Denis Vlasenko | dd5702d | 2008-03-19 23:15:55 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Ckeck user and group names for illegal characters |
| 4 | * |
| 5 | * Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it> |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| 8 | */ |
| 9 | |
| 10 | #include "libbb.h" |
| 11 | |
| 12 | /* To avoid problems, the username should consist only of |
| 13 | * letters, digits, underscores, periods, at signs and dashes, |
| 14 | * and not start with a dash (as defined by IEEE Std 1003.1-2001). |
| 15 | * For compatibility with Samba machine accounts $ is also supported |
| 16 | * at the end of the username. |
| 17 | */ |
| 18 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 19 | void FAST_FUNC die_if_bad_username(const char *name) |
Denis Vlasenko | dd5702d | 2008-03-19 23:15:55 +0000 | [diff] [blame] | 20 | { |
Denis Vlasenko | 104d544 | 2008-03-19 23:25:00 +0000 | [diff] [blame] | 21 | goto skip; /* 1st char being dash isn't valid */ |
Denis Vlasenko | dd5702d | 2008-03-19 23:15:55 +0000 | [diff] [blame] | 22 | do { |
Denis Vlasenko | 104d544 | 2008-03-19 23:25:00 +0000 | [diff] [blame] | 23 | if (*name == '-') |
| 24 | continue; |
| 25 | skip: |
| 26 | if (isalnum(*name) |
| 27 | || *name == '_' |
| 28 | || *name == '.' |
| 29 | || *name == '@' |
| 30 | || (*name == '$' && !*(name + 1)) |
| 31 | ) { |
| 32 | continue; |
| 33 | } |
| 34 | bb_error_msg_and_die("illegal character '%c'", *name); |
Denis Vlasenko | dd5702d | 2008-03-19 23:15:55 +0000 | [diff] [blame] | 35 | } while (*++name); |
| 36 | } |