systemv/lppasswd.c

   1 /*
   2  * "$Id$"
   3  *
   4  *   MD5 password program for CUPS.
   5  *
   6  *   Copyright 2007-2011 by Apple Inc.
   7  *   Copyright 1997-2006 by Easy Software Products.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Apple Inc. and are protected by Federal copyright
  11  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  *   which should have been included with this file.  If this file is
  13  *   file is missing or damaged, see the license at "http://www.cups.org/".
  14  *
  15  * Contents:
  16  *
  17  *   main()  - Add, change, or delete passwords from the MD5 password file.
  18  *   usage() - Show program usage.
  19  */
  20
  21 /*
  22  * Include necessary headers...
  23  */
  24
  25 #include <cups/cups-private.h>
  26 #include <cups/md5-private.h>
  27 #include <fcntl.h>
  28 #include <grp.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31
  32 #ifndef WIN32
  33 #  include <unistd.h>
  34 #  include <signal.h>
  35 #endif /* !WIN32 */
  36
  37
  38 /*
  39  * Operations...
  40  */
  41
  42 #define ADD     0
  43 #define CHANGE  1
  44 #define DELETE  2
  45
  46
  47 /*
  48  * Local functions...
  49  */
  50
  51 static void     usage(FILE *fp) __attribute__((noreturn));
  52
  53
  54 /*
  55  * 'main()' - Add, change, or delete passwords from the MD5 password file.
  56  */
  57
  58 int                                     /* O - Exit status */
  59 main(int  argc,                         /* I - Number of command-line arguments */
  60      char *argv[])                      /* I - Command-line arguments */
  61 {
  62   int           i;                      /* Looping var */
  63   char          *opt;                   /* Option pointer */
  64   const char    *username;              /* Pointer to username */
  65   const char    *groupname;             /* Pointer to group name */
  66   int           op;                     /* Operation (add, change, delete) */
  67   const char    *passwd;                /* Password string */
  68   FILE          *infile,                /* Input file */
  69                 *outfile;               /* Output file */
  70   char          line[256],              /* Line from file */
  71                 userline[17],           /* User from line */
  72                 groupline[17],          /* Group from line */
  73                 md5line[33],            /* MD5-sum from line */
  74                 md5new[33];             /* New MD5 sum */
  75   char          passwdmd5[1024],        /* passwd.md5 file */
  76                 passwdold[1024],        /* passwd.old file */
  77                 passwdnew[1024];        /* passwd.tmp file */
  78   char          *newpass,               /* new password */
  79                 *oldpass;               /* old password */
  80   int           flag;                   /* Password check flags... */
  81   int           fd;                     /* Password file descriptor */
  82   int           error;                  /* Write error */
  83   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
  84   cups_lang_t   *lang;                  /* Language info */
  85 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  86   struct sigaction action;              /* Signal action */
  87 #endif /* HAVE_SIGACTION && !HAVE_SIGSET*/
  88
  89
  90   _cupsSetLocale(argv);
  91   lang = cupsLangDefault();
  92
  93  /*
  94   * Check to see if stdin, stdout, and stderr are still open...
  95   */
  96
  97   if (fcntl(0, F_GETFD, &i) ||
  98       fcntl(1, F_GETFD, &i) ||
  99       fcntl(2, F_GETFD, &i))
 100   {
 101    /*
 102     * No, return exit status 2 and don't try to send any output since
 103     * someone is trying to bypass the security on the server.
 104     */
 105
 106     return (2);
 107   }
 108
 109  /*
 110   * Find the server directory...
 111   */
 112
 113   snprintf(passwdmd5, sizeof(passwdmd5), "%s/passwd.md5", cg->cups_serverroot);
 114   snprintf(passwdold, sizeof(passwdold), "%s/passwd.old", cg->cups_serverroot);
 115   snprintf(passwdnew, sizeof(passwdnew), "%s/passwd.new", cg->cups_serverroot);
 116
 117  /*
 118   * Find the default system group...
 119   */
 120
 121   if (getgrnam(CUPS_DEFAULT_GROUP))
 122     groupname = CUPS_DEFAULT_GROUP;
 123   else
 124     groupname = "unknown";
 125
 126   endgrent();
 127
 128   username = NULL;
 129   op       = CHANGE;
 130
 131  /*
 132   * Parse command-line options...
 133   */
 134
 135   for (i = 1; i < argc; i ++)
 136     if (argv[i][0] == '-')
 137       for (opt = argv[i] + 1; *opt; opt ++)
 138         switch (*opt)
 139         {
 140           case 'a' : /* Add */
 141               op = ADD;
 142               break;
 143           case 'x' : /* Delete */
 144               op = DELETE;
 145               break;
 146           case 'g' : /* Group */
 147               i ++;
 148               if (i >= argc)
 149                 usage(stderr);
 150
 151               groupname = argv[i];
 152               break;
 153           case 'h' : /* Help */
 154               usage(stdout);
 155               break;
 156           default : /* Bad option */
 157               usage(stderr);
 158               break;
 159         }
 160     else if (!username)
 161       username = argv[i];
 162     else
 163       usage(stderr);
 164
 165  /*
 166   * See if we are trying to add or delete a password when we aren't logged in
 167   * as root...
