RE: [PATCH OLK-5.10] Add macros to isolate the IMA digest list

From: Zhou Shuiqing [mailto:zhoushuiqing2@huawei.com] Sent: Wednesday, August 16, 2023 10:44 AM Isolate the IMA digest list code by using macros.

Signed-off-by: Zhou Shuiqing zhoushuiqing2@huawei.com

fs/xattr.c | 4 + include/linux/ima.h | 8 + security/integrity/digsig_asymmetric.c | 4 + security/integrity/evm/evm.h | 2 + security/integrity/evm/evm_crypto.c | 38 +++- security/integrity/evm/evm_main.c | 146 +++++++++++++ security/integrity/iint.c | 4 + security/integrity/ima/ima.h | 80 ++++++- security/integrity/ima/ima_api.c | 39 ++++ security/integrity/ima/ima_appraise.c | 128 ++++++++++- security/integrity/ima/ima_fs.c | 247 +++++++++++++++++++++- security/integrity/ima/ima_init.c | 8 + security/integrity/ima/ima_main.c | 36 +++- security/integrity/ima/ima_policy.c | 80 +++++++ security/integrity/ima/ima_template.c | 2 + security/integrity/ima/ima_template_lib.c | 8 + security/integrity/ima/ima_template_lib.h | 2 + security/integrity/integrity.h | 15 +- security/security.c | 2 + 19 files changed, 840 insertions(+), 13 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c index 149b8cf5f99f..c31266a83391 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -16,7 +16,9 @@ #include <linux/namei.h> #include <linux/security.h> #include <linux/evm.h> +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/ima.h> +#endif #include <linux/syscalls.h> #include <linux/export.h> #include <linux/fsnotify.h> @@ -475,7 +477,9 @@ __vfs_removexattr_locked(struct dentry *dentry, const char *name,

if (!error) { fsnotify_xattr(dentry); +#ifdef CONFIG_IMA_DIGEST_LIST ima_inode_post_removexattr(dentry, name); +#endif

Hi Shuiqing

probably this patch could be simplified by excluding the parts that are also merged in the upstream kernel.

In some cases, the maintainers asked to revise the patches I made for openEuler, so there could be some differences.

Maybe, an easier way to achieve the goal would be to only disable loading and searching in the digest lists, so that you don't have to make too many changes.

If there are more specific problems that require disabling the feature, please let me know.

Thanks

Roberto

evm_inode_post_removexattr(dentry, name);

}

diff --git a/include/linux/ima.h b/include/linux/ima.h index f7a088b2579e..713c6f9696cb 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -144,13 +144,17 @@ extern bool is_ima_appraise_enabled(void); extern void ima_inode_post_setattr(struct dentry *dentry); extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len); +#ifdef CONFIG_IMA_DIGEST_LIST extern void ima_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len); +#endif extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name); +#ifdef CONFIG_IMA_DIGEST_LIST extern void ima_inode_post_removexattr(struct dentry *dentry, const char *xattr_name); +#endif #else static inline bool is_ima_appraise_enabled(void) { @@ -170,12 +174,14 @@ static inline int ima_inode_setxattr(struct dentry *dentry, return 0; }

+#ifdef CONFIG_IMA_DIGEST_LIST static inline void ima_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len) { } +#endif

static inline int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) @@ -183,10 +189,12 @@ static inline int ima_inode_removexattr(struct dentry *dentry, return 0; }

+#ifdef CONFIG_IMA_DIGEST_LIST static inline void ima_inode_post_removexattr(struct dentry *dentry, const char *xattr_name) { } +#endif #endif /* CONFIG_IMA_APPRAISE */

#if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING) diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c index 92dc64755e53..72941f9b1b99 100644 --- a/security/integrity/digsig_asymmetric.c +++ b/security/integrity/digsig_asymmetric.c @@ -9,7 +9,9 @@ #include <linux/err.h> #include <linux/ratelimit.h> #include <linux/key-type.h> +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/verification.h> +#endif #include <crypto/public_key.h> #include <crypto/hash_info.h> #include <keys/asymmetric-type.h> @@ -55,6 +57,7 @@ static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid) key = request_key(&key_type_asymmetric, name, NULL); }

+#ifdef CONFIG_IMA_DIGEST_LIST if (IS_ERR(key)) { #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY keyring = VERIFY_USE_SECONDARY_KEYRING; @@ -63,6 +66,7 @@ static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid) #endif key = search_trusted_key(keyring, &key_type_asymmetric, name); } +#endif

if (IS_ERR(key)) { if (keyring) diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h index ca7ed2e532dc..f8b1627708a1 100644 --- a/security/integrity/evm/evm.h +++ b/security/integrity/evm/evm.h @@ -32,7 +32,9 @@ struct xattr_list { };

extern int evm_initialized; +#ifdef CONFIG_IMA_DIGEST_LIST extern enum hash_algo evm_hash_algo; +#endif

#define EVM_ATTR_FSUUID 0x0001

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c index 7c36dbb96d24..fa8147c2294e 100644 --- a/security/integrity/evm/evm_crypto.c +++ b/security/integrity/evm/evm_crypto.c @@ -33,7 +33,11 @@ static DEFINE_MUTEX(mutex);

static unsigned long evm_set_key_flags;

+#ifdef CONFIG_IMA_DIGEST_LIST enum hash_algo evm_hash_algo __ro_after_init = HASH_ALGO_SHA1; +#else +static const char evm_hmac[] = "hmac(sha1)"; +#endif

/**

• evm_set_key() - set EVM HMAC key from the kernel

@@ -74,11 +78,13 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo) long rc; const char *algo; struct crypto_shash **tfm, *tmp_tfm;

• char evm_hmac[CRYPTO_MAX_ALG_NAME]; struct shash_desc *desc;

+#ifdef CONFIG_IMA_DIGEST_LIST

• char evm_hmac[CRYPTO_MAX_ALG_NAME];

  snprintf(evm_hmac, sizeof(evm_hmac), "hmac(%s)", CONFIG_EVM_DEFAULT_HASH);

+#endif

if (type == EVM_XATTR_HMAC) { if (!(evm_initialized & EVM_INIT_HMAC)) { @@ -156,8 +162,12 @@ static void hmac_add_misc(struct shash_desc *desc, struct inode *inode, /* Don't include the inode or generation number in portable * signatures */ +#ifdef CONFIG_IMA_DIGEST_LIST if (type != EVM_XATTR_PORTABLE_DIGSIG && type != EVM_IMA_XATTR_DIGEST_LIST) { +#else

• if (type != EVM_XATTR_PORTABLE_DIGSIG) {

+#endif hmac_misc.ino = inode->i_ino; hmac_misc.generation = inode->i_generation; } @@ -174,8 +184,12 @@ static void hmac_add_misc(struct shash_desc *desc, struct inode *inode, hmac_misc.mode = inode->i_mode; crypto_shash_update(desc, (const u8 *)&hmac_misc, sizeof(hmac_misc)); if ((evm_hmac_attrs & EVM_ATTR_FSUUID) && +#ifdef CONFIG_IMA_DIGEST_LIST type != EVM_XATTR_PORTABLE_DIGSIG && type != EVM_IMA_XATTR_DIGEST_LIST) +#else

• type != EVM_XATTR_PORTABLE_DIGSIG)
  

+#endif crypto_shash_update(desc, (u8 *)&inode->i_sb->s_uuid, UUID_SIZE); crypto_shash_final(desc, digest); } @@ -288,8 +302,12 @@ static int evm_is_immutable(struct dentry *dentry, struct inode *inode) return 0; return rc; } +#ifdef CONFIG_IMA_DIGEST_LIST if (xattr_data->type == EVM_XATTR_PORTABLE_DIGSIG || xattr_data->type == EVM_IMA_XATTR_DIGEST_LIST) +#else

• if (xattr_data->type == EVM_XATTR_PORTABLE_DIGSIG)

+#endif rc = 1; else rc = 0; @@ -321,15 +339,23 @@ int evm_update_evmxattr(struct dentry *dentry, const char *xattr_name, if (rc) return -EPERM;

+#ifdef CONFIG_IMA_DIGEST_LIST data.hdr.algo = evm_hash_algo; +#else

• data.hdr.algo = HASH_ALGO_SHA1;

+#endif rc = evm_calc_hmac(dentry, xattr_name, xattr_value, xattr_value_len, &data); if (rc == 0) { data.hdr.xattr.sha1.type = EVM_XATTR_HMAC; rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_EVM, &data.hdr.xattr.data[1], +#ifdef CONFIG_IMA_DIGEST_LIST hash_digest_size[evm_hash_algo] + 1, 0); +#else

• 			   SHA1_DIGEST_SIZE + 1, 0);
  

+#endif } else if (rc == -ENODATA && (inode->i_opflags & IOP_XATTR)) { rc = __vfs_removexattr(dentry, XATTR_NAME_EVM); } @@ -341,7 +367,11 @@ int evm_init_hmac(struct inode *inode, const struct xattr *lsm_xattr, { struct shash_desc *desc;

+#ifdef CONFIG_IMA_DIGEST_LIST desc = init_desc(EVM_XATTR_HMAC, evm_hash_algo); +#else

• desc = init_desc(EVM_XATTR_HMAC, HASH_ALGO_SHA1);

+#endif if (IS_ERR(desc)) { pr_info("init_desc failed\n"); return PTR_ERR(desc); @@ -353,9 +383,15 @@ int evm_init_hmac(struct inode *inode, const struct xattr *lsm_xattr, return 0; }

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• Get the key from the TPM for the HMAC

*/ +#else +/*

• • Get the key from the TPM for the SHA1-HMAC
• */

+#endif int evm_init_key(void) { struct key *evm_key; diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c index cddfc0e43a80..fe767feb722d 100644 --- a/security/integrity/evm/evm_main.c +++ b/security/integrity/evm/evm_main.c @@ -18,7 +18,9 @@ #include <linux/integrity.h> #include <linux/evm.h> #include <linux/magic.h> +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/posix_acl_xattr.h> +#endif

#include <crypto/hash.h> #include <crypto/hash_info.h> @@ -28,8 +30,12 @@ int evm_initialized;

static const char * const integrity_status_msg[] = { +#ifdef CONFIG_IMA_DIGEST_LIST "pass", "pass_immutable", "fail", "fail_immutable", "no_label", "no_xattrs", "unknown" +#else

• "pass", "pass_immutable", "fail", "no_label", "no_xattrs", "unknown"

+#endif }; int evm_hmac_attrs;

@@ -57,6 +63,7 @@ static struct xattr_list evm_config_default_xattrnames[] = { LIST_HEAD(evm_config_xattrnames);

static int evm_fixmode __ro_after_init; +#ifdef CONFIG_IMA_DIGEST_LIST static int __init evm_set_param(char *str) { if (strncmp(str, "fix", 3) == 0) @@ -73,6 +80,18 @@ static int __init evm_set_param(char *str) return 1; } __setup("evm=", evm_set_param); +#else +static int __init evm_set_fixmode(char *str) +{

• if (strncmp(str, "fix", 3) == 0)

• evm_fixmode = 1;
  

• else

• pr_err("invalid \"%s\" mode", str);
  

• return 0;

+} +__setup("evm=", evm_set_fixmode); +#endif

static void __init evm_init_config(void) { @@ -98,6 +117,7 @@ static bool evm_key_loaded(void) return (bool)(evm_initialized & EVM_KEY_MASK); }

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• Ignoring INTEGRITY_NOLABEL/INTEGRITY_NOXATTRS is safe if no HMAC key
• is loaded and the EVM_SETUP_COMPLETE initialization flag is set.

