[821] | 1 | /* vi: set sw=4 ts=4: */
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[1770] | 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | #include "libbb.h"
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[821] | 7 | #include <utmp.h>
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| 8 | #include <sys/resource.h>
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[1770] | 9 | #include <syslog.h>
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[821] | 10 |
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[1770] | 11 | #if ENABLE_SELINUX
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[821] | 12 | #include <selinux/selinux.h> /* for is_selinux_enabled() */
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| 13 | #include <selinux/get_context_list.h> /* for get_default_context() */
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| 14 | #include <selinux/flask.h> /* for security class definitions */
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| 15 | #endif
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| 16 |
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[1770] | 17 | #if ENABLE_PAM
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| 18 | /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
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| 19 | #undef setlocale
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| 20 | /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx.
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| 21 | * Apparently they like to confuse people. */
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| 22 | #include <security/pam_appl.h>
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| 23 | #include <security/pam_misc.h>
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| 24 | static const struct pam_conv conv = {
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| 25 | misc_conv,
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| 26 | NULL
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| 27 | };
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[821] | 28 | #endif
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| 29 |
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[1770] | 30 | enum {
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| 31 | TIMEOUT = 60,
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| 32 | EMPTY_USERNAME_COUNT = 10,
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| 33 | USERNAME_SIZE = 32,
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| 34 | TTYNAME_SIZE = 32,
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| 35 | };
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[821] | 36 |
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[1770] | 37 | static char* short_tty;
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[821] | 38 |
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[1770] | 39 | #if ENABLE_FEATURE_UTMP
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| 40 | /* vv Taken from tinylogin utmp.c vv */
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| 41 | /*
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| 42 | * read_or_build_utent - see if utmp file is correct for this process
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| 43 | *
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| 44 | * System V is very picky about the contents of the utmp file
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| 45 | * and requires that a slot for the current process exist.
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| 46 | * The utmp file is scanned for an entry with the same process
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| 47 | * ID. If no entry exists the process exits with a message.
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| 48 | *
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| 49 | * The "picky" flag is for network and other logins that may
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| 50 | * use special flags. It allows the pid checks to be overridden.
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| 51 | * This means that getty should never invoke login with any
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| 52 | * command line flags.
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| 53 | */
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[821] | 54 |
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[1770] | 55 | static void read_or_build_utent(struct utmp *utptr, int picky)
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| 56 | {
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| 57 | struct utmp *ut;
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| 58 | pid_t pid = getpid();
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[821] | 59 |
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[1770] | 60 | setutent();
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[821] | 61 |
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[1770] | 62 | /* First, try to find a valid utmp entry for this process. */
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| 63 | while ((ut = getutent()))
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| 64 | if (ut->ut_pid == pid && ut->ut_line[0] && ut->ut_id[0] &&
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| 65 | (ut->ut_type == LOGIN_PROCESS || ut->ut_type == USER_PROCESS))
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| 66 | break;
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[821] | 67 |
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[1770] | 68 | /* If there is one, just use it, otherwise create a new one. */
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| 69 | if (ut) {
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| 70 | *utptr = *ut;
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| 71 | } else {
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| 72 | if (picky)
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| 73 | bb_error_msg_and_die("no utmp entry found");
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[821] | 74 |
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[1770] | 75 | memset(utptr, 0, sizeof(*utptr));
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| 76 | utptr->ut_type = LOGIN_PROCESS;
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| 77 | utptr->ut_pid = pid;
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| 78 | strncpy(utptr->ut_line, short_tty, sizeof(utptr->ut_line));
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| 79 | /* This one is only 4 chars wide. Try to fit something
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| 80 | * remotely meaningful by skipping "tty"... */
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| 81 | strncpy(utptr->ut_id, short_tty + 3, sizeof(utptr->ut_id));
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| 82 | strncpy(utptr->ut_user, "LOGIN", sizeof(utptr->ut_user));
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| 83 | utptr->ut_time = time(NULL);
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| 84 | }
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| 85 | if (!picky) /* root login */
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| 86 | memset(utptr->ut_host, 0, sizeof(utptr->ut_host));
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| 87 | }
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[821] | 88 |
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[1770] | 89 | /*
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| 90 | * write_utent - put a USER_PROCESS entry in the utmp file
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| 91 | *
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| 92 | * write_utent changes the type of the current utmp entry to
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| 93 | * USER_PROCESS. the wtmp file will be updated as well.
