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Create a static version in this case and return -EINVAL. Reported-by: kernel test robot Signed-off-by: Eric Snowberg Reviewed-by: Mimi Zohar Reviewed-by: Petr Vorel --- include/crypto/public_key.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index 68f7aa2a7e55..6d61695e1cde 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -80,7 +80,16 @@ extern int create_signature(struct kernel_pkey_params *, const void *, void *); extern int verify_signature(const struct key *, const struct public_key_signature *); +#if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) int public_key_verify_signature(const struct public_key *pkey, const struct public_key_signature *sig); +#else +static inline +int public_key_verify_signature(const struct public_key *pkey, + const struct public_key_signature *sig) +{ + return -EINVAL; +} +#endif #endif /* _LINUX_PUBLIC_KEY_H */ From patchwork Wed Dec 7 17:12:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067370 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2869CC47089 for ; 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Wed, 7 Dec 2022 17:12:44 +0000 From: Eric Snowberg To: jarkko@kernel.org, zohar@linux.ibm.com Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, noodles@fb.com, tiwai@suse.de, bp@suse.de, eric.snowberg@oracle.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, erpalmer@linux.vnet.ibm.com, coxu@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 02/10] KEYS: Add missing function documentation Date: Wed, 7 Dec 2022 12:12:30 -0500 Message-Id: <20221207171238.2945307-3-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20221207171238.2945307-1-eric.snowberg@oracle.com> References: <20221207171238.2945307-1-eric.snowberg@oracle.com> X-ClientProxiedBy: SJ0PR03CA0073.namprd03.prod.outlook.com (2603:10b6:a03:331::18) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4150:EE_|DS7PR10MB5293:EE_ X-MS-Office365-Filtering-Correlation-Id: e92b6910-e9cb-4858-a916-08dad876415d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Use /* instead of /** for get_builtin_and_secondary_restriction, since it is a static function. Signed-off-by: Eric Snowberg Reviewed-by: Petr Vorel --- certs/system_keyring.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 5042cc54fa5e..250148298690 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -33,7 +33,11 @@ extern __initconst const unsigned long system_certificate_list_size; extern __initconst const unsigned long module_cert_size; /** - * restrict_link_to_builtin_trusted - Restrict keyring addition by built in CA + * restrict_link_by_builtin_trusted - Restrict keyring addition by built in CA + * @dest_keyring: Keyring being linked to. + * @type: The type of key being added. + * @payload: The payload of the new key. + * @restriction_key: A ring of keys that can be used to vouch for the new cert. * * Restrict the addition of keys into a keyring based on the key-to-be-added * being vouched for by a key in the built in system keyring. @@ -51,6 +55,10 @@ int restrict_link_by_builtin_trusted(struct key *dest_keyring, /** * restrict_link_by_builtin_and_secondary_trusted - Restrict keyring * addition by both builtin and secondary keyrings + * @dest_keyring: Keyring being linked to. + * @type: The type of key being added. + * @payload: The payload of the new key. + * @restrict_key: A ring of keys that can be used to vouch for the new cert. * * 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 @@ -75,7 +83,7 @@ int restrict_link_by_builtin_and_secondary_trusted( secondary_trusted_keys); } -/** +/* * Allocate a struct key_restriction for the "builtin and secondary trust" * keyring. 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The basic constraints extension identifies whether the subject of the certificate is a CA. BasicConstraints ::= SEQUENCE { cA BOOLEAN DEFAULT FALSE, pathLenConstraint INTEGER (0..MAX) OPTIONAL } If the CA is true, store it in the x509_certificate. This will be used in a follow on patch that requires knowing if the public key is a CA. Signed-off-by: Eric Snowberg --- crypto/asymmetric_keys/x509_cert_parser.c | 9 +++++++++ crypto/asymmetric_keys/x509_parser.h | 1 + 2 files changed, 10 insertions(+) diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 7a9b084e2043..b4443e507153 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -586,6 +586,15 @@ int x509_process_extension(void *context, size_t hdrlen, return 0; } + if (ctx->last_oid == OID_basicConstraints) { + if (vlen < 2 || v[0] != (ASN1_CONS_BIT | ASN1_SEQ)) + return -EBADMSG; + if (v[1] != vlen - 2) + return -EBADMSG; + if (vlen >= 4 && v[1] != 0 && v[2] == ASN1_BOOL && v[3] == 1) + ctx->cert->root_ca = true; + } + return 0; } diff --git a/crypto/asymmetric_keys/x509_parser.h b/crypto/asymmetric_keys/x509_parser.h index a299c9c56f40..7c5c0ad1c22e 100644 --- a/crypto/asymmetric_keys/x509_parser.h +++ b/crypto/asymmetric_keys/x509_parser.h @@ -38,6 +38,7 @@ struct x509_certificate { bool self_signed; /* T if self-signed (check unsupported_sig too) */ bool unsupported_sig; /* T if signature uses unsupported crypto */ bool blacklisted; + bool root_ca; /* T if basic constraints CA is set */ }; /* From patchwork Wed Dec 7 17:12:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067377 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 603E5C63718 for ; Wed, 7 Dec 2022 17:13:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229785AbiLGRNl (ORCPT ); Wed, 7 Dec 2022 12:13:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229649AbiLGRNg (ORCPT ); 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The key usage extension defines the purpose of the key contained in the certificate. id-ce-keyUsage OBJECT IDENTIFIER ::= { id-ce 15 } KeyUsage ::= BIT STRING { digitalSignature (0), contentCommitment (1), keyEncipherment (2), dataEncipherment (3), keyAgreement (4), keyCertSign (5), cRLSign (6), encipherOnly (7), decipherOnly (8) } If the keyCertSign is set, store it in the x509_certificate structure. This will be used in a follow on patch that requires knowing the certificate key usage type. Signed-off-by: Eric Snowberg --- crypto/asymmetric_keys/x509_cert_parser.c | 22 ++++++++++++++++++++++ crypto/asymmetric_keys/x509_parser.h | 1 + 2 files changed, 23 insertions(+) diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index b4443e507153..edb22cf04eed 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -579,6 +579,28 @@ int x509_process_extension(void *context, size_t hdrlen, return 0; } + if (ctx->last_oid == OID_keyUsage) { + /* + * Get hold of the keyUsage bit string to validate keyCertSign + * v[1] is the encoding size + * (Expect either 0x02 or 0x03, making it 1 or 2 bytes) + * v[2] is the number of unused bits in the bit string + * (If >= 3 keyCertSign is missing) + * v[3] and possibly v[4] contain the bit string + * 0x04 is where KeyCertSign lands in this bit string (from + * RFC 5280 4.2.1.3) + */ + if (v[0] != ASN1_BTS) + return -EBADMSG; + if (vlen < 4) + return -EBADMSG; + if (v[1] == 0x02 && v[2] <= 2 && (v[3] & 0x04)) + ctx->cert->kcs_set = true; + else if (vlen > 4 && v[1] == 0x03 && (v[3] & 0x04)) + ctx->cert->kcs_set = true; + return 0; + } + if (ctx->last_oid == OID_authorityKeyIdentifier) { /* Get hold of the CA key fingerprint */ ctx->raw_akid = v; diff --git a/crypto/asymmetric_keys/x509_parser.h b/crypto/asymmetric_keys/x509_parser.h index 7c5c0ad1c22e..74a9f929e400 100644 --- a/crypto/asymmetric_keys/x509_parser.h +++ b/crypto/asymmetric_keys/x509_parser.h @@ -39,6 +39,7 @@ struct x509_certificate { bool unsupported_sig; /* T if signature uses unsupported crypto */ bool blacklisted; bool root_ca; /* T if basic constraints CA is set */ + bool kcs_set; /* T if keyCertSign is set */ }; /* From patchwork Wed Dec 7 17:12:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067371 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEA72C63709 for ; 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Wed, 7 Dec 2022 17:12:51 +0000 From: Eric Snowberg To: jarkko@kernel.org, zohar@linux.ibm.com Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, noodles@fb.com, tiwai@suse.de, bp@suse.de, eric.snowberg@oracle.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, erpalmer@linux.vnet.ibm.com, coxu@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 05/10] KEYS: Introduce a CA endorsed flag Date: Wed, 7 Dec 2022 12:12:33 -0500 Message-Id: <20221207171238.2945307-6-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20221207171238.2945307-1-eric.snowberg@oracle.com> References: <20221207171238.2945307-1-eric.snowberg@oracle.com> X-ClientProxiedBy: SJ0PR03CA0169.namprd03.prod.outlook.com (2603:10b6:a03:338::24) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4150:EE_|DS7PR10MB5293:EE_ X-MS-Office365-Filtering-Correlation-Id: 