userdb: Use protocol buffers instead of our custom format

Protocol buffers are a more portable, practical and safe format for the user
database.

test/.gitignore

@@ -0,0 +1,4 @@
+
+# Ignore the user databases - we create them each time.
+t-*/config/**/users
+

test/t-01-simple_local/config/domains/testserver/users

@@ -1,2 +0,0 @@
-#chasquid-userdb-v1
-user SCRYPT@n:14,r:8,p:1,l:32,r00XqNmRkV505R2X6KT8+Q== aAiBBIVNNzmDXwxLLdJezFuxGtc2/wcHsy3FiOMAH4c=

test/t-01-simple_local/run.sh

@@ -6,6 +6,7 @@ set -e
 init
 
 generate_certs_for testserver
+add_user testserver user secretpassword
 
 mkdir -p .logs
 chasquid -v=2 --log_dir=.logs --config_dir=config &

test/t-02-exim/config/domains/srv-chasquid/users

@@ -1,2 +0,0 @@
-#chasquid-userdb-v1
-user SCRYPT@n:14,r:8,p:1,l:32,r00XqNmRkV505R2X6KT8+Q== aAiBBIVNNzmDXwxLLdJezFuxGtc2/wcHsy3FiOMAH4c=

test/t-02-exim/run.sh

@@ -33,6 +33,7 @@ mkdir -p .exim4
 EXIMDIR="$PWD/.exim4" envsubst < config/exim4.in > .exim4/config
 
 generate_certs_for srv-chasquid
+add_user srv-chasquid user secretpassword
 
 # Launch chasquid at port 1025 (in config).
 # Use outgoing port 2025 which is where exim will be at.

test/util/lib.sh

@@ -32,6 +32,14 @@ function chasquid() {
 		go run ${TBASE}/../../chasquid.go "$@"
 }
 
+function add_user() {
+	go run ${TBASE}/../../cmd/chasquid-userdb/chasquid-userdb.go \
+		--database "config/domains/${1}/users" \
+		--add_user "${2}" \
+		--password "${3}" \
+		>> .add_user_logs
+}
+
 function run_msmtp() {
 	# msmtp will check that the rc file is only user readable.
 	chmod 600 msmtprc