summaryrefslogtreecommitdiffstats
path: root/security/integrity/evm/evm_main.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--security/integrity/evm/evm_main.c919
1 files changed, 919 insertions, 0 deletions
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
new file mode 100644
index 000000000..a338f1944
--- /dev/null
+++ b/security/integrity/evm/evm_main.c
@@ -0,0 +1,919 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2005-2010 IBM Corporation
+ *
+ * Author:
+ * Mimi Zohar <zohar@us.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * File: evm_main.c
+ * implements evm_inode_setxattr, evm_inode_post_setxattr,
+ * evm_inode_removexattr, and evm_verifyxattr
+ */
+
+#define pr_fmt(fmt) "EVM: "fmt
+
+#include <linux/init.h>
+#include <linux/crypto.h>
+#include <linux/audit.h>
+#include <linux/xattr.h>
+#include <linux/integrity.h>
+#include <linux/evm.h>
+#include <linux/magic.h>
+#include <linux/posix_acl_xattr.h>
+
+#include <crypto/hash.h>
+#include <crypto/hash_info.h>
+#include <crypto/algapi.h>
+#include "evm.h"
+
+int evm_initialized;
+
+static const char * const integrity_status_msg[] = {
+ "pass", "pass_immutable", "fail", "fail_immutable", "no_label",
+ "no_xattrs", "unknown"
+};
+int evm_hmac_attrs;
+
+static struct xattr_list evm_config_default_xattrnames[] = {
+ {
+ .name = XATTR_NAME_SELINUX,
+ .enabled = IS_ENABLED(CONFIG_SECURITY_SELINUX)
+ },
+ {
+ .name = XATTR_NAME_SMACK,
+ .enabled = IS_ENABLED(CONFIG_SECURITY_SMACK)
+ },
+ {
+ .name = XATTR_NAME_SMACKEXEC,
+ .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS)
+ },
+ {
+ .name = XATTR_NAME_SMACKTRANSMUTE,
+ .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS)
+ },
+ {
+ .name = XATTR_NAME_SMACKMMAP,
+ .enabled = IS_ENABLED(CONFIG_EVM_EXTRA_SMACK_XATTRS)
+ },
+ {
+ .name = XATTR_NAME_APPARMOR,
+ .enabled = IS_ENABLED(CONFIG_SECURITY_APPARMOR)
+ },
+ {
+ .name = XATTR_NAME_IMA,
+ .enabled = IS_ENABLED(CONFIG_IMA_APPRAISE)
+ },
+ {
+ .name = XATTR_NAME_CAPS,
+ .enabled = true
+ },
+};
+
+LIST_HEAD(evm_config_xattrnames);
+
+static int evm_fixmode __ro_after_init;
+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 1;
+}
+__setup("evm=", evm_set_fixmode);
+
+static void __init evm_init_config(void)
+{
+ int i, xattrs;
+
+ xattrs = ARRAY_SIZE(evm_config_default_xattrnames);
+
+ pr_info("Initialising EVM extended attributes:\n");
+ for (i = 0; i < xattrs; i++) {
+ pr_info("%s%s\n", evm_config_default_xattrnames[i].name,
+ !evm_config_default_xattrnames[i].enabled ?
+ " (disabled)" : "");
+ list_add_tail(&evm_config_default_xattrnames[i].list,
+ &evm_config_xattrnames);
+ }
+
+#ifdef CONFIG_EVM_ATTR_FSUUID
+ evm_hmac_attrs |= EVM_ATTR_FSUUID;
+#endif
+ pr_info("HMAC attrs: 0x%x\n", evm_hmac_attrs);
+}
+
+static bool evm_key_loaded(void)
+{
+ return (bool)(evm_initialized & EVM_KEY_MASK);
+}
+
+/*
+ * This function determines whether or not it is safe to ignore verification
+ * errors, based on the ability of EVM to calculate HMACs. If the HMAC key
+ * is not loaded, and it cannot be loaded in the future due to the
+ * EVM_SETUP_COMPLETE initialization flag, allowing an operation despite the
+ * attrs/xattrs being found invalid will not make them valid.