 168   */
 169
 170   if (getuid() && getuid() != geteuid() && (op != CHANGE || username))
 171   {
 172     _cupsLangPuts(stderr,
 173                   _("lppasswd: Only root can add or delete passwords."));
 174     return (1);
 175   }
 176
 177  /*
 178   * Fill in missing info...
 179   */
 180
 181   if (!username)
 182     username = cupsUser();
 183
 184   oldpass = newpass = NULL;
 185
 186  /*
 187   * Obtain old and new password _before_ locking the database
 188   * to keep users from locking the file indefinitely.
 189   */
 190
 191   if (op == CHANGE && getuid())
 192   {
 193     if ((passwd = cupsGetPassword(_("Enter old password:"))) == NULL)
 194       return (1);
 195
 196     if ((oldpass = strdup(passwd)) == NULL)
 197     {
 198       _cupsLangPrintf(stderr,
 199                       _("lppasswd: Unable to copy password string: %s"),
 200                       strerror(errno));
 201       return (1);
 202     }
 203   }
 204
 205  /*
 206   * Now get the new password, if necessary...
 207   */
 208
 209   if (op != DELETE)
 210   {
 211     if ((passwd = cupsGetPassword(
 212             _cupsLangString(lang, _("Enter password:")))) == NULL)
 213       return (1);
 214
 215     if ((newpass = strdup(passwd)) == NULL)
 216     {
 217       _cupsLangPrintf(stderr,
 218                       _("lppasswd: Unable to copy password string: %s"),
 219                       strerror(errno));
 220       return (1);
 221     }
 222
 223     if ((passwd = cupsGetPassword(
 224             _cupsLangString(lang, _("Enter password again:")))) == NULL)
 225       return (1);
 226
 227     if (strcmp(passwd, newpass) != 0)
 228     {
 229       _cupsLangPuts(stderr,
 230                     _("lppasswd: Sorry, passwords don't match."));
 231       return (1);
 232     }
 233
 234    /*
 235     * Check that the password contains at least one letter and number.
 236     */
 237
 238     flag = 0;
 239
 240     for (passwd = newpass; *passwd; passwd ++)
 241       if (isdigit(*passwd & 255))
 242         flag |= 1;
 243       else if (isalpha(*passwd & 255))
 244         flag |= 2;
 245
 246    /*
 247     * Only allow passwords that are at least 6 chars, have a letter and
 248     * a number, and don't contain the username.
 249     */
 250
 251     if (strlen(newpass) < 6 || strstr(newpass, username) != NULL || flag != 3)
 252     {
 253       _cupsLangPuts(stderr, _("lppasswd: Sorry, password rejected."));
 254       _cupsLangPuts(stderr, _("Your password must be at least 6 characters "
 255                               "long, cannot contain your username, and must "
 256                               "contain at least one letter and number."));
 257       return (1);
 258     }
 259   }
 260
 261  /*
 262   * Ignore SIGHUP, SIGINT, SIGTERM, and SIGXFSZ (if defined) for the
 263   * remainder of the time so that we won't end up with bogus password
 264   * files...
 265   */
 266
 267 #ifndef WIN32
 268 #  if defined(HAVE_SIGSET)
 269   sigset(SIGHUP, SIG_IGN);
 270   sigset(SIGINT, SIG_IGN);
 271   sigset(SIGTERM, SIG_IGN);
 272 #    ifdef SIGXFSZ
 273   sigset(SIGXFSZ, SIG_IGN);
 274 #    endif /* SIGXFSZ */
 275 #  elif defined(HAVE_SIGACTION)
 276   memset(&action, 0, sizeof(action));
 277   action.sa_handler = SIG_IGN;
 278
 279   sigaction(SIGHUP, &action, NULL);
 280   sigaction(SIGINT, &action, NULL);
 281   sigaction(SIGTERM, &action, NULL);
 282 #    ifdef SIGXFSZ
 283   sigaction(SIGXFSZ, &action, NULL);
 284 #    endif /* SIGXFSZ */
 285 #  else
 286   signal(SIGHUP, SIG_IGN);
 287   signal(SIGINT, SIG_IGN);
 288   signal(SIGTERM, SIG_IGN);
 289 #    ifdef SIGXFSZ
 290   signal(SIGXFSZ, SIG_IGN);
 291 #    endif /* SIGXFSZ */
 292 #  endif
 293 #endif /* !WIN32 */
 294
 295  /*
 296   * Open the output file.
 297   */
 298
 299   if ((fd = open(passwdnew, O_WRONLY | O_CREAT | O_EXCL, 0400)) < 0)
 300   {
 301     if (errno == EEXIST)
 302       _cupsLangPuts(stderr, _("lppasswd: Password file busy."));
 303     else
 304       _cupsLangPrintf(stderr, _("lppasswd: Unable to open password file: %s"),
 305                       strerror(errno));
 306
 307     return (1);
 308   }
 309
 310   if ((outfile = fdopen(fd, "w")) == NULL)
 311   {
 312     _cupsLangPrintf(stderr, _("lppasswd: Unable to open password file: %s"),
 313                     strerror(errno));
 314
 315     unlink(passwdnew);
 316
 317     return (1);
 318   }
 319
 320   setbuf(outfile, NULL);
 321
 322  /*
 323   * Open the existing password file and create a new one...