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| 94 | */
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| 95 | static void write_utent(struct utmp *utptr, const char *username)
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[821] | 96 | {
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[1770] | 97 | utptr->ut_type = USER_PROCESS;
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| 98 | strncpy(utptr->ut_user, username, sizeof(utptr->ut_user));
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| 99 | utptr->ut_time = time(NULL);
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| 100 | /* other fields already filled in by read_or_build_utent above */
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| 101 | setutent();
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| 102 | pututline(utptr);
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| 103 | endutent();
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| 104 | #if ENABLE_FEATURE_WTMP
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| 105 | if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
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| 106 | close(creat(bb_path_wtmp_file, 0664));
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| 107 | }
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| 108 | updwtmp(bb_path_wtmp_file, utptr);
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| 109 | #endif
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[821] | 110 | }
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[1770] | 111 | #else /* !ENABLE_FEATURE_UTMP */
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| 112 | #define read_or_build_utent(utptr, picky) ((void)0)
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| 113 | #define write_utent(utptr, username) ((void)0)
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| 114 | #endif /* !ENABLE_FEATURE_UTMP */
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[821] | 115 |
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[1770] | 116 | #if ENABLE_FEATURE_NOLOGIN
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| 117 | static void die_if_nologin_and_non_root(int amroot)
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[821] | 118 | {
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[1770] | 119 | FILE *fp;
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| 120 | int c;
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[821] | 121 |
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[1770] | 122 | if (access("/etc/nologin", F_OK))
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| 123 | return;
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[821] | 124 |
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[1770] | 125 | fp = fopen("/etc/nologin", "r");
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| 126 | if (fp) {
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| 127 | while ((c = getc(fp)) != EOF)
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| 128 | putchar((c=='\n') ? '\r' : c);
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| 129 | fflush(stdout);
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| 130 | fclose(fp);
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| 131 | } else
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| 132 | puts("\r\nSystem closed for routine maintenance\r");
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| 133 | if (!amroot)
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| 134 | exit(1);
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| 135 | puts("\r\n[Disconnect bypassed -- root login allowed]\r");
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| 136 | }
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| 137 | #else
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| 138 | static ALWAYS_INLINE void die_if_nologin_and_non_root(int amroot) {}
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| 139 | #endif
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[821] | 140 |
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[1770] | 141 | #if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM
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| 142 | static int check_securetty(void)
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| 143 | {
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| 144 | FILE *fp;
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| 145 | int i;
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| 146 | char buf[256];
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[821] | 147 |
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[1770] | 148 | fp = fopen("/etc/securetty", "r");
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| 149 | if (!fp) {
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| 150 | /* A missing securetty file is not an error. */
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| 151 | return 1;
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| 152 | }
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| 153 | while (fgets(buf, sizeof(buf)-1, fp)) {
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| 154 | for (i = strlen(buf)-1; i >= 0; --i) {
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| 155 | if (!isspace(buf[i]))
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| 156 | break;
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[821] | 157 | }
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[1770] | 158 | buf[++i] = '\0';
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| 159 | if (!buf[0] || (buf[0] == '#'))
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| 160 | continue;
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| 161 | if (strcmp(buf, short_tty) == 0) {
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| 162 | fclose(fp);
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| 163 | return 1;
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| 164 | }
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[821] | 165 | }
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[1770] | 166 | fclose(fp);
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| 167 | return 0;
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| 168 | }
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| 169 | #else
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| 170 | static ALWAYS_INLINE int check_securetty(void) { return 1; }
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| 171 | #endif
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[821] | 172 |
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[1770] | 173 | static void get_username_or_die(char *buf, int size_buf)
