Commit Graph

57 Commits

Author SHA1 Message Date
Alejandro Colomar
709e6b4497 Add stpecpy()
strncat(3), strlcpy(3), and many other functions are often misused for
catenating strings, when they should never be used for that.  strlcat(3)
is good.  However, there's no equivalent to strlcat(3) similar to
snprintf(3).  Let's add stpecpy(), which is similar to strlcat(3), but
it is also the only function compatible with stpeprintf(), which makes
it more useful than strlcat(3).

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-02-16 11:29:33 +01:00
Alejandro Colomar
e0e9e57a72 Add mempcpy(3)
We'll use it for implementing stpecpy(), and may be interesting to have
it around.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-02-16 11:29:33 +01:00
Alejandro Colomar
7e213cfb50 Add stpeprintf()
[v]stpeprintf() are similar to [v]snprintf(3), but they allow chaining.
[v]snprintf(3) are very dangerous for catenating strings, since the
obvious ways to do it invoke Undefined Behavior, and the ways that avoid
UB are very error-prone.

Cc: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-02-16 11:29:33 +01:00
Alejandro Colomar
0712b236c3 Add bit manipulation functions
We do need the unoptimized version of csrand_uniform() for high values
of `n`, since the optimized version depends on having __int128, and it's
not available on several platforms, including ARMv7, IA32, and MK68k.

This reverts commit 848f53c1d3c1362c86d3baab6906e1e4419d2634; however,
I applied some tweaks to the reverted commit.

Reported-by: Adam Sampson <ats@offog.org>
Cc: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-30 18:24:15 +01:00
Alejandro Colomar
848f53c1d3 Revert "Add bit manipulation functions"
Now that we optimized csrand_uniform(), we don't need these functions.

This reverts commit 7c8fe291b1260e127c10562bfd7616961013730f.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-27 21:48:37 -06:00
Alejandro Colomar
4a56f2baab Add bit manipulation functions
These functions implement bit manipulation APIs, which will be added to
C23, so that in the far future, we will be able to replace our functions
by the standard ones, just by adding the stdc_ prefix, and including
<stdbit.h>.

However, we need to avoid UB for an input of 0, so slightly deviate from
C23, and use a different name (with _wrap) for distunguishing our API
from the standard one.

Cc: Joseph Myers <joseph@codesourcery.com>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-27 21:48:37 -06:00
Alejandro Colomar
be1f4f7972 Move csrand() to a new file csrand.c
A set of APIs similar to arc4random(3) is complex enough to deserve its
own file.

Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Cristian Rodríguez <crrodriguez@opensuse.org>
Cc: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: Björn Esser <besser82@fedoraproject.org>
Cc: Yann Droneaud <ydroneaud@opteya.com>
Cc: Joseph Myers <joseph@codesourcery.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-27 21:48:37 -06:00
Alejandro Colomar
b2bed465e8 Use getnameinfo(3) instead of our own equivalent
I didn't know getnameinfo(3) existed, so I implemented it, or something
similar to it called inet_sockaddr2str().  Let's use the standard API.

Link: <https://inbox.sourceware.org/libc-alpha/0f25d60f-f183-b518-b6c1-6d46aa63ee57@gmail.com/T/>
Link: <https://stackoverflow.com/a/42190913/6872717>
Link: <https://github.com/shadow-maint/shadow/pull/617>
Link: <https://software.codidact.com/posts/287748>
Cc: Zack Weinberg <zack@owlfolio.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-20 10:23:03 -06:00
Alejandro Colomar
bb3a89577c Add inet_sockaddr2str() to wrap inet_ntop(3)
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2023-01-02 08:20:43 +01:00
Guillem Jover
2a5b8810bb agetpass: Hook into build-system
Signed-off-by: Guillem Jover <guillem@hadrons.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2022-12-05 10:47:19 +01:00
Alex Colomar
155c9421b9 libmisc: agetpass(), erase_pass(): Add functions for getting passwords safely
There are several issues with getpass(3).

Many implementations of it share the same issues that the infamous
gets(3).  In glibc it's not so terrible, since it's a wrapper
around getline(3).  But it still has an important bug:

If the password is long enough, getline(3) will realloc(3) memory,
and prefixes of the password will be laying around in some
deallocated memory.

