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161 lines
3.4 KiB
161 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AppArmor security module |
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* |
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* This file contains AppArmor security identifier (secid) manipulation fns |
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* |
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* Copyright 2009-2017 Canonical Ltd. |
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* |
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* AppArmor allocates a unique secid for every label used. If a label |
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* is replaced it receives the secid of the label it is replacing. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/err.h> |
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#include <linux/gfp.h> |
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#include <linux/idr.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include "include/cred.h" |
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#include "include/lib.h" |
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#include "include/secid.h" |
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#include "include/label.h" |
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#include "include/policy_ns.h" |
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/* |
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* secids - do not pin labels with a refcount. They rely on the label |
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* properly updating/freeing them |
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*/ |
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#define AA_FIRST_SECID 2 |
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static DEFINE_IDR(aa_secids); |
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static DEFINE_SPINLOCK(secid_lock); |
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/* |
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* TODO: allow policy to reserve a secid range? |
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* TODO: add secid pinning |
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* TODO: use secid_update in label replace |
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*/ |
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/** |
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* aa_secid_update - update a secid mapping to a new label |
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* @secid: secid to update |
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* @label: label the secid will now map to |
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*/ |
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void aa_secid_update(u32 secid, struct aa_label *label) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&secid_lock, flags); |
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idr_replace(&aa_secids, label, secid); |
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spin_unlock_irqrestore(&secid_lock, flags); |
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} |
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/** |
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* |
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* see label for inverse aa_label_to_secid |
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*/ |
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struct aa_label *aa_secid_to_label(u32 secid) |
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{ |
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struct aa_label *label; |
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rcu_read_lock(); |
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label = idr_find(&aa_secids, secid); |
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rcu_read_unlock(); |
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return label; |
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} |
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int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
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{ |
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/* TODO: cache secctx and ref count so we don't have to recreate */ |
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struct aa_label *label = aa_secid_to_label(secid); |
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int len; |
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AA_BUG(!seclen); |
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if (!label) |
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return -EINVAL; |
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if (secdata) |
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len = aa_label_asxprint(secdata, root_ns, label, |
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | |
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FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT, |
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GFP_ATOMIC); |
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else |
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len = aa_label_snxprint(NULL, 0, root_ns, label, |
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | |
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FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT); |
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if (len < 0) |
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return -ENOMEM; |
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*seclen = len; |
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return 0; |
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} |
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int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
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{ |
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struct aa_label *label; |
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label = aa_label_strn_parse(&root_ns->unconfined->label, secdata, |
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seclen, GFP_KERNEL, false, false); |
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if (IS_ERR(label)) |
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return PTR_ERR(label); |
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*secid = label->secid; |
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return 0; |
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} |
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void apparmor_release_secctx(char *secdata, u32 seclen) |
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{ |
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kfree(secdata); |
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} |
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/** |
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* aa_alloc_secid - allocate a new secid for a profile |
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* @label: the label to allocate a secid for |
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* @gfp: memory allocation flags |
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* |
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* Returns: 0 with @label->secid initialized |
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* <0 returns error with @label->secid set to AA_SECID_INVALID |
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*/ |
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int aa_alloc_secid(struct aa_label *label, gfp_t gfp) |
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{ |
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unsigned long flags; |
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int ret; |
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idr_preload(gfp); |
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spin_lock_irqsave(&secid_lock, flags); |
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ret = idr_alloc(&aa_secids, label, AA_FIRST_SECID, 0, GFP_ATOMIC); |
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spin_unlock_irqrestore(&secid_lock, flags); |
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idr_preload_end(); |
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if (ret < 0) { |
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label->secid = AA_SECID_INVALID; |
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return ret; |
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} |
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AA_BUG(ret == AA_SECID_INVALID); |
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label->secid = ret; |
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return 0; |
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} |
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/** |
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* aa_free_secid - free a secid |
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* @secid: secid to free |
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*/ |
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void aa_free_secid(u32 secid) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&secid_lock, flags); |
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idr_remove(&aa_secids, secid); |
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spin_unlock_irqrestore(&secid_lock, flags); |
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} |
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void aa_secids_init(void) |
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{ |
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idr_init_base(&aa_secids, AA_FIRST_SECID); |
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}
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