aboutsummaryrefslogtreecommitdiff
path: root/loginutils
diff options
context:
space:
mode:
Diffstat (limited to 'loginutils')
-rw-r--r--loginutils/login.c264
1 files changed, 133 insertions, 131 deletions
diff --git a/loginutils/login.c b/loginutils/login.c
index 39d980fa8..82be87eb3 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -35,31 +35,31 @@ static void setutmp(const char *name, const char *line);
static struct utmp utent;
#endif
-// login defines
-#define TIMEOUT 60
-#define EMPTY_USERNAME_COUNT 10
-#define USERNAME_SIZE 32
+enum {
+ TIMEOUT = 60,
+ EMPTY_USERNAME_COUNT = 10,
+ USERNAME_SIZE = 32,
+};
-
-static int check_nologin ( int amroot );
+static int check_nologin(int amroot);
#if defined CONFIG_FEATURE_SECURETTY
-static int check_tty ( const char *tty );
+static int check_tty(const char *tty);
#else
-static inline int check_tty ( const char *tty ) { return 1; }
+static inline int check_tty(const char *tty) { return 1; }
#endif
-static int is_my_tty ( const char *tty );
-static int login_prompt ( char *buf_name );
-static void motd ( void );
+static int is_my_tty(const char *tty);
+static int login_prompt(char *buf_name);
+static void motd(void);
-static void alarm_handler ( int sig ATTRIBUTE_UNUSED)
+static void alarm_handler(int sig ATTRIBUTE_UNUSED)
{
- fprintf (stderr, "\nLogin timed out after %d seconds.\n", TIMEOUT );
- exit ( EXIT_SUCCESS );
+ fprintf(stderr, "\nLogin timed out after %d seconds.\n", TIMEOUT);
+ exit(EXIT_SUCCESS);
}
@@ -73,7 +73,7 @@ int login_main(int argc, char **argv)
int amroot;
int flag;
int failed;
- int count=0;
+ int count = 0;
struct passwd *pw, pw_copy;
#ifdef CONFIG_WHEEL_GROUP
struct group *grp;
@@ -86,14 +86,14 @@ int login_main(int argc, char **argv)
security_context_t user_sid = NULL;
#endif
- username[0]=0;
- amroot = ( getuid ( ) == 0 );
- signal ( SIGALRM, alarm_handler );
- alarm ( TIMEOUT );
+ username[0] = '\0';
+ amroot = (getuid() == 0);
+ signal(SIGALRM, alarm_handler);
+ alarm(TIMEOUT);
alarmstarted = 1;
- while (( flag = getopt(argc, argv, "f:h:p")) != EOF ) {
- switch ( flag ) {
+ while ((flag = getopt(argc, argv, "f:h:p")) != EOF) {
+ switch (flag) {
case 'p':
opt_preserve = 1;
break;
@@ -102,11 +102,11 @@ int login_main(int argc, char **argv)
* username must be a separate token
* (-f root, *NOT* -froot). --marekm
*/
- if ( optarg != argv[optind-1] )
- bb_show_usage( );
+ if (optarg != argv[optind-1])
+ bb_show_usage();
- if ( !amroot ) /* Auth bypass only if real UID is zero */
- bb_error_msg_and_die ( "-f permission denied" );
+ if (!amroot) /* Auth bypass only if real UID is zero */
+ bb_error_msg_and_die("-f permission denied");
safe_strncpy(username, optarg, USERNAME_SIZE);
opt_fflag = 1;
@@ -115,59 +115,60 @@ int login_main(int argc, char **argv)
opt_host = optarg;
break;
default:
- bb_show_usage( );
+ bb_show_usage();
}
}
- if (optind < argc) // user from command line (getty)
+ if (optind < argc) /* user from command line (getty) */
safe_strncpy(username, argv[optind], USERNAME_SIZE);
- if ( !isatty ( 0 ) || !isatty ( 1 ) || !isatty ( 2 ))
+ if (!isatty(0) || !isatty(1) || !isatty(2))
return EXIT_FAILURE; /* Must be a terminal */
#ifdef CONFIG_FEATURE_UTMP
- checkutmp ( !amroot );
+ checkutmp(!amroot);
#endif
- tmp = ttyname ( 0 );
- if ( tmp && ( strncmp ( tmp, "/dev/", 5 ) == 0 ))
