pam_timestamp: replace hmac implementation

sha1 is no longer recommended as a cryptographic algorithm for
authentication. Thus, the idea of this change is to replace the
implementation provided by hmacsha1 included in pam_timestamp module by
the one in the openssl library. This way, there's no need to maintain
the cryptographic algorithm implementation and it can be easily changed
with a single configuration change.

modules/pam_timestamp/hmac_openssl_wrapper.c: implement wrapper
functions around openssl's hmac implementation. Moreover, manage the key
generation and its read and write in a file. Include an option to
configure the cryptographic algorithm in login.defs file.
modules/pam_timestamp/hmac_openssl_wrapper.h: likewise.
modules/pam_timestamp/pam_timestamp.c: replace calls to functions
provided by hmacsha1 by functions provided by openssl's wrapper.
configure.ac: include openssl dependecy if it is enabled.
modules/pam_timestamp/Makefile.am: include new files and openssl library
to compilation.
ci/install-dependencies.sh: include openssl library to dependencies.
NEWS: add new item to next release.
Make.xml.rules.in: add stringparam profiling for hmac
doc/custom-man.xsl: change import docbook to one with profiling
modules/pam_timestamp/pam_timestamp.8.xml: add conditional paragraph to
indicate the value in /etc/login.defs that holds the value for the
encryption algorithm

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1947294

1 files changed, 1 insertions, 0 deletions

diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
index b4274b4c..6b48ebb2 100755
--- a/ci/install-dependencies.sh
+++ b/ci/install-dependencies.sh
@@ -21,6 +21,7 @@ libaudit-dev
 libdb-dev
 libfl-dev
 libselinux1-dev
+libssl-dev
 libtool
 libxml2-utils
 make