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mod_fcgid expunges environment variables for the executed programs. There is FcgidInitialEnv directive to define an environment variable that will be passed to an executed program. However there seems to be a silent truncation of the variable value if it is longer then 127 characters.
Reproducer:
(1) httpd configuration:
FcgidInitialEnv XXX "/opt/app-root/src/bin:/opt/app-root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/app-root/src/extlib/bin"
<Location /psgi>
SetHandler fcgid-script
Options +ExecCGI
FcgidWrapper "/usr/local/bin/psgiwrapper" virtual
</Location>
(2) /usr/local/bin/psgiwrapper script dumps the environment to stderr:
#!/usr/bin/perl
use Data::Dumper;
warn Data::Dumper::Dumper(\%ENV);
(3) Retrieve the "/psgi" document:
$ wget -O /dev/null http://localhost/psgi
(4) Check httpd's error_log:
[Mon Nov 19 17:09:10.382047 2018] [core:notice] [pid 13607:tid 139764774131968] AH00094: Command line: 'httpd -D FOREGROUND'
$VAR1 = {
'XXX' => '/opt/app-root/src/bin:/opt/app-root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/app-root/src/extlib/b',
'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin'
};
[Mon Nov 19 17:09:14.892883 2018] [fcgid:warn] [pid 13612:tid 139764435437312] (104)Connection reset by peer: [client ::1:35680] mod_fcgid: error reading data from FastCGI server
[Mon Nov 19 17:09:14.892952 2018] [core:error] [pid 13612:tid 139764435437312] [client ::1:35680] End of script output before headers: psgi
Here you can see the XXX variable is missing last 2 characters. It's cut exactly at 128 bytes (including trailing zero).
This seems to be is caused by INITENV_VAL_LEN macro defined to 128 in fcgid_conf.h.
Please increase the length (256 bytes is fine for me). I need it for using mod_fcgid in perl s2i container image.
Affected package: mod_fcgid-2.3.9-12.el8.x86_64.