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Merge remote-tracking branch 'foo/master' into sasl-foo

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This commit is contained in:
Maxime “pep” Buquet 2023-08-17 23:31:04 +02:00
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target
Cargo.lock

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Version 0.5.0, released 2021-01-12:
* Important changes
- Relicensed to MPL-2.0 from LGPL-3.0-or-later.
- Made all of the errors into enums, instead of strings.
* Small changes
- Replaced rand\_os with getrandom.
- Bumped all dependencies.
Version 0.4.2, released 2018-05-19:
* Small changes
- Marc-Antoine Perennou updated the openssl and base64 dependencies to 0.10.4 and 0.9.0 respectively.
- lumi updated them further to 0.10.7 and 0.9.1 respectively.

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[package]
name = "sasl"
version = "0.5.0"
authors = ["lumi <lumi@pew.im>"]
description = "A crate for SASL authentication. Currently only does the client side."
homepage = "https://gitlab.com/xmpp-rs/sasl-rs"
repository = "https://gitlab.com/xmpp-rs/sasl-rs"
documentation = "https://docs.rs/sasl"
readme = "README.md"
keywords = ["sasl", "authentication"]
license = "MPL-2.0"
edition = "2018"
[badges]
gitlab = { repository = "xmpp-rs/sasl-rs" }
[features]
default = ["scram", "anonymous"]
scram = ["base64", "getrandom", "sha-1", "sha2", "hmac", "pbkdf2"]
anonymous = ["getrandom"]
[dependencies]
base64 = { version = "0.20", optional = true }
getrandom = { version = "0.2", optional = true }
sha-1 = { version = "0.10", optional = true }
sha2 = { version = "0.10", optional = true }
hmac = { version = "0.12", optional = true }
pbkdf2 = { version = "0.11", default-features = false, optional = true }

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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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sasl-rs
=======
What's this?
------------
A crate which handles SASL authentication. Still unstable until 1.0.0.
Can I see an example?
---------------------
Look at the documentation [here](https://docs.rs/sasl).
What license is it under?
-------------------------
MPL-2.0. See `LICENSE`.
License yadda yadda.
--------------------
Copyright 2017, sasl-rs contributors.
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 https://mozilla.org/MPL/2.0/.

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//! Provides the SASL "ANONYMOUS" mechanism.
use crate::client::{Mechanism, MechanismError};
use crate::common::{Credentials, Secret};
/// A struct for the SASL ANONYMOUS mechanism.
pub struct Anonymous;
impl Anonymous {
/// Constructs a new struct for authenticating using the SASL ANONYMOUS mechanism.
///
/// It is recommended that instead you use a `Credentials` struct and turn it into the
/// requested mechanism using `from_credentials`.
pub fn new() -> Anonymous {
Anonymous
}
}
impl Mechanism for Anonymous {
fn name(&self) -> &str {
"ANONYMOUS"
}
fn from_credentials(credentials: Credentials) -> Result<Anonymous, MechanismError> {
if let Secret::None = credentials.secret {
Ok(Anonymous)
} else {
Err(MechanismError::AnonymousRequiresNoCredentials)
}
}
}

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//! Provides a few SASL mechanisms.
mod anonymous;
mod plain;
#[cfg(feature = "scram")]
mod scram;
pub use self::anonymous::Anonymous;
pub use self::plain::Plain;
#[cfg(feature = "scram")]
pub use self::scram::Scram;

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//! Provides the SASL "PLAIN" mechanism.
use crate::client::{Mechanism, MechanismError};
use crate::common::{Credentials, Identity, Password, Secret};
/// A struct for the SASL PLAIN mechanism.
pub struct Plain {
username: String,
password: String,
}
impl Plain {
/// Constructs a new struct for authenticating using the SASL PLAIN mechanism.
///
/// It is recommended that instead you use a `Credentials` struct and turn it into the
/// requested mechanism using `from_credentials`.
pub fn new<N: Into<String>, P: Into<String>>(username: N, password: P) -> Plain {
Plain {
username: username.into(),
password: password.into(),
}
}
}
impl Mechanism for Plain {
fn name(&self) -> &str {
"PLAIN"
}
fn from_credentials(credentials: Credentials) -> Result<Plain, MechanismError> {
if let Secret::Password(Password::Plain(password)) = credentials.secret {
if let Identity::Username(username) = credentials.identity {
Ok(Plain::new(username, password))
} else {
Err(MechanismError::PlainRequiresUsername)
}
} else {
Err(MechanismError::PlainRequiresPlaintextPassword)
}
}
fn initial(&mut self) -> Vec<u8> {
let mut auth = Vec::new();
auth.push(0);
auth.extend(self.username.bytes());
auth.push(0);
auth.extend(self.password.bytes());
auth
}
}

