lib: crypto: add x509 parser
Imported from linux kernel v5.3: x509.asn1 without changes x509_akid.asn1 without changes x509_parser.h without changes x509_cert_parser.c with changes marked as __UBOOT__ x509_public_key.c with changes marked as __UBOOT__ Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro
Tom Rini
parent
9b933bf6f4
commit
b4adf627d5
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@ -265,6 +265,7 @@ config AES
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present.
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source lib/rsa/Kconfig
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source lib/crypto/Kconfig
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config TPM
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bool "Trusted Platform Module (TPM) Support"
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@ -18,6 +18,7 @@ obj-$(CONFIG_CMD_DHRYSTONE) += dhry/
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obj-$(CONFIG_ARCH_AT91) += at91/
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obj-$(CONFIG_OPTEE) += optee/
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obj-$(CONFIG_ASN1_DECODER) += asn1_decoder.o
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obj-y += crypto/
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obj-$(CONFIG_AES) += aes.o
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@ -27,4 +27,16 @@ config RSA_PUBLIC_KEY_PARSER
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public key data and provides the ability to instantiate a public
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key.
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config X509_CERTIFICATE_PARSER
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bool "X.509 certificate parser"
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depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
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select ASN1_DECODER
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select ASN1_COMPILER
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select OID_REGISTRY
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select LIB_DATE
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help
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This option provides support for parsing X.509 format blobs for key
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data and provides the ability to instantiate a crypto key from a
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public key packet found inside the certificate.
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endif # ASYMMETRIC_KEY_TYPE
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@ -19,3 +19,20 @@ rsa_public_key-y := \
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$(obj)/rsapubkey.asn1.o: $(obj)/rsapubkey.asn1.c $(obj)/rsapubkey.asn1.h
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$(obj)/rsa_helper.o: $(obj)/rsapubkey.asn1.h
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#
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# X.509 Certificate handling
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#
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obj-$(CONFIG_X509_CERTIFICATE_PARSER) += x509_key_parser.o
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x509_key_parser-y := \
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x509.asn1.o \
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x509_akid.asn1.o \
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x509_cert_parser.o \
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x509_public_key.o
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$(obj)/x509_cert_parser.o: \
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$(obj)/x509.asn1.h \
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$(obj)/x509_akid.asn1.h
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$(obj)/x509.asn1.o: $(obj)/x509.asn1.c $(obj)/x509.asn1.h
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$(obj)/x509_akid.asn1.o: $(obj)/x509_akid.asn1.c $(obj)/x509_akid.asn1.h
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@ -0,0 +1,60 @@
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Certificate ::= SEQUENCE {
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tbsCertificate TBSCertificate ({ x509_note_tbs_certificate }),
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signatureAlgorithm AlgorithmIdentifier,
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signature BIT STRING ({ x509_note_signature })
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}
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TBSCertificate ::= SEQUENCE {
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version [ 0 ] Version DEFAULT,
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serialNumber CertificateSerialNumber ({ x509_note_serial }),
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signature AlgorithmIdentifier ({ x509_note_pkey_algo }),
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issuer Name ({ x509_note_issuer }),
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validity Validity,
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subject Name ({ x509_note_subject }),
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subjectPublicKeyInfo SubjectPublicKeyInfo,
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issuerUniqueID [ 1 ] IMPLICIT UniqueIdentifier OPTIONAL,
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subjectUniqueID [ 2 ] IMPLICIT UniqueIdentifier OPTIONAL,
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extensions [ 3 ] Extensions OPTIONAL
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}
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Version ::= INTEGER
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CertificateSerialNumber ::= INTEGER
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AlgorithmIdentifier ::= SEQUENCE {
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algorithm OBJECT IDENTIFIER ({ x509_note_OID }),
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parameters ANY OPTIONAL ({ x509_note_params })
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}
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Name ::= SEQUENCE OF RelativeDistinguishedName
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RelativeDistinguishedName ::= SET OF AttributeValueAssertion
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AttributeValueAssertion ::= SEQUENCE {
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attributeType OBJECT IDENTIFIER ({ x509_note_OID }),
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attributeValue ANY ({ x509_extract_name_segment })
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}
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Validity ::= SEQUENCE {
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notBefore Time ({ x509_note_not_before }),
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notAfter Time ({ x509_note_not_after })
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}
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Time ::= CHOICE {
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utcTime UTCTime,
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generalTime GeneralizedTime
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}
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SubjectPublicKeyInfo ::= SEQUENCE {
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algorithm AlgorithmIdentifier,
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subjectPublicKey BIT STRING ({ x509_extract_key_data })
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}
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UniqueIdentifier ::= BIT STRING
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Extensions ::= SEQUENCE OF Extension
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Extension ::= SEQUENCE {
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extnid OBJECT IDENTIFIER ({ x509_note_OID }),
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critical BOOLEAN DEFAULT,
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extnValue OCTET STRING ({ x509_process_extension })
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}
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@ -0,0 +1,35 @@
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-- X.509 AuthorityKeyIdentifier
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-- rfc5280 section 4.2.1.1
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AuthorityKeyIdentifier ::= SEQUENCE {
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keyIdentifier [0] IMPLICIT KeyIdentifier OPTIONAL,
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authorityCertIssuer [1] IMPLICIT GeneralNames OPTIONAL,
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authorityCertSerialNumber [2] IMPLICIT CertificateSerialNumber OPTIONAL
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}
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KeyIdentifier ::= OCTET STRING ({ x509_akid_note_kid })
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CertificateSerialNumber ::= INTEGER ({ x509_akid_note_serial })
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GeneralNames ::= SEQUENCE OF GeneralName
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GeneralName ::= CHOICE {
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otherName [0] ANY,
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rfc822Name [1] IA5String,
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dNSName [2] IA5String,
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x400Address [3] ANY,
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directoryName [4] Name ({ x509_akid_note_name }),
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ediPartyName [5] ANY,
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uniformResourceIdentifier [6] IA5String,
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iPAddress [7] OCTET STRING,
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registeredID [8] OBJECT IDENTIFIER
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}
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Name ::= SEQUENCE OF RelativeDistinguishedName
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RelativeDistinguishedName ::= SET OF AttributeValueAssertion
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AttributeValueAssertion ::= SEQUENCE {
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attributeType OBJECT IDENTIFIER ({ x509_note_OID }),
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attributeValue ANY ({ x509_extract_name_segment })
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}
