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-rw-r--r--src/statoverride/main.c421
1 files changed, 421 insertions, 0 deletions
diff --git a/src/statoverride/main.c b/src/statoverride/main.c
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index 0000000..66fe8c3
--- /dev/null
+++ b/src/statoverride/main.c
@@ -0,0 +1,421 @@
+/*
+ * dpkg-statoverride - override ownership and mode of files
+ *
+ * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org>
+ * Copyright © 2006-2015 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 <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#if HAVE_LOCALE_H
+#include <locale.h>
+#endif
+#include <string.h>
+#include <grp.h>
+#include <pwd.h>
+#include <fnmatch.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <dpkg/i18n.h>
+#include <dpkg/dpkg.h>
+#include <dpkg/dpkg-db.h>
+#include <dpkg/debug.h>
+#include <dpkg/string.h>
+#include <dpkg/path.h>
+#include <dpkg/dir.h>
+#include <dpkg/glob.h>
+#include <dpkg/db-fsys.h>
+#include <dpkg/options.h>
+
+#include "force.h"
+#include "actions.h"
+#include "security-mac.h"
+
+static const char printforhelp[] = N_(
+"Use --help for help about overriding file stat information.");
+
+static int
+printversion(const char *const *argv)
+{
+ printf(_("Debian %s version %s.\n"), dpkg_get_progname(),
+ PACKAGE_RELEASE);
+
+ printf(_(
+"This is free software; see the GNU General Public License version 2 or\n"
+"later for copying conditions. There is NO warranty.\n"));
+
+ m_output(stdout, _("<standard output>"));
+
+ return 0;
+}
+
+static int
+usage(const char *const *argv)
+{
+ printf(_(
+"Usage: %s [<option> ...] <command>\n"
+"\n"), dpkg_get_progname());
+
+ printf(_(
+"Commands:\n"
+" --add <owner> <group> <mode> <path>\n"
+" add a new <path> entry into the database.\n"
+" --remove <path> remove <path> from the database.\n"
+" --list [<glob-pattern>] list current overrides in the database.\n"
+"\n"));
+
+ printf(_(
+"Options:\n"
+" --admindir <directory> set the directory with the statoverride file.\n"
+" --instdir <directory> set the root directory, but not the admin dir.\n"
+" --root <directory> set the directory of the root filesystem.\n"
+" --update immediately update <path> permissions.\n"
+" --force deprecated alias for --force-all.\n"
+" --force-<thing>[,...] override problems (see --force-help).\n"
+" --no-force-<thing>[,...] stop when problems encountered.\n"
+" --refuse-<thing>[,...] ditto.\n"
+" --quiet quiet operation, minimal output.\n"
+" --help show this help message.\n"
+" --version show the version.\n"
+"\n"));
+
+ m_output(stdout, _("<standard output>"));
+
+ return 0;
+}
+
+#define FORCE_STATCMD_MASK \
+ FORCE_NON_ROOT | \
+ FORCE_SECURITY_MAC | FORCE_STATOVERRIDE_ADD | FORCE_STATOVERRIDE_DEL
+
+static int opt_verbose = 1;
+static int opt_update = 0;
+
+static char *
+path_cleanup(const char *path)
+{
+ char *new_path = m_strdup(path);
+
+ path_trim_slash_slashdot(new_path);
+ if (opt_verbose && strcmp(path, new_path) != 0)
+ warning(_("stripping trailing /"));
+
+ return new_path;
+}
+
+static struct file_stat *
+statdb_node_new(const char *user, const char *group, const char *mode)
+{
+ struct file_stat *filestat;
+
+ filestat = nfmalloc(sizeof(*filestat));
+
+ filestat->uid = statdb_parse_uid(user);
+ if (filestat->uid == (uid_t)-1)
+ ohshit(_("user '%s' does not exist"), user);
