[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | #include <fcntl.h>
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| 3 | #include <signal.h>
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| 4 | #include <stdio.h>
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| 5 | #include <stdlib.h>
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| 6 | #include <string.h>
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| 7 | #include <syslog.h>
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| 8 | #include <termios.h>
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| 9 | #include <unistd.h>
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| 10 | #include <utmp.h>
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| 11 | #include <sys/resource.h>
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| 12 | #include <sys/stat.h>
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| 13 | #include <sys/types.h>
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| 14 | #include <ctype.h>
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| 15 | #include <time.h>
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| 16 |
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| 17 | #include "busybox.h"
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| 18 | #ifdef CONFIG_SELINUX
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| 19 | #include <selinux/selinux.h> /* for is_selinux_enabled() */
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| 20 | #include <selinux/get_context_list.h> /* for get_default_context() */
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| 21 | #include <selinux/flask.h> /* for security class definitions */
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| 22 | #include <errno.h>
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| 23 | #endif
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| 24 |
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| 25 | #ifdef CONFIG_FEATURE_UTMP
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| 26 | // import from utmp.c
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| 27 | static void checkutmp(int picky);
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| 28 | static void setutmp(const char *name, const char *line);
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| 29 | /* Stuff global to this file */
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| 30 | static struct utmp utent;
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| 31 | #endif
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| 32 |
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| 33 | // login defines
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| 34 | #define TIMEOUT 60
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| 35 | #define EMPTY_USERNAME_COUNT 10
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| 36 | #define USERNAME_SIZE 32
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| 37 |
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| 38 |
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| 39 | static int check_nologin ( int amroot );
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| 40 |
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| 41 | #if defined CONFIG_FEATURE_SECURETTY
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| 42 | static int check_tty ( const char *tty );
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| 43 |
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| 44 | #else
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| 45 | static inline int check_tty ( const char *tty ) { return 1; }
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| 46 |
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| 47 | #endif
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| 48 |
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| 49 | static int is_my_tty ( const char *tty );
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| 50 | static int login_prompt ( char *buf_name );
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| 51 | static void motd ( void );
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| 52 |
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| 53 |
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| 54 | static void alarm_handler ( int sig ATTRIBUTE_UNUSED)
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| 55 | {
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| 56 | fprintf (stderr, "\nLogin timed out after %d seconds.\n", TIMEOUT );
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| 57 | exit ( EXIT_SUCCESS );
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| 58 | }
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| 59 |
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| 60 |
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| 61 | int login_main(int argc, char **argv)
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| 62 | {
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| 63 | char tty[BUFSIZ];
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| 64 | char full_tty[200];
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| 65 | char fromhost[512];
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| 66 | char username[USERNAME_SIZE];
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| 67 | const char *tmp;
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| 68 | int amroot;
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| 69 | int flag;
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| 70 | int failed;
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| 71 | int count=0;
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| 72 | struct passwd *pw, pw_copy;
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| 73 | #ifdef CONFIG_WHEEL_GROUP
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| 74 | struct group *grp;
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| 75 | #endif
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| 76 | int opt_preserve = 0;
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| 77 | int opt_fflag = 0;
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| 78 | char *opt_host = 0;
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| 79 | int alarmstarted = 0;
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| 80 | #ifdef CONFIG_SELINUX
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| 81 | security_context_t user_sid = NULL;
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| 82 | #endif
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| 83 |
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| 84 | username[0]=0;
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| 85 | amroot = ( getuid ( ) == 0 );
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| 86 | signal ( SIGALRM, alarm_handler );
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| 87 | alarm ( TIMEOUT );
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| 88 | alarmstarted = 1;
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| 89 |
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| 90 | while (( flag = getopt(argc, argv, "f:h:p")) != EOF ) {
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| 91 | switch ( flag ) {
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| 92 | case 'p':
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| 93 | opt_preserve = 1;
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| 94 | break;
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| 95 | case 'f':
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| 96 | /*
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| 97 | * username must be a separate token
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| 98 | * (-f root, *NOT* -froot). --marekm
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| 99 | */
