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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