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@ -0,0 +1,697 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* X.509 certificate parser
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) "X.509: "fmt
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#include <linux/kernel.h>
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#ifndef __UBOOT__
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#include <linux/export.h>
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#include <linux/slab.h>
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#endif
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#include <linux/err.h>
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#include <linux/oid_registry.h>
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#ifdef __UBOOT__
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#include <linux/string.h>
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#endif
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#include <crypto/public_key.h>
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#include "x509_parser.h"
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#include "x509.asn1.h"
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#include "x509_akid.asn1.h"
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struct x509_parse_context {
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struct x509_certificate *cert; /* Certificate being constructed */
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unsigned long data; /* Start of data */
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const void *cert_start; /* Start of cert content */
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const void *key; /* Key data */
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size_t key_size; /* Size of key data */
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const void *params; /* Key parameters */
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size_t params_size; /* Size of key parameters */
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enum OID key_algo; /* Public key algorithm */
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enum OID last_oid; /* Last OID encountered */
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enum OID algo_oid; /* Algorithm OID */
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unsigned char nr_mpi; /* Number of MPIs stored */
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u8 o_size; /* Size of organizationName (O) */
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u8 cn_size; /* Size of commonName (CN) */
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u8 email_size; /* Size of emailAddress */
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u16 o_offset; /* Offset of organizationName (O) */
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u16 cn_offset; /* Offset of commonName (CN) */
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u16 email_offset; /* Offset of emailAddress */
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unsigned raw_akid_size;
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const void *raw_akid; /* Raw authorityKeyId in ASN.1 */
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const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */
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unsigned akid_raw_issuer_size;
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};
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/*
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* Free an X.509 certificate
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*/
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void x509_free_certificate(struct x509_certificate *cert)
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{
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if (cert) {
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public_key_free(cert->pub);
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public_key_signature_free(cert->sig);
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kfree(cert->issuer);
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kfree(cert->subject);
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kfree(cert->id);
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kfree(cert->skid);
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kfree(cert);
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}
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}
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EXPORT_SYMBOL_GPL(x509_free_certificate);
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/*
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* Parse an X.509 certificate
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*/
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struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
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{
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struct x509_certificate *cert;
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struct x509_parse_context *ctx;
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struct asymmetric_key_id *kid;
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long ret;
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ret = -ENOMEM;
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cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
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if (!cert)
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goto error_no_cert;
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cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
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if (!cert->pub)
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goto error_no_ctx;
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cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
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if (!cert->sig)
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goto error_no_ctx;
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ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
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if (!ctx)
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goto error_no_ctx;
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ctx->cert = cert;
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ctx->data = (unsigned long)data;
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/* Attempt to decode the certificate */
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ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
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if (ret < 0)
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goto error_decode;
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/* Decode the AuthorityKeyIdentifier */
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if (ctx->raw_akid) {
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pr_devel("AKID: %u %*phN\n",
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ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
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ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
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ctx->raw_akid, ctx->raw_akid_size);
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if (ret < 0) {
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pr_warn("Couldn't decode AuthKeyIdentifier\n");
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goto error_decode;
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}
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}
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ret = -ENOMEM;
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cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
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if (!cert->pub->key)
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goto error_decode;
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cert->pub->keylen = ctx->key_size;
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cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
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if (!cert->pub->params)
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goto error_decode;
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cert->pub->paramlen = ctx->params_size;
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cert->pub->algo = ctx->key_algo;
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/* Grab the signature bits */
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ret = x509_get_sig_params(cert);
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if (ret < 0)
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goto error_decode;
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/* Generate cert issuer + serial number key ID */
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kid = asymmetric_key_generate_id(cert->raw_serial,
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cert->raw_serial_size,
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cert->raw_issuer,
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cert->raw_issuer_size);
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if (IS_ERR(kid)) {
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ret = PTR_ERR(kid);
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goto error_decode;
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}
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cert->id = kid;
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#ifndef __UBOOT__
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/* Detect self-signed certificates */
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ret = x509_check_for_self_signed(cert);
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if (ret < 0)
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goto error_decode;
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#endif
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kfree(ctx);
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return cert;
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error_decode:
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kfree(ctx);
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error_no_ctx:
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x509_free_certificate(cert);
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error_no_cert:
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(x509_cert_parse);
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/*
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* Note an OID when we find one for later processing when we know how
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* to interpret it.