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| 100 | if ( optarg != argv[optind-1] )
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| 101 | bb_show_usage( );
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| 102 |
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| 103 | if ( !amroot ) /* Auth bypass only if real UID is zero */
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| 104 | bb_error_msg_and_die ( "-f permission denied" );
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| 105 |
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| 106 | safe_strncpy(username, optarg, USERNAME_SIZE);
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| 107 | opt_fflag = 1;
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| 108 | break;
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| 109 | case 'h':
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| 110 | opt_host = optarg;
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| 111 | break;
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| 112 | default:
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| 113 | bb_show_usage( );
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | if (optind < argc) // user from command line (getty)
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| 118 | safe_strncpy(username, argv[optind], USERNAME_SIZE);
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| 119 |
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| 120 | if ( !isatty ( 0 ) || !isatty ( 1 ) || !isatty ( 2 ))
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| 121 | return EXIT_FAILURE; /* Must be a terminal */
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| 122 |
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| 123 | #ifdef CONFIG_FEATURE_UTMP
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| 124 | checkutmp ( !amroot );
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| 125 | #endif
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| 126 |
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| 127 | tmp = ttyname ( 0 );
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| 128 | if ( tmp && ( strncmp ( tmp, "/dev/", 5 ) == 0 ))
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| 129 | safe_strncpy ( tty, tmp + 5, sizeof( tty ));
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| 130 | else if ( tmp && *tmp == '/' )
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| 131 | safe_strncpy ( tty, tmp, sizeof( tty ));
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| 132 | else
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| 133 | safe_strncpy ( tty, "UNKNOWN", sizeof( tty ));
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| 134 |
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| 135 | #ifdef CONFIG_FEATURE_UTMP
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| 136 | if ( amroot )
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| 137 | memset ( utent.ut_host, 0, sizeof utent.ut_host );
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| 138 | #endif
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| 139 |
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| 140 | if ( opt_host ) {
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| 141 | #ifdef CONFIG_FEATURE_UTMP
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| 142 | safe_strncpy ( utent.ut_host, opt_host, sizeof( utent. ut_host ));
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| 143 | #endif
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| 144 | snprintf ( fromhost, sizeof( fromhost ) - 1, " on `%.100s' from `%.200s'", tty, opt_host );
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| 145 | }
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| 146 | else
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| 147 | snprintf ( fromhost, sizeof( fromhost ) - 1, " on `%.100s'", tty );
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| 148 |
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| 149 | bb_setpgrp;
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| 150 |
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| 151 | openlog ( "login", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH );
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| 152 |
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| 153 | while ( 1 ) {
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| 154 | failed = 0;
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| 155 |
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| 156 | if ( !username[0] )
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| 157 | if(!login_prompt ( username ))
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| 158 | return EXIT_FAILURE;
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| 159 |
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| 160 | if ( !alarmstarted && ( TIMEOUT > 0 )) {
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| 161 | alarm ( TIMEOUT );
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| 162 | alarmstarted = 1;
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| 163 | }
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| 164 |
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| 165 | if (!( pw = getpwnam ( username ))) {
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| 166 | pw_copy.pw_name = "UNKNOWN";
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| 167 | pw_copy.pw_passwd = "!";
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| 168 | opt_fflag = 0;
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| 169 | failed = 1;
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| 170 | } else
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| 171 | pw_copy = *pw;
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| 172 |
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| 173 | pw = &pw_copy;
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| 174 |
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| 175 | if (( pw-> pw_passwd [0] == '!' ) || ( pw-> pw_passwd[0] == '*' ))
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| 176 | failed = 1;
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| 177 |
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| 178 | if ( opt_fflag ) {
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| 179 | opt_fflag = 0;
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| 180 | goto auth_ok;
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| 181 | }
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| 182 |
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| 183 | if (!failed && ( pw-> pw_uid == 0 ) && ( !check_tty ( tty )))
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| 184 | failed = 1;
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| 185 |
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| 186 | /* Don't check the password if password entry is empty (!) */
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| 187 | if ( !pw-> pw_passwd[0] )
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| 188 | goto auth_ok;
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| 189 |
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| 190 | /* authorization takes place here */
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| 191 | if ( correct_password ( pw ))
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| 192 | goto auth_ok;
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| 193 |
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| 194 | failed = 1;
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| 195 |
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| 196 | auth_ok:
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| 197 | if ( !failed)
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| 198 | break;
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| 199 |