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| 174 | {
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| 175 | int c, cntdown;
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[821] | 176 |
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[1770] | 177 | cntdown = EMPTY_USERNAME_COUNT;
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| 178 | prompt:
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| 179 | print_login_prompt();
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| 180 | /* skip whitespace */
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| 181 | do {
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| 182 | c = getchar();
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| 183 | if (c == EOF) exit(1);
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| 184 | if (c == '\n') {
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| 185 | if (!--cntdown) exit(1);
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| 186 | goto prompt;
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| 187 | }
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| 188 | } while (isspace(c));
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[821] | 189 |
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[1770] | 190 | *buf++ = c;
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| 191 | if (!fgets(buf, size_buf-2, stdin))
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| 192 | exit(1);
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| 193 | if (!strchr(buf, '\n'))
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| 194 | exit(1);
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| 195 | while (isgraph(*buf)) buf++;
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| 196 | *buf = '\0';
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| 197 | }
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[821] | 198 |
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[1770] | 199 | static void motd(void)
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| 200 | {
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| 201 | int fd;
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[821] | 202 |
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[1770] | 203 | fd = open(bb_path_motd_file, O_RDONLY);
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| 204 | if (fd) {
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| 205 | fflush(stdout);
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| 206 | bb_copyfd_eof(fd, STDOUT_FILENO);
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| 207 | close(fd);
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[821] | 208 | }
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[1770] | 209 | }
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[821] | 210 |
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[1770] | 211 | static void alarm_handler(int sig ATTRIBUTE_UNUSED)
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| 212 | {
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| 213 | /* This is the escape hatch! Poor serial line users and the like
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| 214 | * arrive here when their connection is broken.
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| 215 | * We don't want to block here */
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| 216 | ndelay_on(1);
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| 217 | ndelay_on(2);
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| 218 | printf("\r\nLogin timed out after %d seconds\r\n", TIMEOUT);
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| 219 | exit(EXIT_SUCCESS);
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| 220 | }
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[821] | 221 |
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[1770] | 222 | int login_main(int argc, char **argv);
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| 223 | int login_main(int argc, char **argv)
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| 224 | {
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| 225 | enum {
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| 226 | LOGIN_OPT_f = (1<<0),
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| 227 | LOGIN_OPT_h = (1<<1),
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| 228 | LOGIN_OPT_p = (1<<2),
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| 229 | };
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| 230 | char *fromhost;
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| 231 | char username[USERNAME_SIZE];
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| 232 | const char *tmp;
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| 233 | int amroot;
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| 234 | unsigned opt;
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| 235 | int count = 0;
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| 236 | struct passwd *pw;
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| 237 | char *opt_host = NULL;
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| 238 | char *opt_user = NULL;
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| 239 | char full_tty[TTYNAME_SIZE];
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| 240 | USE_SELINUX(security_context_t user_sid = NULL;)
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| 241 | USE_FEATURE_UTMP(struct utmp utent;)
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| 242 | USE_PAM(pam_handle_t *pamh;)
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| 243 | USE_PAM(int pamret;)
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| 244 | USE_PAM(const char *failed_msg;)
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[821] | 245 |
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[1770] | 246 | short_tty = full_tty;
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| 247 | username[0] = '\0';
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| 248 | amroot = (getuid() == 0);
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| 249 | signal(SIGALRM, alarm_handler);
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| 250 | alarm(TIMEOUT);
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[821] | 251 |
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[1770] | 252 | /* Mandatory paranoia for suid applet:
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| 253 | * ensure that fd# 0,1,2 are opened (at least to /dev/null)
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| 254 | * and any extra open fd's are closed.
