Used maximum password request tries.

Issue #913

Author: joke325

src/rnp/fficli.cpp

@@ -252,6 +252,7 @@ ffi_pass_callback_stdin(rnp_ffi_t        ffi,
     char       buffer[MAX_PASSWORD_LENGTH];
     bool       ok = false;
     cli_rnp_t *rnp = static_cast<cli_rnp_t *>(app_ctx);
+    int        pswdtries = 1;
 
     if (!ffi || !pgp_context) {
         goto done;
@@ -286,9 +287,13 @@ ffi_pass_callback_stdin(rnp_ffi_t        ffi,
             goto done;
         }
         if (strcmp(buf, buffer) != 0) {
-            fputs("\nPasswords do not match!", rnp->userio_out);
-            // currently will loop forever
-            goto start;
+            fputs("\nPasswords do not match!\n", rnp->userio_out);
+            fflush(rnp->userio_out);
+            if (rnp->pswdtries > 0 && ++pswdtries > rnp->pswdtries) {
+                goto done;
+            } else {
+                goto start;
+            }
         }
     }
     ok = true;

src/rnp/rnpcfg.cpp

@@ -486,10 +486,10 @@ rnp_cfg_get_pswdtries(const rnp_cfg_t *cfg)
 
     numtries = rnp_cfg_getstr(cfg, CFG_NUMTRIES);
 
-    if ((numtries == NULL) || ((num = atoi(numtries)) <= 0)) {
-        return MAX_PASSWORD_ATTEMPTS;
-    } else if (strcmp(numtries, "unlimited")) {
+    if (numtries != NULL && !strcmp(numtries, "unlimited")) {
         return INFINITE_ATTEMPTS;
+    } else if ((numtries == NULL) || ((num = atoi(numtries)) <= 0)) {
+        return MAX_PASSWORD_ATTEMPTS;
     } else {
         return num;
     }