From 3cec7c9dc5fcc3c18829ec1e6e1bf69afbca1810 Mon Sep 17 00:00:00 2001 From: John Johansen Date: Thu, 22 Jul 2010 02:32:02 -0700 Subject: UBUNTU: SAUCE: AppArmor: Add profile introspection file to interface Add the dynamic profiles file to the interace, to allow load policy introspection. Signed-off-by: John Johansen Acked-by: Kees Cook Signed-off-by: Tim Gardner --- security/apparmor/apparmorfs.c | 227 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 227 insertions(+) diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index 16c15ec6f67..89bdc62ddd2 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -182,6 +182,232 @@ const struct file_operations aa_fs_seq_file_ops = { .release = single_release, }; +/** + * __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 + * NOTE: will not unlock root->lock + */ +static struct aa_namespace *__next_namespace(struct aa_namespace *root, + struct aa_namespace *ns) +{ + struct aa_namespace *parent; + + /* is next namespace a child */ + if (!list_empty(&ns->sub_ns)) { + struct aa_namespace *next; + next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); + read_lock(&next->lock); + return next; + } + + /* check if the next ns is a sibling, parent, gp, .. */ + parent = ns->parent; + while (parent) { + read_unlock(&ns->lock); + list_for_each_entry_continue(ns, &parent->sub_ns, base.list) { + read_lock(&ns->lock); + return ns; + } + if (parent == root) + return NULL; + 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 + */ +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 taversal 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, subling, .. */ + parent = p->parent; + while (parent) { + list_for_each_entry_continue(p, &parent->base.profiles, + base.list) + return p; + p = parent; + parent = parent->parent; + } + + /* is next another profile in the namespace */ + list_for_each_entry_continue(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) + __acquires(root->lock) +{ + 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 */ + read_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 *root = f->private; + (*pos)++; + + return next_profile(root, 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) + __releases(root->lock) +{ + struct aa_profile *profile = p; + struct aa_namespace *root = f->private, *ns; + + if (profile) { + for (ns = profile->ns; ns && ns != root; ns = ns->parent) + read_unlock(&ns->lock); + } + read_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, + COMPLAIN_MODE(profile) ? "complain" : "enforce"); + + 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); +} + +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[] = { @@ -210,6 +436,7 @@ 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), { } }; -- cgit v1.2.3