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After properly invoking chroot(), a process cannot access any files outside the specified directory tree Such an environment is called a chroot jail and is commonly used to prevent the possibility that a process could be subverted and used to access protected files For instance, many FTP servers run in chroot jails to prevent an attacker who discovers a new vulnerability in the server from being able to download other files on the system On FreeBSD systems, consider using the Jail utility, which implements even stronger protections than the chroot jail [Sarmiento, 2001] Improper use of chroot() can allow attackers to escape from the chroot jail Unfortunately, there are at least four easy ways to make a mess with chroot() Example 123 shows all of them The code is responsible for reading a filename from the network, opening the corresponding file on the local machine, and sending the contents over the network (It could be used to implement the FTP GET command) To limit the damage a bug could cause, the code attempts to create a chroot jail before handling any requests This attempt to create a chroot jail has four problems: Calling chroot() does not affect any file descriptors that are currently open, so open file handles can point to files outside the chroot jail To be safe, close every open file handle before calling chroot() The chroot() function call does not change the process s current working directory, so relative paths such as /////etc/passwd can still refer to filesystem resources outside the chroot jail after chroot() has been called Always follow a call to chroot() with the call chdir("/") Verify that any error handling code between the chroot() call and the chdir() call does not open any files and does not return control to any part of the program other than shutdown routines The chroot() and chdir() commands should be as close together as possible to limit exposure to this vulnerability It is also possible to create a proper chroot jail by calling chdir() first, but we prefer to see chroot() come first The call to chdir() can then take a constant argument ("/"), which is both easier to get right and easier to verify during a code review A call to chroot() can fail Check the return value from chroot() to make sure the call succeeded To call chroot(), the program must be running with root privileges As soon as the privileged operation has completed, the program should drop root privileges and return to the privileges of the invoking user The code in Example 123 continues to run as root Oops.

This method modi es the translational components of this transform to the values of the argument The other values of this transform are not modi ed

chroot("/var/ftproot"); if (fgets(filename, sizeof(filename), network) != NULL) { if (filename[strlen(filename) - 1] == '\n') { filename[strlen(filename) - 1] = '\0'; } localfile = fopen(filename, "r"); while ((len = fread(buf, 1, sizeof(buf), localfile)) != EOF) { (void)fwrite(buf, 1, len, network); } }

public final void set(Quat4f q1) public final void set(Quat4d q1)

public final void set(Quat4d q1, Vector3d t1, double s) public final void set(Quat4f q1, Vector3d t1, double s) public final void set(Quat4f q1, Vector3f t1, float s)

The code in Example 124 demonstrates the correct construction of a chroot jail It fixes all the problems listed

These methods set the value of this matrix from the rotation expressed by the quaternion q1, the translation t1, and the scale s

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In applications with multiple windows, each window title should be unique This section helps you create unique window titles for:

Example 124 Code from the simple FTP server in Example 123 rewritten to create a chroot jail correctly

public final void set(Vector3d trans) public final void set(Vector3f trans)

These methods set the translational value of this matrix to the speci ed vector parameter values and set the other components of the matrix as if this transform were an identity matrix

// close all open file descriptors for (int i = 0; i < sysconf(_SC_OPEN_MAX); i++) { if (close(i) != 0) { exit(-1); } } // call chroot, check for errors, // then immediately call chdir if ((chroot("/var/ftproot") != 0) || (chdir("/") != 0)) { exit(-1); } // drop privileges if (drop_priv_temp(getuid()) != 0) { exit(-1); } if (fgets(filename, sizeof(filename), network) != NULL) { if (filename[strlen(filename) - 1] == '\n') { filename[strlen(filename) - 1] = '\0'; } localfile = fopen(filename, "r"); while ((len = fread(buf, 1, sizeof(buf), localfile)) != EOF) { (void)fwrite(buf, 1, len, network) ; } }

NODE COMPONENT OBJECTS public final void set(Vector3d v1, double scale) public final void set(Vector3f v1, float scale)

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