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certs/system_keyring.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* System trusted keyring for trusted public keys * * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) |
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*/ #include <linux/export.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/cred.h> #include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/verification.h> |
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#include <keys/asymmetric-type.h> #include <keys/system_keyring.h> |
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#include <crypto/pkcs7.h> |
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static struct key *builtin_trusted_keys; #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING static struct key *secondary_trusted_keys; #endif |
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#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING static struct key *platform_trusted_keys; #endif |
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extern __initconst const u8 system_certificate_list[]; |
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extern __initconst const unsigned long system_certificate_list_size; |
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/** |
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* restrict_link_to_builtin_trusted - Restrict keyring addition by built in CA |
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* * Restrict the addition of keys into a keyring based on the key-to-be-added |
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* being vouched for by a key in the built in system keyring. |
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*/ |
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int restrict_link_by_builtin_trusted(struct key *dest_keyring, |
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const struct key_type *type, |
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const union key_payload *payload, struct key *restriction_key) |
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{ |
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return restrict_link_by_signature(dest_keyring, type, payload, builtin_trusted_keys); |
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} |
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#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING /** * restrict_link_by_builtin_and_secondary_trusted - Restrict keyring * addition by both builtin and secondary keyrings * * Restrict the addition of keys into a keyring based on the key-to-be-added * being vouched for by a key in either the built-in or the secondary system * keyrings. */ int restrict_link_by_builtin_and_secondary_trusted( |
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struct key *dest_keyring, |
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const struct key_type *type, |
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const union key_payload *payload, struct key *restrict_key) |
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{ /* If we have a secondary trusted keyring, then that contains a link * through to the builtin keyring and the search will follow that link. */ if (type == &key_type_keyring && |
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dest_keyring == secondary_trusted_keys && |
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payload == &builtin_trusted_keys->payload) /* Allow the builtin keyring to be added to the secondary */ return 0; |
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return restrict_link_by_signature(dest_keyring, type, payload, secondary_trusted_keys); |
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} |
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/** * Allocate a struct key_restriction for the "builtin and secondary trust" * keyring. Only for use in system_trusted_keyring_init(). */ static __init struct key_restriction *get_builtin_and_secondary_restriction(void) { struct key_restriction *restriction; restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); if (!restriction) panic("Can't allocate secondary trusted keyring restriction "); restriction->check = restrict_link_by_builtin_and_secondary_trusted; return restriction; } |
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#endif |
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/* |
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* Create the trusted keyrings |
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*/ static __init int system_trusted_keyring_init(void) { |
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pr_notice("Initialise system trusted keyrings "); |
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builtin_trusted_keys = keyring_alloc(".builtin_trusted_keys", |
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KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), |
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((KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH), KEY_ALLOC_NOT_IN_QUOTA, |
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NULL, NULL); if (IS_ERR(builtin_trusted_keys)) panic("Can't allocate builtin trusted keyring "); #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING secondary_trusted_keys = keyring_alloc(".secondary_trusted_keys", KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), |
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((KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH | KEY_USR_WRITE), KEY_ALLOC_NOT_IN_QUOTA, |
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get_builtin_and_secondary_restriction(), |
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NULL); if (IS_ERR(secondary_trusted_keys)) panic("Can't allocate secondary trusted keyring "); if (key_link(secondary_trusted_keys, builtin_trusted_keys) < 0) panic("Can't link trusted keyrings "); #endif |
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return 0; } /* * Must be initialised before we try and load the keys into the keyring. */ device_initcall(system_trusted_keyring_init); /* * Load the compiled-in list of X.509 certificates. */ static __init int load_system_certificate_list(void) { key_ref_t key; const u8 *p, *end; size_t plen; pr_notice("Loading compiled-in X.509 certificates "); |
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p = system_certificate_list; |
