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kernel/cred.c
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/* Task credentials management - see Documentation/security/credentials.txt |
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* * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ |
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#include <linux/export.h> |
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#include <linux/cred.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> #include <linux/key.h> #include <linux/keyctl.h> #include <linux/init_task.h> #include <linux/security.h> |
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#include <linux/binfmts.h> |
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#include <linux/cn_proc.h> |
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|
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#if 0 |
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#define kdebug(FMT, ...) \ printk("[%-5.5s%5u] " FMT " ", \ current->comm, current->pid, ##__VA_ARGS__) |
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#else |
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#define kdebug(FMT, ...) \ do { \ if (0) \ no_printk("[%-5.5s%5u] " FMT " ", \ current->comm, current->pid, ##__VA_ARGS__); \ } while (0) |
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#endif |
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static struct kmem_cache *cred_jar; |
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|
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/* init to 2 - one for init_task, one to ensure it is never freed */ struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; |
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/* * The initial credentials for the initial task */ struct cred init_cred = { |
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.usage = ATOMIC_INIT(4), |
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#ifdef CONFIG_DEBUG_CREDENTIALS .subscribers = ATOMIC_INIT(2), .magic = CRED_MAGIC, #endif |
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.uid = GLOBAL_ROOT_UID, .gid = GLOBAL_ROOT_GID, .suid = GLOBAL_ROOT_UID, .sgid = GLOBAL_ROOT_GID, .euid = GLOBAL_ROOT_UID, .egid = GLOBAL_ROOT_GID, .fsuid = GLOBAL_ROOT_UID, .fsgid = GLOBAL_ROOT_GID, |
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.securebits = SECUREBITS_DEFAULT, |
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.cap_inheritable = CAP_EMPTY_SET, |
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.cap_permitted = CAP_FULL_SET, |
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.cap_effective = CAP_FULL_SET, .cap_bset = CAP_FULL_SET, |
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.user = INIT_USER, |
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.user_ns = &init_user_ns, |
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.group_info = &init_groups, }; |
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static inline void set_cred_subscribers(struct cred *cred, int n) { #ifdef CONFIG_DEBUG_CREDENTIALS atomic_set(&cred->subscribers, n); #endif } static inline int read_cred_subscribers(const struct cred *cred) { #ifdef CONFIG_DEBUG_CREDENTIALS return atomic_read(&cred->subscribers); #else return 0; #endif } static inline void alter_cred_subscribers(const struct cred *_cred, int n) { #ifdef CONFIG_DEBUG_CREDENTIALS struct cred *cred = (struct cred *) _cred; atomic_add(n, &cred->subscribers); #endif } |
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/* * The RCU callback to actually dispose of a set of credentials */ static void put_cred_rcu(struct rcu_head *rcu) { struct cred *cred = container_of(rcu, struct cred, rcu); |
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kdebug("put_cred_rcu(%p)", cred); #ifdef CONFIG_DEBUG_CREDENTIALS if (cred->magic != CRED_MAGIC_DEAD || atomic_read(&cred->usage) != 0 || read_cred_subscribers(cred) != 0) panic("CRED: put_cred_rcu() sees %p with" " mag %x, put %p, usage %d, subscr %d ", cred, cred->magic, cred->put_addr, atomic_read(&cred->usage), read_cred_subscribers(cred)); #else |
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if (atomic_read(&cred->usage) != 0) panic("CRED: put_cred_rcu() sees %p with usage %d ", cred, atomic_read(&cred->usage)); |
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#endif |
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|
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security_cred_free(cred); |
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key_put(cred->session_keyring); key_put(cred->process_keyring); |
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key_put(cred->thread_keyring); key_put(cred->request_key_auth); |
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if (cred->group_info) put_group_info(cred->group_info); |
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free_uid(cred->user); |
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put_user_ns(cred->user_ns); |
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kmem_cache_free(cred_jar, cred); |
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} /** * __put_cred - Destroy a set of credentials |
