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login: make /etc/nologin support configurable. -240 bytes if not selected.

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This commit is contained in:
Denis Vlasenko 2007-06-12 22:04:57 +00:00
parent 637c975098
commit f312e32662
4 changed files with 23 additions and 15 deletions
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2
include/libbb.h
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@ -943,12 +943,10 @@ extern const char bb_str_default[];
extern const char bb_hexdigits_upcase[];
extern const char bb_path_mtab_file[];
extern const char bb_path_nologin_file[];
extern const char bb_path_passwd_file[];
extern const char bb_path_shadow_file[];
extern const char bb_path_gshadow_file[];
extern const char bb_path_group_file[];
extern const char bb_path_securetty_file[];
extern const char bb_path_motd_file[];
extern const char bb_path_wtmp_file[];
extern const char bb_dev_null[];

2
libbb/messages.c
View File

@ -34,8 +34,6 @@ const char bb_path_passwd_file[] = "/etc/passwd";
const char bb_path_shadow_file[] = "/etc/shadow";
const char bb_path_group_file[] = "/etc/group";
const char bb_path_gshadow_file[] = "/etc/gshadow";
const char bb_path_nologin_file[] = "/etc/nologin";
const char bb_path_securetty_file[] = "/etc/securetty";
const char bb_path_motd_file[] = "/etc/motd";
const char bb_dev_null[] = "/dev/null";
const char bb_busybox_exec_path[] = CONFIG_BUSYBOX_EXEC_PATH;

10
loginutils/Config.in
View File

@ -136,12 +136,20 @@ config LOGIN_SCRIPTS
Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT
just prior to switching from root to logged-in user.
config FEATURE_NOLOGIN
bool "Support for /etc/nologin"
default y
depends on LOGIN
help
The file /etc/nologin is used by (some versions of) login(1).
If it exists, non-root logins are prohibited.
config FEATURE_SECURETTY
bool "Support for /etc/securetty"
default y
depends on LOGIN
help
The file /etc/securetty is used by (some versions of) login(1).
The file /etc/securetty is used by (some versions of) login(1).
The file contains the device names of tty lines (one per line,
without leading /dev/) on which root is allowed to login.

24
loginutils/login.c
View File

@ -100,15 +100,16 @@ static void write_utent(struct utmp *utptr, const char *username)
#define write_utent(utptr, username) ((void)0)
#endif /* !ENABLE_FEATURE_UTMP */
#if ENABLE_FEATURE_NOLOGIN
static void die_if_nologin_and_non_root(int amroot)
{
FILE *fp;
int c;
if (access(bb_path_nologin_file, F_OK))
if (access("/etc/nologin", F_OK))
return;
fp = fopen(bb_path_nologin_file, "r");
fp = fopen("/etc/nologin", "r");
if (fp) {
while ((c = getc(fp)) != EOF)
putchar((c=='\n') ? '\r' : c);
@ -118,28 +119,31 @@ static void die_if_nologin_and_non_root(int amroot)
puts("\r\nSystem closed for routine maintenance\r");
if (!amroot)
exit(1);
puts("\r\n[Disconnect bypassed -- root login allowed.]\r");
puts("\r\n[Disconnect bypassed -- root login allowed]\r");
}
#else
static ALWAYS_INLINE void die_if_nologin_and_non_root(int amroot) {}
#endif
#if ENABLE_FEATURE_SECURETTY
static int check_securetty(void)
{
FILE *fp;
int i;
char buf[BUFSIZ];
char buf[256];
fp = fopen(bb_path_securetty_file, "r");
fp = fopen("/etc/securetty", "r");
if (!fp) {
/* A missing securetty file is not an error. */
return 1;
}
while (fgets(buf, sizeof(buf)-1, fp)) {
for (i = strlen(buf)-1; i>=0; --i) {
for (i = strlen(buf)-1; i >= 0; --i) {
if (!isspace(buf[i]))
break;
}
buf[++i] = '\0';
if ((buf[0]=='\0') || (buf[0]=='#'))
if (!buf[0] || (buf[0] == '#'))
continue;
if (strcmp(buf, short_tty) == 0) {
fclose(fp);
@ -150,7 +154,7 @@ static int check_securetty(void)
return 0;
}
#else
static inline int check_securetty(void) { return 1; }
static ALWAYS_INLINE int check_securetty(void) { return 1; }
#endif
static void get_username_or_die(char *buf, int size_buf)
@ -313,7 +317,7 @@ int login_main(int argc, char **argv)
write_utent(&utent, username);
#ifdef CONFIG_SELINUX
#if ENABLE_SELINUX
if (is_selinux_enabled()) {
security_context_t old_tty_sid, new_tty_sid;
@ -368,7 +372,7 @@ int login_main(int argc, char **argv)
if (pw->pw_uid == 0)
syslog(LOG_INFO, "root login%s", fromhost);
#ifdef CONFIG_SELINUX
#if ENABLE_SELINUX
/* well, a simple setexeccon() here would do the job as well,
* but let's play the game for now */
set_current_security_context(user_sid);