use lckpwdf() again to disable concurrent edits of databases by other applications
This commit is contained in:
Tomas Mraz
parent
c5ff8b2cd3
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c2e806d82c
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@ -0,0 +1,190 @@
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commit 408b8a548243aebaa6d773beeae8ddf4bb6100f0
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Author: Tomas Mraz <tmraz@fedoraproject.org>
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Date: Thu May 2 14:33:06 2019 +0200
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Use the lckpwdf() again if prefix is not set
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The implementation of prefix option dropped the use of lckpwdf().
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However that is incorrect as other tools manipulating the shadow passwords
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such as PAM use lckpwdf() and do not know anything about the
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shadow's own locking mechanism.
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This reverts the implementation to use lckpwdf() if prefix option
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is not used.
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diff --git a/lib/commonio.c b/lib/commonio.c
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index 26e518f2..94dda779 100644
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--- a/lib/commonio.c
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+++ b/lib/commonio.c
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@@ -364,6 +364,7 @@ static void free_linked_list (struct commonio_db *db)
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int commonio_setname (struct commonio_db *db, const char *name)
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{
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snprintf (db->filename, sizeof (db->filename), "%s", name);
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+ db->setname = true;
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return 1;
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}
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@@ -414,37 +415,39 @@ cleanup_ENOMEM:
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int commonio_lock (struct commonio_db *db)
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{
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-/*#ifdef HAVE_LCKPWDF*/ /* not compatible with prefix option*/
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-#if 0
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- /*
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- * only if the system libc has a real lckpwdf() - the one from
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- * lockpw.c calls us and would cause infinite recursion!
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- */
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+ int i;
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+#ifdef HAVE_LCKPWDF
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/*
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- * Call lckpwdf() on the first lock.
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- * If it succeeds, call *_lock() only once
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- * (no retries, it should always succeed).
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+ * Only if the system libc has a real lckpwdf() - the one from
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+ * lockpw.c calls us and would cause infinite recursion!
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+ * It is also not used with the prefix option.
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*/
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- if (0 == lock_count) {
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- if (lckpwdf () == -1) {
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- if (geteuid () != 0) {
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- (void) fprintf (stderr,
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- "%s: Permission denied.\n",
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- Prog);
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+ if (!db->setname) {
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+ /*
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+ * Call lckpwdf() on the first lock.
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+ * If it succeeds, call *_lock() only once
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+ * (no retries, it should always succeed).
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+ */
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+ if (0 == lock_count) {
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+ if (lckpwdf () == -1) {
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+ if (geteuid () != 0) {
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+ (void) fprintf (stderr,
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+ "%s: Permission denied.\n",
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+ Prog);
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+ }
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+ return 0; /* failure */
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}
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- return 0; /* failure */
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}
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- }
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- if (commonio_lock_nowait (db, true) != 0) {
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- return 1; /* success */
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- }
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+ if (commonio_lock_nowait (db, true) != 0) {
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+ return 1; /* success */
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+ }
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- ulckpwdf ();
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- return 0; /* failure */
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-#else /* !HAVE_LCKPWDF */
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- int i;
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+ ulckpwdf ();
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+ return 0; /* failure */
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+ }
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+#endif /* !HAVE_LCKPWDF */
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/*
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* lckpwdf() not used - do it the old way.
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@@ -471,7 +474,6 @@ int commonio_lock (struct commonio_db *db)
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}
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}
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return 0; /* failure */
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-#endif /* !HAVE_LCKPWDF */
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}
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static void dec_lock_count (void)
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diff --git a/lib/commonio.h b/lib/commonio.h
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index 40e5708f..64e83073 100644
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--- a/lib/commonio.h
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+++ b/lib/commonio.h
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@@ -143,6 +143,7 @@ struct commonio_db {
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bool isopen:1;
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bool locked:1;
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bool readonly:1;
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+ bool setname:1;
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};
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extern int commonio_setname (struct commonio_db *, const char *);
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diff --git a/lib/groupio.c b/lib/groupio.c
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index ae2302b5..bffb06e0 100644
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--- a/lib/groupio.c
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+++ b/lib/groupio.c
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@@ -139,7 +139,8 @@ static /*@owned@*/struct commonio_db group_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int gr_setdbname (const char *filename)
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diff --git a/lib/pwio.c b/lib/pwio.c
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index 7ee85377..127719cb 100644
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--- a/lib/pwio.c
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+++ b/lib/pwio.c
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@@ -114,7 +114,8 @@ static struct commonio_db passwd_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int pw_setdbname (const char *filename)
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diff --git a/lib/sgroupio.c b/lib/sgroupio.c
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index 5423626a..ffbdb263 100644
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--- a/lib/sgroupio.c
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+++ b/lib/sgroupio.c
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@@ -238,7 +238,8 @@ static struct commonio_db gshadow_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int sgr_setdbname (const char *filename)
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diff --git a/lib/shadowio.c b/lib/shadowio.c
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index 5fa3d312..676b1f1a 100644
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--- a/lib/shadowio.c
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+++ b/lib/shadowio.c
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@@ -114,7 +114,8 @@ static struct commonio_db shadow_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int spw_setdbname (const char *filename)
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diff --git a/lib/subordinateio.c b/lib/subordinateio.c
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index a662e67e..dd779c59 100644
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--- a/lib/subordinateio.c
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+++ b/lib/subordinateio.c
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@@ -550,7 +550,8 @@ static struct commonio_db subordinate_uid_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int sub_uid_setdbname (const char *filename)
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@@ -631,7 +632,8 @@ static struct commonio_db subordinate_gid_db = {
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false, /* changed */
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false, /* isopen */
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false, /* locked */
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- false /* readonly */
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+ false, /* readonly */
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+ false /* setname */
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};
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int sub_gid_setdbname (const char *filename)
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@ -1,7 +1,7 @@
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Summary: Utilities for managing accounts and shadow password files
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Name: shadow-utils
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Version: 4.6
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Release: 12%{?dist}
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Release: 13%{?dist}
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Epoch: 2
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URL: http://pkg-shadow.alioth.debian.org/
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Source0: https://github.com/shadow-maint/shadow/releases/download/%{version}/shadow-%{version}.tar.xz
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@ -36,6 +36,7 @@ Patch37: shadow-4.6-sssd-flush.patch
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Patch38: shadow-4.6-sysugid-min-limit.patch
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Patch39: shadow-4.6-chgrp-guard.patch
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Patch40: shadow-4.6-ignore-login-prompt.patch
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Patch41: shadow-4.6-use-lckpwdf.patch
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License: BSD and GPLv2+
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BuildRequires: gcc
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@ -90,6 +91,7 @@ are used for managing group accounts.
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%patch38 -p1 -b .sysugid-min-limit
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%patch39 -p1 -b .chgrp-guard
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%patch40 -p1 -b .login-prompt
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%patch41 -p1 -b .use-lckpwdf
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iconv -f ISO88591 -t utf-8 doc/HOWTO > doc/HOWTO.utf8
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cp -f doc/HOWTO.utf8 doc/HOWTO
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@ -244,6 +246,10 @@ done
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%{_mandir}/man8/vigr.8*
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%changelog
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* Fri May 3 2019 Tomáš Mráz <tmraz@redhat.com> - 2:4.6-13
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- use lckpwdf() again to disable concurrent edits of databases by
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other applications
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* Tue Apr 2 2019 Tomáš Mráz <tmraz@redhat.com> - 2:4.6-12
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- force regeneration of getdate.c otherwise the date parsing fix
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is not applied
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