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* @cred: The record to release |
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* * Destroy a set of credentials on which no references remain. */ void __put_cred(struct cred *cred) { |
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kdebug("__put_cred(%p{%d,%d})", cred, atomic_read(&cred->usage), read_cred_subscribers(cred)); |
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BUG_ON(atomic_read(&cred->usage) != 0); |
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#ifdef CONFIG_DEBUG_CREDENTIALS BUG_ON(read_cred_subscribers(cred) != 0); cred->magic = CRED_MAGIC_DEAD; cred->put_addr = __builtin_return_address(0); #endif BUG_ON(cred == current->cred); BUG_ON(cred == current->real_cred); |
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|
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call_rcu(&cred->rcu, put_cred_rcu); } EXPORT_SYMBOL(__put_cred); |
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/* * Clean up a task's credentials when it exits */ void exit_creds(struct task_struct *tsk) { struct cred *cred; kdebug("exit_creds(%u,%p,%p,{%d,%d})", tsk->pid, tsk->real_cred, tsk->cred, atomic_read(&tsk->cred->usage), read_cred_subscribers(tsk->cred)); cred = (struct cred *) tsk->real_cred; tsk->real_cred = NULL; validate_creds(cred); alter_cred_subscribers(cred, -1); put_cred(cred); cred = (struct cred *) tsk->cred; tsk->cred = NULL; validate_creds(cred); alter_cred_subscribers(cred, -1); put_cred(cred); |
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} |
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/** * get_task_cred - Get another task's objective credentials * @task: The task to query * * Get the objective credentials of a task, pinning them so that they can't go * away. Accessing a task's credentials directly is not permitted. * * The caller must also make sure task doesn't get deleted, either by holding a * ref on task or by holding tasklist_lock to prevent it from being unlinked. */ const struct cred *get_task_cred(struct task_struct *task) { const struct cred *cred; rcu_read_lock(); do { cred = __task_cred((task)); BUG_ON(!cred); } while (!atomic_inc_not_zero(&((struct cred *)cred)->usage)); rcu_read_unlock(); return cred; } |
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/* * Allocate blank credentials, such that the credentials can be filled in at a * later date without risk of ENOMEM. */ struct cred *cred_alloc_blank(void) { struct cred *new; new = kmem_cache_zalloc(cred_jar, GFP_KERNEL); if (!new) return NULL; |
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atomic_set(&new->usage, 1); |
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#ifdef CONFIG_DEBUG_CREDENTIALS new->magic = CRED_MAGIC; #endif |
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if (security_cred_alloc_blank(new, GFP_KERNEL) < 0) goto error; |
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return new; error: abort_creds(new); return NULL; |
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} |
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/** * prepare_creds - Prepare a new set of credentials for modification * * Prepare a new set of task credentials for modification. A task's creds * shouldn't generally be modified directly, therefore this function is used to * prepare a new copy, which the caller then modifies and then commits by * calling commit_creds(). * |
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* Preparation involves making a copy of the objective creds for modification. * |
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* Returns a pointer to the new creds-to-be if successful, NULL otherwise. * * Call commit_creds() or abort_creds() to clean up. */ struct cred *prepare_creds(void) { struct task_struct *task = current; const struct cred *old; struct cred *new; |
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validate_process_creds(); |
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new = kmem_cache_alloc(cred_jar, GFP_KERNEL); if (!new) return NULL; |
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kdebug("prepare_creds() alloc %p", new); |
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old = task->cred; memcpy(new, old, sizeof(struct cred)); atomic_set(&new->usage, 1); |
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set_cred_subscribers(new, 0); |
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get_group_info(new->group_info); get_uid(new->user); |
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get_user_ns(new->user_ns); |
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#ifdef CONFIG_KEYS |
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key_get(new->session_keyring); key_get(new->process_keyring); |
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key_get(new->thread_keyring); key_get(new->request_key_auth); |
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#endif #ifdef CONFIG_SECURITY new->security = NULL; #endif if (security_prepare_creds(new, old, GFP_KERNEL) < 0) goto error; |
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validate_creds(new); |