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end = p + system_certificate_list_size; |
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while (p < end) { /* Each cert begins with an ASN.1 SEQUENCE tag and must be more * than 256 bytes in size. */ if (end - p < 4) goto dodgy_cert; if (p[0] != 0x30 && p[1] != 0x82) goto dodgy_cert; plen = (p[2] << 8) | p[3]; plen += 4; if (plen > end - p) goto dodgy_cert; |
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key = key_create_or_update(make_key_ref(builtin_trusted_keys, 1), |
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"asymmetric", NULL, p, plen, |
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((KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ), |
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KEY_ALLOC_NOT_IN_QUOTA | |
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KEY_ALLOC_BUILT_IN | KEY_ALLOC_BYPASS_RESTRICTION); |
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if (IS_ERR(key)) { pr_err("Problem loading in-kernel X.509 certificate (%ld) ", PTR_ERR(key)); } else { pr_notice("Loaded X.509 cert '%s' ", key_ref_to_ptr(key)->description); key_ref_put(key); } p += plen; } return 0; dodgy_cert: pr_err("Problem parsing in-kernel X.509 certificate list "); return 0; } late_initcall(load_system_certificate_list); |
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#ifdef CONFIG_SYSTEM_DATA_VERIFICATION /** |
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* verify_pkcs7_message_sig - Verify a PKCS#7-based signature on system data. |
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* @data: The data to be verified (NULL if expecting internal data). |
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* @len: Size of @data. |
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* @pkcs7: The PKCS#7 message that is the signature. |
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* @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only, * (void *)1UL for all trusted keys). |
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* @usage: The use to which the key is being put. |
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* @view_content: Callback to gain access to content. * @ctx: Context for callback. |
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*/ |
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int verify_pkcs7_message_sig(const void *data, size_t len, struct pkcs7_message *pkcs7, struct key *trusted_keys, enum key_being_used_for usage, int (*view_content)(void *ctx, const void *data, size_t len, size_t asn1hdrlen), void *ctx) |
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{ |
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int ret; |
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/* The data should be detached - so we need to supply it. */ |
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if (data && pkcs7_supply_detached_data(pkcs7, data, len) < 0) { |
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pr_err("PKCS#7 signature with non-detached data "); ret = -EBADMSG; goto error; } |
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ret = pkcs7_verify(pkcs7, usage); |
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if (ret < 0) goto error; |
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if (!trusted_keys) { trusted_keys = builtin_trusted_keys; |
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} else if (trusted_keys == VERIFY_USE_SECONDARY_KEYRING) { |
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#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING trusted_keys = secondary_trusted_keys; #else trusted_keys = builtin_trusted_keys; #endif |
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} else if (trusted_keys == VERIFY_USE_PLATFORM_KEYRING) { #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING trusted_keys = platform_trusted_keys; #else trusted_keys = NULL; #endif if (!trusted_keys) { ret = -ENOKEY; pr_devel("PKCS#7 platform keyring is not available "); goto error; } |
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} |
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ret = pkcs7_validate_trust(pkcs7, trusted_keys); if (ret < 0) { if (ret == -ENOKEY) |
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pr_devel("PKCS#7 signature not signed with a trusted key "); |
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goto error; } if (view_content) { size_t asn1hdrlen; ret = pkcs7_get_content_data(pkcs7, &data, &len, &asn1hdrlen); if (ret < 0) { if (ret == -ENODATA) pr_devel("PKCS#7 message does not contain data "); goto error; } ret = view_content(ctx, data, len, asn1hdrlen); |
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} error: |
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pr_devel("<==%s() = %d ", __func__, ret); return ret; } /** * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data. * @data: The data to be verified (NULL if expecting internal data). * @len: Size of @data. * @raw_pkcs7: The PKCS#7 message that is the signature. * @pkcs7_len: The size of @raw_pkcs7. * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only, * (void *)1UL for all trusted keys). * @usage: The use to which the key is being put. * @view_content: Callback to gain access to content. * @ctx: Context for callback. */ int verify_pkcs7_signature(const void *data, size_t len, const void *raw_pkcs7, size_t pkcs7_len, struct key *trusted_keys, enum key_being_used_for usage, int (*view_content)(void *ctx, const void *data, size_t len, size_t asn1hdrlen), void *ctx) { struct pkcs7_message *pkcs7; int ret; pkcs7 = pkcs7_parse_message(raw_pkcs7, pkcs7_len); if (IS_ERR(pkcs7)) return PTR_ERR(pkcs7); ret = verify_pkcs7_message_sig(data, len, pkcs7, trusted_keys, usage, view_content, ctx); |
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pkcs7_free_message(pkcs7); pr_devel("<==%s() = %d ", __func__, ret); return ret; } |
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EXPORT_SYMBOL_GPL(verify_pkcs7_signature); |
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#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */ |
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#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING void __init set_platform_trusted_keys(struct key *keyring) { platform_trusted_keys = keyring; } #endif |