- safe_strncpy ( tty, tmp + 5, sizeof( tty ));
- else if ( tmp && *tmp == '/' )
- safe_strncpy ( tty, tmp, sizeof( tty ));
+ tmp = ttyname(0);
+ if (tmp && (strncmp(tmp, "/dev/", 5) == 0))
+ safe_strncpy(tty, tmp + 5, sizeof(tty));
+ else if (tmp && *tmp == '/')
+ safe_strncpy(tty, tmp, sizeof(tty));
else
- safe_strncpy ( tty, "UNKNOWN", sizeof( tty ));
+ safe_strncpy(tty, "UNKNOWN", sizeof(tty));
#ifdef CONFIG_FEATURE_UTMP
- if ( amroot )
- memset ( utent.ut_host, 0, sizeof utent.ut_host );
+ if (amroot)
+ memset(utent.ut_host, 0, sizeof(utent.ut_host));
#endif
- if ( opt_host ) {
+ if (opt_host) {
#ifdef CONFIG_FEATURE_UTMP
- safe_strncpy ( utent.ut_host, opt_host, sizeof( utent. ut_host ));
+ safe_strncpy(utent.ut_host, opt_host, sizeof(utent.ut_host));
#endif
- snprintf ( fromhost, sizeof( fromhost ) - 1, " on `%.100s' from `%.200s'", tty, opt_host );
+ snprintf(fromhost, sizeof(fromhost)-1, " on `%.100s' from `%.200s'", tty, opt_host);
}
else
- snprintf ( fromhost, sizeof( fromhost ) - 1, " on `%.100s'", tty );
+ snprintf(fromhost, sizeof(fromhost)-1, " on `%.100s'", tty);
bb_setpgrp;
- openlog ( "login", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH );
+ openlog("login", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
- while ( 1 ) {
+ while (1) {
failed = 0;
- if ( !username[0] )
- if(!login_prompt ( username ))
+ if (!username[0])
+ if (!login_prompt(username))
return EXIT_FAILURE;
- if ( !alarmstarted && ( TIMEOUT > 0 )) {
- alarm ( TIMEOUT );
+ if (!alarmstarted && (TIMEOUT > 0)) {
+ alarm(TIMEOUT);
alarmstarted = 1;
}
- if (!( pw = getpwnam ( username ))) {
+ pw = getpwnam(username);
+ if (!pw) {
pw_copy.pw_name = "UNKNOWN";
pw_copy.pw_passwd = "!";
opt_fflag = 0;
@@ -177,93 +178,92 @@ int login_main(int argc, char **argv)
pw = &pw_copy;
- if (( pw-> pw_passwd [0] == '!' ) || ( pw-> pw_passwd[0] == '*' ))
+ if ((pw->pw_passwd[0] == '!') || (pw->pw_passwd[0] == '*'))
failed = 1;
- if ( opt_fflag ) {
+ if (opt_fflag) {
opt_fflag = 0;
goto auth_ok;
}
- if (!failed && ( pw-> pw_uid == 0 ) && ( !check_tty ( tty )))
+ if (!failed && (pw->pw_uid == 0) && (!check_tty(tty)))
failed = 1;
/* Don't check the password if password entry is empty (!) */
- if ( !pw-> pw_passwd[0] )
+ if (!pw->pw_passwd[0])
goto auth_ok;
/* authorization takes place here */
- if ( correct_password ( pw ))
+ if (correct_password(pw))
goto auth_ok;
failed = 1;
auth_ok:
- if ( !failed)
+ if (!failed)
break;
bb_do_delay(FAIL_DELAY);
puts("Login incorrect");
username[0] = 0;
- if ( ++count == 3 ) {
- syslog ( LOG_WARNING, "invalid password for `%s'%s\n", pw->pw_name, fromhost);
+ if (++count == 3) {
+ syslog(LOG_WARNING, "invalid password for `%s'%s'\n", pw->pw_name, fromhost);
return EXIT_FAILURE;
- }
+ }
}
- alarm ( 0 );
- if ( check_nologin ( pw-> pw_uid == 0 ))
+ alarm(0);
+ if (check_nologin(pw->pw_uid == 0))
return EXIT_FAILURE;
#ifdef CONFIG_FEATURE_UTMP
- setutmp ( username, tty );
+ setutmp(username, tty);
#endif
- if ( *tty != '/' )
- snprintf ( full_tty, sizeof( full_tty ) - 1, "/dev/%s", tty);
+ if (*tty != '/')
+ snprintf(full_tty, sizeof(full_tty)-1, "/dev/%s", tty);
else
- safe_strncpy ( full_tty, tty, sizeof( full_tty ) - 1 );
+ safe_strncpy(full_tty, tty, sizeof(full_tty)-1);
#ifdef CONFIG_SELINUX
- if (is_selinux_enabled())
- {
+ if (is_selinux_enabled()) {
security_context_t old_tty_sid, new_tty_sid;
