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From 62425bf2a0c72d0e23139d0b285547a7add26251 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
Date: Thu, 15 Nov 2018 19:49:44 +0100
Subject: [PATCH] pam_unix: Add support for crypt_checksalt, if libcrypt
supports it.
libxcrypt v4.3 has added the crypt_checksalt function to whether
the prefix at the begining of a given hash string refers to a
supported hashing method.
Future revisions of this function will add support to check whether
the hashing method, the prefix refers to, was disabled or considered
deprecated by the system's factory presets or system administrator.
Furthermore it will be able to detect whether the parameters, which
are used by the corresponding hashing method, being encoded in the
hash string are not considered to be strong enough anymore.
*modules/pam_unix/passverify.c: Add support for crypt_checksalt.
---
modules/pam_unix/passverify.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/modules/pam_unix/passverify.c b/modules/pam_unix/passverify.c
index 1f433b3a..6132130a 100644
--- a/modules/pam_unix/passverify.c
+++ b/modules/pam_unix/passverify.c
@@ -244,7 +244,13 @@ PAMH_ARG_DECL(int check_shadow_expiry,
D(("account expired"));
return PAM_ACCT_EXPIRED;
}
+#if defined(CRYPT_CHECKSALT_AVAILABLE) && CRYPT_CHECKSALT_AVAILABLE
+ if (spent->sp_lstchg == 0 ||
+ crypt_checksalt(spent->sp_pwdp) == CRYPT_SALT_METHOD_LEGACY ||
+ crypt_checksalt(spent->sp_pwdp) == CRYPT_SALT_TOO_CHEAP) {
+#else
if (spent->sp_lstchg == 0) {
+#endif
D(("need a new password"));
*daysleft = 0;
return PAM_NEW_AUTHTOK_REQD;
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