Support broken PKCS#12 key generation.

OpenSSL versions before 1.1.0 didn't convert non-ASCII
UTF8 PKCS#12 passwords to Unicode correctly.

To correctly decrypt older files, if MAC verification fails
with the supplied password attempt to use the broken format
which is compatible with earlier versions of OpenSSL.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 23 insertions, 4 deletions

diff --git a/apps/pkcs12.c b/apps/pkcs12.c
index f8806b9a6a..93489d6a56 100644
--- a/apps/pkcs12.c
+++ b/apps/pkcs12.c
@@ -132,7 +132,7 @@ int pkcs12_main(int argc, char **argv)
     int noprompt = 0;
     char *passinarg = NULL, *passoutarg = NULL, *passarg = NULL;
     char *passin = NULL, *passout = NULL, *inrand = NULL, *macalg = NULL;
-    char *cpass = NULL, *mpass = NULL;
+    char *cpass = NULL, *mpass = NULL, *badpass = NULL;
     const char *CApath = NULL, *CAfile = NULL, *prog;
     int noCApath = 0, noCAfile = 0;
     ENGINE *e = NULL;
@@ -539,9 +539,27 @@ int pkcs12_main(int argc, char **argv)
             if (!twopass)
                 cpass = NULL;
         } else if (!PKCS12_verify_mac(p12, mpass, -1)) {
-            BIO_printf(bio_err, "Mac verify error: invalid password?\n");
-            ERR_print_errors(bio_err);
-            goto end;
+            /*
+             * May be UTF8 from previous version of OpenSSL:
+             * convert to a UTF8 form which will translate
+             * to the same Unicode password.
+             */
+            unsigned char *utmp;
+            int utmplen;
+            utmp = OPENSSL_asc2uni(mpass, -1, NULL, &utmplen);
+            if (utmp == NULL)
+                goto end;
+            badpass = OPENSSL_uni2utf8(utmp, utmplen);
+            OPENSSL_free(utmp);
+            if (!PKCS12_verify_mac(p12, badpass, -1)) {
+                BIO_printf(bio_err, "Mac verify error: invalid password?\n");
+                ERR_print_errors(bio_err);
+                goto end;
+            } else {
+                BIO_printf(bio_err, "Warning: using broken algorithm\n");
+                if (!twopass)
+                    cpass = badpass;
+            }
         }
     }
 
@@ -559,6 +577,7 @@ int pkcs12_main(int argc, char **argv)
     BIO_free(in);
     BIO_free_all(out);
     sk_OPENSSL_STRING_free(canames);
+    OPENSSL_free(badpass);
     OPENSSL_free(passin);
     OPENSSL_free(passout);
     return (ret);