diff options
| -rw-r--r-- | loginutils/login.c | 73 |
1 files changed, 29 insertions, 44 deletions
diff --git a/loginutils/login.c b/loginutils/login.c index 78a2ba1..0157bac 100644 --- a/loginutils/login.c +++ b/loginutils/login.c @@ -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(); - - 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(); - } + opt = bb_getopt_ulflags(argc, argv, "f:h:p", &opt_user, &opt_host); + + 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()) @@ -306,14 +291,14 @@ int login_main(int argc, char **argv) /* Don't check the password if password entry is empty (!) */ if (!pw->pw_passwd[0]) - break; + break; /* authorization takes place here */ if (correct_password(pw)) - break; + 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 */ |