File relax-ssh-password-prompt-recognition.patch of Package lftp.18123

Overview Repositories Revisions Requests Users Attributes Meta

File relax-ssh-password-prompt-recognition.patch of Package lftp.18123

From 0bcd1d2d6bfb9d5397c34433ddb62a9b92eba27b Mon Sep 17 00:00:00 2001
From: Peter Simons <psimons@suse.com>
Date: Wed, 27 Feb 2019 10:09:27 +0100
Subject: [PATCH] SSH_Access: be more liberal about recognizing password
 prompts

A SUSE customer reported an issue where the use of a 3rd party
PAM module in stack changed the password prompt to:

UNIXADS password for username:

Unfortunately, the ssh parsing code in lftp does not recognize
this as a password prompt, which means that the login process
gets stuck.

We have found that accepting all strings that contain the phrase
"password" and end in a colon works very well and it also covers
this particular case.
---
 src/SSH_Access.cc | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

Index: lftp-4.8.4/src/SSH_Access.cc
===================================================================
--- lftp-4.8.4.orig/src/SSH_Access.cc	2019-03-19 12:26:52.246752720 +0000
+++ lftp-4.8.4/src/SSH_Access.cc	2019-03-19 12:27:10.578919458 +0000
@@ -20,6 +20,9 @@
 #include <config.h>
 #include "SSH_Access.h"
 #include "misc.h"
+#include <algorithm>
+#include <cctype>
+#include <string>
 
 void SSH_Access::MakePtyBuffers()
 {
@@ -44,6 +47,18 @@ static bool begins_with(const char *b,co
    return (e-b>=len && !strncasecmp(b,suffix,len));
 }
 
+static bool contains(char const * begin, char const * end, std::string const & needle)
+{
+   struct nocase_eq
+   {
+      inline bool operator() (char lhs, char rhs) const
+      {
+         return std::tolower(lhs) == std::tolower(rhs);
+      };
+   };
+   return std::search(begin, end, needle.begin(), needle.end(), nocase_eq()) != end;
+}
+
 int SSH_Access::HandleSSHMessage()
 {
    int m=STALL;
@@ -55,9 +70,7 @@ int SSH_Access::HandleSSHMessage()
    {
       if(s>0 && b[s-1]==' ')
 	 s--;
-      if(ends_with(b,b+s,"password:")
-      || (ends_with(b,b+s,"':") && s>10)
-      || (begins_with(b,b+s,"password for ") && b[s-1]==':'))
+      if((contains(b,b+s,"password") && b[s-1]==':'))
       {
 	 if(!pass)
 	 {

Places

File relax-ssh-password-prompt-recognition.patch of Package lftp.18123

Places