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//! Provides the SASL "SCRAM-*" mechanisms and a way to implement more.
use base64;
use crate::client::{Mechanism, MechanismError};
use crate::common::scram::{generate_nonce, ScramProvider};
use crate::common::{parse_frame, xor, ChannelBinding, Credentials, Identity, Password, Secret};
use crate::error::Error;
use std::marker::PhantomData;
enum ScramState {
Init,
SentInitialMessage {
initial_message: Vec<u8>,
gs2_header: Vec<u8>,
},
GotServerData {
server_signature: Vec<u8>,
},
}
/// A struct for the SASL SCRAM-* and SCRAM-*-PLUS mechanisms.
pub struct Scram<S: ScramProvider> {
name: String,
username: String,
password: Password,
client_nonce: String,
state: ScramState,
channel_binding: ChannelBinding,
_marker: PhantomData<S>,
}
impl<S: ScramProvider> Scram<S> {
/// Constructs a new struct for authenticating using the SASL SCRAM-* and SCRAM-*-PLUS
/// mechanisms, depending on the passed channel binding.
///
/// It is recommended that instead you use a `Credentials` struct and turn it into the
/// requested mechanism using `from_credentials`.
pub fn new<N: Into<String>, P: Into<Password>>(
username: N,
password: P,
channel_binding: ChannelBinding,
) -> Result<Scram<S>, Error> {
Ok(Scram {
name: format!("SCRAM-{}", S::name()),
username: username.into(),
password: password.into(),
client_nonce: generate_nonce()?,
state: ScramState::Init,
channel_binding: channel_binding,
_marker: PhantomData,
})
}
// Used for testing.
#[doc(hidden)]
#[cfg(test)]
pub fn new_with_nonce<N: Into<String>, P: Into<Password>>(
username: N,
password: P,
nonce: String,
) -> Scram<S> {
Scram {
name: format!("SCRAM-{}", S::name()),
username: username.into(),
password: password.into(),
client_nonce: nonce,
state: ScramState::Init,
channel_binding: ChannelBinding::None,
_marker: PhantomData,
}
}
}
impl<S: ScramProvider> Mechanism for Scram<S> {
fn name(&self) -> &str {
// TODO: this is quite the workaround…
&self.name
}
fn from_credentials(credentials: Credentials) -> Result<Scram<S>, MechanismError> {
if let Secret::Password(password) = credentials.secret {
if let Identity::Username(username) = credentials.identity {
Scram::new(username, password, credentials.channel_binding)
.map_err(|_| MechanismError::CannotGenerateNonce)
} else {
Err(MechanismError::ScramRequiresUsername)
}
} else {
Err(MechanismError::ScramRequiresPassword)
}
}
fn initial(&mut self) -> Vec<u8> {
let mut gs2_header = Vec::new();
gs2_header.extend(self.channel_binding.header());
let mut bare = Vec::new();
bare.extend(b"n=");
bare.extend(self.username.bytes());
bare.extend(b",r=");
bare.extend(self.client_nonce.bytes());
let mut data = Vec::new();
data.extend(&gs2_header);
data.extend(bare.clone());
self.state = ScramState::SentInitialMessage {
initial_message: bare,
gs2_header: gs2_header,
};
data
}
fn response(&mut self, challenge: &[u8]) -> Result<Vec<u8>, MechanismError> {
let next_state;
let ret;
match self.state {
ScramState::SentInitialMessage {
ref initial_message,
ref gs2_header,
} => {
let frame =
parse_frame(challenge).map_err(|_| MechanismError::CannotDecodeChallenge)?;
let server_nonce = frame.get("r");
let salt = frame.get("s").and_then(|v| base64::decode(v).ok());
let iterations = frame.get("i").and_then(|v| v.parse().ok());
let server_nonce = server_nonce.ok_or_else(|| MechanismError::NoServerNonce)?;
let salt = salt.ok_or_else(|| MechanismError::NoServerSalt)?;
let iterations = iterations.ok_or_else(|| MechanismError::NoServerIterations)?;
// TODO: SASLprep
let mut client_final_message_bare = Vec::new();
client_final_message_bare.extend(b"c=");
let mut cb_data: Vec<u8> = Vec::new();
cb_data.extend(gs2_header);
cb_data.extend(self.channel_binding.data());
client_final_message_bare.extend(base64::encode(&cb_data).bytes());
client_final_message_bare.extend(b",r=");
client_final_message_bare.extend(server_nonce.bytes());
let salted_password = S::derive(&self.password, &salt, iterations)?;
let client_key = S::hmac(b"Client Key", &salted_password)?;
let server_key = S::hmac(b"Server Key", &salted_password)?;
let mut auth_message = Vec::new();
auth_message.extend(initial_message);
auth_message.push(b',');
auth_message.extend(challenge);
auth_message.push(b',');
auth_message.extend(&client_final_message_bare);
let stored_key = S::hash(&client_key);
let client_signature = S::hmac(&auth_message, &stored_key)?;
let client_proof = xor(&client_key, &client_signature);
let server_signature = S::hmac(&auth_message, &server_key)?;
let mut client_final_message = Vec::new();
client_final_message.extend(&client_final_message_bare);
client_final_message.extend(b",p=");
client_final_message.extend(base64::encode(&client_proof).bytes());
next_state = ScramState::GotServerData {
server_signature: server_signature,
};
ret = client_final_message;
}
_ => {
return Err(MechanismError::InvalidState);
}
}
self.state = next_state;
Ok(ret)
}
fn success(&mut self, data: &[u8]) -> Result<(), MechanismError> {
let frame = parse_frame(data).map_err(|_| MechanismError::CannotDecodeSuccessResponse)?;
match self.state {
ScramState::GotServerData {
ref server_signature,
} => {
if let Some(sig) = frame.get("v").and_then(|v| base64::decode(&v).ok()) {
if sig == *server_signature {
Ok(())
} else {
Err(MechanismError::InvalidSignatureInSuccessResponse)
}
} else {
Err(MechanismError::NoSignatureInSuccessResponse)
}
}
_ => Err(MechanismError::InvalidState),
}
}
}
#[cfg(test)]
mod tests {
use crate::client::mechanisms::Scram;
use crate::client::Mechanism;
use crate::common::scram::{Sha1, Sha256};
#[test]
fn scram_sha1_works() {
// Source: https://wiki.xmpp.org/web/SASLandSCRAM-SHA-1
let username = "user";
let password = "pencil";
let client_nonce = "fyko+d2lbbFgONRv9qkxdawL";
let client_init = b"n,,n=user,r=fyko+d2lbbFgONRv9qkxdawL";
let server_init = b"r=fyko+d2lbbFgONRv9qkxdawL3rfcNHYJY1ZVvWVs7j,s=QSXCR+Q6sek8bf92,i=4096";
let client_final =
b"c=biws,r=fyko+d2lbbFgONRv9qkxdawL3rfcNHYJY1ZVvWVs7j,p=v0X8v3Bz2T0CJGbJQyF0X+HI4Ts=";
let server_final = b"v=rmF9pqV8S7suAoZWja4dJRkFsKQ=";
let mut mechanism =
Scram::<Sha1>::new_with_nonce(username, password, client_nonce.to_owned());
let init = mechanism.initial();
assert_eq!(
String::from_utf8(init.clone()).unwrap(),
String::from_utf8(client_init[..].to_owned()).unwrap()
); // depends on ordering…
let resp = mechanism.response(&server_init[..]).unwrap();
assert_eq!(
String::from_utf8(resp.clone()).unwrap(),
String::from_utf8(client_final[..].to_owned()).unwrap()
); // again, depends on ordering…
mechanism.success(&server_final[..]).unwrap();
}
#[test]
fn scram_sha256_works() {
// Source: RFC 7677
let username = "user";
let password = "pencil";
let client_nonce = "rOprNGfwEbeRWgbNEkqO";
let client_init = b"n,,n=user,r=rOprNGfwEbeRWgbNEkqO";
let server_init = b"r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,s=W22ZaJ0SNY7soEsUEjb6gQ==,i=4096";
let client_final = b"c=biws,r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,p=dHzbZapWIk4jUhN+Ute9ytag9zjfMHgsqmmiz7AndVQ=";
let server_final = b"v=6rriTRBi23WpRR/wtup+mMhUZUn/dB5nLTJRsjl95G4=";
let mut mechanism =
Scram::<Sha256>::new_with_nonce(username, password, client_nonce.to_owned());
let init = mechanism.initial();
assert_eq!(
String::from_utf8(init.clone()).unwrap(),
String::from_utf8(client_init[..].to_owned()).unwrap()
); // depends on ordering…
let resp = mechanism.response(&server_init[..]).unwrap();
assert_eq!(
String::from_utf8(resp.clone()).unwrap(),
String::from_utf8(client_final[..].to_owned()).unwrap()
); // again, depends on ordering…
mechanism.success(&server_final[..]).unwrap();
}
}

