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/*
* dpkg - main program for package management
* verify.c - verify package integrity
*
* Copyright © 2012-2015 Guillem Jover <guillem@debian.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/options.h>
#include <dpkg/db-ctrl.h>
#include <dpkg/db-fsys.h>
#include <dpkg/buffer.h>
#include "main.h"
enum verify_result {
VERIFY_NONE,
VERIFY_PASS,
VERIFY_FAIL,
};
struct verify_checks {
int exists_errno;
enum verify_result exists;
enum verify_result mode;
enum verify_result md5sum;
};
typedef void verify_output_func(struct fsys_namenode *, struct verify_checks *);
static int
verify_result_rpm(enum verify_result result, int check)
{
switch (result) {
case VERIFY_FAIL:
return check;
case VERIFY_PASS:
return '.';
case VERIFY_NONE:
default:
return '?';
}
}
static void
verify_output_rpm(struct fsys_namenode *namenode, struct verify_checks *checks)
{
char result[9];
char *error = NULL;
int attr;
memset(result, '?', sizeof(result));
if (checks->exists == VERIFY_FAIL) {
memcpy(result, "missing ", sizeof(result));
if (checks->exists_errno != ENOENT)
m_asprintf(&error, " (%s)", strerror(checks->exists_errno));
} else {
result[1] = verify_result_rpm(checks->mode, 'M');
result[2] = verify_result_rpm(checks->md5sum, '5');
}
if (namenode->flags & FNNF_OLD_CONFF)
attr = 'c';
else
attr = ' ';
printf("%.9s %c %s%s\n", result, attr, namenode->name, error ? error : "");
free(error);
}
static verify_output_func *verify_output = verify_output_rpm;
bool
verify_set_output(const char *name)
{
if (strcmp(name, "rpm") == 0)
verify_output = verify_output_rpm;
else
return false;
return true;
}
static int
verify_digest(const char *filename, struct fsys_namenode *fnn,
struct verify_checks *checks)
{
static int fd;
fd = open(filename, O_RDONLY);
if (fd >= 0) {
struct dpkg_error err;
char hash[MD5HASHLEN + 1];
push_cleanup(cu_closefd, ehflag_bombout, 1, &fd);
if (fd_md5(fd, hash, -1, &err) < 0)
ohshit(_("cannot compute MD5 digest for file '%s': %s"),
filename, err.str);
pop_cleanup(ehflag_normaltidy); /* fd = open(cdr.buf) */
close(fd);
if (strcmp(hash, fnn->newhash) == 0) {
checks->md5sum = VERIFY_PASS;
return 0;
} else {
checks->md5sum = VERIFY_FAIL;
}
} else {
checks->md5sum = VERIFY_NONE;
}
return -1;
}
static int
verify_file(const char *filename, struct fsys_namenode *fnn,
struct pkginfo *pkg, struct verify_checks *checks)
{
struct stat st;
int failures = 0;
if (lstat(filename, &st) < 0) {
checks->exists_errno = errno;
checks->exists = VERIFY_FAIL;
return 1;
}
checks->exists = VERIFY_PASS;
if (fnn->newhash == NULL && fnn->oldhash != NULL)
fnn->newhash = fnn->oldhash;
if (fnn->newhash != NULL) {
/* Mode check heuristic: If we know its digest, the pathname
* must be a regular file. */
if (!S_ISREG(st.st_mode)) {
checks->mode = VERIFY_FAIL;
failures++;
}
if (verify_digest(filename, fnn, checks) < 0)
failures++;
}
return failures;
}
static void
verify_package(struct pkginfo *pkg)
{
struct fsys_namenode_list *file;
struct varbuf filename = VARBUF_INIT;
ensure_packagefiles_available(pkg);
parse_filehash(pkg, &pkg->installed);
pkg_conffiles_mark_old(pkg);
for (file = pkg->files; file; file = file->next) {
struct verify_checks checks;
struct fsys_namenode *fnn;
fnn = namenodetouse(file->namenode, pkg, &pkg->installed);
varbuf_set_str(&filename, dpkg_fsys_get_dir());
varbuf_add_str(&filename, fnn->name);
memset(&checks, 0, sizeof(checks));
if (verify_file(varbuf_str(&filename), fnn, pkg, &checks) > 0)
verify_output(fnn, &checks);
}
varbuf_destroy(&filename);
}
int
verify(const char *const *argv)
{
struct pkginfo *pkg;
int rc = 0;
modstatdb_open(msdbrw_readonly);
ensure_diversions();
if (!*argv) {
struct pkg_hash_iter *iter;
iter = pkg_hash_iter_new();
while ((pkg = pkg_hash_iter_next_pkg(iter)))
verify_package(pkg);
pkg_hash_iter_free(iter);
} else {
const char *thisarg;
while ((thisarg = *argv++)) {
pkg = dpkg_options_parse_pkgname(cipaction, thisarg);
if (pkg->status == PKG_STAT_NOTINSTALLED) {
notice(_("package '%s' is not installed"),
pkg_name(pkg, pnaw_nonambig));
rc = 1;
continue;
}
verify_package(pkg);
}
}
modstatdb_shutdown();
m_output(stdout, _("<standard output>"));
return rc;
}
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