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lib/sub.c
68 строк
2 KB
Alejandro Colomar
lib/defines.h, lib/, src/: Redefine SYSLOG() as a variadic macro
26 фев 2026, 14:02
26 фев 2026, 14:02
25d44fc
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/* * SPDX-FileCopyrightText: 1989 - 1991, Julianne Frances Haugh * SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz * SPDX-FileCopyrightText: 2003 - 2006, Tomasz Kłoczko * * SPDX-License-Identifier: BSD-3-Clause */ #include "config.h" #ident "$Id$" #include <pwd.h> #include <stdio.h> #include <sys/types.h> #include "prototypes.h" #include "defines.h" #define MAX_SUBROOT2 "maximum subsystem depth reached\n" #define BAD_SUBROOT2 "invalid root `%s' for user `%s'\n" #define NO_SUBROOT2 "no subsystem root `%s' for user `%s'\n" #define MAX_DEPTH 1024 /* * subsystem - change to subsystem root * * A subsystem login is indicated by the presence of a "*" as * the first character of the login shell. The given home * directory will be used as the root of a new filesystem which * the user is actually logged into. */ void subsystem (const struct passwd *pw) { static int depth = 0; /* * Prevent endless loop on misconfigured systems. */ if (++depth > MAX_DEPTH) { printf (_("Maximum subsystem depth reached\n")); SYSLOG(LOG_WARN, MAX_SUBROOT2); closelog (); exit (EXIT_FAILURE); } /* * The new root directory must begin with a "/" character. */ if (pw->pw_dir[0] != '/') { printf (_("Invalid root directory '%s'\n"), pw->pw_dir); SYSLOG(LOG_WARN, BAD_SUBROOT2, pw->pw_dir, pw->pw_name); closelog (); exit (EXIT_FAILURE); } /* * The directory must be accessible and the current process * must be able to change into it. */ if ( (chroot (pw->pw_dir) != 0) || (chdir ("/") != 0)) { (void) printf (_("Can't change root directory to '%s'\n"), pw->pw_dir); SYSLOG(LOG_WARN, NO_SUBROOT2, pw->pw_dir, pw->pw_name); closelog (); exit (EXIT_FAILURE); } }