Re: Problem with Crypto - OpenSSL 1.1.0f - Linux 9.4 (stretch)

Dave,
Try adding --with-openssl=/usr in the call to configure on your raspberry pi. If you're brave you can also try 5.8pre3  from https://sourceforge.net/projects/net-snmp/files/net-snmp/5.8-pre-releases/

-- 
Thanks,
Keith (pantherse)

On Wed, May 2, 2018, at 7:04 PM, Dave C wrote:
> I'm trying to build net-snmp-5.7.3 on a raspbery pi running Raspbian 9.4
> stretch.
> 
> The default packages are OpenSSL 1.1.0f  25 May 2017, libssl-dev
> 1.1.0f-3+deb9u2.
> 
> I configure net-snmp like so,
> 
> ./configure --with-defaults --with-ldflags=-Bstatic --disable-embedded-perl
> --disable-perl-cc-checks --without-perl-modules
> 
> And get this config output..
> 
> > ---------------------------------------------------------
> >             Net-SNMP configuration summary:
> > ---------------------------------------------------------
> >   SNMP Versions Supported:    1 2c 3
> >   Building for:               linux
> >   Net-SNMP Version:           5.7.3
> >   Network transport support:  Callback Unix Alias TCP UDP IPv4Base
> > SocketBase TCPBase UDPIPv4Base UDPBase
> >   SNMPv3 Security Modules:     usm
> >   Agent MIB code:            default_modules =>  snmpv3mibs mibII ucd_snmp
> > notification notification-log-mib target agent_mibs agentx disman/event
> > disman/schedule utilities host
> >   MYSQL Trap Logging:         unavailable
> >   Embedded Perl support:      disabled
> >   SNMP Perl modules:          disabled
> >   SNMP Python modules:        disabled
> >   Crypto support from:        crypto        ///// internal ??
> >   Authentication support:     MD5 SHA1
> >   Encryption support:         DES AES
> >   Local DNSSEC validation:    disabled
> 
> 
> However make dies at this point.
> 
> /bin/bash ../libtool  --mode=compile gcc -I../include -I.
> >  -I../snmplib  -fno-strict-aliasing -g -O2 -Ulinux -Dlinux=linux  -c -o
> > keytools.lo keytools.c
> > libtool: compile:  gcc -I../include -I. -I../snmplib -fno-strict-aliasing
> > -g -O2 -Ulinux -Dlinux=linux -c keytools.c  -fPIC -DPIC -o .libs/keytools.o
> > keytools.c: In function 'generate_Ku':
> > keytools.c:155:25: error: dereferencing pointer to incomplete type
> > 'EVP_MD_CTX {aka struct evp_md_ctx_st}'
> >      ctx = malloc(sizeof(*ctx));
> >                          ^~~~
> > keytools.c:265:9: warning: implicit declaration of function
> > 'EVP_MD_CTX_cleanup' [-Wimplicit-function-declaration]
> >          EVP_MD_CTX_cleanup(ctx);
> >          ^~~~~~~~~~~~~~~~~~
> > Makefile:98: recipe for target 'keytools.lo' failed
> > make[1]: *** [keytools.lo] Error 1
> > make[1]: Leaving directory '/root/net-snmp-5.7.3/snmplib'
> > Makefile:656: recipe for target 'subdirs' failed
> > make: *** [subdirs] Error 1
> 
> 
> So the first question is what's wrong with the above ?
> 
> 
> I have an Ubuntu box where I build net-snmp fine with crypo, it runs
> OpenSSL 1.0.2g so I downgraded the Raspbery PI to 1.0.2o
> 
> apt-get remove openssl
> > apt-get remove libssl-dev
> > cd ~
> > wget https://www.openssl.org/source/openssl-1.0.2o.tar.gz
> > cd openssl...
> > ./config --prefix=/usr/local --openssldir=/usr/local/openssl shared
> > make
> > make install
> > ldconfig
> > ldd $(which openssl)
> >         linux-vdso.so.1 (0x7ee91000)
> >         /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f09000)
> >         libssl.so.1.0.0 => /usr/local/lib/libssl.so.1.0.0 (0x76ea4000)
> >         libcrypto.so.1.0.0 => /usr/local/lib/libcrypto.so.1.0.0
> > (0x76d17000)
> >         libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x76d04000)
> >         libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x76bc5000)
> >         /lib/ld-linux-armhf.so.3 (0x76f1f000)
> >
> 
> Everything seems fine but now the configuration summary shows only "Crypto
> support from: Internal"
> 
> I looked at the configure script to see how it tests for OpenSSL support
> and replicated that
> 
> #include <openssl/ssl.h>
> > char EVP_md5 ();
> > int main(int argc, char *argv[]) {
> >   return EVP_md5 ();
> >   ;
> >   return 0;
> > }
> 
> 
> When I build that I get the following error showing that the EVP_md5 is
> accessible and the crypto library is installed.
> 
> # gcc t.c -lcrypto
> > t.c:3:6: error: conflicting types for ‘EVP_md5’
> >  char EVP_md5 ();
> >       ^~~~~~~
> > In file included from /usr/local/include/openssl/x509.h:73:0,
> >                  from /usr/local/include/openssl/ssl.h:156,
> >                  from t.c:1:
> > /usr/local/include/openssl/evp.h:716:15: note: previous declaration of
> > ‘EVP_md5’ was here
> >  const EVP_MD *EVP_md5(void);
> >                ^~~~~~~
> 
> 
> 
> I'm not sure if that's the exact test that the configure script is doing
> but it's just not detecting
> 
> I hacked the configure script to force CRYPTO="crypto" but then compilation
> fails elsewhere so I assume I actually have installed OpenSSL incorrectly.
> 
> But ether-way I would prefer to fix the first problem above and link
> to  libssl-dev
> 1.1.0f
> 
> Thanks
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