LXR toybox/toys/other/mkpasswd.c

   1/* mkpasswd.c - encrypt the given passwd using salt
   2 *
   3 * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
   4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
   5 *
   6 * No Standard
   7
   8USE_MKPASSWD(NEWTOY(mkpasswd, ">2S:m:P#=0<0", TOYFLAG_USR|TOYFLAG_BIN))
   9
  10config MKPASSWD
  11  bool "mkpasswd"
  12  default y
  13  depends on !TOYBOX_ON_ANDROID
  14  help
  15    usage: mkpasswd [-P FD] [-m TYPE] [-S SALT] [PASSWORD] [SALT]
  16
  17    Crypt PASSWORD using crypt(3)
  18
  19    -P FD       Read password from file descriptor FD
  20    -m TYPE     Encryption method (des, md5, sha256, or sha512; default is des)
  21    -S SALT
  22*/
  23
  24#define FOR_mkpasswd
  25#include "toys.h"
  26
  27GLOBALS(
  28  long P;
  29  char *m, *S;
  30)
  31
  32void mkpasswd_main(void)
  33{
  34  char salt[MAX_SALT_LEN] = {0,};
  35  int i;
  36
  37  if (!TT.m) TT.m = "des";
  38  if (toys.optc == 2) {
  39    if (TT.S) error_exit("duplicate salt");
  40    TT.S = toys.optargs[1];
  41  }
  42
  43  if (-1 == (i = get_salt(salt, TT.m))) error_exit("bad -m");
  44  if (TT.S) {
  45    char *s = TT.S;
  46
  47    // In C locale, isalnum() means [A-Za-Z0-0]
  48    while (isalnum(*s) || *s == '.' || *s == '/') s++;
  49    if (*s) error_exit("salt not in [./A-Za-z0-9]");
  50
  51    snprintf(salt+i, sizeof(salt)-i, "%s", TT.S);
  52  }
  53
  54  // Because read_password() doesn't have an fd argument
  55  if (TT.P) {
  56    if (dup2(TT.P, 0) == -1) perror_exit("fd");
  57    close(TT.P);
  58  }
  59
  60  // If we haven't got a password on the command line, read it from tty or FD
  61  if (!*toys.optargs) {
  62    // Prompt and read interactively?
  63    if (isatty(0)) {
  64      if (read_password(toybuf, sizeof(toybuf), "Password: ")) 
  65        perror_exit("password read failed");
  66    } else {
  67      for (i = 0; i<sizeof(toybuf)-1; i++) {
  68        if (!xread(0, toybuf+i, 1)) break;
  69        if (toybuf[i] == '\n' || toybuf[i] == '\r') break;
  70      }
  71      toybuf[i] = 0;
  72    }
  73  }
  74
  75  // encrypt & print the password
  76  xprintf("%s\n",crypt(*toys.optargs ? *toys.optargs : toybuf, salt));
  77}
  78