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sulogin: use common password-checking routine.

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This needed some extensions correct_passwd() function,
which got renamed ask_and_check_password() to better describe what it does.

function                                             old     new   delta
ask_and_check_password_extended                        -     215    +215
ask_and_check_password                                 -      12     +12
vlock_main                                           394     397      +3
sulogin_main                                         494     326    -168
correct_password                                     207       -    -207
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 1/1 up/down: 230/-375)         Total: -145 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2013-11-19 13:09:06 +01:00
parent f6beef63c6
commit 9c1c605b1a
6 changed files with 26 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
loginutils/sulogin.c
View File

@@ -14,24 +14,12 @@
#include "libbb.h"
#include <syslog.h>
//static void catchalarm(int UNUSED_PARAM junk)
//{
// exit(EXIT_FAILURE);
//}
int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sulogin_main(int argc UNUSED_PARAM, char **argv)
{
char *cp;
int timeout = 0;
struct passwd *pwd;
const char *shell;
#if ENABLE_FEATURE_SHADOWPASSWDS
/* Using _r function to avoid pulling in static buffers */
char buffer[256];
struct spwd spw;
#endif
logmode = LOGMODE_BOTH;
openlog(applet_name, 0, LOG_AUTH);
@@ -62,43 +50,24 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv)
goto auth_error;
}
#if ENABLE_FEATURE_SHADOWPASSWDS
{
/* getspnam_r may return 0 yet set result to NULL.
* At least glibc 2.4 does this. Be extra paranoid here. */
struct spwd *result = NULL;
int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
if (r || !result) {
goto auth_error;
}
pwd->pw_passwd = result->sp_pwdp;
}
#endif
while (1) {
char *encrypted;
int r;
/* cp points to a static buffer */
cp = bb_ask(STDIN_FILENO, timeout,
"Give root password for system maintenance\n"
"(or type Control-D for normal startup):");
if (!cp) {
r = ask_and_check_password_extended(pwd, timeout,
"Give root password for system maintenance\n"
"(or type Control-D for normal startup):"
);
if (r < 0) {
/* ^D, ^C, timeout, or read error */
bb_info_msg("Normal startup");
return 0;
}
encrypted = pw_encrypt(cp, pwd->pw_passwd, 1);
r = strcmp(encrypted, pwd->pw_passwd);
free(encrypted);
if (r == 0) {
if (r > 0) {
break;
}
bb_do_delay(LOGIN_FAIL_DELAY);
bb_info_msg("Login incorrect");
}
memset(cp, 0, strlen(cp));
// signal(SIGALRM, SIG_DFL);
bb_info_msg("System Maintenance Mode");