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use std::fmt;
use crate::common::Credentials;
#[cfg(feature = "scram")]
use crate::common::scram::DeriveError;
#[cfg(feature = "scram")]
use hmac::digest::InvalidLength;
#[derive(Debug, PartialEq)]
pub enum MechanismError {
AnonymousRequiresNoCredentials,
PlainRequiresUsername,
PlainRequiresPlaintextPassword,
CannotGenerateNonce,
ScramRequiresUsername,
ScramRequiresPassword,
CannotDecodeChallenge,
NoServerNonce,
NoServerSalt,
NoServerIterations,
#[cfg(feature = "scram")]
DeriveError(DeriveError),
#[cfg(feature = "scram")]
InvalidKeyLength(InvalidLength),
InvalidState,
CannotDecodeSuccessResponse,
InvalidSignatureInSuccessResponse,
NoSignatureInSuccessResponse,
}
#[cfg(feature = "scram")]
impl From<DeriveError> for MechanismError {
fn from(err: DeriveError) -> MechanismError {
MechanismError::DeriveError(err)
}
}
#[cfg(feature = "scram")]
impl From<InvalidLength> for MechanismError {
fn from(err: InvalidLength) -> MechanismError {
MechanismError::InvalidKeyLength(err)
}
}
impl fmt::Display for MechanismError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(
fmt,
"{}",
match self {
MechanismError::AnonymousRequiresNoCredentials =>
"ANONYMOUS mechanism requires no credentials",
MechanismError::PlainRequiresUsername => "PLAIN requires a username",
MechanismError::PlainRequiresPlaintextPassword =>
"PLAIN requires a plaintext password",
MechanismError::CannotGenerateNonce => "can't generate nonce",
MechanismError::ScramRequiresUsername => "SCRAM requires a username",
MechanismError::ScramRequiresPassword => "SCRAM requires a password",
MechanismError::CannotDecodeChallenge => "can't decode challenge",
MechanismError::NoServerNonce => "no server nonce",
MechanismError::NoServerSalt => "no server salt",
MechanismError::NoServerIterations => "no server iterations",
#[cfg(feature = "scram")]
MechanismError::DeriveError(err) => return write!(fmt, "derive error: {}", err),
#[cfg(feature = "scram")]
MechanismError::InvalidKeyLength(err) =>
return write!(fmt, "invalid key length: {}", err),
MechanismError::InvalidState => "not in the right state to receive this response",
MechanismError::CannotDecodeSuccessResponse => "can't decode success response",
MechanismError::InvalidSignatureInSuccessResponse =>
"invalid signature in success response",
MechanismError::NoSignatureInSuccessResponse => "no signature in success response",
}
)
}
}
impl std::error::Error for MechanismError {}
/// A trait which defines SASL mechanisms.
pub trait Mechanism {
/// The name of the mechanism.
fn name(&self) -> &str;
/// Creates this mechanism from `Credentials`.
fn from_credentials(credentials: Credentials) -> Result<Self, MechanismError>
where
Self: Sized;
/// Provides initial payload of the SASL mechanism.
fn initial(&mut self) -> Vec<u8> {
Vec::new()
}
/// Creates a response to the SASL challenge.
fn response(&mut self, _challenge: &[u8]) -> Result<Vec<u8>, MechanismError> {
Ok(Vec::new())
}
/// Verifies the server success response, if there is one.
fn success(&mut self, _data: &[u8]) -> Result<(), MechanismError> {
Ok(())
}
}
pub mod mechanisms;

