Soft link Hard link selinux my blog

Link
Soft Links: Pointing files, if the file source is deleted by soft links cannot enter the hard link opposite
The establishment of a soft link ln-s file name. link
The Ln-s file name of the hard link is established.

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SELinux

1 Basic SELINUX Security Concepts

SELINUX (Security-enhanced Linux) is the amount of security that can protect your system
External mechanisms
In a way, it can be seen as a permission system that is parallel to the standard
Ec In normal mode, the process runs as a user, and the files on the system
and other resources are set, which controls which users have which files
Another difference in Access SELINUX is that to access files,
You must have a regular visit
Permissions and SELINUX access rights. Therefore, even with Superuser status
Root run process, based on process and SELinux security of files or resources
The sexual context may deny access to a file or resource limit) label

2SELINUX mode "Kernel firewall"

1 Enforcing mandatory mode "SELinux must be enforced even if it conflicts with records"
2 Permissive licensing Mode
3 Disabled off

Getenforce "See SELinux status"
Setenforce 0|1 "0 means permissive 1 means enforcing"

When the client accesses the host because SELinux is turned on, it is not possible to obtain the desired file by the following methods

1 Put the file under/var/www/html and also modify the label "http"

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2 Put the file in the/var/ftp/file to modify its label "LFTP"

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3 Changing the security context can allow anonymous users to write

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Soft link Hard link selinux my blog