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*/
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int x509_note_OID(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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ctx->last_oid = look_up_OID(value, vlen);
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if (ctx->last_oid == OID__NR) {
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char buffer[50];
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sprint_oid(value, vlen, buffer, sizeof(buffer));
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pr_debug("Unknown OID: [%lu] %s\n",
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(unsigned long)value - ctx->data, buffer);
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}
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return 0;
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}
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/*
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* Save the position of the TBS data so that we can check the signature over it
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* later.
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*/
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int x509_note_tbs_certificate(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
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hdrlen, tag, (unsigned long)value - ctx->data, vlen);
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ctx->cert->tbs = value - hdrlen;
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ctx->cert->tbs_size = vlen + hdrlen;
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return 0;
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}
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/*
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* Record the public key algorithm
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*/
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int x509_note_pkey_algo(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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pr_debug("PubKey Algo: %u\n", ctx->last_oid);
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switch (ctx->last_oid) {
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case OID_md2WithRSAEncryption:
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case OID_md3WithRSAEncryption:
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default:
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return -ENOPKG; /* Unsupported combination */
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case OID_md4WithRSAEncryption:
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ctx->cert->sig->hash_algo = "md4";
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goto rsa_pkcs1;
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case OID_sha1WithRSAEncryption:
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ctx->cert->sig->hash_algo = "sha1";
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goto rsa_pkcs1;
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case OID_sha256WithRSAEncryption:
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ctx->cert->sig->hash_algo = "sha256";
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goto rsa_pkcs1;
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case OID_sha384WithRSAEncryption:
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ctx->cert->sig->hash_algo = "sha384";
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goto rsa_pkcs1;
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case OID_sha512WithRSAEncryption:
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ctx->cert->sig->hash_algo = "sha512";
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goto rsa_pkcs1;
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case OID_sha224WithRSAEncryption:
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ctx->cert->sig->hash_algo = "sha224";
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goto rsa_pkcs1;
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case OID_gost2012Signature256:
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ctx->cert->sig->hash_algo = "streebog256";
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goto ecrdsa;
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case OID_gost2012Signature512:
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ctx->cert->sig->hash_algo = "streebog512";
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goto ecrdsa;
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}
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rsa_pkcs1:
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ctx->cert->sig->pkey_algo = "rsa";
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ctx->cert->sig->encoding = "pkcs1";
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ctx->algo_oid = ctx->last_oid;
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return 0;
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ecrdsa:
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ctx->cert->sig->pkey_algo = "ecrdsa";
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ctx->cert->sig->encoding = "raw";
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ctx->algo_oid = ctx->last_oid;
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return 0;
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}
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/*
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* Note the whereabouts and type of the signature.
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*/
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int x509_note_signature(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);
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if (ctx->last_oid != ctx->algo_oid) {
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pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
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ctx->algo_oid, ctx->last_oid);
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return -EINVAL;
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}
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if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
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strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) {
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/* Discard the BIT STRING metadata */
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if (vlen < 1 || *(const u8 *)value != 0)
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return -EBADMSG;
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value++;
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vlen--;
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}
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ctx->cert->raw_sig = value;
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ctx->cert->raw_sig_size = vlen;
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return 0;
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}
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/*
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* Note the certificate serial number
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*/
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int x509_note_serial(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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ctx->cert->raw_serial = value;
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ctx->cert->raw_serial_size = vlen;
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return 0;
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}
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/*
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* Note some of the name segments from which we'll fabricate a name.
