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Use the right NID when putting a method in the store 

When we attempt to fetch a method with a given NID we will ask the
providers for it if we don't already know about it. During that process
we may be told about other methods with a different NID. We need to
make sure we don't confuse the two.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8541)
This commit is contained in:
Matt Caswell 2019-03-20 17:51:29 +00:00
parent 68ca1737ce
commit dc46e3dde5
7 changed files with 43 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
crypto/core_fetch.c
View File

@ -35,8 +35,9 @@ static int ossl_method_construct_this(OSSL_PROVIDER *provider, void *cbdata)
const OSSL_ALGORITHM *thismap = map++;
void *method = NULL;
if ((method = data->mcm->construct(thismap->implementation, provider,
data->mcm_data)) == NULL)
if ((method = data->mcm->construct(thismap->algorithm_name,
thismap->implementation, provider,
data->mcm_data)) == NULL)
continue;
/*

9
crypto/evp/digest.c
View File

@ -585,10 +585,17 @@ static void evp_md_free(void *md)
EVP_MD_meth_free(md);
}
static int evp_md_nid(void *vmd)
{
EVP_MD *md = vmd;
return md->type;
}
EVP_MD *EVP_MD_fetch(OPENSSL_CTX *ctx, const char *algorithm,
const char *properties)
{
return evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
evp_md_from_dispatch, evp_md_upref,
evp_md_free);
evp_md_free, evp_md_nid);
}

27
crypto/evp/evp_fetch.c
View File

@ -62,6 +62,7 @@ struct method_data_st {
OSSL_PROVIDER *);
int (*refcnt_up_method)(void *method);
void (*destruct_method)(void *method);
int (*nid_method)(void *method);
};
/*
@ -106,29 +107,35 @@ static void *get_method_from_store(OPENSSL_CTX *libctx, void *store,
}
static int put_method_in_store(OPENSSL_CTX *libctx, void *store,
const char *propdef, void *method,
void *data)
const char *propdef,
void *method, void *data)
{
struct method_data_st *methdata = data;
int nid = methdata->nid_method(method);
if (nid == NID_undef)
return 0;
if (store == NULL
&& (store = get_default_method_store(libctx)) == NULL)
return 0;
if (methdata->refcnt_up_method(method)
&& ossl_method_store_add(store, methdata->nid, propdef, method,
&& ossl_method_store_add(store, nid, propdef, method,
methdata->destruct_method))
return 1;
return 0;
}
static void *construct_method(const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
static void *construct_method(const char *algorithm_name,
const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
void *data)
{
struct method_data_st *methdata = data;
void *method = NULL;
int nid = OBJ_sn2nid(algorithm_name);
if (methdata->nid == NID_undef) {
if (nid == NID_undef) {
/* Create a new NID for that name on the fly */
ASN1_OBJECT tmpobj;
@ -139,13 +146,13 @@ static void *construct_method(const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
tmpobj.length = 0;
tmpobj.data = NULL;
methdata->nid = OBJ_add_object(&tmpobj);
nid = OBJ_add_object(&tmpobj);
}
if (methdata->nid == NID_undef)
if (nid == NID_undef)
return NULL;
method = methdata->method_from_dispatch(methdata->nid, fns, prov);
method = methdata->method_from_dispatch(nid, fns, prov);
if (method == NULL)
return NULL;
return method;
@ -163,7 +170,8 @@ void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
void *(*new_method)(int nid, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*upref_method)(void *),
void (*free_method)(void *))
void (*free_method)(void *),
int (*nid_method)(void *))
{
int nid = OBJ_sn2nid(algorithm);
void *method = NULL;
@ -186,6 +194,7 @@ void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
mcmdata.destruct_method = free_method;
mcmdata.refcnt_up_method = upref_method;
mcmdata.destruct_method = free_method;
mcmdata.nid_method = nid_method;
method = ossl_method_construct(libctx, operation_id, algorithm,
properties, 0 /* !force_cache */,
&mcm, &mcmdata);

3
crypto/evp/evp_locl.h
View File

@ -90,4 +90,5 @@ void *evp_generic_fetch(OPENSSL_CTX *ctx, int operation_id,
void *(*new_method)(int nid, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*upref_method)(void *),
void (*free_method)(void *));
void (*free_method)(void *),
int (*nid_method)(void *));

7
doc/internal/man3/evp_generic_fetch.pod
View File

@ -14,7 +14,8 @@ evp_generic_fetch - generic algorithm fetcher and method creator for EVP
void *(*new_method)(int nid, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*upref_method)(void *),
void (*free_method)(void *));
void (*free_method)(void *),
int (*nid_method)(void *));
=head1 DESCRIPTION
@ -41,6 +42,10 @@ one.
frees the given method.
=item nid_method()
returns the nid associated with the given method.
=back
=head1 RETURN VALUES

7
doc/internal/man3/ossl_method_construct.pod
View File

@ -21,8 +21,8 @@ OSSL_METHOD_CONSTRUCT_METHOD, ossl_method_construct
int (*put)(OPENSSL_CTX *libctx, void *store, const char *propdef,
void *method, void *data);
/* Construct a new method */
void *(*construct)(const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
void *data);
void *(*construct)(const char *algorithm_name, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov, void *data);
/* Destruct a method */
void (*destruct)(void *method);
};
@ -107,7 +107,8 @@ This function is expected to increment the C<method>'s reference count.
=item construct()
Constructs a sub-system method given a dispatch table C<fns>.
Constructs a sub-system method for the given C<algorithm_name> and the given
dispatch table C<fns>.
The associated I<provider object> C<prov> is passed as well, to make
it possible for the sub-system constructor to keep a reference, which

4
include/internal/core.h
View File

@ -38,8 +38,8 @@ typedef struct ossl_method_construct_method_st {
int (*put)(OPENSSL_CTX *libctx, void *store, const char *propdef,
void *method, void *data);
/* Construct a new method */
void *(*construct)(const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
void *data);
void *(*construct)(const char *algorithm_name, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov, void *data);
/* Destruct a method */
void (*destruct)(void *method, void *data);
} OSSL_METHOD_CONSTRUCT_METHOD;