From 91ee62834428e9fd0d43e5783a269b2f65460012 Mon Sep 17 00:00:00 2001
From: "David M. Syzdek" <david@syzdek.net>
Date: Fri, 3 Jun 2022 15:59:14 -0800
Subject: tacacs-example: replacing getpass() with my_getpass()

---
 examples/tacacs-example.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

(limited to 'examples')

diff --git a/examples/tacacs-example.c b/examples/tacacs-example.c
index f301d6a..1f08e33 100644
--- a/examples/tacacs-example.c
+++ b/examples/tacacs-example.c
@@ -57,6 +57,13 @@
 #include <pwd.h>
 #include <unistd.h>
 
+#ifdef HAVE_TERMIOS_H
+#   include <termios.h>
+#endif
+#ifdef HAVE_SGTTY_H
+#   include <sgtty.h>
+#endif
+
 
 ///////////////////
 //               //
@@ -268,6 +275,11 @@ my_error(
          ... );
 
 
+char *
+my_getpass(
+         const char *                  prompt );
+
+
 char *
 my_ntop(
          struct sockaddr_storage *     sa,
@@ -504,7 +516,7 @@ my_cmd_authen(
    assert(user   != NULL);
    assert(pass   != NULL);
 
-   str = getpass("Enter password: ");
+   str = my_getpass("Enter password: ");
    strncpy(pass, str, sizeof(pass));
    pass[sizeof(pass)-1] = '\0';
 
@@ -824,6 +836,65 @@ my_error(
 }
 
 
+char *
+my_getpass(
+         const char *                  prompt )
+{
+   FILE         * fs;
+   int            c;
+   size_t         pos;
+   static char    pass[512];
+   size_t         passlen;
+#if defined(HAVE_TERMIOS_H) || defined(HAVE_SGTTY_H)
+   struct termios old;
+   struct termios new;
+   void          (*sig)( int sig );
+#endif
+
+   passlen = sizeof(pass);
+
+   // prompts for password
+   prompt = ((prompt)) ? prompt : "Password: ";
+   if (prompt)
+      fprintf(stderr, "%s", prompt);
+   fflush(stdout);
+
+   // disables ECHO
+#if defined(HAVE_TERMIOS_H) || defined(HAVE_SGTTY_H)
+   if ((fs = fopen("/dev/tty", "r")) == NULL)
+      fs = stdin;
+   if(tcgetattr(fileno(fs), &old) == -1)
+      return(NULL);
+   sig          = signal(SIGINT, SIG_IGN);
+   new          = old;
+   new.c_lflag &= ~((unsigned)ECHO);
+   if(tcsetattr(fileno(fs), TCSANOW, &new))
+      return(NULL);
+#else
+   fs = stdin;
+#endif
+
+   // reads buffer
+   pos = 0;
+   while ( ((c = getc(fs)) != EOF) && (c != '\n') && (c != '\r') )
+      if (pos < (passlen-1))
+         pass[pos++] = (char)c;
+   pass[pos] = '\0';
+
+   // restores previous terminal
+   fprintf(stderr, "\n");
+#if defined(HAVE_TERMIOS_H) || defined(HAVE_SGTTY_H)
+   fflush(stderr);
+   if(tcsetattr(fileno(fs), TCSANOW, &old))
+      return(NULL);
+   signal(SIGINT, sig);
+   fclose(fs);
+#endif
+
+   return(pass);
+}
+
+
 char *
 my_ntop(
          struct sockaddr_storage *     sa,
-- 
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