+ */
+static bool evm_hmac_disabled(void)
+{
+ if (evm_initialized & EVM_INIT_HMAC)
+ return false;
+
+ if (!(evm_initialized & EVM_SETUP_COMPLETE))
+ return false;
+
+ return true;
+}
+
+static int evm_find_protected_xattrs(struct dentry *dentry)
+{
+ struct inode *inode = d_backing_inode(dentry);
+ struct xattr_list *xattr;
+ int error;
+ int count = 0;
+
+ if (!(inode->i_opflags & IOP_XATTR))
+ return -EOPNOTSUPP;
+
+ list_for_each_entry_lockless(xattr, &evm_config_xattrnames, list) {
+ error = __vfs_getxattr(dentry, inode, xattr->name, NULL, 0);
+ if (error < 0) {
+ if (error == -ENODATA)
+ continue;
+ return error;
+ }
+ count++;
+ }
+
+ return count;
+}
+
+/*
+ * evm_verify_hmac - calculate and compare the HMAC with the EVM xattr
+ *
+ * Compute the HMAC on the dentry's protected set of extended attributes
+ * and compare it against the stored security.evm xattr.
+ *
+ * For performance:
+ * - use the previoulsy retrieved xattr value and length to calculate the
+ * HMAC.)
+ * - cache the verification result in the iint, when available.
+ *
+ * Returns integrity status
+ */
+static enum integrity_status evm_verify_hmac(struct dentry *dentry,
+ const char *xattr_name,
+ char *xattr_value,
+ size_t xattr_value_len,
+ struct integrity_iint_cache *iint)
+{
+ struct evm_ima_xattr_data *xattr_data = NULL;
+ struct signature_v2_hdr *hdr;
+ enum integrity_status evm_status = INTEGRITY_PASS;
+ struct evm_digest digest;
+ struct inode *inode;
+ int rc, xattr_len, evm_immutable = 0;
+
+ if (iint && (iint->evm_status == INTEGRITY_PASS ||
+ iint->evm_status == INTEGRITY_PASS_IMMUTABLE))
+ return iint->evm_status;
+
+ /* if status is not PASS, try to check again - against -ENOMEM */
+
+ /* first need to know the sig type */
+ rc = vfs_getxattr_alloc(&init_user_ns, dentry, XATTR_NAME_EVM,
+ (char **)&xattr_data, 0, GFP_NOFS);
+ if (rc <= 0) {
+ evm_status = INTEGRITY_FAIL;
+ if (rc == -ENODATA) {
+ rc = evm_find_protected_xattrs(dentry);
+ if (rc > 0)
+ evm_status = INTEGRITY_NOLABEL;
+ else if (rc == 0)
+ evm_status = INTEGRITY_NOXATTRS; /* new file */
+ } else if (rc == -EOPNOTSUPP) {
+ evm_status = INTEGRITY_UNKNOWN;
+ }
+ goto out;
+ }
+
+ xattr_len = rc;
+
+ /* check value type */
+ switch (xattr_data->type) {
+ case EVM_XATTR_HMAC:
+ 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_XATTR_PORTABLE_DIGSIG:
+ evm_immutable = 1;
+ fallthrough;
+ case EVM_IMA_XATTR_DIGSIG:
+ /* accept xattr with non-empty signature field */
+ if (xattr_len <= sizeof(struct signature_v2_hdr)) {
+ evm_status = INTEGRITY_FAIL;
+ goto out;
+ }
+
+ hdr = (struct signature_v2_hdr *)xattr_data;
+ digest.hdr.algo = hdr->hash_algo;
+ rc = evm_calc_hash(dentry, xattr_name, xattr_value,
+ xattr_value_len, xattr_data->type, &digest);
+ if (rc)
+ break;
+ rc = integrity_digsig_verify(INTEGRITY_KEYRING_EVM,
+ (const char *)xattr_data, xattr_len,
+ digest.digest, digest.hdr.length);
+ if (!rc) {
+ inode = d_backing_inode(dentry);
+
+ if (xattr_data->type == EVM_XATTR_PORTABLE_DIGSIG) {
+ if (iint)
+ iint->flags |= EVM_IMMUTABLE_DIGSIG;
+ evm_status = INTEGRITY_PASS_IMMUTABLE;
+ } else if (!IS_RDONLY(inode) &&
+ !(inode->i_sb->s_readonly_remount) &&
+ !IS_IMMUTABLE(inode)) {
+ evm_update_evmxattr(dentry, xattr_name,
+ xattr_value,
+ xattr_value_len);
+ }
+ }
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+ if (rc) {