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| 255 | * (The name of the function is misleading. Not daemonizing here.) */
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| 256 | bb_daemonize_or_rexec(DAEMON_ONLY_SANITIZE | DAEMON_CLOSE_EXTRA_FDS, NULL);
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[821] | 257 |
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[1770] | 258 | opt = getopt32(argv, "f:h:p", &opt_user, &opt_host);
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| 259 | if (opt & LOGIN_OPT_f) {
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| 260 | if (!amroot)
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| 261 | bb_error_msg_and_die("-f is for root only");
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| 262 | safe_strncpy(username, opt_user, sizeof(username));
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| 263 | }
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| 264 | if (optind < argc) /* user from command line (getty) */
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| 265 | safe_strncpy(username, argv[optind], sizeof(username));
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[821] | 266 |
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[1770] | 267 | /* Let's find out and memorize our tty */
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| 268 | if (!isatty(0) || !isatty(1) || !isatty(2))
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| 269 | return EXIT_FAILURE; /* Must be a terminal */
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| 270 | safe_strncpy(full_tty, "UNKNOWN", sizeof(full_tty));
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| 271 | tmp = ttyname(0);
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| 272 | if (tmp) {
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| 273 | safe_strncpy(full_tty, tmp, sizeof(full_tty));
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| 274 | if (strncmp(full_tty, "/dev/", 5) == 0)
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| 275 | short_tty = full_tty + 5;
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| 276 | }
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[821] | 277 |
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[1770] | 278 | read_or_build_utent(&utent, !amroot);
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[821] | 279 |
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[1770] | 280 | if (opt_host) {
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| 281 | USE_FEATURE_UTMP(
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| 282 | safe_strncpy(utent.ut_host, opt_host, sizeof(utent.ut_host));
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| 283 | )
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| 284 | fromhost = xasprintf(" on '%s' from '%s'", short_tty, opt_host);
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| 285 | } else
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| 286 | fromhost = xasprintf(" on '%s'", short_tty);
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[821] | 287 |
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[1770] | 288 | /* Was breaking "login <username>" from shell command line: */
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| 289 | /*bb_setpgrp();*/
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| 290 |
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| 291 | openlog(applet_name, LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
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| 292 |
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| 293 | while (1) {
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| 294 | if (!username[0])
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| 295 | get_username_or_die(username, sizeof(username));
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| 296 |
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| 297 | #if ENABLE_PAM
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| 298 | pamret = pam_start("login", username, &conv, &pamh);
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| 299 | if (pamret != PAM_SUCCESS) {
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| 300 | failed_msg = "pam_start";
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| 301 | goto pam_auth_failed;
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[821] | 302 | }
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[1770] | 303 | /* set TTY (so things like securetty work) */
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| 304 | pamret = pam_set_item(pamh, PAM_TTY, short_tty);
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| 305 | if (pamret != PAM_SUCCESS) {
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| 306 | failed_msg = "pam_set_item(TTY)";
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| 307 | goto pam_auth_failed;
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| 308 | }
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| 309 | pamret = pam_authenticate(pamh, 0);
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| 310 | if (pamret != PAM_SUCCESS) {
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| 311 | failed_msg = "pam_authenticate";
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| 312 | goto pam_auth_failed;
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| 313 | /* TODO: or just "goto auth_failed"
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| 314 | * since user seems to enter wrong password
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| 315 | * (in this case pamret == 7)
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| 316 | */
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| 317 | }
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| 318 | /* check that the account is healthy */
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| 319 | pamret = pam_acct_mgmt(pamh, 0);
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| 320 | if (pamret != PAM_SUCCESS) {
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| 321 | failed_msg = "account setup";
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| 322 | goto pam_auth_failed;
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| 323 | }
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| 324 | /* read user back */
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| 325 | {
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| 326 | const char *pamuser;
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| 327 | /* gcc: "dereferencing type-punned pointer breaks aliasing rules..."
