diff options
Diffstat (limited to 'libangelshark/src/acm.rs')
| -rw-r--r-- | libangelshark/src/acm.rs | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/libangelshark/src/acm.rs b/libangelshark/src/acm.rs new file mode 100644 index 0000000..a9ffae1 --- /dev/null +++ b/libangelshark/src/acm.rs @@ -0,0 +1,230 @@ +use crate::Message; +use anyhow::{anyhow, Context, Result}; +use cached::{proc_macro::cached, Return, TimedCache}; +use ssh2::{KeyboardInteractivePrompt, Prompt, Session, Stream}; +use std::{ + fmt::Debug, + io::{BufRead, BufReader, Read, Write}, + net::{Ipv4Addr, TcpStream}, +}; + +const DEFAULT_PORT: u16 = 5022; +const OSSI_LOGOFF: &[u8] = b"clogoff\nt\ny\n"; +const OSSI_MAN_TERM: &[u8] = b"ossiem\n"; +const OSSI_TERM: &[u8] = b"ossie\n"; +const TERM: &str = "vt100"; +const TERM_DIMS: (u32, u32, u32, u32) = (81, 25, 0, 0); +const TIMEOUT_MS: u32 = 30000; // Thirty second read/write timeout. + +/// Represents a Communication Manager and its login information. Executes +/// collections of [Message]s on an ACM over SSH. +#[derive(Clone)] +pub struct Acm { + addr: Ipv4Addr, + port: Option<u16>, + user: String, + pass: String, +} + +impl Debug for Acm { + /// Formats an ACM's configuration information for debugging. Masks passwords. + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + f.debug_struct("Acm") + .field("addr", &self.addr) + .field("port", &self.port.unwrap_or(DEFAULT_PORT)) + .field("user", &self.user) + .field("pass", &"********") + .finish() + } +} + +impl Default for Acm { + fn default() -> Self { + Self { + addr: Ipv4Addr::new(127, 0, 0, 1), + port: Default::default(), + user: Default::default(), + pass: Default::default(), + } + } +} + +impl Acm { + /// Adds an IPv4 address to ACM config. + pub fn with_addr(&mut self, addr: Ipv4Addr) -> &mut Self { + self.addr = addr; + self + } + + /// Adds a port to ACM config. + pub fn with_port(&mut self, port: u16) -> &mut Self { + self.port = Some(port); + self + } + + /// Adds a login usermame to ACM config. + pub fn with_user(&mut self, user: &str) -> &mut Self { + self.user = user.into(); + self + } + + /// Adds a login password to ACM config. + pub fn with_pass(&mut self, pass: &str) -> &mut Self { + self.pass = pass.into(); + self + } + + /// Opens a readable and writable SSH stream into an ACM's Site Administration Terminal. + fn open_stream(&self, term: &[u8]) -> Result<Stream> { + // Initialize SSH session. + let stream = TcpStream::connect((self.addr, self.port.unwrap_or(DEFAULT_PORT))) + .with_context(|| "Failed to open TCP stream to host. Make sure the config is correct and the host is otherwise reachable.")?; + let mut session = Session::new().with_context(|| "Failed to start SSH session.")?; + session.set_tcp_stream(stream); + session.set_timeout(TIMEOUT_MS); + session + .handshake() + .with_context(|| "SSH handshake failed.")?; + session + .userauth_keyboard_interactive(&self.user, &mut SshPrompter::new(&self.pass)) + .with_context(|| "Interactive SSH keyboard authentication failed.")?; + + // Open shell on SSH channel. + let mut channel = session + .channel_session() + .with_context(|| "Failed to open SSH channel on SSH session.")?; + channel + .request_pty(TERM, None, Some(TERM_DIMS)) + .with_context(|| "Failed to open PTY on SSH channel.")?; + channel + .shell() + .with_context(|| "Failed to open shell on SSH channel.")?; + channel + .write_all(term) + .with_context(|| "Failed to send OSSI term.")?; + + // Waits until OSSI terminator is read to return channel. If this times + // out, something went wrong with login or ACM is unreachable. + let mut lines = BufReader::new(channel.stream(0)).lines(); + while let Some(Ok(line)) = lines.next() { + if line == "t" { + return Ok(channel.stream(0)); + } + } + + Err(anyhow!