+ if (rc == -ENODATA)
+ evm_status = INTEGRITY_NOXATTRS;
+ else if (evm_immutable)
+ evm_status = INTEGRITY_FAIL_IMMUTABLE;
+ else
+ evm_status = INTEGRITY_FAIL;
+ }
+ pr_debug("digest: (%d) [%*phN]\n", digest.hdr.length, digest.hdr.length,
+ digest.digest);
+out:
+ if (iint)
+ iint->evm_status = evm_status;
+ kfree(xattr_data);
+ return evm_status;
+}
+
+static int evm_protected_xattr_common(const char *req_xattr_name,
+ bool all_xattrs)
+{
+ int namelen;
+ int found = 0;
+ struct xattr_list *xattr;
+
+ namelen = strlen(req_xattr_name);
+ list_for_each_entry_lockless(xattr, &evm_config_xattrnames, list) {
+ if (!all_xattrs && !xattr->enabled)
+ continue;
+
+ if ((strlen(xattr->name) == namelen)
+ && (strncmp(req_xattr_name, xattr->name, namelen) == 0)) {
+ found = 1;
+ break;
+ }
+ if (strncmp(req_xattr_name,
+ xattr->name + XATTR_SECURITY_PREFIX_LEN,
+ strlen(req_xattr_name)) == 0) {
+ found = 1;
+ break;
+ }
+ }
+
+ return found;
+}
+
+static int evm_protected_xattr(const char *req_xattr_name)
+{
+ return evm_protected_xattr_common(req_xattr_name, false);
+}
+
+int evm_protected_xattr_if_enabled(const char *req_xattr_name)
+{
+ return evm_protected_xattr_common(req_xattr_name, true);
+}
+
+/**
+ * evm_read_protected_xattrs - read EVM protected xattr names, lengths, values
+ * @dentry: dentry of the read xattrs
+ * @buffer: buffer xattr names, lengths or values are copied to
+ * @buffer_size: size of buffer
+ * @type: n: names, l: lengths, v: values
+ * @canonical_fmt: data format (true: little endian, false: native format)
+ *
+ * Read protected xattr names (separated by |), lengths (u32) or values for a
+ * given dentry and return the total size of copied data. If buffer is NULL,
+ * just return the total size.
+ *
+ * Returns the total size on success, a negative value on error.
+ */
+int evm_read_protected_xattrs(struct dentry *dentry, u8 *buffer,
+ int buffer_size, char type, bool canonical_fmt)
+{
+ struct xattr_list *xattr;
+ int rc, size, total_size = 0;
+
+ list_for_each_entry_lockless(xattr, &evm_config_xattrnames, list) {
+ rc = __vfs_getxattr(dentry, d_backing_inode(dentry),
+ xattr->name, NULL, 0);
+ if (rc < 0 && rc == -ENODATA)
+ continue;
+ else if (rc < 0)
+ return rc;
+
+ switch (type) {
+ case 'n':
+ size = strlen(xattr->name) + 1;
+ if (buffer) {
+ if (total_size)
+ *(buffer + total_size - 1) = '|';
+
+ memcpy(buffer + total_size, xattr->name, size);
+ }
+ break;
+ case 'l':
+ size = sizeof(u32);
+ if (buffer) {
+ if (canonical_fmt)
+ rc = (__force int)cpu_to_le32(rc);
+
+ *(u32 *)(buffer + total_size) = rc;
+ }
+ break;
+ case 'v':
+ size = rc;
+ if (buffer) {
+ rc = __vfs_getxattr(dentry,
+ d_backing_inode(dentry), xattr->name,
+ buffer + total_size,
+ buffer_size - total_size);
+ if (rc < 0)
+ return rc;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ total_size += size;
+ }
+
+ return total_size;
+}
+
+/**
+ * evm_verifyxattr - verify the integrity of the requested xattr
+ * @dentry: object of the verify xattr
+ * @xattr_name: requested xattr
+ * @xattr_value: requested xattr value
+ * @xattr_value_len: requested xattr value length
+ * @iint: inode integrity metadata
+ *
+ * Calculate the HMAC for the given dentry and verify it against the stored
+ * security.evm xattr. For performance, use the xattr value and length
+ * previously retrieved to calculate the HMAC.
