Resolves: #1025126
- Enhance NSCD's SELinux support to use dynamic permission names (#1025126).
This commit is contained in:
Carlos O'Donell
parent
56999f00cc
commit
91f5f14b93
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@ -0,0 +1,135 @@
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diff --git a/nscd/selinux.c b/nscd/selinux.c
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index 0866c44..ba55b04 100644
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--- a/nscd/selinux.c
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+++ b/nscd/selinux.c
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@@ -44,35 +44,31 @@
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/* Global variable to tell if the kernel has SELinux support. */
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int selinux_enabled;
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-/* Define mappings of access vector permissions to request types. */
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-static const access_vector_t perms[LASTREQ] =
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+/* Define mappings of request type to AVC permission name. */
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+static const char *perms[LASTREQ] =
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{
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- [GETPWBYNAME] = NSCD__GETPWD,
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- [GETPWBYUID] = NSCD__GETPWD,
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- [GETGRBYNAME] = NSCD__GETGRP,
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- [GETGRBYGID] = NSCD__GETGRP,
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- [GETHOSTBYNAME] = NSCD__GETHOST,
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- [GETHOSTBYNAMEv6] = NSCD__GETHOST,
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- [GETHOSTBYADDR] = NSCD__GETHOST,
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- [GETHOSTBYADDRv6] = NSCD__GETHOST,
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- [GETSTAT] = NSCD__GETSTAT,
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- [SHUTDOWN] = NSCD__ADMIN,
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- [INVALIDATE] = NSCD__ADMIN,
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- [GETFDPW] = NSCD__SHMEMPWD,
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- [GETFDGR] = NSCD__SHMEMGRP,
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- [GETFDHST] = NSCD__SHMEMHOST,
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- [GETAI] = NSCD__GETHOST,
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- [INITGROUPS] = NSCD__GETGRP,
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-#ifdef NSCD__GETSERV
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- [GETSERVBYNAME] = NSCD__GETSERV,
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- [GETSERVBYPORT] = NSCD__GETSERV,
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- [GETFDSERV] = NSCD__SHMEMSERV,
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-#endif
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-#ifdef NSCD__GETNETGRP
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- [GETNETGRENT] = NSCD__GETNETGRP,
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- [INNETGR] = NSCD__GETNETGRP,
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- [GETFDNETGR] = NSCD__SHMEMNETGRP,
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-#endif
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+ [GETPWBYNAME] = "getpwd",
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+ [GETPWBYUID] = "getpwd",
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+ [GETGRBYNAME] = "getgrp",
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+ [GETGRBYGID] = "getgrp",
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+ [GETHOSTBYNAME] = "gethost",
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+ [GETHOSTBYNAMEv6] = "gethost",
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+ [GETHOSTBYADDR] = "gethost",
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+ [GETHOSTBYADDRv6] = "gethost",
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+ [SHUTDOWN] = "admin",
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+ [GETSTAT] = "getstat",
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+ [INVALIDATE] = "admin",
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+ [GETFDPW] = "shmempwd",
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+ [GETFDGR] = "shmemgrp",
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+ [GETFDHST] = "shmemhost",
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+ [GETAI] = "gethost",
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+ [INITGROUPS] = "getgrp",
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+ [GETSERVBYNAME] = "getserv",
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+ [GETSERVBYPORT] = "getserv",
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+ [GETFDSERV] = "shmemserv",
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+ [GETNETGRENT] = "getnetgrp",
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+ [INNETGR] = "getnetgrp",
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+ [GETFDNETGR] = "shmemnetgrp",
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};
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/* Store an entry ref to speed AVC decisions. */
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@@ -344,7 +340,18 @@ nscd_avc_init (void)
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/* Check the permission from the caller (via getpeercon) to nscd.
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- Returns 0 if access is allowed, 1 if denied, and -1 on error. */
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+ Returns 0 if access is allowed, 1 if denied, and -1 on error.
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+
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+ Implementation note:
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+ The SELinux policy, enablement, and permission bits are all dynamic
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+ and the caching done by glibc is not entirely correct. This nscd
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+ support should be rewritten to use selinux_check_permission.
