24th Day Vsftp, Samba basic application

1. FTP protocol and VSFTP Basic application

2. Advanced application of VSFTP

3. RPC concept and basic application of NFS

4. Samba and its basic applications

One, file sharing services:

Application Layer: FTP

Kernel: NFS (Sun)

Cross-platform: Samba implements the CIFS (SMB) protocol on Linux

Ftp:file Transfer Protocol Application layer protocol: TCP, 21/TCP

C:

Client: Program

Server: Programs

Data:

Command connection: File Management class command, always on-line connection

Data connection: Transfer, create and close connections on demand

Data transfer format: text transfer, binary transfer

Active: The connection is created by the server

Command:

client:50000-server:21

Data:

SERVER:20/TCP-Client:50000+1

Passive: The connection is created by the client

Command:

client:50000-server:21

Data:

Client:50000+1-Server: Random port

SERVER:WU-FTPD, PROFTPD, Pureftp, vsftpd (Very Secure ftp), SERVU

Client:ftp\ (Lftp, Lftpget), wget, Curl, FileZilla, gftp (Linux GUI) \flashfxp\cuteftp

Response code:

1XX: Information

2XX: Status code for Success class

3xx: Prompt for further status codes for supplemental information

4XX: Client Error

5XX: Service-side error

User authentication:

Virtual User: Used only to access resources in a particular service

Nsswitch:network Server switch, name resolution framework

Configuration file:/etc/nsswitch.conf

Module:/lib64/libnss*,/usr/lib64/libnss*

Pam:pluggable authentication module, user authentication Framework

Module:/lib64/security/

Configuration files:/etc/pam.conf,/etc/pam.d/*

System users:

Anonymous users:

CentOS 6.5:vsftpd

User Authentication profile:/etc/pam.d/vsftpd

Service script:/ETC/RC.D/INIT.D/VSFTPD

Configuration file directory:/ETC/VSFTPD

Master configuration file: vsftpd.conf

Anonymous user (mapped to FTP user) shared resource location:/var/ftp

Location of resources accessed by the system user via ftp: User's own home directory

Location of resources accessed by the virtual user via ftp: The home directory of the system user to which the virtual user specified the mapping becomes

Configuration of anonymous users:

Anonymous_enable=yes Virtual User enablement

Anon_upload_enable=yes Virtual User upload permissions

Anon_mkdir_write_enable=yes Create directory permissions for virtual users

Anon_ohter_write_enable=yes Delete directory and file permissions for virtual users

Configuration of the system User:

Local_enable=yes Local System User enabled

Write_enable=yes Local System User Write permissions (create and delete files, directories)

local_umask=022 file permissions for system users after uploading files 644

Imprison all FTP Local users in their home directory:

Chroot_local_user=yes

The FTP local users specified in the imprison file are in their home directory:

Chroot_list_enable=yes

Chroot_list_file=/etc/vsftpd/chroot_list

24th Day Vsftp, Samba basic application