1 files changed, 624 insertions, 10 deletions

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 16c15ec6f670..7db9954f1af2 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -12,6 +12,7 @@
  * License.
  */
 
+#include <linux/ctype.h>
 #include <linux/security.h>
 #include <linux/vmalloc.h>
 #include <linux/module.h>
@@ -19,15 +20,56 @@
 #include <linux/uaccess.h>
 #include <linux/namei.h>
 #include <linux/capability.h>
+#include <linux/rcupdate.h>
 
 #include "include/apparmor.h"
 #include "include/apparmorfs.h"
 #include "include/audit.h"
 #include "include/context.h"
+#include "include/crypto.h"
 #include "include/policy.h"
 #include "include/resource.h"
 
 /**
+ * aa_mangle_name - mangle a profile name to std profile layout form
+ * @name: profile name to mangle  (NOT NULL)
+ * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
+ *
+ * Returns: length of mangled name
+ */
+static int mangle_name(char *name, char *target)
+{
+	char *t = target;
+
+	while (*name == '/' || *name == '.')
+		name++;
+
+	if (target) {
+		for (; *name; name++) {
+			if (*name == '/')
+				*(t)++ = '.';
+			else if (isspace(*name))
+				*(t)++ = '_';
+			else if (isalnum(*name) || strchr("._-", *name))
+				*(t)++ = *name;
+		}
+
+		*t = 0;
+	} else {
+		int len = 0;
+		for (; *name; name++) {
+			if (isalnum(*name) || isspace(*name) ||
+			    strchr("/._-", *name))
+				len++;
+		}
+
+		return len;
+	}
+
+	return t - target;
+}
+
+/**
  * aa_simple_write_to_buffer - common routine for getting policy from user
  * @op: operation doing the user buffer copy
  * @userbuf: user buffer to copy data from  (NOT NULL)
@@ -182,8 +224,565 @@ const struct file_operations aa_fs_seq_file_ops = {
 	.release	= single_release,
 };
 