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+ A rewrite is risky though and requires some refactoring fist.
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+ Instead we use symbolic mappings instead of compile time
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+ constants (which selinux upstream says are going away), and use
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+ security_deny_unknown to determine what to do if selinux-policy
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+ doesn't have a definition for the the permission or object class
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+ we are looking up. */
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int
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nscd_request_avc_has_perm (int fd, request_type req)
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{
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@@ -354,6 +361,33 @@ nscd_request_avc_has_perm (int fd, request_type req)
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security_id_t ssid = NULL;
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security_id_t tsid = NULL;
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int rc = -1;
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+ security_class_t sc_nscd = 0;
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+ access_vector_t perm = 0;
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+ int avc_deny_unknown = 0;
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+
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+ /* Check if SELinux denys or allows unknown object classes
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+ and permissions. It is 0 if they are allowed, 1 if they
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+ are not allowed and -1 on error. */
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+ if ((avc_deny_unknown = security_deny_unknown ()) == -1)
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+ dbg_log (_("Error querying policy for undefined object classes "
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+ "or permissions."));
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+
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+ /* Get the security class for nscd. If this fails we will likely be
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+ unable to do anything unless avc_deny_unknown is 0. */
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+ if ((sc_nscd = string_to_security_class ("nscd")) == 0
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+ && avc_deny_unknown == 1)
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+ dbg_log (_("Error getting security class for nscd."));
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+
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+ /* Convert permission to AVC bits. */
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+ perm = string_to_av_perm (sc_nscd, perms[req]);
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+ if (perm == 0 && avc_deny_unknown == 1)
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+ dbg_log (_("Error translating permission name "
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+ "\"%s\" to access vector bit."), perms[req]);
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+
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+ /* If the nscd security class was not found or perms were not
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+ found and AVC does not deny unknown values then allow it. */
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+ if ((sc_nscd == 0 || perm == 0) && avc_deny_unknown == 0)
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+ return 0;
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if (getpeercon (fd, &scon) < 0)
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{
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@@ -372,15 +406,7 @@ nscd_request_avc_has_perm (int fd, request_type req)
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goto out;
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}
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-#ifndef NSCD__GETSERV
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- if (perms[req] == 0)
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- {
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- dbg_log (_("compile-time support for database policy missing"));
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- goto out;
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- }
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-#endif
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-
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- rc = avc_has_perm (ssid, tsid, SECCLASS_NSCD, perms[req], &aeref, NULL) < 0;
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+ rc = avc_has_perm (ssid, tsid, sc_nscd, perm, &aeref, NULL) < 0;
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out:
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if (scon)
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@ -1,6 +1,6 @@
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%define glibcsrcdir glibc-2.18-332-gb125d3e
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%define glibcversion 2.18.90
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%define glibcrelease 13%{?dist}
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%define glibcrelease 14%{?dist}
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# Pre-release tarballs are pulled in from git using a command that is
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# effectively:
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#
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@ -211,6 +211,9 @@ Patch2026: %{name}-rh841787.patch
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# Upstream BZ 14185
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Patch2027: %{name}-rh819430.patch
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# Fix nscd to use permission names not constants.
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Patch2028: %{name}-rh1025126.patch
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##############################################################################
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# End of glibc patches.
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##############################################################################
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@ -535,6 +538,7 @@ package or when debugging this package.
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%patch0043 -p1
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%patch0044 -p1
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%patch0046 -p1
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%patch2028 -p1
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##############################################################################
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# %%prep - Additional prep required...
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@ -1620,6 +1624,9 @@ rm -f *.filelist*
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%endif
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%changelog
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* Fri Nov 8 2013 Carlos O'Donell <carlos@redhat.com> - 2.18.90-14
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- Enhance NSCD's SELinux support to use dynamic permission names (#1025126).
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* Mon Oct 28 2013 Siddhesh Poyarekar <siddhesh@redhat.com> - 2.18.90-13
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- Sync with upstream master.
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- Skip over unimplemented timezone format specifier in strptime (#947722).
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