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login: previous commit comment was wrong :)

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That commit added login script support.
Now _this commit_ is a style fix. Sorry....
This commit is contained in:
Denis Vlasenko 2006-09-08 17:25:04 +00:00
parent 2e502914b0
commit 942e4291fe
1 changed files with 133 additions and 131 deletions
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264
loginutils/login.c
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@ -35,31 +35,31 @@ static void setutmp(const char *name, const char *line);
static struct utmp utent; static struct utmp utent;
#endif #endif
// login defines enum {
#define TIMEOUT 60 TIMEOUT = 60,
#define EMPTY_USERNAME_COUNT 10 EMPTY_USERNAME_COUNT = 10,
#define USERNAME_SIZE 32 USERNAME_SIZE = 32,
};
static int check_nologin(int amroot);
static int check_nologin ( int amroot );
#if defined CONFIG_FEATURE_SECURETTY #if defined CONFIG_FEATURE_SECURETTY
static int check_tty ( const char *tty ); static int check_tty(const char *tty);
#else #else
static inline int check_tty ( const char *tty ) { return 1; } static inline int check_tty(const char *tty) { return 1; }
#endif #endif
static int is_my_tty ( const char *tty ); static int is_my_tty(const char *tty);
static int login_prompt ( char *buf_name ); static int login_prompt(char *buf_name);
static void motd ( void ); 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 ); fprintf(stderr, "\nLogin timed out after %d seconds.\n", TIMEOUT);
exit ( EXIT_SUCCESS ); exit(EXIT_SUCCESS);
} }
@ -73,7 +73,7 @@ int login_main(int argc, char **argv)
int amroot; int amroot;
int flag; int flag;
int failed; int failed;
int count=0; int count = 0;
struct passwd *pw, pw_copy; struct passwd *pw, pw_copy;
#ifdef CONFIG_WHEEL_GROUP #ifdef CONFIG_WHEEL_GROUP
struct group *grp; struct group *grp;
@ -86,14 +86,14 @@ int login_main(int argc, char **argv)
security_context_t user_sid = NULL; security_context_t user_sid = NULL;
#endif #endif
username[0]=0; username[0] = '\0';
amroot = ( getuid ( ) == 0 ); amroot = (getuid() == 0);
signal ( SIGALRM, alarm_handler ); signal(SIGALRM, alarm_handler);
alarm ( TIMEOUT ); alarm(TIMEOUT);
alarmstarted = 1; alarmstarted = 1;
while (( flag = getopt(argc, argv, "f:h:p")) != EOF ) { while ((flag = getopt(argc, argv, "f:h:p")) != EOF) {
switch ( flag ) { switch (flag) {
case 'p': case 'p':
opt_preserve = 1; opt_preserve = 1;
break; break;
@ -102,11 +102,11 @@ int login_main(int argc, char **argv)
* username must be a separate token * username must be a separate token
* (-f root, *NOT* -froot). --marekm * (-f root, *NOT* -froot). --marekm
*/ */
if ( optarg != argv[optind-1] ) if (optarg != argv[optind-1])
bb_show_usage( ); bb_show_usage();
if ( !amroot ) /* Auth bypass only if real UID is zero */ if (!amroot) /* Auth bypass only if real UID is zero */
bb_error_msg_and_die ( "-f permission denied" ); bb_error_msg_and_die("-f permission denied");
safe_strncpy(username, optarg, USERNAME_SIZE); safe_strncpy(username, optarg, USERNAME_SIZE);
opt_fflag = 1; opt_fflag = 1;
@ -115,59 +115,60 @@ int login_main(int argc, char **argv)
opt_host = optarg; opt_host = optarg;
break; break;
default: 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); 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 */ return EXIT_FAILURE; /* Must be a terminal */
#ifdef CONFIG_FEATURE_UTMP #ifdef CONFIG_FEATURE_UTMP