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| 328 | * thus we cast to (void*) */
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| 329 | if (pam_get_item(pamh, PAM_USER, (void*)&pamuser) != PAM_SUCCESS) {
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| 330 | failed_msg = "pam_get_item(USER)";
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| 331 | goto pam_auth_failed;
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| 332 | }
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| 333 | safe_strncpy(username, pamuser, sizeof(username));
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| 334 | }
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| 335 | /* If we get here, the user was authenticated, and is
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| 336 | * granted access. */
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| 337 | pw = getpwnam(username);
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| 338 | if (pw)
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| 339 | break;
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| 340 | goto auth_failed;
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| 341 | pam_auth_failed:
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| 342 | bb_error_msg("%s failed: %s (%d)", failed_msg, pam_strerror(pamh, pamret), pamret);
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| 343 | safe_strncpy(username, "UNKNOWN", sizeof(username));
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| 344 | #else /* not PAM */
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| 345 | pw = getpwnam(username);
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| 346 | if (!pw) {
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| 347 | strcpy(username, "UNKNOWN");
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| 348 | goto fake_it;
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| 349 | }
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[821] | 350 |
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[1770] | 351 | if (pw->pw_passwd[0] == '!' || pw->pw_passwd[0] == '*')
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| 352 | goto auth_failed;
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[821] | 353 |
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[1770] | 354 | if (opt & LOGIN_OPT_f)
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| 355 | break; /* -f USER: success without asking passwd */
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[821] | 356 |
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[1770] | 357 | if (pw->pw_uid == 0 && !check_securetty())
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| 358 | goto auth_failed;
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[821] | 359 |
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[1770] | 360 | /* Don't check the password if password entry is empty (!) */
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| 361 | if (!pw->pw_passwd[0])
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[821] | 362 | break;
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[1770] | 363 | fake_it:
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| 364 | /* authorization takes place here */
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| 365 | if (correct_password(pw))
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| 366 | break;
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| 367 | #endif /* ENABLE_PAM */
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| 368 | auth_failed:
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| 369 | opt &= ~LOGIN_OPT_f;
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[821] | 370 | bb_do_delay(FAIL_DELAY);
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[1770] | 371 | /* TODO: doesn't sound like correct English phrase to me */
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[821] | 372 | puts("Login incorrect");
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[1770] | 373 | if (++count == 3) {
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| 374 | syslog(LOG_WARNING, "invalid password for '%s'%s",
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| 375 | username, fromhost);
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[821] | 376 | return EXIT_FAILURE;
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[1770] | 377 | }
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| 378 | username[0] = '\0';
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[821] | 379 | }
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| 380 |
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[1770] | 381 | alarm(0);
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| 382 | die_if_nologin_and_non_root(pw->pw_uid == 0);
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[821] | 383 |
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[1770] | 384 | write_utent(&utent, username);
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[821] | 385 |
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[1770] | 386 | #if ENABLE_SELINUX
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| 387 | if (is_selinux_enabled()) {
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[821] | 388 | security_context_t old_tty_sid, new_tty_sid;
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| 389 |
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[1770] | 390 | if (get_default_context(username, NULL, &user_sid)) {
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| 391 | bb_error_msg_and_die("cannot get SID for %s",
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| 392 | username);
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[821] | 393 | }
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[1770] | 394 | if (getfilecon(full_tty, &old_tty_sid) < 0) {
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| 395 | bb_perror_msg_and_die("getfilecon(%s) failed",
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| 396 | full_tty);
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[821] | 397 | }
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[1770] | 398 | if (security_compute_relabel(user_sid, old_tty_sid,
|
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| 399 | SECCLASS_CHR_FILE, &new_tty_sid) != 0) {
|
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| 400 | bb_perror_msg_and_die("security_change_sid(%s) failed",
|
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| 401 | full_tty);
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[821] | 402 | }
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[1770] | 403 | if (setfilecon(full_tty, new_tty_sid) != 0) {
|
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| 404 | bb_perror_msg_and_die("chsid(%s, %s) failed",
|
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| 405 | full_tty, new_tty_sid);
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[821] | 406 | }
|
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| 407 | }
|
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| 408 | #endif
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[1770] | 409 | /* Try these, but don't complain if they fail.