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| 200 | bb_do_delay(FAIL_DELAY);
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| 201 | puts("Login incorrect");
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| 202 | username[0] = 0;
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| 203 | if ( ++count == 3 ) {
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| 204 | syslog ( LOG_WARNING, "invalid password for `%s'%s\n", pw->pw_name, fromhost);
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| 205 | return EXIT_FAILURE;
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | alarm ( 0 );
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| 210 | if ( check_nologin ( pw-> pw_uid == 0 ))
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| 211 | return EXIT_FAILURE;
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| 212 |
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| 213 | #ifdef CONFIG_FEATURE_UTMP
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| 214 | setutmp ( username, tty );
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| 215 | #endif
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| 216 |
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| 217 | if ( *tty != '/' )
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| 218 | snprintf ( full_tty, sizeof( full_tty ) - 1, "/dev/%s", tty);
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| 219 | else
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| 220 | safe_strncpy ( full_tty, tty, sizeof( full_tty ) - 1 );
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| 221 |
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| 222 | #ifdef CONFIG_SELINUX
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| 223 | if (is_selinux_enabled())
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| 224 | {
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| 225 | security_context_t old_tty_sid, new_tty_sid;
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| 226 |
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| 227 | if (get_default_context(username, NULL, &user_sid))
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| 228 | {
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| 229 | fprintf(stderr, "Unable to get SID for %s\n", username);
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| 230 | exit(1);
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| 231 | }
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| 232 | if (getfilecon(full_tty, &old_tty_sid) < 0)
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| 233 | {
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| 234 | fprintf(stderr, "getfilecon(%.100s) failed: %.100s\n", full_tty, strerror(errno));
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| 235 | return EXIT_FAILURE;
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| 236 | }
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| 237 | if (security_compute_relabel(user_sid, old_tty_sid, SECCLASS_CHR_FILE, &new_tty_sid) != 0)
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| 238 | {
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| 239 | fprintf(stderr, "security_change_sid(%.100s) failed: %.100s\n", full_tty, strerror(errno));
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| 240 | return EXIT_FAILURE;
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| 241 | }
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| 242 | if(setfilecon(full_tty, new_tty_sid) != 0)
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| 243 | {
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| 244 | fprintf(stderr, "chsid(%.100s, %s) failed: %.100s\n", full_tty, new_tty_sid, strerror(errno));
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| 245 | return EXIT_FAILURE;
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| 246 | }
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| 247 | }
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| 248 | #endif
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| 249 | if ( !is_my_tty ( full_tty ))
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| 250 | syslog ( LOG_ERR, "unable to determine TTY name, got %s\n", full_tty );
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| 251 |
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| 252 | /* Try these, but don't complain if they fail
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| 253 | * (for example when the root fs is read only) */
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| 254 | chown ( full_tty, pw-> pw_uid, pw-> pw_gid );
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| 255 | chmod ( full_tty, 0600 );
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| 256 |
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| 257 | change_identity ( pw );
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| 258 | tmp = pw-> pw_shell;
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| 259 | if(!tmp || !*tmp)
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| 260 | tmp = DEFAULT_SHELL;
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| 261 | setup_environment ( tmp, 1, !opt_preserve, pw );
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| 262 |
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| 263 | motd ( );
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| 264 | signal ( SIGALRM, SIG_DFL ); /* default alarm signal */
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| 265 |
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| 266 | if ( pw-> pw_uid == 0 )
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| 267 | syslog ( LOG_INFO, "root login %s\n", fromhost );
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| 268 | #ifdef CONFIG_SELINUX
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| 269 | /* well, a simple setexeccon() here would do the job as well,
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| 270 | * but let's play the game for now */
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| 271 | set_current_security_context(user_sid);
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| 272 | #endif
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| 273 | run_shell ( tmp, 1, 0, 0); /* exec the shell finally. */
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| 274 |
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| 275 | return EXIT_FAILURE;
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| 276 | }
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| 277 |
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| 278 |
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| 279 |
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| 280 | static int login_prompt ( char *buf_name )
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| 281 | {
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| 282 | char buf [1024];
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| 283 | char *sp, *ep;
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| 284 | int i;
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| 285 |
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| 286 | for(i=0; i<EMPTY_USERNAME_COUNT; i++) {
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| 287 | print_login_prompt();
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| 288 |
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| 289 | if ( !fgets ( buf, sizeof( buf ) - 1, stdin ))
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| 290 | return 0;
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| 291 |
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| 292 | if ( !strchr ( buf, '\n' ))
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| 293 | return 0;
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| 294 |
