Skip to content

Server_Daemon.md

Latest commit

 

History

History
127 lines (78 loc) · 5.22 KB

Server_Daemon.md

File metadata and controls

127 lines (78 loc) · 5.22 KB
graph LR
    Server_Daemon_hpnsshd_["Server Daemon (hpnsshd)"]
    SSH_Core_Protocol_Engine["SSH Core Protocol Engine"]
    Authentication_Manager["Authentication Manager"]
    Configuration_Parser["Configuration Parser"]
    SFTP_Subsystem["SFTP Subsystem"]
    Platform_Abstraction_Layer_PAL_["Platform Abstraction Layer (PAL)"]
    User_Sessions["User Sessions"]
    Command_Execution["Command Execution"]
    External_SSH_Clients["External SSH Clients"]
    External_SSH_Clients -- "connects to" --> Server_Daemon_hpnsshd_
    Server_Daemon_hpnsshd_ -- "delegates protocol handling to" --> SSH_Core_Protocol_Engine
    Server_Daemon_hpnsshd_ -- "requests authentication from" --> Authentication_Manager
    Server_Daemon_hpnsshd_ -- "uses configuration from" --> Configuration_Parser
    Server_Daemon_hpnsshd_ -- "manages" --> User_Sessions
    Server_Daemon_hpnsshd_ -- "orchestrates" --> Command_Execution
    Server_Daemon_hpnsshd_ -- "manages operations of" --> SFTP_Subsystem
    Server_Daemon_hpnsshd_ -- "leverages" --> Platform_Abstraction_Layer_PAL_
    SSH_Core_Protocol_Engine -- "provides secure communication to" --> Server_Daemon_hpnsshd_
    Authentication_Manager -- "returns status to" --> Server_Daemon_hpnsshd_
    Authentication_Manager -- "interacts with" --> Platform_Abstraction_Layer_PAL_
    Configuration_Parser -- "provides data to" --> Server_Daemon_hpnsshd_
    Configuration_Parser -- "influences" --> Authentication_Manager
    Configuration_Parser -- "influences" --> SFTP_Subsystem
    SFTP_Subsystem -- "leverages" --> Platform_Abstraction_Layer_PAL_
    User_Sessions -- "facilitates" --> Command_Execution
    Command_Execution -- "leverages" --> Platform_Abstraction_Layer_PAL_
    click SSH_Core_Protocol_Engine href "https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/hpn-ssh/SSH_Core_Protocol_Engine.md" "Details"
Loading

CodeBoardingDemoContact

Details

One paragraph explaining the functionality which is represented by this graph. What the main flow is and what is its purpose.

Server Daemon (hpnsshd)

The primary server-side entry point. It initializes the SSH server, listens for incoming client connections, orchestrates secure session establishment, and manages the overall lifecycle of client interactions. It delegates core protocol handling, authentication, and specific service provision.

Related Classes/Methods:

  • sshd.c (1:1)

SSH Core Protocol Engine [Expand]

Handles low-level SSH protocol operations, including key exchange, encryption, decryption, packet processing, and channel management. It provides the fundamental secure communication primitives for the Server Daemon.

Related Classes/Methods:

  • kex.c (1:1)
  • cipher.c (1:1)
  • channel.c (1:1)

Authentication Manager

Manages the client authentication processes, verifying client credentials against various configured methods (e.g., password, public key, PAM, FIDO2). It determines if a client is authorized to establish a session.

Related Classes/Methods:

  • auth.c (1:1)
  • auth-options.c (1:1)
  • auth-pam.c (1:1)

Configuration Parser

Parses and applies server-specific configurations from sshd_config and other related files. It provides runtime parameters for the Server Daemon and other components, influencing behavior like port listening, authentication methods, and security settings.

Related Classes/Methods:

  • readconf.c (1:1)
  • sshd_config.c (1:1)

SFTP Subsystem

Provides secure file transfer services over the SSH protocol. It handles SFTP-specific commands, manages file system operations, and ensures data integrity and security during transfers.

Related Classes/Methods:

  • sftp-server.c (1:1)

Platform Abstraction Layer (PAL)

Provides a well-defined interface to abstract OS-specific functionalities. This includes system calls for process management, file system access, network I/O, privilege separation, sandboxing, and integration with system services like PAM.

Related Classes/Methods:

  • platform.c (1:1)
  • compat.c (1:1)
  • sandbox.c (1:1)

User Sessions

Manages the state and lifecycle of individual client sessions after successful authentication. This includes tracking session parameters, managing pseudo-terminals (PTYs), and handling session termination.

Related Classes/Methods:

  • session.c (1:1)
  • session_pty.c (1:1)

Command Execution

Responsible for executing commands or shell sessions requested by authenticated clients. It handles process creation, I/O redirection, and ensures proper privilege separation and sandboxing for executed commands.

Related Classes/Methods:

  • exec.c (1:1)
  • child.c (1:1)

External SSH Clients

Represents external SSH clients connecting to the server daemon.

Related Classes/Methods: None

FAQ