diff options
Diffstat (limited to 'security/integrity')
| -rw-r--r-- | security/integrity/Kconfig | 6 | ||||
| -rw-r--r-- | security/integrity/Makefile | 10 | ||||
| -rw-r--r-- | security/integrity/iint.c | 170 | ||||
| -rw-r--r-- | security/integrity/ima/Kconfig | 1 | ||||
| -rw-r--r-- | security/integrity/ima/Makefile | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima.h | 29 | ||||
| -rw-r--r-- | security/integrity/ima/ima_api.c | 7 | ||||
| -rw-r--r-- | security/integrity/ima/ima_iint.c | 169 | ||||
| -rw-r--r-- | security/integrity/ima/ima_main.c | 12 | ||||
| -rw-r--r-- | security/integrity/integrity.h | 35 |
10 files changed, 242 insertions, 199 deletions
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig new file mode 100644 index 00000000000..27046915568 --- /dev/null +++ b/security/integrity/Kconfig @@ -0,0 +1,6 @@ +# +config INTEGRITY + def_bool y + depends on IMA + +source security/integrity/ima/Kconfig diff --git a/security/integrity/Makefile b/security/integrity/Makefile new file mode 100644 index 00000000000..6eddd61b84e --- /dev/null +++ b/security/integrity/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for caching inode integrity data (iint) +# + +obj-$(CONFIG_INTEGRITY) += integrity.o + +integrity-y := iint.o + +subdir-$(CONFIG_IMA) += ima +obj-$(CONFIG_IMA) += ima/built-in.o diff --git a/security/integrity/iint.c b/security/integrity/iint.c new file mode 100644 index 00000000000..d17de48bd6c --- /dev/null +++ b/security/integrity/iint.c @@ -0,0 +1,170 @@ +/* + * Copyright (C) 2008 IBM Corporation + * + * Authors: + * Mimi Zohar <zohar@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * File: integrity_iint.c + * - implements the integrity hooks: integrity_inode_alloc, + * integrity_inode_free + * - cache integrity information associated with an inode + * using a rbtree tree. + */ +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/rbtree.h> +#include "integrity.h" + +static struct rb_root integrity_iint_tree = RB_ROOT; +static DEFINE_SPINLOCK(integrity_iint_lock); +static struct kmem_cache *iint_cache __read_mostly; + +int iint_initialized; + +/* + * __integrity_iint_find - return the iint associated with an inode + */ +static struct integrity_iint_cache *__integrity_iint_find(struct inode *inode) +{ + struct integrity_iint_cache *iint; + struct rb_node *n = integrity_iint_tree.rb_node; + + assert_spin_locked(&integrity_iint_lock); + + while (n) { + iint = rb_entry(n, struct integrity_iint_cache, rb_node); + + if (inode < iint->inode) + n = n->rb_left; + else if (inode > iint->inode) + n = n->rb_right; + else + break; + } + if (!n) + return NULL; + + return iint; +} + +/* + * integrity_iint_find - return the iint associated with an inode + */ +struct integrity_iint_cache *integrity_iint_find(struct inode *inode) +{ + struct integrity_iint_cache *iint; + + if (!IS_IMA(inode)) + return NULL; + + spin_lock(&integrity_iint_lock); + iint = __integrity_iint_find(inode); + spin_unlock(&integrity_iint_lock); + + return iint; +} + +static void iint_free(struct integrity_iint_cache *iint) +{ + iint->version = 0; + iint->flags = 0UL; + kmem_cache_free(iint_cache, iint); +} + +/** + * integrity_inode_alloc - allocate an iint associated with an inode + * @inode: pointer to the inode + */ +int integrity_inode_alloc(struct inode *inode) +{ + struct rb_node **p; + struct rb_node *new_node, *parent = NULL; + struct integrity_iint_cache *new_iint, *test_iint; + int rc; + + new_iint = kmem_cache_alloc(iint_cache, GFP_NOFS); + if (!new_iint) + return -ENOMEM; + + new_iint->inode = inode; + new_node = &new_iint->rb_node; + + mutex_lock(&inode->i_mutex); /* i_flags */ + spin_lock(&integrity_iint_lock); + + p = &integrity_iint_tree.rb_node; + while (*p) { + parent = *p; + test_iint = rb_entry(parent, struct integrity_iint_cache, + rb_node); + rc = -EEXIST; + if (inode < test_iint->inode) + p = &(*p)->rb_left; + else if (inode > test_iint->inode) + p = &(*p)->rb_right; + else + goto out_err; + } + + inode->i_flags |= S_IMA; + rb_link_node(new_node, parent, p); + rb_insert_color(new_node, &integrity_iint_tree); + + spin_unlock(&integrity_iint_lock); + mutex_unlock(&inode->i_mutex); /* i_flags */ + + return 0; +out_err: + spin_unlock(&integrity_iint_lock); + mutex_unlock(&inode->i_mutex); /* i_flags */ + iint_free(new_iint); + + return rc; +} + +/** + * integrity_inode_free - called on security_inode_free + * @inode: pointer to the inode + * + * Free the integrity information(iint) associated with an inode. + */ +void integrity_inode_free(struct inode *inode) +{ + struct integrity_iint_cache *iint; + + if (!IS_IMA(inode)) + return; + + spin_lock(&integrity_iint_lock); + iint = __integrity_iint_find(inode); + rb_erase(&iint->rb_node, &integrity_iint_tree); + spin_unlock(&integrity_iint_lock); + + iint_free(iint); +} + +static void init_once(void *foo) +{ + struct integrity_iint_cache *iint = foo; + + memset(iint, 0, sizeof *iint); + iint->version = 0; + iint->flags = 0UL; + mutex_init(&iint->mutex); +} + +static int __init integrity_iintcache_init(void) +{ + iint_cache = + kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache), + 0, SLAB_PANIC, init_once); + iint_initialized = 1; + return 0; +} +security_initcall(integrity_iintcache_init); diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index b6ecfd4d8d7..19c053b8230 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -3,6 +3,7 @@ config IMA bool "Integrity Measurement Architecture(IMA)" depends on SECURITY + select INTEGRITY select SECURITYFS select CRYPTO select CRYPTO_HMAC diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile index 787c4cb916c..5690c021de8 100644 --- a/security/integrity/ima/Makefile +++ b/security/integrity/ima/Makefile @@ -6,4 +6,4 @@ obj-$(CONFIG_IMA) += ima.o ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \ - ima_policy.o ima_iint.o ima_audit.o + ima_policy.o ima_audit.o diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 08408bd7146..29d97af5e9a 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -24,11 +24,13 @@ #include <linux/tpm.h> #include <linux/audit.h> +#include "../integrity.h" + enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII }; enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; /* digest size for IMA, fits SHA1 or MD5 */ -#define IMA_DIGEST_SIZE 20 +#define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE #define IMA_EVENT_NAME_LEN_MAX 255 #define IMA_HASH_BITS 9 @@ -96,34 +98,21 @@ static inline unsigned long ima_hash_key(u8 *digest) return hash_long(*digest, IMA_HASH_BITS); } -/* iint cache flags */ -#define IMA_MEASURED 0x01 - -/* integrity data associated with an inode */ -struct ima_iint_cache { - struct rb_node rb_node; /* rooted in ima_iint_tree */ - struct inode *inode; /* back pointer to inode in question */ - u64 version; /* track inode changes */ - unsigned char flags; - u8 digest[IMA_DIGEST_SIZE]; - struct mutex mutex; /* protects: version, flags, digest */ -}; - /* LIM API function definitions */ int ima_must_measure(struct inode *inode, int mask, int function); -int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file); -void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, +int ima_collect_measurement(struct integrity_iint_cache *iint, + struct file *file); +void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename); int ima_store_template(struct ima_template_entry *entry, int violation, struct inode *inode); -void ima_template_show(struct seq_file *m, void *e, - enum ima_show_type show); +void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show); /* rbtree