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authorRoberto Sassu <roberto.sassu@polito.it>2013-06-07 12:16:33 +0200
committerMimi Zohar <zohar@linux.vnet.ibm.com>2013-10-25 17:17:06 -0400
commita71dc65d30a472409f05d247f4eab91b14acf2f5 (patch)
tree0d0798a7a40af5db7d44608de1f64ca872bfaf1c
parent4d7aeee73f5304bf195aa2904f8eb1d7b2e8fe52 (diff)
downloadlinux-a71dc65d30a472409f05d247f4eab91b14acf2f5.tar.gz
ima: switch to new template management mechanism
This patch performs the switch to the new template mechanism by modifying the functions ima_alloc_init_template(), ima_measurements_show() and ima_ascii_measurements_show(). The old function ima_template_show() was removed as it is no longer needed. Also, if the template descriptor used to generate a measurement entry is not 'ima', the whole length of field data stored for an entry is provided before the data itself through the binary_runtime_measurement interface. Changelog: - unnecessary to use strncmp() (Mimi Zohar) - create new variable 'field' in ima_alloc_init_template() (Roberto Sassu) - use GFP_NOFS flag in ima_alloc_init_template() (Roberto Sassu) - new variable 'num_fields' in ima_store_template() (Roberto Sassu, proposed by Mimi Zohar) - rename ima_calc_buffer_hash/template_hash() to ima_calc_field_array_hash(), something more generic (Mimi, requested by Dmitry) - sparse error fix - Fengguang Wu - fix lindent warnings - always include the field length in the template data length - include the template field length variable size in the template data length - include both the template field data and field length in the template digest calculation. Simplifies verifying the template digest. (Mimi) Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
-rw-r--r--security/integrity/ima/ima.h19
-rw-r--r--security/integrity/ima/ima_api.c75
-rw-r--r--security/integrity/ima/ima_crypto.c34
-rw-r--r--security/integrity/ima/ima_fs.c54
-rw-r--r--security/integrity/ima/ima_template.c22
5 files changed, 107 insertions, 97 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index e1f081d65dbf..72d013e190b1 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -72,17 +72,11 @@ struct ima_template_desc {
struct ima_template_field **fields;
};
-/* IMA inode template definition */
-struct ima_template_data {
- u8 digest[IMA_DIGEST_SIZE]; /* sha1/md5 measurement hash */
- char file_name[IMA_EVENT_NAME_LEN_MAX + 1]; /* name + \0 */
-};
-
struct ima_template_entry {
u8 digest[TPM_DIGEST_SIZE]; /* sha1 or md5 measurement hash */
- const char *template_name;
- int template_len;
- struct ima_template_data template;
+ struct ima_template_desc *template_desc; /* template descriptor */
+ u32 template_data_len;
+ struct ima_field_data template_data[0]; /* template related data */
};
struct ima_queue_entry {
@@ -102,14 +96,16 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
const char *op, struct inode *inode,
const unsigned char *filename);
int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
-int ima_calc_buffer_hash(const void *data, int len,
- struct ima_digest_data *hash);
+int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields,
+ struct ima_digest_data *hash);
int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
void ima_add_violation(struct file *file, const unsigned char *filename,
const char *op, const char *cause);
int ima_init_crypto(void);
void ima_putc(struct seq_file *m, void *data, int datalen);
void ima_print_digest(struct seq_file *m, u8 *digest, int size);
+struct ima_template_desc *ima_template_desc_current(void);
+int ima_init_template(void);
int ima_init_template(void);
@@ -146,7 +142,6 @@ int ima_alloc_init_template(struct integrity_iint_cache *iint,
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);
const char *ima_d_path(struct path *path, char **pathbuf);
/* rbtree tree calls to lookup, insert, delete
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 29dd43de823a..baa348179527 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -21,8 +21,6 @@