See the getpass(3) manual page for more details, and especially
the commit that marked it as deprecated, which links to a long
discussion in the linux-man@ mailing list.

So, readpassphrase(3bsd) is preferrable, which is provided by
libbsd on GNU systems.  However, using readpassphrase(3) directly
is a bit verbose, so we can write our own wrapper with a simpler
interface similar to that of getpass(3).

One of the benefits of writing our own interface around
readpassphrase(3) is that we can hide there any checks that should
be done always and which would be error-prone to repeat every
time.  For example, check that there was no truncation in the
password.

Also, use malloc(3) to get the buffer, instead of using a global
buffer.  We're not using a multithreaded program (and it wouldn't
make sense to do so), but it's nice to know that the visibility of
our passwords is as limited as possible.

erase_pass() is a clean-up function that handles all clean-up
correctly, including zeroing the entire buffer, and then
free(3)ing the memory.  By using [[gnu::malloc(erase_pass)]], we
make sure that we don't leak the buffers in any case, since the
compiler will be able to enforce clean up.

Link: <https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit?id=7ca189099d73bde954eed2d7fc21732bcc8ddc6b>
Reported-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2022-12-05 10:47:19 +01:00
Alejandro Colomar
355ad6a9e0 Have a single definition of date_to_str()
PARAMETERS:

According to the C2x charter, I reordered the parameters 'size'
and 'buf' from previously existing date_to_str() definitions.

C2x charter:
> 15. Application Programming Interfaces (APIs) should be
> self-documenting when possible.  In particular, the order of
> parameters in function declarations should be arranged such that
> the size of an array appears before the array.  The purpose is to
> allow Variable-Length Array (VLA) notation to be used.  This not
> only makes the code's purpose clearer to human readers, but also
> makes static analysis easier.  Any new APIs added to the Standard
> should take this into consideration.

I used 'long' for the date parameter, as some uses of the function
need to pass a negative value meaning "never".

FUNCTION BODY:

I didn't check '#ifdef HAVE_STRFTIME', which old definitions did,
since strftime(3) is guaranteed by the C89 standard, and all of
the conversion specifiers that we use are also specified by that
standard, so we don't need any extensions at all.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
2021-12-26 18:55:39 +01:00
Serge Hallyn
537b8cd90b Fix out of tree builds with respect to libsubid includes
There's a better way to do this, and I hope to clean that up,
but this fixes out of tree builds for me right now.

Closes #386

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-07-23 17:51:13 -05:00
Serge Hallyn
514c1328b6 try again to fix libmisc sharing problem
Issue #297 reported seeing

*** Warning: Linking the shared library libsubid.la against the
*** static library ../libmisc/libmisc.a is not portable!

which commit b5fb1b38ee was supposed
to fix.  But a few commits later it's back.  So try to fix it
in the way the bug reporter suggested.  This broke builds some
other ways, namely a few missing library specifications, so add
those.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2021-04-11 17:42:04 -05:00
Thorsten Kukuk
b52ce71c27 Add support for a vendor directory and libeconf
With this, it is possible for Linux distributors to store their
supplied default configuration files somewhere below /usr, while
/etc only contains the changes made by the user. The new option
--enable-vendordir defines where the shadow suite should additional
look for login.defs if this file is not in /etc.
libeconf is a key/value configuration file reading library, which
handles the split of configuration files in different locations
and merges them transparently for the application.
2019-10-05 22:17:49 -05:00
Adam Majer
50b23584d7 Add autotools support for BtrFS option
Feature is enabled by default, if headers are available. It can be
turned off explictly.
2019-05-03 22:38:23 -07:00
Adam Majer
c1d36a8acb Add support for btrfs subvolumes for user homes
new switch added to useradd command, --btrfs-subvolume-home. When
specified *and* the filesystem is detected as btrfs, it will create a
subvolume for user's home instead of a plain directory. This is done via
`btrfs subvolume` command.  Specifying the new switch while trying to
create home on non-btrfs will result in an error.

userdel -r will handle and remove this subvolume transparently via
`btrfs subvolume` command. Previosuly this failed as you can't rmdir a
subvolume.