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*/
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int x509_extract_name_segment(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct x509_parse_context *ctx = context;
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switch (ctx->last_oid) {
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case OID_commonName:
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ctx->cn_size = vlen;
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ctx->cn_offset = (unsigned long)value - ctx->data;
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break;
|
||||
case OID_organizationName:
|
||||
ctx->o_size = vlen;
|
||||
ctx->o_offset = (unsigned long)value - ctx->data;
|
||||
break;
|
||||
case OID_email_address:
|
||||
ctx->email_size = vlen;
|
||||
ctx->email_offset = (unsigned long)value - ctx->data;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fabricate and save the issuer and subject names
|
||||
*/
|
||||
static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
char **_name, size_t vlen)
|
||||
{
|
||||
const void *name, *data = (const void *)ctx->data;
|
||||
size_t namesize;
|
||||
char *buffer;
|
||||
|
||||
if (*_name)
|
||||
return -EINVAL;
|
||||
|
||||
/* Empty name string if no material */
|
||||
if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
|
||||
buffer = kmalloc(1, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
buffer[0] = 0;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (ctx->cn_size && ctx->o_size) {
|
||||
/* Consider combining O and CN, but use only the CN if it is
|
||||
* prefixed by the O, or a significant portion thereof.
|
||||
*/
|
||||
namesize = ctx->cn_size;
|
||||
name = data + ctx->cn_offset;
|
||||
if (ctx->cn_size >= ctx->o_size &&
|
||||
memcmp(data + ctx->cn_offset, data + ctx->o_offset,
|
||||
ctx->o_size) == 0)
|
||||
goto single_component;
|
||||
if (ctx->cn_size >= 7 &&
|
||||
ctx->o_size >= 7 &&
|
||||
memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
|
||||
goto single_component;
|
||||
|
||||
buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
|
||||
GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(buffer,
|
||||
data + ctx->o_offset, ctx->o_size);
|
||||
buffer[ctx->o_size + 0] = ':';
|
||||
buffer[ctx->o_size + 1] = ' ';
|
||||
memcpy(buffer + ctx->o_size + 2,
|
||||
data + ctx->cn_offset, ctx->cn_size);
|
||||
buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
|
||||
goto done;
|
||||
|
||||
} else if (ctx->cn_size) {
|
||||
namesize = ctx->cn_size;
|
||||
name = data + ctx->cn_offset;
|
||||
} else if (ctx->o_size) {
|
||||
namesize = ctx->o_size;
|
||||
name = data + ctx->o_offset;
|
||||
} else {
|
||||
namesize = ctx->email_size;
|
||||
name = data + ctx->email_offset;
|
||||
}
|
||||
|
||||
single_component:
|
||||
buffer = kmalloc(namesize + 1, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
memcpy(buffer, name, namesize);
|
||||
buffer[namesize] = 0;
|
||||
|
||||
done:
|
||||
*_name = buffer;
|
||||
ctx->cn_size = 0;
|
||||
ctx->o_size = 0;
|
||||
ctx->email_size = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int x509_note_issuer(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
ctx->cert->raw_issuer = value;
|
||||
ctx->cert->raw_issuer_size = vlen;
|
||||
return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
|
||||
}
|
||||
|
||||
int x509_note_subject(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
ctx->cert->raw_subject = value;
|
||||
ctx->cert->raw_subject_size = vlen;
|
||||
return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
|
||||
}
|
||||
|
||||
/*
|
||||
* Extract the parameters for the public key
|
||||
*/
|
||||
int x509_note_params(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
|
||||
/*
|
||||
* AlgorithmIdentifier is used three times in the x509, we should skip
|
||||
* first and ignore third, using second one which is after subject and
|
||||
* before subjectPublicKey.
|
||||
*/
|
||||
if (!ctx->cert->raw_subject || ctx->key)
|
||||
return 0;
|
||||
ctx->params = value - hdrlen;
|
||||
ctx->params_size = vlen + hdrlen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Extract the data for the public key algorithm
|
||||
*/
|
||||
int x509_extract_key_data(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
|
||||
ctx->key_algo = ctx->last_oid;
|
||||
if (ctx->last_oid == OID_rsaEncryption)
|
||||
ctx->cert->pub->pkey_algo = "rsa";
|
||||
else if (ctx->last_oid == OID_gost2012PKey256 ||
|
||||
ctx->last_oid == OID_gost2012PKey512)
|
||||
ctx->cert->pub->pkey_algo = "ecrdsa";
|
||||
else
|
||||
return -ENOPKG;
|
||||
|
||||
/* Discard the BIT STRING metadata */
|
||||
if (vlen < 1 || *(const u8 *)value != 0)
|
||||
return -EBADMSG;
|
||||
ctx->key = value + 1;
|
||||
ctx->key_size = vlen - 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
|
||||
#define SEQ_TAG_KEYID (ASN1_CONT << 6)
|
||||
|
||||
/*
|
||||
* Process certificate extensions that are used to qualify the certificate.