8c2fa197-eca9-457d-5cea-08dad87645dc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: h4pHHtBCMl+n2uIALQTsAbH1DrZllVm2MRYXu8MyrtBF3abeKRu/VwBblnM9Am3HAfw1BcvSX/9EYhusE29EmVaoAaInG1i1XqhHdUbaI3nah68fj+l+9xkL57HFJZINyZ/IUv1nxp7Ej+3qaSGbaww8x+s/S3+lKC0AVj1AF+tRiIKpAgbjPO/IpyOQAS4Ooz+sXeGDCOS8zGYij1a9n/b7IDQtEzUHVVKE25RMpCjUq2qRtylYUgy3OQx1kr8lfkuMA59tsrs4vpJI3XFdlUTQfB6GhILgkVveVnWxPGRnzAfjIhrnqOagRYR4I9l+x4aZg4BGkzvVgXlx7ajR22sX+OCBU1busOvlIDpX/2yO1VFYRCwiqQNztARyNU+jhUD2ZLisQezUSaSuWejQMFrghj9Uo9GaUylIYoaaBr2n9C4ttFWGC/LcIKnhN3LW4H2OGaesI9dfQVAox/9YRv2A9hejBHTBXQAZGYFuk925yoedDr1gcLQ0Dt6naR1GFsa/5kZapHj+CdVugl49bMxz8u6xrB3S56UKFtVOPDoA5GDDWWqGzbCkBdGNSkymcOn3N/UeX3/3BGlMYJMNGtxR7yAzty1T+tuSROIe9/ZaJDXt3zCNK/0qnWWRx5GpoADkHTbMm3yxP8c7F0N/ejxDXO2H5bO96Jib2PD4xJiVJJc3Scq3FwKRmJJQgZvC9c4DiQxI6rK8R5IoFomqVHSrmQxYv+cPs5ay1xuavE8Lof0WAtcwAyEEoprRD8rn1rSkhQZtOjHspQR5poeZN9YOKbn3X7yvoNxBMZSVI+4Mu8vwOIWy1YrS2D5I2MWD6JGFGjRZCae/PB8UKjWtIDrZz52TKp5S7k0OVHTibepEOgGAriGG98oYU4b3I1RCjJFWyzqnHnPgeP2E5jUvp47UpoHxh3a0emnUl1Ao6UeYVSJMmSQPt76Bg3QhvK/4cRnUcZqCIIPFJPxKh4dwBuR+W4VlmjrpkRbPmz6rPl6s8wu86fuUYOcwUzbfRCxt5K6XAdPMRx/dQE9U3TBbVsP2LKU0hnVufgF36JKNUYlfMwdj+L+BKOlcKB2LN0CTq4oMF4nhJ8qAbylPQGKAr7m4Kn+Iz2edPpyzMgmtzjoVf+gmFkdHucwVzp1FeYGwnlM9XtjLXEV27c5MkZM6+h7u5Y8Izqf0LwvyQxP3t5AimU4KhX4Ho3+H9sihWd6WvXRwXnoNQVXVvfv33nqqCqSG/+Qk6sQ11rPWWWK9zt35axvgtmNgrrOWhNNC8/5JKAAIsPppPX7ky3V1FBS7WHoLkZldHeN0ccdP8iaytD8eP2x9WwAfs+2+w+Dv943RhFeBxh0kVi80I+1G9pMla2Nmeez34sPFR1b5K0JV0415KF6ZWYRIlwxSmNIPuDId2EL4PDXj9Hh9E+RguerlCsRW9QGgTPqlkNVCqjbnbKyPoiEu7S4FwyO2pCYuGf6tpeDjhz9vvQcY4eWNFAvWYPbjUjmkbADhKrpvrYteNW27XxaOnLKi/lUGAEie+qbFmi5xLvm7VVKmlN+FYrf4lhZH2N0bLZvKaY2b78jajWN9AT08Aondrm8KTDzGN7rbn7Av+yzRkSXZ47qFmGTGhoYENYCPXwQbovULrqXOGCg= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8c2fa197-eca9-457d-5cea-08dad87645dc X-MS-Exchange-CrossTenant-AuthSource: CH2PR10MB4150.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2022 17:12:51.8031 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1el5TTVlOCxDLfUEkMy3FeBxHshvhrN4JLsdkYMDk6NL/sHlRTD377U0Q2SzK1U3NfzoAwB4ZWmLg4q1odO0FpcTU9sXe720FeB39HovP+I= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR10MB5293 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-07_08,2022-12-07_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 suspectscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 spamscore=0 adultscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212070150 X-Proofpoint-GUID: nZnh0RXHzviYsynWwcqRDvXI8c4gLx0l X-Proofpoint-ORIG-GUID: nZnh0RXHzviYsynWwcqRDvXI8c4gLx0l Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Some subsystems are interested in knowing if a key has been endorsed as a Certificate Authority (CA). From the data contained in struct key, it is not possible to make this determination after the key parsing is complete. Introduce a new Endorsed Certificate Authority flag called KEY_FLAG_ECA. The first type of key to use this is X.509. When a X.509 certificate is self signed, has the keyCertSign Key Usage set and contains the CA bit set, this new flag is set. In the future, other usage fields could be added as flags, i.e. digitialSignature. Signed-off-by: Eric Snowberg --- crypto/asymmetric_keys/x509_public_key.c | 3 +++ include/linux/key-type.h | 2 ++ include/linux/key.h | 2 ++ security/keys/key.c | 8 ++++++++ 4 files changed, 15 insertions(+) diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 0b4943a4592b..64cffedc4dd0 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -208,6 +208,9 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) goto error_free_kids; } + if (cert->kcs_set && cert->self_signed && cert->root_ca) + prep->payload_flags |= KEY_ALLOC_PECA; + /* We're pinning the module by being linked against it */ __module_get(public_key_subtype.owner); prep->payload.data[asym_subtype] = &public_key_subtype; diff --git a/include/linux/key-type.h b/include/linux/key-type.h index 7d985a1dfe4a..0b500578441c 100644 --- a/include/linux/key-type.h +++ b/include/linux/key-type.h @@ -36,6 +36,8 @@ struct key_preparsed_payload { size_t datalen; /* Raw datalen */ size_t quotalen; /* Quota length for proposed payload */ time64_t expiry; /* Expiry time of key */ + unsigned int payload_flags; /* Proposed payload flags */ +#define KEY_ALLOC_PECA 0x0001 /* Proposed Endorsed CA (ECA) key */ } __randomize_layout; typedef int (*request_key_actor_t)(struct key *auth_key, void *aux); diff --git a/include/linux/key.h b/include/linux/key.h index