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return new; error: abort_creds(new); return NULL; } EXPORT_SYMBOL(prepare_creds); /* |
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* Prepare credentials for current to perform an execve() |
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* - The caller must hold ->cred_guard_mutex |
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*/ struct cred *prepare_exec_creds(void) { |
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struct cred *new; |
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new = prepare_creds(); |
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if (!new) |
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return new; |
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#ifdef CONFIG_KEYS /* newly exec'd tasks don't get a thread keyring */ key_put(new->thread_keyring); new->thread_keyring = NULL; |
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/* inherit the session keyring; new process keyring */ |
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key_put(new->process_keyring); new->process_keyring = NULL; |
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#endif return new; } /* |
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* Copy credentials for the new process created by fork() |
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* * We share if we can, but under some circumstances we have to generate a new * set. |
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* * The new process gets the current process's subjective credentials as its * objective and subjective credentials |
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*/ int copy_creds(struct task_struct *p, unsigned long clone_flags) { |
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struct cred *new; |
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int ret; |
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|
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if ( #ifdef CONFIG_KEYS !p->cred->thread_keyring && #endif clone_flags & CLONE_THREAD ) { |
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p->real_cred = get_cred(p->cred); |
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get_cred(p->cred); |
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alter_cred_subscribers(p->cred, 2); kdebug("share_creds(%p{%d,%d})", p->cred, atomic_read(&p->cred->usage), read_cred_subscribers(p->cred)); |
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atomic_inc(&p->cred->user->processes); return 0; } new = prepare_creds(); if (!new) |
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return -ENOMEM; |
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if (clone_flags & CLONE_NEWUSER) { ret = create_user_ns(new); if (ret < 0) goto error_put; } |
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#ifdef CONFIG_KEYS |
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/* new threads get their own thread keyrings if their parent already * had one */ if (new->thread_keyring) { key_put(new->thread_keyring); new->thread_keyring = NULL; if (clone_flags & CLONE_THREAD) install_thread_keyring_to_cred(new); } |
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/* The process keyring is only shared between the threads in a process; * anything outside of those threads doesn't inherit. */ |
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if (!(clone_flags & CLONE_THREAD)) { |
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key_put(new->process_keyring); new->process_keyring = NULL; |
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} #endif |
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atomic_inc(&new->user->processes); |
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p->cred = p->real_cred = get_cred(new); |
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alter_cred_subscribers(new, 2); validate_creds(new); |
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return 0; |
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error_put: put_cred(new); return ret; |
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} |
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|
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static bool cred_cap_issubset(const struct cred *set, const struct cred *subset) { const struct user_namespace *set_ns = set->user_ns; const struct user_namespace *subset_ns = subset->user_ns; /* If the two credentials are in the same user namespace see if * the capabilities of subset are a subset of set. */ if (set_ns == subset_ns) return cap_issubset(subset->cap_permitted, set->cap_permitted); /* The credentials are in a different user namespaces * therefore one is a subset of the other only if a set is an * ancestor of subset and set->euid is owner of subset or one * of subsets ancestors. */ for (;subset_ns != &init_user_ns; subset_ns = subset_ns->parent) { if ((set_ns == subset_ns->parent) && uid_eq(subset_ns->owner, set->euid)) return true; } return false; } |
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/** * commit_creds - Install new credentials upon the current task * @new: The credentials to be assigned * * Install a new set of credentials to the current task, using RCU to replace |