|
||||
*/
|
||||
int x509_process_extension(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
struct asymmetric_key_id *kid;
|
||||
const unsigned char *v = value;
|
||||
|
||||
pr_debug("Extension: %u\n", ctx->last_oid);
|
||||
|
||||
if (ctx->last_oid == OID_subjectKeyIdentifier) {
|
||||
/* Get hold of the key fingerprint */
|
||||
if (ctx->cert->skid || vlen < 3)
|
||||
return -EBADMSG;
|
||||
if (v[0] != ASN1_OTS || v[1] != vlen - 2)
|
||||
return -EBADMSG;
|
||||
v += 2;
|
||||
vlen -= 2;
|
||||
|
||||
ctx->cert->raw_skid_size = vlen;
|
||||
ctx->cert->raw_skid = v;
|
||||
kid = asymmetric_key_generate_id(v, vlen, "", 0);
|
||||
if (IS_ERR(kid))
|
||||
return PTR_ERR(kid);
|
||||
ctx->cert->skid = kid;
|
||||
pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (ctx->last_oid == OID_authorityKeyIdentifier) {
|
||||
/* Get hold of the CA key fingerprint */
|
||||
ctx->raw_akid = v;
|
||||
ctx->raw_akid_size = vlen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* x509_decode_time - Decode an X.509 time ASN.1 object
|
||||
* @_t: The time to fill in
|
||||
* @hdrlen: The length of the object header
|
||||
* @tag: The object tag
|
||||
* @value: The object value
|
||||
* @vlen: The size of the object value
|
||||
*
|
||||
* Decode an ASN.1 universal time or generalised time field into a struct the
|
||||
* kernel can handle and check it for validity. The time is decoded thus:
|
||||
*
|
||||
* [RFC5280 §4.1.2.5]
|
||||
* CAs conforming to this profile MUST always encode certificate validity
|
||||
* dates through the year 2049 as UTCTime; certificate validity dates in
|
||||
* 2050 or later MUST be encoded as GeneralizedTime. Conforming
|
||||
* applications MUST be able to process validity dates that are encoded in
|
||||
* either UTCTime or GeneralizedTime.
|
||||
*/
|
||||
int x509_decode_time(time64_t *_t, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const unsigned char *value, size_t vlen)
|
||||
{
|
||||
static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
|
||||
31, 31, 30, 31, 30, 31 };
|
||||
const unsigned char *p = value;
|
||||
unsigned year, mon, day, hour, min, sec, mon_len;
|
||||
|
||||
#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
|
||||
#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
|
||||
|
||||
if (tag == ASN1_UNITIM) {
|
||||
/* UTCTime: YYMMDDHHMMSSZ */
|
||||
if (vlen != 13)
|
||||
goto unsupported_time;
|
||||
year = DD2bin(p);
|
||||
if (year >= 50)
|
||||
year += 1900;
|
||||
else
|
||||
year += 2000;
|
||||
} else if (tag == ASN1_GENTIM) {
|
||||
/* GenTime: YYYYMMDDHHMMSSZ */
|
||||
if (vlen != 15)
|
||||
goto unsupported_time;
|
||||
year = DD2bin(p) * 100 + DD2bin(p);
|
||||
if (year >= 1950 && year <= 2049)
|
||||
goto invalid_time;
|
||||
} else {
|
||||
goto unsupported_time;
|
||||
}
|
||||
|
||||
mon = DD2bin(p);
|
||||
day = DD2bin(p);
|
||||
hour = DD2bin(p);
|
||||
min = DD2bin(p);
|
||||
sec = DD2bin(p);
|
||||
|
||||
if (*p != 'Z')
|
||||
goto unsupported_time;
|
||||
|
||||
if (year < 1970 ||
|
||||
mon < 1 || mon > 12)
|
||||
goto invalid_time;
|
||||
|
||||
mon_len = month_lengths[mon - 1];
|
||||
if (mon == 2) {
|
||||
if (year % 4 == 0) {
|
||||
mon_len = 29;
|
||||
if (year % 100 == 0) {
|
||||
mon_len = 28;
|
||||
if (year % 400 == 0)
|
||||
mon_len = 29;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (day < 1 || day > mon_len ||
|
||||
hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
|
||||
min > 59 ||
|
||||
sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
|
||||
goto invalid_time;
|
||||
|
||||
*_t = mktime64(year, mon, day, hour, min, sec);
|
||||
return 0;
|
||||
|
||||
unsupported_time:
|
||||
pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
|
||||
tag, (int)vlen, value);
|
||||
return -EBADMSG;
|
||||
invalid_time:
|
||||
pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
|
||||
tag, (int)vlen, value);
|
||||
return -EBADMSG;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(x509_decode_time);
|
||||
|
||||
int x509_note_not_before(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
|
||||
}
|
||||
|
||||
int x509_note_not_after(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
|
||||
}
|
||||
|
||||
/*
|
||||
* Note a key identifier-based AuthorityKeyIdentifier
|
||||
*/
|
||||
int x509_akid_note_kid(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
struct asymmetric_key_id *kid;
|
||||
|
||||
pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
|
||||
|
||||
if (ctx->cert->sig->auth_ids[1])
|
||||
return 0;
|
||||
|
||||
kid = asymmetric_key_generate_id(value, vlen, "", 0);
|
||||
if (IS_ERR(kid))
|
||||
return PTR_ERR(kid);
|
||||
pr_debug("authkeyid %*phN\n", kid->len, kid->data);
