Update lumina-checkpass with 2 additional options:

1. "-fd <file descriptor>" pass in a file descriptor (such as 0 for standard input) to read password
2. "-f <file path>" pass in a file path to read the password

Then update lumina-desktop-unified to use the "-f" version with a QTemporaryFile.
I was trying to get it to use the "-fd" version, but the file descriptor I am getting from the QTemporaryFile does not seem to work properly - still need to track this down a bit more later but the -f option works fine for now.

3 files changed, 47 insertions, 6 deletions

diff --git a/src-qt5/core/lumina-checkpass/main.c b/src-qt5/core/lumina-checkpass/main.c
index e12e7c78..481cce33 100644
--- a/src-qt5/core/lumina-checkpass/main.c
+++ b/src-qt5/core/lumina-checkpass/main.c
@@ -14,23 +14,52 @@
 //===========================================
 //Standard C libary
 #include <unistd.h>	// Standard C
+#include <stdlib.h>
 #include <stdio.h> 	// Usage output
 #include <pwd.h>  		// User DB information
+#include <string.h>
 
 //PAM/security libraries
 #include <sys/types.h>
 #include <security/pam_appl.h>
 #include <security/openpam.h>
 
+void showUsage(){
+    puts("lumina-checkpass: Simple user-level check for password validity (for screen unlockers and such).");
+    puts("Usage:");
+    puts("  lumina-checkpass <password>");
+    puts("  lumina-checkpass -fd <file descriptor>");
+    puts("  lumina-checkpass -f <file path>");
+    puts("Returns: 0 for a valid password, 1 for invalid");
+}
+
 int main(int argc, char** argv){
   //Check the inputs
-  if(argc!=2){
+  if(argc<2){
     //Invalid inputs - show the help text
-    puts("lumina-checkpass: Simple user-level check for password validity (for screen unlockers and such).");
-    puts("Usage: lumina-checkpass <password>");
-    puts("Returns: 0 for a valid password, 1 for invalid");
+    showUsage();
     return 1;
   }
+  char*pass = 0;
+  if(argc==2){ pass = argv[1]; }
+  else if(argc==3 && 0==strcmp(argv[1],"-fd") ){
+    FILE *fp = fdopen(atoi(argv[2]), "r");
+    size_t len;
+    if(fp!=0){
+      ssize_t slen = getline(&pass, &len, fp);
+      if(pass[slen-1]=='\n'){ pass[slen-1] = '\0'; }
+    }
+    fclose(fp);
+  }else if(argc==3 && 0==strcmp(argv[1],"-f") ){
+    FILE *fp = fopen(argv[2], "r");
+    size_t len;
+    if(fp!=0){
+      ssize_t slen = getline(&pass, &len, fp);
+      if(pass[slen-1]=='\n'){ pass[slen-1] = '\0'; }
+    }
+    fclose(fp);
+  }
+  if(pass == 0){ puts("Could not read password!!"); return 1; } //error in reading password
   //Validate current user (make sure current UID matches the logged-in user,
   char* cUser = getlogin();
   struct passwd *pwd = 0;
@@ -44,7 +73,7 @@ int main(int argc, char** argv){
     int ret = pam_start( "system", cUser, &pamc, &pamh);
     if(ret != PAM_SUCCESS){ return 1; } //could not init PAM
     //char* cPassword = argv[1];
-    ret = pam_set_item(pamh, PAM_AUTHTOK, argv[1]);
+    ret = pam_set_item(pamh, PAM_AUTHTOK, pass);
     //Authenticate with PAM
     ret = pam_authenticate(pamh,0); //this can be true without verifying password if pam_self.so is used in the auth procedures (common)
     if( ret == PAM_SUCCESS ){ ret = pam_acct_mgmt(pamh,0); } //Check for valid, unexpired account and verify access restrictions
diff --git a/src-qt5/core/lumina-desktop-unified/global-includes.h b/src-qt5/core/lumina-desktop-unified/global-includes.h
index ba1beb06..ae57ac08 100644
--- a/src-qt5/core/lumina-desktop-unified/global-includes.h
+++ b/src-qt5/core/lumina-desktop-unified/global-includes.h
@@ -19,6 +19,7 @@
 #include <QMouseEvent>
 #include <QAction>
 #include <QPoint>
+#include <QTemporaryFile>
 #include <QFile>
 #include <QDir>
 #include <QString>
diff --git a/src-qt5/core/lumina-desktop-unified/src-screensaver/LLockScreen.cpp b/src-qt5/core/lumina-desktop-unified/src-screensaver/LLockScreen.cpp
index 0ff70142..b791ffd2 100644
--- a/src-qt5/core/lumina-desktop-unified/src-screensaver/LLockScreen.cpp
+++ b/src-qt5/core/lumina-desktop-unified/src-screensaver/LLockScreen.cpp
@@ -77,7 +77,18 @@ void LLockScreen::TryUnlock(){
   this->setEnabled(false);
   QString pass = ui->line_password->text();
     ui->line_password->clear();
-  bool ok = (LUtils::runCmd("lumina-checkpass", QStringList() << pass) == 0);
+  //Create a temporary file for the password, then pass that file descriptor to lumina-checkpass
+  QTemporaryFile *TF = new QTemporaryFile(".XXXXXXXXXX");
+  TF->setAutoRemove(true);
+  bool ok = false;
+  if( TF->open() ){
+    QTextStream in(TF);
+    in << pass;
+    in.flush(); //make sure we push it to the file **right now** since we need to keep the file open
+    ok = (LUtils::runCmd("lumina-checkpass", QStringList() << "-f" << TF->fileName() ) == 0);
+    TF->close();
+  }
+  delete TF;
   if(ok){
     emit ScreenUnlocked();
     this->setEnabled(true);