@@ -115,8 +135,13 @@ static bool evm_ignore_error_safe(enum integrity_status evm_status)

return true; } +#endif

+#ifdef CONFIG_IMA_DIGEST_LIST static int evm_find_protected_xattrs(struct dentry *dentry, int *ima_present) +#else +static int evm_find_protected_xattrs(struct dentry *dentry) +#endif { struct inode *inode = d_backing_inode(dentry); struct xattr_list *xattr; @@ -133,8 +158,10 @@ static int evm_find_protected_xattrs(struct dentry *dentry, int *ima_present) continue; return error; } +#ifdef CONFIG_IMA_DIGEST_LIST if (!strcmp(xattr->name, XATTR_NAME_IMA)) *ima_present = 1; +#endif count++; }

@@ -163,6 +190,7 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, struct evm_ima_xattr_data *xattr_data = NULL; struct signature_v2_hdr *hdr; enum integrity_status evm_status = INTEGRITY_PASS; +#ifdef CONFIG_IMA_DIGEST_LIST enum integrity_status saved_evm_status = INTEGRITY_UNKNOWN; struct evm_digest digest; struct ima_digest *found_digest; @@ -172,6 +200,12 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, .version = 2, .hash_algo = HASH_ALGO_SHA256 }; int rc, xattr_len, evm_immutable = 0, ima_present = 0;

+#else

• struct evm_digest digest;
• struct inode *inode;
• int rc, xattr_len;

+#endif

• if (iint && (iint->evm_status == INTEGRITY_PASS || iint->evm_status == INTEGRITY_PASS_IMMUTABLE)) return iint->evm_status;

@@ -184,7 +218,11 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, if (rc <= 0) { evm_status = INTEGRITY_FAIL; if (rc == -ENODATA) { +#ifdef CONFIG_IMA_DIGEST_LIST rc = evm_find_protected_xattrs(dentry, &ima_present); +#else

• 	rc = evm_find_protected_xattrs(dentry);
  

+#endif if (rc > 0) evm_status = INTEGRITY_NOLABEL; else if (rc == 0) @@ -192,6 +230,7 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, } else if (rc == -EOPNOTSUPP) { evm_status = INTEGRITY_UNKNOWN; } +#ifdef CONFIG_IMA_DIGEST_LIST /* IMA added a fake xattr, set also EVM fake xattr */ if (!ima_present && xattr_name && !strcmp(xattr_name, XATTR_NAME_IMA) && @@ -206,6 +245,9 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, goto out;

saved_evm_status = evm_status;

+#else

• goto out;
  

+#endif }

xattr_len = rc; @@ -213,6 +255,7 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, /* check value type */ switch (xattr_data->type) { case EVM_XATTR_HMAC: +#ifdef CONFIG_IMA_DIGEST_LIST if (xattr_len != hash_digest_size[evm_hash_algo] + 1) { evm_status = INTEGRITY_FAIL; goto out; @@ -231,6 +274,25 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, evm_immutable = 1; fallthrough; case EVM_IMA_XATTR_DIGSIG: +#else

• if (xattr_len != sizeof(struct evm_xattr)) {
  

• 	evm_status = INTEGRITY_FAIL;
  

• 	goto out;
  

• }
  

• digest.hdr.algo = HASH_ALGO_SHA1;
  

• rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
  

• 		   xattr_value_len, &digest);
  

• if (rc)
  

• 	break;
  

• rc = crypto_memneq(xattr_data->data, digest.digest,
  

• 		   SHA1_DIGEST_SIZE);
  

• if (rc)
  

• 	rc = -EINVAL;
  

• break;
  

• case EVM_IMA_XATTR_DIGSIG:
• case EVM_XATTR_PORTABLE_DIGSIG:

+#endif /* accept xattr with non-empty signature field */ if (xattr_len <= sizeof(struct signature_v2_hdr)) { evm_status = INTEGRITY_FAIL; @@ -262,6 +324,7 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, } } break; +#ifdef CONFIG_IMA_DIGEST_LIST case EVM_IMA_XATTR_DIGEST_LIST: /* At this point, we cannot determine whether metadata are * immutable or not. However, it is safe to return the @@ -302,11 +365,13 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, evm_status = INTEGRITY_PASS; } break; +#endif default: rc = -EINVAL; break; }

+#ifdef CONFIG_IMA_DIGEST_LIST if (rc && xattr_data == (struct evm_ima_xattr_data *)&evm_fake_xattr) { evm_status = saved_evm_status; } else if (rc) { @@ -315,10 +380,17 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry, evm_status = evm_immutable ? INTEGRITY_FAIL_IMMUTABLE : INTEGRITY_FAIL; } +#else

• if (rc)

• evm_status = (rc == -ENODATA) ?
  

• 		INTEGRITY_NOXATTRS : INTEGRITY_FAIL;
  

+#endif out: if (iint) iint->evm_status = evm_status; +#ifdef CONFIG_IMA_DIGEST_LIST if (xattr_data != (struct evm_ima_xattr_data *)&evm_fake_xattr) +#endif kfree(xattr_data); return evm_status; } @@ -397,6 +469,7 @@ static enum integrity_status evm_verify_current_integrity(struct dentry *dentry) return evm_verify_hmac(dentry, NULL, NULL, 0, NULL); }

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• evm_xattr_acl_change - check if passed ACL changes the inode mode
• @dentry: pointer to the affected dentry

@@ -468,6 +541,7 @@ static int evm_xattr_change(struct dentry *dentry, const char *xattr_name, kfree(xattr_data); return rc; } +#endif

/*

• evm_protect_xattr - protect the EVM extended attribute

@@ -519,6 +593,7 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name, -EPERM, 0); } out: +#ifdef CONFIG_IMA_DIGEST_LIST if (evm_ignore_error_safe(evm_status)) return 0;

@@ -532,6 +607,7 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name, if (evm_status == INTEGRITY_PASS_IMMUTABLE && !evm_xattr_change(dentry, xattr_name, xattr_value, xattr_value_len)) return 0; +#endif

if (evm_status != INTEGRITY_PASS) integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry), @@ -569,8 +645,12 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name, if (!xattr_value_len) return -EINVAL; if (xattr_data->type != EVM_IMA_XATTR_DIGSIG && +#ifdef CONFIG_IMA_DIGEST_LIST xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG && xattr_data->type != EVM_IMA_XATTR_DIGEST_LIST) +#else

•     xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG)
  

+#endif return -EPERM; } return evm_protect_xattr(dentry, xattr_name, xattr_value, @@ -605,6 +685,7 @@ static void evm_reset_status(struct inode *inode) iint->evm_status = INTEGRITY_UNKNOWN; }

+#ifdef CONFIG_IMA_DIGEST_LIST /**

• evm_status_revalidate - report whether EVM status re-validation is necessary
• @xattr_name: pointer to the affected extended attribute name

@@ -629,6 +710,7 @@ bool evm_status_revalidate(const char *xattr_name)

return true; } +#endif

/**

• evm_inode_post_setxattr - update 'security.evm' to reflect the changes

@@ -646,13 +728,20 @@ bool evm_status_revalidate(const char *xattr_name) void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len) { +#ifdef CONFIG_IMA_DIGEST_LIST if (!evm_status_revalidate(xattr_name)) +#else

• if (!evm_key_loaded() || (!evm_protected_xattr(xattr_name)

• 		  && !posix_xattr_acl(xattr_name)))
  

+#endif return;

evm_reset_status(dentry->d_inode);

+#ifdef CONFIG_IMA_DIGEST_LIST if (!strcmp(xattr_name, XATTR_NAME_EVM)) return; +#endif

evm_update_evmxattr(dentry, xattr_name, xattr_value, xattr_value_len); } @@ -669,17 +758,24 @@ void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, */ void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name) { +#ifdef CONFIG_IMA_DIGEST_LIST if (!evm_status_revalidate(xattr_name)) +#else

• if (!evm_key_loaded() || !evm_protected_xattr(xattr_name))

+#endif return;

evm_reset_status(dentry->d_inode);

+#ifdef CONFIG_IMA_DIGEST_LIST if (!strcmp(xattr_name, XATTR_NAME_EVM)) return; +#endif

evm_update_evmxattr(dentry, xattr_name, NULL, 0); }

+#ifdef CONFIG_IMA_DIGEST_LIST static int evm_attr_change(struct dentry *dentry, struct iattr *attr) { struct inode *inode = d_backing_inode(dentry); @@ -692,6 +788,7 @@ static int evm_attr_change(struct dentry *dentry, struct iattr *attr)

return 1; } +#endif

/**

• evm_inode_setattr - prevent updating an invalid EVM extended attribute

@@ -714,6 +811,7 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr) if (!(ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))) return 0; evm_status = evm_verify_current_integrity(dentry); +#ifdef CONFIG_IMA_DIGEST_LIST /* * Writing attrs is safe for portable signatures, as portable signatures * are immutable and can never be updated. @@ -727,6 +825,11 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr) if (evm_status == INTEGRITY_PASS_IMMUTABLE && !evm_attr_change(dentry, attr)) return 0; +#else

• if ((evm_status == INTEGRITY_PASS) ||

•    (evm_status == INTEGRITY_NOXATTRS))
  

• return 0;
  

+#endif

integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry), dentry->d_name.name, "appraise_metadata", @@ -747,15 +850,21 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr) */ void evm_inode_post_setattr(struct dentry *dentry, int ia_valid) { +#ifdef CONFIG_IMA_DIGEST_LIST if (!evm_status_revalidate(NULL)) return;

evm_reset_status(dentry->d_inode); +#else

• if (!evm_key_loaded())