checkutmp ( !amroot ); checkutmp(!amroot);
#endif #endif
tmp = ttyname ( 0 ); tmp = ttyname(0);
if ( tmp && ( strncmp ( tmp, "/dev/", 5 ) == 0 )) if (tmp && (strncmp(tmp, "/dev/", 5) == 0))
safe_strncpy ( tty, tmp + 5, sizeof( tty )); safe_strncpy(tty, tmp + 5, sizeof(tty));
else if ( tmp && *tmp == '/' ) else if (tmp && *tmp == '/')
safe_strncpy ( tty, tmp, sizeof( tty )); safe_strncpy(tty, tmp, sizeof(tty));
else else
safe_strncpy ( tty, "UNKNOWN", sizeof( tty )); safe_strncpy(tty, "UNKNOWN", sizeof(tty));
#ifdef CONFIG_FEATURE_UTMP #ifdef CONFIG_FEATURE_UTMP
if ( amroot ) if (amroot)
memset ( utent.ut_host, 0, sizeof utent.ut_host ); memset(utent.ut_host, 0, sizeof(utent.ut_host));
#endif #endif
if ( opt_host ) { if (opt_host) {
#ifdef CONFIG_FEATURE_UTMP #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 #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 else
snprintf ( fromhost, sizeof( fromhost ) - 1, " on `%.100s'", tty ); snprintf(fromhost, sizeof(fromhost)-1, " on `%.100s'", tty);
bb_setpgrp; 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; failed = 0;
if ( !username[0] ) if (!username[0])
if(!login_prompt ( username )) if (!login_prompt(username))
return EXIT_FAILURE; return EXIT_FAILURE;
if ( !alarmstarted && ( TIMEOUT > 0 )) { if (!alarmstarted && (TIMEOUT > 0)) {
alarm ( TIMEOUT ); alarm(TIMEOUT);
alarmstarted = 1; alarmstarted = 1;
} }
if (!( pw = getpwnam ( username ))) { pw = getpwnam(username);
if (!pw) {
pw_copy.pw_name = "UNKNOWN"; pw_copy.pw_name = "UNKNOWN";
pw_copy.pw_passwd = "!"; pw_copy.pw_passwd = "!";
opt_fflag = 0; opt_fflag = 0;
@ -177,93 +178,92 @@ int login_main(int argc, char **argv)
pw = &pw_copy; pw = &pw_copy;
if (( pw-> pw_passwd [0] == '!' ) || ( pw-> pw_passwd[0] == '*' )) if ((pw->pw_passwd[0] == '!') || (pw->pw_passwd[0] == '*'))
failed = 1; failed = 1;
if ( opt_fflag ) { if (opt_fflag) {
opt_fflag = 0; opt_fflag = 0;
goto auth_ok; goto auth_ok;
} }
if (!failed && ( pw-> pw_uid == 0 ) && ( !check_tty ( tty ))) if (!failed && (pw->pw_uid == 0) && (!check_tty(tty)))
failed = 1; failed = 1;
/* Don't check the password if password entry is empty (!) */ /* Don't check the password if password entry is empty (!) */
if ( !pw-> pw_passwd[0] ) if (!pw->pw_passwd[0])
goto auth_ok; goto auth_ok;
/* authorization takes place here */ /* authorization takes place here */
if ( correct_password ( pw )) if (correct_password(pw))
goto auth_ok; goto auth_ok;
failed = 1; failed = 1;
auth_ok: auth_ok:
if ( !failed) if (!failed)
break; break;
bb_do_delay(FAIL_DELAY); bb_do_delay(FAIL_DELAY);
puts("Login incorrect"); puts("Login incorrect");
username[0] = 0; username[0] = 0;
if ( ++count == 3 ) { if (++count == 3) {
syslog ( LOG_WARNING, "invalid password for `%s'%s\n", pw->pw_name, fromhost); syslog(LOG_WARNING, "invalid password for `%s'%s'\n", pw->pw_name, fromhost);
return EXIT_FAILURE; return EXIT_FAILURE;
} }
} }
alarm ( 0 ); alarm(0);
if ( check_nologin ( pw-> pw_uid == 0 )) if (check_nologin(pw->pw_uid == 0))
return EXIT_FAILURE; return EXIT_FAILURE;
#ifdef CONFIG_FEATURE_UTMP #ifdef CONFIG_FEATURE_UTMP
setutmp ( username, tty ); setutmp(username, tty);
#endif #endif
if ( *tty != '/' ) if (*tty != '/')
snprintf ( full_tty, sizeof( full_tty ) - 1, "/dev/%s", tty); snprintf(full_tty, sizeof(full_tty)-1, "/dev/%s", tty);
else else
safe_strncpy ( full_tty, tty, sizeof( full_tty ) - 1 ); safe_strncpy(full_tty, tty, sizeof(full_tty)-1);