#include <crypto/hash_info.h>
#include "ima.h"
-static const char *IMA_TEMPLATE_NAME = "ima";
-
/*
* ima_alloc_init_template - create and initialize a new template entry
*/
@@ -30,52 +28,32 @@ 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;
+ struct ima_template_desc *template_desc = ima_template_desc_current();
+ int i, result = 0;
- e = kzalloc(sizeof(**entry), GFP_NOFS);
- if (!e)
+ *entry = kzalloc(sizeof(**entry) + template_desc->num_fields *
+ sizeof(struct ima_field_data), GFP_NOFS);
+ if (!*entry)
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;
+ for (i = 0; i < template_desc->num_fields; i++) {
+ struct ima_template_field *field = template_desc->fields[i];
+ u32 len;
- if (!file) {
- result = -EINVAL;
- goto out_free;
- }
+ result = field->field_init(iint, file, filename,
+ &((*entry)->template_data[i]));
+ if (result != 0)
+ goto out;
- 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;
+ len = (*entry)->template_data[i].len;
+ (*entry)->template_data_len += sizeof(len);
+ (*entry)->template_data_len += len;
+ }
+ (*entry)->template_desc = template_desc;
return 0;
-out_free:
- kfree(e);
+out:
+ kfree(*entry);
+ *entry = NULL;
return result;
}
@@ -101,24 +79,23 @@ int ima_store_template(struct ima_template_entry *entry,
{
const char *op = "add_template_measure";
const char *audit_cause = "hashing_error";
+ char *template_name = entry->template_desc->name;
int result;
struct {
struct ima_digest_data hdr;
char digest[TPM_DIGEST_SIZE];
} hash;
- memset(entry->digest, 0, sizeof(entry->digest));
- entry->template_name = IMA_TEMPLATE_NAME;
- entry->template_len = sizeof(entry->template);
-
if (!violation) {
+ int num_fields = entry->template_desc->num_fields;
+
/* this function uses default algo */
hash.hdr.algo = HASH_ALGO_SHA1;
- result = ima_calc_buffer_hash(&entry->template,
- entry->template_len, &hash.hdr);
+ result = ima_calc_field_array_hash(&entry->template_data[0],
+ num_fields, &hash.hdr);
if (result < 0) {
integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode,
- entry->template_name, op,
+ template_name, op,
audit_cause, result, 0);
return result;
}
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 22be23f13b3d..676e0292dfec 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -137,26 +137,46 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash)
}
/*
- * Calculate the hash of a given buffer
+ * Calculate the hash of template data
*/
-static int ima_calc_buffer_hash_tfm(const void *buf, int len,
- struct ima_digest_data *hash,
- struct crypto_shash *tfm)
+static int ima_calc_field_array_hash_tfm(struct ima_field_data *field_data,
+ int num_fields,
+ struct ima_digest_data *hash,
+ struct crypto_shash *tfm)
{
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(tfm)];
} desc;
+ int rc, i;
desc.shash.tfm = tfm;
desc.shash.flags = 0;
hash->length = crypto_shash_digestsize(tfm);
- return crypto_shash_digest(&desc.shash, buf, len, hash->digest);
+ rc = crypto_shash_init(&desc.shash);
+ if (rc != 0)
+ return rc;
+
+ for (i = 0; i < num_fields; i++) {
+ rc = crypto_shash_update(&desc.shash,
+ (const u8 *) &field_data[i].len,
+ sizeof(field_data[i].len));
+ rc = crypto_shash_update(&desc.shash, field_data[i].data,
+ field_data[i].len);
+ if (rc)
+ break;
+ }
+
+ if (!rc)
+ rc = crypto_shash_final(&desc.shash, hash->digest);
+
+ return rc;
}
-int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
+int ima_calc_field_array_hash(struct ima_field_data *field_data, int num_fields,
+ struct ima_digest_data *hash)
{
struct crypto_shash *tfm;
int rc;
@@ -165,7 +185,7 @@ int ima_calc_buffer_hash(const void *buf, int len, struct ima_digest_data *hash)
if (IS_ERR(tfm))
return PTR_ERR(tfm);
- rc = ima_calc_buffer_hash_tfm(buf, len, hash, tfm);
+ rc = ima_calc_field_array_hash_tfm(field_data, num_fields, hash, tfm);
ima_free_tfm(tfm);