- if (get_default_context(username, NULL, &user_sid))
- {
+ if (get_default_context(username, NULL, &user_sid)) {
fprintf(stderr, "Unable to get SID for %s\n", username);
exit(1);
}
- if (getfilecon(full_tty, &old_tty_sid) < 0)
- {
- fprintf(stderr, "getfilecon(%.100s) failed: %.100s\n", full_tty, strerror(errno));
+ if (getfilecon(full_tty, &old_tty_sid) < 0) {
+ fprintf(stderr, "getfilecon(%.100s) failed: "
+ "%.100s\n", full_tty, strerror(errno));
return EXIT_FAILURE;
}
- if (security_compute_relabel(user_sid, old_tty_sid, SECCLASS_CHR_FILE, &new_tty_sid) != 0)
- {
- fprintf(stderr, "security_change_sid(%.100s) failed: %.100s\n", full_tty, strerror(errno));
+ if (security_compute_relabel(user_sid, old_tty_sid, SECCLASS_CHR_FILE,
+ &new_tty_sid) != 0) {
+ fprintf(stderr, "security_change_sid(%.100s) failed: "
+ "%.100s\n", full_tty, strerror(errno));
return EXIT_FAILURE;
}
- if(setfilecon(full_tty, new_tty_sid) != 0)
- {
- fprintf(stderr, "chsid(%.100s, %s) failed: %.100s\n", full_tty, new_tty_sid, strerror(errno));
+ if (setfilecon(full_tty, new_tty_sid) != 0) {
+ fprintf(stderr, "chsid(%.100s, %s) failed: "
+ "%.100s\n", full_tty, new_tty_sid, strerror(errno));
return EXIT_FAILURE;
}
}
#endif
- if ( !is_my_tty ( full_tty ))
- syslog ( LOG_ERR, "unable to determine TTY name, got %s\n", full_tty );
+ if (!is_my_tty(full_tty))
+ syslog(LOG_ERR, "unable to determine TTY name, got %s\n", full_tty);
/* Try these, but don't complain if they fail
* (for example when the root fs is read only) */
- chown ( full_tty, pw-> pw_uid, pw-> pw_gid );
- chmod ( full_tty, 0600 );
+ chown(full_tty, pw->pw_uid, pw->pw_gid);
+ chmod(full_tty, 0600);
if (ENABLE_LOGIN_SCRIPTS) {
char *script = getenv("LOGIN_PRE_SUID_SCRIPT");
if (script) {
char *t_argv[2] = { script, NULL };
- switch(fork()) {
+ switch (fork()) {
case -1: break;
case 0: /* child */
xchdir("/");
@@ -280,99 +280,100 @@ auth_ok:
}
}
- change_identity ( pw );
- tmp = pw-> pw_shell;
- if(!tmp || !*tmp)
+ change_identity(pw);
+ tmp = pw->pw_shell;
+ if (!tmp || !*tmp)
tmp = DEFAULT_SHELL;
- setup_environment ( tmp, 1, !opt_preserve, pw );
+ setup_environment(tmp, 1, !opt_preserve, pw);
- motd ( );
- signal ( SIGALRM, SIG_DFL ); /* default alarm signal */
+ motd();
+ signal(SIGALRM, SIG_DFL); /* default alarm signal */
- if ( pw-> pw_uid == 0 )
- syslog ( LOG_INFO, "root login %s\n", fromhost );
+ if (pw->pw_uid == 0)
+ syslog(LOG_INFO, "root login %s\n", fromhost);
#ifdef CONFIG_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);
#endif
- run_shell ( tmp, 1, 0, 0); /* exec the shell finally. */
+ run_shell(tmp, 1, 0, 0); /* exec the shell finally. */
return EXIT_FAILURE;
}
-
-static int login_prompt ( char *buf_name )
+static int login_prompt(char *buf_name)
{
- char buf [1024];
+ char buf[1024];
char *sp, *ep;
int i;
- for(i=0; i<EMPTY_USERNAME_COUNT; i++) {
+ for (i=0; i<EMPTY_USERNAME_COUNT; i++) {
print_login_prompt();
- if ( !fgets ( buf, sizeof( buf ) - 1, stdin ))
+ if (!fgets(buf, sizeof(buf)-1, stdin))
return 0;
- if ( !strchr ( buf, '\n' ))
+ if (!strchr(buf, '\n'))
return 0;
- for ( sp = buf; isspace ( *sp ); sp++ ) { }
- for ( ep = sp; isgraph ( *ep ); ep++ ) { }
+ for (sp = buf; isspace(*sp); sp++) { }
+ for (ep = sp; isgraph(*ep); ep++) { }
- *ep = 0;
+ *ep = '\0';
safe_strncpy(buf_name, sp, USERNAME_SIZE);
- if(buf_name[0])
+ if (buf_name[0])
return 1;
}
return 0;
}
-static int check_nologin ( int amroot )
+static int check_nologin(int amroot)
{
- if ( access ( bb_path_nologin_file, F_OK ) == 0 ) {
+ if (access(bb_path_nologin_file, F_OK) == 0) {
FILE *fp;
int c;
- if (( fp = fopen ( bb_path_nologin_file, "r" ))) {
- while (( c = getc ( fp )) != EOF )
- putchar (( c == '\n' ) ? '\r' : c );
+ fp = fopen(bb_path_nologin_file, "r");
+ if (fp) {
+ while ((c = getc(fp)) != EOF)
+ putchar((c=='\n') ? '\r' : c);
- fflush ( stdout );
- fclose ( fp );
+ fflush(stdout);
+ fclose(fp);
} else {
- puts ( "\r\nSystem closed for routine maintenance.\r" );
+ puts("\r\nSystem closed for routine maintenance.\r");
}
- if ( !amroot )
+ if (!amroot)
return 1;
- puts ( "\r\n[Disconnect bypassed -- root login allowed.]\r" );
+ puts("\r\n[Disconnect bypassed -- root login allowed.]\r");
}
return 0;
}
#ifdef CONFIG_FEATURE_SECURETTY
-static int check_tty ( const char *tty )
+static int check_tty(const char *tty)
{
FILE *fp;
int i;
char buf[BUFSIZ];
- if (( fp = fopen ( bb_path_securetty_file, "r" ))) {
- while ( fgets ( buf, sizeof( buf ) - 1, fp )) {
- for ( i = strlen( buf ) - 1; i >= 0; --i ) {
- if ( !isspace ( buf[i] ))
+ fp = fopen(bb_path_securetty_file, "r");
+ if (fp) {
+ while (fgets(buf, sizeof(buf)-1, fp)) {
+ 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]=='\0') || (buf[0]=='#'))
continue;
- if ( strcmp ( buf, tty ) == 0 ) {
- fclose ( fp );
+ if (strcmp(buf, tty)== 0) {
+ fclose(fp);
return 1;
}
}
@@ -386,29 +387,30 @@ static int check_tty ( const char *tty )
#endif
/* returns 1 if true */
-static int is_my_tty ( const char *tty )
+static int is_my_tty(const char *tty)
{
struct stat by_name, by_fd;
- if ( stat ( tty, &by_name ) || fstat ( 0, &by_fd ))
+ if (stat(tty, &by_name) || fstat(0, &by_fd))
return 0;
- if ( by_name. st_rdev != by_fd. st_rdev )
+ if (by_name.st_rdev != by_fd.st_rdev)
return 0;
else
return 1;
}
-static void motd (void)
+static void motd(void)
{
FILE *fp;
int c;
- if (( fp = fopen ( bb_path_motd_file, "r" ))) {
- while (( c = getc ( fp )) != EOF )
- putchar ( c );
- fclose ( fp );
+ fp = fopen(bb_path_motd_file, "r");
+ if (fp) {
+ while ((c = getc(fp)) != EOF)
+ putchar(c);
+ fclose(fp);
}
}
@@ -466,13 +468,13 @@ static void checkutmp(int picky)
}
if (strncmp(line, "/dev/", 5) == 0)
line += 5;
- memset(&utent, 0, sizeof utent);
+ memset(&utent, 0, sizeof(utent));
utent.ut_type = LOGIN_PROCESS;
utent.ut_pid = pid;
- strncpy(utent.ut_line, line, sizeof utent.ut_line);
+ strncpy(utent.ut_line, line, sizeof(utent.ut_line));
/* XXX - assumes /dev/tty?? */
- strncpy(utent.ut_id, utent.ut_line + 3, sizeof utent.ut_id);
- strncpy(utent.ut_user, "LOGIN", sizeof utent.ut_user);
+ strncpy(utent.ut_id, utent.ut_line + 3, sizeof(utent.ut_id));
+ strncpy(utent.ut_user, "LOGIN", sizeof(utent.ut_user));
t_tmp = (time_t)utent.ut_time;
time(&t_tmp);
}
@@ -490,7 +492,7 @@ static void setutmp(const char *name, const char *line ATTRIBUTE_UNUSED)
time_t t_tmp = (time_t)utent.ut_time;
utent.ut_type = USER_PROCESS;
- strncpy(utent.ut_user, name, sizeof utent.ut_user);
+ strncpy(utent.ut_user, name, sizeof(utent.ut_user));
time(&t_tmp);
/* other fields already filled in by checkutmp above */
setutent();
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 18:32:08 +0000