d27477faf00d..21d5a13ee4a9 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -236,6 +236,7 @@ struct key { #define KEY_FLAG_ROOT_CAN_INVAL 7 /* set if key can be invalidated by root without permission */ #define KEY_FLAG_KEEP 8 /* set if key should not be removed */ #define KEY_FLAG_UID_KEYRING 9 /* set if key is a user or user session keyring */ +#define KEY_FLAG_ECA 10 /* set if key is an Endorsed CA key */ /* the key type and key description string * - the desc is used to match a key against search criteria @@ -296,6 +297,7 @@ extern struct key *key_alloc(struct key_type *type, #define KEY_ALLOC_BYPASS_RESTRICTION 0x0008 /* Override the check on restricted keyrings */ #define KEY_ALLOC_UID_KEYRING 0x0010 /* allocating a user or user session keyring */ #define KEY_ALLOC_SET_KEEP 0x0020 /* Set the KEEP flag on the key/keyring */ +#define KEY_ALLOC_ECA 0x0040 /* Add Endorsed CA key */ extern void key_revoke(struct key *key); extern void key_invalidate(struct key *key); diff --git a/security/keys/key.c b/security/keys/key.c index c45afdd1dfbb..e6b4946aca70 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -305,6 +305,8 @@ struct key *key_alloc(struct key_type *type, const char *desc, key->flags |= 1 << KEY_FLAG_UID_KEYRING; if (flags & KEY_ALLOC_SET_KEEP) key->flags |= 1 << KEY_FLAG_KEEP; + if (flags & KEY_ALLOC_ECA) + key->flags |= 1 << KEY_FLAG_ECA; #ifdef KEY_DEBUGGING key->magic = KEY_DEBUG_MAGIC; @@ -929,6 +931,12 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, perm |= KEY_POS_WRITE; } + /* Only allow KEY_ALLOC_ECA flag to be set by preparser contents */ + if (prep.payload_flags & KEY_ALLOC_PECA) + flags |= KEY_ALLOC_ECA; + else + flags &= ~KEY_ALLOC_ECA; + /* allocate a new key */ key = key_alloc(index_key.type, index_key.description, cred->fsuid, cred->fsgid, cred, perm, flags, NULL); From patchwork Wed Dec 7 17:12:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067372 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF727C6370D for ; 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Wed, 7 Dec 2022 17:12:54 +0000 From: Eric Snowberg To: jarkko@kernel.org, zohar@linux.ibm.com Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, noodles@fb.com, tiwai@suse.de, bp@suse.de, eric.snowberg@oracle.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, erpalmer@linux.vnet.ibm.com, coxu@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 06/10] KEYS: Introduce keyring restriction that validates ca trust Date: Wed, 7 Dec 2022 12:12:34 -0500 Message-Id: <20221207171238.2945307-7-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20221207171238.2945307-1-eric.snowberg@oracle.com> References: <20221207171238.2945307-1-eric.snowberg@oracle.com> X-ClientProxiedBy: BYAPR03CA0014.namprd03.prod.outlook.com (2603:10b6:a02:a8::27) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4150:EE_|DS7PR10MB5293:EE_ X-MS-Office365-Filtering-Correlation-Id: a25617f4-0df0-47ee-4f9e-08dad87647a6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Add a new restriction called restrict_link_by_ca_and_signature that both vouches for the new key and validates the vouching key is an endorsed certificate authority. Two new system keyring restrictions are added to use restrict_link_by_ca_and_signature. The first restriction called restrict_link_by_ca_builtin_trusted uses the builtin_trusted_keys as the restricted keyring. The second system keyring restriction called restrict_link_by_ca_builtin_and_secondary_trusted uses the secondary_trusted_keys as the restricted keyring. Should the machine keyring be defined, it shall be validated too, since it is linked to the secondary_trusted_keys keyring. Signed-off-by: Eric Snowberg --- certs/system_keyring.c | 18 ++++++++++++++ crypto/asymmetric_keys/restrict.c | 41 +++++++++++++++++++++++++++++++ include/crypto/public_key.h | 5 ++++ include/keys/system_keyring.h | 12 ++++++++- 4 files changed, 75 insertions(+), 1 deletion(-) diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 250148298690..af5094ce9bcb 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -51,6 +51,14 @@ int restrict_link_by_builtin_trusted(struct key *dest_keyring, builtin_trusted_keys); } +int restrict_link_by_ca_builtin_trusted(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *unused) +{ + return restrict_link_by_ca_and_signature(dest_keyring, type, payload, + builtin_trusted_keys); +} #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING /** * restrict_link_by_builtin_and_secondary_trusted - Restrict keyring @@ -83,6 +91,16 @@ int restrict_link_by_builtin_and_secondary_trusted( secondary_trusted_keys); } +int restrict_link_by_ca_builtin_and_secondary_trusted( + struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *unused) +{ + return restrict_link_by_ca_and_signature(dest_keyring, type, payload, + secondary_trusted_keys); +} + /* * Allocate a struct key_restriction for the "builtin and secondary trust" * keyring. Only for use in system_trusted_keyring_init(). diff --git a/crypto/asymmetric_keys/restrict.c b/crypto/asymmetric_keys/restrict.c index 6b1ac5f5896a..005cb28969e4 100644 --- a/crypto/asymmetric_keys/restrict.c +++ b/crypto/asymmetric_keys/restrict.c @@ -108,6 +108,47 @@ int restrict_link_by_signature(struct key *dest_keyring, return ret; } +int restrict_link_by_ca_and_signature(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trust_keyring) +{ + const struct public_key_signature *sig; + struct key *key; + int ret; + + if (!trust_keyring) + return -ENOKEY; + + if (type != &key_type_asymmetric) + return -EOPNOTSUPP; + + sig = payload->data[asym_auth]; + if (!sig) + return -ENOPKG; + if (!sig->auth_ids[0] && !sig->auth_ids[1] && !sig->auth_ids[2]) + return -ENOKEY; + + if (ca_keyid && !asymmetric_key_id_partial(sig->auth_ids[1], ca_keyid)) + return -EPERM; + + /* See if we have a key that signed this one. */ + key = find_asymmetric_key(trust_keyring, + sig->auth_ids[0], sig->auth_ids[1], + sig->auth_ids[2], false); + if (IS_ERR(key)) + return -ENOKEY; + + if (!test_bit(KEY_FLAG_ECA, &key->flags)) + ret = -ENOKEY; + else if (use_builtin_keys && !test_bit(KEY_FLAG_BUILTIN, &key->flags)) + ret = -ENOKEY; + else + ret = verify_signature(key, sig); + key_put(key); + return ret; +} + static bool match_either_id(const struct asymmetric_key_id **pair, const struct asymmetric_key_id *single) { diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index 6d61695e1cde..e51bbc5ffe17 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -71,6 +71,11 @@ extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring, const union key_payload *payload, struct key *trusted); +extern int restrict_link_by_ca_and_signature(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *unused); + extern int query_asymmetric_key(const struct kernel_pkey_params *, struct kernel_pkey_query *); diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h index 91e080efb918..4e94bf72b998 100644 --- a/include/keys/system_keyring.h +++ b/include/keys/system_keyring.h @@ -24,9 +24,13 @@ extern int restrict_link_by_builtin_trusted(struct key *keyring, const union key_payload *payload, struct key *restriction_key); extern __init int load_module_cert(struct key *keyring); - +extern int restrict_link_by_ca_builtin_trusted(struct key *keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *unused); #else #define restrict_link_by_builtin_trusted restrict_link_reject +#define restrict_link_by_ca_builtin_trusted restrict_link_reject static inline __init int load_module_cert(struct key *keyring) { @@ -41,8 +45,14 @@ extern int restrict_link_by_builtin_and_secondary_trusted( const struct key_type *type, const union key_payload *payload, struct key *restriction_key); +extern int restrict_link_by_ca_builtin_and_secondary_trusted( + struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *restrict_key); #else #define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted +#define restrict_link_by_ca_builtin_and_secondary_trusted restrict_link_by_builtin_trusted #endif #ifdef CONFIG_INTEGRITY_MACHINE_KEYRING From patchwork Wed Dec 7 17:12:35 2022 Content-Type: text/plain; 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Wed, 7 Dec 2022 17:12:57 +0000 Received: from CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::f006:f411:9056:63a4]) by CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::f006:f411:9056:63a4%4]) with mapi id 15.20.5880.014; Wed, 7 Dec 2022 17:12:57 +0000 From: Eric Snowberg To: jarkko@kernel.org, zohar@linux.ibm.com Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, noodles@fb.com, tiwai@suse.de, bp@suse.de, eric.snowberg@oracle.