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/* audit.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include "apk_applet.h"
#include "apk_database.h"
struct audit_ctx {
unsigned int open_flags;
int check_permissions : 1;
int (*audit)(struct audit_ctx *actx, struct apk_database *db);
};
static int audit_file(struct audit_ctx *actx,
struct apk_database *db,
struct apk_db_file *dbf,
const char *name)
{
struct apk_file_info fi;
if (dbf == NULL)
return 'A';
if (apk_file_get_info(db->root_fd, name, APK_FI_NOFOLLOW | dbf->csum.type, &fi) != 0)
return 0;
if (dbf->csum.type != APK_CHECKSUM_NONE &&
apk_checksum_compare(&fi.csum, &dbf->csum) == 0)
return 'U';
if (S_ISLNK(fi.mode) && dbf->csum.type == APK_CHECKSUM_NONE)
return 'U';
if (actx->check_permissions &&
(dbf->mode != 0 || dbf->uid != 0 || dbf->gid != 0)) {
if ((fi.mode & 07777) != (dbf->mode & 07777))
return 'M';
if (fi.uid != dbf->uid || fi.gid != dbf->gid)
return 'M';
}
return 0;
}
static int audit_directory(struct audit_ctx *actx,
struct apk_database *db,
struct apk_db_dir *dbd,
struct apk_file_info *fi)
{
if (dbd == NULL)
return 'D';
if (actx->check_permissions &&
(dbd->mode != 0 || dbd->uid != 0 || dbd->gid != 0)) {
if ((fi->mode & 07777) != (dbd->mode & 07777))
return 'm';
if (fi->uid != dbd->uid || fi->gid != dbd->gid)
return 'm';
}
return 0;
}
struct audit_tree_ctx {
struct audit_ctx *actx;
struct apk_database *db;
};
static int audit_directory_tree(apk_hash_item item, void *ctx)
{
struct audit_tree_ctx *atctx = (struct audit_tree_ctx *) ctx;
struct audit_ctx *actx = atctx->actx;
struct apk_database *db = atctx->db;
struct apk_db_dir *dbd = (struct apk_db_dir *) item;
struct apk_file_info fi;
struct dirent *de;
apk_blob_t bdir = APK_BLOB_PTR_LEN(dbd->name, dbd->namelen);
char tmp[PATH_MAX], reason;
DIR *dir;
if (!(dbd->flags & APK_DBDIRF_PROTECTED))
return 0;
dir = fdopendir(openat(db->root_fd, dbd->name, O_RDONLY | O_CLOEXEC));
if (dir == NULL)
return 0;
while ((de = readdir(dir)) != NULL) {
if (strcmp(de->d_name, ".") == 0 ||
strcmp(de->d_name, "..") == 0)
continue;
snprintf(tmp, sizeof(tmp), "%s/%s", dbd->name, de->d_name);
if (apk_file_get_info(db->root_fd, tmp, APK_FI_NOFOLLOW, &fi) < 0)
continue;
if ((dbd->flags & APK_DBDIRF_SYMLINKS_ONLY) &&
!S_ISLNK(fi.mode))
continue;
if (S_ISDIR(fi.mode)) {
struct apk_db_dir *dbd;
dbd = apk_db_dir_query(db, APK_BLOB_STR(tmp));
reason = audit_directory(actx, db, dbd, &fi);
} else {
struct apk_db_file *dbf;
dbf = apk_db_file_query(db, bdir, APK_BLOB_STR(de->d_name));
reason = audit_file(actx, db, dbf, tmp);
}
if (reason) {
if (apk_verbosity < 1)
printf("%s\n", tmp);
else
printf("%c %s\n", reason, tmp);
}
}
closedir(dir);
return 0;
}
static int audit_backup(struct audit_ctx *actx, struct apk_database *db)
{
struct audit_tree_ctx atctx = {
.actx = actx,
.db = db,
};
return apk_hash_foreach(&db->installed.dirs, audit_directory_tree, &atctx);
}
static int audit_system(struct audit_ctx *actx, struct apk_database *db)
{
struct apk_installed_package *ipkg;
struct apk_package *pkg;
struct apk_db_dir_instance *diri;
struct apk_db_file *file;
struct hlist_node *dn, *fn;
char name[PATH_MAX];
int done;
list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list) {
pkg = ipkg->pkg;
hlist_for_each_entry(diri, dn, &ipkg->owned_dirs, pkg_dirs_list) {
if (diri->dir->flags & APK_DBDIRF_PROTECTED)
continue;
done = 0;
hlist_for_each_entry(file, fn, &diri->owned_files,
diri_files_list) {
snprintf(name, sizeof(name), "%s/%s",
diri->dir->name, file->name);
if (audit_file(actx, db, file, name) == 0)
continue;
if (apk_verbosity < 1) {
printf("%s\n", pkg->name->name);
done = 1;
break;
}
printf("M %s\n", name);
}
if (done)
break;
}
}
return 0;
}
static int audit_parse(void *ctx, struct apk_db_options *dbopts,
int optch, int optindex, const char *optarg)
{
struct audit_ctx *actx = (struct audit_ctx *) ctx;
switch (optch) {
case 0x10000:
actx->audit = audit_backup;
break;
case 0x10001:
actx->audit = audit_system;
break;
case 0x10002:
actx->check_permissions = 1;
break;
default:
return -1;
}
return 0;
}
static int audit_main(void *ctx, struct apk_database *db, int argc, char **argv)
{
struct audit_ctx *actx = (struct audit_ctx *) ctx;
if (actx->audit == NULL)
return -EINVAL;
return actx->audit(actx, db);
}
static struct apk_option audit_options[] = {
{ 0x10000, "backup",
"List all modified configuration files that need to be backed up" },
{ 0x10001, "system", "Verify checksums of all installed files "
"(-q to print only modfied packages)" },
{ 0x10002, "check-permissions", "Check file and directory uid/gid/mode too" },
};
static struct apk_applet apk_audit = {
.name = "audit",
.help = "Audit the filesystem for changes compared to installed "
"database.",
.open_flags = APK_OPENF_READ|APK_OPENF_NO_SCRIPTS|APK_OPENF_NO_REPOS,
.context_size = sizeof(struct audit_ctx),
.num_options = ARRAY_SIZE(audit_options),
.options = audit_options,
.parse = audit_parse,
.main = audit_main,
};
APK_DEFINE_APPLET(apk_audit);
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