diff options
Diffstat (limited to 'security/integrity')
26 files changed, 721 insertions, 195 deletions
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 71f0177e8716..599429f99f99 100644 --- a/security/integrity/Kconfig +++ b/security/integrity/Kconfig @@ -62,6 +62,19 @@ config INTEGRITY_PLATFORM_KEYRING provided by the platform for verifying the kexec'ed kerned image and, possibly, the initramfs signature. +config INTEGRITY_MACHINE_KEYRING + bool "Provide a keyring to which Machine Owner Keys may be added" + depends on SECONDARY_TRUSTED_KEYRING + depends on INTEGRITY_ASYMMETRIC_KEYS + depends on SYSTEM_BLACKLIST_KEYRING + depends on LOAD_UEFI_KEYS + depends on !IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY + help + If set, provide a keyring to which Machine Owner Keys (MOK) may + be added. This keyring shall contain just MOK keys. Unlike keys + in the platform keyring, keys contained in the .machine keyring will + be trusted within the kernel. + config LOAD_UEFI_KEYS depends on INTEGRITY_PLATFORM_KEYRING depends on EFI diff --git a/security/integrity/Makefile b/security/integrity/Makefile index 7ee39d66cf16..d0ffe37dc1d6 100644 --- a/security/integrity/Makefile +++ b/security/integrity/Makefile @@ -10,6 +10,7 @@ integrity-$(CONFIG_INTEGRITY_AUDIT) += integrity_audit.o integrity-$(CONFIG_INTEGRITY_SIGNATURE) += digsig.o integrity-$(CONFIG_INTEGRITY_ASYMMETRIC_KEYS) += digsig_asymmetric.o integrity-$(CONFIG_INTEGRITY_PLATFORM_KEYRING) += platform_certs/platform_keyring.o +integrity-$(CONFIG_INTEGRITY_MACHINE_KEYRING) += platform_certs/machine_keyring.o integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \ platform_certs/load_uefi.o \ platform_certs/keyring_handler.o diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 3b06a01bd0fd..8a82a6c7f48a 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -30,6 +30,7 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = { ".ima", #endif ".platform", + ".machine", }; #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY @@ -74,7 +75,8 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, /* v1 API expect signature without xattr type */ return digsig_verify(keyring, sig + 1, siglen - 1, digest, digestlen); - case 2: + case 2: /* regular file data hash based signature */ + case 3: /* struct ima_file_id data based signature */ return asymmetric_verify(keyring, sig, siglen, digest, digestlen); } @@ -111,6 +113,8 @@ static int __init __integrity_init_keyring(const unsigned int id, } else { if (id == INTEGRITY_KEYRING_PLATFORM) set_platform_trusted_keys(keyring[id]); + if (id == INTEGRITY_KEYRING_MACHINE && trust_moklist()) + set_machine_trusted_keys(keyring[id]); if (id == INTEGRITY_KEYRING_IMA) load_module_cert(keyring[id]); } @@ -126,7 +130,8 @@ int __init integrity_init_keyring(const unsigned int id) perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH; - if (id == INTEGRITY_KEYRING_PLATFORM) { + if (id == INTEGRITY_KEYRING_PLATFORM || + id == INTEGRITY_KEYRING_MACHINE) { restriction = NULL; goto out; } @@ -139,7 +144,14 @@ int __init integrity_init_keyring(const unsigned int id) return -ENOMEM; restriction->check = restrict_link_to_ima; - perm |= KEY_USR_WRITE; + + /* + * MOK keys can only be added through a read-only runtime services + * UEFI variable during boot. No additional keys shall be allowed to + * load into the machine keyring following init from userspace. + */ + if (id != INTEGRITY_KEYRING_MACHINE) + perm |= KEY_USR_WRITE; out: return __integrity_init_keyring(id, perm, restriction); diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c index 23240d793b07..895f4b9ce8c6 100644 --- a/security/integrity/digsig_asymmetric.c +++ b/security/integrity/digsig_asymmetric.c @@ -109,22 +109,25 @@ int asymmetric_verify(struct key *keyring, const char *sig, pk = asymmetric_key_public_key(key); pks.pkey_algo = pk->pkey_algo; - if (!strcmp(pk->pkey_algo, "rsa")) + if (!strcmp(pk->pkey_algo, "rsa")) { pks.encoding = "pkcs1"; - else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) + } else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) { /* edcsa-nist-p192 etc. */ pks.encoding = "x962"; - else if (!strcmp(pk->pkey_algo, "ecrdsa") || - !strcmp(pk->pkey_algo, "sm2")) + } else if (!strcmp(pk->pkey_algo, "ecrdsa") || + !strcmp(pk->pkey_algo, "sm2")) { pks.encoding = "raw"; - else - return -ENOPKG; + } else { + ret = -ENOPKG; + goto out; + } pks.digest = (u8 *)data; pks.digest_size = datalen; pks.s = hdr->sig; pks.s_size = siglen; ret = verify_signature(key, &pks); +out: key_put(key); pr_debug("%s() = %d\n", __func__, ret); return ret; diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h index 0d44f41d16f8..f8b8c5004fc7 100644 --- a/security/integrity/evm/evm.h +++ b/security/integrity/evm/evm.h @@ -38,9 +38,6 @@ extern int evm_initialized; extern int evm_hmac_attrs; -extern struct crypto_shash *hmac_tfm; -extern struct crypto_shash *hash_tfm; - /* List of EVM protected security xattrs */ extern struct list_head evm_config_xattrnames; diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c index 0450d79afdc8..708de9656bbd 100644 --- a/security/integrity/evm/evm_crypto.c +++ b/security/integrity/evm/evm_crypto.c @@ -26,7 +26,7 @@ static unsigned char evmkey[MAX_KEY_SIZE]; static const int evmkey_len = MAX_KEY_SIZE; -struct crypto_shash *hmac_tfm; +static struct crypto_shash *hmac_tfm; static struct crypto_shash *evm_tfm[HASH_ALGO__LAST]; static DEFINE_MUTEX(mutex); @@ -75,7 +75,7 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo) { long rc; const char *algo; - struct crypto_shash **tfm, *tmp_tfm = NULL; + struct crypto_shash **tfm, *tmp_tfm; struct shash_desc *desc; if (type == EVM_XATTR_HMAC) { @@ -120,16 +120,13 @@ unlock: alloc: desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(*tfm), GFP_KERNEL); - if (!desc) { - crypto_free_shash(tmp_tfm); + if (!desc) return ERR_PTR(-ENOMEM); - } desc->tfm = *tfm; rc = crypto_shash_init(desc); if (rc) { - crypto_free_shash(tmp_tfm); kfree(desc); return ERR_PTR(rc); } diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c index 08f907382c61..23d484e05e6f 100644 --- a/security/integrity/evm/evm_main.c +++ b/security/integrity/evm/evm_main.c @@ -36,42 +36,36 @@ static const char * const integrity_status_msg[] = { int evm_hmac_attrs; static struct xattr_list evm_config_default_xattrnames[] = { - {.name = XATTR_NAME_SELINUX, -#ifdef CONFIG_SECURITY_SELINUX - .enabled = true -#endif + { + .name = XATTR_NAME_SELINUX, + .enabled = IS_ENABLED(CONFIG_SECURITY_SELINUX) }, - {.name = XATTR_NAME_SMACK, -#ifdef CONFIG_SECURITY_SMACK - .enabled = true -#endif + { + .name = XATTR_NAME_SMACK, + .enabled = IS_ENABLED(CONFIG_SECURITY_SMACK) }, - {.name = XATTR_NAME_SMACKEXEC, -#ifdef CONFIG_EVM_EXTRA_SMACK_XATTRS - .enabled = true -#endif + { + .name = XATTR_NAME_SMACKEXEC, + .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS) }, - {.name = XATTR_NAME_SMACKTRANSMUTE, -#ifdef CONFIG_EVM_EXTRA_SMACK_XATTRS - .enabled = true -#endif + { + .name = XATTR_NAME_SMACKTRANSMUTE, + .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS) }, - {.name = XATTR_NAME_SMACKMMAP, -#ifdef CONFIG_EVM_EXTRA_SMACK_XATTRS - .enabled = true -#endif + { + .name = XATTR_NAME_SMACKMMAP, + .