• return;
  

+#endif

if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)) evm_update_evmxattr(dentry, NULL, NULL, 0); }

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• evm_inode_init_security - initializes security.evm HMAC value

*/ @@ -787,6 +896,38 @@ int evm_inode_init_security(struct inode *inode, kfree(xattr_data); return rc; } +#else +/*

• • evm_inode_init_security - initializes security.evm
• */

+int evm_inode_init_security(struct inode *inode,

• 		 const struct xattr *lsm_xattr,
  

• 		 struct xattr *evm_xattr)
  

+{

• struct evm_xattr *xattr_data;
• int rc;
• if (!evm_key_loaded() || !evm_protected_xattr(lsm_xattr->name))

• return 0;
  

• xattr_data = kzalloc(sizeof(*xattr_data), GFP_NOFS);
• if (!xattr_data)

• return -ENOMEM;
  

• xattr_data->data.type = EVM_XATTR_HMAC;
• rc = evm_init_hmac(inode, lsm_xattr, xattr_data->digest);
• if (rc < 0)

• goto out;
  

• evm_xattr->value = xattr_data;
• evm_xattr->value_len = sizeof(*xattr_data);
• evm_xattr->name = XATTR_EVM_SUFFIX;
• return 0;

+out:

• kfree(xattr_data);
• return rc;

+} +#endif EXPORT_SYMBOL_GPL(evm_inode_init_security);

#ifdef CONFIG_EVM_LOAD_X509 @@ -802,6 +943,7 @@ void __init evm_load_x509(void)

static int __init init_evm(void) { +#ifdef CONFIG_IMA_DIGEST_LIST int error, i; struct list_head *pos, *q;

@@ -809,6 +951,10 @@ static int __init init_evm(void) CONFIG_EVM_DEFAULT_HASH); if (i >= 0) evm_hash_algo = i; +#else

• int error;
• struct list_head *pos, *q;

+#endif

evm_init_config();

diff --git a/security/integrity/iint.c b/security/integrity/iint.c index 8953ac6412c3..df994202ac0f 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -209,10 +209,14 @@ void __init integrity_load_keys(void) { ima_load_x509();

+#ifdef CONFIG_IMA_DIGEST_LIST if (!IS_ENABLED(CONFIG_IMA_LOAD_X509)) evm_load_x509();

ima_load_digest_lists(); +#else

• evm_load_x509();

+#endif }

static int __init integrity_fs_init(void) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 46afb6bef45b..e512a17b09dd 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -53,11 +53,11 @@ extern int ima_hash_algo_idx __ro_after_init; extern int ima_extra_slots __ro_after_init; extern int ima_appraise; extern struct tpm_chip *ima_tpm_chip; +extern const char boot_aggregate_name[]; +#ifdef CONFIG_IMA_DIGEST_LIST extern int ima_digest_list_pcr; extern bool ima_plus_standard_pcr; -extern const char boot_aggregate_name[]; extern int ima_digest_list_actions; -#ifdef CONFIG_IMA_DIGEST_LIST extern int ima_digest_db_max_size __ro_after_init; extern int ima_digest_db_size; #endif @@ -189,6 +189,7 @@ static inline unsigned int ima_hash_key(u8 *digest) return (digest[0] | digest[1] << 8) % IMA_MEASURE_HTABLE_SIZE; }

+#ifdef CONFIG_IMA_DIGEST_LIST #define __ima_hooks(hook) \ hook(NONE, none) \ hook(FILE_CHECK, file) \ @@ -205,6 +206,23 @@ static inline unsigned int ima_hash_key(u8 *digest) hook(KEY_CHECK, key) \ hook(DIGEST_LIST_CHECK, digest_list) \ hook(MAX_CHECK, none) +#else +#define __ima_hooks(hook) \

• hook(NONE, none) \
• hook(FILE_CHECK, file) \
• hook(MMAP_CHECK, mmap) \
• hook(BPRM_CHECK, bprm) \
• hook(CREDS_CHECK, creds) \
• hook(POST_SETATTR, post_setattr) \
• hook(MODULE_CHECK, module) \
• hook(FIRMWARE_CHECK, firmware) \
• hook(KEXEC_KERNEL_CHECK, kexec_kernel) \
• hook(KEXEC_INITRAMFS_CHECK, kexec_initramfs) \
• hook(POLICY_CHECK, policy) \
• hook(KEXEC_CMDLINE, kexec_cmdline) \
• hook(KEY_CHECK, key) \
• hook(MAX_CHECK, none)

+#endif

#define __ima_hook_enumify(ENUM, str) ENUM, #define __ima_stringify(arg) (#arg) @@ -264,12 +282,20 @@ int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func); int ima_collect_measurement(struct integrity_iint_cache *iint, struct file *file, void *buf, loff_t size, enum hash_algo algo, struct modsig *modsig); +#ifdef CONFIG_IMA_DIGEST_LIST void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, struct ima_template_desc *template_desc, struct ima_digest *digest); +#else +void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,

• 	   const unsigned char *filename,
  

• 	   struct evm_ima_xattr_data *xattr_value,
  

• 	   int xattr_len, const struct modsig *modsig, int pcr,
  

• 	   struct ima_template_desc *template_desc);
  

+#endif void process_buffer_measurement(struct inode *inode, const void *buf, int size, const char *eventname, enum ima_hooks func, int pcr, const char *keyring); @@ -278,9 +304,15 @@ void ima_audit_measurement(struct integrity_iint_cache *iint, int ima_alloc_init_template(struct ima_event_data *event_data, struct ima_template_entry **entry, struct ima_template_desc *template_desc); +#ifdef CONFIG_IMA_DIGEST_LIST int ima_store_template(struct ima_template_entry *entry, int violation, struct inode *inode, const unsigned char *filename, int pcr, struct ima_digest *digest); +#else +int ima_store_template(struct ima_template_entry *entry, int violation,

•        struct inode *inode,
  

•        const unsigned char *filename, int pcr);
  

+#endif void ima_free_template_entry(struct ima_template_entry *entry); const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);

@@ -308,21 +340,41 @@ int ima_policy_show(struct seq_file *m, void *v); #define IMA_APPRAISE_FIRMWARE 0x10 #define IMA_APPRAISE_POLICY 0x20 #define IMA_APPRAISE_KEXEC 0x40 +#ifdef CONFIG_IMA_DIGEST_LIST #define IMA_APPRAISE_DIGEST_LIST 0x80 +#endif

#ifdef CONFIG_IMA_APPRAISE int ima_check_blacklist(struct integrity_iint_cache *iint, const struct modsig *modsig, int pcr);

+#ifdef CONFIG_IMA_DIGEST_LIST int ima_appraise_measurement(enum ima_hooks func, struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, struct ima_digest *found_digest); +#else +int ima_appraise_measurement(enum ima_hooks func,

• 	     struct integrity_iint_cache *iint,
  

• 	     struct file *file, const unsigned char *filename,
  

• 	     struct evm_ima_xattr_data *xattr_value,
  

• 	     int xattr_len, const struct modsig *modsig);
  

+#endif

int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func); void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file); enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint, enum ima_hooks func);

+#ifndef CONFIG_IMA_DIGEST_LIST +enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,

• 		 int xattr_len);
  

+int ima_read_xattr(struct dentry *dentry,

•    struct evm_ima_xattr_data **xattr_value);
  

+#endif

#else static inline int ima_check_blacklist(struct integrity_iint_cache *iint, const struct modsig *modsig, int pcr) @@ -330,6 +382,7 @@ static inline int ima_check_blacklist(struct integrity_iint_cache *iint, return 0; }

+#ifndef CONFIG_IMA_DIGEST_LIST static inline int ima_appraise_measurement(enum ima_hooks func, struct integrity_iint_cache *iint, struct file *file, @@ -338,6 +391,15 @@ static inline int ima_appraise_measurement(enum ima_hooks func, int xattr_len, const struct modsig *modsig, struct ima_digest *found_digest) +#else +static inline int ima_appraise_measurement(enum ima_hooks func,

• 			   struct integrity_iint_cache *iint,
  

• 			   struct file *file,
  

• 			   const unsigned char *filename,
  

• 			   struct evm_ima_xattr_data *xattr_value,
  

• 			   int xattr_len,
  

• 			   const struct modsig *modsig)
  

+#endif { return INTEGRITY_UNKNOWN; } @@ -360,6 +422,20 @@ static inline enum integrity_status ima_get_cache_status(struct integrity_iint_c return INTEGRITY_UNKNOWN; }

+#ifndef CONFIG_IMA_DIGEST_LIST +static inline enum hash_algo +ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len) +{

• return ima_hash_algo;

+}

+static inline int ima_read_xattr(struct dentry *dentry,

• 		 struct evm_ima_xattr_data **xattr_value)
  

+{

• return 0;

+} +#endif

#endif /* CONFIG_IMA_APPRAISE */

#ifdef CONFIG_IMA_APPRAISE_MODSIG diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index 6ecaf6834844..1b8d3696d873 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -99,15 +99,23 @@ int ima_alloc_init_template(struct ima_event_data *event_data,

• Returns 0 on success, error code otherwise

*/ +#ifdef CONFIG_IMA_DIGEST_LIST int ima_store_template(struct ima_template_entry *entry, int violation, struct inode *inode, const unsigned char *filename, int pcr, struct ima_digest *digest) +#else +int ima_store_template(struct ima_template_entry *entry,

•        int violation, struct inode *inode,
  

•        const unsigned char *filename, int pcr)
  

+#endif { static const char op[] = "add_template_measure"; static const char audit_cause[] = "hashing_error"; char *template_name = entry->template_desc->name; +#ifdef CONFIG_IMA_DIGEST_LIST struct ima_template_entry *duplicated_entry = NULL; +#endif int result;

if (!violation) { @@ -121,6 +129,7 @@ int ima_store_template(struct ima_template_entry *entry, } }

+#ifdef CONFIG_IMA_DIGEST_LIST if (ima_plus_standard_pcr && !digest) { duplicated_entry = kmemdup(entry, sizeof(*entry) + entry->template_desc->num_fields * @@ -130,9 +139,11 @@ int ima_store_template(struct ima_template_entry *entry, } else if (!ima_plus_standard_pcr && ima_digest_list_pcr >= 0) { pcr = ima_digest_list_pcr; } +#endif

entry->pcr = pcr; result = ima_add_template_entry(entry, violation, op, inode, filename); +#ifdef CONFIG_IMA_DIGEST_LIST if (result) { kfree(duplicated_entry); } else if (duplicated_entry) { @@ -141,6 +152,7 @@ int ima_store_template(struct ima_template_entry *entry, if (result < 0) kfree(duplicated_entry); } +#endif

return result; } @@ -173,8 +185,13 @@ void ima_add_violation(struct file *file, const unsigned char *filename, result = -ENOMEM; goto err_out; } +#ifdef CONFIG_IMA_DIGEST_LIST result = ima_store_template(entry, violation, inode, filename, CONFIG_IMA_MEASURE_PCR_IDX, NULL); +#else

• result = ima_store_template(entry, violation, inode,

• 		    filename, CONFIG_IMA_MEASURE_PCR_IDX);
  

+#endif if (result < 0) ima_free_template_entry(entry); err_out: @@ -315,18 +332,30 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,

• Must be called with iint->mutex held.

