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feat: Initial implementation (bind/search/whoami)

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[package]
name = "multildap"
version = "0.1.0"
edition = "2024"
[dependencies]
anyhow = "1.0.104"
clap = { version = "4.6.6", features = ["derive"] }
futures-util = { version = "^0.3.32", features = [ "sink" ] }
indexmap = "2.14.0"
ldap3 = { version = "0.12.1", default-features = false }
ldap3_proto = { version = "0.8.0", features = ["serde"] }
log = "0.4.33"
pretty_env_logger = "0.5.0"
serde = { version = "1.0.229", features = ["derive"] }
tokio = { version = "1.53.1", features = ["net", "rt", "macros", "time", "io-util", "fs"] }
tokio-util = "0.7.19"
toml = "1.1.4"

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# Mozilla Public License Version 2.0
1. Definitions
---
1.1. "Contributor" means each individual or legal entity that creates, contributes to the creation
of, or owns Covered Software.
1.2. "Contributor Version" means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution" means Covered Software of a particular Contributor.
1.4. "Covered Software" means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and Modifications of such Source
Code Form, in each case including portions thereof.
1.5. "Incompatible With Secondary Licenses" means
(a) that the initial Contributor has attached the notice described
in Exhibit B to the Covered Software; or
(b) that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the
terms of a Secondary License.
1.6. "Executable Form" means any form of the work other than Source Code Form.
1.7. "Larger Work" means a work that combines Covered Software with other material, in a separate
file or files, that is not Covered Software.
1.8. "License" means this document.
1.9. "Licensable" means having the right to grant, to the maximum extent possible, whether at the
time of the initial grant or subsequently, any and all of the rights conveyed by this License.
1.10. "Modifications" means any of the following:
(a) any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered
Software; or
(b) any new file in Source Code Form that contains any Covered
Software.
1.11. "Patent Claims" of a Contributor means any patent claim(s), including without limitation,
method, process, and apparatus claims, in any patent Licensable by such Contributor that would be
infringed, but for the grant of the License, by the making, using, selling, offering for sale,
having made, import, or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License" means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public License, Version 3.0, or any
later versions of those licenses.
1.13. "Source Code Form" means the form of the work preferred for making modifications.
1.14. "You" (or "Your") means an individual or a legal entity exercising rights under this License.
For legal entities, "You" includes any entity that controls, is controlled by, or is under common
control with You. For purposes of this definition, "control" means (a) the power, direct or
indirect, to cause the direction or management of such entity, whether by contract or otherwise, or
(b) ownership of more than fifty percent (50%) of the outstanding shares or beneficial ownership of
such entity.
2. License Grants and Conditions
---
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license:
(a) under intellectual property rights (other than patent or trademark) Licensable by such
Contributor to use, reproduce, make available, modify, display, perform, distribute, and otherwise
exploit its Contributions, either on an unmodified basis, with Modifications, or as part of a Larger
Work; and
(b) under Patent Claims of such Contributor to make, use, sell, offer for sale, have made, import,
and otherwise transfer either its Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution become effective for each
Contribution on the date the Contributor first distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under this License. No additional
rights or licenses will be implied from the distribution or licensing of Covered Software under this
License. Notwithstanding Section 2.1(b) above, no patent license is granted by a Contributor:
(a) for any code that a Contributor has removed from Covered Software; or
(b) for infringements caused by: (i) Your and any other third party's modifications of Covered
Software, or (ii) the combination of its Contributions with other software (except as part of its
Contributor Version); or
(c) under Patent Claims infringed by Covered Software in the absence of its Contributions.
This License does not grant any rights in the trademarks, service marks, or logos of any Contributor
(except as may be necessary to comply with the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to distribute the Covered Software
under a subsequent version of this License (see Section 10.2) or under the terms of a Secondary
License (if permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its Contributions are its original
creation(s) or it has sufficient rights to grant the rights to its Contributions conveyed by this
License.
2.6. Fair Use
This License is not intended to limit any rights You have under applicable copyright doctrines of
fair use, fair dealing, or other equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in Section 2.1.