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS) }, - {.name = XATTR_NAME_APPARMOR, -#ifdef CONFIG_SECURITY_APPARMOR - .enabled = true -#endif + { + .name = XATTR_NAME_APPARMOR, + .enabled = IS_ENABLED(CONFIG_SECURITY_APPARMOR) }, - {.name = XATTR_NAME_IMA, -#ifdef CONFIG_IMA_APPRAISE - .enabled = true -#endif + { + .name = XATTR_NAME_IMA, + .enabled = IS_ENABLED(CONFIG_IMA_APPRAISE) }, - {.name = XATTR_NAME_CAPS, + { + .name = XATTR_NAME_CAPS, .enabled = true }, }; @@ -86,7 +80,7 @@ static int __init evm_set_fixmode(char *str) else pr_err("invalid \"%s\" mode", str); - return 0; + return 1; } __setup("evm=", evm_set_fixmode); @@ -436,7 +430,7 @@ static enum integrity_status evm_verify_current_integrity(struct dentry *dentry) struct inode *inode = d_backing_inode(dentry); if (!evm_key_loaded() || !S_ISREG(inode->i_mode) || evm_fixmode) - return 0; + return INTEGRITY_PASS; return evm_verify_hmac(dentry, NULL, NULL, 0, NULL); } @@ -463,10 +457,21 @@ static int evm_xattr_acl_change(struct user_namespace *mnt_userns, int rc; /* - * user_ns is not relevant here, ACL_USER/ACL_GROUP don't have impact - * on the inode mode (see posix_acl_equiv_mode()). + * An earlier comment here mentioned that the idmappings for + * ACL_{GROUP,USER} don't matter since EVM is only interested in the + * mode stored as part of POSIX ACLs. Nonetheless, if it must translate + * from the uapi POSIX ACL representation to the VFS internal POSIX ACL + * representation it should do so correctly. There's no guarantee that + * we won't change POSIX ACLs in a way that ACL_{GROUP,USER} matters + * for the mode at some point and it's difficult to keep track of all + * the LSM and integrity modules and what they do to POSIX ACLs. + * + * Frankly, EVM shouldn't try to interpret the uapi struct for POSIX + * ACLs it received. It requires knowledge that only the VFS is + * guaranteed to have. */ - acl = posix_acl_from_xattr(&init_user_ns, xattr_value, xattr_value_len); + acl = vfs_set_acl_prepare(mnt_userns, i_user_ns(inode), + xattr_value, xattr_value_len); if (IS_ERR_OR_NULL(acl)) return 1; @@ -755,13 +760,14 @@ void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name) evm_update_evmxattr(dentry, xattr_name, NULL, 0); } -static int evm_attr_change(struct dentry *dentry, struct iattr *attr) +static int evm_attr_change(struct user_namespace *mnt_userns, + struct dentry *dentry, struct iattr *attr) { struct inode *inode = d_backing_inode(dentry); unsigned int ia_valid = attr->ia_valid; - if ((!(ia_valid & ATTR_UID) || uid_eq(attr->ia_uid, inode->i_uid)) && - (!(ia_valid & ATTR_GID) || gid_eq(attr->ia_gid, inode->i_gid)) && + if (!i_uid_needs_update(mnt_userns, attr, inode) && + !i_gid_needs_update(mnt_userns, attr, inode) && (!(ia_valid & ATTR_MODE) || attr->ia_mode == inode->i_mode)) return 0; @@ -775,7 +781,8 @@ static int evm_attr_change(struct dentry *dentry, struct iattr *attr) * Permit update of file attributes when files have a valid EVM signature, * except in the case of them having an immutable portable signature. */ -int evm_inode_setattr(struct dentry *dentry, struct iattr *attr) +int evm_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, + struct iattr *attr) { unsigned int ia_valid = attr->ia_valid; enum integrity_status evm_status; @@ -801,7 +808,7 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr) return 0; if (evm_status == INTEGRITY_PASS_IMMUTABLE && - !evm_attr_change(dentry, attr)) + !evm_attr_change(mnt_userns, dentry, attr)) return 0; integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry), diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index f3a9cc201c8c..7249f16257c7 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -69,10 +69,9 @@ choice hash, defined as 20 bytes, and a null terminated pathname, limited to 255 characters. The 'ima-ng' measurement list template permits both larger hash digests and longer - pathnames. + pathnames. The configured default template can be replaced + by specifying "ima_template=" on the boot command line. - config IMA_TEMPLATE - bool "ima" config IMA_NG_TEMPLATE bool "ima-ng (default)" config IMA_SIG_TEMPLATE @@ -82,7 +81,6 @@ endchoice config IMA_DEFAULT_TEMPLATE string depends on IMA - default "ima" if IMA_TEMPLATE default "ima-ng" if IMA_NG_TEMPLATE default "ima-sig" if IMA_SIG_TEMPLATE @@ -102,19 +100,19 @@ choice config IMA_DEFAULT_HASH_SHA256 bool "SHA256" - depends on CRYPTO_SHA256=y && !IMA_TEMPLATE + depends on CRYPTO_SHA256=y config IMA_DEFAULT_HASH_SHA512 bool "SHA512" - depends on CRYPTO_SHA512=y && !IMA_TEMPLATE + depends on CRYPTO_SHA512=y config IMA_DEFAULT_HASH_WP512 bool "WP512" - depends on CRYPTO_WP512=y && !IMA_TEMPLATE + depends on CRYPTO_WP512=y config IMA_DEFAULT_HASH_SM3 bool "SM3" - depends on CRYPTO_SM3=y && !IMA_TEMPLATE + depends on CRYPTO_SM3=y endchoice config IMA_DEFAULT_HASH diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index a64fb0130b01..c1e76282b5ee 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -14,6 +14,7 @@ #include <linux/xattr.h> #include <linux/evm.h> #include <linux/iversion.h> +#include <linux/fsverity.h> #include "ima.h" @@ -200,6 +201,32 @@ int ima_get_action(struct user_namespace *mnt_userns, struct inode *inode, allowed_algos); } +static int ima_get_verity_digest(struct integrity_iint_cache *iint, + struct ima_max_digest_data *hash) +{ + enum hash_algo verity_alg; + int ret; + + /* + * On failure, 'measure' policy rules will result in a file data + * hash containing 0's. + */ + ret = fsverity_get_digest(iint->inode, hash->digest, &verity_alg); + if (ret) + return ret; + + /* + * Unlike in the case of actually calculating the file hash, in + * the fsverity case regardless of the hash algorithm, return + * the verity digest to be included in the measurement list. A + * mismatch between the verity algorithm and the xattr signature + * algorithm, if one exists, will be detected later. + */ + hash->hdr.algo = verity_alg; + hash->hdr.length = hash_digest_size[verity_alg]; + return 0; +} + /* * ima_collect_measurement - collect file measurement * @@ -217,14 +244,11 @@ int ima_collect_measurement(struct integrity_iint_cache *iint, const char *audit_cause = "failed"; struct inode *inode = file_inode(file); const char *filename = file->f_path.dentry->d_name.name; + struct ima_max_digest_data hash; int result = 0; int length; void *tmpbuf; u64 i_version; - struct { - struct ima_digest_data hdr; - char digest[IMA_MAX_DIGEST_SIZE]; - } hash; /* * Always collect the modsig, because IMA might have already collected @@ -238,22 +262,37 @@ int ima_collect_measurement(struct integrity_iint_cache *iint, goto out; /* - * Dectecting file change is based on i_version. On filesystems - * which do not support i_version, support is limited to an initial - * measurement/appraisal/audit. + * Detecting file change is based on i_version. On filesystems + * which do not support i_version, support was originally limited + * to an initial measurement/appraisal/audit, but was modified to + * assume the file changed. */ i_version = inode_query_iversion(inode); hash.hdr.algo = algo; + hash.hdr.length = hash_digest_size[algo]; /* Initialize hash digest to 0's in case of failure */ memset(&hash.digest, 0, sizeof(hash.digest)); - if (buf) + if (iint->flags & IMA_VERITY_REQUIRED) { + result = ima_get_verity_digest(iint, &hash); + switch (result) { + case 0: + break; + case -ENODATA: + audit_cause = "no-verity-digest"; + break; + default: + audit_cause = "invalid-verity-digest"; + break; + } + } else if (buf) { result = ima_calc_buffer_hash(buf, size, &hash.hdr); - else + } else { result = ima_calc_file_hash(file, &hash.hdr); + } - if (result && result != -EBADF && result != -EINVAL) + if (result == -ENOMEM) goto out; length = sizeof(hash.hdr) + hash.hdr.length; diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 17232bbfb9f9..3e0fbbd99534 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -13,7 +13,9 @@ #include <linux/magic.h> #include <linux/ima.h> #include <linux/evm.h> +#include <linux/fsverity.h> #include <keys/system_keyring.h> +#include <uapi/linux/fsverity.h> #include "ima.h" @@ -183,13 +185,18 @@ enum hash_algo ima_get_hash_algo(const struct evm_ima_xattr_data *xattr_value, return ima_hash_algo; switch (xattr_value->type) { + case IMA_VERITY_DIGSIG: + sig = (typeof(sig))xattr_value; + if (sig->version != 3 || xattr_len <= sizeof(*sig) || + sig->hash_algo >= HASH_ALGO__LAST) + return ima_hash_algo; + return sig->hash_algo; case EVM_IMA_XATTR_DIGSIG: sig = (typeof(sig))xattr_value; if (sig->version != 2 || xattr_len <= sizeof(*sig) || sig->hash_algo >= HASH_ALGO__LAST) return ima_hash_algo; return sig->hash_algo; - break; case IMA_XATTR_DIGEST_NG: /* first byte contains algorithm id */ ret = xattr_value->data[0]; @@ -226,6 +233,40 @@ int ima_read_xattr(struct dentry *dentry, } /* + * calc_file_id_hash - calculate the hash of the ima_file_id struct data + * @type: xattr type [enum evm_ima_xattr_type] + * @algo: hash algorithm [enum hash_algo] + * @digest: pointer to the digest to be hashed + * @hash: (out) pointer to the hash + * + * IMA signature version 3 disambiguates the data that is signed by + * indirectly signing the hash of the ima_file_id structure data. + * + * Signing the ima_file_id struct is currently only supported for + * IMA_VERITY_DIGSIG type xattrs. + * + * Return 0 on success, error code otherwise. + */ +static int calc_file_id_hash(enum evm_ima_xattr_type type, + enum hash_algo algo, const u8 *digest, + struct ima_digest_data *hash) +{ + struct ima_file_id file_id = { + .hash_type = IMA_VERITY_DIGSIG, .hash_algorithm = algo}; + unsigned int unused = HASH_MAX_DIGESTSIZE - hash_digest_size[algo]; + + if (type != IMA_VERITY_DIGSIG) + return -EINVAL; + + memcpy(file_id.hash, digest, hash_digest_size[algo]); + + hash->algo = algo; + hash->length = hash_digest_size[algo]; + + return ima_calc_buffer_hash(&file_id, sizeof(file_id) - unused, hash); +} + +/* * xattr_verify - verify xattr digest or signature * * Verify whether the hash or signature matches the file contents. @@ -236,7 +277,10 @@ 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_max_digest_data hash; + struct signature_v2_hdr *sig; int rc = -EINVAL, hash_start = 0; + int mask; switch (xattr_value->type) { case IMA_XATTR_DIGEST_NG: @@ -246,7 +290,10 @@ static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint, case IMA_XATTR_DIGEST: if (*status != INTEGRITY_PASS_IMMUTABLE) { if (iint->flags & IMA_DIGSIG_REQUIRED) { - *cause = "IMA-signature-required"; + if (iint->flags & IMA_VERITY_REQUIRED) + *cause = "verity-signature-required"; + else + *cause = "IMA-signature-required"; *status = INTEGRITY_FAIL; break; } @@ -274,6 +321,20 @@ static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint, break; case EVM_IMA_XATTR_DIGSIG: set_bit(IMA_DIGSIG, &iint->atomic_flags); + + mask = IMA_DIGSIG_REQUIRED | IMA_VERITY_REQUIRED; + if ((iint->flags & mask) == mask) { + *cause = "verity-signature-required"; + *status = INTEGRITY_FAIL; + break; + } + + sig = (typeof(sig))xattr_value; + if (sig->version >= 3) { + *cause = "invalid-signature-version"; + *status = INTEGRITY_FAIL; + break; + } rc = integrity_digsig_verify(INTEGRITY_KEYRING_IMA, (const char *)xattr_value, xattr_len, @@ -297,6 +358,44 @@ static int xattr_verify(enum ima_hooks func, struct integrity_iint_cache *iint, *status = INTEGRITY_PASS; } break; + case IMA_VERITY_DIGSIG: + set_bit(IMA_DIGSIG, &iint->atomic_flags); + + if (iint->flags & IMA_DIGSIG_REQUIRED) { + if (!(iint->flags & IMA_VERITY_REQUIRED)) { + *cause = "IMA-signature-required"; + *status = INTEGRITY_FAIL; + break; + } + } + + sig = (typeof(sig))xattr_value; + if (sig->version != 3) { + *cause = "invalid-signature-version"; + *status = INTEGRITY_FAIL; + break; + } + + rc = calc_file_id_hash(IMA_VERITY_DIGSIG, iint->ima_hash->algo, + iint->ima_hash->digest, &hash.hdr); + if (rc) { + *cause = "sigv3-hashing-error"; + *status = INTEGRITY_FAIL; + break; + } + + rc = integrity_digsig_verify(INTEGRITY_KEYRING_IMA, + (const char *)xattr_value, + xattr_len, hash.digest, + hash.hdr.length); + if (rc) { + *cause = "invalid-verity-signature"; + *status = INTEGRITY_FAIL; + } else { + *status = INTEGRITY_PASS; + } + + break; default: *status = INTEGRITY_UNKNOWN; *cause = "unknown-ima-data"; @@ -396,8 +495,15 @@ int ima_appraise_measurement(enum ima_hooks func, if (rc && rc != -ENODATA) goto out; - cause = iint->flags & IMA_DIGSIG_REQUIRED ? - "IMA-signature-required" : "missing-hash"; + if (iint->flags & IMA_DIGSIG_REQUIRED) { + if (iint->flags & IMA_VERITY_REQUIRED) + cause = "verity-signature-required"; + else + cause = "IMA-signature-required"; + } else { + cause = "missing-hash"; + } + status = INTEGRITY_NOLABEL; if (file->f_mode & FMODE_CREATED) iint->flags |= IMA_NEW_FILE; @@ -408,7 +514,8 @@ int ima_appraise_measurement(enum ima_hooks func, goto out; } - status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value, rc, iint); + status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value, + rc < 0 ? 0 : rc, iint); switch (status) { case INTEGRITY_PASS: case INTEGRITY_PASS_IMMUTABLE: @@ -643,22 +750,26 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, const struct evm_ima_xattr_data *xvalue = xattr_value; int digsig = 0; int result; + int err; result = ima_protect_xattr(dentry, xattr_name, xattr_value, xattr_value_len); if (result == 1) { if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST)) return -EINVAL; + + err = validate_hash_algo(dentry, xvalue, xattr_value_len); + if (err) + return err; + digsig = (xvalue->type == EVM_IMA_XATTR_DIGSIG); } else if (!strcmp(xattr_name, XATTR_NAME_EVM) && xattr_value_len > 0) { digsig = (xvalue->type == EVM_XATTR_PORTABLE_DIGSIG); } if (result == 1 || evm_revalidate_status(xattr_name)) { - result = validate_hash_algo(dentry, xvalue, xattr_value_len); - if (result) - return result; - ima_reset_appraise_flags(d_backing_inode(dentry), digsig); + if (result == 1) + result = 0; } return result; } diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index a7206cc1d7d1..64499056648a 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -205,6 +205,7 @@ out_array: crypto_free_shash(ima_algo_array[i].tfm); } + kfree(ima_algo_array); out: crypto_free_shash(ima_shash_tfm); return rc; diff --git a/security/integrity/ima/ima_efi.c b/security/integrity/ima/ima_efi.c index 71786d01946f..9db66fe310d4 100644 --- a/security/integrity/ima/ima_efi.c +++ b/security/integrity/ima/ima_efi.c @@ -67,6 +67,8 @@ const char * const *arch_get_ima_policy(void) if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) { if (IS_ENABLED(CONFIG_MODULE_SIG)) set_module_sig_enforced(); + if (IS_ENABLED(CONFIG_KEXEC_SIG)) + set_kexec_sig_enforced(); return sb_arch_rules; } return NULL; diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 3d8e9d5db5aa..cd1683dad3bf 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -452,56 +452,71 @@ static const struct file_operations ima_measure_policy_ops = { int __init ima_fs_init(void) { + int ret; + ima_dir = securityfs_create_dir("ima", integrity_dir); if (IS_ERR(ima_dir)) - return -1; + return PTR_ERR(ima_dir); ima_symlink = securityfs_create_symlink("ima", NULL, "integrity/ima", NULL); - if (IS_ERR(ima_symlink)) + if (IS_ERR(ima_symlink)) { + ret = PTR_ERR(ima_symlink); goto out; + } binary_runtime_measurements = securityfs_create_file("binary_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_measurements_ops); - if (IS_ERR(binary_runtime_measurements)) + if (IS_ERR(binary_runtime_measurements)) { + ret = PTR_ERR(binary_runtime_measurements); goto out; + } ascii_runtime_measurements = securityfs_create_file("ascii_runtime_measurements", S_IRUSR | S_IRGRP, ima_dir, NULL, &ima_ascii_measurements_ops); - if (IS_ERR(ascii_runtime_measurements)) + if (IS_ERR(ascii_runtime_measurements)) { + ret = PTR_ERR(ascii_runtime_measurements); goto out; + } 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)) + if (IS_ERR(runtime_measurements_count)) { + ret = PTR_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)) + if (IS_ERR(violations)) { + ret = PTR_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)) + if (IS_ERR(ima_policy)) { + ret = PTR_ERR(ima_policy); goto out; + } return 0; out: + securityfs_remove(ima_policy); securityfs_remove(violations); securityfs_remove(runtime_measurements_count); securityfs_remove(ascii_runtime_measurements); securityfs_remove(binary_runtime_measurements); securityfs_remove(ima_symlink); securityfs_remove(ima_dir); - securityfs_remove(ima_policy); - return -1; + + return ret; } diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index b26fa67476b4..63979aefc95f 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -47,12 +47,9 @@ static int __init ima_add_boot_aggregate(void) struct integrity_iint_cache tmp_iint, *iint = &tmp_iint; struct ima_event_data event_data = { .iint = iint, .filename = boot_aggregate_name }; + struct ima_max_digest_data hash; int result = -ENOMEM; int violation = 0; - struct { - struct ima_digest_data hdr; - char digest[TPM_MAX_DIGEST_SIZE]; - } hash; memset(iint, 0, sizeof(*iint)); memset(&hash, 0, sizeof(hash)); diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 13753136f03f..419dc405c831 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -137,7 +137,7 @@ void ima_add_kexec_buffer(struct kimage *image) /* * Restore the measurement list from the previous kernel. */ -void ima_load_kexec_buffer(void) +void __init ima_load_kexec_buffer(void) { void *kexec_buffer = NULL; size_t kexec_buffer_size = 0; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 8c6e4514d494..040b03ddc1c7 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -263,7 +263,7 @@ static int process_measurement(struct file *file, const struct cred *cred, /* reset appraisal flags if ima_inode_post_setattr was called */ iint->flags &= ~(IMA_APPRAISE | IMA_APPRAISED | IMA_APPRAISE_SUBMASK | IMA_APPRAISED_SUBMASK | - IMA_ACTION_FLAGS); + IMA_NONACTION_FLAGS); /* * Re-evaulate the file if either the xattr has changed or the @@ -335,7 +335,7 @@ static int process_measurement(struct file *file, const struct cred *cred, hash_algo = ima_get_hash_algo(xattr_value, xattr_len); rc = ima_collect_measurement(iint, file, buf, size, hash_algo, modsig); - if (rc != 0 && rc != -EBADF && rc != -EINVAL) + if (rc == -ENOMEM) goto out_locked; if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */ @@ -418,6 +418,7 @@ int ima_file_mmap(struct file *file, unsigned long prot) /** * ima_file_mprotect - based on policy, limit mprotect change + * @vma: vm_area_struct protection is set to * @prot: contains the protection that will be applied by the kernel. * * Files can be mmap'ed read/write and later changed to execute to circumvent @@ -431,7 +432,7 @@ int ima_file_mmap(struct file *file, unsigned long prot) int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot) { struct ima_template_desc *template = NULL; - struct file *file = vma->vm_file; + struct file *file; char filename[NAME_MAX]; char *pathbuf = NULL; const char *pathname = NULL; @@ -519,20 +520,38 @@ int ima_file_check(struct file *file, int mask) } EXPORT_SYMBOL_GPL(ima_file_check); -static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) +static int __ima_inode_hash(struct inode *inode, struct file *file, char *buf, + size_t buf_size) { - struct integrity_iint_cache *iint; - int hash_algo; + struct integrity_iint_cache *iint = NULL, tmp_iint; + int rc, hash_algo; - if (!ima_policy_flag) - return -EOPNOTSUPP; + if (ima_policy_flag) { + iint = integrity_iint_find(inode); + if (iint) + mutex_lock(&iint->mutex); + } + + if ((!iint || !(iint->flags & IMA_COLLECTED)) && file) { + if (iint) + mutex_unlock(&iint->mutex); + + memset(&tmp_iint, 0, sizeof(tmp_iint)); + tmp_iint.inode = inode; + mutex_init(&tmp_iint.mutex); + + rc = ima_collect_measurement(&tmp_iint, file, NULL, 0, + ima_hash_algo, NULL); + if (rc < 0) + return -EOPNOTSUPP; + + iint = &tmp_iint; + mutex_lock(&iint->mutex); + } - iint = integrity_iint_find(inode); if (!iint) return -EOPNOTSUPP; - mutex_lock(&iint->mutex); - /* * ima_file_hash can be called when ima_collect_measurement has still * not been called, we might not always have a hash. @@ -551,12 +570,14 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) hash_algo = iint->ima_hash->algo; mutex_unlock(&iint->mutex); + if (iint == &tmp_iint) + kfree(iint->ima_hash); + return hash_algo; } /** - * ima_file_hash - return the stored measurement if a file has been hashed and - * is in the iint cache. + * ima_file_hash - return a measurement of the file * @file: pointer to the file * @buf: buffer in which to store the hash * @buf_size: length of the buffer @@ -569,7 +590,7 @@ static int __ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) * The file hash returned is based on the entire file, including the appended * signature. * - * If IMA is disabled or if no measurement is available, return -EOPNOTSUPP. + * If the measurement cannot be performed, return -EOPNOTSUPP. * If the parameters are incorrect, return -EINVAL. */ int ima_file_hash(struct file *file, char *buf, size_t buf_size) @@ -577,7 +598,7 @@ int ima_file_hash(struct file *file, char *buf, size_t buf_size) if (!file) return -EINVAL; - return __ima_inode_hash(file_inode(file), buf, buf_size); + return __ima_inode_hash(file_inode(file), file, buf, buf_size); } EXPORT_SYMBOL_GPL(ima_file_hash); @@ -604,14 +625,14 @@ int ima_inode_hash(struct inode *inode, char *buf, size_t buf_size) if (!inode) return -EINVAL; - return __ima_inode_hash(inode, buf, buf_size); + return __ima_inode_hash(inode, NULL, buf, buf_size); } EXPORT_SYMBOL_GPL(ima_inode_hash); /** * ima_post_create_tmpfile - mark newly created tmpfile as new - * @mnt_userns: user namespace of the mount the inode was found from - * @file : newly created tmpfile + * @mnt_userns: user namespace of the mount the inode was found from + * @inode: inode of the newly created tmpfile * * No measuring, appraising or auditing of newly created tmpfiles is needed. * Skip calling process_measurement(), but indicate which newly, created @@ -643,7 +664,7 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns, /** * ima_post_path_mknod - mark as a new inode - * @mnt_userns: user namespace of the mount the inode was found from + * @mnt_userns: user namespace of the mount the inode was found from * @dentry: newly created dentry * * Mark files created via the mknodat syscall as new, so that the @@ -764,7 +785,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, * call to ima_post_load_data(). * * Callers of this LSM hook can not measure, appraise, or audit the - * data provided by userspace. Enforce policy rules requring a file + * data provided by userspace. Enforce policy rules requiring a file * signature (eg. kexec'ed kernel image). * * For permission return 0, otherwise return -EACCES. @@ -814,8 +835,8 @@ int ima_load_data(enum kernel_load_data_id id, bool contents) * ima_post_load_data - appraise decision based on policy * @buf: pointer to in memory file contents * @size: size of in memory file contents - * @id: kernel load data caller identifier - * @description: @id-specific description of contents + * @load_id: kernel load data caller identifier + * @description: @load_id-specific description of contents * * Measure/appraise/audit in memory buffer based on policy. Policy rules * are written in terms of a policy identifier. @@ -874,10 +895,7 @@ int process_buffer_measurement(struct user_namespace *mnt_userns, .buf = buf, .buf_len = size}; struct ima_template_desc *template; - struct { - struct ima_digest_data hdr; - char digest[IMA_MAX_DIGEST_SIZE]; - } hash = {}; + struct ima_max_digest_data hash; char digest_hash[IMA_MAX_DIGEST_SIZE]; int digest_hash_len = hash_digest_size[ima_hash_algo]; int violation = 0; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 320ca80aacab..a8802b8da946 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -16,7 +16,6 @@ #include <linux/parser.h> #include <linux/slab.h> #include <linux/rculist.h> -#include <linux/genhd.h> #include <linux/seq_file.h> #include <linux/ima.h> @@ -429,7 +428,7 @@ static int ima_lsm_update_rule(struct ima_rule_entry *entry) /* * ima_lsm_copy_rule() shallow copied all references, except for the * LSM references, from entry to nentry so we only want to free the LSM - * references and the entry itself. All other memory refrences will now + * references and the entry itself. All other memory references will now * be owned by nentry. */ ima_lsm_free_rule(entry); @@ -712,7 +711,7 @@ int ima_match_policy(struct user_namespace *mnt_userns, struct inode *inode, func, mask, func_data)) continue; - action |= entry->flags & IMA_ACTION_FLAGS; + action |= entry->flags & IMA_NONACTION_FLAGS; action |= entry->action & IMA_DO_MASK; if (entry->action & IMA_APPRAISE) { @@ -1024,6 +1023,7 @@ enum policy_opt { Opt_fowner_gt, Opt_fgroup_gt, Opt_uid_lt, Opt_euid_lt, Opt_gid_lt, Opt_egid_lt, Opt_fowner_lt, Opt_fgroup_lt, + Opt_digest_type, Opt_appraise_type, Opt_appraise_flag, Opt_appraise_algos, Opt_permit_directio, Opt_pcr, Opt_template, Opt_keyrings, Opt_label, Opt_err @@ -1066,6 +1066,7 @@ static const match_table_t policy_tokens = { {Opt_egid_lt, "egid<%s"}, {Opt_fowner_lt, "fowner<%s"}, {Opt_fgroup_lt, "fgroup<%s"}, + {Opt_digest_type, "digest_type=%s"}, {Opt_appraise_type, "appraise_type=%s"}, {Opt_appraise_flag, "appraise_flag=%s"}, {Opt_appraise_algos, "appraise_algos=%s"}, @@ -1173,6 +1174,21 @@ static void check_template_modsig(const struct ima_template_desc *template) #undef MSG } +/* + * Warn if the template does not contain the given field. + */ +static void check_template_field(const struct ima_template_desc *template, + const char *field, const char *msg) +{ + int i; + + for (i = 0; i < template->num_fields; i++) + if (!strcmp(template->fields[i]->field_id, field)) + return; + + pr_notice_once("%s", msg); +} + static bool ima_validate_rule(struct ima_rule_entry *entry) { /* Ensure that the action is set and is compatible with the flags */ @@ -1215,7 +1231,8 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) IMA_INMASK | IMA_EUID | IMA_PCR | IMA_FSNAME | IMA_GID | IMA_EGID | IMA_FGROUP | IMA_DIGSIG_REQUIRED | - IMA_PERMIT_DIRECTIO | IMA_VALIDATE_ALGOS)) + IMA_PERMIT_DIRECTIO | IMA_VALIDATE_ALGOS | + IMA_VERITY_REQUIRED)) return false; break; @@ -1293,6 +1310,18 @@ static bool ima_validate_rule(struct ima_rule_entry *entry) !(entry->flags & IMA_MODSIG_ALLOWED)) return false; + /* + * Unlike for regular IMA 'appraise' policy rules where security.ima + * xattr may contain either a file hash or signature, the security.ima + * xattr for fsverity must contain a file signature (sigv3). Ensure + * that 'appraise' rules for fsverity require file signatures by + * checking the IMA_DIGSIG_REQUIRED flag is set. + */ + if (entry->action == APPRAISE && + (entry->flags & IMA_VERITY_REQUIRED) && + !(entry->flags & IMA_DIGSIG_REQUIRED)) + return false; + return true; } @@ -1708,16 +1737,39 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) LSM_SUBJ_TYPE, AUDIT_SUBJ_TYPE); break; + case Opt_digest_type: + ima_log_string(ab, "digest_type", args[0].from); + if (entry->flags & IMA_DIGSIG_REQUIRED) + result = -EINVAL; + else if ((strcmp(args[0].from, "verity")) == 0) + entry->flags |= IMA_VERITY_REQUIRED; + else + result = -EINVAL; + break; case Opt_appraise_type: ima_log_string(ab, "appraise_type", args[0].from); - if ((strcmp(args[0].from, "imasig")) == 0) - entry->flags |= IMA_DIGSIG_REQUIRED; - else if (IS_ENABLED(CONFIG_IMA_APPRAISE_MODSIG) && - strcmp(args[0].from, "imasig|modsig") == 0) - entry->flags |= IMA_DIGSIG_REQUIRED | + + if ((strcmp(args[0].from, "imasig")) == 0) { + if (entry->flags & IMA_VERITY_REQUIRED) + result = -EINVAL; + else + entry->flags |= IMA_DIGSIG_REQUIRED; + } else if (strcmp(args[0].from, "sigv3") == 0) { + /* Only fsverity supports sigv3 for now */ + if (entry->flags & IMA_VERITY_REQUIRED) + entry->flags |= IMA_DIGSIG_REQUIRED; + else + result = -EINVAL; + } else if (IS_ENABLED(CONFIG_IMA_APPRAISE_MODSIG) && + strcmp(args[0].from, "imasig|modsig") == 0) { + if (entry->flags & IMA_VERITY_REQUIRED) + result = -EINVAL; + else + entry->flags |= IMA_DIGSIG_REQUIRED | IMA_MODSIG_ALLOWED; - else + } else { result = -EINVAL; + } break; case Opt_appraise_flag: ima_log_string(ab, "appraise_flag", args[0].from); @@ -1798,6 +1850,15 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) check_template_modsig(template_desc); } + /* d-ngv2 template field recommended for unsigned fs-verity digests */ + if (!result && entry->action == MEASURE && + entry->flags & IMA_VERITY_REQUIRED) { + template_desc = entry->template ? entry->template : + ima_template_desc_current(); + check_template_field(template_desc, "d-ngv2", + "verity rules should include d-ngv2"); + } + audit_log_format(ab, "res=%d", !result); audit_log_end(ab); return result; @@ -1967,6 +2028,14 @@ int ima_policy_show(struct seq_file *m, void *v) rcu_read_lock(); + /* Do not print rules with inactive LSM labels */ + for (i = 0; i < MAX_LSM_RULES; i++) { + if (entry->lsm[i].args_p && !entry->lsm[i].rule) { + rcu_read_unlock(); + return 0; + } + } + if (entry->action & MEASURE) seq_puts(m, pt(Opt_measure)); if (entry->action & DONT_MEASURE) @@ -2142,11 +2211,15 @@ int ima_policy_show(struct seq_file *m, void *v) if (entry->template) seq_printf(m, "template=%s ", entry->template->name); if (entry->flags & IMA_DIGSIG_REQUIRED) { - if (entry->flags & IMA_MODSIG_ALLOWED) + if (entry->flags & IMA_VERITY_REQUIRED) + seq_puts(m, "appraise_type=sigv3 "); + else if (entry->flags & IMA_MODSIG_ALLOWED) seq_puts(m, "appraise_type=imasig|modsig "); else seq_puts(m, "appraise_type=imasig "); } + if (entry->flags & IMA_VERITY_REQUIRED) + seq_puts(m, "digest_type=verity "); if (entry->flags & IMA_CHECK_BLACKLIST) seq_puts(m, "appraise_flag=check_blacklist "); if (entry->flags & IMA_PERMIT_DIRECTIO) @@ -2174,6 +2247,10 @@ bool ima_appraise_signature(enum kernel_read_file_id id) if (id >= READING_MAX_ID) return false; + if (id == READING_KEXEC_IMAGE && !