certutil: add page (#8664)

pages/common/certutil.md

@@ -0,0 +1,24 @@
+# certutil
+
+> Manage keys and certificates in both NSS databases and other NSS tokens.
+> More information: <https://manned.org/certutil>.
+
+- Create a new certificate database:
+
+`certutil -N -d .`
+
+- List all certificates in a database:
+
+`certutil -L -d .`
+
+- List all private keys in a database:
+
+`certutil -K -d . -f {{path/to/pwdfile.txt}}`
+
+- Import the signed certificate into the requesters database:
+
+`certutil -A -n "{{Server-cert}}" -t ",," -i {{path/to/file.crt}} -d .`
+
+- Add subject alternative names to a given certificate:
+
+`certutil -S -f {{path/to/pwdfile.txt}} -d . -t ",," -c "{{Server-Cert}}" -n "{{server1}}" -g {{2048}} -s "CN={{testuser1}},O={{testrelm.test}}"`