3. Responsibilities
---
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any Modifications that You
create or to which You contribute, must be under the terms of this License. You must inform
recipients that the Source Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not attempt to alter or restrict
the recipients' rights in the Source Code Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
(a) such Covered Software must also be made available in Source Code Form, as described in Section
3.1, and You must inform recipients of the Executable Form how they can obtain a copy of such Source
Code Form by reasonable means in a timely manner, at a charge no more than the cost of distribution
to the recipient; and
(b) You may distribute such Executable Form under the terms of this License, or sublicense it under
different terms, provided that the license for the Executable Form does not attempt to limit or
alter the recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice, provided that You also
comply with the requirements of this License for the Covered Software. If the Larger Work is a
combination of Covered Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this License permits You to
additionally distribute such Covered Software under the terms of such Secondary License(s), so that
the recipient of the Larger Work may, at their option, further distribute the Covered Software under
the terms of either this License or such Secondary License(s).
3.4. Notices
You may not remove or alter the substance of any license notices (including copyright notices,
patent notices, disclaimers of warranty, or limitations of liability) contained within the Source
Code Form of the Covered Software, except that You may alter any license notices to the extent
required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability
obligations to one or more recipients of Covered Software. However, You may do so only on Your own
behalf, and not on behalf of any Contributor. You must make it absolutely clear that any such
warranty, support, indemnity, or liability obligation is offered by You alone, and You hereby agree
to indemnify every Contributor for any liability incurred by such Contributor as a result of
warranty, support, indemnity or liability terms You offer. You may include additional disclaimers of
warranty and limitations of liability specific to any jurisdiction.
4. Inability to Comply Due to Statute or Regulation
---
If it is impossible for You to comply with any of the terms of this License with respect to some or
all of the Covered Software due to statute, judicial order, or regulation then You must: (a) comply
with the terms of this License to the maximum extent possible; and (b) describe the limitations and
the code they affect. Such description must be placed in a text file included with all distributions
of the Covered Software under this License. Except to the extent prohibited by statute or
regulation, such description must be sufficiently detailed for a recipient of ordinary skill to be
able to understand it.
5. Termination
---
5.1. The rights granted under this License will terminate automatically if You fail to comply with
any of its terms. However, if You become compliant, then the rights granted under this License from
a particular Contributor are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing basis, if such Contributor
fails to notify You of the non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular Contributor are reinstated on an
ongoing basis if such Contributor notifies You of the non-compliance by some reasonable means, this
is the first time You have received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent infringement claim
(excluding declaratory judgment actions, counter-claims, and cross-claims) alleging that a
Contributor Version directly or indirectly infringes any patent, then the rights granted to You by
any and all Contributors for the Covered Software under Section 2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user license agreements
(excluding distributors and resellers) which have been validly granted by You or Your distributors
under this License prior to termination shall survive termination.
---
-
-
-
6. Disclaimer of Warranty *
- ------------------------- *
-
-
- Covered Software is provided under this License on an "as is" *
- basis, without warranty of any kind, either expressed, implied, or *
- statutory, including, without limitation, warranties that the *
- Covered Software is free of defects, merchantable, fit for a *
- particular purpose or non-infringing. The entire risk as to the *
- quality and performance of the Covered Software is with You. *
- Should any Covered Software prove defective in any respect, You *
- (not any Contributor) assume the cost of any necessary servicing, *
- repair, or correction. This disclaimer of warranty constitutes an *
- essential part of this License. No use of any Covered Software is *
- authorized under this License except under this disclaimer. *
-
-
---
---
-
-
-
7. Limitation of Liability *
- -------------------------- *
-
-
- Under no circumstances and under no legal theory, whether tort *
- (including negligence), contract, or otherwise, shall any *
- Contributor, or anyone who distributes Covered Software as *
- permitted above, be liable to You for any direct, indirect, *
- special, incidental, or consequential damages of any character *
- including, without limitation, damages for lost profits, loss of *
- goodwill, work stoppage, computer failure or malfunction, or any *
- and all other commercial damages or losses, even if such party *
- shall have been informed of the possibility of such damages. This *
- limitation of liability shall not apply to liability for death or *
- personal injury resulting from such party's negligence to the *
- extent applicable law prohibits such limitation. Some *
- jurisdictions do not allow the exclusion or limitation of *
- incidental or consequential damages, so this exclusion and *
- limitation may not apply to You. *
-
-
---
8. Litigation
---
Any litigation relating to this License may be brought only in the courts of a jurisdiction where
the defendant maintains its principal place of business and such litigation shall be governed by
laws of that jurisdiction, without reference to its conflict-of-law provisions. Nothing in this
Section shall prevent a party's ability to bring cross-claims or counter-claims.
