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Reply to topic   Topic: Building httpd with ldap and ssl and using mod_authnz_ldap

Joined: 30 Jul 2020
Posts: 8

PostPosted: Thu 30 Jul '20 19:41    Post subject: Building httpd with ldap and ssl and using mod_authnz_ldap Reply with quote


System info:
cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.4 (Santiago)

uname -a
Linux lb-cam-bca-13 2.6.32-642.15.1.el6.x86_64 #1 SMP Fri Feb 24 14:31:22 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

httpd -version
Server version: Apache/2.4.25 (Unix)
Server built: Jun 27 2017 16:23:25

gcc --version
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-17)


I have installed a local version of apache 2.4 on my rhel 6 machine and is currently up and running fine.

However I now wish to enable ldap support on it and so initially tried to configure using the following:
./configure --prefix=/lb-cam-bca-13/usr/local/apache --with-included-apr --enable-ldap --enable-authnz-ldap --enable-ssl --enable-so --with-ldap

which seems to configure ok, but when I try to build I get the following errors:
gcc -std=gnu99 -g -O2 -pthread -DLINUX -D_REENTRANT -D_GNU_SOURCE -I. -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/os/unix -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/include -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/srclib/apr/include -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/srclib/apr-util/include -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/aaa -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/cache -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/core -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/database -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/filters -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/ldap -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/loggers -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/lua -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/proxy -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/session -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/ssl -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/test -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/server -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/arch/unix -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/dav/main -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/generators -I/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/modules/mappers -c /lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/server/buildmark.c
/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/srclib/apr/libtool --silent --mode=link gcc -std=gnu99 -g -O2 -pthread -o httpd modules.lo buildmark.o -export-dynamic server/libmain.la modules/core/libmod_so.la modules/http/libmod_http.la server/mpm/event/libevent.la os/unix/libos.la -lpcre /lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/srclib/apr-util/libaprutil-1.la -lexpat /lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25/srclib/apr/libapr-1.la -lrt -lcrypt -lpthread
server/.libs/libmain.a(exports.o)Sad.data+0x2758): undefined reference to `apr_ldap_ssl_init'
server/.libs/libmain.a(exports.o)Sad.data+0x2760): undefined reference to `apr_ldap_ssl_deinit'
server/.libs/libmain.a(exports.o)Sad.data+0x2768): undefined reference to `apr_ldap_init'
server/.libs/libmain.a(exports.o)Sad.data+0x2770): undefined reference to `apr_ldap_info'
server/.libs/libmain.a(exports.o)Sad.data+0x2778): undefined reference to `apr_ldap_get_option'
server/.libs/libmain.a(exports.o)Sad.data+0x2780): undefined reference to `apr_ldap_set_option'
server/.libs/libmain.a(exports.o)Sad.data+0x2788): undefined reference to `apr_ldap_rebind_init'
server/.libs/libmain.a(exports.o)Sad.data+0x2790): undefined reference to `apr_ldap_rebind_add'
server/.libs/libmain.a(exports.o)Sad.data+0x2798): undefined reference to `apr_ldap_rebind_remove'
server/.libs/libmain.a(exports.o)Sad.data+0x27a0): undefined reference to `apr_ldap_is_ldap_url'
server/.libs/libmain.a(exports.o)Sad.data+0x27a8): undefined reference to `apr_ldap_is_ldaps_url'
server/.libs/libmain.a(exports.o)Sad.data+0x27b0): undefined reference to `apr_ldap_is_ldapi_url'
server/.libs/libmain.a(exports.o)Sad.data+0x27b8): undefined reference to `apr_ldap_url_parse_ext'
server/.libs/libmain.a(exports.o)Sad.data+0x27c0): undefined reference to `apr_ldap_url_parse'
collect2: ld returned 1 exit status
make[1]: *** [httpd] Error 1
make[1]: Leaving directory `/lb-cam-bca-13/usr/local/src/apache/httpd-2.4.25'
make: *** [all-recursive] Error 1

Anyone know whether I should be able to build httpd with ldap and ssl using the included apr ? And if so what runes I need to dos ?

Thinking that may be the included apr either does not support ldap or is in someway not comptible with my version of gcc thought I'd try building apr and apr-util from scratch and use --with directives to include then in the httpd build. This seemed to build ok, but when trying to run apache I get a link error.

