move doveauth scripts to its own python project

doveauth/doveauth.lua

@@ -0,0 +1,57 @@
+
+-- Escape shell argument by hex encoding it and wrapping in quotes.
+function escape(data)
+   b16 = data:gsub(".", function(char) return string.format("%2X", char:byte()) end)
+   return ("'"..b16.."'")
+end
+
+-- call out to python program to actually manage authentication for dovecot
+
+function chatctl_verify(user, password)
+    local cmd = "python3 /home/vmail/chatctl hexauth "..escape(user).." "..escape(password)
+    print("executing: "..cmd)
+    local handle = io.popen(cmd)
+    local result = handle:read("*a")
+    handle:close()
+    return split_chatctl(result)
+end
+
+function chatctl_lookup(user) 
+    assert(user)
+    local handle = io.popen("python3 /home/vmail/chatctl hexlookup "..escape(user))
+    local result = handle:read("*a")
+    handle:close()
+    return split_chatctl(result)
+end
+
+function get_extra_dovecot_output(res)
+    return {home=res.home, uid=res.uid, gid=res.gid}
+end
+
+
+function auth_password_verify(request, password)
+    local res = chatctl_verify(request.user, password)
+    -- request:log_error("auth_password_verify "..request.user.." "..password)
+    if res.status == "ok" then 
+        local extra = get_extra_dovecot_output(res)
+        return dovecot.auth.PASSDB_RESULT_OK, get_extra_dovecot_output(res)
+    end
+    return dovecot.auth.PASSDB_RESULT_PASSWORD_MISMATCH, ""
+end
+
+
+function auth_userdb_lookup(request)
+    local res = chatctl_lookup(request.user) 
+    if res.status == "ok" then
+        return dovecot.auth.USERDB_RESULT_OK, get_extra_dovecot_output(res)
+    end
+    return dovecot.auth.USERDB_RESULT_USER_UNKNOWN, "no such user"
+end
+
+function split_chatctl(output) 
+    local ret = {}
+    for key, value in output:gmatch "(%w+)%s*=%s*(%w+)" do
+        ret[key] = value
+    end
+    return ret
+end