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Nov 18 11:25:22 server in.telnetd[1511]: connect from client.site.com Nov 18 12:16:30 server in.ftpd[1556]: connect from workstation.site.com
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These entries indicate that between 11:00 A.M. and 1:00 P.M. on November 18, clients connected using Telnet from client.site.com and workstation.site.com. In addition, there was an FTP connection from workstation.site.com. Although this section has examined wrappers only for in.ftpd and in.telnetd, wrappers can be compiled for most services launched from inetd, including finger, talk, tftp (trivial FTP), and rsh (remote shell).
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In this chapter, you have learned about the basic security services and paradigms that underlie Solaris and its ability to withstand many common attacks while still providing many networked services.
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ne of the aspects of Solaris that is most confusing for novice users is the Solaris file access permissions system. The basic approach to setting and interpreting relative file permissions is to use a set of symbolic codes to represent users and permission types. However, even advanced users may find it difficult to understand the octal permission codes that are used to set absolute permissions. When combined with a default permission mask set in the user s shell (the umask), octal permission codes are more powerful than symbolic permission codes. In this chapter, we examine how to set and manage basic access controls.
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The following key concepts are required knowledge for understanding access controls.
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The Solaris file system permits three basic kinds of file access the ability to read (r), to write (w), and to execute (x) a file or directory. These permissions can be granted exclusively or nonexclusively on individual files, or on a group of files specified by a wildcard (*). These permissions can be set by using the chmod command, in combination with the + operator. Permissions can be easily removed with the chmod command by using the operator. For example, to set read permissions (for the current user) on the file /usr/local/lib/ libproxy.a, you would use this command:
$ chmod +r /usr/local/lib/libproxy.a
or to set read permissions for all users on the file /usr/local/lib/libproxy.a, you would use this command:
$ chmod a+r /usr/local/lib/libproxy.a
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Part III:
Security
To remove read permissions on the file /usr/local/lib/libproxy.a for all users who are not members of the current user s default group, you would use this command:
$ chmod o-r /usr/local/lib/libproxy.a
This does not remove the group and user read permissions that were set previously. Similarly, you can set execute and write permissions. For example, to set execute permissions on the /usr/local/bin/gcc files, for each class of user (current user, group, and world), you would use the following commands:
$ chmod u+x /usr/local/bin/gcc $ chmod g+x /usr/local/bin/gcc $ chmod o+x /usr/local/bin/gcc
To explicitly remove write permissions on the /usr/local/bin/gcc files for each class of user (current user, group, and world), you would use these commands:
$ chmod u-w /usr/local/bin/gcc $ chmod g-w /usr/local/bin/gcc $ chmod o-w /usr/local/bin/gcc
It makes sense to combine these settings into a single command:
$ chmod oug-w /usr/local/bin/gcc
The rationale behind using read and write permissions should be clear: permitting read access on a file allows an identified user to access the text of a file by reading it byte by byte; write access permits the user to modify or delete any file on which the write permission is granted, regardless of who originally created the file. Thus, individual users can create files that are readable and writeable by any other user on the system. The permission to execute a file must be granted on scripts (such as shell scripts or Perl scripts) in order for them to be executed; compiled and linked applications must also have the execute bit set on a specific application. The executable permission must also be granted on the special files that represent directories on the file system, if the directory s contents are to be accessed by a specific class of user. The different options available for granting file access permissions can sometimes lead to interesting but confusing scenarios. For example, permissions can be set to allow a group to delete a file, but not to execute it. More usefully, a group might be given execute permission on an application, but be unable to write over it. In addition, setting file
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