 324   */
 325
 326   infile = fopen(passwdmd5, "r");
 327   if (infile == NULL && errno != ENOENT && op != ADD)
 328   {
 329     _cupsLangPrintf(stderr, _("lppasswd: Unable to open password file: %s"),
 330                     strerror(errno));
 331
 332     fclose(outfile);
 333
 334     unlink(passwdnew);
 335
 336     return (1);
 337   }
 338
 339  /*
 340   * Read lines from the password file; the format is:
 341   *
 342   *   username:group:MD5-sum
 343   */
 344
 345   error        = 0;
 346   userline[0]  = '\0';
 347   groupline[0] = '\0';
 348   md5line[0]   = '\0';
 349
 350   if (infile)
 351   {
 352     while (fgets(line, sizeof(line), infile) != NULL)
 353     {
 354       if (sscanf(line, "%16[^:]:%16[^:]:%32s", userline, groupline, md5line) != 3)
 355         continue;
 356
 357       if (strcmp(username, userline) == 0 &&
 358           strcmp(groupname, groupline) == 0)
 359         break;
 360
 361       if (fputs(line, outfile) == EOF)
 362       {
 363         _cupsLangPrintf(stderr,
 364                         _("lppasswd: Unable to write to password file: %s"),
 365                         strerror(errno));
 366         error = 1;
 367         break;
 368       }
 369     }
 370
 371     if (!error)
 372     {
 373       while (fgets(line, sizeof(line), infile) != NULL)
 374         if (fputs(line, outfile) == EOF)
 375         {
 376           _cupsLangPrintf(stderr,
 377                           _("lppasswd: Unable to write to password file: %s"),
 378                           strerror(errno));
 379           error = 1;
 380           break;
 381         }
 382     }
 383   }
 384
 385   if (op == CHANGE &&
 386       (strcmp(username, userline) || strcmp(groupname, groupline)))
 387   {
 388     _cupsLangPrintf(stderr,
 389                     _("lppasswd: user \"%s\" and group \"%s\" do not exist."),
 390                     username, groupname);
 391     error = 1;
 392   }
 393   else if (op != DELETE)
 394   {
 395     if (oldpass &&
 396         strcmp(httpMD5(username, "CUPS", oldpass, md5new), md5line) != 0)
 397     {
 398       _cupsLangPuts(stderr, _("lppasswd: Sorry, password doesn't match."));
 399       error = 1;
 400     }
 401     else
 402     {
 403       snprintf(line, sizeof(line), "%s:%s:%s\n", username, groupname,
 404                httpMD5(username, "CUPS", newpass, md5new));
 405       if (fputs(line, outfile) == EOF)
 406       {
 407         _cupsLangPrintf(stderr,
 408                         _("lppasswd: Unable to write to password file: %s"),
 409                         strerror(errno));
 410         error = 1;
 411       }
 412     }
 413   }
 414
 415  /*
 416   * Close the files...
 417   */
 418
 419   if (infile)
 420     fclose(infile);
 421
 422   if (fclose(outfile) == EOF)
 423     error = 1;
 424
 425  /*
 426   * Error out gracefully as needed...
 427   */
 428
 429   if (error)
 430   {
 431     _cupsLangPuts(stderr, _("lppasswd: Password file not updated."));
 432
 433     unlink(passwdnew);
 434
 435     return (1);
 436   }
 437
 438  /*
 439   * Save old passwd file
 440   */
 441
 442   unlink(passwdold);
 443   if (link(passwdmd5, passwdold) && errno != ENOENT)
 444   {
 445     _cupsLangPrintf(stderr,
 446                     _("lppasswd: failed to backup old password file: %s"),
 447                     strerror(errno));
 448     unlink(passwdnew);
 449     return (1);
 450   }
 451
 452  /*
 453   * Install new password file
 454   */
 455
 456   if (rename(passwdnew, passwdmd5) < 0)
 457   {
 458     _cupsLangPrintf(stderr, _("lppasswd: failed to rename password file: %s"),
 459                     strerror(errno));
 460     unlink(passwdnew);
 461     return (1);
 462   }
 463
 464   return (0);
 465 }
 466
 467
 468 /*
 469  * 'usage()' - Show program usage.
 470  */
 471
 472 static void
 473 usage(FILE *fp)         /* I - File to send usage to */
 474 {
 475   if (getuid())
 476     _cupsLangPuts(fp, _("Usage: lppasswd [-g groupname]"));
 477   else
 478     _cupsLangPuts(fp,
 479                   _("Usage: lppasswd [-g groupname] [username]\n"
 480                     "       lppasswd [-g groupname] -a [username]\n"
 481                     "       lppasswd [-g groupname] -x [username]"));
 482
 483   exit(1);
 484 }
 485
 486
 487 /*
 488  * End of "$Id$".
 489  */