|
||||
ctx->cert->sig->auth_ids[1] = kid;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Note a directoryName in an AuthorityKeyIdentifier
|
||||
*/
|
||||
int x509_akid_note_name(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
|
||||
pr_debug("AKID: name: %*phN\n", (int)vlen, value);
|
||||
|
||||
ctx->akid_raw_issuer = value;
|
||||
ctx->akid_raw_issuer_size = vlen;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Note a serial number in an AuthorityKeyIdentifier
|
||||
*/
|
||||
int x509_akid_note_serial(void *context, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const void *value, size_t vlen)
|
||||
{
|
||||
struct x509_parse_context *ctx = context;
|
||||
struct asymmetric_key_id *kid;
|
||||
|
||||
pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
|
||||
|
||||
if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
|
||||
return 0;
|
||||
|
||||
kid = asymmetric_key_generate_id(value,
|
||||
vlen,
|
||||
ctx->akid_raw_issuer,
|
||||
ctx->akid_raw_issuer_size);
|
||||
if (IS_ERR(kid))
|
||||
return PTR_ERR(kid);
|
||||
|
||||
pr_debug("authkeyid %*phN\n", kid->len, kid->data);
|
||||
ctx->cert->sig->auth_ids[0] = kid;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,57 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||||
/* X.509 certificate parser internal definitions
|
||||
*
|
||||
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
||||
* Written by David Howells (dhowells@redhat.com)
|
||||
*/
|
||||
|
||||
#include <linux/time.h>
|
||||
#include <crypto/public_key.h>
|
||||
#include <keys/asymmetric-type.h>
|
||||
|
||||
struct x509_certificate {
|
||||
struct x509_certificate *next;
|
||||
struct x509_certificate *signer; /* Certificate that signed this one */
|
||||
struct public_key *pub; /* Public key details */
|
||||
struct public_key_signature *sig; /* Signature parameters */
|
||||
char *issuer; /* Name of certificate issuer */
|
||||
char *subject; /* Name of certificate subject */
|
||||
struct asymmetric_key_id *id; /* Issuer + Serial number */
|
||||
struct asymmetric_key_id *skid; /* Subject + subjectKeyId (optional) */
|
||||
time64_t valid_from;
|
||||
time64_t valid_to;
|
||||
const void *tbs; /* Signed data */
|
||||
unsigned tbs_size; /* Size of signed data */
|
||||
unsigned raw_sig_size; /* Size of sigature */
|
||||
const void *raw_sig; /* Signature data */
|
||||
const void *raw_serial; /* Raw serial number in ASN.1 */
|
||||
unsigned raw_serial_size;
|
||||
unsigned raw_issuer_size;
|
||||
const void *raw_issuer; /* Raw issuer name in ASN.1 */
|
||||
const void *raw_subject; /* Raw subject name in ASN.1 */
|
||||
unsigned raw_subject_size;
|
||||
unsigned raw_skid_size;
|
||||
const void *raw_skid; /* Raw subjectKeyId in ASN.1 */
|
||||
unsigned index;
|
||||
bool seen; /* Infinite recursion prevention */
|
||||
bool verified;
|
||||
bool self_signed; /* T if self-signed (check unsupported_sig too) */
|
||||
bool unsupported_key; /* T if key uses unsupported crypto */
|
||||
bool unsupported_sig; /* T if signature uses unsupported crypto */
|
||||
bool blacklisted;
|
||||
};
|
||||
|
||||
/*
|
||||
* x509_cert_parser.c
|
||||
*/
|
||||
extern void x509_free_certificate(struct x509_certificate *cert);
|
||||
extern struct x509_certificate *x509_cert_parse(const void *data, size_t datalen);
|
||||
extern int x509_decode_time(time64_t *_t, size_t hdrlen,
|
||||
unsigned char tag,
|
||||
const unsigned char *value, size_t vlen);
|
||||
|
||||
/*
|
||||
* x509_public_key.c
|
||||
*/
|
||||
extern int x509_get_sig_params(struct x509_certificate *cert);
|
||||
extern int x509_check_for_self_signed(struct x509_certificate *cert);
|
||||
|
|
@ -0,0 +1,292 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
/* Instantiate a public key crypto key from an X.509 Certificate
|
||||
*
|
||||
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
||||
* Written by David Howells (dhowells@redhat.com)
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "X.509: "fmt
|
||||
#ifdef __UBOOT__
|
||||
#include <common.h>
|
||||
#include <linux/compat.h>
|
||||
#include <linux/errno.h>
|
||||
#else
|
||||
#include <linux/module.h>
|
||||
#endif
|
||||
#include <linux/kernel.h>
|
||||
#ifndef __UBOOT__
|
||||
#include <linux/slab.h>
|
||||
#include <keys/asymmetric-subtype.h>
|
||||
#include <keys/asymmetric-parser.h>
|
||||
#include <keys/system_keyring.h>
|
||||
#include <crypto/hash.h>
|
||||
#include "asymmetric_keys.h"
|
||||
#endif
|
||||
#include "x509_parser.h"
|
||||
|
||||
/*
|
||||
* Set up the signature parameters in an X.509 certificate. This involves
|
||||
* digesting the signed data and extracting the signature.
