ACK on the policy file location change.

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https://bugs.launchpad.net/bugs/2016303

Title:
  Rebuild NSS with support for system-wide config file

Status in nss package in Ubuntu:
  Confirmed

Bug description:
  NSS should be rebuilt with this patch:

  diff --git a/debian/libnss3.dirs b/debian/libnss3.dirs
  new file mode 100644
  index 00000000..0f796964
  --- /dev/null
  +++ b/debian/libnss3.dirs
  @@ -0,0 +1 @@
  +etc/nss
  diff --git a/debian/rules b/debian/rules
  index 5ab1ced0..51bee160 100755
  --- a/debian/rules
  +++ b/debian/rules
  @@ -128,6 +128,8 @@ override_dh_auto_build:
                  NSS_USE_SYSTEM_SQLITE=1 \
                  NSS_ENABLE_ECC=1 \
                  CHECKLOC= \
  +               POLICY_FILE=pkcs11.txt \
  +               POLICY_PATH=/etc/nss \
                  $(TOOLCHAIN)

   override_dh_auto_clean:

  The directory could be another one, of course. This will allow us to
  create a system-wide /etc/nss/pkcs11.txt file which could load the NSS
  policy module.

  The upstream documentation is quite poor and outdated, unfortunately:
  
https://firefox-source-docs.mozilla.org/security/nss/legacy/nss_config_options/
  
https://firefox-source-docs.mozilla.org/security/nss/legacy/pkcs11/module_specs/index.html

  The current source code is the best documentation, and has a ton of
  tests that show how to use the policy module:

  - allow/disallow options: 
https://git.launchpad.net/ubuntu/+source/nss/tree/nss/lib/pk11wrap/pk11pars.c#n144
  - versions and key sizes: 
https://git.launchpad.net/ubuntu/+source/nss/tree/nss/lib/pk11wrap/pk11pars.c#n437
  - other qualifiers for algorithms (which types of signatures): 
https://git.launchpad.net/ubuntu/+source/nss/tree/nss/lib/pk11wrap/pk11pars.c#n451
  - tons of policy tests: 
https://git.launchpad.net/ubuntu/+source/nss/tree/nss/tests/ssl/sslpolicy.txt 
and https://git.launchpad.net/ubuntu/+source/nss/tree/nss/tests/policy

  Here is a sample /etc/nss/pkcs11.txt which enables the policy module with 
certain values:
  library=
  name=Policy
  NSS=flags=policyOnly,moduleDB
  config="disallow=ALL 
allow=HMAC-SHA256:HMAC-SHA1:HMAC-SHA384:HMAC-SHA512:CURVE25519:SECP256R1:SECP384R1:SECP521R1:aes256-gcm:chacha20-poly1305:aes256-cbc:aes128-gcm:aes128-cbc:SHA256:SHA384:SHA512:SHA224:ECDHE-RSA:ECDHE-ECDSA:RSA:DHE-RSA:ECDSA:RSA-PSS:RSA-PKCS:tls-version-min=tls1.2:dtls-version-min=dtls1.2:DH-MIN=2048:DSA-MIN=2048:RSA-MIN=2048"

  The same config snippet can of course be used in ~/.pki/nssdb/pkcs11.txt or 
in any of the other many places we have a pkcs11.txt file on the system (hence 
the need for this build option: to have just one place):
  - firefox: ~/snap/firefox/common/.mozilla/firefox/pqx65eu1.default/pkcs11.txt
  - thunderbid: ~/.thunderbird/6mxs87xg.default-release/pkcs11.txt
  - chrome and system-provided libnss3: ~/.pki/nssdb/pkcs11.txt

  Note thunderbird ships its own libnss3 (zomg), and would not be
  affected by this build change (unless it's done in the thunderbird
  source package too).

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