Ftp linux permission denied

Ubuntu — FTP file edit permission denied

I have been trying to make an Unturned server for my friends, and I cannot edit ANY files in it.

What I’ve Tried:

I can’t delete or upload to the FTP server; when I try to change the file permissions, it denies it.

I have changed the write_enable=NO to write_enable=YES in /etc/vsftpd.conf but it didn’t help. I cannot edit the permissions from the FTP server.

Researching the web for answers, but I cannot find anything on this anywhere on the internet.

Other Details:

• I am using FileZilla for FTP services.

Goal:

I want to make it so anyone that can see the folder can edit it, and not just the terminal user.

If anyone can help me that would be great.

1 Answer 1

-Solution-

Solving this took me some time but I finally figured it out. You must first, login to the account you want on FTP (On a local network you may leave the port blank). If you can access the files, you are fine. Next, open a terminal connection to the Ubuntu Server itself. Once you have done so, login to an account with sudo permissions. You must then change the owner of the file. I suggest giving the user ownership of Everything in order to ensure full access. First, run cd

to change the seclected folder, then sudo chown -R [User’s Username]:root /home/[username] . That should change the owner of the folder to the specified user along with all the files inside the folder. If you want to change ownership of just a specific file, run sudo chown [User’s Username]:root [Directory (example: /home/user/folder/document.txt)]

-Flat out Instructions-

Login to the user (Sudo permissions required), run cd

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Ubuntu 19:10 — ftp: setsockopt (ignored): Permission denied (connecting to FTP server in active mode)

I’m currently running Ubuntu 19:10 as my primary operating system. I need to connect to an FTP server where the connection needs to be in active mode. I have tried this with Filezilla by enabling active ftp and also via the command line.

I can connect to the FTP server, however, when running it in debug mode by passing the -d flag to the ftp command, I am met with errors when attempting to list files.

Here is a screenshot of my terminal window:

Probably worth mentioning I can successfully run pwd and I can change directories with cd given I already know the name of two directories.

The first error I see is this:

ftp: setsockopt: Bad file descriptor

ftp: setsockopt (ignored): Permission denied

500 Illegal PORT command

ftp: bind: Address already in use

From doing a lot of googling I saw a variety of suggestions such as enabling passive mode, and checking my firewall. However, when enabling passive mode I am met with the following problem:

Likewise, I’ve verified that UFW is inactive from running:

sudo ufw status

I’ve also checked that there is nothing blocked in iptables . I can connect to a regular FTP server in passive mode without issue. This is the first time I’ve been required to use active mode when connecting.

The question I therefore have is in two parts:

1. Is this likely to be an issue with my end (the client) or the FTP server?

2. If it is an issue on my end, what can I try to fix it?

Any help will be much appreciated!

1 Answer 1

The FTP protocol, written before today’s concept of firewall existed is quite complex: while the client connects to the server for commands, for data transfers (including the output of the LIST command, but not the output of the PWD command which is directly in the command connection) in so-called active mode that is the server which initiates the connection (usually from port 20, to a random port chosen by the client).

All this makes it difficult for «dumb» firewalls to let FTP work with the PORT command. The PASV command instead makes the client initiate connections twice to the server: one for command and one for every data transfer. But the difficulty is now reversed: that’s the server’s firewall side which must cope with the random port chosen by the server when transmitting the PASV command’s answer containing the IP and port.

What’s the result for you?

you stated that you can’t use passive mode: that usually means the FTP’s server side is behind a restrictive (local or on the network path) firewall which has no configuration to allow the FTP server to open temporary random listening ports corresponding to the output of the PASV command.

for active mode:

I noticed that the PORT command’s address you’re using is in the 100.64.0.0/10 network which is in RFC 6598:

This document requests the allocation of an IPv4 /10 address block to be used as Shared Address Space to accommodate the needs of Carrier-Grade NAT (CGN) devices.

o routing information about Shared Address Space networks MUST NOT be propagated across Service Provider boundaries. Service Providers MUST filter incoming advertisements regarding Shared Address Space.

o packets with Shared Address Space source or destination addresses MUST NOT be forwarded across Service Provider boundaries. Service Providers MUST filter such packets on ingress links.

That’s the probable reason the server returns 500 Illegal PORT command. . Since the client is behind CGN, it’s not possible (without some difficulty involving total control of both sides attempting such a connection) for the client to be reachable from outside. Probably no provision is done anywhere (by equipments doing NAT) to translate and handle an incoming connection for this FTP PORT command and it’s rejected by the server since it’s a non-routable address (but more directly because the FTP server will accept only the same address used in the command connection to avoid so-called FXP transfers, and your address is not the one the FTP server sees).

