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[Dariusz Gadomski <1885562@xxxxxxxxxxxxxxxxxx>]

As discussed with Richard outside LP: we agreed that adding symlinks is
an acceptable solution to this problem.

Debdiffs linked.

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https://bugs.launchpad.net/bugs/1885562

Title:
  [fips] freebl_fipsSoftwareIntegrityTest fails in FIPS mode

Status in nss package in Ubuntu:
  In Progress
Status in nss source package in Bionic:
  In Progress

Bug description:
  In FIPS mode there are some additional checks performed.

  They lead to verifying binaries signatures. Those signatures are
  shipped in the libnss3 package as *.chk files installed in
  /usr/lib/$(DEB_HOST_MULTIARCH)/nss. Along with those files are the
  libraries themselves (libfreebl3.so  libfreeblpriv3.so  libnssckbi.so
  libnssdbm3.so  libsoftokn3.so).

  Those libraries are symlinked to be present in /usr/lib/$(DEB_HOST_MULTIARCH):
  ls -l /usr/lib/x86_64-linux-gnu/libfreeblpriv3.so
  lrwxrwxrwx 1 root root 21 Jun 10 18:54 /usr/lib/x86_64-linux-gnu/libfreeblpriv3.so -> nss/libfreeblpriv3.so

  The client binaries are linked against the symlinks, so when the verification happens (lib/freebl/shvfy.c) the mkCheckFileName function takes path to the symlink to the shlib and replaces the .so extension with .chk.
  Then it tries to open that file. Obviosly it fails, because the actual file is in /usr/lib/$(DEB_HOST_MULTIARCH)/nss.

  [Test case]
  sudo apt install chrony
  sudo chronyd -d
  chronyd: util.c:373 UTI_IPToRefid: Assertion `MD5_hash >= 0' failed.

  Potential solutions:
  Solution A:
  Drop the /usr/lib/$(DEB_HOST_MULTIARCH)/nss directory and put all signatures and libs in /usr/lib/$(DEB_HOST_MULTIARCH).

  Solution B:
  Create symlinks to *.chk files in /usr/lib/$(DEB_HOST_MULTIARCH) (like it is done for *.so).

  Solution C:
  Implement and upstream NSS feature of resolving symlinks and looking for *.chk where the symlinks lead to.

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