-/** Base file system setup **/
+static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
+				  int (*show)(struct seq_file *, void *))
+{
+	struct aa_replacedby *r = aa_get_replacedby(inode->i_private);
+	int error = single_open(file, show, r);
+
+	if (error) {
+		file->private_data = NULL;
+		aa_put_replacedby(r);
+	}
+
+	return error;
+}
+
+static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = (struct seq_file *) file->private_data;
+	if (seq)
+		aa_put_replacedby(seq->private);
+	return single_release(inode, file);
+}
+
+static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
+}
+
+static const struct file_operations aa_fs_profname_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profname_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
+}
+
+static const struct file_operations aa_fs_profmode_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profmode_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	if (profile->attach)
+		seq_printf(seq, "%s\n", profile->attach);
+	else if (profile->xmatch)
+		seq_puts(seq, "<unknown>\n");
+	else
+		seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_profile(profile);
+
+	return 0;
+}
+
+static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
+{
+	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
+}
+
+static const struct file_operations aa_fs_profattach_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_profattach_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
+{
+	struct aa_replacedby *r = seq->private;
+	struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+	unsigned int i, size = aa_hash_size();
+
+	if (profile->hash) {
+		for (i = 0; i < size; i++)
+			seq_printf(seq, "%.2x", profile->hash[i]);
+		seq_puts(seq, "\n");
+	}
+
+	return 0;
+}
+
+static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aa_fs_seq_hash_show, inode->i_private);
+}
+
+static const struct file_operations aa_fs_seq_hash_fops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_fs_seq_hash_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/** fns to setup dynamic per profile/namespace files **/
+void __aa_fs_profile_rmdir(struct aa_profile *profile)
+{
+	struct aa_profile *child;
+	int i;
+
+	if (!profile)
+		return;
+
+	list_for_each_entry(child, &profile->base.profiles, base.list)
+		__aa_fs_profile_rmdir(child);
+
+	for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
+		struct aa_replacedby *r;
+		if (!profile->dents[i])
+			continue;
+
+		r = profile->dents[i]->d_inode->i_private;
+		securityfs_remove(profile->dents[i]);
+		aa_put_replacedby(r);
+		profile->dents[i] = NULL;
+	}
+}
+
+void __aa_fs_profile_migrate_dents(struct aa_profile *old,
+				   struct aa_profile *new)
+{
+	int i;
+
+	for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
+		new->dents[i] = old->dents[i];
+		old->dents[i] = NULL;
+	}
+}
+
+static struct dentry *create_profile_file(struct dentry *dir, const char *name,
+					  struct aa_profile *profile,
+					  const struct file_operations *fops)
+{
+	struct aa_replacedby *r = aa_get_replacedby(profile->replacedby);
+	struct dentry *dent;
+
+	dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops);
+	if (IS_ERR(dent))
+		aa_put_replacedby(r);
+
+	return dent;
+}
+
+/* requires lock be held */
+int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
+{
+	struct aa_profile *child;
+	struct dentry *dent = NULL, *dir;
+	int error;
+
+	if (!parent) {
+		struct aa_profile *p;
+		p = aa_deref_parent(profile);
+		dent = prof_dir(p);
+		/* adding to parent that previously didn't have children */
+		dent = securityfs_create_dir("profiles", dent);
+		if (IS_ERR(dent))
+			goto fail;
+		prof_child_dir(p) = parent = dent;
+	}
+
+	if (!profile->dirname) {
+		int len, id_len;
+		len = mangle_name(profile->base.name, NULL);
+		id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
+
+		profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
+		if (!profile->dirname)
+			goto fail;
+
+		mangle_name(profile->base.name, profile->dirname);
+		sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
+	}
+
+	dent = securityfs_create_dir(profile->dirname, parent);
+	if (IS_ERR(dent))
+		goto fail;
+	prof_dir(profile) = dir = dent;
+
+	dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_NAME] = dent;
+
+	dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_MODE] = dent;
+
+	dent = create_profile_file(dir, "attach", profile,
+				   &aa_fs_profattach_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_ATTACH] = dent;
+
+	if (profile->hash) {
+		dent = create_profile_file(dir, "sha1", profile,
+					   &aa_fs_seq_hash_fops);
+		if (IS_ERR(dent))
+			goto fail;
+		profile->dents[AAFS_PROF_HASH] = dent;
+	}
+
+	list_for_each_entry(child, &profile->base.profiles, base.list) {
+		error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aa_fs_profile_rmdir(profile);
+
+	return error;
+}
+
+void __aa_fs_namespace_rmdir(struct aa_namespace *ns)
+{
+	struct aa_namespace *sub;
+	struct aa_profile *child;
+	int i;
+
+	if (!ns)
+		return;
+
+	list_for_each_entry(child, &ns->base.profiles, base.list)
+		__aa_fs_profile_rmdir(child);
+
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock(&sub->lock);
+		__aa_fs_namespace_rmdir(sub);
+		mutex_unlock(&sub->lock);
+	}
 
