| 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 | #if ENABLE_LONG_OPTS |
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| 24 | static const char chpasswd_longopts[] ALIGN1 = |
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| 25 | "encrypted\0" No_argument "e" |
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| 26 | "md5\0" No_argument "m" |
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| 27 | ; |
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| 28 | #endif |
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| 29 | |
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| 30 | #define OPT_ENC 1 |
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| 31 | #define OPT_MD5 2 |
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| 32 | |
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| 33 | int chpasswd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
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| 34 | int chpasswd_main(int argc UNUSED_PARAM, char **argv) |
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| 35 | { |
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| 36 | char *name, *pass; |
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| 37 | char salt[sizeof("$N$XXXXXXXX")]; |
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| 38 | int opt, rc; |
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| 39 | |
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| 40 | if (getuid() != 0) |
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| 41 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
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| 42 | |
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| 43 | opt_complementary = "m--e:e--m"; |
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| 44 | IF_LONG_OPTS(applet_long_options = chpasswd_longopts;) |
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| 45 | opt = getopt32(argv, "em"); |
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| 46 | |
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| 47 | while ((name = xmalloc_fgetline(stdin)) != NULL) { |
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| 48 | pass = strchr(name, ':'); |
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| 49 | if (!pass) |
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| 50 | bb_error_msg_and_die("missing new password"); |
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| 51 | *pass++ = '\0'; |
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| 52 | |
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| 53 | xuname2uid(name); /* dies if there is no such user */ |
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| 54 | |
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| 55 | if (!(opt & OPT_ENC)) { |
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| 56 | crypt_make_salt(salt, 1); |
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| 57 | if (opt & OPT_MD5) { |
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| 58 | salt[0] = '$'; |
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| 59 | salt[1] = '1'; |
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| 60 | salt[2] = '$'; |
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| 61 | crypt_make_salt(salt + 3, 4); |
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| 62 | } |
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| 63 | pass = pw_encrypt(pass, salt, 0); |
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| 64 | } |
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| 65 | |
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| 66 | /* This is rather complex: if user is not found in /etc/shadow, |
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| 67 | * we try to find & change his passwd in /etc/passwd */ |
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| 68 | #if ENABLE_FEATURE_SHADOWPASSWDS |
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| 69 | rc = update_passwd(bb_path_shadow_file, name, pass, NULL); |
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| 70 | if (rc > 0) /* password in /etc/shadow was updated */ |
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| 71 | pass = (char*)"x"; |
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| 72 | if (rc >= 0) |
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| 73 | /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */ |
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| 74 | #endif |
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| 75 | rc = update_passwd(bb_path_passwd_file, name, pass, NULL); |
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| 76 | /* LOGMODE_BOTH logs to syslog also */ |
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| 77 | logmode = LOGMODE_BOTH; |
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| 78 | if (rc < 0) |
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| 79 | bb_error_msg_and_die("an error occurred updating password for %s", name); |
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| 80 | if (rc) |
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| 81 | bb_info_msg("Password for '%s' changed", name); |
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| 82 | logmode = LOGMODE_STDIO; |
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| 83 | free(name); |
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| 84 | if (!(opt & OPT_ENC)) |
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| 85 | free(pass); |
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| 86 | } |
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| 87 | return EXIT_SUCCESS; |
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| 88 | } |
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