php - "libcrypto.so.1.0.0: version 'OPENSSL_1.0.1' not found " during shell_exec

Question

I'm running into a bit of a weird issue in PHP using shell_exec to run git commands. This is a brand new image of Ubuntu 16.x LTS with only a copy of Lampp installed and the git packages. Within a php script which I intend to webhook to, running shell_exec('/usr/bin/git pull 2>&1') prints out the following error.

ssh: /opt/lampp/lib/libcrypto.so.1.0.0: version 'OPENSSL_1.0.1' not found (required by ssh)
fatal: Could not read from remote repository.`

I can pull the repository using git pull from the command line and that the user running apache has ownership of all files in the htdocs directory.

openssl version -a results in the following:

OpenSSL 1.0.2g-fips  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"

Is this an issue with the Lamp 5.6.21, or is this an issue with my setup?

Answer 1

So you have XAMPP installed into /opt/lampp and trying to run native (as in coming from Ubuntu, not XAMPP) git via shell_exec(). What is the environment this shell runs in? It's the environment that XAMPP uses with LD_LIBRARY_PATH set /opt/lampp/lib, which is absolutely needed for all XAMPP components (because they're built to use these libraries from /opt/lampp/lib). Then git inherits this same environment and (although it has perfect openssl library from Ubuntu somewhere in /lib/x86_64-linux-gnu) tries to use libraries from /opt/lampp/lib, bang.

What you need is just to clear LD_LIBRARY_PATH environment variable prior to git invocation, like:

$oldldpath = getenv('LD_LIBRARY_PATH');
putenv("LD_LIBRARY_PATH=");
shell_exec('/usr/bin/git pull 2>&1');
putenv("LD_LIBRARY_PATH=$oldldpath");