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use std::collections::HashMap;
use std::convert::From;
use std::string::FromUtf8Error;
#[cfg(feature = "scram")]
pub mod scram;
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Identity {
None,
Username(String),
}
impl From<String> for Identity {
fn from(s: String) -> Identity {
Identity::Username(s)
}
}
impl<'a> From<&'a str> for Identity {
fn from(s: &'a str) -> Identity {
Identity::Username(s.to_owned())
}
}
/// A struct containing SASL credentials.
#[derive(Clone, Debug)]
pub struct Credentials {
/// The requested identity.
pub identity: Identity,
/// The secret used to authenticate.
pub secret: Secret,
/// Channel binding data, for *-PLUS mechanisms.
pub channel_binding: ChannelBinding,
}
impl Default for Credentials {
fn default() -> Credentials {
Credentials {
identity: Identity::None,
secret: Secret::None,
channel_binding: ChannelBinding::Unsupported,
}
}
}
impl Credentials {
/// Creates a new Credentials with the specified username.
pub fn with_username<N: Into<String>>(mut self, username: N) -> Credentials {
self.identity = Identity::Username(username.into());
self
}
/// Creates a new Credentials with the specified plaintext password.
pub fn with_password<P: Into<String>>(mut self, password: P) -> Credentials {
self.secret = Secret::password_plain(password);
self
}
/// Creates a new Credentials with the specified chanel binding.
pub fn with_channel_binding(mut self, channel_binding: ChannelBinding) -> Credentials {
self.channel_binding = channel_binding;
self
}
}
/// Represents a SASL secret, like a password.
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Secret {
/// No extra data needed.
None,
/// Password required.
Password(Password),
}
impl Secret {
pub fn password_plain<S: Into<String>>(password: S) -> Secret {
Secret::Password(Password::Plain(password.into()))
}
pub fn password_pbkdf2<S: Into<String>>(
method: S,
salt: Vec<u8>,
iterations: u32,
data: Vec<u8>,
) -> Secret {
Secret::Password(Password::Pbkdf2 {
method: method.into(),
salt: salt,
iterations: iterations,
data: data,
})
}
}
/// Represents a password.
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Password {
/// A plaintext password.
Plain(String),
/// A password digest derived using PBKDF2.
Pbkdf2 {
method: String,
salt: Vec<u8>,
iterations: u32,
data: Vec<u8>,
},
}
impl From<String> for Password {
fn from(s: String) -> Password {
Password::Plain(s)
}
}
impl<'a> From<&'a str> for Password {
fn from(s: &'a str) -> Password {
Password::Plain(s.to_owned())
}
}
#[cfg(test)]
#[test]
fn xor_works() {
assert_eq!(
xor(
&[135, 94, 53, 134, 73, 233, 140, 221, 150, 12, 96, 111, 54, 66, 11, 76],
&[163, 9, 122, 180, 107, 44, 22, 252, 248, 134, 112, 82, 84, 122, 56, 209]
),
&[36, 87, 79, 50, 34, 197, 154, 33, 110, 138, 16, 61, 98, 56, 51, 157]
);
}
#[doc(hidden)]
pub fn xor(a: &[u8], b: &[u8]) -> Vec<u8> {
assert_eq!(a.len(), b.len());
let mut ret = Vec::with_capacity(a.len());
for (a, b) in a.into_iter().zip(b) {
ret.push(a ^ b);
}
ret
}
#[doc(hidden)]
pub fn parse_frame(frame: &[u8]) -> Result<HashMap<String, String>, FromUtf8Error> {
let inner = String::from_utf8(frame.to_owned())?;
let mut ret = HashMap::new();
for s in inner.split(',') {
let mut tmp = s.splitn(2, '=');
let key = tmp.next();
let val = tmp.next();
match (key, val) {
(Some(k), Some(v)) => {
ret.insert(k.to_owned(), v.to_owned());
}
_ => (),
}
}
Ok(ret)
}
/// Channel binding configuration.
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum ChannelBinding {
/// No channel binding data.
None,
/// Advertise that the client does not think the server supports channel binding.
Unsupported,
/// p=tls-unique channel binding data.
TlsUnique(Vec<u8>),
}
impl ChannelBinding {
/// Return the gs2 header for this channel binding mechanism.
pub fn header(&self) -> &[u8] {
match *self {
ChannelBinding::None => b"n,,",
ChannelBinding::Unsupported => b"y,,",
ChannelBinding::TlsUnique(_) => b"p=tls-unique,,",
}
}
/// Return the channel binding data for this channel binding mechanism.
pub fn data(&self) -> &[u8] {
match *self {
ChannelBinding::None => &[],
ChannelBinding::Unsupported => &[],
ChannelBinding::TlsUnique(ref data) => data,
}
}
/// Checks whether this channel binding mechanism is supported.
pub fn supports(&self, mechanism: &str) -> bool {
match *self {
ChannelBinding::None => false,
ChannelBinding::Unsupported => false,
ChannelBinding::TlsUnique(_) => mechanism == "tls-unique",
}
}
}

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use getrandom::{getrandom, Error as RngError};
use hmac::{digest::InvalidLength, Hmac, Mac};
use pbkdf2::pbkdf2;
use sha1::{Digest, Sha1 as Sha1_hash};
use sha2::Sha256 as Sha256_hash;
use crate::common::Password;
use crate::secret;
use base64;
/// Generate a nonce for SCRAM authentication.
pub fn generate_nonce() -> Result<String, RngError> {
let mut data = [0u8; 32];
getrandom(&mut data)?;
Ok(base64::encode(&data))
}
#[derive(Debug, PartialEq)]
pub enum DeriveError {
IncompatibleHashingMethod(String, String),
IncorrectSalt,
IncompatibleIterationCount(u32, u32),
}
impl std::fmt::Display for DeriveError {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
DeriveError::IncompatibleHashingMethod(one, two) => {
write!(fmt, "incompatible hashing method, {} is not {}", one, two)
}
DeriveError::IncorrectSalt => write!(fmt, "incorrect salt"),
DeriveError::IncompatibleIterationCount(one, two) => {
write!(fmt, "incompatible iteration count, {} is not {}", one, two)
}
}
}
}
impl std::error::Error for DeriveError {}
/// A trait which defines the needed methods for SCRAM.
pub trait ScramProvider {
/// The kind of secret this `ScramProvider` requires.
type Secret: secret::Secret;
/// The name of the hash function.
fn name() -> &'static str;
/// A function which hashes the data using the hash function.
fn hash(data: &[u8]) -> Vec<u8>;
/// A function which performs an HMAC using the hash function.
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidLength>;
/// A function which does PBKDF2 key derivation using the hash function.
fn derive(data: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError>;
}
/// A `ScramProvider` which provides SCRAM-SHA-1 and SCRAM-SHA-1-PLUS
pub struct Sha1;
impl ScramProvider for Sha1 {
type Secret = secret::Pbkdf2Sha1;
fn name() -> &'static str {
"SHA-1"
}
fn hash(data: &[u8]) -> Vec<u8> {
let hash = Sha1_hash::digest(data);
let mut vec = Vec::with_capacity(Sha1_hash::output_size());
vec.extend_from_slice(hash.as_slice());
vec
}
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidLength> {
type HmacSha1 = Hmac<Sha1_hash>;
let mut mac = HmacSha1::new_from_slice(key)?;
mac.update(data);
let result = mac.finalize();
let mut vec = Vec::with_capacity(Sha1_hash::output_size());
vec.extend_from_slice(result.into_bytes().as_slice());
Ok(vec)
}
fn derive(password: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError> {
match *password {
Password::Plain(ref plain) => {
let mut result = vec![0; 20];
pbkdf2::<Hmac<Sha1_hash>>(plain.as_bytes(), salt, iterations, &mut result);
Ok(result)
}
Password::Pbkdf2 {
ref method,
salt: ref my_salt,
iterations: my_iterations,
ref data,
} => {
if method != Self::name() {
Err(DeriveError::IncompatibleHashingMethod(
method.to_string(),
Self::name().to_string(),
))
} else if my_salt == &salt {
Err(DeriveError::IncorrectSalt)
} else if my_iterations == iterations {
Err(DeriveError::IncompatibleIterationCount(
my_iterations,
iterations,
))
} else {
Ok(data.to_vec())
}
}
}
}
}
/// A `ScramProvider` which provides SCRAM-SHA-256 and SCRAM-SHA-256-PLUS
pub struct Sha256;
impl ScramProvider for Sha256 {
type Secret = secret::Pbkdf2Sha256;
fn name() -> &'static str {
"SHA-256"
}
fn hash(data: &[u8]) -> Vec<u8> {
let hash = Sha256_hash::digest(data);
let mut vec = Vec::with_capacity(Sha256_hash::output_size());
vec.extend_from_slice(hash.as_slice());
vec
}
fn hmac(data: &[u8], key: &[u8]) -> Result<Vec<u8>, InvalidLength> {
type HmacSha256 = Hmac<Sha256_hash>;
let mut mac = HmacSha256::new_from_slice(key)?;
mac.update(data);
let result = mac.finalize();
let mut vec = Vec::with_capacity(Sha256_hash::output_size());
vec.extend_from_slice(result.into_bytes().as_slice());
Ok(vec)
}
fn derive(password: &Password, salt: &[u8], iterations: u32) -> Result<Vec<u8>, DeriveError> {
match *password {
Password::Plain(ref plain) => {
let mut result = vec![0; 32];
pbkdf2::<Hmac<Sha256_hash>>(plain.as_bytes(), salt, iterations, &mut result);
Ok(result)
}
Password::Pbkdf2 {
ref method,
salt: ref my_salt,
iterations: my_iterations,
ref data,
} => {
if method != Self::name() {
Err(DeriveError::IncompatibleHashingMethod(
method.to_string(),
Self::name().to_string(),
))
} else if my_salt == &salt {
Err(DeriveError::IncorrectSalt)
} else if my_iterations == iterations {
Err(DeriveError::IncompatibleIterationCount(
my_iterations,
iterations,
))
} else {
Ok(data.to_vec())
}
}
}
}
}

