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use parking_lot::{Mutex, MutexGuard};
use std::ffi::{CStr, CString};
use std::slice;
use std::str;
use std::sync::Arc;
use {raw, Error, SessionInner};
/// A structure representing a connection to an SSH agent.
///
/// Agents can be used to authenticate a session.
pub struct Agent {
raw: *mut raw::LIBSSH2_AGENT,
sess: Arc<Mutex<SessionInner>>,
}
// Agent is both Send and Sync; the compiler can't see it because it
// is pessimistic about the raw pointer. We use Arc/Mutex to guard accessing
// the raw pointer so we are safe for both.
unsafe impl Send for Agent {}
unsafe impl Sync for Agent {}
/// A public key which is extracted from an SSH agent.
#[derive(Debug, PartialEq, Eq)]
pub struct PublicKey {
blob: Vec<u8>,
comment: String,
}
impl Agent {
pub(crate) fn from_raw_opt(
raw: *mut raw::LIBSSH2_AGENT,
err: Option<Error>,
sess: &Arc<Mutex<SessionInner>>,
) -> Result<Self, Error> {
if raw.is_null() {
Err(err.unwrap_or_else(Error::unknown))
} else {
Ok(Self {
raw,
sess: Arc::clone(sess),
})
}
}
/// Connect to an ssh-agent running on the system.
pub fn connect(&mut self) -> Result<(), Error> {
let sess = self.sess.lock();
unsafe { sess.rc(raw::libssh2_agent_connect(self.raw)) }
}
/// Close a connection to an ssh-agent.
pub fn disconnect(&mut self) -> Result<(), Error> {
let sess = self.sess.lock();
unsafe { sess.rc(raw::libssh2_agent_disconnect(self.raw)) }
}
/// Request an ssh-agent to list of public keys, and stores them in the
/// internal collection of the handle.
///
/// Call `identities` to get the public keys.
pub fn list_identities(&mut self) -> Result<(), Error> {
let sess = self.sess.lock();
unsafe { sess.rc(raw::libssh2_agent_list_identities(self.raw)) }
}
/// Get list of the identities of this agent.
pub fn identities(&self) -> Result<Vec<PublicKey>, Error> {
let sess = self.sess.lock();
let mut res = vec![];
let mut prev = 0 as *mut _;
let mut next = 0 as *mut _;
loop {
match unsafe { raw::libssh2_agent_get_identity(self.raw, &mut next, prev) } {
0 => {
prev = next;
res.push(unsafe { PublicKey::from_raw(next) });
}
1 => break,
rc => return Err(Error::from_session_error_raw(sess.raw, rc)),
}
}
Ok(res)
}
fn resolve_raw_identity(
&self,
sess: &MutexGuard<SessionInner>,
identity: &PublicKey,
) -> Result<Option<*mut raw::libssh2_agent_publickey>, Error> {
let mut prev = 0 as *mut _;
let mut next = 0 as *mut _;
loop {
match unsafe { raw::libssh2_agent_get_identity(self.raw, &mut next, prev) } {
0 => {
prev = next;
let this_ident = unsafe { PublicKey::from_raw(next) };
if this_ident == *identity {
return Ok(Some(next));
}
}
1 => break,
rc => return Err(Error::from_session_error_raw(sess.raw, rc)),
}
}
Ok(None)
}
/// Attempt public key authentication with the help of ssh-agent.
pub fn userauth(&self, username: &str, identity: &PublicKey) -> Result<(), Error> {
let username = CString::new(username)?;
let sess = self.sess.lock();
let raw_ident = self
.resolve_raw_identity(&sess, identity)?
.ok_or_else(|| Error::new(raw::LIBSSH2_ERROR_BAD_USE, "Identity not found in agent"))?;
unsafe {
sess.rc(raw::libssh2_agent_userauth(
self.raw,
username.as_ptr(),
raw_ident,
))
}
}
}
impl Drop for Agent {
fn drop(&mut self) {
unsafe { raw::libssh2_agent_free(self.raw) }
}
}
impl PublicKey {
unsafe fn from_raw(raw: *mut raw::libssh2_agent_publickey) -> Self {
let blob = slice::from_raw_parts_mut((*raw).blob, (*raw).blob_len as usize);
let comment = (*raw).comment;
let comment = if comment.is_null() {
String::new()
} else {
CStr::from_ptr(comment).to_string_lossy().into_owned()
};
Self {
blob: blob.to_vec(),
comment,
}
}
/// Return the data of this public key.
pub fn blob(&self) -> &[u8] {
&self.blob
}
/// Returns the comment in a printable format
pub fn comment(&self) -> &str {
&self.comment
}
}
|
