File permissions and access control in Cybersecurity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to represent the read permission in Unix file permissions.

Cybersecurity

read_permission = '[1]'

Drag options to blanks, or click blank then click option'

Ar

Bw

Cx

Dd

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing write permission 'w' with read permission.

Using 'x' which stands for execute permission.

The letter r stands for read permission in Unix file systems, allowing a user to view the contents of a file.

2fill in blank

medium

Complete the code to check if a user has execute permission on a file.

Cybersecurity

if permissions & [1]:
    print("User can execute the file")

Drag options to blanks, or click blank then click option'

A0o400

B0o100

C0o200

D0o1000

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong octal value for execute permission.

Confusing execute permission with directory bit 0o1000.

The execute permission for the user (owner) is represented by the octal value 0o100. Using bitwise AND checks if this permission is set.

3fill in blank

hard

Fix the error in the code to correctly set write permission for the group.

Cybersecurity

new_permissions = current_permissions | [1]

Drag options to blanks, or click blank then click option'

A0o2000

B0o200

C0o002

D0o020

Attempts:

3 left

💡 Hint

Common Mistakes

Using owner write permission 0o200 instead of group write.

Using directory sticky bit 0o2000 by mistake.

The group write permission is represented by 0o020. Using bitwise OR adds this permission without affecting others.

4fill in blank

hard

Fill both blanks to create a dictionary mapping users to their access level, filtering only those with read permission.

Cybersecurity

access_levels = {user: level for user, level in user_permissions.items() if level & [1] == [2]

Drag options to blanks, or click blank then click option'

A0o400

B0o200

C0o100

D0o000

Attempts:

3 left

💡 Hint

Common Mistakes

Using write or execute bits instead of read.

Comparing to zero which would select users without read permission.

This code filters users who have the read permission bit set (0o400). The condition checks if the read bit is exactly present.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps filenames to their permissions, including only files with execute permission set.

Cybersecurity

exec_files = {filename: perms for filename, perms in files.items() if perms & [1] == [2] and perms & [3] != 0}

Drag options to blanks, or click blank then click option'

A0o100

C0o001

D0o400

Attempts:

3 left

💡 Hint

Common Mistakes

Using read or write bits instead of execute bits.

Mixing up user and others permission bits.

The code filters files that have the user execute bit (0o100) exactly set and also have the others execute bit (0o001) set. This ensures files are executable by user and others.