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| 295 | for ( sp = buf; isspace ( *sp ); sp++ ) { }
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| 296 | for ( ep = sp; isgraph ( *ep ); ep++ ) { }
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| 297 |
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| 298 | *ep = 0;
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| 299 | safe_strncpy(buf_name, sp, USERNAME_SIZE);
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| 300 | if(buf_name[0])
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| 301 | return 1;
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| 302 | }
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| 303 | return 0;
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| 304 | }
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| 305 |
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| 306 |
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| 307 | static int check_nologin ( int amroot )
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| 308 | {
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| 309 | if ( access ( bb_path_nologin_file, F_OK ) == 0 ) {
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| 310 | FILE *fp;
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| 311 | int c;
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| 312 |
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| 313 | if (( fp = fopen ( bb_path_nologin_file, "r" ))) {
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| 314 | while (( c = getc ( fp )) != EOF )
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| 315 | putchar (( c == '\n' ) ? '\r' : c );
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| 316 |
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| 317 | fflush ( stdout );
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| 318 | fclose ( fp );
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| 319 | } else {
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| 320 | puts ( "\r\nSystem closed for routine maintenance.\r" );
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| 321 | }
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| 322 | if ( !amroot )
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| 323 | return 1;
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| 324 |
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| 325 | puts ( "\r\n[Disconnect bypassed -- root login allowed.]\r" );
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| 326 | }
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| 327 | return 0;
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| 328 | }
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| 329 |
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| 330 | #ifdef CONFIG_FEATURE_SECURETTY
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| 331 |
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| 332 | static int check_tty ( const char *tty )
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| 333 | {
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| 334 | FILE *fp;
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| 335 | int i;
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| 336 | char buf[BUFSIZ];
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| 337 |
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| 338 | if (( fp = fopen ( bb_path_securetty_file, "r" ))) {
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| 339 | while ( fgets ( buf, sizeof( buf ) - 1, fp )) {
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| 340 | for ( i = strlen( buf ) - 1; i >= 0; --i ) {
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| 341 | if ( !isspace ( buf[i] ))
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| 342 | break;
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| 343 | }
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| 344 | buf[++i] = '\0';
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| 345 | if (( buf [0] == '\0' ) || ( buf [0] == '#' ))
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| 346 | continue;
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| 347 |
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| 348 | if ( strcmp ( buf, tty ) == 0 ) {
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| 349 | fclose ( fp );
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| 350 | return 1;
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| 351 | }
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| 352 | }
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| 353 | fclose(fp);
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| 354 | return 0;
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| 355 | }
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| 356 | /* A missing securetty file is not an error. */
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| 357 | return 1;
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| 358 | }
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| 359 |
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| 360 | #endif
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| 361 |
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| 362 | /* returns 1 if true */
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| 363 | static int is_my_tty ( const char *tty )
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| 364 | {
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| 365 | struct stat by_name, by_fd;
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| 366 |
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| 367 | if ( stat ( tty, &by_name ) || fstat ( 0, &by_fd ))
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| 368 | return 0;
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| 369 |
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| 370 | if ( by_name. st_rdev != by_fd. st_rdev )
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| 371 | return 0;
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| 372 | else
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| 373 | return 1;
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| 374 | }
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| 375 |
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| 376 |
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| 377 | static void motd (void)
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| 378 | {
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| 379 | FILE *fp;
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| 380 | register int c;
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| 381 |
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| 382 | if (( fp = fopen ( bb_path_motd_file, "r" ))) {
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| 383 | while (( c = getc ( fp )) != EOF )
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| 384 | putchar ( c );
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| 385 | fclose ( fp );
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| 386 | }
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| 387 | }
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| 388 |
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| 389 |
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| 390 | #ifdef CONFIG_FEATURE_UTMP
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| 391 | // vv Taken from tinylogin utmp.c vv
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| 392 |
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| 393 | #define NO_UTENT \
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| 394 | "No utmp entry. You must exec \"login\" from the lowest level \"sh\""
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| 395 | #define NO_TTY \
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| 396 | "Unable to determine your tty name."