+ filestat->uname = NULL;
+ filestat->gid = statdb_parse_gid(group);
+ if (filestat->gid == (gid_t)-1)
+ ohshit(_("group '%s' does not exist"), group);
+ filestat->gname = NULL;
+ filestat->mode = statdb_parse_mode(mode);
+
+ return filestat;
+}
+
+static struct file_stat **
+statdb_node_find(const char *filename)
+{
+ struct fsys_namenode *file;
+
+ file = fsys_hash_find_node(filename, 0);
+
+ return &file->statoverride;
+}
+
+static int
+statdb_node_remove(const char *filename)
+{
+ struct fsys_namenode *file;
+
+ file = fsys_hash_find_node(filename, FHFF_NONE);
+ if (!file || !file->statoverride)
+ return 0;
+
+ file->statoverride = NULL;
+
+ return 1;
+}
+
+static void
+statdb_node_apply(const char *filename, struct file_stat *filestat)
+{
+ int rc;
+
+ rc = chown(filename, filestat->uid, filestat->gid);
+ if (forcible_nonroot_error(rc) < 0)
+ ohshite(_("error setting ownership of '%.255s'"), filename);
+ rc = chmod(filename, filestat->mode & ~S_IFMT);
+ if (forcible_nonroot_error(rc) < 0)
+ ohshite(_("error setting permissions of '%.255s'"), filename);
+
+ dpkg_selabel_load();
+ dpkg_selabel_set_context(filename, filename, filestat->mode);
+ dpkg_selabel_close();
+}
+
+static void
+statdb_node_print(FILE *out, struct fsys_namenode *file)
+{
+ struct file_stat *filestat = file->statoverride;
+ struct passwd *pw;
+ struct group *gr;
+
+ if (!filestat)
+ return;
+
+ pw = getpwuid(filestat->uid);
+ if (pw)
+ fprintf(out, "%s ", pw->pw_name);
+ else if (filestat->uname)
+ fprintf(out, "%s ", filestat->uname);
+ else
+ fprintf(out, "#%d ", filestat->uid);
+
+ gr = getgrgid(filestat->gid);
+ if (gr)
+ fprintf(out, "%s ", gr->gr_name);
+ else if (filestat->gname)
+ fprintf(out, "%s ", filestat->gname);
+ else
+ fprintf(out, "#%d ", filestat->gid);
+
+ fprintf(out, "%o %s\n", filestat->mode & ~S_IFMT, file->name);
+}
+
+static void
+statdb_write(void)
+{
+ char *dbname;
+ struct atomic_file *dbfile;
+ struct fsys_hash_iter *iter;
+ struct fsys_namenode *file;
+
+ dbname = dpkg_db_get_path(STATOVERRIDEFILE);
+ dbfile = atomic_file_new(dbname, ATOMIC_FILE_BACKUP);
+ atomic_file_open(dbfile);
+
+ iter = fsys_hash_iter_new();
+ while ((file = fsys_hash_iter_next(iter)))
+ statdb_node_print(dbfile->fp, file);
+ fsys_hash_iter_free(iter);
+
+ atomic_file_sync(dbfile);
+ atomic_file_close(dbfile);
+ atomic_file_commit(dbfile);
+ atomic_file_free(dbfile);
+
+ dir_sync_path(dpkg_db_get_dir());
+
+ free(dbname);
+}
+
+static int
+statoverride_add(const char *const *argv)
+{
+ const char *user = argv[0];
+ const char *group = argv[1];
+ const char *mode = argv[2];
+ const char *path = argv[3];
+ char *filename;
+ struct file_stat **filestat;
+
+ if (!user || !group || !mode || !path || argv[4])
+ badusage(_("--%s needs four arguments"), cipaction->olong);
+
+ if (strchr(path, '\n'))
+ badusage(_("path may not contain newlines"));
+
+ ensure_statoverrides(STATDB_PARSE_LAX);
+
+ filename = path_cleanup(path);
+
+ filestat = statdb_node_find(filename);
+ if (*filestat != NULL) {
+ if (in_force(FORCE_STATOVERRIDE_ADD))
+ warning(_("an override for '%s' already exists, "
+ "but --force specified so will be ignored"),
+ filename);
+ else
+ ohshit(_("an override for '%s' already exists; "
+ "aborting"), filename);
+ }
+
+ *filestat = statdb_node_new(user, group, mode);
+
+ if (opt_update) {
+ struct stat st;
+ struct varbuf realfilename = VARBUF_INIT;