#ifdef CONFIG_SELINUX #ifdef CONFIG_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;
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); fprintf(stderr, "Unable to get SID for %s\n", username);
exit(1); exit(1);
} }
if (getfilecon(full_tty, &old_tty_sid) < 0) if (getfilecon(full_tty, &old_tty_sid) < 0) {
{ fprintf(stderr, "getfilecon(%.100s) failed: "
fprintf(stderr, "getfilecon(%.100s) failed: %.100s\n", full_tty, strerror(errno)); "%.100s\n", full_tty, strerror(errno));
return EXIT_FAILURE; return EXIT_FAILURE;
} }
if (security_compute_relabel(user_sid, old_tty_sid, SECCLASS_CHR_FILE, &new_tty_sid) != 0) 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)); fprintf(stderr, "security_change_sid(%.100s) failed: "
"%.100s\n", full_tty, strerror(errno));
return EXIT_FAILURE; return EXIT_FAILURE;
} }
if(setfilecon(full_tty, new_tty_sid) != 0) if (setfilecon(full_tty, new_tty_sid) != 0) {
{ fprintf(stderr, "chsid(%.100s, %s) failed: "
fprintf(stderr, "chsid(%.100s, %s) failed: %.100s\n", full_tty, new_tty_sid, strerror(errno)); "%.100s\n", full_tty, new_tty_sid, strerror(errno));
return EXIT_FAILURE; return EXIT_FAILURE;
} }
} }
#endif #endif
if ( !is_my_tty ( full_tty )) if (!is_my_tty(full_tty))
syslog ( LOG_ERR, "unable to determine TTY name, got %s\n", full_tty ); syslog(LOG_ERR, "unable to determine TTY name, got %s\n", full_tty);
/* Try these, but don't complain if they fail /* Try these, but don't complain if they fail
* (for example when the root fs is read only) */ * (for example when the root fs is read only) */
chown ( full_tty, pw-> pw_uid, pw-> pw_gid ); chown(full_tty, pw->pw_uid, pw->pw_gid);
chmod ( full_tty, 0600 ); chmod(full_tty, 0600);
if (ENABLE_LOGIN_SCRIPTS) { if (ENABLE_LOGIN_SCRIPTS) {
char *script = getenv("LOGIN_PRE_SUID_SCRIPT"); char *script = getenv("LOGIN_PRE_SUID_SCRIPT");
if (script) { if (script) {
char *t_argv[2] = { script, NULL }; char *t_argv[2] = { script, NULL };
switch(fork()) { switch (fork()) {
case -1: break; case -1: break;
case 0: /* child */ case 0: /* child */
xchdir("/"); xchdir("/");
@ -280,99 +280,100 @@ auth_ok:
} }
} }
change_identity ( pw ); change_identity(pw);
tmp = pw-> pw_shell; tmp = pw->pw_shell;
if(!tmp || !*tmp) if (!tmp || !*tmp)
tmp = DEFAULT_SHELL; tmp = DEFAULT_SHELL;
setup_environment ( tmp, 1, !opt_preserve, pw ); setup_environment(tmp, 1, !opt_preserve, pw);
motd ( ); motd();
signal ( SIGALRM, SIG_DFL ); /* default alarm signal */ signal(SIGALRM, SIG_DFL); /* default alarm signal */
if ( pw-> pw_uid == 0 ) if (pw->pw_uid == 0)
syslog ( LOG_INFO, "root login %s\n", fromhost ); syslog(LOG_INFO, "root login %s\n", fromhost);
#ifdef CONFIG_SELINUX #ifdef CONFIG_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);
#endif #endif
run_shell ( tmp, 1, 0, 0); /* exec the shell finally. */ run_shell(tmp, 1, 0, 0); /* exec the shell finally. */
return EXIT_FAILURE; 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; char *sp, *ep;
int i; int i;
for(i=0; i<EMPTY_USERNAME_COUNT; i++) { for (i=0; i<EMPTY_USERNAME_COUNT; i++) {
print_login_prompt(); print_login_prompt();
if ( !fgets ( buf, sizeof( buf ) - 1, stdin )) if (!fgets(buf, sizeof(buf)-1, stdin))
return 0; return 0;
if ( !strchr ( buf, '\n' )) if (!strchr(buf, '\n'))
return 0; return 0;
for ( sp = buf; isspace ( *sp ); sp++ ) { } for (sp = buf; isspace(*sp); sp++) { }
for ( ep = sp; isgraph ( *ep ); ep++ ) { } for (ep = sp; isgraph(*ep); ep++) { }