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#[cfg(feature = "scram")]
use getrandom::Error as RngError;
/// A wrapper enum for things that could go wrong in this crate.
#[derive(Debug)]
pub enum Error {
#[cfg(feature = "scram")]
/// An error while initializing the Rng.
RngError(RngError),
/// An error in a SASL mechanism.
SaslError(String),
}
#[cfg(feature = "scram")]
impl From<RngError> for Error {
fn from(err: RngError) -> Error {
Error::RngError(err)
}
}

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//#![deny(missing_docs)]
//! This crate provides a framework for SASL authentication and a few authentication mechanisms.
//!
//! # Examples
//!
//! ## Simple client-sided usage
//!
//! ```rust
//! use sasl::client::Mechanism;
//! use sasl::common::Credentials;
//! use sasl::client::mechanisms::Plain;
//!
//! let creds = Credentials::default()
//! .with_username("user")
//! .with_password("pencil");
//!
//! let mut mechanism = Plain::from_credentials(creds).unwrap();
//!
//! let initial_data = mechanism.initial();
//!
//! assert_eq!(initial_data, b"\0user\0pencil");
//! ```
//!
//! ## More complex usage
//!
//! ```rust,ignore
//! #[macro_use] extern crate sasl;
//!
//! use sasl::server::{Validator, Provider, Mechanism as ServerMechanism, Response};
//! use sasl::server::{ValidatorError, ProviderError, MechanismError as ServerMechanismError};
//! use sasl::server::mechanisms::{Plain as ServerPlain, Scram as ServerScram};
//! use sasl::client::{Mechanism as ClientMechanism, MechanismError as ClientMechanismError};
//! use sasl::client::mechanisms::{Plain as ClientPlain, Scram as ClientScram};
//! use sasl::common::{Identity, Credentials, Password, ChannelBinding};
//! use sasl::common::scram::{ScramProvider, Sha1, Sha256};
//! use sasl::secret;
//!
//! const USERNAME: &'static str = "user";
//! const PASSWORD: &'static str = "pencil";
//! const SALT: [u8; 8] = [35, 71, 92, 105, 212, 219, 114, 93];
//! const ITERATIONS: u32 = 4096;
//!
//! struct MyValidator;
//!
//! impl Validator<secret::Plain> for MyValidator {
//! fn validate(&self, identity: &Identity, value: &secret::Plain) -> Result<(), ValidatorError> {
//! let &secret::Plain(ref password) = value;
//! if identity != &Identity::Username(USERNAME.to_owned()) {
//! Err(ValidatorError::AuthenticationFailed)
//! }
//! else if password != PASSWORD {
//! Err(ValidatorError::AuthenticationFailed)
//! }
//! else {
//! Ok(())
//! }
//! }
//! }
//!
//! impl Provider<secret::Pbkdf2Sha1> for MyValidator {
//! fn provide(&self, identity: &Identity) -> Result<secret::Pbkdf2Sha1, ProviderError> {
//! if identity != &Identity::Username(USERNAME.to_owned()) {
//! Err(ProviderError::AuthenticationFailed)
//! }
//! else {
//! let digest = sasl::common::scram::Sha1::derive
//! ( &Password::Plain((PASSWORD.to_owned()))
//! , &SALT[..]
//! , ITERATIONS )?;
//! Ok(secret::Pbkdf2Sha1 {
//! salt: SALT.to_vec(),
//! iterations: ITERATIONS,
//! digest: digest,
//! })
//! }
//! }
//! }
//!
//! impl_validator_using_provider!(MyValidator, secret::Pbkdf2Sha1);
//!
//! impl Provider<secret::Pbkdf2Sha256> for MyValidator {
//! fn provide(&self, identity: &Identity) -> Result<secret::Pbkdf2Sha256, ProviderError> {
//! if identity != &Identity::Username(USERNAME.to_owned()) {
//! Err(ProviderError::AuthenticationFailed)
//! }
//! else {
//! let digest = sasl::common::scram::Sha256::derive
//! ( &Password::Plain((PASSWORD.to_owned()))
//! , &SALT[..]
//! , ITERATIONS )?;
//! Ok(secret::Pbkdf2Sha256 {
//! salt: SALT.to_vec(),
//! iterations: ITERATIONS,
//! digest: digest,
//! })
//! }
//! }
//! }
//!
//! impl_validator_using_provider!(MyValidator, secret::Pbkdf2Sha256);
//!
//! #[derive(Debug, PartialEq)]
//! enum MechanismError {
//! Client(ClientMechanismError),
//! Server(ServerMechanismError),
//! }
//!
//! impl From<ClientMechanismError> for MechanismError {
//! fn from(err: ClientMechanismError) -> MechanismError {
//! MechanismError::Client(err)
//! }
//! }
//!
//! impl From<ServerMechanismError> for MechanismError {
//! fn from(err: ServerMechanismError) -> MechanismError {
//! MechanismError::Server(err)
//! }
//! }
//!
//! fn finish<CM, SM>(cm: &mut CM, sm: &mut SM) -> Result<Identity, MechanismError>
//! where CM: ClientMechanism,
//! SM: ServerMechanism {
//! let init = cm.initial();
//! println!("C: {}", String::from_utf8_lossy(&init));
//! let mut resp = sm.respond(&init)?;
//! loop {
//! let msg;
//! match resp {
//! Response::Proceed(ref data) => {
//! println!("S: {}", String::from_utf8_lossy(&data));
//! msg = cm.response(data)?;
//! println!("C: {}", String::from_utf8_lossy(&msg));
//! },
//! _ => break,
//! }
//! resp = sm.respond(&msg)?;
//! }
//! if let Response::Success(ret, fin) = resp {
//! println!("S: {}", String::from_utf8_lossy(&fin));
//! cm.success(&fin)?;
//! Ok(ret)
//! }
//! else {
//! unreachable!();
//! }
//! }
//!
//! fn main() {
//! let mut mech = ServerPlain::new(MyValidator);
//! let expected_response = Response::Success(Identity::Username("user".to_owned()), Vec::new());
//! assert_eq!(mech.respond(b"\0user\0pencil"), Ok(expected_response));
//!
//! let mut mech = ServerPlain::new(MyValidator);
//! assert_eq!(mech.respond(b"\0user\0marker"), Err(ServerMechanismError::ValidatorError(ValidatorError::AuthenticationFailed)));
//!
//! let creds = Credentials::default()
//! .with_username(USERNAME)
//! .with_password(PASSWORD);
//! let mut client_mech = ClientPlain::from_credentials(creds.clone()).unwrap();
//! let mut server_mech = ServerPlain::new(MyValidator);
//!
//! assert_eq!(finish(&mut client_mech, &mut server_mech), Ok(Identity::Username(USERNAME.to_owned())));
//!
//! let mut client_mech = ClientScram::<Sha1>::from_credentials(creds.clone()).unwrap();
//! let mut server_mech = ServerScram::<Sha1, _>::new(MyValidator, ChannelBinding::Unsupported);
//!
//! assert_eq!(finish(&mut client_mech, &mut server_mech), Ok(Identity::Username(USERNAME.to_owned())));
//!
//! let mut client_mech = ClientScram::<Sha256>::from_credentials(creds.clone()).unwrap();
//! let mut server_mech = ServerScram::<Sha256, _>::new(MyValidator, ChannelBinding::Unsupported);
//!
//! assert_eq!(finish(&mut client_mech, &mut server_mech), Ok(Identity::Username(USERNAME.to_owned())));
//! }
//! ```
//!
//! # Usage
//!
//! You can use this in your crate by adding this under `dependencies` in your `Cargo.toml`:
//!
//! ```toml,ignore
//! sasl = "*"
//! ```
mod error;
pub mod client;
#[macro_use]
pub mod server;
pub mod common;
pub mod secret;
pub use crate::error::Error;

