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From 818cd2018ca66e804ea30066c44572ca128a24a7 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 7 Jun 2022 09:11:56 +0200
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Subject: lslogins: improve prefixes interpretation
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It seems that for example 'passwd --lock' uses two exclamation marks
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in password field. It seems better to assume arbitrary number of '!'
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and '*' prefixes.
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The patch also makes description of the PWD-EMPTY output field more
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explicit.
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Upstream: http://github.com/util-linux/util-linux/commit/c51cba1e838ae7e36a843ec785543492bb8737cd
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2093166
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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login-utils/lslogins.c | 31 +++++++++++++++++++++++++------
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1 file changed, 25 insertions(+), 6 deletions(-)
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diff --git a/login-utils/lslogins.c b/login-utils/lslogins.c
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index 6f804aa35..b81afc6c7 100644
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--- a/login-utils/lslogins.c
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+++ b/login-utils/lslogins.c
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@@ -216,7 +216,7 @@ static const struct lslogins_coldesc coldescs[] =
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{
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[COL_USER] = { "USER", N_("user name"), N_("Username"), 0.1, SCOLS_FL_NOEXTREMES },
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[COL_UID] = { "UID", N_("user ID"), "UID", 1, SCOLS_FL_RIGHT},
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- [COL_PWDEMPTY] = { "PWD-EMPTY", N_("password not required"), N_("Password not required"), 1, SCOLS_FL_RIGHT },
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+ [COL_PWDEMPTY] = { "PWD-EMPTY", N_("password not defined"), N_("Password not required (empty)"), 1, SCOLS_FL_RIGHT },
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[COL_PWDDENY] = { "PWD-DENY", N_("login by password disabled"), N_("Login by password disabled"), 1, SCOLS_FL_RIGHT },
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[COL_PWDLOCK] = { "PWD-LOCK", N_("password defined, but locked"), N_("Password is locked"), 1, SCOLS_FL_RIGHT },
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[COL_NOLOGIN] = { "NOLOGIN", N_("log in disabled by nologin(8) or pam_nologin(8)"), N_("No login"), 1, SCOLS_FL_RIGHT },
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@@ -755,16 +755,24 @@ static struct lslogins_user *get_user_info(struct lslogins_control *ctl, const c
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break;
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case COL_PWDEMPTY:
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if (shadow) {
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- if (!*shadow->sp_pwdp) /* '\0' */
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+ const char *p = shadow->sp_pwdp;
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+
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+ while (p && (*p == '!' || *p == '*'))
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+ p++;
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+
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+ if (!p || !*p)
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user->pwd_empty = STATUS_TRUE;
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} else
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user->pwd_empty = STATUS_UNKNOWN;
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break;
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case COL_PWDDENY:
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if (shadow) {
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- if ((*shadow->sp_pwdp == '!' ||
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- *shadow->sp_pwdp == '*') &&
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- !valid_pwd(shadow->sp_pwdp + 1))
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+ const char *p = shadow->sp_pwdp;
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+
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+ while (p && (*p == '!' || *p == '*'))
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+ p++;
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+
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+ if (p && *p && p != shadow->sp_pwdp && !valid_pwd(p))
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user->pwd_deny = STATUS_TRUE;
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} else
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user->pwd_deny = STATUS_UNKNOWN;
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@@ -772,7 +780,18 @@ static struct lslogins_user *get_user_info(struct lslogins_control *ctl, const c
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case COL_PWDLOCK:
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if (shadow) {
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- if (*shadow->sp_pwdp == '!' && valid_pwd(shadow->sp_pwdp + 1))
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+ const char *p = shadow->sp_pwdp;
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+ int i = 0;
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+
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+ /* 'passwd --lock' uses two exclamation marks,
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+ * shadow(5) describes the lock as "field which
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+ * starts with an exclamation mark". Let's
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+ * support more '!' ...
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+ */
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+ while (p && *p == '!')
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+ p++, i++;
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+
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+ if (i != 0 && (!*p || valid_pwd(p)))
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user->pwd_lock = STATUS_TRUE;
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} else
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user->pwd_lock = STATUS_UNKNOWN;
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--
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2.36.1
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