+ *
+ * Returns the xattr integrity status.
+ *
+ * This function requires the caller to lock the inode's i_mutex before it
+ * is executed.
+ */
+enum integrity_status evm_verifyxattr(struct dentry *dentry,
+ const char *xattr_name,
+ void *xattr_value, size_t xattr_value_len,
+ struct integrity_iint_cache *iint)
+{
+ if (!evm_key_loaded() || !evm_protected_xattr(xattr_name))
+ return INTEGRITY_UNKNOWN;
+
+ if (!iint) {
+ iint = integrity_iint_find(d_backing_inode(dentry));
+ if (!iint)
+ return INTEGRITY_UNKNOWN;
+ }
+ return evm_verify_hmac(dentry, xattr_name, xattr_value,
+ xattr_value_len, iint);
+}
+EXPORT_SYMBOL_GPL(evm_verifyxattr);
+
+/*
+ * evm_verify_current_integrity - verify the dentry's metadata integrity
+ * @dentry: pointer to the affected dentry
+ *
+ * Verify and return the dentry's metadata integrity. The exceptions are
+ * before EVM is initialized or in 'fix' mode.
+ */
+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 INTEGRITY_PASS;
+ return evm_verify_hmac(dentry, NULL, NULL, 0, NULL);
+}
+
+/*
+ * evm_xattr_acl_change - check if passed ACL changes the inode mode
+ * @mnt_userns: user namespace of the idmapped mount
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: requested xattr
+ * @xattr_value: requested xattr value
+ * @xattr_value_len: requested xattr value length
+ *
+ * Check if passed ACL changes the inode mode, which is protected by EVM.
+ *
+ * Returns 1 if passed ACL causes inode mode change, 0 otherwise.
+ */
+static int evm_xattr_acl_change(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *xattr_name,
+ const void *xattr_value, size_t xattr_value_len)
+{
+#ifdef CONFIG_FS_POSIX_ACL
+ umode_t mode;
+ struct posix_acl *acl = NULL, *acl_res;
+ struct inode *inode = d_backing_inode(dentry);
+ int rc;
+
+ /*
+ * 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 = vfs_set_acl_prepare(mnt_userns, i_user_ns(inode),
+ xattr_value, xattr_value_len);
+ if (IS_ERR_OR_NULL(acl))
+ return 1;
+
+ acl_res = acl;
+ /*
+ * Passing mnt_userns is necessary to correctly determine the GID in
+ * an idmapped mount, as the GID is used to clear the setgid bit in
+ * the inode mode.
+ */
+ rc = posix_acl_update_mode(mnt_userns, inode, &mode, &acl_res);
+
+ posix_acl_release(acl);
+
+ if (rc)
+ return 1;
+
+ if (inode->i_mode != mode)
+ return 1;
+#endif
+ return 0;
+}
+
+/*
+ * evm_xattr_change - check if passed xattr value differs from current value
+ * @mnt_userns: user namespace of the idmapped mount
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: requested xattr
+ * @xattr_value: requested xattr value
+ * @xattr_value_len: requested xattr value length
+ *
+ * Check if passed xattr value differs from current value.