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* the old set. Both the objective and the subjective credentials pointers are * updated. This function may not be called if the subjective credentials are * in an overridden state. |
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* * This function eats the caller's reference to the new credentials. * * Always returns 0 thus allowing this function to be tail-called at the end * of, say, sys_setgid(). */ int commit_creds(struct cred *new) { struct task_struct *task = current; |
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const struct cred *old = task->real_cred; |
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|
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kdebug("commit_creds(%p{%d,%d})", new, atomic_read(&new->usage), read_cred_subscribers(new)); BUG_ON(task->cred != old); #ifdef CONFIG_DEBUG_CREDENTIALS BUG_ON(read_cred_subscribers(old) < 2); validate_creds(old); validate_creds(new); #endif |
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BUG_ON(atomic_read(&new->usage) < 1); |
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|
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get_cred(new); /* we will require a ref for the subj creds too */ |
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/* dumpability changes */ |
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if (!uid_eq(old->euid, new->euid) || !gid_eq(old->egid, new->egid) || !uid_eq(old->fsuid, new->fsuid) || !gid_eq(old->fsgid, new->fsgid) || |
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!cred_cap_issubset(old, new)) { |
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if (task->mm) set_dumpable(task->mm, suid_dumpable); |
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task->pdeath_signal = 0; smp_wmb(); |
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} |
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/* alter the thread keyring */ |
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if (!uid_eq(new->fsuid, old->fsuid)) |
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key_fsuid_changed(task); |
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if (!gid_eq(new->fsgid, old->fsgid)) |
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key_fsgid_changed(task); /* do it |
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* RLIMIT_NPROC limits on user->processes have already been checked * in set_user(). |
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*/ |
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alter_cred_subscribers(new, 2); |
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if (new->user != old->user) atomic_inc(&new->user->processes); |
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rcu_assign_pointer(task->real_cred, new); |
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rcu_assign_pointer(task->cred, new); if (new->user != old->user) atomic_dec(&old->user->processes); |
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alter_cred_subscribers(old, -2); |
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|
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/* send notifications */ |
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if (!uid_eq(new->uid, old->uid) || !uid_eq(new->euid, old->euid) || !uid_eq(new->suid, old->suid) || !uid_eq(new->fsuid, old->fsuid)) |
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proc_id_connector(task, PROC_EVENT_UID); |
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|
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if (!gid_eq(new->gid, old->gid) || !gid_eq(new->egid, old->egid) || !gid_eq(new->sgid, old->sgid) || !gid_eq(new->fsgid, old->fsgid)) |
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proc_id_connector(task, PROC_EVENT_GID); |
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|
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/* release the old obj and subj refs both */ put_cred(old); |
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put_cred(old); |
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return 0; } |
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EXPORT_SYMBOL(commit_creds); /** * abort_creds - Discard a set of credentials and unlock the current task * @new: The credentials that were going to be applied * * Discard a set of credentials that were under construction and unlock the * current task. */ void abort_creds(struct cred *new) { |
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kdebug("abort_creds(%p{%d,%d})", new, atomic_read(&new->usage), read_cred_subscribers(new)); #ifdef CONFIG_DEBUG_CREDENTIALS BUG_ON(read_cred_subscribers(new) != 0); #endif |
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BUG_ON(atomic_read(&new->usage) < 1); put_cred(new); } EXPORT_SYMBOL(abort_creds); /** |
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* override_creds - Override the current process's subjective credentials |
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* @new: The credentials to be assigned * |