|
||||
*/
|
||||
int x509_get_sig_params(struct x509_certificate *cert)
|
||||
{
|
||||
struct public_key_signature *sig = cert->sig;
|
||||
#ifndef __UBOOT__
|
||||
struct crypto_shash *tfm;
|
||||
struct shash_desc *desc;
|
||||
size_t desc_size;
|
||||
#endif
|
||||
int ret;
|
||||
|
||||
pr_devel("==>%s()\n", __func__);
|
||||
|
||||
if (!cert->pub->pkey_algo)
|
||||
cert->unsupported_key = true;
|
||||
|
||||
if (!sig->pkey_algo)
|
||||
cert->unsupported_sig = true;
|
||||
|
||||
/* We check the hash if we can - even if we can't then verify it */
|
||||
if (!sig->hash_algo) {
|
||||
cert->unsupported_sig = true;
|
||||
return 0;
|
||||
}
|
||||
|
||||
sig->s = kmemdup(cert->raw_sig, cert->raw_sig_size, GFP_KERNEL);
|
||||
if (!sig->s)
|
||||
return -ENOMEM;
|
||||
|
||||
sig->s_size = cert->raw_sig_size;
|
||||
|
||||
#ifdef __UBOOT__
|
||||
/*
|
||||
* Note:
|
||||
* This part (filling sig->digest) should be implemented if
|
||||
* x509_check_for_self_signed() is enabled x509_cert_parse().
|
||||
* Currently, this check won't affect UEFI secure boot.
|
||||
*/
|
||||
ret = 0;
|
||||
#else
|
||||
/* Allocate the hashing algorithm we're going to need and find out how
|
||||
* big the hash operational data will be.
|
||||
*/
|
||||
tfm = crypto_alloc_shash(sig->hash_algo, 0, 0);
|
||||
if (IS_ERR(tfm)) {
|
||||
if (PTR_ERR(tfm) == -ENOENT) {
|
||||
cert->unsupported_sig = true;
|
||||
return 0;
|
||||
}
|
||||
return PTR_ERR(tfm);
|
||||
}
|
||||
|
||||
desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
|
||||
sig->digest_size = crypto_shash_digestsize(tfm);
|
||||
|
||||
ret = -ENOMEM;
|
||||
sig->digest = kmalloc(sig->digest_size, GFP_KERNEL);
|
||||
if (!sig->digest)
|
||||
goto error;
|
||||
|
||||
desc = kzalloc(desc_size, GFP_KERNEL);
|
||||
if (!desc)
|
||||
goto error;
|
||||
|
||||
desc->tfm = tfm;
|
||||
|
||||
ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size, sig->digest);
|
||||
if (ret < 0)
|
||||
goto error_2;
|
||||
|
||||
ret = is_hash_blacklisted(sig->digest, sig->digest_size, "tbs");
|
||||
if (ret == -EKEYREJECTED) {
|
||||
pr_err("Cert %*phN is blacklisted\n",
|
||||
sig->digest_size, sig->digest);
|
||||
cert->blacklisted = true;
|
||||
ret = 0;
|
||||
}
|
||||
|
||||
error_2:
|
||||
kfree(desc);
|
||||
error:
|
||||
crypto_free_shash(tfm);
|
||||
#endif /* __UBOOT__ */
|
||||
pr_devel("<==%s() = %d\n", __func__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifndef __UBOOT__
|
||||
/*
|
||||
* Check for self-signedness in an X.509 cert and if found, check the signature
|
||||
* immediately if we can.
|
||||
*/
|
||||
int x509_check_for_self_signed(struct x509_certificate *cert)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
pr_devel("==>%s()\n", __func__);
|
||||
|
||||
if (cert->raw_subject_size != cert->raw_issuer_size ||
|
||||
memcmp(cert->raw_subject, cert->raw_issuer,
|
||||
cert->raw_issuer_size) != 0)
|
||||
goto not_self_signed;
|
||||
|
||||
if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1]) {
|
||||
/* If the AKID is present it may have one or two parts. If
|
||||
* both are supplied, both must match.
|
||||
*/
|
||||
bool a = asymmetric_key_id_same(cert->skid, cert->sig->auth_ids[1]);
|
||||
bool b = asymmetric_key_id_same(cert->id, cert->sig->auth_ids[0]);
|
||||
|
||||
if (!a && !b)
|
||||
goto not_self_signed;
|
||||
|
||||
ret = -EKEYREJECTED;
|
||||
if (((a && !b) || (b && !a)) &&
|
||||
cert->sig->auth_ids[0] && cert->sig->auth_ids[1])
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = -EKEYREJECTED;
|
||||
if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0)
|
||||
goto out;
|
||||
|
||||
ret = public_key_verify_signature(cert->pub, cert->sig);
|
||||
if (ret < 0) {
|
||||
if (ret == -ENOPKG) {
|
||||
cert->unsupported_sig = true;
|
||||
ret = 0;
|
||||
}
|
||||
goto out;
|
||||
}
|
||||
|
||||
pr_devel("Cert Self-signature verified");
|
||||
cert->self_signed = true;
|
||||
|
||||
out:
|
||||
pr_devel("<==%s() = %d\n", __func__, ret);
|
||||
return ret;
|
||||
|
||||
not_self_signed:
|
||||
pr_devel("<==%s() = 0 [not]\n", __func__);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Attempt to parse a data blob for a key as an X509 certificate.