(ima_appraise & IMA_APPRAISE_ENFORCE) + && security_locked_down(LOCKDOWN_KEXEC)) + return false; + func = read_idmap[id] ?: FILE_CHECK; rcu_read_lock(); diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c index 694560396be0..c25079faa208 100644 --- a/security/integrity/ima/ima_template.c +++ b/security/integrity/ima/ima_template.c @@ -20,6 +20,8 @@ static struct ima_template_desc builtin_templates[] = { {.name = IMA_TEMPLATE_IMA_NAME, .fmt = IMA_TEMPLATE_IMA_FMT}, {.name = "ima-ng", .fmt = "d-ng|n-ng"}, {.name = "ima-sig", .fmt = "d-ng|n-ng|sig"}, + {.name = "ima-ngv2", .fmt = "d-ngv2|n-ng"}, + {.name = "ima-sigv2", .fmt = "d-ngv2|n-ng|sig"}, {.name = "ima-buf", .fmt = "d-ng|n-ng|buf"}, {.name = "ima-modsig", .fmt = "d-ng|n-ng|sig|d-modsig|modsig"}, {.name = "evm-sig", @@ -29,6 +31,7 @@ static struct ima_template_desc builtin_templates[] = { static LIST_HEAD(defined_templates); static DEFINE_SPINLOCK(template_list); +static int template_setup_done; static const struct ima_template_field supported_fields[] = { {.field_id = "d", .field_init = ima_eventdigest_init, @@ -37,6 +40,8 @@ static const struct ima_template_field supported_fields[] = { .field_show = ima_show_template_string}, {.field_id = "d-ng", .field_init = ima_eventdigest_ng_init, .field_show = ima_show_template_digest_ng}, + {.field_id = "d-ngv2", .field_init = ima_eventdigest_ngv2_init, + .field_show = ima_show_template_digest_ngv2}, {.field_id = "n-ng", .field_init = ima_eventname_ng_init, .field_show = ima_show_template_string}, {.field_id = "sig", .field_init = ima_eventsig_init, @@ -101,10 +106,11 @@ static int __init ima_template_setup(char *str) struct ima_template_desc *template_desc; int template_len = strlen(str); - if (ima_template) + if (template_setup_done) return 1; - ima_init_template_list(); + if (!ima_template) + ima_init_template_list(); /* * Verify that a template with the supplied name exists. @@ -128,6 +134,7 @@ static int __init ima_template_setup(char *str) } ima_template = template_desc; + template_setup_done = 1; return 1; } __setup("ima_template=", ima_template_setup); @@ -136,7 +143,7 @@ static int __init ima_template_fmt_setup(char *str) { int num_templates = ARRAY_SIZE(builtin_templates); - if (ima_template) + if (template_setup_done) return 1; if (template_desc_init_fields(str, NULL, NULL) < 0) { @@ -147,6 +154,7 @@ static int __init ima_template_fmt_setup(char *str) builtin_templates[num_templates - 1].fmt = str; ima_template = builtin_templates + num_templates - 1; + template_setup_done = 1; return 1; } diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c index ca017cae73eb..7bf9b1507220 100644 --- a/security/integrity/ima/ima_template_lib.c +++ b/security/integrity/ima/ima_template_lib.c @@ -24,11 +24,24 @@ static bool ima_template_hash_algo_allowed(u8 algo) enum data_formats { DATA_FMT_DIGEST = 0, DATA_FMT_DIGEST_WITH_ALGO, + DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO, DATA_FMT_STRING, DATA_FMT_HEX, DATA_FMT_UINT }; +enum digest_type { + DIGEST_TYPE_IMA, + DIGEST_TYPE_VERITY, + DIGEST_TYPE__LAST +}; + +#define DIGEST_TYPE_NAME_LEN_MAX 7 /* including NUL */ +static const char * const digest_type_name[DIGEST_TYPE__LAST] = { + [DIGEST_TYPE_IMA] = "ima", + [DIGEST_TYPE_VERITY] = "verity" +}; + static int ima_write_template_field_data(const void *data, const u32 datalen, enum data_formats datafmt, struct ima_field_data *field_data) @@ -72,8 +85,9 @@ static void ima_show_template_data_ascii(struct seq_file *m, u32 buflen = field_data->len; switch (datafmt) { + case DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO: case DATA_FMT_DIGEST_WITH_ALGO: - buf_ptr = strnchr(field_data->data, buflen, ':'); + buf_ptr = strrchr(field_data->data, ':'); if (buf_ptr != field_data->data) seq_printf(m, "%s", field_data->data); @@ -178,6 +192,14 @@ void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show, field_data); } +void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show, + struct ima_field_data *field_data) +{ + ima_show_template_field_data(m, show, + DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO, + field_data); +} + void ima_show_template_string(struct seq_file *m, enum ima_show_type show, struct ima_field_data *field_data) { @@ -265,26 +287,35 @@ int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp, } static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize, - u8 hash_algo, + u8 digest_type, u8 hash_algo, struct ima_field_data *field_data) { /* * digest formats: * - DATA_FMT_DIGEST: digest - * - DATA_FMT_DIGEST_WITH_ALGO: [<hash algo>] + ':' + '\0' + digest, - * where <hash algo> is provided if the hash algoritm is not - * SHA1 or MD5 + * - DATA_FMT_DIGEST_WITH_ALGO: <hash algo> + ':' + '\0' + digest, + * - DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO: + * <digest type> + ':' + <hash algo> + ':' + '\0' + digest, + * + * where 'DATA_FMT_DIGEST' is the original digest format ('d') + * with a hash size limitation of 20 bytes, + * where <digest type> is either "ima" or "verity", + * where <hash algo> is the hash_algo_name[] string. */ - u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 }; + u8 buffer[DIGEST_TYPE_NAME_LEN_MAX + CRYPTO_MAX_ALG_NAME + 2 + + IMA_MAX_DIGEST_SIZE] = { 0 }; enum data_formats fmt = DATA_FMT_DIGEST; u32 offset = 0; - if (hash_algo < HASH_ALGO__LAST) { + if (digest_type < DIGEST_TYPE__LAST && hash_algo < HASH_ALGO__LAST) { + fmt = DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO; + offset += 1 + sprintf(buffer, "%s:%s:", + digest_type_name[digest_type], + hash_algo_name[hash_algo]); + } else if (hash_algo < HASH_ALGO__LAST) { fmt = DATA_FMT_DIGEST_WITH_ALGO; - offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s", - hash_algo_name[hash_algo]); - buffer[offset] = ':'; - offset += 2; + offset += 1 + sprintf(buffer, "%s:", + hash_algo_name[hash_algo]); } if (digest) @@ -292,10 +323,10 @@ static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize, else /* * If digest is NULL, the event being recorded is a violation. - * Make room for the digest by increasing the offset of - * IMA_DIGEST_SIZE. + * Make room for the digest by increasing the offset by the + * hash algorithm digest size. */ - offset += IMA_DIGEST_SIZE; + offset += hash_digest_size[hash_algo]; return ima_write_template_field_data(buffer, offset + digestsize, fmt, field_data); @@ -307,10 +338,7 @@ static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize, int ima_eventdigest_init(struct ima_event_data *event_data, struct ima_field_data *field_data) { - struct { - struct ima_digest_data hdr; - char digest[IMA_MAX_DIGEST_SIZE]; - } hash; + struct ima_max_digest_data hash; u8 *cur_digest = NULL; u32 cur_digestsize = 0; struct inode *inode; @@ -362,7 +390,8 @@ int ima_eventdigest_init(struct ima_event_data *event_data, cur_digestsize = hash.hdr.length; out: return ima_eventdigest_init_common(cur_digest, cur_digestsize, - HASH_ALGO__LAST, field_data); + DIGEST_TYPE__LAST, HASH_ALGO__LAST, + field_data); } /* @@ -371,8 +400,32 @@ out: int ima_eventdigest_ng_init(struct ima_event_data *event_data, struct ima_field_data *field_data) { - u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1; + u8 *cur_digest = NULL, hash_algo = ima_hash_algo; + u32 cur_digestsize = 0; + + if (event_data->violation) /* recording a violation. */ + goto out; + + cur_digest = event_data->iint->ima_hash->digest; + cur_digestsize = event_data->iint->ima_hash->length; + + hash_algo = event_data->iint->ima_hash->algo; +out: + return ima_eventdigest_init_common(cur_digest, cur_digestsize, + DIGEST_TYPE__LAST, hash_algo, + field_data); +} + +/* + * This function writes the digest of an event (without size limit), + * prefixed with both the digest type and hash algorithm. + */ +int ima_eventdigest_ngv2_init(struct ima_event_data *event_data, + struct ima_field_data *field_data) +{ + u8 *cur_digest = NULL, hash_algo = ima_hash_algo; u32 cur_digestsize = 0; + u8 digest_type = DIGEST_TYPE_IMA; if (event_data->violation) /* recording a violation. */ goto out; @@ -381,9 +434,12 @@ int ima_eventdigest_ng_init(struct ima_event_data *event_data, cur_digestsize = event_data->iint->ima_hash->length; hash_algo = event_data->iint->ima_hash->algo; + if (event_data->iint->flags & IMA_VERITY_REQUIRED) + digest_type = DIGEST_TYPE_VERITY; out: return ima_eventdigest_init_common(cur_digest, cur_digestsize, - hash_algo, field_data); + digest_type, hash_algo, + field_data); } /* @@ -418,7 +474,8 @@ int ima_eventdigest_modsig_init(struct ima_event_data *event_data, } return ima_eventdigest_init_common(cur_digest, cur_digestsize, - hash_algo, field_data); + DIGEST_TYPE__LAST, hash_algo, + field_data); } static int ima_eventname_init_common(struct ima_event_data *event_data, @@ -478,7 +535,9 @@ 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)) + if (!xattr_value || + (xattr_value->type != EVM_IMA_XATTR_DIGSIG && + xattr_value->type != IMA_VERITY_DIGSIG)) return ima_eventevmsig_init(event_data, field_data); return ima_write_template_field_data(xattr_value, event_data->xattr_len, diff --git a/security/integrity/ima/ima_template_lib.h b/security/integrity/ima/ima_template_lib.h index c71f1de95753..9f7c335f304f 100644 --- a/security/integrity/ima/ima_template_lib.h +++ b/security/integrity/ima/ima_template_lib.h @@ -21,6 +21,8 @@ void ima_show_template_digest(struct seq_file *m, enum ima_show_type show, struct ima_field_data *field_data); void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show, struct ima_field_data *field_data); +void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show, + struct ima_field_data *field_data); void ima_show_template_string(struct seq_file *m, enum ima_show_type show, struct ima_field_data *field_data); void ima_show_template_sig(struct seq_file *m, enum ima_show_type show, @@ -38,6 +40,8 @@ int ima_eventname_init(struct ima_event_data *event_data, struct ima_field_data *field_data); int ima_eventdigest_ng_init(struct ima_event_data *event_data, struct ima_field_data *field_data); +int ima_eventdigest_ngv2_init(struct ima_event_data *event_data, + struct ima_field_data *field_data); int ima_eventdigest_modsig_init(struct ima_event_data *event_data, struct ima_field_data *field_data); int ima_eventname_ng_init(struct ima_event_data *event_data, diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 547425c20e11..7167a6e99bdc 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -15,6 +15,7 @@ #include <linux/types.h> #include <linux/integrity.h> #include <crypto/sha1.h> +#include <crypto/hash.h> #include <linux/key.h> #include <linux/audit.h> @@ -30,8 +31,8 @@ #define IMA_HASH 0x00000100 #define IMA_HASHED 0x00000200 -/* iint cache flags */ -#define IMA_ACTION_FLAGS 0xff000000 +/* iint policy rule cache flags */ +#define IMA_NONACTION_FLAGS 0xff000000 #define IMA_DIGSIG_REQUIRED 0x01000000 #define IMA_PERMIT_DIRECTIO 0x02000000 #define IMA_NEW_FILE 0x04000000 @@ -39,6 +40,7 @@ #define IMA_FAIL_UNVERIFIABLE_SIGS 0x10000000 #define IMA_MODSIG_ALLOWED 0x20000000 #define IMA_CHECK_BLACKLIST 0x40000000 +#define IMA_VERITY_REQUIRED 0x80000000 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ IMA_HASH | IMA_APPRAISE_SUBMASK) @@ -77,6 +79,7 @@ enum evm_ima_xattr_type { EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, EVM_XATTR_PORTABLE_DIGSIG, + IMA_VERITY_DIGSIG, IMA_XATTR_LAST }; @@ -91,7 +94,7 @@ struct evm_xattr { u8 digest[SHA1_DIGEST_SIZE]; } __packed; -#define IMA_MAX_DIGEST_SIZE 64 +#define IMA_MAX_DIGEST_SIZE HASH_MAX_DIGESTSIZE struct ima_digest_data { u8 algo; @@ -111,7 +114,23 @@ struct ima_digest_data { } __packed; /* - * signature format v2 - for using with asymmetric keys + * Instead of wrapping the ima_digest_data struct inside a local structure + * with the maximum hash size, define ima_max_digest_data struct. + */ +struct ima_max_digest_data { + struct ima_digest_data hdr; + u8 digest[HASH_MAX_DIGESTSIZE]; +} __packed; + +/* + * signature header format v2 - for using with asymmetric keys + * + * The signature_v2_hdr struct includes a signature format version + * to simplify defining new signature formats. + * + * signature format: + * version 2: regular file data hash based signature + * version 3: struct ima_file_id data based signature */ struct signature_v2_hdr { uint8_t type; /* xattr type */ @@ -122,6 +141,20 @@ struct signature_v2_hdr { uint8_t sig[]; /* signature payload */ } __packed; +/* + * IMA signature version 3 disambiguates the data that is signed, by + * indirectly signing the hash of the ima_file_id structure data, + * containing either the fsverity_descriptor struct digest or, in the + * future, the regular IMA file hash. + * + * (The hash of the ima_file_id structure is only of the portion used.) + */ +struct ima_file_id { + __u8 hash_type; /* xattr type [enum evm_ima_xattr_type] */ + __u8 hash_algorithm; /* Digest algorithm [enum hash_algo] */ + __u8 hash[HASH_MAX_DIGESTSIZE]; +} __packed; + /* integrity data associated with an inode */ struct integrity_iint_cache { struct rb_node rb_node; /* rooted in integrity_iint_tree */ @@ -151,7 +184,8 @@ int integrity_kernel_read(struct file *file, loff_t offset, #define INTEGRITY_KEYRING_EVM 0 #define INTEGRITY_KEYRING_IMA 1 #define INTEGRITY_KEYRING_PLATFORM 2 -#define INTEGRITY_KEYRING_MAX 3 +#define INTEGRITY_KEYRING_MACHINE 3 +#define INTEGRITY_KEYRING_MAX 4 extern struct dentry *integrity_dir; @@ -283,3 +317,17 @@ static inline void __init add_to_platform_keyring(const char *source, { } #endif + +#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING +void __init add_to_machine_keyring(const char *source, const void *data, size_t len); +bool __init trust_moklist(void); +#else +static inline void __init add_to_machine_keyring(const char *source, + const void *data, size_t len) +{ +} +static inline bool __init trust_moklist(void) +{ + return false; +} +#endif diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c index 29220056207f..0ec5e4c22cb2 100644 --- a/security/integrity/integrity_audit.c +++ b/security/integrity/integrity_audit.c @@ -45,6 +45,8 @@ void integrity_audit_message(int audit_msgno, struct inode *inode, return; ab = audit_log_start(audit_context(), GFP_KERNEL, audit_msgno); + if (!ab) + return; audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u", task_pid_nr(current), from_kuid(&init_user_ns, current_uid()), diff --git a/security/integrity/platform_certs/keyring_handler.c b/security/integrity/platform_certs/keyring_handler.c index 5604bd57c990..8a1124e4d769 100644 --- a/security/integrity/platform_certs/keyring_handler.c +++ b/security/integrity/platform_certs/keyring_handler.c @@ -9,6 +9,7 @@ #include <keys/asymmetric-type.h> #include <keys/system_keyring.h> #include "../integrity.h" +#include "keyring_handler.h" static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID; static efi_guid_t efi_cert_x509_sha256_guid __initdata = @@ -16,34 +17,12 @@ static efi_guid_t efi_cert_x509_sha256_guid __initdata = static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID; /* - * Blacklist a hash. - */ -static __init void uefi_blacklist_hash(const char *source, const void *data, - size_t len, const char *type, - size_t type_len) -{ - char *hash, *p; - - hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL); - if (!hash) - return; - p = memcpy(hash, type, type_len); - p += type_len; - bin2hex(p, data, len); - p += len * 2; - *p = 0; - - mark_hash_blacklisted(hash); - kfree(hash); -} - -/* * Blacklist an X509 TBS hash. */ static __init void uefi_blacklist_x509_tbs(const char *source, const void *data, size_t len) { - uefi_blacklist_hash(source, data, len, "tbs:", 4); + mark_hash_blacklisted(data, len, BLACKLIST_HASH_X509_TBS); } /* @@ -52,7 +31,7 @@ static __init void uefi_blacklist_x509_tbs(const char *source, static __init void uefi_blacklist_binary(const char *source, const void *data, size_t len) { - uefi_blacklist_hash(source, data, len, "bin:", 4); + mark_hash_blacklisted(data, len, BLACKLIST_HASH_BINARY); } /* @@ -66,13 +45,28 @@ static __init void uefi_revocation_list_x509(const char *source, /* * Return the appropriate handler for particular signature list types found in - * the UEFI db and MokListRT tables. + * the UEFI db tables. */ __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type) { if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) return add_to_platform_keyring; - return 0; + return NULL; +} + +/* + * Return the appropriate handler for particular signature list types found in + * the MokListRT tables. + */ +__init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type) +{ + if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) { + if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && trust_moklist()) + return add_to_machine_keyring; + else + return add_to_platform_keyring; + } + return NULL; } /* @@ -87,5 +81,5 @@ __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type) return uefi_blacklist_binary; if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) return uefi_revocation_list_x509; - return 0; + return NULL; } diff --git a/security/integrity/platform_certs/keyring_handler.h b/security/integrity/platform_certs/keyring_handler.h index 2462bfa08fe3..212d894a8c0c 100644 --- a/security/integrity/platform_certs/keyring_handler.h +++ b/security/integrity/platform_certs/keyring_handler.h @@ -25,8 +25,21 @@ void blacklist_binary(const char *source, const void *data, size_t len); efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type); /* + * Return the handler for particular signature list types found in the mok. + */ +efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type); + +/* * Return the handler for particular signature list types found in the dbx. */ efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type); #endif + +#ifndef UEFI_QUIRK_SKIP_CERT +#define UEFI_QUIRK_SKIP_CERT(vendor, product) \ + .matches = { \ + DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ + DMI_MATCH(DMI_PRODUCT_NAME, product), \ + }, +#endif diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c index 08b6d12f99b4..b78753d27d8e 100644 --- a/security/integrity/platform_certs/load_uefi.c +++ b/security/integrity/platform_certs/load_uefi.c @@ -3,6 +3,7 @@ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/cred.h> +#include <linux/dmi.h> #include <linux/err.h> #include <linux/efi.h> #include <linux/slab.h> @@ -13,6 +14,31 @@ #include "keyring_handler.h" /* + * On T2 Macs reading the db and dbx efi variables to load UEFI Secure Boot + * certificates causes occurrence of a page fault in Apple's firmware and + * a crash disabling EFI runtime services. The following quirk skips reading + * these variables. + */ +static const struct dmi_system_id uefi_skip_cert[] = { + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,3") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,4") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,3") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,4") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir9,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "Macmini8,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacPro7,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,2") }, + { } +}; + +/* * Look to see if a UEFI variable called MokIgnoreDB exists and return true if * it does. * @@ -95,7 +121,7 @@ static int __init load_moklist_certs(void) rc = parse_efi_signature_list("UEFI:MokListRT (MOKvar table)", mokvar_entry->data, mokvar_entry->data_size, - get_handler_for_db); + get_handler_for_mok); /* All done if that worked. */ if (!rc) return rc; @@ -110,7 +136,7 @@ static int __init load_moklist_certs(void) mok = get_cert_list(L"MokListRT", &mok_var, &moksize, &status); if (mok) { rc = parse_efi_signature_list("UEFI:MokListRT", - mok, moksize, get_handler_for_db); + mok, moksize, get_handler_for_mok); kfree(mok); if (rc) pr_err("Couldn't parse MokListRT signatures: %d\n", rc); @@ -138,6 +164,13 @@ static int __init load_uefi_certs(void) unsigned long dbsize = 0, dbxsize = 0, mokxsize = 0; efi_status_t status; int rc = 0; + const struct dmi_system_id *dmi_id; + + dmi_id = dmi_first_match(uefi_skip_cert); + if (dmi_id) { + pr_err("Reading UEFI Secure Boot Certs is not supported on T2 Macs.\n"); + return false; + } if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) return false; diff --git a/security/integrity/platform_certs/machine_keyring.c b/security/integrity/platform_certs/machine_keyring.c new file mode 100644 index 000000000000..7aaed7950b6e --- /dev/null +++ b/security/integrity/platform_certs/machine_keyring.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Machine keyring routines. + * + * Copyright (c) 2021, Oracle and/or its affiliates. + */ + +#include <linux/efi.h> +#include "../integrity.h" + +static bool trust_mok; + +static __init int machine_keyring_init(void) +{ + int rc; + + rc = integrity_init_keyring(INTEGRITY_KEYRING_MACHINE); + if (rc) + return rc; + + pr_notice("Machine keyring initialized\n"); + return 0; +} +device_initcall(machine_keyring_init); + +void __init add_to_machine_keyring(const char *source, const void *data, size_t len) +{ + key_perm_t perm; + int rc; + + perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW; + rc = integrity_load_cert(INTEGRITY_KEYRING_MACHINE, source, data, len, perm); + + /* + * Some MOKList keys may not pass the machine keyring restrictions. + * If the restriction check does not pass and the platform keyring + * is configured, try to add it into that keyring instead. + */ + if (rc && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) + rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source, + data, len, perm); + + if (rc) + pr_info("Error adding keys to machine keyring %s\n", source); +} + +/* + * Try to load the MokListTrustedRT MOK variable to see if we should trust + * the MOK keys within the kernel. It is not an error if this variable + * does not exist. If it does not exist, MOK keys should not be trusted + * within the machine keyring. + */ +static __init bool uefi_check_trust_mok_keys(void) +{ + struct efi_mokvar_table_entry *mokvar_entry; + + mokvar_entry = efi_mokvar_entry_find("MokListTrustedRT"); + + if (mokvar_entry) + return true; + + return false; +} + +bool __init trust_moklist(void) +{ + static bool initialized; + + if (!initialized) { + initialized = true; + + if (uefi_check_trust_mok_keys()) + trust_mok = true; + } + + return trust_mok; +} |