apiVersion: cilium.io/v1alpha1
kind: TracingPolicyNamespaced
metadata:
  name: "file-monitoring-filtered"
spec:
  kprobes:
  - call: "security_file_permission"
    syscall: false
    return: true
    args:
    - index: 0
      type: "file" # (struct file *) used for getting the path
    - index: 1
      type: "int" # 0x04 is MAY_READ, 0x02 is MAY_WRITE
    returnArg:
      index: 0
      type: "int"
    selectors:
    - matchArgs:      
      - index: 0
        operator: "Prefix"
        values:
        - "/boot"           # Reads to sensitive directories
        - "/root/.ssh"      # Reads to sensitive files we want to know about
        - "/etc/shadow"
        - "/etc/profile"
        - "/etc/sudoers"
        - "/etc/pam.conf"   # Reads global shell configs bash/csh supported
        - "/etc/bashrc"
        - "/etc/csh.cshrc"
        - "/etc/csh.login"  # Add additional sensitive files here
      - index: 1
        operator: "Equal"
        values:
        - "4" # MAY_READ
      matchActions:
      - action: Sigkill
    - matchArgs:      
      - index: 0
        operator: "Postfix"
        values:
        - ".bashrc"         # Reads to shell config files bash, csh supported
        - ".bash_profile"   # add any other shell support here.
        - ".bash_login"
        - ".bash_logout"
        - ".cshrc"
        - ".cshdirs"
        - ".profile"        # Reads to common environments files
        - ".login"
        - ".logout"
        - ".history"        # Add additional sensitive files here
      - index: 1
        operator: "Equal"
        values:
        - "4" # MAY_READ
      matchActions:
      - action: Sigkill
    - matchArgs:      
      - index: 0
        operator: "Prefix"
        values:
        - "/etc"              # Writes to sensitive directories
        - "/boot"
        - "/lib"
        - "/lib64"
        - "/bin"
        - "/usr/lib"
        - "/usr/local/lib"
        - "/usr/local/sbin"
        - "/usr/local/bin"
        - "/usr/bin"
        - "/usr/sbin"
        - "/var/log"          # Writes to logs
        - "/dev/log"
        - "/root/.ssh"        # Writes to sensitive files add here.
      - index: 1
        operator: "Equal"
        values:
        - "2" # MAY_WRITE
      matchActions:
      - action: Sigkill
  - call: "security_mmap_file"
    syscall: false
    return: true
    args:
    - index: 0
      type: "file" # (struct file *) used for getting the path
    - index: 1
      type: "uint32" # the prot flags PROT_READ(0x01), PROT_WRITE(0x02), PROT_EXEC(0x04)
    - index: 2
      type: "uint32" # the mmap flags (i.e. MAP_SHARED, ...)
    returnArg:
      index: 0
      type: "int"
    selectors:
    - matchArgs:      
      - index: 0
        operator: "Prefix"
        values:
        - "/boot"           # Reads to sensitive directories
        - "/root/.ssh"      # Reads to sensitive files we want to know about
        - "/etc/shadow"
        - "/etc/sudoers"
        - "/etc/pam.conf"   # Reads global shell configs bash/csh supported
        - "/etc/profile"
        - "/etc/bashrc"
        - "/etc/csh.cshrc"
        - "/etc/csh.login"
        - ".bashrc"         # Reads to shell config files bash, csh supported
        - ".bash_profile"   # add any other shell support here.
        - ".bash_login"
        - ".bash_logout"
        - ".cshrc"
        - ".cshdirs"
        - ".profile"        # Reads to common environments files
        - ".login"
        - ".logout"
        - ".history"        # Add additional sensitive mmap files here
      - index: 1
        operator: "Equal"
        values:
        - "1" # MAY_READ
      - index: 2
        operator: "Mask"
        values:
        - "1" # MAP_SHARED
      matchActions:
      - action: Sigkill
    - matchArgs:
      - index: 0
        operator: "Prefix"
        values:
        - "/etc"              # Writes to sensitive directories
        - "/boot"
        - "/lib"
        - "/lib64"
        - "/bin"
        - "/usr/lib"
        - "/usr/local/lib"
        - "/usr/local/sbin"
        - "/usr/local/bin"
        - "/usr/bin"
        - "/usr/sbin"
        - "/var/log"          # Writes to logs
        - "/dev/log"
        - "/root/.ssh"        # Writes to sensitive files add here.
      - index: 1
        operator: "Mask"
        values:
        - "2" # PROT_WRITE
      - index: 2
        operator: "Mask"
        values:
        - "1" # MAP_SHARED
      matchActions:
      - action: Sigkill
  - call: "security_path_truncate"
    syscall: false
    return: true
    args:
    - index: 0
      type: "path" # (struct path *) used for getting the path
    returnArg:
      index: 0
      type: "int"
    selectors:
    - matchArgs:
      - index: 0
        operator: "Prefix"
        values:
        - "/etc"              # Truncate to sensitive directories
        - "/boot"
        - "/lib"
        - "/lib64"
        - "/usr/lib"
        - "/usr/local/lib"
        - "/usr/local/sbin"
        - "/usr/local/bin"
        - "/usr/bin"
        - "/usr/sbin"
        - "/var/log"          # Truncate to logs
        - "/dev/log"
        - "/root/.ssh"        # Truncate to sensitive files add here.
      matchActions:
      - action: Sigkill