close(p[1]);
xdup2(p[0], STDIN_FILENO);
signal(SIGPIPE, SIG_DFL);
- execl("/bin/sh", "/bin/sh" + 5, "-c", archive_handle->tar__to_command, NULL);
- bb_perror_msg_and_die("can't execute '%s'", "/bin/sh");
+ execl(DEFAULT_SHELL, DEFAULT_SHELL_SHORT_NAME, "-c", archive_handle->tar__to_command, NULL);
+ bb_perror_msg_and_die("can't execute '%s'", DEFAULT_SHELL);
}
close(p[0]);
/* Our caller is expected to do signal(SIGPIPE, SIG_IGN)
extern void bb_do_delay(int seconds) FAST_FUNC;
extern void change_identity(const struct passwd *pw) FAST_FUNC;
extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) NORETURN FAST_FUNC;
-extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) FAST_FUNC;
#if ENABLE_SELINUX
extern void renew_current_security_context(void) FAST_FUNC;
extern void set_current_security_context(security_context_t sid) FAST_FUNC;
* use bb_default_login_shell and following defines.
* If you change LIBBB_DEFAULT_LOGIN_SHELL,
* don't forget to change increment constant. */
-#define LIBBB_DEFAULT_LOGIN_SHELL "-/bin/sh"
+#define LIBBB_DEFAULT_LOGIN_SHELL "-/bin/sh"
extern const char bb_default_login_shell[];
/* "/bin/sh" */
-#define DEFAULT_SHELL (bb_default_login_shell+1)
+#define DEFAULT_SHELL (bb_default_login_shell+1)
/* "sh" */
-#define DEFAULT_SHELL_SHORT_NAME (bb_default_login_shell+6)
+#define DEFAULT_SHELL_SHORT_NAME (bb_default_login_shell+6)
#if ENABLE_FEATURE_DEVFS
# define CURRENT_VC "/dev/vc/0"
#endif
-/* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
- If COMMAND is nonzero, pass it to the shell with the -c option.
- If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
- arguments. */
-
+/* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
+ * If COMMAND is nonzero, pass it to the shell with the -c option.
+ * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
+ * arguments. */
void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
{
const char **args;
- int argno = 1;
+ int argno;
int additional_args_cnt = 0;
for (args = additional_args; args && *args; args++)
args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));
- args[0] = bb_get_last_path_component_nostrip(xstrdup(shell));
+ if (!shell || !shell[0])
+ shell = DEFAULT_SHELL;
+ args[0] = bb_get_last_path_component_nostrip(shell);
if (loginshell)
args[0] = xasprintf("-%s", args[0]);
-
+ argno = 1;
if (command) {
args[argno++] = "-c";
args[argno++] = command;
args[argno++] = *additional_args;
}
args[argno] = NULL;
+
#if ENABLE_SELINUX
if (current_sid)
setexeccon(current_sid);
const char *term;
/* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
- Unset all other environment variables. */
+ * Unset all other environment variables. */
term = getenv("TERM");
clearenv();
if (term)
//xsetenv("SHELL", shell);
} else if (flags & SETUP_ENV_CHANGEENV) {
/* Set HOME, SHELL, and if not becoming a super-user,
- USER and LOGNAME. */
+ * USER and LOGNAME. */
if (pw->pw_uid) {
shortcut:
xsetenv("USER", pw->pw_name);
};
char *fromhost;
char username[USERNAME_SIZE];
- const char *tmp;
+ const char *shell;
int run_by_root;
unsigned opt;
int count = 0;
run_login_script(pw, full_tty);
change_identity(pw);
- tmp = pw->pw_shell;
- if (!tmp || !*tmp)
- tmp = DEFAULT_SHELL;
- setup_environment(tmp,
+ shell = pw->pw_shell;
+ if (!shell || !shell[0])
+ shell = DEFAULT_SHELL;
+ setup_environment(shell,
(!(opt & LOGIN_OPT_p) * SETUP_ENV_CLEARENV) + SETUP_ENV_CHANGEENV,
pw);
signal(SIGINT, SIG_DFL);
/* Exec login shell with no additional parameters */
- run_shell(tmp, 1, NULL, NULL);
+ run_shell(shell, 1, NULL, NULL);
/* return EXIT_FAILURE; - not reached */
}
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
/* Return 1 if SHELL is a restricted shell (one not returned by
- getusershell), else 0, meaning it is a standard shell. */
+ * getusershell), else 0, meaning it is a standard shell. */
static int restricted_shell(const char *shell)
{
char *line;
+ int result = 1;
/*setusershell(); - getusershell does it itself*/
while ((line = getusershell()) != NULL) {
- if (/* *line != '#' && */ strcmp(line, shell) == 0)
- return 0;
+ if (/* *line != '#' && */ strcmp(line, shell) == 0) {
+ result = 0;
+ break;
+ }
}
- endusershell();
- return 1;
+ if (ENABLE_FEATURE_CLEAN_UP)
+ endusershell();
+ return result;
}
#endif
#define SU_OPT_mp (3)
-#define SU_OPT_l (4)
+#define SU_OPT_l (4)
int su_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int su_main(int argc UNUSED_PARAM, char **argv)
struct passwd *pw;
uid_t cur_uid = getuid();
const char *tty;
- char *old_user;
+ char user_buf[64];
+ const char *old_user;
flags = getopt32(argv, "mplc:s:", &opt_command, &opt_shell);
//argc -= optind;
}
if (ENABLE_FEATURE_SU_SYSLOG) {
- /* The utmp entry (via getlogin) is probably the best way to identify
- * the user, especially if someone su's from a su-shell.
