Xi Ruoyao [Mon, 13 Jun 2022 08:44:14 +0000 (16:44 +0800)]
libmisc: use /dev/urandom as a generic fallback for read_random_bytes()
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.
Replace
AC_HELP_STRING by AS_HELP_STRING,
AC_GNU_SOURCE by AC_USE_SYSTEM_EXTENSIONS,
AC_TRY_COMPILE by AC_COMPILE_IFELSE and
AM_PROG_LIBTOOL by LT_INIT.
See https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Obsolete-Macros.html
Git wants to ensure that you do not read .git owned by other users.
But we fetch+build as 'build' user, and run tests as root user. Those
tests calculate git topdir using git rev-parse --show-toplevel, which
git now fails.
Setting safe.directory, seems wrong. Let's just use bash to figure
out the top dir.
Iker Pedrosa [Tue, 15 Mar 2022 08:29:04 +0000 (09:29 +0100)]
AUTHORS: improve markdown output
The markdown output for the maintainers, authors and contributors list
was wrapped in a single line and it was difficult to read. I've created
an unordered list to get a better output. On top of that I've also added
myself as a maintainer.
Jami Kettunen [Fri, 18 Feb 2022 05:20:20 +0000 (07:20 +0200)]
configure.ac: Default to max group name length of 32
This used to be 16 for historical reasons but these days basically every
distro configures --with-group-name-max-length=32 to make it match the
max Linux username length, make it default.
Signed-off-by: Jami Kettunen <jami.kettunen@protonmail.com>
C++ requires extern "C" linkage specification to call functions from a C
library. Enclose the function definitions in subid.h in an extern "C"
block if compiling in C++ mode to achieve this.
Iker Pedrosa [Tue, 4 Jan 2022 12:06:00 +0000 (13:06 +0100)]
useradd: modify check ID range for system users
useradd warns that a system user ID less than SYS_UID_MIN is outside the
expected range, even though that ID has been specifically selected with
the "-u" option.
In my opinion all the user ID's below SYS_UID_MAX are for the system,
thus I change the condition to take that into account.
Iker Pedrosa [Mon, 10 Jan 2022 14:30:28 +0000 (15:30 +0100)]
nss: get shadow_logfd with log_get_logfd()
If /etc/nsswitch.conf doesn't exist podman crashes because shadow_logfd
is NULL. In order to avoid that load the log file descriptor with the
log_get_logfd() helper function.
Use 'void' instead of 'RETSIGTYPE'. Use 'sighandler_t' too.
C89 and POSIX.1-2001 define signal(2) as returning a pointer to a
function returning 'void'. K&R C signal(2) signature is obsolete.
Use 'void' directly.
Also, instead of writing the function pointer type explicitly, use
POSIX's 'sighandler_t'.
As autoconf documentation says, this macro is obsolescent, as no
current systems have the bug in S_ISDIR, S_ISREG, etc..
The affected systems were Tektronix UTekV, Amdahl UTS, and
Motorola System V/88.
INTERACTIVE Systems Corporation Unix is no longer sold, and Sun
said (long ago) that it would drop support for it on 2006-07-23.
So this macro has been obsolete for more than a decade.
The macro HAVE_RUSEROK is not being used anywhere.
As the Linux manual page says, ruserok(3) is present on the BDSs, Solaris, and many other systems. This function appeared in 4.2BSD. So we probably can rely on its existence.
The macro HAVE_GETTIMEOFDAY is not being used anywhere.
BTW, the function is defined by SVr4, 4.3BSD, and POSIX.1-2001, so
it's likely that it is always available.
POSIX.1-2008 marks it as obsolete, but only because
clock_gettime(2) provides more precission. Since gettimeofday(3)
is in use by many big projects, and it has no obvious dangers,
it's likely that it will continue to exist even if it's outside of
the POSIX standard.
POSIX.1-2001 defines 'struct dirent' in <dirent.h>. It replaces
the old 'struct direct' found in BSDs. All of the systems that I
checked (including FreeBSD, NetBSD, and OpenBSD), now provide
<dirent.h> with 'struct dirent', as mandated by POSIX.