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 414862e1904b..d47a7c86a21d 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -110,6 +110,7 @@ void ima_putc(struct seq_file *m, void *data, int datalen)
* char[20]=template digest
* 32bit-le=template name size
* char[n]=template name
+ * [eventdata length]
* eventdata[n]=template specific data
*/
static int ima_measurements_show(struct seq_file *m, void *v)
@@ -119,6 +120,7 @@ static int ima_measurements_show(struct seq_file *m, void *v)
struct ima_template_entry *e;
int namelen;
u32 pcr = CONFIG_IMA_MEASURE_PCR_IDX;
+ int i;
/* get entry */
e = qe->entry;
@@ -136,15 +138,22 @@ static int ima_measurements_show(struct seq_file *m, void *v)
ima_putc(m, e->digest, TPM_DIGEST_SIZE);
/* 3rd: template name size */
- namelen = strlen(e->template_name);
+ namelen = strlen(e->template_desc->name);
ima_putc(m, &namelen, sizeof namelen);
/* 4th: template name */
- ima_putc(m, (void *)e->template_name, namelen);
+ ima_putc(m, e->template_desc->name, namelen);
+
+ /* 5th: template length (except for 'ima' template) */
+ if (strcmp(e->template_desc->name, IMA_TEMPLATE_IMA_NAME) != 0)
+ ima_putc(m, &e->template_data_len,
+ sizeof(e->template_data_len));
- /* 5th: template specific data */
- ima_template_show(m, (struct ima_template_data *)&e->template,
- IMA_SHOW_BINARY);
+ /* 6th: template specific data */
+ for (i = 0; i < e->template_desc->num_fields; i++) {
+ e->template_desc->fields[i]->field_show(m, IMA_SHOW_BINARY,
+ &e->template_data[i]);
+ }
return 0;
}
@@ -175,33 +184,13 @@ void ima_print_digest(struct seq_file *m, u8 *digest, int size)
seq_printf(m, "%02x", *(digest + i));
}
-void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show)
-{
- struct ima_template_data *entry = e;
- int namelen;
-
- switch (show) {
- case IMA_SHOW_ASCII:
- ima_print_digest(m, entry->digest, IMA_DIGEST_SIZE);
- seq_printf(m, " %s\n", entry->file_name);
- break;
- case IMA_SHOW_BINARY:
- ima_putc(m, entry->digest, IMA_DIGEST_SIZE);
-
- namelen = strlen(entry->file_name);
- ima_putc(m, &namelen, sizeof namelen);
- ima_putc(m, entry->file_name, namelen);
- default:
- break;
- }
-}
-
/* print in ascii */
static int ima_ascii_measurements_show(struct seq_file *m, void *v)
{
/* the list never shrinks, so we don't need a lock here */
struct ima_queue_entry *qe = v;
struct ima_template_entry *e;
+ int i;
/* get entry */
e = qe->entry;
@@ -215,11 +204,18 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
ima_print_digest(m, e->digest, TPM_DIGEST_SIZE);
/* 3th: template name */
- seq_printf(m, " %s ", e->template_name);
+ seq_printf(m, " %s", e->template_desc->name);
/* 4th: template specific data */
- ima_template_show(m, (struct ima_template_data *)&e->template,
- IMA_SHOW_ASCII);
+ for (i = 0; i < e->template_desc->num_fields; i++) {
+ seq_puts(m, " ");
+ if (e->template_data[i].len == 0)
+ continue;
+
+ e->template_desc->fields[i]->field_show(m, IMA_SHOW_ASCII,
+ &e->template_data[i]);
+ }
+ seq_puts(m, "\n");
return 0;
}
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index bf38d1af3cfd..1c4cf194592c 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -31,6 +31,20 @@ static struct ima_template_field supported_fields[] = {
.field_show = ima_show_template_string},
};
+static struct ima_template_desc *ima_template;
+
+static struct ima_template_desc *lookup_template_desc(const char *name)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(defined_templates); i++) {
+ if (strcmp(defined_templates[i].name, name) == 0)
+ return defined_templates + i;
+ }
+
+ return NULL;
+}
+
static struct ima_template_field *lookup_template_field(const char *field_id)
{
int i;
@@ -110,6 +124,14 @@ static int init_defined_templates(void)
return result;
}
+struct ima_template_desc *ima_template_desc_current(void)
+{
+ if (!ima_template)
+ ima_template = lookup_template_desc(IMA_TEMPLATE_IMA_NAME);
+
+ return ima_template;
+}
+
int ima_init_template(void)
{
int result;