sec-updater: Checks for security updates
sec-updater checks for security updates and backports in Debian/ Ubuntu repositories and sets the security flags in the strongTNC policy database accordingly.
This commit is contained in:
Andreas Steffen
@@ -0,0 +1,454 @@
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/*
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* Copyright (C) 2012-2017 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#define _GNU_SOURCE
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#include <getopt.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <syslog.h>
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#include <time.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <library.h>
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#include <utils/debug.h>
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typedef enum sec_update_state_t sec_update_state_t;
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enum sec_update_state_t {
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SEC_UPDATE_STATE_BEGIN_PACKAGE,
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SEC_UPDATE_STATE_VERSION,
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SEC_UPDATE_STATE_END_PACKAGE
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};
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typedef struct stats_t stats_t;
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struct stats_t {
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time_t release;
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int product;
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int packages;
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int new_versions;
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int updated_versions;
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};
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/**
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* global debug output variables
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*/
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static int debug_level = 1;
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static bool stderr_quiet = FALSE;
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/**
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* sec_updater dbg function
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*/
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static void sec_updater_dbg(debug_t group, level_t level, char *fmt, ...)
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{
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int priority = LOG_INFO;
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char buffer[8192];
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char *current = buffer, *next;
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va_list args;
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if (level <= debug_level)
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{
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if (!stderr_quiet)
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{
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va_start(args, fmt);
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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}
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/* write in memory buffer first */
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va_start(args, fmt);
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vsnprintf(buffer, sizeof(buffer), fmt, args);
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va_end(args);
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/* do a syslog with every line */
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while (current)
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{
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next = strchr(current, '\n');
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if (next)
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{
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*(next++) = '\0';
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}
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syslog(priority, "%s\n", current);
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current = next;
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}
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}
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}
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/**
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* atexit handler to close everything on shutdown
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*/
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static void cleanup(void)
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{
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closelog();
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library_deinit();
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}
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static void usage(void)
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{
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printf("\
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Usage:\n\
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sec-updater --help\n\
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sec-updater [--debug <level>] [--quiet] [--security] --product <name> --file <filename>\n\n\
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Options:\n\
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--help print usage information\n\
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--debug set debug level\n\
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--quiet suppress debug output to stderr\n\
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--security set when parsing a file with security updates\n\
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--product <name> name of the Linux version as stored in the database\n\
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--file <filename> package information file to parse");
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}
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/**
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* Update the package database
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*/
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static bool update_database(database_t *db, char *package, char *version,
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bool security, stats_t *stats)
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{
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int pid = 0, vid = 0, sec_flag;
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bool first = TRUE, found = FALSE;
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char *release;
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enumerator_t *e;
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/* increment package count */
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stats->packages++;
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/* check if package is already in database */
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e = db->query(db, "SELECT id FROM packages WHERE name = ?",
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DB_TEXT, package, DB_INT);
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if (!e)
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{
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return FALSE;
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}
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if (!e->enumerate(e, &pid))
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{
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pid = 0;
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}
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e->destroy(e);
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if (!pid)
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{
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return TRUE;
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}
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/* retrieve all package versions stored in database */
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e = db->query(db,
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"SELECT id, release, security FROM versions "
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"WHERE product = ? AND package = ?",
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DB_INT, stats->product, DB_INT, pid, DB_INT, DB_TEXT, DB_INT);
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if (!e)
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{
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return FALSE;
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}
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while (e->enumerate(e, &vid, &release, &sec_flag))
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{
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char command[BUF_LEN];
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char found_char = ' ';
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bool update_version = FALSE;
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if (streq(version, release))
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{
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found = TRUE;
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found_char = '*';
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}
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else if (security)
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{
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snprintf(command, BUF_LEN, "dpkg --compare-versions %s lt %s",
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release, version);
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if (system(command) == 0)
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{
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found_char = '!';
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if (!sec_flag)
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{
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if (db->execute(db, NULL, "UPDATE versions "
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"SET security = 1 WHERE id = ?", DB_INT, vid) != 1)
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{
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DBG1(DBG_IMV, " could not update version");
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e->destroy(e);
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return FALSE;
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}
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update_version = TRUE;
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stats->updated_versions++;
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}
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}
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}
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if (debug_level < 2 && !update_version)
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{
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continue;
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}
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if (first)
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{
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DBG1(DBG_IMV, "%s", package);
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first = FALSE;
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}
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DBG1(DBG_IMV, " %c%s %s", found_char , sec_flag ? "s" : " ", release);
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}
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e->destroy(e);
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if (!found)
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{
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if (first)
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{
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DBG1(DBG_IMV, "%s", package);
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}
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DBG1(DBG_IMV, " + %s", version);
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if (db->execute(db, &vid,
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"INSERT INTO versions "
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"(package, product, release, security, time) "
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"VALUES (?, ?, ?, 0, ?)", DB_INT, pid, DB_INT, stats->product,
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DB_TEXT, version, DB_INT, stats->release) != 1)
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{
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DBG1(DBG_IMV, " could not store version to database");
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return FALSE;
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}
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stats->new_versions++;
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}
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return TRUE;
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}
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/**
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* Process a package file and store updates in the database
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*/
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static void process_packages(char *filename, char *product, bool security)
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{
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char *uri, line[BUF_LEN], *pos, *package = NULL, *version = NULL;
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sec_update_state_t state;
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enumerator_t *e;