+ /* The utmp entry (via getlogin) is probably the best way to
+ * identify the user, especially if someone su's from a su-shell.
* But getlogin can fail -- usually due to lack of utmp entry.
* in this case resort to getpwuid. */
- const char *user;
#if ENABLE_FEATURE_UTMP
- char user_buf[64];
- user = user_buf;
+ old_user = user_buf;
if (getlogin_r(user_buf, sizeof(user_buf)) != 0)
#endif
{
pw = getpwuid(cur_uid);
- user = pw ? pw->pw_name : "";
+ old_user = pw ? xstrdup(pw->pw_name) : "";
}
- old_user = xstrdup(user);
tty = xmalloc_ttyname(2);
if (!tty) {
tty = "none";
pw = xgetpwnam(opt_username);
- /* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
- is a username that is retrieved via NIS (YP), but that doesn't have
- a default shell listed. */
- if (!pw->pw_shell || !pw->pw_shell[0])
- pw->pw_shell = (char *)DEFAULT_SHELL;
-
- if ((cur_uid == 0) || correct_password(pw)) {
+ if (cur_uid == 0 || correct_password(pw)) {
if (ENABLE_FEATURE_SU_SYSLOG)
syslog(LOG_NOTICE, "%c %s %s:%s",
'+', tty, old_user, opt_username);
if (ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_SU_SYSLOG) {
closelog();
- free(old_user);
}
- if (!opt_shell && (flags & SU_OPT_mp))
+ if (!opt_shell && (flags & SU_OPT_mp)) {
+ /* -s SHELL is not given, but "preserve env" opt is */
opt_shell = getenv("SHELL");
+ }
+
+ /* Make sure pw->pw_shell is non-NULL. It may be NULL when NEW_USER
+ * is a username that is retrieved via NIS (YP), that doesn't have
+ * a default shell listed. */
+ if (!pw->pw_shell || !pw->pw_shell[0])
+ pw->pw_shell = (char *)DEFAULT_SHELL;
#if ENABLE_FEATURE_SU_CHECKS_SHELLS
if (opt_shell && cur_uid != 0 && restricted_shell(pw->pw_shell)) {
/* The user being su'd to has a nonstandard shell, and so is
- probably a uucp account or has restricted access. Don't
- compromise the account by allowing access with a standard
- shell. */
+ * probably a uucp account or has restricted access. Don't
+ * compromise the account by allowing access with a standard
+ * shell. */
bb_error_msg("using restricted shell");
opt_shell = NULL;
}
+ /* else: user can run whatever he wants via "su -s PROG USER".
+ * This is safe since PROG is run under user's uid/gid. */
#endif
if (!opt_shell)
opt_shell = pw->pw_shell;
shell = getenv("SUSHELL");
if (!shell)
shell = getenv("sushell");
- if (!shell) {
- shell = "/bin/sh";
- if (pwd->pw_shell[0])
- shell = pwd->pw_shell;
- }
+ if (!shell)
+ shell = pwd->pw_shell;
+
/* Exec login shell with no additional parameters. Never returns. */
run_shell(shell, 1, NULL, NULL);
xmove_fd(fd, 5);
// getenv("SHELL")?
- execl("/bin/sh", "/bin/sh" + 5, "-c", ld->processor, (char*) NULL);
+ execl(DEFAULT_SHELL, DEFAULT_SHELL_SHORT_NAME, "-c", ld->processor, (char*) NULL);
bb_perror_msg_and_die(FATAL"can't %s processor %s", "run", ld->name);
}
ld->fnsave[26] = sv_ch; /* ...restore */
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