The only curious thing with using "pkcs11.txt" is that is usually used
with the security databases. Per some of the manpages:
In 2009, NSS introduced a new set of databases that are SQLite databases
rather than BerkeleyDB. These new databases provide more accessibility and
performance:
• cert9.db for certificates
• key4.db for keys
• pkcs11.txt, a listing of all of the PKCS #11 modules, contained in a
new subdirectory in the security databases directory
Red Hat decided to use "nss.config" in Fedora for the system-wide policy
file, and the test at nss/tests/policy/policy.sh calls it "nss-policy".
Perhaps we should call it something different too? I don't really
understand the whole impact of this filename though, so my suggestion
may be unnecessary.
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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The upstream documentation is quite poor and outdated, unfortunately: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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