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 | //config:config CHPASSWD
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9 | //config: bool "chpasswd"
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10 | //config: default y
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11 | //config: help
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12 | //config: Reads a file of user name and password pairs from standard input
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13 | //config: and uses this information to update a group of existing users.
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14 | //config:
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15 | //config:config FEATURE_DEFAULT_PASSWD_ALGO
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16 | //config: string "Default password encryption method (passwd -a, cryptpw -m parameter)"
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17 | //config: default "des"
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18 | //config: depends on PASSWD || CRYPTPW
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19 | //config: help
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20 | //config: Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512".
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21 |
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22 | //applet:IF_CHPASSWD(APPLET(chpasswd, BB_DIR_USR_SBIN, BB_SUID_DROP))
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23 |
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24 | //kbuild:lib-$(CONFIG_CHPASSWD) += chpasswd.o
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25 |
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26 | //usage:#define chpasswd_trivial_usage
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27 | //usage: IF_LONG_OPTS("[--md5|--encrypted|--crypt-method]") IF_NOT_LONG_OPTS("[-m|-e|-c]")
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28 | //usage:#define chpasswd_full_usage "\n\n"
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29 | //usage: "Read user:password from stdin and update /etc/passwd\n"
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30 | //usage: IF_LONG_OPTS(
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31 | //usage: "\n -e,--encrypted Supplied passwords are in encrypted form"
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32 | //usage: "\n -m,--md5 Use MD5 encryption instead of DES"
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33 | //usage: "\n -c,--crypt-method Use the specified method to encrypt the passwords"
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34 | //usage: )
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35 | //usage: IF_NOT_LONG_OPTS(
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36 | //usage: "\n -e Supplied passwords are in encrypted form"
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37 | //usage: "\n -m Use MD5 encryption instead of DES"
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38 | //usage: "\n -c Use the specified method to encrypt the passwords"
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39 | //usage: )
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40 |
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41 | #include "libbb.h"
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42 |
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43 | #if ENABLE_LONG_OPTS
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44 | static const char chpasswd_longopts[] ALIGN1 =
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45 | "encrypted\0" No_argument "e"
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46 | "md5\0" No_argument "m"
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47 | "crypt-method\0" Required_argument "c"
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48 | ;
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49 | #endif
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50 |
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51 | #define OPT_ENC 1
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52 | #define OPT_MD5 2
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53 |
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54 | int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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55 | int chpasswd_main(int argc UNUSED_PARAM, char **argv)
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56 | {
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57 | char *name;
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58 | const char *algo = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
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59 | int opt;
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60 |
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61 | if (getuid() != 0)
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62 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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63 |
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64 | opt_complementary = "m--ec:e--mc:c--em";
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65 | IF_LONG_OPTS(applet_long_options = chpasswd_longopts;)
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66 | opt = getopt32(argv, "emc:", &algo);
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67 |
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68 | while ((name = xmalloc_fgetline(stdin)) != NULL) {
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69 | char *free_me;
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70 | char *pass;
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71 | int rc;
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72 |
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73 | pass = strchr(name, ':');
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74 | if (!pass)
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75 | bb_error_msg_and_die("missing new password");
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76 | *pass++ = '\0';
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77 |
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78 | xuname2uid(name); /* dies if there is no such user */
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79 |
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80 | free_me = NULL;
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81 | if (!(opt & OPT_ENC)) {
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82 | char salt[MAX_PW_SALT_LEN];
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83 |
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84 | if (opt & OPT_MD5) {
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85 | /* Force MD5 if the -m flag is set */
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86 | algo = "md5";
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87 | }
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88 |
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89 | crypt_make_pw_salt(salt, algo);
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90 | free_me = pass = pw_encrypt(pass, salt, 0);
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91 | }
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92 |
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93 | /* This is rather complex: if user is not found in /etc/shadow,
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94 | * we try to find & change his passwd in /etc/passwd */
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95 | #if ENABLE_FEATURE_SHADOWPASSWDS
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96 | rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
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97 | if (rc > 0) /* password in /etc/shadow was updated */
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98 | pass = (char*)"x";
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99 | if (rc >= 0)
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100 | /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
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101 | #endif
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102 | rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
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103 | /* LOGMODE_BOTH logs to syslog also */
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104 | logmode = LOGMODE_BOTH;
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105 | if (rc < 0)
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106 | bb_error_msg_and_die("an error occurred updating password for %s", name);
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107 | if (rc)
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108 | bb_error_msg("password for '%s' changed", name);
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109 | logmode = LOGMODE_STDIO;
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110 | free(name);
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111 | free(free_me);
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112 | }
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113 | return EXIT_SUCCESS;
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114 | }
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