usermod, when moving user's home across devices, will detect if the home
is a subvolume and issue an error messages instead of copying it. Moving
user's home (as subvolume) on same btrfs works transparently.
2019-05-03 22:38:23 -07:00
fariouche
54551c7d6e Merge remote-tracking branch 'upstream/master' 2018-03-28 21:11:36 +02:00
fariouche
acaed3deab upstream merge 2018-01-23 23:10:19 +01:00
Josh Soref
74fcf6f28d spelling: interactive 2017-10-22 20:24:32 +00:00
Chris Lamb
cb610d54b4 Make the sp_lstchg shadow field reproducible.
The third field in the /etc/shadow file (sp_lstchg) contains the date of
the last password change expressed as the number of days since Jan 1, 1970.
As this is a relative time, creating a user today will result in:

   username:17238:0:99999:7:::

whilst creating the same user tomorrow will result in:

    username:17239:0:99999:7:::

This has an impact for the Reproducible Builds[0] project where we aim to
be independent of as many elements the build environment as possible,
including the current date.

This patch changes the behaviour to use the SOURCE_DATE_EPOCH[1]
environment variable (instead of Jan 1, 1970) if valid.

 [0] https://reproducible-builds.org/
 [1] https://reproducible-builds.org/specs/source-date-epoch/

Signed-off-by: Chris Lamb <lamby@debian.org>
2017-04-10 22:29:21 +01:00
fariouche
b6b2c756c9 add --prefix option 2017-03-01 22:51:09 +01:00
W. Trevor King
c07397695a */Makefile.am: Replace INCLUDES with AM_CPPFLAGS
Catch up with Automake's [1], which was part of v1.6b, cut 2002-07-28
[2].  Avoids:

  $ autoreconf -v -f --install
  ...
  libmisc/Makefile.am:4: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
  ...
  src/Makefile.am:10: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
  ...

Consolidating with the earlier AM_CPPFLAGS avoids:

  $ autoreconf -v -f --install
  src/Makefile.am:72: warning: AM_CPPFLAGS multiply defined in condition TRUE ...
  src/Makefile.am:10: ... 'AM_CPPFLAGS' previously defined here
  autoreconf-2.69: Leaving directory `.'

