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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_hexdigits_upcase[];
extern const char bb_path_mtab_file[]; 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_passwd_file[];
extern const char bb_path_shadow_file[]; extern const char bb_path_shadow_file[];
extern const char bb_path_gshadow_file[]; extern const char bb_path_gshadow_file[];
extern const char bb_path_group_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_motd_file[];
extern const char bb_path_wtmp_file[]; extern const char bb_path_wtmp_file[];
extern const char bb_dev_null[]; extern const char bb_dev_null[];

2
libbb/messages.c
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@ -34,8 +34,6 @@ const char bb_path_passwd_file[] = "/etc/passwd";
const char bb_path_shadow_file[] = "/etc/shadow"; const char bb_path_shadow_file[] = "/etc/shadow";
const char bb_path_group_file[] = "/etc/group"; const char bb_path_group_file[] = "/etc/group";
const char bb_path_gshadow_file[] = "/etc/gshadow"; 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_path_motd_file[] = "/etc/motd";
const char bb_dev_null[] = "/dev/null"; const char bb_dev_null[] = "/dev/null";
const char bb_busybox_exec_path[] = CONFIG_BUSYBOX_EXEC_PATH; const char bb_busybox_exec_path[] = CONFIG_BUSYBOX_EXEC_PATH;

8
loginutils/Config.in
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@ -136,6 +136,14 @@ config LOGIN_SCRIPTS
Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT
just prior to switching from root to logged-in user. 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 config FEATURE_SECURETTY
bool "Support for /etc/securetty" bool "Support for /etc/securetty"
default y default y

22
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) #define write_utent(utptr, username) ((void)0)
#endif /* !ENABLE_FEATURE_UTMP */ #endif /* !ENABLE_FEATURE_UTMP */
#if ENABLE_FEATURE_NOLOGIN
static void die_if_nologin_and_non_root(int amroot) static void die_if_nologin_and_non_root(int amroot)
{ {
FILE *fp; FILE *fp;
int c; int c;
if (access(bb_path_nologin_file, F_OK)) if (access("/etc/nologin", F_OK))
return; return;
fp = fopen(bb_path_nologin_file, "r"); fp = fopen("/etc/nologin", "r");
if (fp) { if (fp) {
while ((c = getc(fp)) != EOF) while ((c = getc(fp)) != EOF)
putchar((c=='\n') ? '\r' : c); putchar((c=='\n') ? '\r' : c);
@ -118,17 +119,20 @@ static void die_if_nologin_and_non_root(int amroot)
puts("\r\nSystem closed for routine maintenance\r"); puts("\r\nSystem closed for routine maintenance\r");
if (!amroot) if (!amroot)
exit(1); 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 #if ENABLE_FEATURE_SECURETTY
static int check_securetty(void) static int check_securetty(void)
{ {
FILE *fp; FILE *fp;
int i; int i;
char buf[BUFSIZ]; char buf[256];
fp = fopen(bb_path_securetty_file, "r"); fp = fopen("/etc/securetty", "r");
if (!fp) { if (!fp) {
/* A missing securetty file is not an error. */ /* A missing securetty file is not an error. */
return 1; return 1;
@ -139,7 +143,7 @@ static int check_securetty(void)
break; break;
} }
buf[++i] = '\0'; buf[++i] = '\0';
if ((buf[0]=='\0') || (buf[0]=='#')) if (!buf[0] || (buf[0] == '#'))
continue; continue;
if (strcmp(buf, short_tty) == 0) { if (strcmp(buf, short_tty) == 0) {
fclose(fp); fclose(fp);
@ -150,7 +154,7 @@ static int check_securetty(void)
return 0; return 0;
} }
#else #else
static inline int check_securetty(void) { return 1; } static ALWAYS_INLINE int check_securetty(void) { return 1; }
#endif #endif
static void get_username_or_die(char *buf, int size_buf) 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); write_utent(&utent, username);
#ifdef CONFIG_SELINUX #if ENABLE_SELINUX
if (is_selinux_enabled()) { if (is_selinux_enabled()) {
security_context_t old_tty_sid, new_tty_sid; 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) if (pw->pw_uid == 0)
syslog(LOG_INFO, "root login%s", fromhost); syslog(LOG_INFO, "root login%s", fromhost);
#ifdef CONFIG_SELINUX #if ENABLE_SELINUX
/* well, a simple setexeccon() here would do the job as well, /* well, a simple setexeccon() here would do the job as well,
* but let's play the game for now */ * but let's play the game for now */
set_current_security_context(user_sid); set_current_security_context(user_sid);