9. Miscellaneous
---
This License represents the complete agreement concerning the subject matter hereof. If any
provision of this License is held to be unenforceable, such provision shall be reformed only to the
extent necessary to make it enforceable. Any law or regulation which provides that the language of a
contract shall be construed against the drafter shall not be used to construe this License against a
Contributor.
10. Versions of the License
---
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section 10.3, no one other than the
license steward has the right to modify or publish new versions of this License. Each version will
be given a distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version of the License under which
You originally received the Covered Software, or under the terms of any subsequent version published
by the license steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to create a new license for such
software, you may create and use a modified version of this License if you rename the license and
remove any references to the name of the license steward (except to note that such modified license
differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
If You choose to distribute Source Code Form that is Incompatible With Secondary Licenses under the
terms of this version of the License, the notice described in Exhibit B of this License must be
attached.
## Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file, then You may include the
notice in a location (such as a LICENSE file in a relevant directory) where a recipient would be
likely to look for such a notice.
You may add additional accurate notices of copyright ownership.
## Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public
License, v. 2.0.

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# multildap
Proxy LDAP requests to different LDAP servers based on base DN. Based on code from [kanidm/ldap-proxy](https://github.com/kanidm/ldap-proxy/) under the [MPL license](LICENSE.md).
## Features
- [x] No TLS setup ; use only in trusted networks
- [x] LDAP bind requests
- [x] LDAP search requests
## Configuration
Create a configuration file `config.toml` with the following:
```toml
[[mapping]]
from = "a.localhost"
to = "example.com"
backend = "127.0.0.1:4389"
[[mapping]]
from = "b.localhost"
to = "example.com"
backend = "127.0.0.1:5389"
```
## Running
```
cargo run -- --config config.toml
```

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use clap::Parser;
use std::path::PathBuf;
#[derive(Parser)]
#[command(version, about, long_about = None)]
pub struct Cli {
/// Sets a custom config file
#[arg(short, long, value_name = "FILE")]
pub config: PathBuf,
}

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use futures_util::sink::SinkExt;
use futures_util::stream::StreamExt;
use ldap3_proto::LdapCodec;
use ldap3_proto::control::LdapControl;
use ldap3_proto::proto::*;
use tokio::net::TcpStream;
use tokio::time::timeout;
use tokio_util::codec::{FramedRead, FramedWrite};
use std::time::Duration;
use crate::{CR, CW, LdapError};
pub struct BasicLdapClient {
r: FramedRead<CR, LdapCodec>,
w: FramedWrite<CW, LdapCodec>,
msg_counter: i32,
}
impl BasicLdapClient {
fn next_msgid(&mut self) -> i32 {
self.msg_counter += 1;
self.msg_counter
}
pub async fn build(addr: &str) -> Result<Self, LdapError> {
let tcpstream = match timeout(Duration::from_secs(1), TcpStream::connect(addr)).await {
Ok(Ok(t)) => {
trace!("connection established to {addr}");
t
}
Ok(Err(err)) => {
// trace!(?addr, ?err, "error");
error!("error to {addr}: {err}");
panic!();
}
Err(_) => {
warn!("timeout to {addr}");
panic!();
// continue;
}
};
let (r, w) = tokio::io::split(tcpstream);
let w = FramedWrite::new(w, LdapCodec::new(None, None));
let r = FramedRead::new(r, LdapCodec::new(None, None));
Ok(Self {
r,
w,
msg_counter: 0,
})
}
pub async fn bind(
&mut self,
lbr: LdapBindRequest,
ctrl: Vec<LdapControl>,
) -> Result<(LdapBindResponse, Vec<LdapControl>), LdapError> {
let ck_msgid = self.next_msgid();
let msg = LdapMsg {
msgid: ck_msgid,
op: LdapOp::BindRequest(lbr),
ctrl,
};
match self.w.send(msg).await {
Ok(_) => {}
Err(err) => {
error!("unable to transmit to ldap server: {err}");
return Err(LdapError::Transport);
}
};
match self.r.next().await {
Some(Ok(LdapMsg {
msgid,
op: LdapOp::BindResponse(bind_resp),
ctrl,
})) => {
if msgid == ck_msgid {
Ok((bind_resp, ctrl))
} else {
error!("invalid msgid, sequence error.");
Err(LdapError::InvalidProtocolState)
}
}
Some(Ok(msg)) => {
trace!("{:?}", msg);
Err(LdapError::InvalidProtocolState)
}
Some(Err(e)) => {
error!("unable to receive from ldap server: {e}");
Err(LdapError::Transport)
}
None => {
error!("connection closed");
Err(LdapError::Transport)
}
}
}
pub async fn search(
&mut self,
sr: LdapSearchRequest,
ctrl: Vec<LdapControl>,
) -> Result<
(
Vec<(LdapSearchResultEntry, Vec<LdapControl>)>,
LdapResult,
Vec<LdapControl>,
),
LdapError,
> {
let ck_msgid = self.next_msgid();
let msg = LdapMsg {
msgid: ck_msgid,
op: LdapOp::SearchRequest(sr),
ctrl,
};
match self.w.send(msg).await {
Ok(_) => {}
Err(err) => {
error!("unable to transmit to ldap server: {err}");
return Err(LdapError::Transport);
}
};
let mut entries = Vec::new();
loop {
match self.r.next().await {
// This terminates the iteration of entries.
