nss: fix non-determinism when create a blank certificate

It uses certutil from nss to create a blank certificate. But the
checksum of database file key4.db changes every time:

$ certutil -N -d sql:. --empty-password
$ md5sum *
f9dac2cfcb07cc8ca6db442a9a570906  cert9.db
b892c5ff7c1977d4728240b0cf628377  key4.db
7b9136cb03f07ae62eb213a5239fda71  pkcs11.txt
$ rm *

$ certutil -N -d sql:. --empty-password
$ md5sum *
f9dac2cfcb07cc8ca6db442a9a570906  cert9.db
405d55178e866a115c1aa975fccfa764  key4.db
7b9136cb03f07ae62eb213a5239fda71  pkcs11.txt

Provide pre-created databases with a blank certificate to fix
non-determinism issue. And these database files are from nss qemux86-64
build.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

4 files changed, 18 insertions, 8 deletions

diff --git a/meta/recipes-support/nss/nss/blank-cert9.db b/meta/recipes-support/nss/nss/blank-cert9.db
new file mode 100644
index 0000000000..7d4bcf2582
--- /dev/null
+++ b/meta/recipes-support/nss/nss/blank-cert9.db
diff --git a/meta/recipes-support/nss/nss/blank-key4.db b/meta/recipes-support/nss/nss/blank-key4.db
new file mode 100644
index 0000000000..d47f08d04f
--- /dev/null
+++ b/meta/recipes-support/nss/nss/blank-key4.db
diff --git a/meta/recipes-support/nss/nss/system-pkcs11.txt b/meta/recipes-support/nss/nss/system-pkcs11.txt
new file mode 100644
index 0000000000..1a264e9cc4
--- /dev/null
+++ b/meta/recipes-support/nss/nss/system-pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:/etc/pki/nssdb' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/meta/recipes-support/nss/nss_3.38.bb b/meta/recipes-support/nss/nss_3.38.bb
index 904b621a07..e0ee209106 100644
--- a/meta/recipes-support/nss/nss_3.38.bb
+++ b/meta/recipes-support/nss/nss_3.38.bb
@@ -25,6 +25,9 @@ SRC_URI = "http://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/${VERSIO
            file://nss-fix-nsinstall-build.patch \
            file://disable-Wvarargs-with-clang.patch \
            file://pqg.c-ULL_addend.patch \
+           file://blank-cert9.db \
+           file://blank-key4.db \
+           file://system-pkcs11.txt \
            "
 
 SRC_URI[md5sum] = "ac9065460a7634ba8eb0f942f404e773"
@@ -212,14 +215,16 @@ do_install_append() {
 }
 
 do_install_append_class-target() {
-    # Create a blank certificate
-    mkdir -p ${D}${sysconfdir}/pki/nssdb/
-    touch ./empty_password
-    certutil -N -d sql:${D}${sysconfdir}/pki/nssdb/ -f ./empty_password
-    chmod 644 ${D}${sysconfdir}/pki/nssdb/*.db
-    rm ./empty_password
-    # Remove build path prefix
-    sed -i "s:${D}::g"  ${D}${sysconfdir}/pki/nssdb/pkcs11.txt
+    # It used to call certutil to create a blank certificate with empty password at
+    # build time, but the checksum of key4.db changes every time when certutil is called.
+    # It causes non-determinism issue, so provide databases with a blank certificate
+    # which are originally from output of nss in qemux86-64 build. You can get these
+    # databases by:
+    # certutil -N -d sql:/database/path/ --empty-password
+    install -d ${D}${sysconfdir}/pki/nssdb/
+    install -m 0644 ${WORKDIR}/blank-cert9.db ${D}${sysconfdir}/pki/nssdb/cert9.db
+    install -m 0644 ${WORKDIR}/blank-key4.db ${D}${sysconfdir}/pki/nssdb/key4.db
+    install -m 0644 ${WORKDIR}/system-pkcs11.txt ${D}${sysconfdir}/pki/nssdb/pkcs11.txt
 }
 
 PACKAGE_WRITE_DEPS += "nss-native"