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* Install a set of temporary override subjective credentials on the current * process, returning the old set for later reversion. |
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*/ const struct cred *override_creds(const struct cred *new) { const struct cred *old = current->cred; |
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kdebug("override_creds(%p{%d,%d})", new, atomic_read(&new->usage), read_cred_subscribers(new)); validate_creds(old); validate_creds(new); get_cred(new); alter_cred_subscribers(new, 1); rcu_assign_pointer(current->cred, new); alter_cred_subscribers(old, -1); kdebug("override_creds() = %p{%d,%d}", old, atomic_read(&old->usage), read_cred_subscribers(old)); |
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return old; } EXPORT_SYMBOL(override_creds); /** |
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* revert_creds - Revert a temporary subjective credentials override |
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* @old: The credentials to be restored * |
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* Revert a temporary set of override subjective credentials to an old set, * discarding the override set. |
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*/ void revert_creds(const struct cred *old) { const struct cred *override = current->cred; |
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kdebug("revert_creds(%p{%d,%d})", old, atomic_read(&old->usage), read_cred_subscribers(old)); validate_creds(old); validate_creds(override); alter_cred_subscribers(old, 1); |
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rcu_assign_pointer(current->cred, old); |
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alter_cred_subscribers(override, -1); |
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put_cred(override); } EXPORT_SYMBOL(revert_creds); /* * initialise the credentials stuff */ void __init cred_init(void) { /* allocate a slab in which we can store credentials */ cred_jar = kmem_cache_create("cred_jar", sizeof(struct cred), 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); } |
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/** * prepare_kernel_cred - Prepare a set of credentials for a kernel service * @daemon: A userspace daemon to be used as a reference * * Prepare a set of credentials for a kernel service. This can then be used to * override a task's own credentials so that work can be done on behalf of that * task that requires a different subjective context. * * @daemon is used to provide a base for the security record, but can be NULL. * If @daemon is supplied, then the security data will be derived from that; * otherwise they'll be set to 0 and no groups, full capabilities and no keys. * * The caller may change these controls afterwards if desired. * * Returns the new credentials or NULL if out of memory. * * Does not take, and does not return holding current->cred_replace_mutex. */ struct cred *prepare_kernel_cred(struct task_struct *daemon) { const struct cred *old; struct cred *new; new = kmem_cache_alloc(cred_jar, GFP_KERNEL); if (!new) return NULL; |
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kdebug("prepare_kernel_cred() alloc %p", new); |
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if (daemon) old = get_task_cred(daemon); else old = get_cred(&init_cred); |
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validate_creds(old); |
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*new = *old; |
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atomic_set(&new->usage, 1); set_cred_subscribers(new, 0); |
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get_uid(new->user); |
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get_user_ns(new->user_ns); |
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get_group_info(new->group_info); #ifdef CONFIG_KEYS |
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new->session_keyring = NULL; new->process_keyring = NULL; |
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new->thread_keyring = NULL; |
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new->request_key_auth = NULL; |
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new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; #endif #ifdef CONFIG_SECURITY new->security = NULL; #endif if (security_prepare_creds(new, old, GFP_KERNEL) < 0) goto error; |
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put_cred(old); |
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validate_creds(new); |
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return new; error: put_cred(new); |
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put_cred(old); |