Some(Ok(LdapMsg {
msgid,
op: LdapOp::SearchResultDone(search_res),
ctrl,
})) => {
if msgid == ck_msgid {
break Ok((entries, search_res, ctrl));
} else {
error!("invalid msgid, sequence error.");
break Err(LdapError::InvalidProtocolState);
}
}
Some(Ok(LdapMsg {
msgid,
op: LdapOp::SearchResultEntry(search_entry),
ctrl,
})) => {
if msgid == ck_msgid {
entries.push((search_entry, ctrl))
} else {
error!("invalid msgid, sequence error.");
break Err(LdapError::InvalidProtocolState);
}
}
Some(Ok(msg)) => {
trace!("{:?}", msg);
break Err(LdapError::InvalidProtocolState);
}
Some(Err(e)) => {
error!("unable to receive from ldap server: {e}");
break Err(LdapError::Transport);
}
None => {
error!("connection closed");
break Err(LdapError::Transport);
}
}
}
}
}

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use serde::Deserialize;
use std::path::Path;
#[derive(Clone, Debug, Deserialize)]
pub struct Config {
pub mapping: Vec<Mapping>,
}
impl Config {
pub async fn from_path(path: &Path) -> anyhow::Result<Self> {
let content = tokio::fs::read(path).await?;
Ok(toml::from_slice(&content)?)
}
}
#[derive(Clone, Debug, Deserialize)]
pub struct Mapping {
pub from: String,
pub to: String,
pub backend: String,
}

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use indexmap::IndexMap;
use ldap3::dn_escape;
use crate::LdapError;
/// A Dn is a key-value mapping which can contain the same key several times.
///
/// This implementation is not fully RFC compliant and will only parse simple DNs for
/// basic attribute manipulation.
///
/// Keys are lowercased, but scrambled keys in a broken order will be reordered. For example,
/// `dc=example,ou=people,dc=com` will become `dc=example,dc=com,ou=people`.
pub struct Dn {
pub keys: IndexMap<String, Vec<String>>,
}
impl Dn {
/// Parse a DN string. Here parsing escaped characters is not critical, if a
/// client sends us funny characters, the domain name simply won't match
/// and their request won't go anywhere.
///
/// However, if we find a really funny request such as `dc=foo=bar`, then
/// we return an error to the client.
pub fn from_dn_str(input: &str) -> Result<Self, LdapError> {
let mut keys: IndexMap<String, Vec<String>> = IndexMap::new();
for query in input.split(',') {
let mut query_parts = query.split('=');
// Here we have key=val pairs
if query_parts.clone().count() != 2 {
// Bad request
log::debug!("Invalid query DN: {input}");
return Err(LdapError::InvalidQuery);
}
let key = query_parts.next().unwrap();
let val = query_parts.next().unwrap();
if let Some(previous) = keys.get_mut(key) {
previous.push(val.to_string());
} else {
keys.insert(key.to_string(), vec![val.to_string()]);
}
}
Ok(Self { keys })
}
pub fn to_dn_string(&self) -> String {
let mut s = String::new();
let mut first = true;
for (key, values) in &self.keys {
for value in values {
if first {
first = false;
} else {
s.push(',');
}
s.push_str(key);
s.push('=');
s.push_str(value);
}
}
s
}
/// Gets the hostname defined in the `dc` fields of the DN.