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, erpalmer@linux.vnet.ibm.com, coxu@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 07/10] KEYS: X.509: Flag Intermediate CA certs as endorsed Date: Wed, 7 Dec 2022 12:12:35 -0500 Message-Id: <20221207171238.2945307-8-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20221207171238.2945307-1-eric.snowberg@oracle.com> References: <20221207171238.2945307-1-eric.snowberg@oracle.com> X-ClientProxiedBy: BYAPR07CA0097.namprd07.prod.outlook.com (2603:10b6:a03:12b::38) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4150:EE_|DS7PR10MB5293:EE_ X-MS-Office365-Filtering-Correlation-Id: 43bbc110-1938-49b2-6aeb-08dad876494c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Allow intermediate CA certs to be added. Requirements for an intermediate CA include: Usage extension defined as keyCertSign, Basic Constrains for CA is false, and Intermediate CA cert is signed by a current endorsed CA. Signed-off-by: Eric Snowberg --- crypto/asymmetric_keys/x509_public_key.c | 14 ++++++++++++-- include/linux/ima.h | 11 +++++++++++ include/linux/key-type.h | 1 + security/keys/key.c | 5 +++++ 4 files changed, 29 insertions(+), 2 deletions(-) diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 64cffedc4dd0..7a87d5c0c32b 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -208,8 +208,18 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) goto error_free_kids; } - if (cert->kcs_set && cert->self_signed && cert->root_ca) - prep->payload_flags |= KEY_ALLOC_PECA; + if (cert->kcs_set) { + if (cert->self_signed && cert->root_ca) + prep->payload_flags |= KEY_ALLOC_PECA; + /* + * In this case it could be an Intermediate CA. Set + * KEY_MAYBE_PECA for now. If the restriction check + * passes later, the key will be allocated with the + * correct CA flag + */ + else if (!cert->self_signed && !cert->root_ca) + prep->payload_flags |= KEY_MAYBE_PECA; + } /* We're pinning the module by being linked against it */ __module_get(public_key_subtype.owner); diff --git a/include/linux/ima.h b/include/linux/ima.h index 81708ca0ebc7..6597081b6b1a 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -12,6 +12,7 @@ #include #include #include +#include struct linux_binprm; #ifdef CONFIG_IMA @@ -181,6 +182,16 @@ static inline void ima_post_key_create_or_update(struct key *keyring, bool create) {} #endif /* CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS */ +#ifdef CONFIG_ASYMMETRIC_KEY_TYPE +#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING +#define ima_validate_builtin_ca restrict_link_by_ca_builtin_and_secondary_trusted +#else +#define ima_validate_builtin_ca restrict_link_by_ca_builtin_trusted +#endif +#else +#define ima_validate_builtin_ca restrict_link_reject +#endif + #ifdef CONFIG_IMA_APPRAISE extern bool is_ima_appraise_enabled(void); extern void ima_inode_post_setattr(struct user_namespace *mnt_userns, diff --git a/include/linux/key-type.h b/include/linux/key-type.h index 0b500578441c..0d2f95f6b8a1 100644 --- a/include/linux/key-type.h +++ b/include/linux/key-type.h @@ -38,6 +38,7 @@ struct key_preparsed_payload { time64_t expiry; /* Expiry time of key */ unsigned int payload_flags; /* Proposed payload flags */ #define KEY_ALLOC_PECA 0x0001 /* Proposed Endorsed CA (ECA) key */ +#define KEY_MAYBE_PECA 0x0002 /* Proposed possible ECA key */ } __randomize_layout; typedef int (*request_key_actor_t)(struct key *auth_key, void *aux); diff --git a/security/keys/key.c b/security/keys/key.c index e6b4946aca70..69d5f143683f 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -900,6 +900,11 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, } } + /* Previous restriction check passed therefore try to validate endorsed ca */ + if ((prep.payload_flags & KEY_MAYBE_PECA) && + !(ima_validate_builtin_ca(keyring, index_key.type, &prep.payload, NULL))) + prep.payload_flags |= KEY_ALLOC_PECA; + /* if we're going to allocate a new key, we're going to have * to modify the keyring */ ret = key_permission(keyring_ref, KEY_NEED_WRITE); From patchwork Wed Dec 7 17:12:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067380 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8F7C5C64E67 for ; Wed, 7 Dec 2022 17:13:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229942AbiLGRNs (ORCPT ); Wed, 7 Dec 2022 12:13:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229820AbiLGRNn (ORCPT ); Wed, 7 Dec 2022 12:13:43 -0500 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 837D167207; 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These keys must also be self signed, have the CA bit set and have the keyCertSign KeyUsage bit set. Or they could be validated by a properly formed intermediate CA. Currently these