check IMA file measurements against database reference

src/libpts/plugins/imv_attestation/imv_attestation_process.c

@@ -237,7 +237,7 @@ bool imv_attestation_process(pa_tnc_attr_t *attr, linked_list_t *attr_list,
 			}
 			else
 			{
-				measurements->insert(measurements, pts_db, platform_info);
+				measurements->check(measurements, pts_db, platform_info, algo);
 			}
 			break;
 		}

src/libpts/pts/pts_database.c

@@ -39,6 +39,38 @@ struct private_pts_database_t {
 
 };
 
+METHOD(pts_database_t, check_file_measurement, status_t,
+	private_pts_database_t *this, char *product, pts_meas_algorithms_t algo,
+	chunk_t measurement, char *filename)
+{
+	enumerator_t *e;
+	chunk_t hash;
+	status_t status;
+
+	e = this->db->query(this->db,
+		"SELECT fh.hash FROM file_hashes AS fh"
+		"JOIN files AS f ON f.id = fh.file"
+		"JOIN products AS p ON p.id = fh.product "
+		"WHERE p.product = ? AND f.file = ? AND fh.algo = ?",
+		DB_TEXT, product, DB_TEXT, filename, DB_INT, algo, DB_BLOB);
+	if (!e)
+	{
+		return FAILED;
+	}
+	if (e->enumerate(e, &hash))
+	{
+		status = chunk_equals(measurement, hash) ?
+				SUCCESS : VERIFY_ERROR;
+	}
+	else
+	{
+		status = NOT_FOUND;
+	}
+	e->destroy(e);
+
+	return status;
+}
+
 METHOD(pts_database_t, create_file_meas_enumerator, enumerator_t*,
 	private_pts_database_t *this, char *product)
 {

src/libpts/pts/pts_database.h

@@ -33,6 +33,19 @@ typedef struct pts_database_t pts_database_t;
  */
 struct pts_database_t {
 
+	/**
+	* Get files/directories to be measured by PTS
+	*
+	* @param product		Software product (os, vpn client, etc.)
+	* @param algo			File measurement hash algorithm used
+	* @param measurement	File measurement hash
+	* @param filename		Optional name of the file to be checked
+	* @return				Status
+	*/
+	status_t (*check_file_measurement)(pts_database_t *this, char *product,
+									   pts_meas_algorithms_t algo,
+									   chunk_t measurement, char *filename);
+
 	/**
 	* Get files/directories to be measured by PTS
 	*

src/libpts/pts/pts_file_meas.c

@@ -111,19 +111,47 @@ METHOD(pts_file_meas_t, create_enumerator, enumerator_t*,
 								   (void*)entry_filter, NULL, NULL);
 }
 
-METHOD(pts_file_meas_t, insert, bool,
-	private_pts_file_meas_t *this, pts_database_t *pts_db, char *product)
+METHOD(pts_file_meas_t, check, bool,
+	private_pts_file_meas_t *this, pts_database_t *pts_db, char *product,
+	pts_meas_algorithms_t algo)
 {
 	enumerator_t *enumerator;
 	entry_t *entry;
+	char *status_msg;
+	int count_ok = 0, count_not_found = 0, count_differ = 0;
+	status_t status;
 
 	enumerator = this->list->create_enumerator(this->list);
 	while (enumerator->enumerate(enumerator, &entry))
 	{
-		DBG2(DBG_PTS, "  %#B for '%s'", &entry->measurement, entry->filename);
+		status = pts_db->check_file_measurement(pts_db, product, algo,
+									entry->measurement, entry->filename);
+		switch (status)
+		{
+			case SUCCESS:
+				status_msg = "ok";
+				count_ok++;
+				break;
+			case NOT_FOUND:
+				status_msg = "not found";
+				count_not_found++;
+				break;
+			case VERIFY_ERROR:
+				status_msg = "differs";
+				count_differ++;
+				break;
+			case FAILED:
+			default:
+				status_msg = "failed";
+		}
+		DBG2(DBG_PTS, "  %#B for '%s' - %s", &entry->measurement,
+			 entry->filename, status_msg);
 	}
 	enumerator->destroy(enumerator);
 
+	DBG1(DBG_PTS, "%d measurements, %d ok, %d not found, %d differ",
+		 this->list->get_count(this->list),
+		 count_ok, count_not_found, count_differ);
 	return TRUE;
 }
 
@@ -194,7 +222,7 @@ pts_file_meas_t *pts_file_meas_create(u_int16_t request_id)
 			.get_file_count = _get_file_count,
 			.add = _add,
 			.create_enumerator = _create_enumerator,
-			.insert = _insert,
+			.check = _check,
 			.verify = _verify,
 			.destroy = _destroy,
 		},
@@ -280,7 +308,7 @@ pts_file_meas_t *pts_file_meas_create_from_path(u_int16_t request_id,
 			.get_file_count = _get_file_count,
 			.add = _add,
 			.create_enumerator = _create_enumerator,
-			.insert = _insert,
+			.check = _check,
 			.verify = _verify,
 			.destroy = _destroy,
 		},

src/libpts/pts/pts_file_meas.h

@@ -62,13 +62,15 @@ struct pts_file_meas_t {
 	enumerator_t* (*create_enumerator)(pts_file_meas_t *this);
 
 	/**
-	 * Insert PTS File Measurements into the database
+	 * Check PTS File Measurements against reference value in the database
 	 *
 	 * @param db			PTS Measurement database
 	 * @param product		Software product (os, vpn client, etc.)
-	 * @return				TRUE if all measurements could be inserted
+	 * @param algo			PTS Measurement algorithm used
+	 * @return				TRUE if all measurements agreed
 	 */
-	bool (*insert)(pts_file_meas_t *this, pts_database_t *db, char* product);
+	bool (*check)(pts_file_meas_t *this, pts_database_t *db, char* product,
+				  pts_meas_algorithms_t algo);
 
 	/**
 	 * Verify stored hashes against PTS File Measurements