*ep = 0; *ep = '\0';
safe_strncpy(buf_name, sp, USERNAME_SIZE); safe_strncpy(buf_name, sp, USERNAME_SIZE);
if(buf_name[0]) if (buf_name[0])
return 1; return 1;
} }
return 0; 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; FILE *fp;
int c; int c;
if (( fp = fopen ( bb_path_nologin_file, "r" ))) { fp = fopen(bb_path_nologin_file, "r");
while (( c = getc ( fp )) != EOF ) if (fp) {
putchar (( c == '\n' ) ? '\r' : c ); while ((c = getc(fp)) != EOF)
putchar((c=='\n') ? '\r' : c);
fflush ( stdout ); fflush(stdout);
fclose ( fp ); fclose(fp);
} else { } else {
puts ( "\r\nSystem closed for routine maintenance.\r" ); puts("\r\nSystem closed for routine maintenance.\r");
} }
if ( !amroot ) if (!amroot)
return 1; return 1;
puts ( "\r\n[Disconnect bypassed -- root login allowed.]\r" ); puts("\r\n[Disconnect bypassed -- root login allowed.]\r");
} }
return 0; return 0;
} }
#ifdef CONFIG_FEATURE_SECURETTY #ifdef CONFIG_FEATURE_SECURETTY
static int check_tty ( const char *tty ) static int check_tty(const char *tty)
{ {
FILE *fp; FILE *fp;
int i; int i;
char buf[BUFSIZ]; char buf[BUFSIZ];
if (( fp = fopen ( bb_path_securetty_file, "r" ))) { fp = fopen(bb_path_securetty_file, "r");
while ( fgets ( buf, sizeof( buf ) - 1, fp )) { if (fp) {
for ( i = strlen( buf ) - 1; i >= 0; --i ) { while (fgets(buf, sizeof(buf)-1, fp)) {
if ( !isspace ( buf[i] )) for(i = strlen(buf)-1; i>=0; --i) {
if (!isspace(buf[i]))
break; break;
} }
buf[++i] = '\0'; buf[++i] = '\0';
if (( buf [0] == '\0' ) || ( buf [0] == '#' )) if ((buf[0]=='\0') || (buf[0]=='#'))
continue; continue;
if ( strcmp ( buf, tty ) == 0 ) { if (strcmp(buf, tty)== 0) {
fclose ( fp ); fclose(fp);
return 1; return 1;
} }
} }
@ -386,29 +387,30 @@ static int check_tty ( const char *tty )
#endif #endif
/* returns 1 if true */ /* 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; 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; return 0;
if ( by_name. st_rdev != by_fd. st_rdev ) if (by_name.st_rdev != by_fd.st_rdev)
return 0; return 0;
else else
return 1; return 1;
} }
static void motd (void) static void motd(void)
{ {
FILE *fp; FILE *fp;
int c; int c;
if (( fp = fopen ( bb_path_motd_file, "r" ))) { fp = fopen(bb_path_motd_file, "r");
while (( c = getc ( fp )) != EOF ) if (fp) {
putchar ( c ); while ((c = getc(fp)) != EOF)
fclose ( fp ); putchar(c);
fclose(fp);
} }
} }
@ -466,13 +468,13 @@ static void checkutmp(int picky)
} }
if (strncmp(line, "/dev/", 5) == 0) if (strncmp(line, "/dev/", 5) == 0)
line += 5; line += 5;
memset(&utent, 0, sizeof utent); memset(&utent, 0, sizeof(utent));
utent.ut_type = LOGIN_PROCESS; utent.ut_type = LOGIN_PROCESS;
utent.ut_pid = pid; 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?? */ /* XXX - assumes /dev/tty?? */
strncpy(utent.ut_id, utent.ut_line + 3, sizeof utent.ut_id); strncpy(utent.ut_id, utent.ut_line + 3, sizeof(utent.ut_id));
strncpy(utent.ut_user, "LOGIN", sizeof utent.ut_user); strncpy(utent.ut_user, "LOGIN", sizeof(utent.ut_user));
t_tmp = (time_t)utent.ut_time; t_tmp = (time_t)utent.ut_time;
time(&t_tmp); 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; time_t t_tmp = (time_t)utent.ut_time;
utent.ut_type = USER_PROCESS; 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); time(&t_tmp);
/* other fields already filled in by checkutmp above */ /* other fields already filled in by checkutmp above */
setutent(); setutent();