5c5dc75641
On 2/19/23 18:09, David Mudrich wrote: > I am working on a RAM based Linux OS from source, and try to use > latest versions of all software. I found shadow needs libbsd's > readpassphrase(3) as superior alternative to getpass(3). While > considering if I a) include libbsd, or include libbsd's code of > readpassphrase(3) into shadow, found, that libbsd's readpassphrase(3) > never returns \n or \r > <https://cgit.freedesktop.org/libbsd/tree/src/readpassphrase.c> > line 122, while agetpass() uses a check for \n in agetpass.c line 108. > I assume it always fails. Indeed, it always failed. I made a mistake when writing agetpass(), assuming that readpassphrase(3) would keep newlines. > > I propose a check of len == PASS_MAX - 1, with false positive error for > exactly PASS_MAX - 1 long passwords. Instead, I added an extra byte to the allocation to allow a maximum password length of PASS_MAX (which is the maximum for getpass(3), which we're replacing. While doing that, I notice that my previous implementation also had another bug (minor): The maximum password length was PASS_MAX - 1 instead of PASS_MAX. That's also fixed in this commit. Reported-by: David Mudrich <dmudrich@gmx.de> Fixes: 155c9421b935 ("libmisc: agetpass(), erase_pass(): Add functions for getting passwords safely") Cc: Iker Pedrosa <ipedrosa@redhat.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
shadow-utils
Introduction
The shadow-utils package includes the necessary programs for converting UNIX password files to the shadow password format, plus programs for managing user and group accounts. The pwconv command converts passwords to the shadow password format. The pwunconv command unconverts shadow passwords and generates a passwd file (a standard UNIX password file). The pwck command checks the integrity of password and shadow files. The lastlog command prints out the last login times for all users. The useradd, userdel, and usermod commands are used for managing user accounts. The groupadd, groupdel, and groupmod commands are used for managing group accounts.
Sites
Contacts
There are several ways to contact us:
- the general discussion mailing list
- the #shadow IRC channel on libera.chat:
- irc://irc.libera.chat/shadow
Mailing archives
- the general discussion mailing list archive
- the commit mailing list archive, only used for historical purposes
Authors and maintainers
Authors and maintainers are listed in AUTHORS.md.