[openssl-users] How to respond to TLS heartbeat in openssl

[Keshava Krishna Bhat K]

Hi Jeff,

I checked in the git repo (tags/OpenSSL_1_0_2g), opnesslconf.h does not
have OPENSSL_NO_HEARTBEATS the above definition in 1.0.2g.
So I think its enabled.

Regards,
Keshava.

On Fri, Dec 22, 2017 at 12:20 PM, Jeffrey Walton <noloader at gmail.com> wrote:

> On Fri, Dec 22, 2017 at 1:32 AM, Keshava Krishna Bhat K
> <keshavkrishna88 at gmail.com> wrote:
> > Ok, I got to know that
> >  openssl version -a gives out the flags used while building openssl.
> > so the output of this was
> >
> > OpenSSL 1.0.2g  1 Mar 2016
> > built on: reproducible build, date unspecified
> > platform: debian-amd64
> > options:  bn(64,64) rc4(16x,int) des(idx,cisc,16,int) blowfish(idx)
> > compiler: cc -I. -I.. -I../include  -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS
> > -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -m64 -DL_ENDIAN -g -O2
> > -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time
> > -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro
> -Wa,--noexecstack
> > -Wall -DMD32_REG_T=int -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT
> > -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM
> > -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM
> > -DGHASH_ASM -DECP_NISTZ256_ASM
> > OPENSSLDIR: "/usr/lib/ssl"
> >
> > Since the putput above does not have OPENSSL_NO_HEARTBEATS, I assume
> > heartbeats are not disabled in the build.
> > So I am back to square one :( -> how do I make the server respond to a
> TLS
> > heartbeat request ? Do I have to read the packet and write it back ?
>
> You should also check <openssl/opensslconf.h> for OPENSSL_NO_HEARTBEATS.
>
> $ cd openssl
> $ grep -B 1 -A 1 HEART include/openssl/opensslconf.h
> #endif
> #ifndef OPENSSL_NO_HEARTBEATS
> # define OPENSSL_NO_HEARTBEATS
> #endif
>
> Jeff
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