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where somedir is the directory that requires the sticky bit to be set.
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The following example demonstrates how to use the shell.
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One problem with assigning file access permissions is that users other than one s self fall into two categories: group members or nongroup members. Thus, if you want to make some files available to one group of users but not to another group of users, you need to ask the system administrator to create a group for you. Of course, the main problem with the random group-creation approach is group sprawl administrators are generally unwilling to create groups at the request of users because of the overhead in administering potentially hundreds of different groups on each system, and since the number of groups that one user can be in is limited. The best solution to the problem is to structure group membership to reflect organizational divisions and to use access control lists (ACLs) to manage file access. While it may seem like creating more work to have two sets of file access permissions operating, in reality it s the simplest solution for users who don t require superuser permissions. To grant the user charles read-only access to the file secret.doc, which is owned by the user ainsley and has read-write permissions only for ainsley, the following command would be executed by ainsley:
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$ setfacl -m user:charles:r-- secret.doc
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Alternatively, to allow charles to have read-write access to the file, the following command can be used:
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$ setfacl -m user:charles:rw- secret.doc
When an ACL has been set, the file listing shows a + symbol at the end of the permissions string:
# ls -l /home/charles/secret.doc -rw-------+ 1 charles admin /home/charles/secret.doc
Jan 24 12:07
The output of getfacl for a file (/etc/passwd in this example) looks like this:
$ getfacl /etc/passwd # file: /etc/passwd # owner: root # group: sys user::rw-
Part III:
Security
group::r-mask:r-other:r--
#effective:r--
Command Reference
The following command is commonly used to work with access controls.
The ls command is the main directory and file permission listing program used in Solaris. When displaying a long listing, it prints file access permissions, user and group ownerships, file size and creation date, and the filename. For example, for the password file /etc/passwd, the output from ls would look like this:
$ ls l /etc/passwd -r--r--r-1 root
other
256 Sep
18 00:40 passwd
This directory entry can be read from left to right in the following way: The password file is not a directory, indicated by the first -. This could also indicate a character or block special device. The password file has read-only permissions for the owner r-- (but not execute or write permissions). The password file has read-only permissions for group members r--. The password file has read-only permissions for other staff r--. The password file is owned by the root user. The password file has other group permissions. The password file size is 256 kilobytes. The password file was created on September 18, at 00:40 A.M. The name of the password file is passwd. The permissions string shown changes depending on the permissions that have been set by the owner. For example, if the password file had execute and write permissions for the root user, then the permissions string would read rwxr--r--, rather than just r--r--r--. Each of the permissions can be set using symbolic or octal permission codes, by using the chmod command. You ve seen how a normal file looks under ls, but let s compare this with a directory entry, which is a special kind of file that is usually created by the mkdir command:
# mkdir samples
10:
File System Access Control
You can check the permissions of the directory entry by using the ls command:
# ls -l total 8 drwxrwxr-x
2 root
other
512 Sep
5 13:41 samples
The directory entry for the directory samples can be read from left to right in the following way: The directory entry is a special file denoted by a leading d. The directory entry has read, write, and execute permissions for the owner rwx. The directory entry has read, write, and execute permissions for group members rwx. The directory entry has read and execute permissions for other staff r-x. The directory entry is owned by the root user. The directory entry has other group permissions. The directory entry size is 512 kilobytes. The directory entry was created on September 5, at 1:41 P.M. The name of the directory is samples. For a directory to be accessible to a particular class of user, the executable bit must be set using the chmod command.
Summary
In this chapter, we have examined the basic facilities for user-based access controls provided in Solaris. While these controls are important, they have been enhanced with the inclusion of Role-Based Access Control (RBAC), which is covered in 11.
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