101 lines
3.8 KiB
Diff
101 lines
3.8 KiB
Diff
From 370064ef6f99581b08d473a42bb3417d5dda3e4e Mon Sep 17 00:00:00 2001
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From: Iker Pedrosa <ipedrosa@redhat.com>
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Date: Thu, 17 Feb 2022 10:24:03 +0100
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Subject: [PATCH] pam_usertype: only use SYS_UID_MAX for system users
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* modules/pam_usertype/pam_usertype.c (pam_usertype_is_system): Stop
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using SYS_UID_MIN to check if it is a system account, because all
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accounts below the SYS_UID_MAX are system users.
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* modules/pam_usertype/pam_usertype.8.xml: Remove reference to SYS_UID_MIN
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as it is no longer used to calculate the system accounts.
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* configure.ac: Remove PAM_USERTYPE_SYSUIDMIN.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1949137
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Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
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---
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configure.ac | 5 -----
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modules/pam_usertype/pam_usertype.8.xml | 2 +-
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modules/pam_usertype/pam_usertype.c | 15 ++++++---------
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3 files changed, 7 insertions(+), 15 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 639fc1ad..79113ad1 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -632,11 +632,6 @@ test -n "$opt_uidmin" ||
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opt_uidmin=1000
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AC_DEFINE_UNQUOTED(PAM_USERTYPE_UIDMIN, $opt_uidmin, [Minimum regular user uid.])
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-AC_ARG_WITH([sysuidmin], AS_HELP_STRING([--with-sysuidmin=<number>],[default value for system user min uid (101)]), opt_sysuidmin=$withval)
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-test -n "$opt_sysuidmin" ||
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- opt_sysuidmin=101
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-AC_DEFINE_UNQUOTED(PAM_USERTYPE_SYSUIDMIN, $opt_sysuidmin, [Minimum system user uid.])
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-
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AC_ARG_WITH([kernel-overflow-uid], AS_HELP_STRING([--with-kernel-overflow-uid=<number>],[kernel overflow uid, default (uint16_t)-2=65534]), opt_kerneloverflowuid=$withval)
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test -n "$opt_kerneloverflowuid" ||
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opt_kerneloverflowuid=65534
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diff --git a/modules/pam_usertype/pam_usertype.8.xml b/modules/pam_usertype/pam_usertype.8.xml
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index 7651da6e..d9307ba3 100644
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--- a/modules/pam_usertype/pam_usertype.8.xml
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+++ b/modules/pam_usertype/pam_usertype.8.xml
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@@ -31,7 +31,7 @@
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pam_usertype.so is designed to succeed or fail authentication
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based on type of the account of the authenticated user.
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The type of the account is decided with help of
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- <emphasis>SYS_UID_MIN</emphasis> and <emphasis>SYS_UID_MAX</emphasis>
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+ <emphasis>SYS_UID_MAX</emphasis>
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settings in <emphasis>/etc/login.defs</emphasis>. One use is to select
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whether to load other modules based on this test.
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</para>
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diff --git a/modules/pam_usertype/pam_usertype.c b/modules/pam_usertype/pam_usertype.c
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index d03b73b5..cfd9c8bb 100644
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--- a/modules/pam_usertype/pam_usertype.c
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+++ b/modules/pam_usertype/pam_usertype.c
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@@ -194,7 +194,6 @@ static int
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pam_usertype_is_system(pam_handle_t *pamh, uid_t uid)
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{
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uid_t uid_min;
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- uid_t sys_min;
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uid_t sys_max;
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if (uid == (uid_t)-1) {
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@@ -202,21 +201,19 @@ pam_usertype_is_system(pam_handle_t *pamh, uid_t uid)
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return PAM_USER_UNKNOWN;
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}
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- if (uid <= 99) {
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- /* Reserved. */
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- return PAM_SUCCESS;
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- }
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-
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if (uid == PAM_USERTYPE_OVERFLOW_UID) {
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/* nobody */
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return PAM_SUCCESS;
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}
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uid_min = pam_usertype_get_id(pamh, "UID_MIN", PAM_USERTYPE_UIDMIN);
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- sys_min = pam_usertype_get_id(pamh, "SYS_UID_MIN", PAM_USERTYPE_SYSUIDMIN);
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sys_max = pam_usertype_get_id(pamh, "SYS_UID_MAX", uid_min - 1);
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- return uid >= sys_min && uid <= sys_max ? PAM_SUCCESS : PAM_AUTH_ERR;
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+ if (uid <= sys_max && uid < uid_min) {
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+ return PAM_SUCCESS;
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+ }
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+
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+ return PAM_AUTH_ERR;
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}
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static int
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@@ -253,7 +250,7 @@ pam_usertype_evaluate(struct pam_usertype_opts *opts,
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/**
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* Arguments:
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- * - issystem: uid in <SYS_UID_MIN, SYS_UID_MAX>
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+ * - issystem: uid less than SYS_UID_MAX
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* - isregular: not issystem
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* - use_uid: use user that runs application not that is being authenticate (same as in pam_succeed_if)
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* - audit: log unknown users to syslog
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--
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2.36.1
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