I did the following:
download and unpack apr-1.7.0
download and unpack apr-util-1.6.1

# confgire apr-1.7.0 and build it
$ cd apr/apr-1.7.0
./configure --prefix=/lb-cam-bca-13/usr/local/apache
make install

# configure apr-util-1.6.1 and build it
$ ./configure --with-crypto --with-ldap=ldap --with-openssl --with-mysql --with-apr=../../apr/apr-1.7.0 --enable-so
make install

# configure and build httpd
$ ./configure --prefix=/lb-cam-bca-13/usr/local/apache --with-apr=../apr/apr-1.7.0 --with-apr-util=../aprutil/apr-util-1.6.1  --with-ldap --enable-authnz-ldap --enable-so --enable-ssl --enable-md --enable-log-forensic
make install

# enable load module in httpd.conf
LoadModule mod_authnz_ldap modules/mod_authnz_ldap.so

# ready to start apache
$ apachectl stop
# syntax error
httpd: Syntax error on line 74 of /lb-cam-bca-13/usr/local/apache/conf/httpd.conf: Can't locate API module structure `mod_authnz_ldap' in file /lb-cam-bca-13/usr/local/apache/modules/mod_authnz_ldap.so: /lb-cam-bca-13/usr/local/apache/modules/mod_authnz_ldap.so: undefined symbol: mod_authnz_ldap

Anyone any idea why this link error is occuring? Does anyone know even where the symbol should be got from - I cannot seem to find it in the binaries or (as a function) in the source files ?
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James Blond

Joined: 19 Jan 2006
Posts: 6892
Location: Germany, Next to Hamburg

PostPosted: Fri 31 Jul '20 11:15    Post subject: Reply with quote

I didn't compiled apache with ldap support so far before, but you need to set the path in the configure


--with-ldap-include=/opt/lib/openldap-2.4.45/include --with-ldap-lib=/opt/lib/openldap-2.4.45/lib --with-crypto --with-ldap --enable-authnz-ldap

and you script doesn't find openssl lib. You can set that using export for the compiler flags.


export LD_LIBRARY_PATH=~/apache24/httpd-2.4.43/srclib/apr:${LD_LIBRARY_PATH}
export LDFLAGS="-Wl,-rpath,/opt/openssl/lib"
./configure --prefix=/opt/apache2 --enable-pie ......
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Joined: 30 Jul 2020
Posts: 8

PostPosted: Wed 05 Aug '20 10:09    Post subject: Reply with quote

Thank you for the reply.

I tried building a local version of ldap and openssl then explicitly specifying locations for ldap lib and include. Again all built fine, but I am still seeing the error. For completeness below is whta I did:

# openssl
$ cd openssl-1.0.2o
./configure --prefix=/lb-cam-bca-13/usr/local/apache
make install

$ cd ldap/openldap-2.4.50
./configure --prefix=/lb-cam-bca-13/usr/local/ldap --with-tls=openssl
make depend
make install

# apr
$ cd apache/apr/apr-1.7.0
./configure --prefix=/lb-cam-bca-13/usr/local/apache
make install

$ cd apache/aprutil/apr-util-1.6.1
./configure --with-crypto --with-ldap=ldap --with-openssl=/lb-cam-bca-13/usr/local/src/openssl-1.0.2o --with-mysql --with-apr=../../apr/apr-1.7.0 --with-ldap-include=/lb-cam-bca-13/usr/local/src/ldap/openldap-2.4.50/include --with-ldap-lib=/lb-cam-bca-13/usr/local/ldap/lib
make install

# httpd
$ ./configure --prefix=/lb-cam-bca-13/usr/local/apache --with-openssl=/lb-cam-bca-13/usr/local/src/openssl-1.0.2o --with-apr=../apr/apr-1.7.0 --with-apr-util=../aprutil/apr-util-1.6.1 --with-ldap-include=/lb-cam-bca-13/usr/local/src/ldap/openldap-2.4.50/include --with-ldap-lib=/lb-cam-bca-13/usr/local/ldap/lib --enable-authnz-ldap --enable-so --enable-ssl --enable-md --enable-log-forensic
make install

I have noticed during my searches that the error I am seeing is the same as one that is seen when the .so modules do not exist, which may mean that apache is not looking for the modules where I think it should be.

Does anyone know how I can get apache to output exactly where it is looking for the modules ?

Does anyone know where I can explicitly tell it where to look for the modules ? (As I understood it this was defined by the ServerRoot directive, but I guess that may not be the case, or maybe I have somehow inadvertently overridden it in my config file).
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Joined: 30 Jul 2020
Posts: 8

PostPosted: Wed 05 Aug '20 11:12    Post subject: Reply with quote

OK - it seems I was using the wrong name in the LoadModule directive.

The LoadModule line that I put in:
LoadModule mod_authnz_ldap modules/mod_authnz_ldap.so

should be:
LoadModule authnz_ldap_module modules/mod_authnz_ldap.so

Then it works. Clearly it was looking for mod_authnz_ldap in some table somewhere and not finding it.

Using the correct name it seems to be loading (though I have not tried actually using it)
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Joined: 16 Oct 2007
Posts: 2250
Location: Sun Diego, USA

PostPosted: Wed 05 Aug '20 20:50    Post subject: Reply with quote

Just a side note, when in doubt you can find these inside the module source itself, just look for


and add _module at the end.
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