1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * chpasswd.c
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4 | *
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5 | * Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
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6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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7 | */
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8 | #include "libbb.h"
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9 |
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10 | //usage:#define chpasswd_trivial_usage
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11 | //usage: IF_LONG_OPTS("[--md5|--encrypted]") IF_NOT_LONG_OPTS("[-m|-e]")
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12 | //usage:#define chpasswd_full_usage "\n\n"
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13 | //usage: "Read user:password from stdin and update /etc/passwd\n"
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14 | //usage: IF_LONG_OPTS(
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15 | //usage: "\n -e,--encrypted Supplied passwords are in encrypted form"
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16 | //usage: "\n -m,--md5 Use MD5 encryption instead of DES"
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17 | //usage: )
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18 | //usage: IF_NOT_LONG_OPTS(
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19 | //usage: "\n -e Supplied passwords are in encrypted form"
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20 | //usage: "\n -m Use MD5 encryption instead of DES"
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21 | //usage: )
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22 |
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23 | //TODO: implement -c ALGO
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24 |
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25 | #if ENABLE_LONG_OPTS
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26 | static const char chpasswd_longopts[] ALIGN1 =
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27 | "encrypted\0" No_argument "e"
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28 | "md5\0" No_argument "m"
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29 | ;
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30 | #endif
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31 |
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32 | #define OPT_ENC 1
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33 | #define OPT_MD5 2
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34 |
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35 | int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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36 | int chpasswd_main(int argc UNUSED_PARAM, char **argv)
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37 | {
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38 | char *name;
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39 | int opt;
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40 |
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41 | if (getuid() != 0)
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42 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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43 |
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44 | opt_complementary = "m--e:e--m";
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45 | IF_LONG_OPTS(applet_long_options = chpasswd_longopts;)
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46 | opt = getopt32(argv, "em");
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47 |
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48 | while ((name = xmalloc_fgetline(stdin)) != NULL) {
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49 | char *free_me;
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50 | char *pass;
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51 | int rc;
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52 |
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53 | pass = strchr(name, ':');
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54 | if (!pass)
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55 | bb_error_msg_and_die("missing new password");
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56 | *pass++ = '\0';
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57 |
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58 | xuname2uid(name); /* dies if there is no such user */
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59 |
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60 | free_me = NULL;
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61 | if (!(opt & OPT_ENC)) {
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62 | char salt[sizeof("$N$XXXXXXXX")];
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63 |
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64 | crypt_make_salt(salt, 1);
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65 | if (opt & OPT_MD5) {
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66 | salt[0] = '$';
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67 | salt[1] = '1';
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68 | salt[2] = '$';
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69 | crypt_make_salt(salt + 3, 4);
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70 | }
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71 | free_me = pass = pw_encrypt(pass, salt, 0);
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72 | }
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73 |
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74 | /* This is rather complex: if user is not found in /etc/shadow,
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75 | * we try to find & change his passwd in /etc/passwd */
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76 | #if ENABLE_FEATURE_SHADOWPASSWDS
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77 | rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
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78 | if (rc > 0) /* password in /etc/shadow was updated */
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79 | pass = (char*)"x";
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80 | if (rc >= 0)
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81 | /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
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82 | #endif
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83 | rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
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84 | /* LOGMODE_BOTH logs to syslog also */
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85 | logmode = LOGMODE_BOTH;
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86 | if (rc < 0)
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87 | bb_error_msg_and_die("an error occurred updating password for %s", name);
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88 | if (rc)
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89 | bb_info_msg("Password for '%s' changed", name);
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90 | logmode = LOGMODE_STDIO;
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91 | free(name);
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92 | free(free_me);
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93 | }
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94 | return EXIT_SUCCESS;
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95 | }
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