• the FTP server you connect to can’t use passive mode
• your ISP can’t let you use active mode

There’s no solution without investing in something else:

if you have leverage to the right persons to have the FTP server accept passive mode, try it.

Get an ISP not giving you Carrier-Grade NAT addresses. Then any random home router (probably including the one provided by the ISP) will handle correctly the translation of the PORT command in active FTP.

This shouldn’t be a simple commercial VPN to anonymize clients using it. It should be a full VPN on which you have full control to allow incoming traffic and correct handling of the FTP protocol. It could be a limited one allowing to port-forward some ports, which then also requires configuration on the client side to match the same address and ports, or it could be for example a Linux VPS where you can load kernel modules like nf_conntrack_ftp / nf_nat_ftp and use iptables or nftables, to automatically translate the PORT command from your client (as long as there’s no encryption used in FTP).

• don’t use FTP for the resource you seek

Have it available on HTTP, HTTPS, SFTP (that’s along SSH, not related to FTP).

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Permission denied in FTP even though I’m the owner

Okay, so I’ve tried my best at finding the answer to this by searching and looking through possible duplicates, but I just can’t so forgive me if it’s out there somewhere anyways.

My issue is as follows. I’ve set the owner of /var/www to myuser:www-data and permissions of the folder and all (currently just the basic index.html) it’s content to 750 , and Apache seems to run it as supposed, but I can’t access it when I FTP into the server as the myuser user. I mean, I can access it, but as soon as I try to edit, delete or add something I just get 500 Permission denied , and if I try to edit the permissions I get 500 Unknown SITE command .

Help! What do I do wrong? The idea on setting the user and group, and then the permissions as above was from a good friend of mine who is sort of an expert, but I feel like I’m bothering him when I ask so many questions, so if you can help me some more, that would be great!

I’m trying to put a backup with 4 vhosts back into the www-folder, but what I put there shouldn’t be of any concern, right? That’s just the confing of the vhosting later that has got anything to do with that, right?

Thanks in advance!

I ran this: myuser@myserver:/$ groups myuser And got this: myuser : myuser adm cdrom sudo dip plugdev lpadmin sambashare Then I ran this: myuser@myserver:/$ groups www-data And got this: www-data : www-data

And then this: myuser@myserver:/var/www$ ls -l And got this: total 4 -rwxr-x— 1 tjita1 www-data 177 Jan 25 17:45 index.html

Regarding the ftpserver, I didn’t do anything in particular, I just installed vsftpd. Oh yeah, I also added a line in I think /etc/vsftpd.conf or something like that, that reads something like this: chmod_enable=YES .

Also, I can’t get those 4-space-indents to work, sorry about that..

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Error “530: permission denied” when user logs in to vsftpd server via ftp

The Problem

Vsftp server is newly installed and has been brought up but can’t be accessed by certain users giving the error shown below.

The Solution

The cause is that if the parameter userlist_enable in file /etc/vsftpd/vsftpd.conf is YES and the parameter userlist_deny default value is also YES, then the username in file /etc/vsftpd/user_list will get ‘530 Permission denied‘ error and does not even prompt for a password.

When parameter userlist_enable is enabled, vsftpd will load the usernames in file /etc/vsftpd/userlist_file. If a user tries to log in using a name in this file, they will be denied before they are asked for a password. This may be useful in preventing cleartext passwords being transmitted.

Parameter userlist_deny will be examined if userlist_enable is activated. If you set this setting to NO, then users will be allowed to login when they are listed in the file /etc/vsftpd/userlist_file.

So, we can resolve this issue by setting userlist_deny to NO when userlist_enable is activated. Then put the allowed usernames in file /etc/vsftpd/user_list and put the not allowed usernames in file /etc/vsftpd/ftpusers.

You can see the explanation from manual of vsftpd.conf.

You can also see these comments in file /etc/vsftpd/user_list .

Allowing a VSFTP Server local user to login

1. Edit /etc/vsftpd/vsftpd.conf and set userlist_enable to YES and userlist_deny to NO.

2. Modify /etc/vsftpd/user_list, put the user (user01) which is allowed to login in this file

3. Put all users not allowed to ftp in /etc/vsftpd/ftpusers.

4. Restart vsftpd service.

5. Try ftp again with user – user01.

6. Also try Login by disallowed userid, for example, root.

Источник

The error message is as follows:

(1): The system refuses the root user ftp by default.

(2): Check if the ftp service is enabled:

(3): Is the ftp service installed?

General situation above three steps can be resolved 530 Permission denied
This article refers to a large number of documents, if you find other problems, please leave a message

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