[PATCH 2/2] libvirt patch to write a mcs translation file to /run/setrans directory

[dwalsh@xxxxxxxxxx]

From: Dan Walsh <dwalsh@xxxxxxxxxx>

mcstransd is a translation tool that can translate MCS Labels into human
understandable code.  I have patched it to watch for translation files in the
/run/setrans directory.  This allows us to run commands like ps -eZ and see
system_u:system_r:svirt_t:Fedora18 rather then system_u:system_r:svirt_t:s0:c1,c2.
When used with containers it would make an easy way to list all processes within
a container using ps -eZ | grep Fedora18
---
 src/security/security_selinux.c | 59 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index 5d108b9..cbcd013 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -83,6 +83,57 @@ virSecuritySELinuxRestoreSecurityTPMFileLabelInt(virSecurityManagerPtr mgr,
                                                  virDomainTPMDefPtr tpm);
 
 
+static int
+virSecuritySELinuxAddMCSFile(const char *name,
+                             const char *label)
+{
+    int ret = -1;
+    char *tmp = NULL;
+    context_t con = NULL;
+
+    if (virAsprintf(&tmp, "%s/%s", SELINUX_TRANS_DIR, name) < 0) {
+        virReportOOMError();
+        return -1;
+    }
+    if (! (con = context_new(label))) {
+        virReportSystemError(errno, "%s",
+                             _("unable to allocate security context"));
+        goto cleanup;
+    }
+    if (virFileWriteStr(tmp, context_range_get(con), 0) < 0) {
+        virReportSystemError(errno,
+                             _("unable to create MCS file %s"), tmp);
+        goto cleanup;
+    }
+    ret = 0;
+
+cleanup:
+    VIR_FREE(tmp);
+    context_free(con);
+    return ret;
+}
+
+static int
+virSecuritySELinuxRemoveMCSFile(const char *name)
+{
+    char *tmp=NULL;
+    int ret = -1;
+    if (virAsprintf(&tmp, "%s/%s", SELINUX_TRANS_DIR, name) < 0) {
+        virReportOOMError();
+        return -1;
+    }
+    if (unlink(tmp) < 0 && errno != ENOENT) {
+        virReportSystemError(errno,
+                             _("Unable to remove MCS file %s"), tmp);
+        goto cleanup;
+    }
+    ret = 0;
+
+cleanup:
+    VIR_FREE(tmp);
+    return ret;
+}
+
 /*
  * Returns 0 on success, 1 if already reserved, or -1 on fatal error
  */
@@ -1953,7 +2004,7 @@ virSecuritySELinuxReleaseSecurityLabel(virSecurityManagerPtr mgr,
     }
     VIR_FREE(secdef->imagelabel);
 
-    return 0;
+    return virSecuritySELinuxRemoveMCSFile(def->name);
 }
 
 
@@ -2047,10 +2098,16 @@ virSecuritySELinuxSetSecurityProcessLabel(virSecurityManagerPtr mgr ATTRIBUTE_UN
             return -1;
     }
 
+    if (virSecuritySELinuxAddMCSFile(def->name, secdef->label) < 0) {
+        if (security_getenforce() == 1)
+            return -1;
+    }
+
     if (setexeccon_raw(secdef->label) == -1) {
         virReportSystemError(errno,
                              _("unable to set security context '%s'"),
                              secdef->label);
+        virSecuritySELinuxRemoveMCSFile(def->name);
         if (security_getenforce() == 1)
             return -1;
     }
-- 
1.8.2.1

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