The setuid, setgid, and sticky bits are not copied during copy_tree.
Also start with very restrictive permissions before setting ownerships.
This prevents situations in which users in a group with less permissions
than others could win a race in opening the file before permissions are
removed again.
Proof of concept:
$ echo $HOME
/home/uwu
$ install -o uwu -g fandom -m 604 /dev/null /home/uwu/owo
$ ls -l /home/uwu/owo
-rw----r-- 1 uwu fandom 0 Sep 4 00:00 /home/uwu/owo
If /tmp is on another filesystem, then "usermod -md /tmp/uwu uwu" leads
to this temporary situation:
$ ls -l /tmp/uwu/owo
-rw----r-- 1 root root 0 Sep 4 00:00 /tmp/uwu/owo
This means that between openat and chownat_if_needed a user of group
fandom could open /tmp/uwu/owo and read the content when it is finally
written into the file.
Fixes regression introduced in faeab50e71.
If a directory contains fifos, then openat blocks until the other side
of the fifo is connected as well.
This means that users can prevent "usermod -m" from completing if their
home directories contain at least one fifo.
The groupadd from shadow does not allow upper case group names, the
same is true for the upstream shadow. But distributions like
Debian/Ubuntu/CentOS has their own way to cope with this problem,
this patch is picked up from Fedora [1] to relax the usernames
restrictions to allow the upper case group names, and the relaxation is
POSIX compliant because POSIX indicate that usernames are composed of
characters from the portable filename character set [A-Za-z0-9._-].
[1] https://src.fedoraproject.org/rpms/shadow-utils/blob/rawhide/f/shadow-4.8-goodname.patch
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
useradd does not create the files if they don't exist, but if they exist
it will reset user data even if the data did not exist before creating
a hole and an explicitly zero'd data point resulting (especially for
high UIDs) in a lot of zeros ending up in containers and tarballs.
As rbalint points out, this was an exported fn. It also is
the only way for a libsubid user to do what it does, so let's
not drop it.
This reverts commit 477c8e6f42.
Use *at() functions to pin the directory operating in to avoid being
redirected by unprivileged users replacing parts of paths by symlinks to
privileged files.
Introduce a path_info struct with the full path and dirfd and name
information for *at() functions, since the full path is needed for link
resolution, SELinux label lookup and ACL attributes.
Use *at() functions to pin the directory operating in to avoid being
redirected by unprivileged users replacing parts of paths by symlinks to
privileged files.
Use *at() functions to pin the directory operating in to avoid being
redirected by unprivileged users replacing parts of paths by symlinks to
privileged files.
Allow the compiler to verify the format string against the supplied
arguments.
chage.c:239:51: warning: format not a string literal, format string not checked [-Wformat-nonliteral]
239 | (void) strftime (buf, sizeof buf, format, tp);
| ^~~~~~
salt.c:102:22: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
102 | static /*@observer@*/const unsigned long SHA_get_salt_rounds (/*@null@*/int *prefered_rounds);
| ^~~~~
salt.c:110:22: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
110 | static /*@observer@*/const unsigned long YESCRYPT_get_salt_cost (/*@null@*/int *prefered_cost);
| ^~~~~
subordinateio.c:160:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
160 | static const bool range_exists(struct commonio_db *db, const char *owner)
| ^~~~~
Compilers are free to ignore the indented hint and modern optimizations
should create good code by themself.
(As such it is for example deprecated in C++17.)
Version 1.19.1 was released in June 2014.
configure.ac:697: warning: AM_PROG_MKDIR_P: this macro is deprecated, and will soon be removed.
configure.ac:697: You should use the Autoconf-provided 'AC_PROG_MKDIR_P' macro instead,
configure.ac:697: and use '$(MKDIR_P)' instead of '$(mkdir_p)'in your Makefile.am files.
./lib/autoconf/general.m4:2434: AC_DIAGNOSE is expanded from...
aclocal.m4:780: AM_PROG_MKDIR_P is expanded from...
m4/po.m4:23: AM_PO_SUBDIRS is expanded from...
m4/gettext.m4:57: AM_GNU_GETTEXT is expanded from...
configure.ac:697: the top level
configure.ac:697: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:697: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from...
lib/m4sugar/m4sh.m4:699: AS_IF is expanded from...
./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from...
./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from...
m4/gettext.m4:365: gt_INTL_MACOSX is expanded from...
m4/gettext.m4:57: AM_GNU_GETTEXT is expanded from...
configure.ac:697: the top level
configure.ac:697: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:697: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from...
lib/m4sugar/m4sh.m4:699: AS_IF is expanded from...
./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from...
./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from...
m4/gettext.m4:57: AM_GNU_GETTEXT is expanded from...
configure.ac:697: the top level
configure.ac:697: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:697: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from...
lib/m4sugar/m4sh.m4:699: AS_IF is expanded from...
./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from...
./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from...
m4/iconv.m4:20: AM_ICONV_LINK is expanded from...
m4/gettext.m4:57: AM_GNU_GETTEXT is expanded from...
configure.ac:697: the top level
See https://www.gnu.org/software/libtool/manual/html_node/LT_005fINIT.html
configure.ac:25: warning: The macro `AM_ENABLE_STATIC' is obsolete.
configure.ac:25: You should run autoupdate.
m4/ltoptions.m4:259: AM_ENABLE_STATIC is expanded from...
configure.ac:25: the top level
configure.ac:26: warning: The macro `AM_ENABLE_SHARED' is obsolete.
configure.ac:26: You should run autoupdate.
m4/ltoptions.m4:205: AM_ENABLE_SHARED is expanded from...
configure.ac:26: the top level
It was hard to extend the option specification string passed to
getopt_long as the third argument.
The origian code had a branch with WITH_SELINUX ifdef condition. If
one wants to add one more option char with another ifdef condition
like ENABLE_SUBIDS to the spec, the one must enumerate the specs for
all combinations of the conditions:
* WITH_SELINUX && ENABLE_SUBIDS
* WITH_SELINUX && !ENABLE_SUBIDS
* !WITH_SELINUX && ENABLE_SUBIDS
* !WITH_SELINUX && !ENABLE_SUBIDS
With this change, you can append an option char to the spec.
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
IDs already populate /etc/subuid and /etc/subgid files so it's necessary
not only to check for the owner name but also for the owner ID of a
given range.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2093311
Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
On systems with Linux kernel < 3.17, getentropy() and getrandom() may
exist but return ENOSYS. Use /dev/urandom as a fallback to avoid a hard
requirement on Linux kernel version.
Fixes#512.
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