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#[cfg(feature = "scram")]
use crate::common::scram::DeriveError;
pub trait Secret {}
pub trait Pbkdf2Secret {
fn salt(&self) -> &[u8];
fn iterations(&self) -> u32;
fn digest(&self) -> &[u8];
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Plain(pub String);
impl Secret for Plain {}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Pbkdf2Sha1 {
pub salt: Vec<u8>,
pub iterations: u32,
pub digest: Vec<u8>,
}
impl Pbkdf2Sha1 {
#[cfg(feature = "scram")]
pub fn derive(password: &str, salt: &[u8], iterations: u32) -> Result<Pbkdf2Sha1, DeriveError> {
use crate::common::scram::{ScramProvider, Sha1};
use crate::common::Password;
let digest = Sha1::derive(&Password::Plain(password.to_owned()), salt, iterations)?;
Ok(Pbkdf2Sha1 {
salt: salt.to_vec(),
iterations: iterations,
digest: digest,
})
}
}
impl Secret for Pbkdf2Sha1 {}
impl Pbkdf2Secret for Pbkdf2Sha1 {
fn salt(&self) -> &[u8] {
&self.salt
}
fn iterations(&self) -> u32 {
self.iterations
}
fn digest(&self) -> &[u8] {
&self.digest
}
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Pbkdf2Sha256 {
pub salt: Vec<u8>,
pub iterations: u32,
pub digest: Vec<u8>,
}
impl Pbkdf2Sha256 {
#[cfg(feature = "scram")]
pub fn derive(
password: &str,
salt: &[u8],
iterations: u32,
) -> Result<Pbkdf2Sha256, DeriveError> {
use crate::common::scram::{ScramProvider, Sha256};
use crate::common::Password;
let digest = Sha256::derive(&Password::Plain(password.to_owned()), salt, iterations)?;
Ok(Pbkdf2Sha256 {
salt: salt.to_vec(),
iterations: iterations,
digest: digest,
})
}
}
impl Secret for Pbkdf2Sha256 {}
impl Pbkdf2Secret for Pbkdf2Sha256 {
fn salt(&self) -> &[u8] {
&self.salt
}
fn iterations(&self) -> u32 {
self.iterations
}
fn digest(&self) -> &[u8] {
&self.digest
}
}

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use crate::common::Identity;
use crate::server::{Mechanism, MechanismError, Response};
use getrandom::getrandom;
pub struct Anonymous;
impl Anonymous {
pub fn new() -> Anonymous {
Anonymous
}
}
impl Mechanism for Anonymous {
fn name(&self) -> &str {
"ANONYMOUS"
}
fn respond(&mut self, payload: &[u8]) -> Result<Response, MechanismError> {
if !payload.is_empty() {
return Err(MechanismError::FailedToDecodeMessage);
}
let mut rand = [0u8; 16];
getrandom(&mut rand)?;
let username = format!("{:02x?}", rand);
let ident = Identity::Username(username);
Ok(Response::Success(ident, Vec::new()))
}
}

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#[cfg(feature = "anonymous")]
mod anonymous;
mod plain;
#[cfg(feature = "scram")]
mod scram;
#[cfg(feature = "anonymous")]
pub use self::anonymous::Anonymous;
pub use self::plain::Plain;
#[cfg(feature = "scram")]
pub use self::scram::Scram;