+ *
+ * Returns 1 if passed xattr value differs from current value, 0 otherwise.
+ */
+static int evm_xattr_change(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *xattr_name,
+ const void *xattr_value, size_t xattr_value_len)
+{
+ char *xattr_data = NULL;
+ int rc = 0;
+
+ if (posix_xattr_acl(xattr_name))
+ return evm_xattr_acl_change(mnt_userns, dentry, xattr_name,
+ xattr_value, xattr_value_len);
+
+ rc = vfs_getxattr_alloc(&init_user_ns, dentry, xattr_name, &xattr_data,
+ 0, GFP_NOFS);
+ if (rc < 0)
+ return 1;
+
+ if (rc == xattr_value_len)
+ rc = !!memcmp(xattr_value, xattr_data, rc);
+ else
+ rc = 1;
+
+ kfree(xattr_data);
+ return rc;
+}
+
+/*
+ * evm_protect_xattr - protect the EVM extended attribute
+ *
+ * Prevent security.evm from being modified or removed without the
+ * necessary permissions or when the existing value is invalid.
+ *
+ * The posix xattr acls are 'system' prefixed, which normally would not
+ * affect security.evm. An interesting side affect of writing posix xattr
+ * acls is their modifying of the i_mode, which is included in security.evm.
+ * For posix xattr acls only, permit security.evm, even if it currently
+ * doesn't exist, to be updated unless the EVM signature is immutable.
+ */
+static int evm_protect_xattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *xattr_name,
+ const void *xattr_value, size_t xattr_value_len)
+{
+ enum integrity_status evm_status;
+
+ if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ } else if (!evm_protected_xattr(xattr_name)) {
+ if (!posix_xattr_acl(xattr_name))
+ return 0;
+ evm_status = evm_verify_current_integrity(dentry);
+ if ((evm_status == INTEGRITY_PASS) ||
+ (evm_status == INTEGRITY_NOXATTRS))
+ return 0;
+ goto out;
+ }
+
+ evm_status = evm_verify_current_integrity(dentry);
+ if (evm_status == INTEGRITY_NOXATTRS) {
+ struct integrity_iint_cache *iint;
+
+ /* Exception if the HMAC is not going to be calculated. */
+ if (evm_hmac_disabled())
+ return 0;
+
+ iint = integrity_iint_find(d_backing_inode(dentry));
+ if (iint && (iint->flags & IMA_NEW_FILE))
+ return 0;
+
+ /* exception for pseudo filesystems */
+ if (dentry->d_sb->s_magic == TMPFS_MAGIC
+ || dentry->d_sb->s_magic == SYSFS_MAGIC)
+ return 0;
+
+ integrity_audit_msg(AUDIT_INTEGRITY_METADATA,
+ dentry->d_inode, dentry->d_name.name,
+ "update_metadata",
+ integrity_status_msg[evm_status],
+ -EPERM, 0);
+ }
+out:
+ /* Exception if the HMAC is not going to be calculated. */
+ if (evm_hmac_disabled() && (evm_status == INTEGRITY_NOLABEL ||
+ evm_status == INTEGRITY_UNKNOWN))
+ return 0;
+
+ /*
+ * Writing other xattrs is safe for portable signatures, as portable
+ * signatures are immutable and can never be updated.
+ */
+ if (evm_status == INTEGRITY_FAIL_IMMUTABLE)
+ return 0;
+
+ if (evm_status == INTEGRITY_PASS_IMMUTABLE &&
+ !evm_xattr_change(mnt_userns, dentry, xattr_name, xattr_value,
+ xattr_value_len))
+ return 0;
+
+ if (evm_status != INTEGRITY_PASS &&
+ evm_status != INTEGRITY_PASS_IMMUTABLE)
+ integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
+ dentry->d_name.name, "appraise_metadata",
+ integrity_status_msg[evm_status],
+ -EPERM, 0);
+ return evm_status == INTEGRITY_PASS ? 0 : -EPERM;
+}
+
+/**
+ * evm_inode_setxattr - protect the EVM extended attribute
+ * @mnt_userns: user namespace of the idmapped mount
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ * @xattr_value: pointer to the new extended attribute value
+ * @xattr_value_len: pointer to the new extended attribute value length
+ *
+ * Before allowing the 'security.evm' protected xattr to be updated,
+ * verify the existing value is valid. As only the kernel should have
+ * access to the EVM encrypted key needed to calculate the HMAC, prevent
+ * userspace from writing HMAC value. Writing 'security.evm' requires
+ * requires CAP_SYS_ADMIN privileges.
