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160 lines
4.2 KiB
160 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2005,2006,2007,2008 IBM Corporation |
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* |
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* Authors: |
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* Reiner Sailer <[email protected]> |
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* Leendert van Doorn <[email protected]> |
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* Mimi Zohar <[email protected]> |
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* |
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* File: ima_init.c |
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* initialization and cleanup functions |
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*/ |
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#include <linux/init.h> |
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#include <linux/scatterlist.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/ima.h> |
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#include <generated/utsrelease.h> |
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#include "ima.h" |
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/* name for boot aggregate entry */ |
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const char boot_aggregate_name[] = "boot_aggregate"; |
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struct tpm_chip *ima_tpm_chip; |
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/* Add the boot aggregate to the IMA measurement list and extend |
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* the PCR register. |
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* |
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* Calculate the boot aggregate, a hash over tpm registers 0-7, |
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* assuming a TPM chip exists, and zeroes if the TPM chip does not |
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* exist. Add the boot aggregate measurement to the measurement |
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* list and extend the PCR register. |
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* |
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* If a tpm chip does not exist, indicate the core root of trust is |
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* not hardware based by invalidating the aggregate PCR value. |
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* (The aggregate PCR value is invalidated by adding one value to |
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* the measurement list and extending the aggregate PCR value with |
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* a different value.) Violations add a zero entry to the measurement |
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* list and extend the aggregate PCR value with ff...ff's. |
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*/ |
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static int __init ima_add_boot_aggregate(void) |
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{ |
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static const char op[] = "add_boot_aggregate"; |
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const char *audit_cause = "ENOMEM"; |
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struct ima_template_entry *entry; |
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struct integrity_iint_cache tmp_iint, *iint = &tmp_iint; |
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struct ima_event_data event_data = { .iint = iint, |
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.filename = boot_aggregate_name }; |
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int result = -ENOMEM; |
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int violation = 0; |
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struct { |
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struct ima_digest_data hdr; |
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char digest[TPM_MAX_DIGEST_SIZE]; |
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} hash; |
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memset(iint, 0, sizeof(*iint)); |
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memset(&hash, 0, sizeof(hash)); |
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iint->ima_hash = &hash.hdr; |
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iint->ima_hash->algo = ima_hash_algo; |
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iint->ima_hash->length = hash_digest_size[ima_hash_algo]; |
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/* |
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* With TPM 2.0 hash agility, TPM chips could support multiple TPM |
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* PCR banks, allowing firmware to configure and enable different |
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* banks. The SHA1 bank is not necessarily enabled. |
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* |
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* Use the same hash algorithm for reading the TPM PCRs as for |
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* calculating the boot aggregate digest. Preference is given to |
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* the configured IMA default hash algorithm. Otherwise, use the |
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* TCG required banks - SHA256 for TPM 2.0, SHA1 for TPM 1.2. |
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* Ultimately select SHA1 also for TPM 2.0 if the SHA256 PCR bank |
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* is not found. |
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*/ |
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if (ima_tpm_chip) { |
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result = ima_calc_boot_aggregate(&hash.hdr); |
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if (result < 0) { |
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audit_cause = "hashing_error"; |
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goto err_out; |
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} |
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} |
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result = ima_alloc_init_template(&event_data, &entry, NULL); |
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if (result < 0) { |
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audit_cause = "alloc_entry"; |
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goto err_out; |
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} |
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result = ima_store_template(entry, violation, NULL, |
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boot_aggregate_name, |
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CONFIG_IMA_MEASURE_PCR_IDX); |
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if (result < 0) { |
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ima_free_template_entry(entry); |
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audit_cause = "store_entry"; |
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goto err_out; |
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} |
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return 0; |
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err_out: |
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integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op, |
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audit_cause, result, 0); |
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return result; |
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} |
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#ifdef CONFIG_IMA_LOAD_X509 |
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void __init ima_load_x509(void) |
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{ |
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int unset_flags = ima_policy_flag & IMA_APPRAISE; |
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ima_policy_flag &= ~unset_flags; |
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integrity_load_x509(INTEGRITY_KEYRING_IMA, CONFIG_IMA_X509_PATH); |
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/* load also EVM key to avoid appraisal */ |
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evm_load_x509(); |
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ima_policy_flag |= unset_flags; |
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} |
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#endif |
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int __init ima_init(void) |
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{ |
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int rc; |
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ima_tpm_chip = tpm_default_chip(); |
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if (!ima_tpm_chip) |
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pr_info("No TPM chip found, activating TPM-bypass!\n"); |
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rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA); |
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if (rc) |
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return rc; |
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rc = ima_init_crypto(); |
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if (rc) |
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return rc; |
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rc = ima_init_template(); |
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if (rc != 0) |
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return rc; |
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/* It can be called before ima_init_digests(), it does not use TPM. */ |
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ima_load_kexec_buffer(); |
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rc = ima_init_digests(); |
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if (rc != 0) |
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return rc; |
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rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */ |
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if (rc != 0) |
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return rc; |
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ima_init_policy(); |
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rc = ima_fs_init(); |
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if (rc != 0) |
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return rc; |
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ima_init_key_queue(); |
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ima_measure_critical_data("kernel_info", "kernel_version", |
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UTS_RELEASE, strlen(UTS_RELEASE), false); |
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return rc; |
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}
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