///
/// For example, `dc=example,dc=com` becomes `Some(example.com)`.
///
/// The returned domain is not normalized and may require casing treatment
/// to compare meaningfully.
pub fn get_hostname(&self) -> Option<String> {
let domain_components = self.keys.get("dc")?;
// We don't populate the dc key if there was no value at all, so
// we have at least one component.
let mut domain_components = domain_components.iter();
let mut s = String::from(domain_components.next().unwrap());
for domain_component in domain_components {
s.push('.');
s.push_str(domain_component);
}
Some(s)
}
/// Overrides the DN hostname (`dc` fields) with the provided host.
///
/// When no `dc` fields are present, they are only added when `force` is true.
pub fn set_hostname(&mut self, host: &str, force: bool) {
let domain_components: Vec<String> =
host.split('.').map(|x| dn_escape(x).to_string()).collect();
if !force && !self.keys.contains_key("dc") {
return;
}
self.keys.insert("dc".to_string(), domain_components);
}
}

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#[macro_use]
extern crate log;
use clap::Parser;
use futures_util::StreamExt;
use ldap3_proto::LdapCodec;
use ldap3_proto::proto::*;
use tokio::io::{AsyncRead, AsyncWrite, ReadHalf, WriteHalf};
use tokio::net::{TcpListener, TcpStream};
use tokio::time::timeout;
use tokio_util::codec::{FramedRead, FramedWrite};
use std::sync::Arc;
use std::time::Duration;
mod cli;
use cli::Cli;
mod client;
use crate::client::BasicLdapClient;
mod config;
use config::Config;
mod dn;
mod op;
use crate::dn::Dn;
const LDAP_CLIENT_IO_TIMEOUT: Duration = Duration::from_secs(1);
type CR = ReadHalf<TcpStream>;
type CW = WriteHalf<TcpStream>;
#[derive(Debug, Clone)]
pub enum LdapError {
TlsError,
ConnectError,
Transport,
InvalidProtocolState,
InvalidQuery,
}
// We allow the large enum to exist as we always do a mem swap from unbound to authenticated, so
// the memory layout penalty doesn't apply.
#[allow(clippy::large_enum_variant)]
enum ClientState {
Unbound,
Authenticated {
#[allow(dead_code)]
request_dn: String,
backend_dn: String,
client: BasicLdapClient,
},
}
pub async fn client_process<W: AsyncWrite + Unpin, R: AsyncRead + Unpin>(
mut r: FramedRead<R, LdapCodec>,
mut w: FramedWrite<W, LdapCodec>,
config: Arc<Config>,
) {
info!("Received new connection");
// We always start unbound.
let mut state = ClientState::Unbound;
// Start to wait for incoming packets
while let Ok(Some(Ok(protomsg))) = timeout(LDAP_CLIENT_IO_TIMEOUT, r.next()).await {
let next_state = match (&mut state, protomsg) {
// Doesn't matter what state we are in, any bind will trigger this process.
(
_,
LdapMsg {
msgid,
op: LdapOp::BindRequest(lbr),
ctrl,
},
) => match op::bind::bind(&mut w, lbr, config.clone(), msgid, ctrl).await {
Ok(ns) => ns,
Err(_) => break,
},
// Unbinds are always actioned.
(
_,
LdapMsg {
msgid: _,
op: LdapOp::UnbindRequest,
ctrl: _,
},
) => {
break;
}
// Unbound handler
(
ClientState::Unbound,
LdapMsg {
msgid,
op: LdapOp::SearchRequest(sr),
ctrl,
},
) => {
// We have to trigger a bind first in case we have a mapping.
let lbr = LdapBindRequest {
dn: "".to_string(),
cred: LdapBindCred::Simple("".to_string()),
};
let mut next_state =
match op::bind::bind(&mut w, lbr, config.clone(), 0, Vec::default()).await {
Ok(ns) => ns,
Err(_) => break,
};
match &mut next_state {
Some(ClientState::Unbound) | None => {
error!("Invalid state, bind did not return an authenticated state!");
break;
}
Some(ClientState::Authenticated {
client,
request_dn: _,
backend_dn: _,
}) => {
let search_req = op::search::SearchRequest {
sr,
msgid,
ctrl,
client,
};
match op::search::search(&mut w, search_req).await {
Ok(()) => {}
Err(_) => break,
}
}
}
next_state
}
// Authenticated message handler.
