md-cache: Cache security.ima xattrs

From kernel version 3.X or greater, creating of a file
results in removexattr call on security.ima xattr. But
this xattr is not set on the file unless IMA feature
is active. With this patch, removxattr call returns
ENODATA if it is not found in the cache.

Change-Id: I8136096598a983aebc09901945eba1db1b2f93c9
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: http://review.gluster.org/16296
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

1 files changed, 79 insertions, 2 deletions

diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index 36cedc64d70..026b890cd85 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -49,6 +49,8 @@ struct mdc_conf {
 	int  timeout;
 	gf_boolean_t cache_posix_acl;
 	gf_boolean_t cache_selinux;
+        gf_boolean_t cache_capability;
+        gf_boolean_t cache_ima;
 	gf_boolean_t force_readdirp;
         gf_boolean_t cache_swift_metadata;
         gf_boolean_t cache_samba_metadata;
@@ -115,6 +117,11 @@ static struct mdc_key {
 		.check = 1,
 	},
         {
+                .name = "security.ima",
+                .load = 0,
+                .check = 1,
+        },
+        {
                 .name = NULL,
                 .load = 0,
                 .check = 0,
@@ -2226,6 +2233,10 @@ mdc_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
 		 const char *name, dict_t *xdata)
 {
         mdc_local_t  *local = NULL;
+        int           op_errno = ENODATA;
+        int           ret = 0;
+        dict_t       *xattr = NULL;
+        struct mdc_conf *conf = this->private;
 
         local = mdc_local_get (frame);
 
@@ -2233,6 +2244,25 @@ mdc_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
 
 	local->key = gf_strdup (name);
 
+        if (!is_mdc_key_satisfied (name))
+                goto uncached;
+
+        ret = mdc_inode_xatt_get (this, loc->inode, &xattr);
+        if (ret != 0)
+                goto uncached;
+
+        if (!xattr || !dict_get (xattr, (char *)name)) {
+                ret = -1;
+                op_errno = ENODATA;
+        }
+
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_hit);
+        MDC_STACK_UNWIND (removexattr, frame, ret, op_errno, xdata);
+
+        return 0;
+
+uncached:
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_miss);
         STACK_WIND (frame, mdc_removexattr_cbk,
                     FIRST_CHILD(this), FIRST_CHILD(this)->fops->removexattr,
                     loc, name, xdata);
@@ -2272,6 +2302,10 @@ mdc_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
 		  const char *name, dict_t *xdata)
 {
         mdc_local_t  *local = NULL;
+        int           op_errno = ENODATA;
+        int           ret = 0;
+        dict_t       *xattr = NULL;
+        struct mdc_conf *conf = this->private;
 
         local = mdc_local_get (frame);
 
@@ -2279,6 +2313,24 @@ mdc_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
 
 	local->key = gf_strdup (name);
 
+        if (!is_mdc_key_satisfied (name))
+                goto uncached;
+
+        ret = mdc_inode_xatt_get (this, fd->inode, &xattr);
+        if (ret != 0)
+                goto uncached;
+
+        if (!xattr || !dict_get (xattr, (char *)name)) {
+                ret = -1;
+                op_errno = ENODATA;
+        }
+
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_hit);
+        MDC_STACK_UNWIND (fremovexattr, frame, ret, op_errno, xdata);
+        return 0;
+
+uncached:
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_miss);
         STACK_WIND (frame, mdc_fremovexattr_cbk,
                     FIRST_CHILD(this), FIRST_CHILD(this)->fops->fremovexattr,
                     fd, name, xdata);
@@ -2829,7 +2881,16 @@ reconfigure (xlator_t *this, dict_t *options)
 	GF_OPTION_RECONF ("md-cache-timeout", timeout, options, int32, out);
 
 	GF_OPTION_RECONF ("cache-selinux", conf->cache_selinux, options, bool, out);
-	mdc_key_load_set (mdc_keys, "security.", conf->cache_selinux);
+	mdc_key_load_set (mdc_keys, "security.selinux", conf->cache_selinux);
+
+        GF_OPTION_RECONF ("cache-capability-xattrs", conf->cache_capability,
+                          options, bool, out);
+        mdc_key_load_set (mdc_keys, "security.capability",
+                          conf->cache_capability);
+
+        GF_OPTION_RECONF ("cache-ima-xattrs", conf->cache_ima, options, bool,
+                          out);
+        mdc_key_load_set (mdc_keys, "security.ima", conf->cache_ima);
 
 	GF_OPTION_RECONF ("cache-posix-acl", conf->cache_posix_acl, options, bool, out);
 	mdc_key_load_set (mdc_keys, "system.posix_acl_", conf->cache_posix_acl);
@@ -2892,7 +2953,15 @@ init (xlator_t *this)
         GF_OPTION_INIT ("md-cache-timeout", timeout, int32, out);
 
 	GF_OPTION_INIT ("cache-selinux", conf->cache_selinux, bool, out);
-	mdc_key_load_set (mdc_keys, "security.", conf->cache_selinux);
+	mdc_key_load_set (mdc_keys, "security.selinux", conf->cache_selinux);
+
+        GF_OPTION_INIT ("cache-capability-xattrs", conf->cache_capability,
+                        bool, out);
+        mdc_key_load_set (mdc_keys, "security.capability",
+                          conf->cache_capability);
+
+        GF_OPTION_INIT ("cache-ima-xattrs", conf->cache_ima, bool, out);
+        mdc_key_load_set (mdc_keys, "security.ima", conf->cache_ima);
 
 	GF_OPTION_INIT ("cache-posix-acl", conf->cache_posix_acl, bool, out);
 	mdc_key_load_set (mdc_keys, "system.posix_acl_", conf->cache_posix_acl);
@@ -3039,6 +3108,14 @@ struct volume_options options[] = {
 	  .type = GF_OPTION_TYPE_BOOL,
 	  .default_value = "false",
 	},
+        { .key = {"cache-capability-xattrs"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "true",
+        },
+        { .key = {"cache-ima-xattrs"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "true",
+        },
         { .key = {"cache-swift-metadata"},
           .type = GF_OPTION_TYPE_BOOL,
           .default_value = "true",