User guide for the FIPS Red Hat Enterprise Linux - OpenSSL Module ================================================================= This package contains libraries which comprise the FIPS 140-2 Red Hat Enterprise Linux - OPENSSL Module. The module files ================ /lib/libcrypto.so.0.9.8e /lib/libssl.so.0.9.8e /lib/.libcrypto.so.0.9.8e.hmac /lib/.libssl.so.0.9.8e.hmac Dependencies ============ The approved mode of operation requires kernel with /dev/urandom RNG running with properties as defined in the security policy of the module. This is provided by kernel packages with validated Red Hat Enterprise Linux - IPSec Crytographic Module. Installation ============ The RPM package of the module can be installed by standard tools recommended for installation of RPM packages on the Red Hat Enterprise Linux system (yum, rpm, RHN remote management tool). For proper operation of the in-module integrity verification the prelink has to be disabled. This can be done with setting PRELINKING=no in the /etc/sysconfig/prelink configuration file. If the libraries were already prelinked the prelink should be undone on all the system files with the 'prelink -u -a' command. Usage and API ============= The module respects kernel command line FIPS setting. If the kernel command line contains option fips=1 the module will initialize in the FIPS approved mode of operation automatically. To allow for the automatic initialization the application using the module has to call one of the following API calls: - void OPENSSL_init(void) - this will do only a basic initialization of the library and does initialization of the FIPS approved mode without setting up EVP API with supported algorithms. - void OPENSSL_add_all_algorithms(void) - this API function calls OPENSSL_init() implicitly and also adds all approved algorithms to the EVP API in the approved mode - void SSL_library_init(void) - it calls OPENSSL_init() implicitly and also adds algorithms which are necessary for TLS protocol support and initializes the SSL library. To explicitely put the library to the approved mode the application can call the following function: - int FIPS_mode_set(int on) - if called with 1 as a parameter it will switch the library from the non-approved to the approved mode. If any of the selftests and integrity verification tests fail, the library is put into the error state and 0 is returned. If they succeed the return value is 1. To query the module whether it is in the approved mode or not: - int FIPS_mode(void) - returns 1 if the module is in the approved mode, 0 otherwise. To query whether the module is in the error state: - int FIPS_selftest_failed(void) - returns 1 if the module is in the error state, 0 otherwise. To zeroize the FIPS RNG key and internal state the application calls: - void RAND_cleanup(void) Possible error states of the OpenSSL FIPS module ================================================ The effects of self-test failures in the OpenSSL module differ depending on the type of self-test that failed. The FIPS_mode_set() function verifies the integrity of the runtime executable using a HMAC SHA-256 digest, which is computed at build time. If this computed HMAC SHA-256 digest matches the stored, known digest, then the power-up self-test (consisting of the algorithm-specific Pairwise Consistency and Known Answer tests) is performed. Non-fatal self-test errors transition the module into an error state. The application must be restarted to recover from these errors. The non-fatal self-test errors are: FIPS_R_FINGERPRINT_DOES_NOT_MATCH - the integrity verification check failed FIPS_R_FIPS_SELFTEST_FAILED - a known answer test failed FIPS_R_PAIRWISE_TEST_FAILED – a pairwise consistency test during DSA or RSA key generation failed FIPS_R_FIPS_MODE_ALREADY_SET - the application tries to initialize the FIPS approved mode when it is already initialized These errors are reported through the regular ERR interface of the OpenSSL library and can be queried by functions such as ERR_get_error(). See the OpenSSL manual page for the function description. A fatal error occurs only when the module is already in the error state (a self test has failed) and the application calls a crypto function of the module that cannot return an error in normal circumstances (void return functions). The error message: 'FATAL FIPS SELFTEST FAILURE' is printed to stderr and the application is terminated with the abort() call. The only way to recover from a fatal error is to restart the application. If failures persist, you must reinstall the Module. If you downloaded the software, verify the package hash to confirm a proper download.