*/ +#ifdef CONFIG_IMA_DIGEST_LIST void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, int pcr, struct ima_template_desc *template_desc, struct ima_digest *digest) +#else +void ima_store_measurement(struct integrity_iint_cache *iint,

• 	   struct file *file, const unsigned char *filename,
  

• 	   struct evm_ima_xattr_data *xattr_value,
  

• 	   int xattr_len, const struct modsig *modsig, int pcr,
  

• 	   struct ima_template_desc *template_desc)
  

+#endif { static const char op[] = "add_template_measure"; static const char audit_cause[] = "ENOMEM"; int result = -ENOMEM; struct inode *inode = file_inode(file); +#ifdef CONFIG_IMA_DIGEST_LIST struct ima_template_entry *entry = NULL; +#else

• struct ima_template_entry *entry;

+#endif struct ima_event_data event_data = { .iint = iint, .file = file, .filename = filename, @@ -344,10 +373,12 @@ void ima_store_measurement(struct integrity_iint_cache *iint, if (iint->measured_pcrs & (0x1 << pcr) && !modsig) return;

+#ifdef CONFIG_IMA_DIGEST_LIST if (digest && !ima_plus_standard_pcr && ima_digest_list_pcr >= 0) { result = -EEXIST; goto out; } +#endif

result = ima_alloc_init_template(&event_data, &entry, template_desc); if (result < 0) { @@ -356,14 +387,22 @@ void ima_store_measurement(struct integrity_iint_cache *iint, return; }

+#ifdef CONFIG_IMA_DIGEST_LIST result = ima_store_template(entry, violation, inode, filename, pcr, digest); out: +#else

• result = ima_store_template(entry, violation, inode, filename, pcr);

+#endif if ((!result || result == -EEXIST) && !(file->f_flags & O_DIRECT)) { iint->flags |= IMA_MEASURED; iint->measured_pcrs |= (0x1 << pcr); } +#ifdef CONFIG_IMA_DIGEST_LIST if (result < 0 && entry) +#else

• if (result < 0)

+#endif ima_free_template_entry(entry); }

diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 956fb0f4c006..e5e071fa8565 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -15,9 +15,11 @@ #include <keys/system_keyring.h>

#include "ima.h" +#ifdef CONFIG_IMA_DIGEST_LIST #include "ima_digest_list.h"

static bool ima_appraise_req_evm __ro_after_init; +#endif static int __init default_appraise_setup(char *str) { #ifdef CONFIG_IMA_APPRAISE_BOOTPARAM @@ -45,16 +47,18 @@ static int __init default_appraise_setup(char *str) ima_appraise = appraisal_state; } #endif +#ifdef CONFIG_IMA_DIGEST_LIST if (strcmp(str, "enforce-evm") == 0 || strcmp(str, "log-evm") == 0) ima_appraise_req_evm = true; +#endif return 1; }

__setup("ima_appraise=", default_appraise_setup);

-static bool ima_appraise_no_metadata __ro_after_init; #ifdef CONFIG_IMA_DIGEST_LIST +static bool ima_appraise_no_metadata __ro_after_init; static int __init appraise_digest_list_setup(char *str) { if (!strncmp(str, "digest", 6)) { @@ -108,9 +112,11 @@ static int ima_fix_xattr(struct dentry *dentry, } else { offset = 0; iint->ima_hash->xattr.ng.type = IMA_XATTR_DIGEST_NG; +#ifdef CONFIG_IMA_DIGEST_LIST if (test_bit(IMA_DIGEST_LIST, &iint->atomic_flags)) iint->ima_hash->xattr.ng.type = EVM_IMA_XATTR_DIGEST_LIST; +#endif iint->ima_hash->xattr.ng.algo = algo; } rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA, @@ -189,6 +195,60 @@ static void ima_cache_flags(struct integrity_iint_cache *iint, } }

+#ifndef CONFIG_IMA_DIGEST_LIST +enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value,

• 		 int xattr_len)
  

+{

• struct signature_v2_hdr *sig;
• enum hash_algo ret;
• if (!xattr_value || xattr_len < 2)

• /* return default hash algo */
  

• return ima_hash_algo;
  

• switch (xattr_value->type) {
• case EVM_IMA_XATTR_DIGSIG:

• sig = (typeof(sig))xattr_value;
  

• if (sig->version != 2 || xattr_len <= sizeof(*sig))
  

• 	return ima_hash_algo;
  

• return sig->hash_algo;
  

• break;
  

• case IMA_XATTR_DIGEST_NG:

• /* first byte contains algorithm id */
  

• ret = xattr_value->data[0];
  

• if (ret < HASH_ALGO__LAST)
  

• 	return ret;
  

• break;
  

• case IMA_XATTR_DIGEST:

• /* this is for backward compatibility */
  

• if (xattr_len == 21) {
  

• 	unsigned int zero = 0;
  

• 	if (!memcmp(&xattr_value->data[16], &zero, 4))
  

• 		return HASH_ALGO_MD5;
  

• 	else
  

• 		return HASH_ALGO_SHA1;
  

• } else if (xattr_len == 17)
  

• 	return HASH_ALGO_MD5;
  

• break;
  

• }
• /* return default hash algo */
• return ima_hash_algo;

+}

+int ima_read_xattr(struct dentry *dentry,

•    struct evm_ima_xattr_data **xattr_value)
  

+{

• ssize_t ret;
• ret = vfs_getxattr_alloc(dentry, XATTR_NAME_IMA, (char **)xattr_value,

• 		 0, GFP_NOFS);
  

• if (ret == -EOPNOTSUPP)

• ret = 0;
  

• return ret;

+} +#endif

/*

• xattr_verify - verify xattr digest or signature

@@ -196,18 +256,27 @@ static void ima_cache_flags(struct integrity_iint_cache *iint,

• Return 0 on success, error code otherwise.

*/ +#ifdef CONFIG_IMA_DIGEST_LIST static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint, struct evm_ima_xattr_data *xattr_value, int xattr_len, enum integrity_status *status, const char **cause, struct ima_digest *found_digest) +#else +static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint,

• 	struct evm_ima_xattr_data *xattr_value, int xattr_len,
  

• 	enum integrity_status *status, const char **cause)
  

+#endif { int rc = -EINVAL, hash_start = 0;

+#ifdef CONFIG_IMA_DIGEST_LIST if (found_digest && *status != INTEGRITY_PASS && *status != INTEGRITY_PASS_IMMUTABLE) set_bit(IMA_DIGEST_LIST, &iint->atomic_flags); +#endif

switch (xattr_value->type) { +#ifdef CONFIG_IMA_DIGEST_LIST case EVM_IMA_XATTR_DIGEST_LIST: set_bit(IMA_DIGEST_LIST, &iint->atomic_flags);

@@ -217,22 +286,27 @@ static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint, break; } fallthrough; +#endif case IMA_XATTR_DIGEST_NG: /* first byte contains algorithm id */ hash_start = 1; fallthrough; case IMA_XATTR_DIGEST: +#ifdef CONFIG_IMA_DIGEST_LIST if (*status != INTEGRITY_PASS_IMMUTABLE && (!found_digest || !ima_digest_is_immutable(found_digest))) { +#endif if (iint->flags & IMA_DIGSIG_REQUIRED) { *cause = "IMA-signature-required"; *status = INTEGRITY_FAIL; break; } clear_bit(IMA_DIGSIG, &iint->atomic_flags); +#ifdef CONFIG_IMA_DIGEST_LIST } else { set_bit(IMA_DIGSIG, &iint->atomic_flags); } +#endif if (xattr_len - sizeof(xattr_value->type) - hash_start >= iint->ima_hash->length) /* @@ -352,26 +426,39 @@ int ima_check_blacklist(struct integrity_iint_cache *iint,

• Return 0 on success, error code otherwise

*/ +#ifdef CONFIG_IMA_DIGEST_LIST int ima_appraise_measurement(enum ima_hooks func, struct integrity_iint_cache *iint, struct file *file, const unsigned char *filename, struct evm_ima_xattr_data *xattr_value, int xattr_len, const struct modsig *modsig, struct ima_digest *found_digest) +#else +int ima_appraise_measurement(enum ima_hooks func,

• 	     struct integrity_iint_cache *iint,
  

• 	     struct file *file, const unsigned char *filename,
  

• 	     struct evm_ima_xattr_data *xattr_value,
  

• 	     int xattr_len, const struct modsig *modsig)
  

+#endif { static const char op[] = "appraise_data"; const char *cause = "unknown"; struct dentry *dentry = file_dentry(file); struct inode *inode = d_backing_inode(dentry); enum integrity_status status = INTEGRITY_UNKNOWN; +#ifdef CONFIG_IMA_DIGEST_LIST int rc = xattr_len, rc_evm; char _buf[sizeof(struct evm_ima_xattr_data) + 1 + SHA512_DIGEST_SIZE]; +#else

• int rc = xattr_len;

+#endif bool try_modsig = iint->flags & IMA_MODSIG_ALLOWED && modsig;

/* If not appraising a modsig, we need an xattr. */ if (!(inode->i_opflags & IOP_XATTR) && !try_modsig) return INTEGRITY_UNKNOWN;

+#ifdef CONFIG_IMA_DIGEST_LIST if (xattr_value && xattr_value->type == EVM_IMA_XATTR_DIGSIG && xattr_len == sizeof(struct signature_v2_hdr)) rc = -ENODATA; @@ -394,6 +481,7 @@ int ima_appraise_measurement(enum ima_hooks func, rc = xattr_len; } } +#endif

/* If reading the xattr failed and there's no modsig, error out. */ if (rc <= 0 && !try_modsig) { @@ -417,11 +505,15 @@ int ima_appraise_measurement(enum ima_hooks func, switch (status) { case INTEGRITY_PASS: case INTEGRITY_PASS_IMMUTABLE: +#ifdef CONFIG_IMA_DIGEST_LIST break; case INTEGRITY_UNKNOWN: if (ima_appraise_req_evm && xattr_value->type != EVM_IMA_XATTR_DIGSIG && !found_digest) goto out; +#else

