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annotate toys/pending/mkpasswd.c @ 1091:c4d4a6e7473f draft

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useradd, groupadd, and mkpasswd submitted by Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Wed, 16 Oct 2013 20:41:56 -0500
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children 63db77909fc8
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1091
c4d4a6e7473f useradd, groupadd, and mkpasswd submitted by Ashwini Sharma.
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1 /* mkpasswd.c - encrypt the given passwd using salt
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2 *
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3 * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
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4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
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5 *
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6 * No Standard
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7
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8 USE_MKPASSWD(NEWTOY(mkpasswd, ">2S:m:P#=0<0", TOYFLAG_USR|TOYFLAG_BIN))
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9
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10 config MKPASSWD
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11 bool "mkpasswd"
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12 default n
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13 help
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14 usage: mkpasswd [OPTIONS] [PASSWORD] [SALT]
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15
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16 Crypt PASSWORD using crypt(3)
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17
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18 -P N Read password from fd N
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19 -m TYPE Encryption method, when TYPE='help', then show the methods available
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20 -S SALT
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21 */
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22
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23 #define FOR_mkpasswd
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24 #include "toys.h"
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25 #include "lib/xregcomp.h"
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26
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27 GLOBALS(
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28 long pfd;
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29 char *method;
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30 char *salt;
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31 )
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32
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33
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34 /*
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35 * validate the salt provided by user.
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36 * the allowed character set for salt is [./A-Za-z0-9]
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37 */
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38 static void is_salt_valid(char *salt)
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39 {
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40 regex_t rp;
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41 regmatch_t rm[1];
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42 char *regex = "[./A-Za-z0-9]*"; //salt REGEX
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43
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44 xregcomp(&rp, regex, REG_NEWLINE);
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45
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46 /* compare string against pattern -- remember that patterns
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47 are anchored to the beginning of the line */
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48 if (regexec(&rp, salt, 1, rm, 0) == 0 && rm[0].rm_so == 0
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49 && rm[0].rm_eo == strlen(salt))
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50 return;
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51
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52 error_exit("salt should be in character set [./A-Za-z0-9]");
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53 }
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54
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55 void mkpasswd_main(void)
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56 {
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57 int offset = 0;
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58 char salt[MAX_SALT_LEN] = {0,};
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59
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60 if (!(toys.optflags & FLAG_m)) TT.method = "des";
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61 else if (!strcmp(TT.method, "help")) {
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62 xprintf("Available encryption methods are:\n"
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63 " des\n md5\n sha256\n sha512\n");
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64 return;
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65 }
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66 // If arguments are there, then the second argument is Salt, can be NULL also
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67 if ((toys.optc == 2) && !(toys.optflags & FLAG_S)) TT.salt = toys.optargs[1];
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68
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69 offset= get_salt(salt, TT.method);
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70 if (offset == -1) error_exit("unknown encryption method");
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71 if (TT.salt) {
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72 is_salt_valid(TT.salt);
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73 snprintf(salt + offset, MAX_SALT_LEN - offset, "%s", TT.salt);
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74 }
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75
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76 if (toys.optflags & FLAG_P) {
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77 if (dup2(TT.pfd, STDIN_FILENO) == -1) perror_exit("fd");
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78 close(TT.pfd);
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79 }
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80
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81 if (!toys.optc) {
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82 if (isatty(STDIN_FILENO)) {
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83 if (read_password(toybuf, sizeof(toybuf), "Password: "))
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84 perror_exit("password read failed");
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85 } else {
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86 // read from the given FD
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87 int i = 0;
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88 while (1) {
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89 int ret = read(0, &toybuf[i], 1);
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90 if ( ret < 0 ) perror_exit("password read failed");
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91 else if (ret == 0 || toybuf[i] == '\n' || toybuf[i] == '\r' ||
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92 sizeof(toybuf) == i+1) {
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93 toybuf[i] = '\0';
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94 break;
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95 }
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96 i++;
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97 }
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98 }
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99 } else snprintf(toybuf, sizeof(toybuf), "%s", toys.optargs[0]);
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100
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101 // encrypt & print the password
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102 xprintf("%s\n",crypt(toybuf, salt));
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103 }