gate calling of evp_method_id on having a non-zero name id

If a name is passed to EVP_<OBJ>_fetch of the form:
name1:name2:name3

The names are parsed on the separator ':' and added to the store, but
during the lookup in inner_evp_generic_fetch, the subsequent search of
the store uses the full name1:name2:name3 string, which fails lookup,
and causes subsequent assertion failures in evp_method_id.

instead catch the failure in inner_evp_generic_fetch and return an error
code if the name_id against a colon separated list of names fails.  This
provides a graceful error return path without asserts, and leaves room
for a future feature in which such formatted names can be parsed and
searched for iteratively

Add a simple test to verify that providing a colon separated name
results in an error indicating an invalid lookup.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/23110)

1 files changed, 17 insertions, 4 deletions

diff --git a/crypto/evp/evp_fetch.c b/crypto/evp/evp_fetch.c
index c643ae8f9a..bd816be5f4 100644
--- a/crypto/evp/evp_fetch.c
+++ b/crypto/evp/evp_fetch.c
@@ -318,13 +318,26 @@ inner_evp_generic_fetch(struct evp_method_data_st *methdata,
              * there is a correct name_id and meth_id, since those have
              * already been calculated in get_evp_method_from_store() and
              * put_evp_method_in_store() above.
+             * Note that there is a corner case here, in which, if a user
+             * passes a name of the form name1:name2:..., then the construction
+             * will create a method against all names, but the lookup will fail
+             * as ossl_namemap_name2num treats the name string as a single name
+             * rather than introducing new features where in the EVP_<obj>_fetch
+             * parses the string and querys for each, return an error.
              */
             if (name_id == 0)
                 name_id = ossl_namemap_name2num(namemap, name);
-            meth_id = evp_method_id(name_id, operation_id);
-            if (name_id != 0)
-                ossl_method_store_cache_set(store, prov, meth_id, propq,
-                                            method, up_ref_method, free_method);
+            if (name_id == 0) {
+                ERR_raise_data(ERR_LIB_EVP, ERR_R_FETCH_FAILED,
+                               "Algorithm %s cannot be found", name);
+                free_method(method);
+                method = NULL;
+            } else {
+                meth_id = evp_method_id(name_id, operation_id);
+                if (name_id != 0)
+                    ossl_method_store_cache_set(store, prov, meth_id, propq,
+                                                method, up_ref_method, free_method);
+            }
         }
 
         /*