|
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| 410 | * _f_chown is safe wrt race t=ttyname(0);...;chown(t); */
|
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| 411 | fchown(0, pw->pw_uid, pw->pw_gid);
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| 412 | fchmod(0, 0600);
|
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[821] | 413 |
|
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[1770] | 414 | if (ENABLE_LOGIN_SCRIPTS) {
|
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| 415 | char *t_argv[2];
|
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[821] | 416 |
|
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[1770] | 417 | t_argv[0] = getenv("LOGIN_PRE_SUID_SCRIPT");
|
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| 418 | if (t_argv[0]) {
|
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| 419 | t_argv[1] = NULL;
|
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| 420 | xsetenv("LOGIN_TTY", full_tty);
|
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| 421 | xsetenv("LOGIN_USER", pw->pw_name);
|
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| 422 | xsetenv("LOGIN_UID", utoa(pw->pw_uid));
|
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| 423 | xsetenv("LOGIN_GID", utoa(pw->pw_gid));
|
---|
| 424 | xsetenv("LOGIN_SHELL", pw->pw_shell);
|
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| 425 | xspawn(t_argv); /* NOMMU-friendly */
|
---|
| 426 | /* All variables are unset by setup_environment */
|
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| 427 | wait(NULL);
|
---|
| 428 | }
|
---|
| 429 | }
|
---|
| 430 |
|
---|
| 431 | change_identity(pw);
|
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| 432 | tmp = pw->pw_shell;
|
---|
| 433 | if (!tmp || !*tmp)
|
---|
[821] | 434 | tmp = DEFAULT_SHELL;
|
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[1770] | 435 | /* setup_environment params: shell, loginshell, changeenv, pw */
|
---|
| 436 | setup_environment(tmp, 1, !(opt & LOGIN_OPT_p), pw);
|
---|
| 437 | /* FIXME: login shell = 1 -> 3rd parameter is ignored! */
|
---|
[821] | 438 |
|
---|
[1770] | 439 | motd();
|
---|
[821] | 440 |
|
---|
[1770] | 441 | if (pw->pw_uid == 0)
|
---|
| 442 | syslog(LOG_INFO, "root login%s", fromhost);
|
---|
| 443 | #if ENABLE_SELINUX
|
---|
[821] | 444 | /* well, a simple setexeccon() here would do the job as well,
|
---|
| 445 | * but let's play the game for now */
|
---|
| 446 | set_current_security_context(user_sid);
|
---|
| 447 | #endif
|
---|
| 448 |
|
---|
[1770] | 449 | // util-linux login also does:
|
---|
| 450 | // /* start new session */
|
---|
| 451 | // setsid();
|
---|
| 452 | // /* TIOCSCTTY: steal tty from other process group */
|
---|
| 453 | // if (ioctl(0, TIOCSCTTY, 1)) error_msg...
|
---|
| 454 | // BBox login used to do this (see above):
|
---|
| 455 | // bb_setpgrp();
|
---|
| 456 | // If this stuff is really needed, add it and explain why!
|
---|
[821] | 457 |
|
---|
[1770] | 458 | /* set signals to defaults */
|
---|
| 459 | signal(SIGALRM, SIG_DFL);
|
---|
| 460 | /* Is this correct? This way user can ctrl-c out of /etc/profile,
|
---|
| 461 | * potentially creating security breach (tested with bash 3.0).
|
---|
| 462 | * But without this, bash 3.0 will not enable ctrl-c either.
|
---|
| 463 | * Maybe bash is buggy?
|
---|
| 464 | * Need to find out what standards say about /bin/login -
|
---|
| 465 | * should it leave SIGINT etc enabled or disabled? */
|
---|
| 466 | signal(SIGINT, SIG_DFL);
|
---|
[821] | 467 |
|
---|
[1770] | 468 | /* Exec login shell with no additional parameters */
|
---|
| 469 | run_shell(tmp, 1, NULL, NULL);
|
---|
[821] | 470 |
|
---|
[1770] | 471 | /* return EXIT_FAILURE; - not reached */
|
---|
[821] | 472 | }
|
---|