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return NULL; } EXPORT_SYMBOL(prepare_kernel_cred); /** * set_security_override - Set the security ID in a set of credentials * @new: The credentials to alter * @secid: The LSM security ID to set * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. */ int set_security_override(struct cred *new, u32 secid) { return security_kernel_act_as(new, secid); } EXPORT_SYMBOL(set_security_override); /** * set_security_override_from_ctx - Set the security ID in a set of credentials * @new: The credentials to alter * @secctx: The LSM security context to generate the security ID from. * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. The * security ID is specified in string form as a security context to be * interpreted by the LSM. */ int set_security_override_from_ctx(struct cred *new, const char *secctx) { u32 secid; int ret; ret = security_secctx_to_secid(secctx, strlen(secctx), &secid); if (ret < 0) return ret; return set_security_override(new, secid); } EXPORT_SYMBOL(set_security_override_from_ctx); /** * set_create_files_as - Set the LSM file create context in a set of credentials * @new: The credentials to alter * @inode: The inode to take the context from * * Change the LSM file creation context in a set of credentials to be the same * as the object context of the specified inode, so that the new inodes have * the same MAC context as that inode. */ int set_create_files_as(struct cred *new, struct inode *inode) { new->fsuid = inode->i_uid; new->fsgid = inode->i_gid; return security_kernel_create_files_as(new, inode); } EXPORT_SYMBOL(set_create_files_as); |
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#ifdef CONFIG_DEBUG_CREDENTIALS |
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bool creds_are_invalid(const struct cred *cred) { if (cred->magic != CRED_MAGIC) return true; |
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#ifdef CONFIG_SECURITY_SELINUX |
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/* * cred->security == NULL if security_cred_alloc_blank() or * security_prepare_creds() returned an error. */ if (selinux_is_enabled() && cred->security) { |
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if ((unsigned long) cred->security < PAGE_SIZE) return true; if ((*(u32 *)cred->security & 0xffffff00) == (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8)) return true; } #endif return false; } |
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EXPORT_SYMBOL(creds_are_invalid); |
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|
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/* * dump invalid credentials */ static void dump_invalid_creds(const struct cred *cred, const char *label, const struct task_struct *tsk) { printk(KERN_ERR "CRED: %s credentials: %p %s%s%s ", label, cred, cred == &init_cred ? "[init]" : "", cred == tsk->real_cred ? "[real]" : "", cred == tsk->cred ? "[eff]" : ""); printk(KERN_ERR "CRED: ->magic=%x, put_addr=%p ", cred->magic, cred->put_addr); printk(KERN_ERR "CRED: ->usage=%d, subscr=%d ", atomic_read(&cred->usage), read_cred_subscribers(cred)); printk(KERN_ERR "CRED: ->*uid = { %d,%d,%d,%d } ", |
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from_kuid_munged(&init_user_ns, cred->uid), from_kuid_munged(&init_user_ns, cred->euid), from_kuid_munged(&init_user_ns, cred->suid), from_kuid_munged(&init_user_ns, cred->fsuid)); |
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printk(KERN_ERR "CRED: ->*gid = { %d,%d,%d,%d } ", |
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from_kgid_munged(&init_user_ns, cred->gid), from_kgid_munged(&init_user_ns, cred->egid), from_kgid_munged(&init_user_ns, cred->sgid), from_kgid_munged(&init_user_ns, cred->fsgid)); |
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#ifdef CONFIG_SECURITY printk(KERN_ERR "CRED: ->security is %p ", cred->security); if ((unsigned long) cred->security >= PAGE_SIZE && (((unsigned long) cred->security & 0xffffff00) != (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8))) printk(KERN_ERR "CRED: ->security {%x, %x} ", ((u32*)cred->security)[0], ((u32*)cred->security)[1]); #endif } /* * report use of invalid credentials */ void __invalid_creds(const struct cred *cred, const char *file, unsigned line) { printk(KERN_ERR "CRED: Invalid credentials "); printk(KERN_ERR "CRED: At %s:%u ", file, line); dump_invalid_creds(cred, "Specified", current); BUG(); } EXPORT_SYMBOL(__invalid_creds); /* * check the credentials on a process */ void __validate_process_creds(struct task_struct *tsk, const char *file, unsigned line) { if (tsk->cred == tsk->real_cred) { if (unlikely(read_cred_subscribers(tsk->cred) < 2 || creds_are_invalid(tsk->cred))) goto invalid_creds; } else { if (unlikely(read_cred_subscribers(tsk->real_cred) < 1 || read_cred_subscribers(tsk->cred) < 1 || creds_are_invalid(tsk->real_cred) || creds_are_invalid(tsk->cred))) goto invalid_creds; } return; invalid_creds: printk(KERN_ERR "CRED: Invalid process credentials "); printk(KERN_ERR "CRED: At %s:%u ", file, line); dump_invalid_creds(tsk->real_cred, "Real", tsk); if (tsk->cred != tsk->real_cred) dump_invalid_creds(tsk->cred, "Effective", tsk); else printk(KERN_ERR "CRED: Effective creds == Real creds "); BUG(); } EXPORT_SYMBOL(__validate_process_creds); /* * check creds for do_exit() */ void validate_creds_for_do_exit(struct task_struct *tsk) { kdebug("validate_creds_for_do_exit(%p,%p{%d,%d})", tsk->real_cred, tsk->cred, atomic_read(&tsk->cred->usage), read_cred_subscribers(tsk->cred)); __validate_process_creds(tsk, __FILE__, __LINE__); } #endif /* CONFIG_DEBUG_CREDENTIALS */ |