--------------------------- strongSwan - Installation --------------------------- Contents -------- 1. Overview 2. Required packages 3. Optional packages 3.1 libcurl 3.2 OpenLDAP 3.3 PKCS#11 smartcard library modules 4. Kernel configuration 1. Overview -------- The strongSwan 4.x branch introduces a new build environment featuring GNU autotools. This should simplify the build process and package maintenance. First check for the availability of required packages on your system (section 2.). You may want to include support for additional features, which require other packages to be installed (section 3.). To compile an extracted tarball, run the ./configure script first: ./configure You may want to specify some arguments listed in section 3., or see the available options of the script using "./configure --help". After a successful run of the script, run make followed by make install in the usual manner. To check if your kernel fullfills the requirements, see section 4. Next add your connections to "/etc/ipsec.conf" and your secrets to "/etc/ipsec.secrets". Connections that are to be negotiated by the new IKEv2 charon keying daemon should be designated by "keyexchange=ikev2" and those by the IKEv1 pluto keying daemon either by "keyexchange=ikev1" or the default "keyexchange=ike". At last start strongSwan with ipsec start 2. Required packages ----------------- In order to be able to build strongSwan you'll need the GNU Multiprecision Arithmetic Library (GMP) available from http://www.swox.com/gmp/. At least version 4.1.5 of libgmp is required. The libgmp library and the corresponding header file gmp.h are usually included in the form of one or two packages in the major Linux distributions (SuSE: gmp; Debian unstable: libgmp3, libgmp3-dev). 3. Optional packages ----------------- 3.1 libcurl ------- If you intend to dynamically fetch Certificate Revocation Lists (CRLs) from an HTTP server or as an alternative want to use the Online Certificate Status Protocol (OCSP) then you will need the libcurl library available from http://curl.haxx.se/. In order to keep the library as compact as possible for use with strongSwan you can build libcurl from the sources with the optimized options ./configure --prefix= --without-ssl \ --disable-ldap --disable-telnet \ --disable-dict --disable-gopher \ --disable-debug \ --enable-nonblocking --enable-thread As an alternative you can use the ready-made packages included with your favorite Linux distribution (SuSE: curl, curl-devel). In order to activate the use of the libcurl library in strongSwan you must enable the ./configure switch: ./configure [...] --enable-http 3.2 OpenLDAP -------- If you intend to dynamically fetch Certificate Revocation Lists (CRLs) from an LDAP server then you will need the libldap library available from http://www.openldap.org/. OpenLDAP is usually included with your Linux distribution. You will need both the run-time and development environments (SuSE: openldap2, openldap2-devel). In order to activate the use of the libldap library in strongSwan you must enable the ./configure switch: ./configure [...] --enable-ldap LDAP Protocl version 2 is not supported anymore, --enable-ldap uses always version 3 of the LDAP protocol 3.3 PKCS#11 smartcard library modules --------------------------------- If you want to securely store your X.509 certificates and private RSA keys on a smart card or a USB crypto token then you will need a PKCS #11 library for the smart card of your choice. The OpenSC PKCS#11 library (use versions >= 0.9.4) available from http://www.opensc.org/ supports quite a selection of cards and tokens (e.g. Aladdin eToken Pro32k, Schlumberger Cryptoflex e-gate, Oberthur AuthentIC, etc.) but requires that a PKCS#15 directory structure be present on the smart card. But in principle any other PKCS#11 library could be used since the PKCS#11 API hides the internal data representation on the card. For USB crypto token support you must add the OpenCT driver library (version >= 0.6.2) from the OpenSC site, whereas for serial smartcard readers you'll need the pcsc-lite library and the matching driver from the M.U.S.C.L.E project http://www.linuxnet.com/ . In order to activate the PKCS#11-based smartcard support in strongSwan you must enable the smartcard ./configure switch: ./configure [...] --enable-smartcard During compilation no externel smart card libraries must be present. strongSwan directly references a copy of the standard RSAREF pkcs11.h header files stored in the pluto/rsaref sub directory. During compile time a pathname to a default PKCS#11 dynamical library can be specified with a ./configure flag: ./configure --enable-smartcard --with-default-pkcs11=/path/to/lib.so This default path to the easily-obtainable OpenSC library module can be simply overridden during run-time by specifying an alternative path in ipsec.conf pointing to any dynamic PKCS#11 library of your choice. config setup pkcs11module="/usr/lib/xyz-pkcs11.so" 4. Kernel configuration -------------------- The strongSwan 4.x series currently support only 2.6 kernels and its native IPsec stack. Please make sure that the following IPsec kernel modules are available: o af_key o ah4 o esp4 o ipcomp o xfrm_user o xfrm4_tunnel These may be built into the kernel or as modules. Modules get loaded automatically at strongSwan startup. Also the built-in kernel Cryptoapi modules with selected encryption and hash algorithms should be available.