STORE: Fix OSSL_STORE_open_ex() error reporting

OSSL_STORE_open_ex() could result in reports like this:

    80722AA3927F0000:error:80000002:system library:file_open_ex:No such file or directory:engines/e_loader_attic.c:1016:calling stat(file:test/blahdibleh.der)
    80722AA3927F0000:error:41800069:lib(131)::path must be absolute:engines/e_loader_attic.c:1010:test/blahdibleh.der
    80722AA3927F0000:error:1600007B:STORE routines:OSSL_STORE_open_ex:no loaders found:crypto/store/store_lib.c:148:No store loaders were found. For standard store loaders you need at least one of the default or base providers available. Did you forget to load them?

The last one turns out to be a bit too generically reported.  It
should only be reported when no loader were loaded at all, not when
loader_ctx happens to be NULL (which may happen for other reasons).

We also move the helpful message to the OSSL_STORE_LOADER fetcher.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15820)

diff --git a/crypto/store/store_lib.c b/crypto/store/store_lib.c
index c0d9dafbdf38cd2800def240ffe293d8f501d062..4b31c6f7d5f76ce797cd96328879437f7e9cb57e 100644 (file)
--- a/crypto/store/store_lib.c
+++ b/crypto/store/store_lib.c
@@ -71,6 +71,7 @@ OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
     OSSL_STORE_LOADER_CTX *loader_ctx = NULL;
     OSSL_STORE_CTX *ctx = NULL;
     char *propq_copy = NULL;
+    int no_loader_found = 1;
     char scheme_copy[256], *p, *schemes[2];
     size_t schemes_n = 0;
     size_t i;
@@ -113,6 +114,7 @@ OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
         OSSL_TRACE1(STORE, "Looking up scheme %s\n", schemes[i]);
 #ifndef OPENSSL_NO_DEPRECATED_3_0
         if ((loader = ossl_store_get0_loader_int(schemes[i])) != NULL) {
+            no_loader_found = 0;
             if (loader->open_ex != NULL)
                 loader_ctx = loader->open_ex(loader, uri, libctx, propq,
                                              ui_method, ui_data);
@@ -127,6 +129,7 @@ OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
                 OSSL_STORE_LOADER_get0_provider(fetched_loader);
             void *provctx = OSSL_PROVIDER_get0_provider_ctx(provider);
 
+            no_loader_found = 0;
             loader_ctx = fetched_loader->p_open(provctx, uri);
             if (loader_ctx == NULL) {
                 OSSL_STORE_LOADER_free(fetched_loader);
@@ -141,16 +144,21 @@ OSSL_STORE_open_ex(const char *uri, OSSL_LIB_CTX *libctx, const char *propq,
         }
     }
 
-    if (loader != NULL)
-        OSSL_TRACE1(STORE, "Found loader for scheme %s\n", schemes[i]);
+    if (no_loader_found)
+        /*
+         * It's assumed that ossl_store_get0_loader_int() and
+         * OSSL_STORE_LOADER_fetch() report their own errors
+         */
+        goto err;
 
-    if (loader_ctx == NULL) {
-        ERR_raise_data(ERR_LIB_OSSL_STORE, OSSL_STORE_R_NO_LOADERS_FOUND,
-                       "No store loaders were found. For standard store "
-                       "loaders you need at least one of the default or base "
-                       "providers available. Did you forget to load them?");
+    OSSL_TRACE1(STORE, "Found loader for scheme %s\n", schemes[i]);
+
+    if (loader_ctx == NULL)
+        /*
+         * It's assumed that the loader's open() method reports its own
+         * errors
+         */
         goto err;
-    }
 
     OSSL_TRACE2(STORE, "Opened %s => %p\n", uri, (void *)loader_ctx);
 

diff --git a/crypto/store/store_meth.c b/crypto/store/store_meth.c
index e316f4f139c91fbdc61e14540b0d5cc678450bfe..61230a6c241d878f27bfae7a974ca6b7a1cbcb56 100644 (file)
--- a/crypto/store/store_meth.c
+++ b/crypto/store/store_meth.c
@@ -344,11 +344,18 @@ inner_loader_fetch(struct loader_data_st *methdata, int id,
 
     if ((id != 0 || scheme != NULL) && method == NULL) {
         int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;
+        const char *helpful_msg =
+            unsupported
+            ? ( "No store loader found. For standard store loaders you need "
+                "at least one of the default or base providers available. "
+                "Did you forget to load them? Info: " )
+            : "";
 
         if (scheme == NULL)
             scheme = ossl_namemap_num2name(namemap, id, 0);
         ERR_raise_data(ERR_LIB_OSSL_STORE, code,
-                       "%s, Scheme (%s : %d), Properties (%s)",
+                       "%s%s, Scheme (%s : %d), Properties (%s)",
+                       helpful_msg,
                        ossl_lib_ctx_get_descriptor(methdata->libctx),
                        scheme = NULL ? "<null>" : scheme, id,
                        properties == NULL ? "<null>" : properties);