+ */
+int evm_inode_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+ const char *xattr_name, const void *xattr_value,
+ size_t xattr_value_len)
+{
+ const struct evm_ima_xattr_data *xattr_data = xattr_value;
+
+ /* Policy permits modification of the protected xattrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
+ if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
+ if (!xattr_value_len)
+ return -EINVAL;
+ if (xattr_data->type != EVM_IMA_XATTR_DIGSIG &&
+ xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG)
+ return -EPERM;
+ }
+ return evm_protect_xattr(mnt_userns, dentry, xattr_name, xattr_value,
+ xattr_value_len);
+}
+
+/**
+ * evm_inode_removexattr - protect the EVM extended attribute
+ * @mnt_userns: user namespace of the idmapped mount
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ *
+ * Removing 'security.evm' requires CAP_SYS_ADMIN privileges and that
+ * the current value is valid.
+ */
+int evm_inode_removexattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *xattr_name)
+{
+ /* Policy permits modification of the protected xattrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
+ return evm_protect_xattr(mnt_userns, dentry, xattr_name, NULL, 0);
+}
+
+static void evm_reset_status(struct inode *inode)
+{
+ struct integrity_iint_cache *iint;
+
+ iint = integrity_iint_find(inode);
+ if (iint)
+ iint->evm_status = INTEGRITY_UNKNOWN;
+}
+
+/**
+ * evm_revalidate_status - report whether EVM status re-validation is necessary
+ * @xattr_name: pointer to the affected extended attribute name
+ *
+ * Report whether callers of evm_verifyxattr() should re-validate the
+ * EVM status.
+ *
+ * Return true if re-validation is necessary, false otherwise.
+ */
+bool evm_revalidate_status(const char *xattr_name)
+{
+ if (!evm_key_loaded())
+ return false;
+
+ /* evm_inode_post_setattr() passes NULL */
+ if (!xattr_name)
+ return true;
+
+ if (!evm_protected_xattr(xattr_name) && !posix_xattr_acl(xattr_name) &&
+ strcmp(xattr_name, XATTR_NAME_EVM))
+ return false;
+
+ return true;
+}
+
+/**
+ * evm_inode_post_setxattr - update 'security.evm' to reflect the changes
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ * @xattr_value: pointer to the new extended attribute value
+ * @xattr_value_len: pointer to the new extended attribute value length
+ *
+ * Update the HMAC stored in 'security.evm' to reflect the change.
+ *
+ * No need to take the i_mutex lock here, as this function is called from
+ * __vfs_setxattr_noperm(). The caller of which has taken the inode's
+ * i_mutex lock.
+ */
+void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
+ const void *xattr_value, size_t xattr_value_len)
+{
+ if (!evm_revalidate_status(xattr_name))
+ return;
+
+ evm_reset_status(dentry->d_inode);
+
+ if (!strcmp(xattr_name, XATTR_NAME_EVM))
+ return;
+
+ if (!(evm_initialized & EVM_INIT_HMAC))
+ return;
+
+ evm_update_evmxattr(dentry, xattr_name, xattr_value, xattr_value_len);
+}
+
+/**
+ * evm_inode_post_removexattr - update 'security.evm' after removing the xattr
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ *
+ * Update the HMAC stored in 'security.evm' to reflect removal of the xattr.
+ *
+ * No need to take the i_mutex lock here, as this function is called from
+ * vfs_removexattr() which takes the i_mutex.