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database_t *db;
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int pid;
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FILE *file;
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stats_t stats;
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bool success;
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/* initialize statistics */
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memset(&stats, 0x00, sizeof(stats_t));
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/* Set release date to current time */
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stats.release = time(NULL);
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/* opening package file */
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DBG1(DBG_IMV, "loading \"%s\"", filename);
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file = fopen(filename, "r");
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if (!file)
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{
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DBG1(DBG_IMV, " could not open \"%s\"", filename);
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exit(EXIT_FAILURE);
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}
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/* connect package database */
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uri = lib->settings->get_str(lib->settings, "sec-updater.database", NULL);
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if (!uri)
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{
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DBG1(DBG_IMV, "database URI sec-updater.database not set");
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fclose(file);
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exit(EXIT_FAILURE);
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}
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db = lib->db->create(lib->db, uri);
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if (!db)
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{
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DBG1(DBG_IMV, "could not connect to database '%s'", uri);
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fclose(file);
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exit(EXIT_FAILURE);
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}
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/* check if product is already in database */
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e = db->query(db, "SELECT id FROM products WHERE name = ?",
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DB_TEXT, product, DB_INT);
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if (e)
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{
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if (e->enumerate(e, &pid))
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{
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stats.product = pid;
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}
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e->destroy(e);
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}
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if (!stats.product)
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{
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if (db->execute(db, &pid, "INSERT INTO products (name) VALUES (?)",
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DB_TEXT, product) != 1)
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{
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DBG1(DBG_IMV, "could not store product '%s' to database",
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product);
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fclose(file);
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db->destroy(db);
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exit(EXIT_FAILURE);
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}
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stats.product = pid;
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}
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state = SEC_UPDATE_STATE_BEGIN_PACKAGE;
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while (fgets(line, sizeof(line), file))
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{
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/* set read pointer to beginning of line */
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pos = line;
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switch (state)
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{
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case SEC_UPDATE_STATE_BEGIN_PACKAGE:
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pos = strstr(pos, "Package: ");
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if (!pos)
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{
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continue;
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}
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pos += 9;
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package = pos;
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pos = strchr(pos, '\n');
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if (pos)
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{
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package = strndup(package, pos - package);
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state = SEC_UPDATE_STATE_VERSION;
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}
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break;
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case SEC_UPDATE_STATE_VERSION:
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pos = strstr(pos, "Version: ");
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if (!pos)
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{
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continue;
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}
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pos += 9;
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version = pos;
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pos = strchr(pos, '\n');
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if (pos)
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{
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version = strndup(version, pos - version);
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state = SEC_UPDATE_STATE_END_PACKAGE;
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}
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break;
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case SEC_UPDATE_STATE_END_PACKAGE:
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if (*pos != '\n')
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{
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continue;
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}
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success = update_database(db, package, version, security, &stats);
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free(package);
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free(version);
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if (!success)
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{
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fclose(file);
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db->destroy(db);
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exit(EXIT_FAILURE);
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}
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state = SEC_UPDATE_STATE_BEGIN_PACKAGE;
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}
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}
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switch (state)
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{
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case SEC_UPDATE_STATE_END_PACKAGE:
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free(version);
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/* fall-through */
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case SEC_UPDATE_STATE_VERSION:
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free(package);
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break;
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default:
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break;
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}
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fclose(file);
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db->destroy(db);
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DBG1(DBG_IMV, "processed \"%s\": %d packages, %d new versions, "
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"%d updated versions", filename, stats.packages,
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stats.new_versions, stats.updated_versions);
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}
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static void do_args(int argc, char *argv[])
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{
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char *filename = NULL, *product = NULL;
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bool security = FALSE;
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/* reinit getopt state */
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optind = 0;
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while (TRUE)
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{
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int c;
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struct option long_opts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "debug", required_argument, NULL, 'd' },
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{ "file", required_argument, NULL, 'f' },
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{ "product", required_argument, NULL, 'p' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "security", no_argument, NULL, 's' },
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{ 0,0,0,0 }
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};
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c = getopt_long(argc, argv, "", long_opts, NULL);
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switch (c)
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{
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case EOF:
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break;
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case 'h':
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usage();
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exit(EXIT_SUCCESS);
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case 'd':
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debug_level = atoi(optarg);
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continue;
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case 'f':
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filename = optarg;
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continue;
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case 'p':
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product = optarg;
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continue;
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case 'q':
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stderr_quiet = TRUE;
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continue;
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case 's':
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security = TRUE;
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continue;
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}
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break;
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}
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if (filename && product)
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{
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process_packages(filename, product, security);
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}
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else
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{
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usage();
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exit(EXIT_FAILURE);
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}
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}
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int main(int argc, char *argv[])
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{
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/* enable attest debugging hook */
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dbg = sec_updater_dbg;
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openlog("sec-updater", 0, LOG_DEBUG);
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atexit(cleanup);
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/* initialize library */
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if (!library_init(NULL, "sec-updater"))
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{
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exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
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}
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if (!lib->plugins->load(lib->plugins,
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lib->settings->get_str(lib->settings, "sec-updater.load", "sqlite")))
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{
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exit(SS_RC_INITIALIZATION_FAILED);
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}
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do_args(argc, argv);
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exit(EXIT_SUCCESS);
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}
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