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use crate::common::Identity;
use crate::secret;
use crate::server::{Mechanism, MechanismError, Response, Validator};
pub struct Plain<V: Validator<secret::Plain>> {
validator: V,
}
impl<V: Validator<secret::Plain>> Plain<V> {
pub fn new(validator: V) -> Plain<V> {
Plain {
validator: validator,
}
}
}
impl<V: Validator<secret::Plain>> Mechanism for Plain<V> {
fn name(&self) -> &str {
"PLAIN"
}
fn respond(&mut self, payload: &[u8]) -> Result<Response, MechanismError> {
let mut sp = payload.split(|&b| b == 0);
sp.next();
let username = sp
.next()
.ok_or_else(|| MechanismError::NoUsernameSpecified)?;
let username = String::from_utf8(username.to_vec())
.map_err(|_| MechanismError::ErrorDecodingUsername)?;
let password = sp
.next()
.ok_or_else(|| MechanismError::NoPasswordSpecified)?;
let password = String::from_utf8(password.to_vec())
.map_err(|_| MechanismError::ErrorDecodingPassword)?;
let ident = Identity::Username(username);
self.validator.validate(&ident, &secret::Plain(password))?;
Ok(Response::Success(ident, Vec::new()))
}
}

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use std::marker::PhantomData;
use base64;
use crate::common::scram::{generate_nonce, ScramProvider};
use crate::common::{parse_frame, xor, ChannelBinding, Identity};
use crate::secret;
use crate::secret::Pbkdf2Secret;
use crate::server::{Mechanism, MechanismError, Provider, Response};
enum ScramState {
Init,
SentChallenge {
initial_client_message: Vec<u8>,
initial_server_message: Vec<u8>,
gs2_header: Vec<u8>,
server_nonce: String,
identity: Identity,
salted_password: Vec<u8>,
},
Done,
}
pub struct Scram<S, P>
where
S: ScramProvider,
P: Provider<S::Secret>,
S::Secret: secret::Pbkdf2Secret,
{
name: String,
state: ScramState,
channel_binding: ChannelBinding,
provider: P,
_marker: PhantomData<S>,
}
impl<S, P> Scram<S, P>
where
S: ScramProvider,
P: Provider<S::Secret>,
S::Secret: secret::Pbkdf2Secret,
{
pub fn new(provider: P, channel_binding: ChannelBinding) -> Scram<S, P> {
Scram {
name: format!("SCRAM-{}", S::name()),
state: ScramState::Init,
channel_binding: channel_binding,
provider: provider,
_marker: PhantomData,
}
}
}
impl<S, P> Mechanism for Scram<S, P>
where
S: ScramProvider,
P: Provider<S::Secret>,
S::Secret: secret::Pbkdf2Secret,
{
fn name(&self) -> &str {
&self.name
}
fn respond(&mut self, payload: &[u8]) -> Result<Response, MechanismError> {
let next_state;
let ret;
match self.state {
ScramState::Init => {
// TODO: really ugly, mostly because parse_frame takes a &[u8] and i don't
// want to double validate utf-8
//
// NEED TO CHANGE THIS THOUGH. IT'S AWFUL.
let mut commas = 0;
let mut idx = 0;
for &b in payload {
idx += 1;
if b == 0x2C {
commas += 1;
if commas >= 2 {
break;
}
}
}
if commas < 2 {
return Err(MechanismError::FailedToDecodeMessage);
}
let gs2_header = payload[..idx].to_vec();
let rest = payload[idx..].to_vec();
// TODO: process gs2 header properly, not this ugly stuff
match self.channel_binding {
ChannelBinding::None | ChannelBinding::Unsupported => {
// Not supported.
if gs2_header[0] != 0x79 {
// ord("y")
return Err(MechanismError::ChannelBindingNotSupported);
}
}
ref other => {
// Supported.
if gs2_header[0] == 0x79 {
// ord("y")
return Err(MechanismError::ChannelBindingIsSupported);
} else if !other.supports("tls-unique") {
// TODO: grab the data
return Err(MechanismError::ChannelBindingMechanismIncorrect);
}
}
}
let frame =
parse_frame(&rest).map_err(|_| MechanismError::CannotDecodeInitialMessage)?;
let username = frame.get("n").ok_or_else(|| MechanismError::NoUsername)?;
let identity = Identity::Username(username.to_owned());
let client_nonce = frame.get("r").ok_or_else(|| MechanismError::NoNonce)?;
let mut server_nonce = String::new();
server_nonce += client_nonce;
server_nonce +=
&generate_nonce().map_err(|_| MechanismError::FailedToGenerateNonce)?;
let pbkdf2 = self.provider.provide(&identity)?;
let mut buf = Vec::new();
buf.extend(b"r=");
buf.extend(server_nonce.bytes());
buf.extend(b",s=");
buf.extend(base64::encode(pbkdf2.salt()).bytes());
buf.extend(b",i=");
buf.extend(pbkdf2.iterations().to_string().bytes());
ret = Response::Proceed(buf.clone());
next_state = ScramState::SentChallenge {
server_nonce: server_nonce,
identity: identity,
salted_password: pbkdf2.digest().to_vec(),
initial_client_message: rest,
initial_server_message: buf,
gs2_header: gs2_header,
};
}
ScramState::SentChallenge {
ref server_nonce,
ref identity,
ref salted_password,
ref gs2_header,
ref initial_client_message,
ref initial_server_message,
} => {
let frame =
parse_frame(payload).map_err(|_| MechanismError::CannotDecodeResponse)?;
let mut cb_data: Vec<u8> = Vec::new();
cb_data.extend(gs2_header);
cb_data.extend(self.channel_binding.data());
let mut client_final_message_bare = Vec::new();
client_final_message_bare.extend(b"c=");
client_final_message_bare.extend(base64::encode(&cb_data).bytes());
client_final_message_bare.extend(b",r=");
client_final_message_bare.extend(server_nonce.bytes());
let client_key = S::hmac(b"Client Key", &salted_password)?;
let server_key = S::hmac(b"Server Key", &salted_password)?;
let mut auth_message = Vec::new();
auth_message.extend(initial_client_message);
auth_message.extend(b",");
auth_message.extend(initial_server_message);
auth_message.extend(b",");
auth_message.extend(client_final_message_bare.clone());
let stored_key = S::hash(&client_key);
let client_signature = S::hmac(&auth_message, &stored_key)?;
let client_proof = xor(&client_key, &client_signature);
let sent_proof = frame.get("p").ok_or_else(|| MechanismError::NoProof)?;
let sent_proof =
base64::decode(sent_proof).map_err(|_| MechanismError::CannotDecodeProof)?;
if client_proof != sent_proof {
return Err(MechanismError::AuthenticationFailed);
}
let server_signature = S::hmac(&auth_message, &server_key)?;
let mut buf = Vec::new();
buf.extend(b"v=");
buf.extend(base64::encode(&server_signature).bytes());
ret = Response::Success(identity.clone(), buf);
next_state = ScramState::Done;
}
ScramState::Done => {
return Err(MechanismError::SaslSessionAlreadyOver);
}
}
self.state = next_state;
Ok(ret)
}
}

