diff options
Diffstat (limited to 'security/apparmor/apparmorfs.c')
| -rw-r--r-- | security/apparmor/apparmorfs.c | 634 |
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 */ |