+	for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
+		securityfs_remove(ns->dents[i]);
+		ns->dents[i] = NULL;
+	}
+}
+
+int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
+			    const char *name)
+{
+	struct aa_namespace *sub;
+	struct aa_profile *child;
+	struct dentry *dent, *dir;
+	int error;
+
+	if (!name)
+		name = ns->base.name;
+
+	dent = securityfs_create_dir(name, parent);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_dir(ns) = dir = dent;
+
+	dent = securityfs_create_dir("profiles", dir);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_subprofs_dir(ns) = dent;
+
+	dent = securityfs_create_dir("namespaces", dir);
+	if (IS_ERR(dent))
+		goto fail;
+	ns_subns_dir(ns) = dent;
+
+	list_for_each_entry(child, &ns->base.profiles, base.list) {
+		error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
+		if (error)
+			goto fail2;
+	}
+
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock(&sub->lock);
+		error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL);
+		mutex_unlock(&sub->lock);
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aa_fs_namespace_rmdir(ns);
+
+	return error;
+}
+
+
+#define list_entry_next(pos, member) \
+	list_entry(pos->member.next, typeof(*pos), member)
+#define list_entry_is_head(pos, head, member) (&pos->member == (head))
+
+/**
+ * __next_namespace - find the next namespace to list
+ * @root: root namespace to stop search at (NOT NULL)
+ * @ns: current ns position (NOT NULL)
+ *
+ * Find the next namespace from @ns under @root and handle all locking needed
+ * while switching current namespace.
+ *
+ * Returns: next namespace or NULL if at last namespace under @root
+ * Requires: ns->parent->lock to be held
+ * NOTE: will not unlock root->lock
+ */
+static struct aa_namespace *__next_namespace(struct aa_namespace *root,
+					     struct aa_namespace *ns)
+{
+	struct aa_namespace *parent, *next;
+
+	/* is next namespace a child */
+	if (!list_empty(&ns->sub_ns)) {
+		next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
+		mutex_lock(&next->lock);
+		return next;
+	}
+
+	/* check if the next ns is a sibling, parent, gp, .. */
+	parent = ns->parent;
+	while (ns != root) {
+		mutex_unlock(&ns->lock);
+		next = list_entry_next(ns, base.list);
+		if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
+			mutex_lock(&next->lock);
+			return next;
+		}
+		ns = parent;
+		parent = parent->parent;
+	}
+
+	return NULL;
+}
+
+/**
+ * __first_profile - find the first profile in a namespace
+ * @root: namespace that is root of profiles being displayed (NOT NULL)
+ * @ns: namespace to start in   (NOT NULL)
+ *
+ * Returns: unrefcounted profile or NULL if no profile
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__first_profile(struct aa_namespace *root,
+					  struct aa_namespace *ns)
+{
+	for (; ns; ns = __next_namespace(root, ns)) {
+		if (!list_empty(&ns->base.profiles))
+			return list_first_entry(&ns->base.profiles,
+						struct aa_profile, base.list);
+	}
+	return NULL;
+}
+
+/**
+ * __next_profile - step to the next profile in a profile tree
+ * @profile: current profile in tree (NOT NULL)
+ *
+ * Perform a depth first traversal on the profile tree in a namespace
+ *
+ * Returns: next profile or NULL if done
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__next_profile(struct aa_profile *p)
+{
+	struct aa_profile *parent;
+	struct aa_namespace *ns = p->ns;
+
+	/* is next profile a child */
+	if (!list_empty(&p->base.profiles))
+		return list_first_entry(&p->base.profiles, typeof(*p),
+					base.list);
+
+	/* is next profile a sibling, parent sibling, gp, sibling, .. */
+	parent = rcu_dereference_protected(p->parent,
+					   mutex_is_locked(&p->ns->lock));
+	while (parent) {
+		p = list_entry_next(p, base.list);
+		if (!list_entry_is_head(p, &parent->base.profiles, base.list))
+			return p;
+		p = parent;
+		parent = rcu_dereference_protected(parent->parent,
+					    mutex_is_locked(&parent->ns->lock));
+	}
+
+	/* is next another profile in the namespace */
+	p = list_entry_next(p, base.list);
+	if (!list_entry_is_head(p, &ns->base.profiles, base.list))
+		return p;
+
+	return NULL;
+}
+
+/**
+ * next_profile - step to the next profile in where ever it may be
+ * @root: root namespace  (NOT NULL)
+ * @profile: current profile  (NOT NULL)
+ *
+ * Returns: next profile or NULL if there isn't one
+ */
+static struct aa_profile *next_profile(struct aa_namespace *root,
+				       struct aa_profile *profile)
+{
+	struct aa_profile *next = __next_profile(profile);
+	if (next)
+		return next;
+
+	/* finished all profiles in namespace move to next namespace */
+	return __first_profile(root, __next_namespace(root, profile->ns));
+}
+
+/**
+ * p_start - start a depth first traversal of profile tree
+ * @f: seq_file to fill
+ * @pos: current position
+ *
+ * Returns: first profile under current namespace or NULL if none found
+ *
+ * acquires first ns->lock
+ */
+static void *p_start(struct seq_file *f, loff_t *pos)
+{
+	struct aa_profile *profile = NULL;
+	struct aa_namespace *root = aa_current_profile()->ns;
+	loff_t l = *pos;
+	f->private = aa_get_namespace(root);
+
+
+	/* find the first profile */
+	mutex_lock(&root->lock);
+	profile = __first_profile(root, root);
+
+	/* skip to position */
+	for (; profile && l > 0; l--)
+		profile = next_profile(root, profile);
+
+	return profile;
+}
+
+/**
+ * p_next - read the next profile entry
+ * @f: seq_file to fill
+ * @p: profile previously returned
+ * @pos: current position
+ *
+ * Returns: next profile after @p or NULL if none
+ *
+ * may acquire/release locks in namespace tree as necessary
+ */
+static void *p_next(struct seq_file *f, void *p, loff_t *pos)
+{
+	struct aa_profile *profile = p;
+	struct aa_namespace *ns = f->private;
+	(*pos)++;
+
+	return next_profile(ns, profile);
+}
+
+/**
+ * p_stop - stop depth first traversal
+ * @f: seq_file we are filling
+ * @p: the last profile writen
+ *
+ * Release all locking done by p_start/p_next on namespace tree
+ */
+static void p_stop(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = p;
+	struct aa_namespace *root = f->private, *ns;
+
+	if (profile) {
+		for (ns = profile->ns; ns && ns != root; ns = ns->parent)
+			mutex_unlock(&ns->lock);
+	}
+	mutex_unlock(&root->lock);
+	aa_put_namespace(root);
+}
+
+/**
+ * seq_show_profile - show a profile entry
+ * @f: seq_file to file
+ * @p: current position (profile)    (NOT NULL)
+ *
+ * Returns: error on failure
+ */
+static int seq_show_profile(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = (struct aa_profile *)p;
+	struct aa_namespace *root = f->private;
+
+	if (profile->ns != root)
+		seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
+	seq_printf(f, "%s (%s)\n", profile->base.hname,
+		   aa_profile_mode_names[profile->mode]);
+
+	return 0;
+}
+
+static const struct seq_operations aa_fs_profiles_op = {
+	.start = p_start,
+	.next = p_next,
+	.stop = p_stop,
+	.show = seq_show_profile,
+};
+
+static int profiles_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &aa_fs_profiles_op);
+}
+
+static int profiles_release(struct inode *inode, struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+static const struct file_operations aa_fs_profiles_fops = {
+	.open = profiles_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = profiles_release,
+};
+
+
+/** Base file system setup **/
 static struct aa_fs_entry aa_fs_entry_file[] = {
 	AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
 				  "link lock"),
@@ -198,11 +797,18 @@ static struct aa_fs_entry aa_fs_entry_domain[] = {
 	{ }
 };
 