• case INTEGRITY_UNKNOWN:

+#endif break; case INTEGRITY_NOXATTRS: /* No EVM protected xattrs. */ /* It's fine not to have xattrs when using a modsig. */ @@ -429,6 +521,7 @@ int ima_appraise_measurement(enum ima_hooks func, break; fallthrough; case INTEGRITY_NOLABEL: /* No security.evm xattr. */ +#ifdef CONFIG_IMA_DIGEST_LIST /* * If the digest-nometadata mode is selected, allow access * without metadata check. EVM will eventually create an HMAC @@ -446,11 +539,14 @@ int ima_appraise_measurement(enum ima_hooks func, ima_digest_is_immutable(found_digest)) break; } +#endif cause = "missing-HMAC"; goto out; +#ifdef CONFIG_IMA_DIGEST_LIST case INTEGRITY_FAIL_IMMUTABLE: set_bit(IMA_DIGSIG, &iint->atomic_flags); fallthrough; +#endif case INTEGRITY_FAIL: /* Invalid HMAC/signature. */ cause = "invalid-HMAC"; goto out; @@ -458,6 +554,7 @@ int ima_appraise_measurement(enum ima_hooks func, WARN_ONCE(true, "Unexpected integrity status %d\n", status); }

+#ifdef CONFIG_IMA_DIGEST_LIST if ((iint->flags & IMA_META_IMMUTABLE_REQUIRED) && status != INTEGRITY_PASS_IMMUTABLE) { status = INTEGRITY_FAIL; @@ -466,10 +563,16 @@ int ima_appraise_measurement(enum ima_hooks func, filename, op, cause, rc, 0); goto out; } +#endif

if (xattr_value) +#ifdef CONFIG_IMA_DIGEST_LIST rc = xattr_verify(func, iint, xattr_value, xattr_len, &status, &cause, found_digest); +#else

• rc = xattr_verify(func, iint, xattr_value, xattr_len, &status,
  

• 		  &cause);
  

+#endif

/* * If we have a modsig and either no imasig or the imasig's key isn't @@ -503,6 +606,7 @@ int ima_appraise_measurement(enum ima_hooks func, status = INTEGRITY_PASS; }

+#ifdef CONFIG_IMA_DIGEST_LIST /* * Permit new files with file/EVM portable signatures, but * without data. @@ -511,6 +615,13 @@ int ima_appraise_measurement(enum ima_hooks func, test_bit(IMA_DIGSIG, &iint->atomic_flags)) { status = INTEGRITY_PASS; } +#else

• /* Permit new files with file signatures, but without data. */
  

• if (inode->i_size == 0 && iint->flags & IMA_NEW_FILE &&
  

•     xattr_value && xattr_value->type == EVM_IMA_XATTR_DIGSIG) {
  

• 	status = INTEGRITY_PASS;
  

• }
  

+#endif

integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, filename,
		    op, cause, rc, 0);

@@ -567,6 +678,10 @@ void ima_inode_post_setattr(struct dentry *dentry) return;

action = ima_must_appraise(inode, MAY_ACCESS, POST_SETATTR); +#ifndef CONFIG_IMA_DIGEST_LIST

• if (!action)

• __vfs_removexattr(dentry, XATTR_NAME_IMA);
  

+#endif iint = integrity_iint_find(inode); if (iint) { set_bit(IMA_CHANGE_ATTR, &iint->atomic_flags); @@ -620,11 +735,16 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, if (result == 1) { if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST)) return -EINVAL; +#ifndef CONFIG_IMA_DIGEST_LIST

• ima_reset_appraise_flags(d_backing_inode(dentry),
  

• 	xvalue->type == EVM_IMA_XATTR_DIGSIG);
  

+#endif result = 0; } return result; }

+#ifdef CONFIG_IMA_DIGEST_LIST void ima_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len) { @@ -641,6 +761,7 @@ void ima_inode_post_setxattr(struct dentry *dentry, const char *xattr_name, if (result == 1 || evm_status_revalidate(xattr_name)) ima_reset_appraise_flags(d_backing_inode(dentry), digsig); } +#endif

int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) { @@ -648,11 +769,15 @@ int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name)

result = ima_protect_xattr(dentry, xattr_name, NULL, 0); if (result == 1) { +#ifndef CONFIG_IMA_DIGEST_LIST

• ima_reset_appraise_flags(d_backing_inode(dentry), 0);
  

+#endif result = 0; } return result; }

+#ifdef CONFIG_IMA_DIGEST_LIST void ima_inode_post_removexattr(struct dentry *dentry, const char *xattr_name) { int result; @@ -661,3 +786,4 @@ void ima_inode_post_removexattr(struct dentry *dentry, const char *xattr_name) if (result == 1 || evm_status_revalidate(xattr_name)) ima_reset_appraise_flags(d_backing_inode(dentry), 0); } +#endif diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index f1bc3e201bd8..4ceee381d58b 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -21,11 +21,15 @@ #include <linux/rcupdate.h> #include <linux/parser.h> #include <linux/vmalloc.h> +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/file.h> +#endif #include <linux/ctype.h>

#include "ima.h" +#ifdef CONFIG_IMA_DIGEST_LIST #include "ima_digest_list.h" +#endif

static DEFINE_MUTEX(ima_write_mutex);

@@ -36,9 +40,11 @@ static struct dentry *ascii_runtime_measurements; static struct dentry *runtime_measurements_count; static struct dentry *violations; static struct dentry *ima_policy; +#ifdef CONFIG_IMA_DIGEST_LIST static struct dentry *digests_count; static struct dentry *digest_list_data; static struct dentry *digest_list_data_del; +#endif

bool ima_canonical_fmt; static int __init default_canonical_fmt_setup(char *str) @@ -52,6 +58,7 @@ __setup("ima_canonical_fmt", default_canonical_fmt_setup);

static int valid_policy = 1;

+#ifdef CONFIG_IMA_DIGEST_LIST static ssize_t ima_show_htable_value(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { @@ -63,19 +70,54 @@ static ssize_t ima_show_htable_value(struct file *filp, char __user *buf, val = &ima_htable.violations; else if (filp->f_path.dentry == runtime_measurements_count) val = &ima_htable.len; -#ifdef CONFIG_IMA_DIGEST_LIST else if (filp->f_path.dentry == digests_count) val = &ima_digests_htable.len; -#endif

len = scnprintf(tmpbuf, sizeof(tmpbuf), "%li\n", atomic_long_read(val)); return simple_read_from_buffer(buf, count, ppos, tmpbuf, len); } +#else +static ssize_t ima_show_htable_value(char __user *buf, size_t count,

• 		     loff_t *ppos, atomic_long_t *val)
  

+{

• char tmpbuf[32]; /* greater than largest 'long' string value */
• ssize_t len;
• len = scnprintf(tmpbuf, sizeof(tmpbuf), "%li\n", atomic_long_read(val));
• return simple_read_from_buffer(buf, count, ppos, tmpbuf, len);

+} +#endif

+#ifdef CONFIG_IMA_DIGEST_LIST static const struct file_operations ima_htable_value_ops = { .read = ima_show_htable_value, .llseek = generic_file_llseek, }; +#else +static ssize_t ima_show_htable_violations(struct file *filp,

• 			  char __user *buf,
  

• 			  size_t count, loff_t *ppos)
  

+{

• return ima_show_htable_value(buf, count, ppos, &ima_htable.violations);

+}

+static const struct file_operations ima_htable_violations_ops = {

• .read = ima_show_htable_violations,
• .llseek = generic_file_llseek,

+};

+static ssize_t ima_show_measurements_count(struct file *filp,

• 			   char __user *buf,
  

• 			   size_t count, loff_t *ppos)
  

+{

• return ima_show_htable_value(buf, count, ppos, &ima_htable.len);

+}

+static const struct file_operations ima_measurements_count_ops = {

• .read = ima_show_measurements_count,
• .llseek = generic_file_llseek,

+}; +#endif

/* returns pointer to hlist_node */ static void *ima_measurements_start(struct seq_file *m, loff_t *pos) @@ -275,6 +317,7 @@ static const struct file_operations ima_ascii_measurements_ops = { .release = seq_release, };

+#ifdef CONFIG_IMA_DIGEST_LIST static ssize_t ima_read_file(char *path, struct dentry *dentry) { void *data = NULL; @@ -320,7 +363,6 @@ static ssize_t ima_read_file(char *path, struct dentry *dentry) rc = ima_parse_add_rule(p); } else if (dentry == digest_list_data || dentry == digest_list_data_del) { -#ifdef CONFIG_IMA_DIGEST_LIST /* Only check size when adding digest lists */ if (dentry == digest_list_data && size > ima_digest_db_max_size - ima_digest_db_size) { @@ -328,7 +370,6 @@ static ssize_t ima_read_file(char *path, struct dentry *dentry) rc = -ENOMEM; break; } -#endif /* * Disable usage of digest lists if not measured * or appraised. @@ -343,12 +384,10 @@ static ssize_t ima_read_file(char *path, struct dentry *dentry)

if (rc < 0)
	break;

-#ifdef CONFIG_IMA_DIGEST_LIST else if (dentry == digest_list_data) pr_debug("digest imported, current DB size: %d\n", ima_digest_db_size); else if (dentry == digest_list_data_del) pr_debug("digest deleted, current DB size: %d\n", ima_digest_db_size); -#endif size -= rc; }

@@ -461,6 +500,104 @@ static enum ima_fs_flags ima_get_dentry_flag(struct dentry *dentry)

return flag; } +#else +static ssize_t ima_read_policy(char *path) +{

• void *data = NULL;
• char *datap;
• size_t size;
• int rc, pathlen = strlen(path);
• char *p;
• /* remove \n */
• datap = path;
• strsep(&datap, "\n");
• rc = kernel_read_file_from_path(path, 0, &data, INT_MAX, NULL,

• 			READING_POLICY);
  

• if (rc < 0) {

• pr_err("Unable to open file: %s (%d)", path, rc);
  

• return rc;
  

• }
• size = rc;
• rc = 0;
• datap = data;
• while (size > 0 && (p = strsep(&datap, "\n"))) {

• pr_debug("rule: %s\n", p);
  

• rc = ima_parse_add_rule(p);
  

• if (rc < 0)
  

• 	break;
  

• size -= rc;
  

• }
• vfree(data);
• if (rc < 0)

• return rc;
  

• else if (size)

• return -EINVAL;
  

• else

• return pathlen;
  