+
+ varbuf_add_str(&realfilename, dpkg_fsys_get_dir());
+ varbuf_add_str(&realfilename, filename);
+ varbuf_end_str(&realfilename);
+
+ if (stat(realfilename.buf, &st) == 0) {
+ (*filestat)->mode |= st.st_mode & S_IFMT;
+ statdb_node_apply(realfilename.buf, *filestat);
+ } else if (opt_verbose) {
+ warning(_("--update given but %s does not exist"),
+ realfilename.buf);
+ }
+
+ varbuf_destroy(&realfilename);
+ }
+
+ statdb_write();
+
+ free(filename);
+
+ return 0;
+}
+
+static int
+statoverride_remove(const char *const *argv)
+{
+ const char *path = argv[0];
+ char *filename;
+
+ if (!path || argv[1])
+ badusage(_("--%s needs a single argument"), "remove");
+
+ ensure_statoverrides(STATDB_PARSE_LAX);
+
+ filename = path_cleanup(path);
+
+ if (!statdb_node_remove(filename)) {
+ if (opt_verbose)
+ warning(_("no override present"));
+ if (in_force(FORCE_STATOVERRIDE_DEL))
+ return 0;
+ else
+ return 2;
+ }
+
+ if (opt_update && opt_verbose)
+ warning(_("--update is useless for --remove"));
+
+ statdb_write();
+
+ free(filename);
+
+ return 0;
+}
+
+static int
+statoverride_list(const char *const *argv)
+{
+ struct fsys_hash_iter *iter;
+ struct fsys_namenode *file;
+ const char *thisarg;
+ struct glob_node *glob_list = NULL;
+ int ret = 1;
+
+ ensure_statoverrides(STATDB_PARSE_LAX);
+
+ while ((thisarg = *argv++)) {
+ char *pattern = path_cleanup(thisarg);
+
+ glob_list_prepend(&glob_list, pattern);
+ }
+ if (glob_list == NULL)
+ glob_list_prepend(&glob_list, m_strdup("*"));
+
+ iter = fsys_hash_iter_new();
+ while ((file = fsys_hash_iter_next(iter))) {
+ struct glob_node *g;
+
+ for (g = glob_list; g; g = g->next) {
+ if (fnmatch(g->pattern, file->name, 0) == 0) {
+ statdb_node_print(stdout, file);
+ ret = 0;
+ break;
+ }
+ }
+ }
+ fsys_hash_iter_free(iter);
+
+ glob_list_free(glob_list);
+
+ return ret;
+}
+
+static void
+set_force_obsolete(const struct cmdinfo *cip, const char *value)
+{
+ warning(_("deprecated --%s option; use --%s instead"),
+ cip->olong, "force-all");
+ set_force(FORCE_ALL);
+}
+
+static const struct cmdinfo cmdinfos[] = {
+ ACTION("add", 0, act_install, statoverride_add),
+ ACTION("remove", 0, act_remove, statoverride_remove),
+ ACTION("list", 0, act_listfiles, statoverride_list),
+ ACTION("help", '?', act_help, usage),
+ ACTION("version", 0, act_version, printversion),
+
+ { "admindir", 0, 1, NULL, NULL, set_admindir, 0 },
+ { "instdir", 0, 1, NULL, NULL, set_instdir, 0 },
+ { "root", 0, 1, NULL, NULL, set_root, 0 },
+ { "quiet", 0, 0, &opt_verbose, NULL, NULL, 0 },
+ { "force", 0, 0, NULL, NULL, set_force_obsolete },
+ { "force", 0, 2, NULL, NULL, set_force_option, 1 },
+ { "no-force", 0, 2, NULL, NULL, set_force_option, 0 },
+ { "refuse", 0, 2, NULL, NULL, set_force_option, 0 },
+ { "update", 0, 0, &opt_update, NULL, NULL, 1 },
+ { NULL, 0 }
+};
+
+int
+main(int argc, const char *const *argv)
+{
+ int ret;
+
+ dpkg_locales_init(PACKAGE);
+ dpkg_program_init("dpkg-statoverride");
+ set_force_default(FORCE_STATCMD_MASK);
+ dpkg_options_parse(&argv, cmdinfos, printforhelp);
+
+ debug(dbg_general, "root=%s admindir=%s", dpkg_fsys_get_dir(), dpkg_db_get_dir());
+
+ if (!cipaction)
+ badusage(_("need an action option"));
+
+ ret = cipaction->action(argv);
+
+ dpkg_program_done();
+ dpkg_locales_done();
+
+ return ret;
+}
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