[1]: http://git.savannah.gnu.org/cgit/automake.git/commit/?id=1415d22f6203206bc393fc4ea233123ba579222d
     Summary: automake.in (generate_makefile): Suggest using AM_CPPFLAGS instead of INCLUDES
     Date: 2002-07-09
[2]: http://git.savannah.gnu.org/cgit/automake.git/tag/?id=Release-1-6b
2016-04-29 17:30:18 -07:00
Eric W. Biederman
673c2a6f9a newuidmap,newgidmap: New suid helpers for using subordinate uids and gids
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
2013-08-05 10:08:46 -05:00
Eric W. Biederman
a8f26262cf Implement find_new_sub_uids find_new_sub_gids
Functions for finding new subordinate uid and gids ranges for use
with useradd.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2013-08-05 10:08:45 -05:00
nekral-guest
29050eadb5 * NEWS, src/userdel.c, man/userdel.8.xml: Add option -Z/--selinux-user.
* libmisc/system.c, lib/prototypes.h, libmisc/Makefile.am: Removed
	safe_system().
	* lib/selinux.c, po/POTFILES.in, lib/prototypes.h,
	lib/Makefile.am: Added helper functions for semanage.
	* README, src/useradd.c, src/usermod.c, src/userdel.c,
	configure.in: Use libsemanage instead of semanage.
2011-11-17 21:51:07 +00:00
nekral-guest
0b5574c28a * lib/prototypes.h, libmisc/Makefile.am, libmisc/root_flag.c,
po/POTFILES.in: Add process_root_flag() to process the --root
	option and chroot so that the chroot config is used and changes
	are applied to the chroot.
2011-11-06 18:37:19 +00:00
nekral-guest
d7fa77f03b * lib/groupio.c, lib/sgroupio.c, lib/shadowio.c, lib/pwio.c: Check
entry validity before commits to databases.
	* libmisc/fields.c, libmisc/Makefile.am, lib/fields.c,
	lib/Makefile.am, po/POTFILES.in: fields.c moved from libmisc to
	lib.
2011-02-16 20:32:16 +00:00
nekral-guest
dc0947da78 * po/POTFILES.in, libmisc/Makefile.am, lib/prototypes.h,
libmisc/remove_tree.c, libmisc/copydir.c: Split remove_tree()
	outside of copydir.c to avoid linking against libacl or libattr.
2010-03-30 21:54:29 +00:00
nekral-guest
4a4549c49b * src/userdel.c, libmisc/user_busy.c, libmisc/Makefile.am,
lib/prototypes.h: Move user_busy() to libmisc/user_busy.c.
	* NEWS, libmisc/user_busy.c: On Linux, do not check if an user is
	logged in with utmp, but check if the user is running some
	processes. If not on Linux, continue to search for an utmp record,
	but make sure the process recorded in the utmp entry is still
	running.
2009-05-18 18:32:17 +00:00
nekral-guest
d1534c53f7 * libmisc/non_interactive_pam_conv.c,
libmisc/pam_pass_non_interractive.c, libmisc/Makefile.am: Renamed.
	* libmisc/pam_pass_non_interractive.c, lib/prototypes.h:
	non_interactive_password and non_interactive_pam_conv do not need
	to be externally visible.
	* libmisc/pam_pass_non_interractive.c: Added declaration of
	ni_conv.
	* libmisc/pam_pass_non_interractive.c: Only compile ifdef USE_PAM.
	* libmisc/pam_pass_non_interractive.c, lib/prototypes.h:
	Added do_pam_passwd_non_interractive().
	* src/chpasswd.c: Use do_pam_passwd_non_interractive().
2009-05-09 13:15:25 +00:00
nekral-guest
a1591f77e8 * libmisc/Makefile.am, lib/prototypes.h,
libmisc/non_interactive_pam_conv.c: Added
	non_interactive_pam_conv() and non_interactive_password.
2009-04-28 20:07:24 +00:00
nekral-guest
8d136297c4 * NEWS, src/useradd.c, man/useradd.8.xml: add -Z option to map
SELinux user for user's login.
	* NEWS, src/usermod.c, man/usermod.8.xml: Likewise.
	* libmisc/system.c, libmisc/Makefile.am, lib/prototypes.h: Added
	safe_system(). Used to run semanage.
	* lib/prototypes.h, libmisc/copydir.c: Make a
	selinux_file_context() an extern function.
	* libmisc/copydir.c: Reset SELinux to create files with default
	contexts at the end of copy_tree().
	* NEWS, src/userdel.c: Delete the SELinux user mapping for user's
	login.
2009-04-11 15:34:10 +00:00
nekral-guest
84f5ca951c * lib/getdef.c: Use getlong instead of strtol/strtoul.
* libmisc/getlong, lib/getlong.c, libmisc/Makefile.am,
	lib/Makefile.am: getlong.c moved from libmisc/ to lib/.
2009-04-10 22:35:26 +00:00
nekral-guest
77459dc27d * src/useradd.c, src/usermod.c, libmisc/getgr_nam_gid.c,
libmisc/Makefile.am, lib/prototypes.h: Moved getgr_nam_gid() from
	src/useradd.c and src/usermod.c to libmisc/getgr_nam_gid.c.
2009-04-10 22:34:10 +00:00
nekral-guest
a1dd26d2d6 * libmisc/get_gid.c, libmisc/get_uid.c, libmisc/Makefile.am,
lib/get_gid.c, lib/get_uid.c, lib/Makefile.am: get_uid.c and
	get_gid.c moved from libmisc/ to lib/.
2009-03-21 20:24:37 +00:00
nekral-guest
0e2a3979f4 * libmisc/get_gid.c, libmisc/get_uid.c, libmisc/Makefile.am,
lib/prototypes.h: Added get_uid() and get_gid() to parse user and
	group IDs.
2009-03-08 20:26:56 +00:00
nekral-guest
5b8ff14caf * libmisc/audit_help.c: Added audit_logger_message() to log