|
||||
*/
|
||||
static int x509_key_preparse(struct key_preparsed_payload *prep)
|
||||
{
|
||||
struct asymmetric_key_ids *kids;
|
||||
struct x509_certificate *cert;
|
||||
const char *q;
|
||||
size_t srlen, sulen;
|
||||
char *desc = NULL, *p;
|
||||
int ret;
|
||||
|
||||
cert = x509_cert_parse(prep->data, prep->datalen);
|
||||
if (IS_ERR(cert))
|
||||
return PTR_ERR(cert);
|
||||
|
||||
pr_devel("Cert Issuer: %s\n", cert->issuer);
|
||||
pr_devel("Cert Subject: %s\n", cert->subject);
|
||||
|
||||
if (cert->unsupported_key) {
|
||||
ret = -ENOPKG;
|
||||
goto error_free_cert;
|
||||
}
|
||||
|
||||
pr_devel("Cert Key Algo: %s\n", cert->pub->pkey_algo);
|
||||
pr_devel("Cert Valid period: %lld-%lld\n", cert->valid_from, cert->valid_to);
|
||||
|
||||
cert->pub->id_type = "X509";
|
||||
|
||||
if (cert->unsupported_sig) {
|
||||
public_key_signature_free(cert->sig);
|
||||
cert->sig = NULL;
|
||||
} else {
|
||||
pr_devel("Cert Signature: %s + %s\n",
|
||||
cert->sig->pkey_algo, cert->sig->hash_algo);
|
||||
}
|
||||
|
||||
/* Don't permit addition of blacklisted keys */
|
||||
ret = -EKEYREJECTED;
|
||||
if (cert->blacklisted)
|
||||
goto error_free_cert;
|
||||
|
||||
/* Propose a description */
|
||||
sulen = strlen(cert->subject);
|
||||
if (cert->raw_skid) {
|
||||
srlen = cert->raw_skid_size;
|
||||
q = cert->raw_skid;
|
||||
} else {
|
||||
srlen = cert->raw_serial_size;
|
||||
q = cert->raw_serial;
|
||||
}
|
||||
|
||||
ret = -ENOMEM;
|
||||
desc = kmalloc(sulen + 2 + srlen * 2 + 1, GFP_KERNEL);
|
||||
if (!desc)
|
||||
goto error_free_cert;
|
||||
p = memcpy(desc, cert->subject, sulen);
|
||||
p += sulen;
|
||||
*p++ = ':';
|
||||
*p++ = ' ';
|
||||
p = bin2hex(p, q, srlen);
|
||||
*p = 0;
|
||||
|
||||
kids = kmalloc(sizeof(struct asymmetric_key_ids), GFP_KERNEL);
|
||||
if (!kids)
|
||||
goto error_free_desc;
|
||||
kids->id[0] = cert->id;
|
||||
kids->id[1] = cert->skid;
|
||||
|
||||
/* We're pinning the module by being linked against it */
|
||||
__module_get(public_key_subtype.owner);
|
||||
prep->payload.data[asym_subtype] = &public_key_subtype;
|
||||
prep->payload.data[asym_key_ids] = kids;
|
||||
prep->payload.data[asym_crypto] = cert->pub;
|
||||
prep->payload.data[asym_auth] = cert->sig;
|
||||
prep->description = desc;
|
||||
prep->quotalen = 100;
|
||||
|
||||
/* We've finished with the certificate */
|
||||
cert->pub = NULL;
|
||||
cert->id = NULL;
|
||||
cert->skid = NULL;
|
||||
cert->sig = NULL;
|
||||
desc = NULL;
|
||||
ret = 0;
|
||||
|
||||
error_free_desc:
|
||||
kfree(desc);
|
||||
error_free_cert:
|
||||
x509_free_certificate(cert);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct asymmetric_key_parser x509_key_parser = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "x509",
|
||||
.parse = x509_key_preparse,
|
||||
};
|
||||
|
||||
/*
|
||||
* Module stuff
|
||||
*/
|
||||
static int __init x509_key_init(void)
|
||||
{
|
||||
return register_asymmetric_key_parser(&x509_key_parser);
|
||||
}
|
||||
|
||||
static void __exit x509_key_exit(void)
|
||||
{
|
||||
unregister_asymmetric_key_parser(&x509_key_parser);
|
||||
}
|
||||
|
||||
module_init(x509_key_init);
|
||||
module_exit(x509_key_exit);
|
||||
#endif /* !__UBOOT__ */
|
||||
|
||||
MODULE_DESCRIPTION("X.509 certificate parser");
|
||||
MODULE_AUTHOR("Red Hat, Inc.");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue