rlgwebd: switch to dgamelaunch's SQLite database.

The quickrypt utility is replaced with sqlickrypt, which takes a username
and password pair and checks them against the SQLite password database
used by dgamelaunch.  This will be more extensible to using rlgwebd to
register, change passwords, etc.

quickrypt.c

@@ -1,31 +0,0 @@
-/*
- * quickrypt: a quick and dirty crypt(3) utility for use with node.js.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <crypt.h>
-
-int main(int argc, char *argv[]) {
-  char clear[32], enc[120], *ptr;
-  fgets(&clear, 32, stdin);
-  if (!(ptr = strchr(&clear, '\n')))
-    return 1;
-  else
-    *ptr = '\0';
-  fgets(&enc, 120, stdin);
-  if (!(ptr = strchr(&enc, '\n')))
-    return 1;
-  else
-    *ptr = '\0';
-  ptr = crypt(clear, enc);
-  if (!strcmp(argv[argc - 1], "-s")) {
-    /* Option -s for "show": output the encrypted version. */
-    printf("%s\n", ptr);
-    return 0;
-  }
-  /* Otherwise this is a check. */
-  else if (!strcmp(ptr, enc))
-    return 0;
-  return 1;
-}

rlgwebd.js

@@ -296,7 +296,12 @@ function login(req, res, formdata) {
     // check the password
     if (code != 0) {
       sendError(res, 3);
+      if (code == 1)
         console.log("Password check failed for user " + username);
+      else if (code == 2)
+        console.log("Attempted login by nonexistent user " + username);
+      else
+        console.log("Login failed: sqlickrypt error " + code);
       return;
     }
     // check for an existing game
@@ -306,6 +311,7 @@ function login(req, res, formdata) {
         for (var i = 0; i < files.length; i++) {
           if (files[i].match(fre)) {
             sendError(res, 4, null);
+            console.log(username + " is already playing " + gname);
             return;
           }
         }
@@ -314,27 +320,10 @@ function login(req, res, formdata) {
       startgame();
     });
   }
-  /* Look for the user in the password file */
-  fs.readFile(passwdfile, "utf8", function(err, data) {
-    if (err) {
-      sendError(res, 3);
-      console.log("Can't authenticate: " + err.toString());
-      return;
-    }
-    var dlines = data.split('\n');
-    for (var n = 0; n < dlines.length; n++) {
-      var fields = dlines[n].split(':');
-      if (fields[0] == username) {
-        // check the password with the quickrypt utility
-        checker = require('child_process').spawn("/bin/quickrypt")
+  /* Launch the sqlickrypt utility to check the password. */
+  var checker = require('child_process').spawn("/bin/sqlickrypt");
   checker.on("exit", checkit);
-        checker.stdin.end(password + '\n' + fields[2] + '\n', "utf8");
-        return;
-      }
-    }
-    sendError(res, 3);
-    console.log("Attempted login by nonexistent user " + username);
-  });
+  checker.stdin.end(username + '\n' + password + '\n', "utf8");
   return;
 }
 

sqlickrypt.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <sqlite3.h>
+#include <unistd.h>
+#include <crypt.h>
+
+#define DATABASE "/dgldir/dgamelaunch.db"
+
+int xcallback(void *targ, int ncols, char **vals, char **colnames) {
+  char *pws;
+  int j;
+  pws = *((char **) targ);
+  if (pws == NULL) {
+    for (j = 0; j < ncols; j++) {
+      if (!strcmp(colnames[j], "password"))
+        *((char **) targ) = strdup(vals[j]);
+    }
+  }
+  /* Otherwise, this isn't the first row. */
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  char ibuf[160], *uname, *pw, *pwhash = NULL, *comphash;
+  char finduser_sql[160];
+  char *cptr; // Utility pointer
+  sqlite3 *db;
+  int status;
+
+  /* Read in the username and password */
+  fgets(ibuf, 160, stdin);
+  uname = ibuf;
+  pw = strchr(uname, '\n');
+  if (pw == NULL)
+    exit(4); /* Truncated */
+  *pw = '\0';
+  pw++;
+  fgets(pw, 160 - (pw - ibuf), stdin);
+  if (pw[strlen(pw) - 1] == '\n')
+    pw[strlen(pw) - 1] = '\0';
+  else
+    exit(4); /* Truncated */
+  /* Sanitize the username, because it gets put into a query. */
+  for (cptr = uname; *cptr != '\0'; cptr++) {
+    if (!isalnum(*cptr)) {
+      exit(4);
+    }
+  }
+  /* Construct the query */
+  strcpy(finduser_sql, "SELECT * FROM dglusers WHERE username='");
+  strncat(finduser_sql, uname, 40);
+  strcat(finduser_sql, "';");
+
+  status = sqlite3_open(DATABASE, &db);
+  if (status) {
+    sqlite3_close(db);
+    return 1;
+  }
+  sqlite3_exec(db, finduser_sql, xcallback, (void *) &pwhash, NULL);
+
+  sqlite3_close(db);
+
+  /* Now check the password. */
+  if (pwhash == NULL) {
+    return 2;
+  }
+  comphash = crypt(pw, pwhash);
+  if (!strcmp(pwhash, comphash))
+    return 0;
+  return 1;
+}