenticated session open a bit longer, thus blocking a connection
slot until after the delay.
Without this, while there is a limit on the amount of attempts an attacker
can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to
handle one attempt is still short and thus for each of the allowed parallel
attempts many attempts can be chained one after the other. The attempt rate
is then:
"MAX_UNAUTH_PER_IP / <process time of one attempt>".
With the delay, this rate becomes:
"MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author | Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> |
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date | Wed, 15 Feb 2017 13:53:04 +0100 |
parents | 6dba84798cd5 |
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rev | line source |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file ecb_done.c |
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13 ECB implementation, finish chain, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_ECB_MODE |
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17 |
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18 /** Terminate the chain |
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19 @param ecb The ECB chain to terminate |
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20 @return CRYPT_OK on success |
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21 */ |
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22 int ecb_done(symmetric_ECB *ecb) |
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23 { |
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24 int err; |
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25 LTC_ARGCHK(ecb != NULL); |
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26 |
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27 if ((err = cipher_is_valid(ecb->cipher)) != CRYPT_OK) { |
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28 return err; |
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29 } |
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30 cipher_descriptor[ecb->cipher].done(&ecb->key); |
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31 return CRYPT_OK; |
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32 } |
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33 |
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34 |
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35 |
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36 #endif |
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37 |
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38 /* ref: $Format:%D$ */ |
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39 /* git commit: $Format:%H$ */ |
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40 /* commit time: $Format:%ai$ */ |