+}

+static ssize_t ima_write_policy(struct file *file, const char __user *buf,

• 		size_t datalen, loff_t *ppos)
  

+{

• char *data;
• ssize_t result;
• if (datalen >= PAGE_SIZE)

• datalen = PAGE_SIZE - 1;
  

• /* No partial writes. */
• result = -EINVAL;
• if (*ppos != 0)

• goto out;
  

• data = memdup_user_nul(buf, datalen);
• if (IS_ERR(data)) {

• result = PTR_ERR(data);
  

• goto out;
  

• }
• result = mutex_lock_interruptible(&ima_write_mutex);
• if (result < 0)

• goto out_free;
  

• if (data[0] == '/') {

• result = ima_read_policy(data);
  

• } else if (ima_appraise & IMA_APPRAISE_POLICY) {

• pr_err("signed policy file (specified as an absolute pathname) required\n");
  

• integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
  

• 		    "policy_update", "signed policy required",
  

• 		    1, 0);
  

• result = -EACCES;
  

• } else {

• result = ima_parse_add_rule(data);
  

• }
• mutex_unlock(&ima_write_mutex);

+out_free:

• kfree(data);

+out:

• if (result < 0)

• valid_policy = 0;
  

• return result;

+}

+static struct dentry *ima_dir; +static struct dentry *ima_symlink; +static struct dentry *binary_runtime_measurements; +static struct dentry *ascii_runtime_measurements; +static struct dentry *runtime_measurements_count; +static struct dentry *violations; +static struct dentry *ima_policy;

+enum ima_fs_flags {

• IMA_FS_BUSY,

+}; +#endif

static unsigned long ima_fs_flags;

@@ -473,6 +610,7 @@ static const struct seq_operations ima_policy_seqops = { }; #endif

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• ima_open_data_upload: sequentialize access to the data upload interface

*/ @@ -568,6 +706,79 @@ static const struct file_operations ima_data_upload_ops = { .release = ima_release_data_upload, .llseek = generic_file_llseek, }; +#else +/*

• • ima_open_policy: sequentialize access to the policy file
• */

+static int ima_open_policy(struct inode *inode, struct file *filp) +{

• if (!(filp->f_flags & O_WRONLY)) {

+#ifndef CONFIG_IMA_READ_POLICY

• return -EACCES;
  

+#else

• if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
  

• 	return -EACCES;
  

• if (!capable(CAP_SYS_ADMIN))
  

• 	return -EPERM;
  

• return seq_open(filp, &ima_policy_seqops);
  

+#endif

• }
• if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags))

• return -EBUSY;
  

• return 0;

+}

+/*

• • ima_release_policy - start using the new measure policy rules.
• • Initially, ima_measure points to the default policy rules, now
• • point to the new policy rules, and remove the securityfs policy file,
• • assuming a valid policy.
• */

+static int ima_release_policy(struct inode *inode, struct file *file) +{

• const char *cause = valid_policy ? "completed" : "failed";
• if ((file->f_flags & O_ACCMODE) == O_RDONLY)

• return seq_release(inode, file);
  

• if (valid_policy && ima_check_policy() < 0) {

• cause = "failed";
  

• valid_policy = 0;
  

• }
• pr_info("policy update %s\n", cause);
• integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,

• 	    "policy_update", cause, !valid_policy, 0);
  

• if (!valid_policy) {

• ima_delete_rules();
  

• valid_policy = 1;
  

• clear_bit(IMA_FS_BUSY, &ima_fs_flags);
  

• return 0;
  

• }
• ima_update_policy();

+#if !defined(CONFIG_IMA_WRITE_POLICY) && !defined(CONFIG_IMA_READ_POLICY)

• securityfs_remove(ima_policy);
• ima_policy = NULL;

+#elif defined(CONFIG_IMA_WRITE_POLICY)

• clear_bit(IMA_FS_BUSY, &ima_fs_flags);

+#elif defined(CONFIG_IMA_READ_POLICY)

• inode->i_mode &= ~S_IWUSR;

+#endif

• return 0;

+}

+static const struct file_operations ima_measure_policy_ops = {

• .open = ima_open_policy,
• .write = ima_write_policy,
• .read = seq_read,
• .release = ima_release_policy,
• .llseek = generic_file_llseek,

+};

+#endif

int __init ima_fs_init(void) { @@ -594,6 +805,7 @@ int __init ima_fs_init(void) if (IS_ERR(ascii_runtime_measurements)) goto out;

+#ifdef CONFIG_IMA_DIGEST_LIST runtime_measurements_count = securityfs_create_file("runtime_measurements_count", S_IRUSR | S_IRGRP, ima_dir, NULL, @@ -613,7 +825,6 @@ int __init ima_fs_init(void) if (IS_ERR(ima_policy)) goto out;

-#ifdef CONFIG_IMA_DIGEST_LIST digests_count = securityfs_create_file("digests_count", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_htable_value_ops); @@ -631,12 +842,34 @@ int __init ima_fs_init(void) &ima_data_upload_ops); if (IS_ERR(digest_list_data_del)) goto out; +#else

• runtime_measurements_count =

•    securityfs_create_file("runtime_measurements_count",
  

• 		   S_IRUSR | S_IRGRP, ima_dir, NULL,
  

• 		   &ima_measurements_count_ops);
  

• if (IS_ERR(runtime_measurements_count))

• goto out;
  

• violations =

•    securityfs_create_file("violations", S_IRUSR | S_IRGRP,
  

• 		   ima_dir, NULL, &ima_htable_violations_ops);
  

• if (IS_ERR(violations))

• goto out;
  

• ima_policy = securityfs_create_file("policy", POLICY_FILE_FLAGS,

• 			    ima_dir, NULL,
  

• 			    &ima_measure_policy_ops);
  

• if (IS_ERR(ima_policy))

• goto out;
  

#endif return 0; out: +#ifdef CONFIG_IMA_DIGEST_LIST securityfs_remove(digest_list_data_del); securityfs_remove(digest_list_data); securityfs_remove(digests_count); +#endif securityfs_remove(ima_policy); securityfs_remove(violations); securityfs_remove(runtime_measurements_count); diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 913d6b879b0b..085e8a049f51 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -84,9 +84,15 @@ static int __init ima_add_boot_aggregate(void) goto err_out; }

+#ifdef CONFIG_IMA_DIGEST_LIST result = ima_store_template(entry, violation, NULL, boot_aggregate_name, CONFIG_IMA_MEASURE_PCR_IDX, NULL); +#else

• result = ima_store_template(entry, violation, NULL,

• 		    boot_aggregate_name,
  

• 		    CONFIG_IMA_MEASURE_PCR_IDX);
  

+#endif if (result < 0) { ima_free_template_entry(entry); audit_cause = "store_entry"; @@ -107,8 +113,10 @@ void __init ima_load_x509(void) ima_policy_flag &= ~unset_flags; integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH);

+#ifdef CONFIG_IMA_DIGEST_LIST /* load also EVM key to avoid appraisal */ evm_load_x509(); +#endif

ima_policy_flag |= unset_flags; } diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 999d5904cce0..c4121330a647 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -28,7 +28,9 @@ #include <linux/fs.h>

#include "ima.h" +#ifdef CONFIG_IMA_DIGEST_LIST #include "ima_digest_list.h" +#endif

#ifdef CONFIG_IMA_APPRAISE int ima_appraise = IMA_APPRAISE_ENFORCE; @@ -38,12 +40,14 @@ int ima_appraise;

int ima_hash_algo = HASH_ALGO_SHA1;

+#ifdef CONFIG_IMA_DIGEST_LIST /* Actions (measure/appraisal) for which digest lists can be used */ int ima_digest_list_actions; /* PCR used for digest list measurements */ int ima_digest_list_pcr = -1; /* Flag to include standard measurement if digest list PCR is specified */ bool ima_plus_standard_pcr; +#endif

static int hash_setup_done;

@@ -156,6 +160,7 @@ static void ima_rdwr_violation_check(struct file *file, "invalid_pcr", "open_writers"); }

+#ifdef CONFIG_IMA_DIGEST_LIST static enum hash_algo ima_get_hash_algo(struct evm_ima_xattr_data *xattr_value, int xattr_len) { @@ -209,6 +214,7 @@ static int ima_read_xattr(struct dentry *dentry, ret = 0; return ret; } +#endif

static void ima_check_last_writer(struct integrity_iint_cache *iint, struct inode *inode, struct file *file) @@ -268,7 +274,9 @@ static int process_measurement(struct file *file, const struct cred *cred, const char *pathname = NULL; int rc = 0, action, must_appraise = 0; int pcr = CONFIG_IMA_MEASURE_PCR_IDX; +#ifdef CONFIG_IMA_DIGEST_LIST struct ima_digest *found_digest; +#endif struct evm_ima_xattr_data *xattr_value = NULL; struct modsig *modsig = NULL; int xattr_len = 0; @@ -398,28 +406,42 @@ static int process_measurement(struct file *file, const struct cred *cred, if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */ pathname = ima_d_path(&file->f_path, &pathbuf, filename);

+#ifdef CONFIG_IMA_DIGEST_LIST if (!pathname || strlen(pathname) > IMA_EVENT_NAME_LEN_MAX) pathname = file->f_path.dentry->d_name.name;

found_digest = ima_lookup_digest(iint->ima_hash->digest, hash_algo, COMPACT_FILE); +#endif

if (action & IMA_MEASURE) +#ifdef CONFIG_IMA_DIGEST_LIST ima_store_measurement(iint, file, pathname, xattr_value, xattr_len, modsig, pcr, template_desc, ima_digest_allow(found_digest, IMA_MEASURE)); +#else

• ima_store_measurement(iint, file, pathname,
  

• 		      xattr_value, xattr_len, modsig, pcr,
  

• 		      template_desc);
  

+#endif

if (rc == 0 && (action & IMA_APPRAISE_SUBMASK)) { rc = ima_check_blacklist(iint, modsig, pcr); if (rc != -EPERM) { inode_lock(inode); +#ifdef CONFIG_IMA_DIGEST_LIST rc = ima_appraise_measurement(func, iint, file, pathname, xattr_value, xattr_len, modsig, ima_digest_allow(found_digest, IMA_APPRAISE)); +#else

• 	rc = ima_appraise_measurement(func, iint, file,
  

• 			      pathname, xattr_value,
  

• 			      xattr_len, modsig);
  

+#endif inode_unlock(inode); } if (!rc) @@ -568,15 +590,21 @@ int ima_bprm_check(struct linux_binprm *bprm) int ima_file_check(struct file *file, int mask) { u32 secid;

• int rc;

  security_task_getsecid(current, &secid);