restrictions are not enforced. Use the new restrict_link_by_ca_builtin_and_secondary_trusted and restrict_link_by_ca_builtin_trusted to enforce the missing CA restrictions when adding keys to the IMA keyring. With the CA restrictions enforced, allow the machine keyring to be enabled with IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY. Signed-off-by: Eric Snowberg --- security/integrity/Kconfig | 1 - security/integrity/digsig.c | 4 ++-- security/integrity/ima/Kconfig | 6 +++--- 3 files changed, 5 insertions(+), 6 deletions(-) diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 599429f99f99..14cc3c767270 100644 --- a/security/integrity/Kconfig +++ b/security/integrity/Kconfig @@ -68,7 +68,6 @@ config INTEGRITY_MACHINE_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 diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 8a82a6c7f48a..1fe8d1ed6e0b 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -34,9 +34,9 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = { }; #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY -#define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted +#define restrict_link_to_ima restrict_link_by_ca_builtin_and_secondary_trusted #else -#define restrict_link_to_ima restrict_link_by_builtin_trusted +#define restrict_link_to_ima restrict_link_by_ca_builtin_trusted #endif static struct key *integrity_keyring_from_id(const unsigned int id) diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index 7249f16257c7..6fe3bd0e5c82 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -269,13 +269,13 @@ config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY default n help Keys may be added to the IMA or IMA blacklist keyrings, if the - key is validly signed by a CA cert in the system built-in or - secondary trusted keyrings. + key is validly signed by a CA cert in the system built-in, + secondary trusted, or machine keyrings. Intermediate keys between those the kernel has compiled in and the IMA keys to be added may be added to the system secondary keyring, provided they are validly signed by a key already resident in the - built-in or secondary trusted keyrings. + built-in, secondary trusted or machine keyrings. config IMA_BLACKLIST_KEYRING bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)" From patchwork Wed Dec 7 17:12:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Snowberg X-Patchwork-Id: 13067376 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30403C6370C for ; Wed, 7 Dec 2022 17:13:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229814AbiLGRNn (ORCPT ); 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Restrict the addition of keys in a keyring based on the key to be added being a CA. Signed-off-by: Eric Snowberg --- crypto/asymmetric_keys/restrict.c | 40 ++++++++++++++++++++++++ crypto/asymmetric_keys/x509_public_key.c | 5 ++- include/crypto/public_key.h | 16 ++++++++++ 3 files changed, 60 insertions(+), 1 deletion(-) diff --git a/crypto/asymmetric_keys/restrict.c b/crypto/asymmetric_keys/restrict.c index 005cb28969e4..ac0a6efafb03 100644 --- a/crypto/asymmetric_keys/restrict.c +++ b/crypto/asymmetric_keys/restrict.c @@ -108,6 +108,46 @@ int restrict_link_by_signature(struct key *dest_keyring, return ret; } +/** + * restrict_link_by_ca - Restrict additions to a ring of CA keys + * @dest_keyring: Keyring being linked to. + * @type: The type of key being added. + * @payload: The payload of the new key. + * @trust_keyring: Unused. + * + * Check if the new certificate is a CA. If it is a CA, then mark the new + * certificate as being ok to link. + * + * Returns 0 if the new certificate was accepted, -ENOKEY if the + * certificate is not a CA. -ENOPKG if the signature uses unsupported + * crypto, or some other error if there is a matching certificate but + * the signature check cannot be performed. + */ +int restrict_link_by_ca(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trust_keyring) +{ + const struct public_key_signature *sig; + const struct public_key *pkey; + + if (type != &key_type_asymmetric) + return -EOPNOTSUPP; + + sig = payload->data[asym_auth]; + if (!sig) + return -ENOPKG; + + pkey = payload->data[asym_crypto]; + if (!pkey) + return -ENOPKG; + + if (!pkey->key_is_ca) + return -ENOKEY; + + return public_key_verify_signature(pkey, sig); +} + int restrict_link_by_ca_and_signature(struct key *dest_keyring, const struct key_type *type, const union key_payload *payload, diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index 7a87d5c0c32b..9c2909fea63e 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -209,8 +209,11 @@ static int x509_key_preparse(struct key_preparsed_payload *prep) } if (cert->kcs_set) { - if (cert->self_signed && cert->root_ca) + if (cert->self_signed && cert->root_ca) { prep->payload_flags |= KEY_ALLOC_PECA; + cert->pub->key_is_ca = true; + } + /* * In this case it could be an Intermediate CA. Set * KEY_MAYBE_PECA for now. If the restriction check diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index e51bbc5ffe17..3de0f8a68914 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -26,6 +26,7 @@ struct public_key { void *params; u32 paramlen; bool key_is_private; + bool key_is_ca; const char *id_type; const char *pkey_algo; }; @@ -76,6 +77,21 @@ extern int restrict_link_by_ca_and_signature(struct key *dest_keyring, const union key_payload *payload, struct key *unused); +#if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE) +extern int restrict_link_by_ca(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trust_keyring); +#else +static inline int restrict_link_by_ca(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trust_keyring) +{ + return 0; +} +#endif + extern int query_asymmetric_key(const struct kernel_pkey_params *, struct kernel_pkey_query *); From patchwork Wed Dec 7 17:12:38 2022 Content-Type: text/plain; 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Wed, 7 Dec 2022 17:13:06 +0000 Received: from CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::f006:f411:9056:63a4]) by CH2PR10MB4150.namprd10.prod.outlook.com ([fe80::f006:f411:9056:63a4%4]) with mapi id 15.20.5880.014; Wed, 7 Dec 2022 17:13:05 +0000 From: Eric Snowberg To: jarkko@kernel.org, zohar@linux.ibm.com Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, noodles@fb.com, tiwai@suse.de, bp@suse.de, eric.snowberg@oracle.com, kanth.ghatraju@oracle.com, konrad.wilk@oracle.com, erpalmer@linux.vnet.ibm.com, coxu@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 10/10] integrity: restrict INTEGRITY_KEYRING_MACHINE to restrict_link_by_ca Date: Wed, 7 Dec 2022 12:12:38 -0500 Message-Id: <20221207171238.2945307-11-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20221207171238.2945307-1-eric.snowberg@oracle.com> References: <20221207171238.2945307-1-eric.snowberg@oracle.com> X-ClientProxiedBy: SJ0PR13CA0138.namprd13.prod.outlook.com (2603:10b6:a03:2c6::23) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4150:EE_|SJ0PR10MB4685:EE_ X-MS-Office365-Filtering-Correlation-Id: 3c609ca5-9f40-435e-8004-08dad8764ddc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This will only allow CA keys into the machine keyring. Signed-off-by: Eric Snowberg --- security/integrity/Kconfig | 10 ++++++++++ security/integrity/digsig.c | 8 ++++++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 14cc3c767270..3357883fa5a8 100644 --- a/security/integrity/Kconfig +++ b/security/integrity/Kconfig @@ -74,6 +74,16 @@ config INTEGRITY_MACHINE_KEYRING in the platform keyring, keys contained in the .machine keyring will be trusted within the kernel. +config INTEGRITY_CA_MACHINE_KEYRING + bool "Only allow CA keys into the Machine Keyring" + depends on INTEGRITY_MACHINE_KEYRING + help + If set, only Machine Owner Keys (MOK) that are Certificate + Authority (CA) keys will be added to the .machine keyring. All + other MOK keys will be added to the .platform keyring. After + booting, any other key signed by the CA key can be added to the + secondary_trusted_keys keyring. + config LOAD_UEFI_KEYS depends on INTEGRITY_PLATFORM_KEYRING depends on EFI diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 1fe8d1ed6e0b..b0ec615745e3 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -131,7 +131,8 @@ int __init integrity_init_keyring(const unsigned int id) | KEY_USR_READ | KEY_USR_SEARCH; if (id == INTEGRITY_KEYRING_PLATFORM || - id == INTEGRITY_KEYRING_MACHINE) { + (id == INTEGRITY_KEYRING_MACHINE && + !IS_ENABLED(CONFIG_INTEGRITY_CA_MACHINE_KEYRING))) { restriction = NULL; goto out; } @@ -143,7 +144,10 @@ int __init integrity_init_keyring(const unsigned int id) if (!restriction) return -ENOMEM; - restriction->check = restrict_link_to_ima; + if (id == INTEGRITY_KEYRING_MACHINE) + restriction->check = restrict_link_by_ca; + else + restriction->check = restrict_link_to_ima; /* * MOK keys can only be added through a read-only runtime services