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login: apply fixes + getopt_ulflag'ification by Bernhard

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This commit is contained in:
Denis Vlasenko 2006-09-17 14:45:09 +00:00
parent 4d0f54af94
commit 66fabdb631
1 changed files with 28 additions and 43 deletions
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67
loginutils/login.c
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@ -40,7 +40,9 @@ static char* short_tty = full_tty;
* This means that getty should never invoke login with any
* command line flags.
*/
static struct utmp utent;
static void read_or_build_utent(int picky)
{
struct utmp *ut;
@ -97,10 +99,10 @@ static void write_utent(const char *username)
updwtmp(bb_path_wtmp_file, &utent);
#endif
}
#else /* !CONFIG_FEATURE_UTMP */
static inline void read_or_build_utent(int) {}
static inline void write_utent(const char *) {}
#endif /* !CONFIG_FEATURE_UTMP */
#else /* !ENABLE_FEATURE_UTMP */
static inline void read_or_build_utent(int ATTRIBUTE_UNUSED picky) {}
static inline void write_utent(const char ATTRIBUTE_UNUSED *username) {}
#endif /* !ENABLE_FEATURE_UTMP */
static void die_if_nologin_and_non_root(int amroot)
{
@ -211,53 +213,35 @@ static void alarm_handler(int sig ATTRIBUTE_UNUSED)
int login_main(int argc, char **argv)
{
enum {
LOGIN_OPT_f = (1<<0),
LOGIN_OPT_h = (1<<1),
LOGIN_OPT_p = (1<<2),
};
char fromhost[512];
char username[USERNAME_SIZE];
const char *tmp;
int amroot;
int flag;
unsigned long opt;
int count = 0;
struct passwd *pw;
int opt_preserve = 0;
int opt_fflag = 0;
char *opt_host = 0;
#ifdef CONFIG_SELINUX
security_context_t user_sid = NULL;
#endif
char *opt_host = NULL;
char *opt_user = NULL;
USE_SELINUX(security_context_t user_sid = NULL;)
username[0] = '\0';
amroot = (getuid() == 0);
signal(SIGALRM, alarm_handler);
alarm(TIMEOUT);
while ((flag = getopt(argc, argv, "f:h:p")) != EOF) {
switch (flag) {
case 'p':
opt_preserve = 1;
break;
case 'f':
/*
* username must be a separate token
* (-f root, *NOT* -froot). --marekm
*/
if (optarg != argv[optind-1])
bb_show_usage();
opt = bb_getopt_ulflags(argc, argv, "f:h:p", &opt_user, &opt_host);
if (!amroot) /* Auth bypass only if real UID is zero */
bb_error_msg_and_die("-f is for root only");
safe_strncpy(username, optarg, sizeof(username));
opt_fflag = 1;
break;
case 'h':
opt_host = optarg;
break;
default:
bb_show_usage();
}
if (opt & LOGIN_OPT_f) {
if (!amroot)
bb_error_msg_and_die("-f is for root only");
safe_strncpy(username, opt_user, strlen(opt_user));
}
if (optind < argc) /* user from command line (getty) */
safe_strncpy(username, argv[optind], sizeof(username));
username[USERNAME_SIZE] = 0;
/* Let's find out and memorize our tty */
if (!isatty(0) || !isatty(1) || !isatty(2))
@ -273,8 +257,9 @@ int login_main(int argc, char **argv)
read_or_build_utent(!amroot);
if (opt_host) {
if (ENABLE_FEATURE_UTMP)
USE_FEATURE_UTMP(
safe_strncpy(utent.ut_host, opt_host, sizeof(utent.ut_host));
)
snprintf(fromhost, sizeof(fromhost)-1, " on `%.100s' from "
"`%.200s'", short_tty, opt_host);
}
@ -298,7 +283,7 @@ int login_main(int argc, char **argv)
if (pw->pw_passwd[0] == '!' || pw->pw_passwd[0] == '*')
goto auth_failed;
if (opt_fflag)
if (opt & LOGIN_OPT_f)
break; /* -f USER: success without asking passwd */
if (pw->pw_uid == 0 && !check_securetty())
@ -313,7 +298,7 @@ int login_main(int argc, char **argv)
break;
auth_failed:
opt_fflag = 0;
opt &= ~LOGIN_OPT_f;
bb_do_delay(FAIL_DELAY);
puts("Login incorrect");
if (++count == 3) {
@ -382,7 +367,7 @@ auth_failed:
tmp = pw->pw_shell;
if (!tmp || !*tmp)
tmp = DEFAULT_SHELL;
setup_environment(tmp, 1, !opt_preserve, pw);
setup_environment(tmp, 1, !(opt & LOGIN_OPT_p), pw);
motd();
signal(SIGALRM, SIG_DFL); /* default alarm signal */