+static struct aa_fs_entry aa_fs_entry_policy[] = {
+	AA_FS_FILE_BOOLEAN("set_load",          1),
+	{}
+};
+
 static struct aa_fs_entry aa_fs_entry_features[] = {
+	AA_FS_DIR("policy",			aa_fs_entry_policy),
 	AA_FS_DIR("domain",			aa_fs_entry_domain),
 	AA_FS_DIR("file",			aa_fs_entry_file),
 	AA_FS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
 	AA_FS_DIR("rlimit",			aa_fs_entry_rlimit),
+	AA_FS_DIR("caps",			aa_fs_entry_caps),
 	{ }
 };
 
@@ -210,6 +816,7 @@ static struct aa_fs_entry aa_fs_entry_apparmor[] = {
 	AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
 	AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
 	AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
+	AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
 	AA_FS_DIR("features", aa_fs_entry_features),
 	{ }
 };
@@ -240,6 +847,7 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
 	return error;
 }
 
+static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
 /**
  * aafs_create_dir - recursively create a directory entry in the securityfs
  * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
@@ -250,17 +858,16 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
 				  struct dentry *parent)
 {
-	int error;
 	struct aa_fs_entry *fs_file;
+	struct dentry *dir;
+	int error;
 
-	fs_dir->dentry = securityfs_create_dir(fs_dir->name, parent);
-	if (IS_ERR(fs_dir->dentry)) {
-		error = PTR_ERR(fs_dir->dentry);
-		fs_dir->dentry = NULL;
-		goto failed;
-	}
+	dir = securityfs_create_dir(fs_dir->name, parent);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	fs_dir->dentry = dir;
 
-	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
 		if (fs_file->v_type == AA_FS_TYPE_DIR)
 			error = aafs_create_dir(fs_file, fs_dir->dentry);
 		else
@@ -272,6 +879,8 @@ static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
 	return 0;
 
 failed:
+	aafs_remove_dir(fs_dir);
+
 	return error;
 }
 
@@ -296,7 +905,7 @@ static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
 {
 	struct aa_fs_entry *fs_file;
 
-	for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
 		if (fs_file->v_type == AA_FS_TYPE_DIR)
 			aafs_remove_dir(fs_file);
 		else
@@ -340,6 +949,11 @@ static int __init aa_create_aafs(void)
 	if (error)
 		goto error;
 
+	error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry,
+					"policy");
+	if (error)
+		goto error;
+
 	/* TODO: add support for apparmorfs_null and apparmorfs_mnt */
 
 	/* Report that AppArmor fs is enabled */