| 1 | /* vi: set sw=4 ts=4: */
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| 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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| 7 | #include <syslog.h>
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| 8 |
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| 9 |
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| 10 | static void nuke_str(char *str)
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| 11 | {
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| 12 | if (str) memset(str, 0, strlen(str));
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| 13 | }
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| 14 |
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| 15 | static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
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| 16 | {
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| 17 | char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
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| 18 | char *orig = (char*)"";
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| 19 | char *newp = NULL;
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| 20 | char *cipher = NULL;
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| 21 | char *cp = NULL;
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| 22 | char *ret = NULL; /* failure so far */
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| 23 |
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| 24 | if (myuid && pw->pw_passwd[0]) {
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| 25 | orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
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| 26 | if (!orig)
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| 27 | goto err_ret;
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| 28 | cipher = pw_encrypt(orig, pw->pw_passwd); /* returns ptr to static */
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| 29 | if (strcmp(cipher, pw->pw_passwd) != 0) {
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| 30 | syslog(LOG_WARNING, "incorrect password for '%s'",
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| 31 | pw->pw_name);
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| 32 | bb_do_delay(FAIL_DELAY);
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| 33 | puts("Incorrect password");
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| 34 | goto err_ret;
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| 35 | }
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| 36 | }
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| 37 | orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
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| 38 | newp = bb_askpass(0, "New password:"); /* returns ptr to static */
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| 39 | if (!newp)
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| 40 | goto err_ret;
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| 41 | newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
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| 42 | if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
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| 43 | && obscure(orig, newp, pw) && myuid)
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| 44 | goto err_ret; /* non-root is not allowed to have weak passwd */
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| 45 |
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| 46 | cp = bb_askpass(0, "Retype password:");
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| 47 | if (!cp)
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| 48 | goto err_ret;
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| 49 | if (strcmp(cp, newp)) {
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| 50 | puts("Passwords don't match");
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| 51 | goto err_ret;
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| 52 | }
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| 53 |
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| 54 | crypt_make_salt(salt, 1, 0); /* des */
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| 55 | if (algo) { /* MD5 */
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| 56 | strcpy(salt, "$1$");
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| 57 | crypt_make_salt(salt + 3, 4, 0);
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| 58 | }
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| 59 | /* pw_encrypt returns ptr to static */
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| 60 | ret = xstrdup(pw_encrypt(newp, salt));
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| 61 | /* whee, success! */
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| 62 |
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| 63 | err_ret:
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| 64 | nuke_str(orig);
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| 65 | if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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| 66 | nuke_str(newp);
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| 67 | if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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| 68 | nuke_str(cipher);
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| 69 | nuke_str(cp);
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| 70 | return ret;
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| 71 | }
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| 72 |
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| 73 | int passwd_main(int argc, char **argv);
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| 74 | int passwd_main(int argc, char **argv)
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| 75 | {
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| 76 | enum {
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| 77 | OPT_algo = 0x1, /* -a - password algorithm */
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| 78 | OPT_lock = 0x2, /* -l - lock account */
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| 79 | OPT_unlock = 0x4, /* -u - unlock account */
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| 80 | OPT_delete = 0x8, /* -d - delete password */
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| 81 | OPT_lud = 0xe,
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| 82 | STATE_ALGO_md5 = 0x10,
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| 83 | //STATE_ALGO_des = 0x20, not needed yet
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| 84 | };
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| 85 | unsigned opt;
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| 86 | int rc;
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| 87 | const char *opt_a = "";
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| 88 | const char *filename;
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| 89 | char *myname;
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| 90 | char *name;
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| 91 | char *newp;
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| 92 | struct passwd *pw;
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| 93 | uid_t myuid;
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| 94 | struct rlimit rlimit_fsize;
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| 95 | char c;
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| 96 |
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| 97 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 98 | /* Using _r function to avoid pulling in static buffers */
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| 99 | struct spwd spw;
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| 100 | struct spwd *result;
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| 101 | char buffer[256];
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| 102 | #endif
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| 103 |
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| 104 | logmode = LOGMODE_BOTH;
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| 105 | openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
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| 106 | opt = getopt32(argv, "a:lud", &opt_a);
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| 107 | //argc -= optind;
