To verify MAC, we need a MAC

Fixes #26106

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26140)

apps/pkcs12.c

@@ -829,6 +829,12 @@ int pkcs12_main(int argc, char **argv)
         const ASN1_OBJECT *macobj;
 
         PKCS12_get0_mac(NULL, &macalgid, NULL, NULL, p12);
+
+        if (macalgid == NULL) {
+            BIO_printf(bio_err, "Warning: MAC is absent!\n");
+            goto dump;
+        }
+
         X509_ALGOR_get0(&macobj, NULL, NULL, macalgid);
 
         if (OBJ_obj2nid(macobj) != NID_pbmac1) {

test/recipes/80-test_pkcs12.t

@@ -56,7 +56,7 @@ $ENV{OPENSSL_WIN32_UTF8}=1;
 
 my $no_fips = disabled('fips') || ($ENV{NO_FIPS} // 0);
 
-plan tests => $no_fips ? 46 : 52;
+plan tests => $no_fips ? 47 : 53;
 
 # Test different PKCS#12 formats
 ok(run(test(["pkcs12_format_test"])), "test pkcs12 formats");
@@ -288,6 +288,13 @@ with({ exit_checker => sub { return shift == 1; } },
            "test bad pkcs12 file 3 (info)");
      });
 
+# Test that mac verification doesn't fail when mac is absent in the file
+{
+    my $nomac = srctop_file("test", "recipes", "80-test_pkcs12_data", "nomac_parse.p12");
+    ok(run(app(["openssl", "pkcs12", "-in", $nomac, "-passin", "pass:testpassword"])),
+       "test pkcs12 file without MAC");
+}
+
 # Test with Oracle Trusted Key Usage specified in openssl.cnf
 {
     ok(run(app(["openssl", "pkcs12", "-export", "-out", $outfile7,