Since autoconf first checks <dirent.h> and only if it's missing it
checks other header files, it's clear that it will always find
<dirent.h>, so let's simplify.
GNU autoconf documentation declares this macro as obsolescent, and
acknowledges that all current systems with directory libraries
have <dirent.h>:
<https://www.gnu.org/software/autoconf/manual/autoconf-2.70/html_node/Particular-Headers.html>
Compilers are allowed to and do optimize memset(3) calls away for
pointers not accessed in the future. Since the memzero wrappers purpose
is exactly to unconditionally override memory (e.g. for stored
passwords) do not implement via regular memset(3), but via either
memset_s(3), explicit_bzero(3) or a hand written implementation using
volatile pointers.
See https://wiki.sei.cmu.edu/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations
run_part() and run_parts() do not modify their directory, name and
action arguments.
Also include the header in the implementation to provide the prototypes.
useradd.c:2495:59: warning: cast discards ‘const’ qualifier from pointer target type [-Wcast-qual]
2495 | if (run_parts ("/etc/shadow-maint/useradd-pre.d", (char*)user_name,
| ^
useradd.c:2495:24: warning: passing argument 1 of ‘run_parts’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
2495 | if (run_parts ("/etc/shadow-maint/useradd-pre.d", (char*)user_name,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from useradd.c:45:
../lib/run_part.h:2:22: note: expected ‘char *’ but argument is of type ‘const char *’
2 | int run_parts (char *directory, char *name, char *action);
| ~~~~~~^~~~~~~~~
useradd.c:2496:25: warning: passing argument 3 of ‘run_parts’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
2496 | "useradd")) {
| ^~~~~~~~~
Function declarations with no argument declare functions taking an
arbitrary number of arguments. Use the special type void to declare
functions taking no argument.
Use isdigit(3) instead of a reimplementation of it
C89 defined isdigit as a function that tests for any decimal-digit
character, defining the decimal digits as 0 1 2 3 4 5 6 7 8 9.
I don't own a copy of C89 to check, but check in C17:
7.4.1.5
5.2.1
More specifically:
> In both the source and execution basic character sets, the value
> of each character after 0 in the above list of decimal digits
> shall be one greater than the value of the previous.
And since in ascii(7), the character after '9' is ':', it's highly
unlikely that any implementation will ever accept any
_decimal digit_ other than 0..9.
POSIX simply defers to the ISO C standard.
This is exactly what we wanted from ISDIGIT(c), so just use it.
Non-standard implementations might have been slower or considered
other characters as digits in the past, but let's assume
implementations available today conform to ISO C89.
Use isdigit(3) directly in comments that referenced it.
Also, in those comments, remove an outdated reference to the fact
that ISDIGIT_LOCALE(c) might evaluate its argument more than once,
which could be true a few commits ago, until
IN_CTYPE_DEFINITION(c) was removed. Previously, the definition
for ISDIGIT_LOCALE(c) was:
Use standard isspace(3), isalpha(3), and isupper(3)
Due to the recent removal of IN_CTYPE_DOMAIN(), the uppercase
macros that wrapped these standard calls are now defined to be
equivalent. Therefore, there's no need for the wrappers, and it
is much more readable to use the standard calls directly.
However, hold on with ISDIGIT*(), since it's not so obvious what
to do with it.
The recent removal of STDC_HEADERS made IN_CTYPE_DOMAIN be defined
to 1 unconditionally. Remove the now unnecessary definition, and
propagate its truthness to expressions where it was used.
We're in 2021. C89 is everywhere; in fact, there are many other
assumptions in the code that wouldn't probably hold on
pre-standard C environments. Let's simplify and assume that C89
is available.
The specific assumptions are that:
- <string.h>, and <stdlib.h> are available
- strchr(3), strrchr(3), and strtok(3) are available
- isalpha(3), isspace(3), isdigit(3), and isupper(3) are available
I think we can safely assume we have all of those.
projects / thirdparty / shadow.git / log