+#ifdef CONFIG_IMA_DIGEST_LIST

• int rc; rc = process_measurement(file, current_cred(), secid, NULL, 0, mask & (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND), FILE_CHECK); if (ima_current_is_parser() && !rc) ima_check_measured_appraised(file); return rc;

+#else

• return process_measurement(file, current_cred(), secid, NULL, 0,

• 		 mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
  

• 			 MAY_APPEND), FILE_CHECK);
  

+#endif } EXPORT_SYMBOL_GPL(ima_file_check);

@@ -739,7 +767,9 @@ const int read_idmap[READING_MAX_ID] = { [READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK, [READING_KEXEC_INITRAMFS] = KEXEC_INITRAMFS_CHECK, [READING_POLICY] = POLICY_CHECK, +#ifdef CONFIG_IMA_DIGEST_LIST [READING_DIGEST_LIST] = DIGEST_LIST_CHECK +#endif };

/** @@ -941,7 +971,11 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, goto out; }

+#ifdef CONFIG_IMA_DIGEST_LIST ret = ima_store_template(entry, violation, NULL, buf, pcr, NULL); +#else

• ret = ima_store_template(entry, violation, NULL, buf, pcr);

+#endif if (ret < 0) { audit_cause = "store_entry"; ima_free_template_entry(entry); diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 274f4c7c99f4..3e14b55ecf0f 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -21,7 +21,9 @@ #include <linux/ima.h>

#include "ima.h" +#ifdef CONFIG_IMA_DIGEST_LIST #include "ima_digest_list.h" +#endif

/* flags definitions */ #define IMA_FUNC 0x0001 @@ -35,7 +37,9 @@ #define IMA_PCR 0x0100 #define IMA_FSNAME 0x0200 #define IMA_KEYRINGS 0x0400 +#ifdef CONFIG_IMA_DIGEST_LIST #define IMA_PARSER 0x0800 +#endif

#define UNKNOWN 0 #define MEASURE 0x0001 /* same as IMA_MEASURE */ @@ -58,7 +62,11 @@ enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE, LSM_SUBJ_USER, LSM_SUBJ_ROLE, LSM_SUBJ_TYPE };

+#ifdef CONFIG_IMA_DIGEST_LIST enum policy_types { ORIGINAL_TCB = 1, DEFAULT_TCB, EXEC_TCB }; +#else +enum policy_types { ORIGINAL_TCB = 1, DEFAULT_TCB }; +#endif

enum policy_rule_list { IMA_DEFAULT_POLICY = 1, IMA_CUSTOM_POLICY };

@@ -145,11 +153,13 @@ static struct ima_rule_entry default_measurement_rules[] __ro_after_init = { {.action = MEASURE, .func = MODULE_CHECK, .flags = IMA_FUNC}, {.action = MEASURE, .func = FIRMWARE_CHECK, .flags = IMA_FUNC}, {.action = MEASURE, .func = POLICY_CHECK, .flags = IMA_FUNC}, +#ifdef CONFIG_IMA_DIGEST_LIST {.action = MEASURE, .func = DIGEST_LIST_CHECK, .flags = IMA_FUNC}, };

static struct ima_rule_entry ima_parser_measure_rule __ro_after_init = { .action = MEASURE, .flags = IMA_PARSER +#endif };

static struct ima_rule_entry default_appraise_rules[] __ro_after_init = { @@ -181,12 +191,14 @@ static struct ima_rule_entry default_appraise_rules[] __ro_after_init = { #endif };

+#ifdef CONFIG_IMA_DIGEST_LIST static struct ima_rule_entry appraise_exec_rules[] __ro_after_init = { {.action = APPRAISE, .func = BPRM_CHECK, .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, {.action = APPRAISE, .func = MMAP_CHECK, .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, }; +#endif

static struct ima_rule_entry build_appraise_rules[] __ro_after_init = { #ifdef CONFIG_IMA_APPRAISE_REQUIRE_MODULE_SIGS @@ -216,6 +228,7 @@ static struct ima_rule_entry secure_boot_rules[] __ro_after_init = { .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, {.action = APPRAISE, .func = POLICY_CHECK, .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, +#ifdef CONFIG_IMA_DIGEST_LIST {.action = APPRAISE, .func = DIGEST_LIST_CHECK, .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED}, }; @@ -223,6 +236,7 @@ static struct ima_rule_entry secure_boot_rules[] __ro_after_init = { static struct ima_rule_entry ima_parser_appraise_rule __ro_after_init = { .action = APPRAISE, .flags = IMA_PARSER | IMA_DIGSIG_REQUIRED +#endif };

/* An array of architecture specific rules */ @@ -246,8 +260,10 @@ static int __init default_measure_policy_setup(char *str) __setup("ima_tcb", default_measure_policy_setup);

static bool ima_use_appraise_tcb __initdata; +#ifdef CONFIG_IMA_DIGEST_LIST static bool ima_use_appraise_exec_tcb __initdata; static bool ima_use_appraise_exec_immutable __initdata; +#endif static bool ima_use_secure_boot __initdata; static bool ima_fail_unverifiable_sigs __ro_after_init; static int __init policy_setup(char *str) @@ -259,14 +275,18 @@ static int __init policy_setup(char *str) continue; if ((strcmp(p, "tcb") == 0) && !ima_policy) ima_policy = DEFAULT_TCB; +#ifdef CONFIG_IMA_DIGEST_LIST else if ((strcmp(p, "exec_tcb") == 0) && !ima_policy) ima_policy = EXEC_TCB; +#endif else if (strcmp(p, "appraise_tcb") == 0) ima_use_appraise_tcb = true; +#ifdef CONFIG_IMA_DIGEST_LIST else if (strcmp(p, "appraise_exec_tcb") == 0) ima_use_appraise_exec_tcb = true; else if (strcmp(p, "appraise_exec_immutable") == 0) ima_use_appraise_exec_immutable = true; +#endif else if (strcmp(p, "secure_boot") == 0) ima_use_secure_boot = true; else if (strcmp(p, "fail_securely") == 0) @@ -569,9 +589,11 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, if ((rule->flags & IMA_FOWNER) && !rule->fowner_op(inode->i_uid, rule->fowner)) return false; +#ifdef CONFIG_IMA_DIGEST_LIST if ((rule->flags & IMA_PARSER) && !ima_current_is_parser()) return false; +#endif for (i = 0; i < MAX_LSM_RULES; i++) { int rc = 0; u32 osid; @@ -752,19 +774,27 @@ static int ima_appraise_flag(enum ima_hooks func) return IMA_APPRAISE_POLICY; else if (func == KEXEC_KERNEL_CHECK) return IMA_APPRAISE_KEXEC; +#ifdef CONFIG_IMA_DIGEST_LIST else if (func == DIGEST_LIST_CHECK) return IMA_APPRAISE_DIGEST_LIST; +#endif return 0; }

+#ifdef CONFIG_IMA_DIGEST_LIST static void __init add_rules(struct ima_rule_entry *entries, int count, enum policy_rule_list policy_rule) +#else +static void add_rules(struct ima_rule_entry *entries, int count,

• 	     enum policy_rule_list policy_rule)
  

+#endif { int i = 0;

for (i = 0; i < count; i++) { struct ima_rule_entry *entry;

+#ifdef CONFIG_IMA_DIGEST_LIST if (ima_policy == EXEC_TCB) { if (entries == dont_measure_rules) if ((entries[i].flags & IMA_FSMAGIC) && @@ -792,6 +822,7 @@ static void __init add_rules(struct ima_rule_entry *entries, int count, (entries[i].flags & IMA_FUNC) && entries[i].func == BPRM_CHECK) entries[i].flags |= IMA_META_IMMUTABLE_REQUIRED; +#endif

if (policy_rule & IMA_DEFAULT_POLICY)
	list_add_tail(&entries[i].list, &ima_default_rules);

@@ -879,8 +910,10 @@ void __init ima_init_policy(void) ARRAY_SIZE(original_measurement_rules), IMA_DEFAULT_POLICY); break; +#ifdef CONFIG_IMA_DIGEST_LIST case EXEC_TCB: fallthrough; +#endif case DEFAULT_TCB: add_rules(default_measurement_rules, ARRAY_SIZE(default_measurement_rules), @@ -889,8 +922,10 @@ void __init ima_init_policy(void) break; }

+#ifdef CONFIG_IMA_DIGEST_LIST if (ima_policy) add_rules(&ima_parser_measure_rule, 1, IMA_DEFAULT_POLICY); +#endif

/* * Based on runtime secure boot flags, insert arch specific measurement @@ -909,7 +944,11 @@ void __init ima_init_policy(void) * Insert the builtin "secure_boot" policy rules requiring file * signatures, prior to other appraise rules. */ +#ifdef CONFIG_IMA_DIGEST_LIST if (ima_use_secure_boot || ima_use_appraise_exec_tcb) +#else

• if (ima_use_secure_boot)

+#endif add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules), IMA_DEFAULT_POLICY);

@@ -929,11 +968,16 @@ void __init ima_init_policy(void) IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY); }

+#ifdef CONFIG_IMA_DIGEST_LIST if (ima_use_appraise_tcb || ima_use_appraise_exec_tcb) +#else

• if (ima_use_appraise_tcb)

+#endif add_rules(default_appraise_rules, ARRAY_SIZE(default_appraise_rules), IMA_DEFAULT_POLICY);

+#ifdef CONFIG_IMA_DIGEST_LIST if (ima_use_appraise_exec_tcb) add_rules(appraise_exec_rules, ARRAY_SIZE(appraise_exec_rules), @@ -942,6 +986,7 @@ void __init ima_init_policy(void) if (ima_use_secure_boot || ima_use_appraise_tcb || ima_use_appraise_exec_tcb) add_rules(&ima_parser_appraise_rule, 1, IMA_DEFAULT_POLICY); +#endif

ima_update_policy_flag(); } @@ -1002,7 +1047,11 @@ enum { Opt_uid_lt, Opt_euid_lt, Opt_fowner_lt, Opt_appraise_type, Opt_appraise_flag, Opt_permit_directio, Opt_pcr, Opt_template, Opt_keyrings, +#ifdef CONFIG_IMA_DIGEST_LIST Opt_parser, Opt_err +#else

• Opt_err

+#endif };

static const match_table_t policy_tokens = { @@ -1039,7 +1088,9 @@ static const match_table_t policy_tokens = { {Opt_pcr, "pcr=%s"}, {Opt_template, "template=%s"}, {Opt_keyrings, "keyrings=%s"}, +#ifdef CONFIG_IMA_DIGEST_LIST {Opt_parser, "parser"}, +#endif {Opt_err, NULL} };