("Never reached OSSI term prompt.")) + } + + /// Runs a given collection of [Message]s (OSSI commands) on the ACM and returns their resulting output. + pub fn run(&self, inputs: &[Message]) -> Result<Vec<Message>> { + let inputs: String = inputs.iter().map(Message::to_string).collect(); + let mut stream = self.open_stream(OSSI_TERM)?; + write!(stream, "{}", inputs).with_context(|| "Failed to write inputs to OSSI stream.")?; + stream + .write_all(OSSI_LOGOFF) + .with_context(|| "Failed to write LOGOFF to OSSI stream.")?; + Message::from_output(stream) + } + + /// Like [Self::run], but caches results with a timed cache of thirty minutes. + pub fn run_cached(&self, inputs: &[Message]) -> Result<Vec<Message>> { + Ok(run_cached(self, inputs)?.value) + } + + /// Like [Self::run], but instead of running [Message]s, it returns the manual pages for the provided OSSI commands. + pub fn manual(&self, inputs: &[Message]) -> Result<String> { + let inputs: String = inputs.iter().map(Message::to_string).collect(); + let mut stream = self.open_stream(OSSI_MAN_TERM)?; + write!(stream, "{}", inputs).with_context(|| "Failed to write inputs to OSSI stream.")?; + stream + .write_all(OSSI_LOGOFF) + .with_context(|| "Failed to write LOGOFF to OSSI stream.")?; + let mut output = String::new(); + stream + .read_to_string(&mut output) + .with_context(|| "Failed to read manual pages to string.")?; + Ok(output) + } + + /// Reads from `readable`, parsing lines as `asa.cfg`-formatted ACM logins. + /// Returns a collection of the parsed logins and their associated + /// names/labels. The spec looks like this: + /// + /// ```text + /// (name user:pass@addr:optional_port) + /// ACM01 admin:secret@192.168.1.1:5022 + /// ACM02 acdmin:secret@192.168.1.2 + /// ACM03 acdmin:secret@192.168.1.3:5023 + /// ``` + /// + /// The port is optional. If it is not provided, the default SAT port of + /// 5022 will be used. + pub fn from_logins(readable: impl Read) -> Result<Vec<(String, Self)>> { + let mut acms = Vec::new(); + + for line in BufReader::new(readable).lines() { + let line = line.with_context(|| "Failed to read line of config.")?; + let mut acm = Self::default(); + + if let Some((name, config)) = line.split_once(' ') { + if let Some((creds, dest)) = config.split_once('@') { + if let Some((user, pass)) = creds.split_once(':') { + if let Some((addr, port)) = dest.split_once(':') { + acm.with_port( + port.parse() + .with_context(|| "Failed to parse ACM socket port.")?, + ) + .with_addr( + addr.parse() + .with_context(|| "Failed to parse ACM IP address.")?, + ); + } else { + acm.with_addr( + dest.parse() + .with_context(|| "Failed to parse ACM IP address.")?, + ); + } + + acm.with_user(user).with_pass(pass); + acms.push((name.into(), acm)); + } + } + } + } + Ok(acms) + } +} + +/// This memoized function is a timed cache where entries are evicted after +/// thirty minutes. Errors are not cached, only successes. +#[cached( + result = true, + type = "TimedCache<String, Return<Vec<Message>>>", + create = "{ TimedCache::with_lifespan(1800) }", + convert = r#"{ format!("{}{:?}{:?}", acm.addr, acm.port, inputs) }"# +)] +fn run_cached(acm: &Acm, inputs: &[Message]) -> Result<Return<Vec<Message>>> { + Ok(Return::new(acm.run(inputs)?)) +} + +/// Used internally for password-based SSH authentication. +struct SshPrompter<'a> { + pass: &'a str, +} + +impl<'a> SshPrompter<'a> { + fn new(pass: &'a str) -> Self { + Self { pass } + } +} + +impl<'a> KeyboardInteractivePrompt for SshPrompter<'a> { + fn prompt<'b>( + &mut self, + _username: &str, + _instructions: &str, + _prompts: &[Prompt<'b>], + ) -> Vec<String> { + vec![self.pass.to_owned()] + } +} |