+ */
+void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name)
+{
+ if (!evm_revalidate_status(xattr_name))
+ return;
+
+ evm_reset_status(dentry->d_inode);
+
+ if (!strcmp(xattr_name, XATTR_NAME_EVM))
+ return;
+
+ if (!(evm_initialized & EVM_INIT_HMAC))
+ return;
+
+ evm_update_evmxattr(dentry, xattr_name, NULL, 0);
+}
+
+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 (!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;
+
+ return 1;
+}
+
+/**
+ * evm_inode_setattr - prevent updating an invalid EVM extended attribute
+ * @idmap: idmap of the mount
+ * @dentry: pointer to the affected dentry
+ * @attr: iattr structure containing the new file attributes
+ *
+ * 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 user_namespace *mnt_userns, struct dentry *dentry,
+ struct iattr *attr)
+{
+ unsigned int ia_valid = attr->ia_valid;
+ enum integrity_status evm_status;
+
+ /* Policy permits modification of the protected attrs even though
+ * there's no HMAC key loaded
+ */
+ if (evm_initialized & EVM_ALLOW_METADATA_WRITES)
+ return 0;
+
+ if (!(ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)))
+ return 0;
+ evm_status = evm_verify_current_integrity(dentry);
+ /*
+ * Writing attrs is safe for portable signatures, as portable signatures
+ * are immutable and can never be updated.
+ */
+ if ((evm_status == INTEGRITY_PASS) ||
+ (evm_status == INTEGRITY_NOXATTRS) ||
+ (evm_status == INTEGRITY_FAIL_IMMUTABLE) ||
+ (evm_hmac_disabled() && (evm_status == INTEGRITY_NOLABEL ||
+ evm_status == INTEGRITY_UNKNOWN)))
+ return 0;
+
+ if (evm_status == INTEGRITY_PASS_IMMUTABLE &&
+ !evm_attr_change(mnt_userns, dentry, attr))
+ return 0;
+
+ integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
+ dentry->d_name.name, "appraise_metadata",
+ integrity_status_msg[evm_status], -EPERM, 0);
+ return -EPERM;
+}
+
+/**
+ * evm_inode_post_setattr - update 'security.evm' after modifying metadata
+ * @dentry: pointer to the affected dentry
+ * @ia_valid: for the UID and GID status
+ *
+ * For now, update the HMAC stored in 'security.evm' to reflect UID/GID
+ * changes.
+ *
+ * This function is called from notify_change(), which expects the caller
+ * to lock the inode's i_mutex.
+ */
+void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+{
+ if (!evm_revalidate_status(NULL))
+ return;
+
+ evm_reset_status(dentry->d_inode);
+
+ if (!(evm_initialized & EVM_INIT_HMAC))
+ return;
+
+ if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
+ evm_update_evmxattr(dentry, NULL, NULL, 0);
+}
+
+/*
+ * evm_inode_init_security - initializes security.evm HMAC value
+ */
+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_initialized & EVM_INIT_HMAC) ||
+ !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;
+}
+EXPORT_SYMBOL_GPL(evm_inode_init_security);
+
+#ifdef CONFIG_EVM_LOAD_X509
+void __init evm_load_x509(void)
+{
+ int rc;
+
+ rc = integrity_load_x509(INTEGRITY_KEYRING_EVM, CONFIG_EVM_X509_PATH);
+ if (!rc)
+ evm_initialized |= EVM_INIT_X509;
+}
+#endif
+
+static int __init init_evm(void)
+{
+ int error;
+ struct list_head *pos, *q;
+
+ evm_init_config();
+
+ error = integrity_init_keyring(INTEGRITY_KEYRING_EVM);
+ if (error)
+ goto error;
+
+ error = evm_init_secfs();
+ if (error < 0) {
+ pr_info("Error registering secfs\n");
+ goto error;
+ }
+
+error:
+ if (error != 0) {
+ if (!list_empty(&evm_config_xattrnames)) {
+ list_for_each_safe(pos, q, &evm_config_xattrnames)
+ list_del(pos);
+ }
+ }
+
+ return error;
+}
+
+late_initcall(init_evm);