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| 108 | argv += optind;
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| 109 |
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| 110 | if (strcasecmp(opt_a, "des") != 0) /* -a */
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| 111 | opt |= STATE_ALGO_md5;
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| 112 | //else
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| 113 | // opt |= STATE_ALGO_des;
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| 114 | myuid = getuid();
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| 115 | /* -l, -u, -d require root priv and username argument */
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| 116 | if ((opt & OPT_lud) && (myuid || !argv[0]))
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| 117 | bb_show_usage();
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| 118 |
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| 119 | /* Will complain and die if username not found */
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| 120 | myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
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| 121 | name = argv[0] ? argv[0] : myname;
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| 122 |
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| 123 | pw = getpwnam(name);
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| 124 | if (!pw) bb_error_msg_and_die("unknown user %s", name);
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| 125 | if (myuid && pw->pw_uid != myuid) {
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| 126 | /* LOGMODE_BOTH */
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| 127 | bb_error_msg_and_die("%s can't change password for %s", myname, name);
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| 128 | }
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| 129 |
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| 130 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 131 | /* getspnam_r() can lie! Even if user isn't in shadow, it can
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| 132 | * return success (pwd field was seen set to "!" in this case) */
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| 133 | if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
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| 134 | || LONE_CHAR(spw.sp_pwdp, '!')) {
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| 135 | /* LOGMODE_BOTH */
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| 136 | bb_error_msg("no record of %s in %s, using %s",
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| 137 | name, bb_path_shadow_file,
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| 138 | bb_path_passwd_file);
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| 139 | } else {
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| 140 | pw->pw_passwd = spw.sp_pwdp;
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| 141 | }
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| 142 | #endif
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| 143 |
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| 144 | /* Decide what the new password will be */
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| 145 | newp = NULL;
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| 146 | c = pw->pw_passwd[0] - '!';
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| 147 | if (!(opt & OPT_lud)) {
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| 148 | if (myuid && !c) { /* passwd starts with '!' */
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| 149 | /* LOGMODE_BOTH */
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| 150 | bb_error_msg_and_die("cannot change "
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| 151 | "locked password for %s", name);
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| 152 | }
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| 153 | printf("Changing password for %s\n", name);
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| 154 | newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
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| 155 | if (!newp) {
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| 156 | logmode = LOGMODE_STDIO;
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| 157 | bb_error_msg_and_die("password for %s is unchanged", name);
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| 158 | }
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| 159 | } else if (opt & OPT_lock) {
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| 160 | if (!c) goto skip; /* passwd starts with '!' */
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| 161 | newp = xasprintf("!%s", pw->pw_passwd);
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| 162 | } else if (opt & OPT_unlock) {
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| 163 | if (c) goto skip; /* not '!' */
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| 164 | /* pw->pw_passwd pints to static storage,
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| 165 | * strdup'ing to avoid nasty surprizes */
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| 166 | newp = xstrdup(&pw->pw_passwd[1]);
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| 167 | } else if (opt & OPT_delete) {
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| 168 | //newp = xstrdup("");
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| 169 | newp = (char*)"";
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| 170 | }
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| 171 |
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| 172 | rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
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| 173 | setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
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| 174 | signal(SIGHUP, SIG_IGN);
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| 175 | signal(SIGINT, SIG_IGN);
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| 176 | signal(SIGQUIT, SIG_IGN);
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| 177 | umask(077);
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| 178 | xsetuid(0);
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| 179 |
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| 180 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 181 | filename = bb_path_shadow_file;
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| 182 | rc = update_passwd(bb_path_shadow_file, name, newp);
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| 183 | if (rc == 0) /* no lines updated, no errors detected */
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| 184 | #endif
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| 185 | {
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| 186 | filename = bb_path_passwd_file;
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| 187 | rc = update_passwd(bb_path_passwd_file, name, newp);
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| 188 | }
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| 189 | /* LOGMODE_BOTH */
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| 190 | if (rc < 0)
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| 191 | bb_error_msg_and_die("cannot update password file %s",
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| 192 | filename);
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| 193 | bb_info_msg("Password for %s changed by %s", name, myname);
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| 194 |
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| 195 | //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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| 196 | skip:
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| 197 | if (!newp) {
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| 198 | bb_error_msg_and_die("password for %s is already %slocked",
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| 199 | name, (opt & OPT_unlock) ? "un" : "");
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| 200 | }
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| 201 | if (ENABLE_FEATURE_CLEAN_UP) free(myname);
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| 202 | return 0;
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| 203 | }
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