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ima: define new function ima_alloc_init_template() to API 

Instead of allocating and initializing the template entry from multiple
places (eg. boot aggregate, violation, and regular measurements), this
patch defines a new function called ima_alloc_init_template().  The new
function allocates and initializes the measurement entry with the inode
digest and the filename.

In respect to the current behavior, it truncates the file name passed
in the 'filename' argument if the latter's size is greater than 255 bytes
and the passed file descriptor is NULL.

Changelog:
- initialize 'hash' variable for non TPM case - Mimi
- conform to expectation for 'iint' to be defined as a pointer. - Mimi
- add missing 'file' dependency for recalculating file hash. - Mimi

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu 2013-06-07 12:16:28 +02:00 committed by Mimi Zohar
parent 9803d413f4
commit 7bc5f447ce
3 changed files with 76 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
security/integrity/ima/ima.h
View File

@ -107,6 +107,9 @@ void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
const unsigned char *filename);
void ima_audit_measurement(struct integrity_iint_cache *iint,
const unsigned char *filename);
int ima_alloc_init_template(struct integrity_iint_cache *iint,
struct file *file, const unsigned char *filename,
struct ima_template_entry **entry);
int ima_store_template(struct ima_template_entry *entry, int violation,
struct inode *inode, const unsigned char *filename);
void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);

88
security/integrity/ima/ima_api.c
View File

@ -23,6 +23,62 @@
static const char *IMA_TEMPLATE_NAME = "ima";
/*
* ima_alloc_init_template - create and initialize a new template entry
*/
int ima_alloc_init_template(struct integrity_iint_cache *iint,
struct file *file, const unsigned char *filename,
struct ima_template_entry **entry)
{
struct ima_template_entry *e;
int result = 0;
e = kzalloc(sizeof(**entry), GFP_NOFS);
if (!e)
return -ENOMEM;
memset(&(e)->template, 0, sizeof(e->template));
if (!iint) /* IMA measurement violation entry */
goto out;
if (iint->ima_hash->algo != ima_hash_algo) {
struct inode *inode;
struct {
struct ima_digest_data hdr;
char digest[IMA_MAX_DIGEST_SIZE];
} hash;
if (!file) {
result = -EINVAL;
goto out_free;
}
inode = file_inode(file);
hash.hdr.algo = ima_hash_algo;
hash.hdr.length = SHA1_DIGEST_SIZE;
result = ima_calc_file_hash(file, &hash.hdr);
if (result) {
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
filename, "collect_data",
"failed", result, 0);
goto out_free;
} else
memcpy(e->template.digest, hash.hdr.digest,
hash.hdr.length);
} else
memcpy(e->template.digest, iint->ima_hash->digest,
iint->ima_hash->length);
out:
strcpy(e->template.file_name,
(strlen(filename) > IMA_EVENT_NAME_LEN_MAX && file != NULL) ?
file->f_dentry->d_name.name : filename);
*entry = e;
return 0;
out_free:
kfree(e);
return result;
}
/*
* ima_store_template - store ima template measurements
*
@ -90,13 +146,11 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
/* can overflow, only indicator */
atomic_long_inc(&ima_htable.violations);
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
result = ima_alloc_init_template(NULL, file, filename, &entry);
if (result < 0) {
result = -ENOMEM;
goto err_out;
}
memset(&entry->template, 0, sizeof(entry->template));
strncpy(entry->template.file_name, filename, IMA_EVENT_NAME_LEN_MAX);
result = ima_store_template(entry, violation, inode, filename);
if (result < 0)
kfree(entry);
@ -220,34 +274,12 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
if (iint->flags & IMA_MEASURED)
return;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
result = ima_alloc_init_template(iint, file, filename, &entry);
if (result < 0) {
integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode, filename,
op, audit_cause, result, 0);
return;
}
memset(&entry->template, 0, sizeof(entry->template));
if (iint->ima_hash->algo != ima_hash_algo) {
struct {
struct ima_digest_data hdr;
char digest[IMA_MAX_DIGEST_SIZE];
} hash;
hash.hdr.algo = ima_hash_algo;
result = ima_calc_file_hash(file, &hash.hdr);
if (result)
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
filename, "collect_data", "failed",
result, 0);
else
memcpy(entry->template.digest, hash.hdr.digest,
hash.hdr.length);
} else
memcpy(entry->template.digest, iint->ima_hash->digest,
iint->ima_hash->length);
strcpy(entry->template.file_name,
(strlen(filename) > IMA_EVENT_NAME_LEN_MAX) ?
file->f_dentry->d_name.name : filename);
result = ima_store_template(entry, violation, inode, filename);
if (!result || result == -EEXIST)

24
security/integrity/ima/ima_init.c
View File

@ -43,34 +43,36 @@ int ima_used_chip;
static void __init ima_add_boot_aggregate(void)
{
struct ima_template_entry *entry;
struct integrity_iint_cache tmp_iint, *iint = &tmp_iint;
const char *op = "add_boot_aggregate";
const char *audit_cause = "ENOMEM";
int result = -ENOMEM;
int violation = 1;
int violation = 0;
struct {
struct ima_digest_data hdr;
char digest[TPM_DIGEST_SIZE];
} hash;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
goto err_out;
memset(iint, 0, sizeof(*iint));
memset(&hash, 0, sizeof(hash));
iint->ima_hash = &hash.hdr;
iint->ima_hash->algo = HASH_ALGO_SHA1;
iint->ima_hash->length = SHA1_DIGEST_SIZE;
memset(&entry->template, 0, sizeof(entry->template));
strncpy(entry->template.file_name, boot_aggregate_name,
IMA_EVENT_NAME_LEN_MAX);
if (ima_used_chip) {
violation = 0;
hash.hdr.algo = HASH_ALGO_SHA1;
result = ima_calc_boot_aggregate(&hash.hdr);
if (result < 0) {
audit_cause = "hashing_error";
kfree(entry);
goto err_out;
}
memcpy(entry->template.digest, hash.hdr.digest,
hash.hdr.length);
}
result = ima_alloc_init_template(iint, NULL, boot_aggregate_name,
&entry);
if (result < 0)
return;
result = ima_store_template(entry, violation, NULL,
boot_aggregate_name);
if (result < 0)