Mercurial > dropbear

annotate dbhelpers.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents e75dab5bec71
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1283
3017bc7d6238 move m_burn and function attributes to dbhelpers
Matt Johnston <matt@ucc.asn.au>
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1 #include "dbhelpers.h"
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2 #include "includes.h"
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3
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4 /* Erase data */
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5 void m_burn(void *data, unsigned int len) {
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6
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7 #if defined(HAVE_MEMSET_S)
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8 memset_s(data, len, 0x0, len);
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9 #elif defined(HAVE_EXPLICIT_BZERO)
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10 explicit_bzero(data, len);
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11 #else
1575
e75dab5bec71 some linting after fuzz merge (#60)
François Perrad <francois.perrad@gadz.org>
parents: 1568
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12 /* This must be volatile to avoid compiler optimisation */
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4b1a807a3188 Just use memset, it should'be be optimised out in a separate file
Matt Johnston <matt@ucc.asn.au>
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13 volatile void *p = data;
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e75dab5bec71 some linting after fuzz merge (#60)
François Perrad <francois.perrad@gadz.org>
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14 memset((void*)p, 0x0, len);
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15 #endif
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16 }
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