I have briefly analyzed nss code - it uses the nspr library for, inter
alia, file access abstraction. From what I saw in the docs it does not
offer any form of symlink resolution, so it may be nontrivial to safely
implement it in nss code.

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  [fips] freebl_fipsSoftwareIntegrityTest fails in FIPS mode

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

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

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