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libmisc: fix default value in SHA_get_salt_rounds()

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Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
This commit is contained in:
Iker Pedrosa 2021-08-17 09:49:01 +02:00
parent 3a32832856
commit fbc8eba072
2 changed files with 68 additions and 2 deletions
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60
shadow-4.9-libmisc-fix-default-value-in-SHA_get_salt_rounds.patch Normal file
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@ -0,0 +1,60 @@
From 234e8fa7b134d1ebabfdad980a3ae5b63c046c62 Mon Sep 17 00:00:00 2001
From: Mike Gilbert <floppym@gentoo.org>
Date: Sat, 14 Aug 2021 13:24:34 -0400
Subject: [PATCH] libmisc: fix default value in SHA_get_salt_rounds()
If SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS are both unspecified,
use SHA_ROUNDS_DEFAULT.
Previously, the code fell through, calling shadow_random(-1, -1). This
ultimately set rounds = (unsigned long) -1, which ends up being a very
large number! This then got capped to SHA_ROUNDS_MAX later in the
function.
The new behavior matches BCRYPT_get_salt_rounds().
Bug: https://bugs.gentoo.org/808195
Fixes: https://github.com/shadow-maint/shadow/issues/393
---
libmisc/salt.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/libmisc/salt.c b/libmisc/salt.c
index 91d528fd..30eefb9c 100644
--- a/libmisc/salt.c
+++ b/libmisc/salt.c
@@ -223,20 +223,21 @@ static /*@observer@*/const unsigned long SHA_get_salt_rounds (/*@null@*/int *pre
if ((-1 == min_rounds) && (-1 == max_rounds)) {
rounds = SHA_ROUNDS_DEFAULT;
}
+ else {
+ if (-1 == min_rounds) {
+ min_rounds = max_rounds;
+ }
- if (-1 == min_rounds) {
- min_rounds = max_rounds;
- }
+ if (-1 == max_rounds) {
+ max_rounds = min_rounds;
+ }
- if (-1 == max_rounds) {
- max_rounds = min_rounds;
- }
+ if (min_rounds > max_rounds) {
+ max_rounds = min_rounds;
+ }
- if (min_rounds > max_rounds) {
- max_rounds = min_rounds;
+ rounds = (unsigned long) shadow_random (min_rounds, max_rounds);
}
-
- rounds = (unsigned long) shadow_random (min_rounds, max_rounds);
} else if (0 == *prefered_rounds) {
rounds = SHA_ROUNDS_DEFAULT;
} else {
--
2.31.1

10
shadow-utils.spec
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@ -1,7 +1,7 @@
Summary: Utilities for managing accounts and shadow password files
Name: shadow-utils
Version: 4.9
Release: 2%{?dist}
Release: 3%{?dist}
Epoch: 2
URL: https://github.com/shadow-maint/shadow
Source0: https://github.com/shadow-maint/shadow/releases/download/%{version}/shadow-%{version}.tar.xz
@ -48,8 +48,10 @@ Patch13: shadow-4.8-ignore-login-prompt.patch
Patch14: shadow-4.9-newuidmap-libeconf-dependency.patch
# https://github.com/shadow-maint/shadow/commit/e481437ab9ebe9a8bf8fbaabe986d42b2f765991
Patch15: shadow-4.9-usermod-allow-all-group-types.patch
# https://github.com/shadow-maint/shadow/pull/399
# https://github.com/shadow-maint/shadow/commit/9dd720a28578eef5be8171697aae0906e4c53249
Patch16: shadow-4.9-useradd-avoid-generating-empty-subid-range.patch
# https://github.com/shadow-maint/shadow/commit/234e8fa7b134d1ebabfdad980a3ae5b63c046c62
Patch17: shadow-4.9-libmisc-fix-default-value-in-SHA_get_salt_rounds.patch
License: BSD and GPLv2+
BuildRequires: make
@ -114,6 +116,7 @@ Development files for shadow-utils-subid.
%patch14 -p1 -b .newuidmap-libeconf-dependency
%patch15 -p1 -b .usermod-allow-all-group-types
%patch16 -p1 -b .useradd-avoid-generating-empty-subid-range
%patch17 -p1 -b .libmisc-fix-default-value-in-SHA_get_salt_rounds
iconv -f ISO88591 -t utf-8 doc/HOWTO > doc/HOWTO.utf8
cp -f doc/HOWTO.utf8 doc/HOWTO
@ -284,6 +287,9 @@ rm -f $RPM_BUILD_ROOT/%{_libdir}/libsubid.la
%{_libdir}/libsubid.so
%changelog
* Tue Aug 17 2021 Iker Pedrosa <ipedrosa@redhat.com> - 2:4.9-3
- libmisc: fix default value in SHA_get_salt_rounds()
* Mon Aug 9 2021 Iker Pedrosa <ipedrosa@redhat.com> - 2:4.9-2
- useradd: avoid generating an empty subid range (#1990653)