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ima: wrap event related data to the new ima_event_data structure

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All event related data has been wrapped into the new 'ima_event_data'
structure. The main benefit of this patch is that a new information
can be made available to template fields initialization functions
by simply adding a new field to the new structure instead of modifying
the definition of those functions.

Changelog:
 - v2:
   - f_dentry replaced with f_path.dentry (Roberto Sassu)
   - removed declaration of temporary variables in template field functions
     when possible (suggested by Dmitry Kasatkin)

Signed-off-by: Roberto Sassu <rsassu@suse.de>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu
2015-04-11 17:09:50 +02:00
committed by Mimi Zohar
parent 9d03a721a3
commit 23b5741932
5 changed files with 61 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
security/integrity/ima/ima_template_lib.c
View File

@@ -195,9 +195,7 @@ static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
/*
* This function writes the digest of an event (with size limit).
*/
int ima_eventdigest_init(struct integrity_iint_cache *iint, struct file *file,
const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value, int xattr_len,
int ima_eventdigest_init(struct ima_event_data *event_data,
struct ima_field_data *field_data)
{
struct {
@@ -211,25 +209,25 @@ int ima_eventdigest_init(struct integrity_iint_cache *iint, struct file *file,
memset(&hash, 0, sizeof(hash));
if (!iint) /* recording a violation. */
if (!event_data->iint) /* recording a violation. */
goto out;
if (ima_template_hash_algo_allowed(iint->ima_hash->algo)) {
cur_digest = iint->ima_hash->digest;
cur_digestsize = iint->ima_hash->length;
if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
cur_digest = event_data->iint->ima_hash->digest;
cur_digestsize = event_data->iint->ima_hash->length;
goto out;
}
if (!file) /* missing info to re-calculate the digest */
if (!event_data->file) /* missing info to re-calculate the digest */
return -EINVAL;
inode = file_inode(file);
inode = file_inode(event_data->file);
hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
ima_hash_algo : HASH_ALGO_SHA1;
result = ima_calc_file_hash(file, &hash.hdr);
result = ima_calc_file_hash(event_data->file, &hash.hdr);
if (result) {
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
filename, "collect_data",
event_data->filename, "collect_data",
"failed", result, 0);
return result;
}
@@ -243,48 +241,44 @@ out:
/*
* This function writes the digest of an event (without size limit).
*/
int ima_eventdigest_ng_init(struct integrity_iint_cache *iint,
struct file *file, const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value,
int xattr_len, struct ima_field_data *field_data)
int ima_eventdigest_ng_init(struct ima_event_data *event_data,
struct ima_field_data *field_data)
{
u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
u32 cur_digestsize = 0;
/* If iint is NULL, we are recording a violation. */
if (!iint)
if (!event_data->iint)
goto out;
cur_digest = iint->ima_hash->digest;
cur_digestsize = iint->ima_hash->length;
cur_digest = event_data->iint->ima_hash->digest;
cur_digestsize = event_data->iint->ima_hash->length;
hash_algo = iint->ima_hash->algo;
hash_algo = event_data->iint->ima_hash->algo;
out:
return ima_eventdigest_init_common(cur_digest, cur_digestsize,
hash_algo, field_data);
}
static int ima_eventname_init_common(struct integrity_iint_cache *iint,
struct file *file,
const unsigned char *filename,
static int ima_eventname_init_common(struct ima_event_data *event_data,
struct ima_field_data *field_data,
bool size_limit)
{
const char *cur_filename = NULL;
u32 cur_filename_len = 0;
BUG_ON(filename == NULL && file == NULL);
BUG_ON(event_data->filename == NULL && event_data->file == NULL);
if (filename) {
cur_filename = filename;
cur_filename_len = strlen(filename);
if (event_data->filename) {
cur_filename = event_data->filename;
cur_filename_len = strlen(event_data->filename);
if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
goto out;
}
if (file) {
cur_filename = file->f_path.dentry->d_name.name;
if (event_data->file) {
cur_filename = event_data->file->f_path.dentry->d_name.name;
cur_filename_len = strlen(cur_filename);
} else
/*
@@ -300,36 +294,30 @@ out:
/*
* This function writes the name of an event (with size limit).
*/
int ima_eventname_init(struct integrity_iint_cache *iint, struct file *file,
const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value, int xattr_len,
int ima_eventname_init(struct ima_event_data *event_data,
struct ima_field_data *field_data)
{
return ima_eventname_init_common(iint, file, filename,
field_data, true);
return ima_eventname_init_common(event_data, field_data, true);
}
/*
* This function writes the name of an event (without size limit).
*/
int ima_eventname_ng_init(struct integrity_iint_cache *iint, struct file *file,
const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value, int xattr_len,
int ima_eventname_ng_init(struct ima_event_data *event_data,
struct ima_field_data *field_data)
{
return ima_eventname_init_common(iint, file, filename,
field_data, false);
return ima_eventname_init_common(event_data, field_data, false);
}
/*
* ima_eventsig_init - include the file signature as part of the template data
*/
int ima_eventsig_init(struct integrity_iint_cache *iint, struct file *file,
const unsigned char *filename,
struct evm_ima_xattr_data *xattr_value, int xattr_len,
int ima_eventsig_init(struct ima_event_data *event_data,
struct ima_field_data *field_data)
{
enum data_formats fmt = DATA_FMT_HEX;
struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;
int xattr_len = event_data->xattr_len;
int rc = 0;
if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG))