From 7bc5f447ce9d01e19394b5399bf1a4fcebf0f8dd Mon Sep 17 00:00:00 2001 From: Roberto Sassu Date: Fri, 7 Jun 2013 12:16:28 +0200 Subject: [PATCH] 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 Signed-off-by: Mimi Zohar --- security/integrity/ima/ima.h | 3 ++ security/integrity/ima/ima_api.c | 88 +++++++++++++++++++++---------- security/integrity/ima/ima_init.c | 24 +++++---- 3 files changed, 76 insertions(+), 39 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 27d2ffbd0763..da03d3389619 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -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); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index a0fe5041310a..29dd43de823a 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -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) diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index d42fac308aaa..50e15e6336c4 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -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) -- 2.20.1