tree calls to lookup, insert, delete * integrity data associated with an inode. */ -struct ima_iint_cache *ima_iint_insert(struct inode *inode); -struct ima_iint_cache *ima_iint_find(struct inode *inode); +struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); +struct integrity_iint_cache *integrity_iint_find(struct inode *inode); /* IMA policy related functions */ enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK }; diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index da36d2c085a..0d50df04ccc 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -126,7 +126,8 @@ int ima_must_measure(struct inode *inode, int mask, int function) * * Return 0 on success, error code otherwise */ -int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file) +int ima_collect_measurement(struct integrity_iint_cache *iint, + struct file *file) { int result = -EEXIST; @@ -156,8 +157,8 @@ int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file) * * Must be called with iint->mutex held. */ -void ima_store_measurement(struct ima_iint_cache *iint, struct file *file, - const unsigned char *filename) +void ima_store_measurement(struct integrity_iint_cache *iint, + struct file *file, const unsigned char *filename) { const char *op = "add_template_measure"; const char *audit_cause = "ENOMEM"; diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c deleted file mode 100644 index 4ae73040ab7..00000000000 --- a/security/integrity/ima/ima_iint.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * Copyright (C) 2008 IBM Corporation - * - * Authors: - * Mimi Zohar <zohar@us.ibm.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation, version 2 of the - * License. - * - * File: ima_iint.c - * - implements the IMA hooks: ima_inode_alloc, ima_inode_free - * - cache integrity information associated with an inode - * using a rbtree tree. - */ -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/spinlock.h> -#include <linux/rbtree.h> -#include "ima.h" - -static struct rb_root ima_iint_tree = RB_ROOT; -static DEFINE_SPINLOCK(ima_iint_lock); -static struct kmem_cache *iint_cache __read_mostly; - -int iint_initialized = 0; - -/* - * __ima_iint_find - return the iint associated with an inode - */ -static struct ima_iint_cache *__ima_iint_find(struct inode *inode) -{ - struct ima_iint_cache *iint; - struct rb_node *n = ima_iint_tree.rb_node; - - assert_spin_locked(&ima_iint_lock); - - while (n) { - iint = rb_entry(n, struct ima_iint_cache, rb_node); - - if (inode < iint->inode) - n = n->rb_left; - else if (inode > iint->inode) - n = n->rb_right; - else - break; - } - if (!n) - return NULL; - - return iint; -} - -/* - * ima_iint_find - return the iint associated with an inode - */ -struct ima_iint_cache *ima_iint_find(struct inode *inode) -{ - struct ima_iint_cache *iint; - - if (!IS_IMA(inode)) - return NULL; - - spin_lock(&ima_iint_lock); - iint = __ima_iint_find(inode); - spin_unlock(&ima_iint_lock); - - return iint; -} - -static void iint_free(struct ima_iint_cache *iint) -{ - iint->version = 0; - iint->flags = 0UL; - kmem_cache_free(iint_cache, iint); -} - -/** - * ima_inode_alloc - allocate an iint associated with an inode - * @inode: pointer to the inode - */ -int ima_inode_alloc(struct inode *inode) -{ - struct rb_node **p; - struct rb_node *new_node, *parent = NULL; - struct ima_iint_cache *new_iint, *test_iint; - int rc; - - new_iint = kmem_cache_alloc(iint_cache, GFP_NOFS); - if (!new_iint) - return -ENOMEM; - - new_iint->inode = inode; - new_node = &new_iint->rb_node; - - mutex_lock(&inode->i_mutex); /* i_flags */ - spin_lock(&ima_iint_lock); - - p = &ima_iint_tree.rb_node; - while (*p) { - parent = *p; - test_iint = rb_entry(parent, struct ima_iint_cache, rb_node); - - rc = -EEXIST; - if (inode < test_iint->inode) - p = &(*p)->rb_left; - else if (inode > test_iint->inode) - p = &(*p)->rb_right; - else - goto out_err; - } - - inode->i_flags |= S_IMA; - rb_link_node(new_node, parent, p); - rb_insert_color(new_node, &ima_iint_tree); - - spin_unlock(&ima_iint_lock); - mutex_unlock(&inode->i_mutex); /* i_flags */ - - return 0; -out_err: - spin_unlock(&ima_iint_lock); - mutex_unlock(&inode->i_mutex); /* i_flags */ - iint_free(new_iint); - - return rc; -} - -/** - * ima_inode_free - called on security_inode_free - * @inode: pointer to the inode - * - * Free the integrity information(iint) associated with an inode. - */ -void ima_inode_free(struct inode *inode) -{ - struct ima_iint_cache *iint; - - if (!IS_IMA(inode)) - return; - - spin_lock(&ima_iint_lock); - iint = __ima_iint_find(inode); - rb_erase(&iint->rb_node, &ima_iint_tree); - spin_unlock(&ima_iint_lock); - - iint_free(iint); -} - -static void init_once(void *foo) -{ - struct ima_iint_cache *iint = foo; - - memset(iint, 0, sizeof *iint); - iint->version = 0; - iint->flags = 0UL; - mutex_init(&iint->mutex); -} - -static int __init ima_iintcache_init(void) -{ - iint_cache = - kmem_cache_create("iint_cache", sizeof(struct ima_iint_cache), 0, - SLAB_PANIC, init_once); - iint_initialized = 1; - return 0; -} -security_initcall(ima_iintcache_init); diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 39d66dc2b8e..25f9fe76289 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -82,7 +82,7 @@ out: "open_writers"); } -static void ima_check_last_writer(struct ima_iint_cache *iint, +static void ima_check_last_writer(struct integrity_iint_cache *iint, struct inode *inode, struct file *file) { @@ -105,12 +105,12 @@ static void ima_check_last_writer(struct ima_iint_cache *iint, void ima_file_free(struct file *file) { struct inode *inode = file->f_dentry->d_inode; - struct ima_iint_cache *iint; + struct integrity_iint_cache *iint; if (!iint_initialized || !S_ISREG(inode->i_mode)) return; - iint = ima_iint_find(inode); + iint = integrity_iint_find(inode); if (!iint) return; @@ -121,7 +121,7 @@ static int process_measurement(struct file *file, const unsigned char *filename, int mask, int function) { struct inode *inode = file->f_dentry->d_inode; - struct ima_iint_cache *iint; + struct integrity_iint_cache *iint; int rc = 0; if (!ima_initialized || !S_ISREG(inode->i_mode)) @@ -131,9 +131,9 @@ static int process_measurement(struct file *file, const unsigned char *filename, if (rc != 0) return rc; retry: - iint = ima_iint_find(inode); + iint = integrity_iint_find(inode); if (!iint) { - rc = ima_inode_alloc(inode); + rc = integrity_inode_alloc(inode); if (!rc || rc == -EEXIST) goto retry; return rc; diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h new file mode 100644 index 00000000000..7351836325a --- /dev/null +++ b/security/integrity/integrity.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2009-2010 IBM Corporation + * + * Authors: + * Mimi Zohar <zohar@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + */ + +#include <linux/types.h> +#include <linux/integrity.h> +#include <crypto/sha.h> + +/* iint cache flags */ +#define IMA_MEASURED 0x01 + +/* integrity data associated with an inode */ +struct integrity_iint_cache { + struct rb_node rb_node; /* rooted in integrity_iint_tree */ + struct inode *inode; /* back pointer to inode in question */ + u64 version; /* track inode changes */ + unsigned char flags; + u8 digest[SHA1_DIGEST_SIZE]; + struct mutex mutex; /* protects: version, flags, digest */ +}; + +/* rbtree tree calls to lookup, insert, delete + * integrity data associated with an inode. + */ +struct integrity_iint_cache *integrity_iint_insert(struct inode *inode); +struct integrity_iint_cache *integrity_iint_find(struct inode *inode); |