// - Search
(
ClientState::Authenticated {
client,
backend_dn: _,
request_dn: _,
},
LdapMsg {
msgid,
op: LdapOp::SearchRequest(sr),
ctrl,
},
) => {
let search_req = op::search::SearchRequest {
sr,
msgid,
ctrl,
client,
};
match op::search::search(&mut w, search_req).await {
Ok(()) => None,
Err(_) => break,
}
}
// Extended Requests - Generally whoami.
(
ClientState::Authenticated {
request_dn: _,
backend_dn,
client: _,
},
LdapMsg {
msgid,
op: LdapOp::ExtendedRequest(ler),
ctrl: _,
},
) => match op::ext::extop(&mut w, ler, msgid, backend_dn).await {
Ok(ns) => ns,
Err(_) => break,
},
_ => {
log::debug!("unimplemented");
None
}
};
if let Some(next_state) = next_state {
// Update the client state, dropping any former state.
state = next_state;
}
}
}
#[tokio::main(flavor = "current_thread")]
async fn main() {
if let Err(_) = std::env::var("RUST_LOG") {
unsafe { std::env::set_var("RUST_LOG", "info"); }
}
pretty_env_logger::formatted_timed_builder()
.parse_default_env()
.init();
let cli = Cli::parse();
let config = match Config::from_path(&cli.config).await {
Ok(config) => config,
Err(e) => {
error!(
"Loading configuration file {} failed!",
cli.config.display()
);
error!("{}", e);
std::process::exit(1);
}
};
let state = Arc::new(config);
// Let the listening port ready.
let listener = TcpListener::bind("127.0.0.1:3389").await.unwrap();
info!("Listening on {:?}", listener);
loop {
match listener.accept().await {
Ok((tcpstream, client_socket_addr)) => {
log::debug!("New connection from {client_socket_addr}");
let (r, w) = tokio::io::split(tcpstream);
let r = FramedRead::new(r, LdapCodec::new(None, None));
let w = FramedWrite::new(w, LdapCodec::new(None, None));
tokio::spawn(client_process(r, w, state.clone()));
}
Err(_e) => continue,
}
}
}

120
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use futures_util::SinkExt;
use ldap3_proto::LdapCodec;
use ldap3_proto::control::*;
use ldap3_proto::proto::*;
use tokio::io::AsyncWrite;
use tokio_util::codec::FramedWrite;
use std::sync::Arc;
use crate::{BasicLdapClient, ClientState, Config, Dn, LdapError};
pub fn bind_operror(msgid: i32, msg: &str) -> LdapMsg {
LdapMsg {
msgid,
op: LdapOp::BindResponse(LdapBindResponse {
res: LdapResult {
code: LdapResultCode::OperationsError,
matcheddn: "".to_string(),
message: msg.to_string(),
referral: vec![],
},
saslcreds: None,
}),
ctrl: vec![],
}
}
pub async fn bind<W: AsyncWrite + Unpin>(
w: &mut FramedWrite<W, LdapCodec>,
mut lbr: LdapBindRequest,
config: Arc<Config>,
msgid: i32,
ctrl: Vec<LdapControl>,
) -> Result<Option<ClientState>, LdapError> {
trace!("{:?}", lbr);
let request_dn = lbr.dn.clone();
debug!("Received bind request on DN: {}", lbr.dn);
let mut dn = Dn::from_dn_str(&lbr.dn)?;
let Some(requested_domain) = dn.get_hostname() else {
debug!("No domain name CN found in DN: {}", lbr.dn);
return Err(LdapError::InvalidQuery);
};
// Lowercase the domain systematically to allow matches
let requested_domain = requested_domain.to_lowercase();
let Some(mapping) = config
.mapping
.iter()
.find(|x| x.from.to_lowercase() == requested_domain)
else {
debug!("No mapping found for domain {requested_domain}");
return Err(LdapError::InvalidQuery);
};
debug!(
"Redirecting {} to {} with domain {}",
requested_domain, mapping.backend, mapping.to
);
dn.set_hostname(&mapping.to, false);
lbr.dn = dn.to_dn_string();
let dn = lbr.dn.clone();
// We need the client to connect *and* bind to proceed here!