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use crate::common::Identity;
use crate::secret::Secret;
use std::fmt;
#[cfg(feature = "scram")]
use crate::common::scram::DeriveError;
#[macro_export]
macro_rules! impl_validator_using_provider {
( $validator:ty, $secret:ty ) => {
impl $crate::server::Validator<$secret> for $validator {
fn validate(
&self,
identity: &$crate::common::Identity,
value: &$secret,
) -> Result<(), $crate::server::ValidatorError> {
if &(self as &$crate::server::Provider<$secret>).provide(identity)? == value {
Ok(())
} else {
Err($crate::server::ValidatorError::AuthenticationFailed)
}
}
}
};
}
pub trait Provider<S: Secret>: Validator<S> {
fn provide(&self, identity: &Identity) -> Result<S, ProviderError>;
}
pub trait Validator<S: Secret> {
fn validate(&self, identity: &Identity, value: &S) -> Result<(), ValidatorError>;
}
#[derive(Debug, PartialEq)]
pub enum ProviderError {
AuthenticationFailed,
#[cfg(feature = "scram")]
DeriveError(DeriveError),
}
#[derive(Debug, PartialEq)]
pub enum ValidatorError {
AuthenticationFailed,
ProviderError(ProviderError),
}
#[derive(Debug, PartialEq)]
pub enum MechanismError {
NoUsernameSpecified,
ErrorDecodingUsername,
NoPasswordSpecified,
ErrorDecodingPassword,
ValidatorError(ValidatorError),
FailedToDecodeMessage,
ChannelBindingNotSupported,
ChannelBindingIsSupported,
ChannelBindingMechanismIncorrect,
CannotDecodeInitialMessage,
NoUsername,
NoNonce,
FailedToGenerateNonce,
ProviderError(ProviderError),
CannotDecodeResponse,
#[cfg(feature = "scram")]
InvalidKeyLength(hmac::digest::InvalidLength),
#[cfg(any(feature = "scram", feature = "anonymous"))]
RandomFailure(getrandom::Error),
NoProof,
CannotDecodeProof,
AuthenticationFailed,
SaslSessionAlreadyOver,
}
#[cfg(feature = "scram")]
impl From<DeriveError> for ProviderError {
fn from(err: DeriveError) -> ProviderError {
ProviderError::DeriveError(err)
}
}
impl From<ProviderError> for ValidatorError {
fn from(err: ProviderError) -> ValidatorError {
ValidatorError::ProviderError(err)
}
}
impl From<ProviderError> for MechanismError {
fn from(err: ProviderError) -> MechanismError {
MechanismError::ProviderError(err)
}
}
impl From<ValidatorError> for MechanismError {
fn from(err: ValidatorError) -> MechanismError {
MechanismError::ValidatorError(err)
}
}
#[cfg(feature = "scram")]
impl From<hmac::digest::InvalidLength> for MechanismError {
fn from(err: hmac::digest::InvalidLength) -> MechanismError {
MechanismError::InvalidKeyLength(err)
}
}
#[cfg(any(feature = "scram", feature = "anonymous"))]
impl From<getrandom::Error> for MechanismError {
fn from(err: getrandom::Error) -> MechanismError {
MechanismError::RandomFailure(err)
}
}
impl fmt::Display for ProviderError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "provider error")
}
}
impl fmt::Display for ValidatorError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "validator error")
}
}
impl fmt::Display for MechanismError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match self {
MechanismError::NoUsernameSpecified => write!(fmt, "no username specified"),
MechanismError::ErrorDecodingUsername => write!(fmt, "error decoding username"),
MechanismError::NoPasswordSpecified => write!(fmt, "no password specified"),
MechanismError::ErrorDecodingPassword => write!(fmt, "error decoding password"),
MechanismError::ValidatorError(err) => write!(fmt, "validator error: {}", err),
MechanismError::FailedToDecodeMessage => write!(fmt, "failed to decode message"),
MechanismError::ChannelBindingNotSupported => {
write!(fmt, "channel binding not supported")
}
MechanismError::ChannelBindingIsSupported => {
write!(fmt, "channel binding is supported")
}
MechanismError::ChannelBindingMechanismIncorrect => {
write!(fmt, "channel binding mechanism is incorrect")
}
MechanismError::CannotDecodeInitialMessage => {
write!(fmt, "can’t decode initial message")
}
MechanismError::NoUsername => write!(fmt, "no username"),
MechanismError::NoNonce => write!(fmt, "no nonce"),
MechanismError::FailedToGenerateNonce => write!(fmt, "failed to generate nonce"),
MechanismError::ProviderError(err) => write!(fmt, "provider error: {}", err),
MechanismError::CannotDecodeResponse => write!(fmt, "can’t decode response"),
#[cfg(feature = "scram")]
MechanismError::InvalidKeyLength(err) => write!(fmt, "invalid key length: {}", err),
#[cfg(any(feature = "scram", feature = "anonymous"))]
MechanismError::RandomFailure(err) => {
write!(fmt, "failure to get random data: {}", err)
}
MechanismError::NoProof => write!(fmt, "no proof"),
MechanismError::CannotDecodeProof => write!(fmt, "can’t decode proof"),
MechanismError::AuthenticationFailed => write!(fmt, "authentication failed"),
MechanismError::SaslSessionAlreadyOver => write!(fmt, "SASL session already over"),
}
}
}
impl Error for ProviderError {}
impl Error for ValidatorError {}
use std::error::Error;
impl Error for MechanismError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
MechanismError::ValidatorError(err) => Some(err),
MechanismError::ProviderError(err) => Some(err),
// TODO: figure out how to enable the std feature on this crate.
//MechanismError::InvalidKeyLength(err) => Some(err),
_ => None,
}
}
}
pub trait Mechanism {
fn name(&self) -> &str;
fn respond(&mut self, payload: &[u8]) -> Result<Response, MechanismError>;
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Response {
Success(Identity, Vec<u8>),
Proceed(Vec<u8>),
}
pub mod mechanisms;