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| 397 |
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| 398 | /*
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| 399 | * checkutmp - see if utmp file is correct for this process
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| 400 | *
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| 401 | * System V is very picky about the contents of the utmp file
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| 402 | * and requires that a slot for the current process exist.
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| 403 | * The utmp file is scanned for an entry with the same process
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| 404 | * ID. If no entry exists the process exits with a message.
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| 405 | *
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| 406 | * The "picky" flag is for network and other logins that may
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| 407 | * use special flags. It allows the pid checks to be overridden.
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| 408 | * This means that getty should never invoke login with any
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| 409 | * command line flags.
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| 410 | */
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| 411 |
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| 412 | static void checkutmp(int picky)
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| 413 | {
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| 414 | char *line;
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| 415 | struct utmp *ut;
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| 416 | pid_t pid = getpid();
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| 417 |
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| 418 | setutent();
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| 419 |
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| 420 | /* First, try to find a valid utmp entry for this process. */
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| 421 | while ((ut = getutent()))
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| 422 | if (ut->ut_pid == pid && ut->ut_line[0] && ut->ut_id[0] &&
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| 423 | (ut->ut_type == LOGIN_PROCESS || ut->ut_type == USER_PROCESS))
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| 424 | break;
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| 425 |
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| 426 | /* If there is one, just use it, otherwise create a new one. */
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| 427 | if (ut) {
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| 428 | utent = *ut;
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| 429 | } else {
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| 430 | time_t t_tmp;
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| 431 |
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| 432 | if (picky) {
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| 433 | puts(NO_UTENT);
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| 434 | exit(1);
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| 435 | }
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| 436 | line = ttyname(0);
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| 437 | if (!line) {
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| 438 | puts(NO_TTY);
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| 439 | exit(1);
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| 440 | }
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| 441 | if (strncmp(line, "/dev/", 5) == 0)
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| 442 | line += 5;
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| 443 | memset((void *) &utent, 0, sizeof utent);
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| 444 | utent.ut_type = LOGIN_PROCESS;
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| 445 | utent.ut_pid = pid;
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| 446 | strncpy(utent.ut_line, line, sizeof utent.ut_line);
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| 447 | /* XXX - assumes /dev/tty?? */
|
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| 448 | strncpy(utent.ut_id, utent.ut_line + 3, sizeof utent.ut_id);
|
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| 449 | strncpy(utent.ut_user, "LOGIN", sizeof utent.ut_user);
|
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| 450 | t_tmp = (time_t)utent.ut_time;
|
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| 451 | time(&t_tmp);
|
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| 452 | }
|
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| 453 | }
|
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| 454 |
|
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| 455 | /*
|
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| 456 | * setutmp - put a USER_PROCESS entry in the utmp file
|
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| 457 | *
|
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| 458 | * setutmp changes the type of the current utmp entry to
|
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| 459 | * USER_PROCESS. the wtmp file will be updated as well.
|
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| 460 | */
|
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| 461 |
|
---|
| 462 | static void setutmp(const char *name, const char *line ATTRIBUTE_UNUSED)
|
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| 463 | {
|
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| 464 | time_t t_tmp = (time_t)utent.ut_time;
|
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| 465 |
|
---|
| 466 | utent.ut_type = USER_PROCESS;
|
---|
| 467 | strncpy(utent.ut_user, name, sizeof utent.ut_user);
|
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| 468 | time(&t_tmp);
|
---|
| 469 | /* other fields already filled in by checkutmp above */
|
---|
| 470 | setutent();
|
---|
| 471 | pututline(&utent);
|
---|
| 472 | endutent();
|
---|
| 473 | #ifdef CONFIG_FEATURE_WTMP
|
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| 474 | if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
|
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| 475 | close(creat(bb_path_wtmp_file, 0664));
|
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| 476 | }
|
---|
| 477 | updwtmp(bb_path_wtmp_file, &utent);
|
---|
| 478 | #endif
|
---|
| 479 | }
|
---|
| 480 | #endif /* CONFIG_FEATURE_UTMP */
|
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