@@ -1134,9 +1185,14 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) if (entry->action != MEASURE && entry->flags & IMA_PCR) return false;

+#ifdef CONFIG_IMA_DIGEST_LIST if (entry->action != APPRAISE && entry->flags & (IMA_DIGSIG_REQUIRED | IMA_MODSIG_ALLOWED | IMA_CHECK_BLACKLIST | IMA_META_IMMUTABLE_REQUIRED)) +#else

• if (entry->action != APPRAISE &&

•    entry->flags & (IMA_DIGSIG_REQUIRED | IMA_MODSIG_ALLOWED | IMA_CHECK_BLACKLIST))
  

+#endif return false;

/* @@ -1162,13 +1218,19 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) case POST_SETATTR: case FIRMWARE_CHECK: case POLICY_CHECK: +#ifdef CONFIG_IMA_DIGEST_LIST case DIGEST_LIST_CHECK: +#endif if (entry->flags & ~(IMA_FUNC | IMA_MASK | IMA_FSMAGIC | IMA_UID | IMA_FOWNER | IMA_FSUUID | IMA_INMASK | IMA_EUID | IMA_PCR | IMA_FSNAME | IMA_DIGSIG_REQUIRED | +#ifdef CONFIG_IMA_DIGEST_LIST IMA_PERMIT_DIRECTIO | IMA_META_IMMUTABLE_REQUIRED | IMA_PARSER)) +#else

• 			 IMA_PERMIT_DIRECTIO))
  

+#endif return false;

break;

@@ -1180,8 +1242,12 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) IMA_INMASK | IMA_EUID | IMA_PCR | IMA_FSNAME | IMA_DIGSIG_REQUIRED | IMA_PERMIT_DIRECTIO | IMA_MODSIG_ALLOWED | +#ifdef CONFIG_IMA_DIGEST_LIST IMA_CHECK_BLACKLIST | IMA_META_IMMUTABLE_REQUIRED)) +#else

• 		     IMA_CHECK_BLACKLIST))
  

+#endif return false;

break;

@@ -1338,8 +1404,10 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) else if (IS_ENABLED(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) && strcmp(args[0].from, "KEY_CHECK") == 0) entry->func = KEY_CHECK; +#ifdef CONFIG_IMA_DIGEST_LIST else if (strcmp(args[0].from, "DIGEST_LIST_CHECK") == 0) entry->func = DIGEST_LIST_CHECK; +#endif else result = -EINVAL; if (!result) @@ -1526,8 +1594,10 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) strcmp(args[0].from, "imasig|modsig") == 0) entry->flags |= IMA_DIGSIG_REQUIRED | IMA_MODSIG_ALLOWED; +#ifdef CONFIG_IMA_DIGEST_LIST else if (strcmp(args[0].from, "meta_immutable") == 0) entry->flags |= IMA_META_IMMUTABLE_REQUIRED; +#endif else result = -EINVAL; break; @@ -1546,8 +1616,12 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) ima_log_string(ab, "pcr", args[0].from);

	result = kstrtoint(args[0].from, 10, &entry->pcr);

+#ifdef CONFIG_IMA_DIGEST_LIST if (result || INVALID_PCR(entry->pcr) || entry->pcr == ima_digest_list_pcr) +#else

• 	if (result || INVALID_PCR(entry->pcr))
  

+#endif result = -EINVAL; else entry->flags |= IMA_PCR; @@ -1574,10 +1648,12 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) &(template_desc->fields), &(template_desc->num_fields)); entry->template = template_desc; +#ifdef CONFIG_IMA_DIGEST_LIST break; case Opt_parser: audit_log_format(ab, "parser "); entry->flags |= IMA_PARSER; +#endif break; case Opt_err: ima_log_string(ab, "UNKNOWN", p); @@ -1849,8 +1925,10 @@ int ima_policy_show(struct seq_file *m, void *v) seq_puts(m, " "); }

+#ifdef CONFIG_IMA_DIGEST_LIST if (entry->flags & IMA_PARSER) seq_puts(m, "parser "); +#endif

for (i = 0; i < MAX_LSM_RULES; i++) { if (entry->lsm[i].rule) { @@ -1893,8 +1971,10 @@ int ima_policy_show(struct seq_file *m, void *v) } if (entry->flags & IMA_CHECK_BLACKLIST) seq_puts(m, "appraise_flag=check_blacklist "); +#ifdef CONFIG_IMA_DIGEST_LIST if (entry->flags & IMA_META_IMMUTABLE_REQUIRED) seq_puts(m, "appraise_type=meta_immutable "); +#endif if (entry->flags & IMA_PERMIT_DIRECTIO) seq_puts(m, "permit_directio "); rcu_read_unlock(); diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c index 6f126dbd2b39..a40098347f81 100644 --- a/security/integrity/ima/ima_template.c +++ b/security/integrity/ima/ima_template.c @@ -45,8 +45,10 @@ static const struct ima_template_field supported_fields[] = { {.field_id = "d-modsig", .field_init = ima_eventdigest_modsig_init, .field_show = ima_show_template_digest_ng}, {.field_id = "modsig", .field_init = ima_eventmodsig_init, +#ifdef CONFIG_IMA_DIGEST_LIST .field_show = ima_show_template_sig}, {.field_id = "evmsig", .field_init = ima_eventevmsig_init, +#endif .field_show = ima_show_template_sig}, };

diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c index 90040fac150b..7308ee587314 100644 --- a/security/integrity/ima/ima_template_lib.c +++ b/security/integrity/ima/ima_template_lib.c @@ -10,7 +10,9 @@ */

#include "ima_template_lib.h" +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/xattr.h> +#endif

static bool ima_template_hash_algo_allowed(u8 algo) { @@ -439,7 +441,11 @@ int ima_eventsig_init(struct ima_event_data *event_data, struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;

if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG)) +#ifdef CONFIG_IMA_DIGEST_LIST return ima_eventevmsig_init(event_data, field_data); +#else

• return 0;
  

+#endif

return ima_write_template_field_data(xattr_value, event_data->xattr_len, DATA_FMT_HEX, field_data); @@ -486,6 +492,7 @@ int ima_eventmodsig_init(struct ima_event_data *event_data, field_data); }

+#ifdef CONFIG_IMA_DIGEST_LIST /*

• ima_eventevmsig_init - include the EVM portable signature as part of the
• template data

@@ -514,3 +521,4 @@ int ima_eventevmsig_init(struct ima_event_data *event_data, kfree(xattr_data); return rc; } +#endif diff --git a/security/integrity/ima/ima_template_lib.h b/security/integrity/ima/ima_template_lib.h index f4b2a2056d1d..5313a8a22e45 100644 --- a/security/integrity/ima/ima_template_lib.h +++ b/security/integrity/ima/ima_template_lib.h @@ -46,6 +46,8 @@ int ima_eventbuf_init(struct ima_event_data *event_data, struct ima_field_data *field_data); int ima_eventmodsig_init(struct ima_event_data *event_data, struct ima_field_data *field_data); +#ifdef CONFIG_IMA_DIGEST_LIST int ima_eventevmsig_init(struct ima_event_data *event_data, struct ima_field_data *field_data); +#endif #endif /* __LINUX_IMA_TEMPLATE_LIB_H */ diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 77e6819e8db8..d9cf29e286a9 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -14,10 +14,13 @@

#include <linux/types.h> #include <linux/integrity.h> +#include <crypto/sha1.h> #include <crypto/sha2.h> #include <linux/key.h> #include <linux/audit.h> +#ifdef CONFIG_IMA_DIGEST_LIST #include <linux/hash_info.h> +#endif

/* iint action cache flags */ #define IMA_MEASURE 0x00000001 @@ -40,7 +43,9 @@ #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 #define IMA_MODSIG_ALLOWED 0x20000000 #define IMA_CHECK_BLACKLIST 0x40000000 +#ifdef CONFIG_IMA_DIGEST_LIST #define IMA_META_IMMUTABLE_REQUIRED 0x80000000 +#endif

#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ IMA_HASH | IMA_APPRAISE_SUBMASK) @@ -72,7 +77,9 @@ #define IMA_CHANGE_ATTR 2 #define IMA_DIGSIG 3 #define IMA_MUST_MEASURE 4 +#ifdef CONFIG_IMA_DIGEST_LIST #define IMA_DIGEST_LIST 5 +#endif

enum evm_ima_xattr_type { IMA_XATTR_DIGEST = 0x01, @@ -80,7 +87,9 @@ enum evm_ima_xattr_type { EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, EVM_XATTR_PORTABLE_DIGSIG, +#ifdef CONFIG_IMA_DIGEST_LIST EVM_IMA_XATTR_DIGEST_LIST, +#endif IMA_XATTR_LAST };

@@ -92,7 +101,11 @@ struct evm_ima_xattr_data { /* Only used in the EVM HMAC code. */ struct evm_xattr { struct evm_ima_xattr_data data; +#ifdef CONFIG_IMA_DIGEST_LIST u8 digest[SHA512_DIGEST_SIZE]; +#else

• u8 digest[SHA1_DIGEST_SIZE];

+#endif } __packed;

#define IMA_MAX_DIGEST_SIZE 64 @@ -144,6 +157,7 @@ struct integrity_iint_cache { struct ima_digest_data *ima_hash; };

+#ifdef CONFIG_IMA_DIGEST_LIST enum compact_types { COMPACT_KEY, COMPACT_PARSER, COMPACT_FILE, COMPACT_METADATA, COMPACT__LAST }; enum compact_modifiers { COMPACT_MOD_IMMUTABLE, COMPACT_MOD__LAST }; @@ -162,7 +176,6 @@ static inline bool ima_digest_is_immutable(struct ima_digest *digest) return (digest->modifiers & (1 << COMPACT_MOD_IMMUTABLE)); }

-#ifdef CONFIG_IMA_DIGEST_LIST struct ima_digest *ima_lookup_digest(u8 *digest, enum hash_algo algo, enum compact_types type); struct ima_digest *ima_digest_allow(struct ima_digest *digest, int action); diff --git a/security/security.c b/security/security.c index 5678d4e334fb..11c859a9b8ed 100644 --- a/security/security.c +++ b/security/security.c @@ -1362,7 +1362,9 @@ void security_inode_post_setxattr(struct dentry *dentry, const char *name, if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) return; call_void_hook(inode_post_setxattr, dentry, name, value, size, flags); +#ifdef CONFIG_IMA_DIGEST_LIST ima_inode_post_setxattr(dentry, name, value, size); +#endif evm_inode_post_setxattr(dentry, name, value, size); }

-- 2.33.0

---

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