diff options
| -rw-r--r-- | libbb/die_if_bad_username.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libbb/die_if_bad_username.c b/libbb/die_if_bad_username.c new file mode 100644 index 0000000..251b1f0 --- /dev/null +++ b/libbb/die_if_bad_username.c @@ -0,0 +1,34 @@ +/* vi: set sw=4 ts=4: */ +/* + * Ckeck 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 die_if_bad_username(const char *name) +{ + int i = 0; + + do { + if (!isalnum(*name) + && !(*name == '_') + && !(*name == '.') + && !(*name == '@') + && !(*name == '-' && i) + && !(*name == '$' && !*(name + 1)) + ) + bb_error_msg_and_die("illegal character '%c'", *name); + i++; + } while (*++name); +} |