let mut client = match BasicLdapClient::build(&mapping.backend).await {
Ok(c) => c,
Err(e) => {
error!("A client build error has occurred: {e:?}");
let resp_msg = bind_operror(msgid, "unable to bind");
w.send(resp_msg).await.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
// Always bail.
return Ok(None);
}
};
let valid = match client.bind(lbr, ctrl).await {
Ok((bind_resp, ctrl)) => {
// Almost there, lets check the bind result.
let valid = bind_resp.res.code == LdapResultCode::Success;
let resp_msg = LdapMsg {
msgid,
op: LdapOp::BindResponse(bind_resp),
ctrl,
};
w.send(resp_msg).await.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
valid
}
Err(e) => {
error!("A client bind error has occurred: {e:?}");
let resp_msg = bind_operror(msgid, "unable to bind");
w.send(resp_msg).await.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
// Always bail.
return Ok(None);
}
};
if valid {
info!("Successful bind for {}", dn);
Ok(Some(ClientState::Authenticated {
request_dn,
backend_dn: dn,
client,
}))
} else {
Ok(None)
}
}

51
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use futures_util::SinkExt;
use ldap3_proto::LdapCodec;
use ldap3_proto::proto::*;
use tokio::io::AsyncWrite;
use tokio_util::codec::FramedWrite;
use crate::{ClientState, LdapError};
pub async fn extop<W: AsyncWrite + Unpin>(
w: &mut FramedWrite<W, LdapCodec>,
ler: LdapExtendedRequest,
msgid: i32,
display_dn: &str,
) -> Result<Option<ClientState>, LdapError> {
let op = match ler.name.as_str() {
"1.3.6.1.4.1.4203.1.11.3" => LdapOp::ExtendedResponse(LdapExtendedResponse {
res: LdapResult {
code: LdapResultCode::Success,
matcheddn: "".to_string(),
message: "".to_string(),
referral: vec![],
},
name: None,
value: Some(Vec::from(display_dn)),
}),
_ => LdapOp::ExtendedResponse(LdapExtendedResponse {
res: LdapResult {
code: LdapResultCode::OperationsError,
matcheddn: "".to_string(),
message: "".to_string(),
referral: vec![],
},
name: None,
value: None,
}),
};
w.send(LdapMsg {
msgid,
op,
ctrl: vec![],
})
.await
.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
Ok(None)
}

3
src/op/mod.rs Normal file
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pub mod bind;
pub mod ext;
pub mod search;

70
src/op/search.rs Normal file
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use futures_util::SinkExt;
use ldap3_proto::LdapCodec;
use ldap3_proto::control::*;
use ldap3_proto::proto::*;
use tokio::io::AsyncWrite;
use tokio_util::codec::FramedWrite;
use crate::op::bind::bind_operror;
use crate::{BasicLdapClient, LdapError};
pub struct SearchRequest<'a> {
pub sr: LdapSearchRequest,
pub msgid: i32,
pub ctrl: Vec<LdapControl>,
pub client: &'a mut BasicLdapClient,
}
pub async fn search<W: AsyncWrite + Unpin>(
w: &mut FramedWrite<W, LdapCodec>,
search_request: SearchRequest<'_>,
) -> Result<(), LdapError> {
let SearchRequest {
sr,
msgid,
ctrl,
client,
} = search_request;
let (entries, result, ctrl) = match client.search(sr, ctrl).await {
Ok(data) => data,
Err(e) => {
error!("A client search error has occurred: {e:?}");
let resp_msg = bind_operror(msgid, "unable to search");
w.send(resp_msg).await.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
// Error sent, return with no state change.
return Ok(());
}
};
for (entry, ctrl) in entries {
w.send(LdapMsg {
msgid,
op: LdapOp::SearchResultEntry(entry),
ctrl,
})
.await
.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
}
w.send(LdapMsg {
msgid,
op: LdapOp::SearchResultDone(result),
ctrl,
})
.await
.map_err(|err| {
error!("Unable to send response: {err}");
LdapError::Transport
})?;
// No state change
Ok(())
}