messages not related to an account.
	* lib/prototypes.h, libmisc/cleanup.c, libmisc/cleanup_group.c,
	libmisc/cleanup_user.c, libmisc/Makefile.am: Added stack of
	cleanup functions to be executed on exit.
	* NEWS, src/groupadd.c, src/groupdel.c, src/groupmod.c: Only
	report success to audit and syslog when the changes are committed
	to the system. Do not log failure for on-memory changes to audit
	or syslog. Make sure failures and inconsistencies will be reported
	in case of unexpected failures (e.g. malloc failures). Only
	specify an audit message if it is not implicitly implied by the
	type argument. Removed fail_exit (replaced by atexit(do_cleanups)).
2008-12-22 21:52:43 +00:00
nekral-guest
e1307ea789 * libmisc/find_new_ids.c, libmisc/find_new_gid.c,
libmisc/find_new_uid.c, libmisc/Makefile.am, lib/prototypes.h:
	Split find_new_ids.c into find_new_gid.c and find_new_uid.c to
	ease the description of login.defs variables in the different
	tools.
2008-06-15 18:33:52 +00:00
nekral-guest
b8c5483b85 * libmisc/Makefile.am, libmisc/getrange.c: Added function to parse
a range (useful for lastlog).
2008-06-14 21:01:11 +00:00
nekral-guest
aed929ae90 Add libmisc/find_new_ids.c to the sources of the libmisc library. 2008-02-03 16:57:21 +00:00
nekral-guest
fd970ab62c Merge Debian's patch 466_fflush-prompt
* libmisc/Makefile.am, lib/prototypes.h, libmisc/yesno.c, src/grpck.c,
	src/pwck.c: move yes_or_no() from grpck/pwck to a separate
	libmisc/yesno.c (with a read_only argument).
	* libmisc/fields.c, libmisc/yesno.c: Make sure stdout is flushed before
	reading the user's answer.
2007-12-26 16:50:38 +00:00
nekral-guest
add1c18b2e * src/chpasswd.c: Added crypt method: NONE.
* src/chpasswd.c: Added --sha-rounds to the usage().
* libmisc/Makefile.am, libmisc/getlong.c, src/chgpasswd.c,
  src/chpasswd.c: New getlong function. Replace chpasswd's and
  chgpasswd's getnumber.
2007-11-23 20:09:57 +00:00
nekral-guest
9adfc136b6 * lib/prototypes.h, configure.in, libmisc/Makefile.am,
libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c,
  libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c:
  Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(),
  xgetgrgid(), and xgetspnam(). They allocate memory for the
  returned structure and are more robust to successive calls. They
  are implemented with the libc's getxxyyy_r() functions if
  available.
* libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c,
  libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c,
  libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c,
  src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c,
  src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c,
  src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c,
  src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c,
  src/groupadd.c, src/chage.c, src/login.c, src/suauth.c,
  src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the
  usage of one of the getpwnam(), getpwuid(), getgrnam(),
  getgrgid(), and getspnam() functions. It was noticed on
  http://bugs.debian.org/341230 that chfn and chsh use a passwd
  structure after calling a pam function, which result in using
  information from the passwd structure requested by pam, not the
  original one. It is much easier to use the new xget... functions
  to avoid these issues. I've checked which call to the original
  get... functions could be left (reducing the scope of the
  structure if possible), and I've left comments to ease future
  reviews (e.g. /* local, no need for xgetpwnam */).
  Note: the getpwent/getgrent calls should probably be checked also.
* src/groupdel.c, src/expiry.c: Fix typos in comments.
* src/groupmod.c: Re-indent.
* libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c,
  lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup
  functions (used by the xget... functions) from the <xx>io.c files
  to the new <xx>mem.c files. This avoid linking some utils against
  the SELinux library.
2007-11-18 23:15:26 +00:00
nekral-guest
ce579ac6d2 Fix typo: EXTRA_DOST -> EXTRA_DIST. 2007-11-18 01:21:43 +00:00
nekral-guest
8451bed8b0 [svn-upgrade] Integrating new upstream version, shadow (4.0.13) 2007-10-07 11:47:01 +00:00
nekral-guest
b48129fcbb [svn-upgrade] Integrating new upstream version, shadow (4.0.11) 2007-10-07 11:46:34 +00:00
nekral-guest
8c50e06102 [svn-upgrade] Integrating new upstream version, shadow (4.0.10) 2007-10-07 11:46:25 +00:00
nekral-guest
8e167d28af [svn-upgrade] Integrating new upstream version, shadow (4.0.8) 2007-10-07 11:46:07 +00:00
nekral-guest
b0e078d9c8 [svn-upgrade] Integrating new upstream version, shadow (4.0.5) 2007-10-07 11:45:40 +00:00