| Message ID | 20210131233301.1301787-3-stefanb@linux.ibm.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add support for x509 certs with NIST p256 and p192 keys | expand |
On 2/1/21 7:32 AM, Stefan Berger wrote: > Detect whether a key is an sm2 type of key by its OID in the parameters > array rather than assuming that everything under OID_id_ecPublicKey > is sm2, which is not the case. > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> > Cc: David Howells <dhowells@redhat.com> > Cc: keyrings@vger.kernel.org > --- > crypto/asymmetric_keys/x509_cert_parser.c | 12 +++++++++++- > include/linux/oid_registry.h | 1 + > lib/oid_registry.c | 13 +++++++++++++ > 3 files changed, 25 insertions(+), 1 deletion(-) > > diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c > index 52c9b455fc7d..1621ceaf5c95 100644 > --- a/crypto/asymmetric_keys/x509_cert_parser.c > +++ b/crypto/asymmetric_keys/x509_cert_parser.c > @@ -459,6 +459,7 @@ int x509_extract_key_data(void *context, size_t hdrlen, > const void *value, size_t vlen) > { > struct x509_parse_context *ctx = context; > + enum OID oid; > > ctx->key_algo = ctx->last_oid; > switch (ctx->last_oid) { > @@ -470,7 +471,16 @@ int x509_extract_key_data(void *context, size_t hdrlen, > ctx->cert->pub->pkey_algo = "ecrdsa"; > break; > case OID_id_ecPublicKey: > - ctx->cert->pub->pkey_algo = "sm2"; > + if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) > + return -EBADMSG; > + > + switch (oid) { > + case OID_sm2: > + ctx->cert->pub->pkey_algo = "sm2"; > + break; > + default: > + return -ENOPKG; > + } > break; > default: > return -ENOPKG; > diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h > index 4462ed2c18cd..d4982e42c0d2 100644 > --- a/include/linux/oid_registry.h > +++ b/include/linux/oid_registry.h > @@ -117,6 +117,7 @@ enum OID { > }; > > extern enum OID look_up_OID(const void *data, size_t datasize); > +extern int parse_OID(const void *data, size_t datasize, enum OID *oid); > extern int sprint_oid(const void *, size_t, char *, size_t); > extern int sprint_OID(enum OID, char *, size_t); > > diff --git a/lib/oid_registry.c b/lib/oid_registry.c > index f7ad43f28579..508e0b34b5f0 100644 > --- a/lib/oid_registry.c > +++ b/lib/oid_registry.c > @@ -11,6 +11,7 @@ > #include <linux/kernel.h> > #include <linux/errno.h> > #include <linux/bug.h> > +#include <linux/asn1.h> > #include "oid_registry_data.c" > > MODULE_DESCRIPTION("OID Registry"); > @@ -92,6 +93,18 @@ enum OID look_up_OID(const void *data, size_t datasize) > } > EXPORT_SYMBOL_GPL(look_up_OID); > > +int parse_OID(const void *data, size_t datasize, enum OID *oid) > +{ > + const unsigned char *v = data; > + > + if (datasize < 2 || v[0] != ASN1_OID || v[1] != datasize - 2) > + return -EBADMSG; > + > + *oid = look_up_OID(data + 2, datasize - 2); > + return 0; > +} > +EXPORT_SYMBOL_GPL(parse_OID); > + > /* > * sprint_OID - Print an Object Identifier into a buffer > * @data: The encoded OID to print > Great job, I'm just curious why we need to add a new function, this seems unnecessary, if possible, please add Reviewed-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> Best regards, Tianjia
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 52c9b455fc7d..1621ceaf5c95 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -459,6 +459,7 @@ int x509_extract_key_data(void *context, size_t hdrlen, const void *value, size_t vlen) { struct x509_parse_context *ctx = context; + enum OID oid; ctx->key_algo = ctx->last_oid; switch (ctx->last_oid) { @@ -470,7 +471,16 @@ int x509_extract_key_data(void *context, size_t hdrlen, ctx->cert->pub->pkey_algo = "ecrdsa"; break; case OID_id_ecPublicKey: - ctx->cert->pub->pkey_algo = "sm2"; + if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) + return -EBADMSG; + + switch (oid) { + case OID_sm2: + ctx->cert->pub->pkey_algo = "sm2"; + break; + default: + return -ENOPKG; + } break; default: return -ENOPKG; diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h index 4462ed2c18cd..d4982e42c0d2 100644 --- a/include/linux/oid_registry.h +++ b/include/linux/oid_registry.h @@ -117,6 +117,7 @@ enum OID { }; extern enum OID look_up_OID(const void *data, size_t datasize); +extern int parse_OID(const void *data, size_t datasize, enum OID *oid); extern int sprint_oid(const void *, size_t, char *, size_t); extern int sprint_OID(enum OID, char *, size_t); diff --git a/lib/oid_registry.c b/lib/oid_registry.c index f7ad43f28579..508e0b34b5f0 100644 --- a/lib/oid_registry.c +++ b/lib/oid_registry.c @@ -11,6 +11,7 @@ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/bug.h> +#include <linux/asn1.h> #include "oid_registry_data.c" MODULE_DESCRIPTION("OID Registry"); @@ -92,6 +93,18 @@ enum OID look_up_OID(const void *data, size_t datasize) } EXPORT_SYMBOL_GPL(look_up_OID); +int parse_OID(const void *data, size_t datasize, enum OID *oid) +{ + const unsigned char *v = data; + + if (datasize < 2 || v[0] != ASN1_OID || v[1] != datasize - 2) + return -EBADMSG; + + *oid = look_up_OID(data + 2, datasize - 2); + return 0; +} +EXPORT_SYMBOL_GPL(parse_OID); + /* * sprint_OID - Print an Object Identifier into a buffer * @data: The encoded OID to print
Detect whether a key is an sm2 type of key by its OID in the parameters array rather than assuming that everything under OID_id_ecPublicKey is sm2, which is not the case. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Cc: David Howells <dhowells@redhat.com> Cc: keyrings@vger.kernel.org --- crypto/asymmetric_keys/x509_cert_parser.c | 12 +++++++++++- include/linux/oid_registry.h | 1 + lib/oid_registry.c | 13 +++++++++++++ 3 files changed, 25 insertions(+), 1 deletion(-)