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use std::ffi::CString;
use std::marker;
use std::slice;
use std::str;
use std::sync::Arc;
use util::Binding;
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<SessionInner>,
}
/// An iterator over the identities found in an SSH agent.
pub struct Identities<'agent> {
prev: *mut raw::libssh2_agent_publickey,
agent: &'agent Agent,
}
/// A public key which is extracted from an SSH agent.
pub struct PublicKey<'agent> {
raw: *mut raw::libssh2_agent_publickey,
_marker: marker::PhantomData<&'agent [u8]>,
}
impl Agent {
pub(crate) fn from_raw_opt(
raw: *mut raw::LIBSSH2_AGENT,
sess: &Arc<SessionInner>,
) -> Result<Self, Error> {
if raw.is_null() {
Err(Error::last_error_raw(sess.raw).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> {
unsafe { self.sess.rc(raw::libssh2_agent_connect(self.raw)) }
}
/// Close a connection to an ssh-agent.
pub fn disconnect(&mut self) -> Result<(), Error> {
unsafe { self.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> {
unsafe { self.sess.rc(raw::libssh2_agent_list_identities(self.raw)) }
}
/// Get an iterator over the identities of this agent.
pub fn identities(&self) -> Identities {
Identities {
prev: 0 as *mut _,
agent: self,
}
}
/// 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)?;
unsafe {
self.sess.rc(raw::libssh2_agent_userauth(
self.raw,
username.as_ptr(),
identity.raw,
))
}
}
}
impl Drop for Agent {
fn drop(&mut self) {
unsafe { raw::libssh2_agent_free(self.raw) }
}
}
impl<'agent> Iterator for Identities<'agent> {
type Item = Result<PublicKey<'agent>, Error>;
fn next(&mut self) -> Option<Result<PublicKey<'agent>, Error>> {
unsafe {
let mut next = 0 as *mut _;
match raw::libssh2_agent_get_identity(self.agent.raw, &mut next, self.prev) {
0 => {
self.prev = next;
Some(Ok(Binding::from_raw(next)))
}
1 => None,
rc => Some(Err(self.agent.sess.rc(rc).err().unwrap())),
}
}
}
}
impl<'agent> PublicKey<'agent> {
/// Return the data of this public key.
pub fn blob(&self) -> &[u8] {
unsafe { slice::from_raw_parts_mut((*self.raw).blob, (*self.raw).blob_len as usize) }
}
/// Returns the comment in a printable format
pub fn comment(&self) -> &str {
unsafe { str::from_utf8(::opt_bytes(self, (*self.raw).comment).unwrap()).unwrap() }
}
}
impl<'agent> Binding for PublicKey<'agent> {
type Raw = *mut raw::libssh2_agent_publickey;
unsafe fn from_raw(raw: *mut raw::libssh2_agent_publickey) -> PublicKey<'agent> {
PublicKey {
raw: raw,
_marker: marker::PhantomData,
}
}
fn raw(&self) -> *mut raw::libssh2_agent_publickey {
self.raw
}
}
|
