| /* vi: set sw=4 ts=4: */ |
| /* |
| * Check user and group names for illegal characters |
| * |
| * Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| /* To avoid problems, the username should consist only of |
| * letters, digits, underscores, periods, at signs and dashes, |
| * and not start with a dash (as defined by IEEE Std 1003.1-2001). |
| * For compatibility with Samba machine accounts $ is also supported |
| * at the end of the username. |
| */ |
| |
| void FAST_FUNC die_if_bad_username(const char *name) |
| { |
| /* 1st char being dash or dot isn't valid: */ |
| goto skip; |
| /* For example, name like ".." can make adduser |
| * chown "/home/.." recursively - NOT GOOD |
| */ |
| |
| do { |
| if (*name == '-' || *name == '.') |
| continue; |
| skip: |
| if (isalnum(*name) |
| || *name == '_' |
| || *name == '@' |
| || (*name == '$' && !name[1]) |
| ) { |
| continue; |
| } |
| bb_error_msg_and_die("illegal character '%c'", *name); |
| } while (*++name); |
| } |